Nineteenth Supplemental Indenture, dated November 8, 2024, between Marsh & McLennan Companies, Inc. and The Bank of New York Mellon, as trustee

NINETEENTH SUPPLEMENTAL INDENTURE, dated as of November 8, 2024, between MARSH & McLENNAN COMPANIES, INC., a Delaware corporation (the “Issuer”), and THE BANK OF NEW YORK MELLON, a New York banking corporation, as Trustee (the “Trustee”).

W I T N E S S E T H:

WHEREAS, the Issuer and the Trustee executed and delivered an Indenture, dated as of July 15, 2011 (the “Base Indenture” and, as supplemented hereby, the “Indenture”), to provide for the issuance by the Issuer from time to time of senior debt securities evidencing its unsecured indebtedness, to be issued in one or more series as provided in the Indenture;

WHEREAS, pursuant to a Board Resolution, the Issuer has authorized the issuance of a series of securities evidencing its senior indebtedness, consisting initially of $950,000,000 aggregate principal amount of 4.550% Senior Notes due 2027 (the “Original 2027 Notes” and, together with all the Additional 2027 Notes (as defined herein), if any, hereinafter referred to, the “2027 Notes”);

WHEREAS, pursuant to a Board Resolution, the Issuer has authorized the issuance of a series of securities evidencing its senior indebtedness, consisting initially of $1,000,000,000 aggregate principal amount of 4.650% Senior Notes due 2030 (the “Original 2030 Notes” and, together with all the Additional 2030 Notes (as defined herein), if any, hereinafter referred to, the “2030 Notes”);

WHEREAS, pursuant to a Board Resolution, the Issuer has authorized the issuance of a series of securities evidencing its senior indebtedness, consisting initially of $1,000,000,000 aggregate principal amount of 4.850% Senior Notes due 2031 (the “Original 2031 Notes” and, together with all the Additional 2031 Notes (as defined herein), if any, hereinafter referred to, the “2031 Notes”);

WHEREAS, pursuant to a Board Resolution, the Issuer has authorized the issuance of a series of securities evidencing its senior indebtedness, consisting initially of $2,000,000,000 aggregate principal amount of 5.000% Senior Notes due 2035 (the “Original 2035 Notes” and, together with all the Additional 2035 Notes (as defined herein), if any, hereinafter referred to, the “2035 Notes”);

WHEREAS, pursuant to a Board Resolution, the Issuer has authorized the issuance of a series of securities evidencing its senior indebtedness, consisting initially of $500,000,000 aggregate principal amount of 5.350% Senior Notes due 2044 (the “Original 2044 Notes” and, together with all the Additional 2044 Notes (as defined herein), if any, hereinafter referred to, the “2044 Notes”);

WHEREAS, pursuant to a Board Resolution, the Issuer has authorized the issuance of a series of securities evidencing its senior indebtedness, consisting initially of $1,500,000,000 aggregate principal amount of 5.400% Senior Notes due 2055 (the “Original 2055 Notes” and, together with all the Additional 2055 Notes (as defined herein), if any, hereinafter referred to, the “2055 Notes”);

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WHEREAS, pursuant to a Board Resolution, the Issuer has authorized the issuance of a series of securities evidencing its senior indebtedness, consisting initially of $300,000,000 aggregate principal amount of the Floating Rate Senior Notes due 2027 (the “Original Floating Rate Notes” and, together with all the Additional Floating Rate Notes (as defined herein), if any, hereinafter referred to, the “Floating Rate Notes”). The 2027 Notes, the 2030 Notes, the 2031 Notes, the 2035 Notes, the 2044 Notes and the 2055 Notes are hereinafter referred to as the “Fixed Rate Notes”. The Fixed Rate Notes and the Floating Rate Notes are hereinafter referred to as the “Notes”. The Original 2027 Notes, the Original 2030 Notes, the Original 2031 Notes, the Original 2035 Notes, the Original 2044 Notes, the Original 2055 Notes, and the Original Floating Rate Notes are hereinafter referred to as the “Original Notes”;

WHEREAS, the entry into this Nineteenth Supplemental Indenture by the parties hereto is in all respects authorized by the provisions of the Indenture;

WHEREAS, the Issuer desires to establish the respective terms of the Notes of each series in accordance with Section 2.01 of the Indenture and to establish the respective forms of the Notes of each series in accordance with Section 2.02 of the Indenture; and

WHEREAS, all acts and requirements necessary to make this Nineteenth Supplemental Indenture a valid and legally binding indenture and agreement according to its terms have been done.

NOW, THEREFORE, for and in consideration of the premises, the Issuer and the Trustee mutually covenant and agree for the equal and proportionate benefit of the respective holders from time to time of the Notes as follows:

ARTICLE 1

Section 1.01. Terms of Notes. The following terms relating to the Notes are hereby established:

(a) The 2027 Notes shall constitute a series of securities having the title “4.550% Senior Notes due 2027”. The 2030 Notes shall constitute a series of securities having the title “4.650% Senior Notes due 2030”. The 2031 Notes shall constitute a series of securities having the title “4.850% Senior Notes due 2031”. The 2035 Notes shall constitute a series of securities having the title “5.000% Senior Notes due 2035”. The 2044 Notes shall constitute a series of securities having the title “5.350% Senior Notes due 2044”. The 2055 Notes shall constitute a series of securities having the title “5.400% Senior Notes due 2055”. The Floating Rate Notes shall constitute a series of securities having the title “Floating Rate Senior Notes due 2027”.

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(b) The aggregate principal amount of the Original 2027 Notes that may be authenticated and delivered under the Indenture (except for 2027 Notes authenticated and delivered upon registration of, transfer of, or in exchange for, or in lieu of, other 2027 Notes pursuant to Sections 2.05, 2.06, 2.07 or 9.04 of the Base Indenture) shall be up to $950,000,000. The aggregate principal amount of the Original 2030 Notes that may be authenticated and delivered under the Indenture (except for 2030 Notes authenticated and delivered upon registration of, transfer of, or in exchange for, or in lieu of, other 2030 Notes pursuant to Sections 2.05, 2.06, 2.07 or 9.04 of the Base Indenture) shall be up to $1,000,000,000. The aggregate principal amount of the Original 2031 Notes that may be authenticated and delivered under the Indenture (except for 2031 Notes authenticated and delivered upon registration of, transfer of, or in exchange for, or in lieu of, other 2031 Notes pursuant to Sections 2.05, 2.06, 2.07 or 9.04 of the Base Indenture) shall be up to $1,000,000,000. The aggregate principal amount of the Original 2035 Notes that may be authenticated and delivered under the Indenture (except for 2035 Notes authenticated and delivered upon registration of, transfer of, or in exchange for, or in lieu of, other 2035 Notes pursuant to Sections 2.05, 2.06, 2.07 or 9.04 of the Base Indenture) shall be up to $2,000,000,000. The aggregate principal amount of the Original 2044 Notes that may be authenticated and delivered under the Indenture (except for 2044 Notes authenticated and delivered upon registration of, transfer of, or in exchange for, or in lieu of, other 2044 Notes pursuant to Sections 2.05, 2.06, 2.07 or 9.04 of the Base Indenture) shall be up to $500,000,000. The aggregate principal amount of the Original 2055 Notes that may be authenticated and delivered under the Indenture (except for 2055 Notes authenticated and delivered upon registration of, transfer of, or in exchange for, or in lieu of, other 2055 Notes pursuant to Sections 2.05, 2.06, 2.07 or 9.04 of the Base Indenture) shall be up to $1,500,000,000. The aggregate principal amount of the Original Floating Rate Notes that may be authenticated and delivered under the Indenture (except for Floating Rate Notes authenticated and delivered upon registration of, transfer of, or in exchange for, or in lieu of, other Floating Rate Notes pursuant to Sections 2.05, 2.06, 2.07 or 9.04 of the Base Indenture) shall be up to $300,000,000.

(c) The entire outstanding principal of the 2027 Notes shall be payable on November 8, 2027, plus any unpaid interest accrued to such date. The entire outstanding principal of the 2030 Notes shall be payable on March 15, 2030, plus any unpaid interest accrued to such date. The entire outstanding principal of the 2031 Notes shall be payable on November 15, 2031, plus any unpaid interest accrued to such date. The entire outstanding principal of the 2035 Notes shall be payable on March 15, 2035, plus any unpaid interest accrued to such date. The entire outstanding principal of the 2044 Notes shall be payable on November 15, 2044, plus any unpaid interest accrued to such date. The entire outstanding principal of the 2055 Notes shall be payable on March 15, 2055, plus any unpaid interest accrued to such date. The entire outstanding principal of the Floating Rate Notes shall be payable on November 8, 2027, plus any unpaid interest accrued to such date.

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(d) The rate at which the 2027 Notes shall bear interest shall be 4.550% per annum; the date from which interest shall accrue on the 2027 Notes shall be November 8, 2024, or from the most recent Interest Payment Date to which interest has been paid; the Interest Payment Dates for the 2027 Notes on which interest will be payable shall be May 8 and November 8 in each year, beginning May 8, 2025; the regular record dates for the interest payable on the 2027 Notes on any Interest Payment Date shall be the April 23 and October 24 immediately preceding the applicable Interest Payment Date; and the basis upon which interest on the 2027 Notes shall be calculated shall be that of a 360-day year consisting of twelve 30-day months.

(e) The rate at which the 2030 Notes shall bear interest shall be 4.650% per annum; the date from which interest shall accrue on the 2030 Notes shall be November 8, 2024, or from the most recent Interest Payment Date to which interest has been paid; the Interest Payment Dates for the 2030 Notes on which interest will be payable shall be March 15 and September 15 in each year, beginning March 15, 2025; the regular record dates for the interest payable on the 2030 Notes on any Interest Payment Date shall be the February 28 (or, in the case of a leap year, February 29) and August 31 immediately preceding the applicable Interest Payment Date; and the basis upon which interest on the 2030 Notes shall be calculated shall be that of a 360-day year consisting of twelve 30-day months.

(f) The rate at which the 2031 Notes shall bear interest shall be 4.850% per annum; the date from which interest shall accrue on the 2031 Notes shall be November 8, 2024, or from the most recent Interest Payment Date to which interest has been paid; the Interest Payment Dates for the 2031 Notes on which interest will be payable shall be May 15 and November 15 in each year, beginning May 15, 2025; the regular record dates for the interest payable on the 2031 Notes on any Interest Payment Date shall be the April 30 and October 31 immediately preceding the applicable Interest Payment Date; and the basis upon which interest on the 2031 Notes shall be calculated shall be that of a 360-day year consisting of twelve 30-day months.

(g) The rate at which the 2035 Notes shall bear interest shall be 5.000% per annum; the date from which interest shall accrue on the 2035 Notes shall be November 8, 2024, or from the most recent Interest Payment Date to which interest has been paid; the Interest Payment Dates for the 2035 Notes on which interest will be payable shall be March 15 and September 15 in each year, beginning March 15, 2025; the regular record dates for the interest payable on the 2035 Notes on any Interest Payment Date shall be the February 28 (or, in the case of a leap year, February 29) and August 31 immediately preceding the applicable Interest Payment Date; and the basis upon which interest on the 2035 Notes shall be calculated shall be that of a 360-day year consisting of twelve 30-day months.

(h) The rate at which the 2044 Notes shall bear interest shall be 5.350% per annum; the date from which interest shall accrue on the 2044 Notes shall be November 8, 2024, or from the most recent Interest Payment Date to which interest has been paid; the Interest Payment Dates for the 2044 Notes on which interest will be payable shall be May 15 and November 15 in each year, beginning May 15, 2025; the regular record dates for the interest payable on the 2044 Notes on any Interest Payment Date shall be the April 30 and October 31 immediately preceding the applicable Interest Payment Date; and the basis upon which interest on the 2044 Notes shall be calculated shall be that of a 360-day year consisting of twelve 30-day months.

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(i) The rate at which the 2055 Notes shall bear interest shall be 5.400% per annum; the date from which interest shall accrue on the 2055 Notes shall be November 8, 2024, or from the most recent Interest Payment Date to which interest has been paid; the Interest Payment Dates for the 2055 Notes on which interest will be payable shall be March 15 and September 15 in each year, beginning March 15, 2025; the regular record dates for the interest payable on the 2055 Notes on any Interest Payment Date shall be the February 28 (or, in the case of a leap year, February 29) and August 31 immediately preceding the applicable Interest Payment Date; and the basis upon which interest on the 2055 Notes shall be calculated shall be that of a 360-day year consisting of twelve 30-day months.

(j) The rate at which the Floating Rate Notes shall bear interest shall be at a floating rate, reset quarterly, equal to Compounded SOFR, plus 0.700%; the date from which interest shall accrue on the Floating Rate Notes shall be November 8, 2024, or from the most recent date to which interest on such Floating Rate Note has been paid or duly provided for, until the principal amount of the Floating Rate Note is paid or duly made available for payment; interest on the Floating Rate Notes will be payable quarterly in arrears on February 8, May 8, August 8 and November 8 of each year, beginning on February 8, 2025, and at maturity (each a “Floating Rate Interest Payment Date”); the regular record dates for the interest payable on the Floating Rate Notes on any Floating Rate Interest Payment Date shall be the January 24, April 23, July 24 and October 24 immediately preceding the applicable Floating Rate Interest Payment Date; if the February 8, May 8, August 8 or November 8 of any year is not a Business Day, then the next succeeding Business Day will be the applicable Floating Rate Interest Payment Date and interest on the Floating Rate Notes will be paid on such next succeeding Business Day (unless such next succeeding Business Day falls in the succeeding calendar month, in which case the applicable Floating Rate Interest Payment Date shall be the Business Day immediately preceding such February 8, May 8, August 8 or November 8, and interest on the Floating Rate Notes shall be paid on such immediately preceding Business Day); if the stated maturity date of the Floating Rate Notes is not a Business Day, the payment of principal of, and interest on, the Floating Rate Notes shall be made on the next succeeding Business day, and no interest will accrue for the period from and after the stated maturity date; and the basis upon which interest on the Floating Rate Notes shall be calculated shall be that of the actual number of calendar days elapsed over a 360-day year.

The interest rate for the Initial Interest Period shall be Compounded SOFR as determined on November 6, 2024, plus 0.700%. Thereafter, the interest rate for any Interest Period will be Compounded SOFR, as determined on the applicable date that is the second U.S. Government Securities Business Day preceding such Floating Rate Interest Payment Date (the “Interest Determination Date”), plus a margin of 0.700%.

The amount of interest accrued and payable on the Floating Rate Notes for each Interest Period will be equal to the product of (i) the outstanding principal amount of the Floating Rate Notes multiplied by (ii) the product of (a) the interest rate for the relevant Interest Period multiplied by (b) the quotient of the actual number of calendar days in such Interest Period divided by 360.

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The Calculation Agent shall calculate the interest rate in accordance with the foregoing. The Calculation Agent’s determination of any interest rate and its calculation of the amount of interest for any Floating Rate Interest Period will be final and binding in the absence of manifest error. All percentages resulting from any calculation are to be rounded to the nearest one hundred-thousandth of a percentage point, with five one-millionths of a percentage point rounded upward. Dollar amounts used in the calculation are to be rounded to the nearest cent (with one-half cent being rounded upward).

“Calculation Agent” shall initially mean The Bank of New York Mellon, or any successor appointed from time to time by the Company, acting as Calculation Agent.

“Compounded SOFR” means, with respect to any Interest Period, the rate computed in accordance with the following formula set forth below:

where:

“SOFR Index_Start” is the SOFR Index value for the day that is two U.S. Government Securities Business Days preceding the first date of the relevant Interest Period;

“SOFR Index_End” is the SOFR Index value for the day that is two U.S. Government Securities Business Days preceding the Latter Floating Rate Interest Payment Date relating to such Interest Period; and

“d_c” is the actual number of calendar days from (and including) SOFR Index_Start to (but excluding) SOFR Index_End (the actual number of calendar days in the applicable Observation Period).

“Initial Interest Period” means the period from and including the date of this Nineteenth Supplemental Indenture to, but excluding, the first Floating Rate Interest Payment Date.

“Interest Period” means, after the Initial Interest Period, the period from and including a Floating Rate Interest Payment Date to, but excluding, the immediately succeeding Floating Rate Interest Payment Date (such succeeding Floating Rate Interest Payment Date, the “Latter Floating Rate Interest Payment Date”); provided that the final interest period for the Floating Rate Notes will be the period from and including the Floating Rate Interest Payment Date immediately preceding the stated maturity date of the Floating Rate Notes to, but excluding, the maturity date.

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“New York Federal Reserve” means the Federal Reserve Bank of New York (or a successor administrator of the Secured Overnight Financing Rate).

“New York Federal Reserve’s Website” means the website of the New York Federal Reserve, currently at http://www.newyorkfed.org, or any successor source.

“Observation Period” means, in respect of each Interest Period, the period from and including the day that is two U.S. Government Securities Business Days preceding the first date of such relevant Interest Period to but excluding the day that is two U.S. Government Securities Business Days preceding the Latter Floating Rate Interest Payment Date for such Interest Period; provided that the first Observation Period shall be the period from and including the day that is two U.S. Government Securities Business Days preceding the date of this Nineteenth Supplemental Indenture to, but excluding, the day that is the two U.S. Government Securities Business Days preceding the first Floating Rate Interest Payment Date.

“Secured Overnight Financing Rate” means the daily secured overnight financing rate as provided by the New York Federal Reserve on the New York Federal Reserve’s Website.

“SOFR Index” means, with respect to any U.S. Government Securities Business Day:

(1) the SOFR Index value as published by the New York Federal Reserve as such index appears on the New York Federal Reserve’s Website at 3:00 p.m. (New York time) on such U.S. Government Securities Business Day (the “SOFR Determination Time”); provided that:

(2) if a SOFR Index value does not so appear as specified in clause (1) above at the SOFR Determination Time, then:

(i) if a Benchmark Transition Event and its related Benchmark Replacement Date (each as defined herein) have not occurred with respect to SOFR, then Compounded SOFR shall be the rate determined pursuant to the “SOFR Index Unavailable” provisions described below; or

(ii) if a Benchmark Transition Event and its related Benchmark Replacement Date have occurred with respect to SOFR, then Compounded SOFR shall be the rate determined pursuant to the “Effect of a Benchmark Transition Event” provisions described below.

“U.S. Government Securities Business Day” means any day except for a Saturday, Sunday or a day on which the Securities Industry and Financial Markets Association recommends that the fixed income departments of its members be closed for the entire day for purposes of trading in U.S. government securities.

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(k) If a SOFR Index_Start or SOFR Index_End is not published on the associated Interest Determination Date and a Benchmark Transition Event and its related Benchmark Replacement Date have not occurred with respect to the Secured Overnight Financing Rate, “Compounded SOFR” means, for the applicable Interest Period for which such index is not available, the rate of return on a daily compounded interest investment calculated in accordance with the formula for SOFR Averages, and definitions required for such formula, published on the New York Federal Reserve’s Website at https://www.newyorkfed.org/markets/treasury-repo-reference-rates-information. For the purposes of this provision, references in the SOFR Averages compounding formula and related definitions to “calculation period” shall be replaced with “Observation Period” and the words “that is, 30-, 90-, or 180- calendar days” shall be removed. If the daily Secured Overnight Financing Rate (“SOFR_i”) does not so appear for any day, “_i” in the Observation Period, SOFR_i for such day “_i” shall be SOFR published in respect of the first preceding U.S. Government Securities Business Day for which the Secured Overnight Financing Rate was published on the New York Federal Reserve’s Website.

If the Issuer or its designee determine on or prior to the relevant Reference Time that a Benchmark Transition Event and its related Benchmark Replacement Date have occurred with respect to the then-current Benchmark, the Benchmark Replacement shall replace the then-current Benchmark for all purposes relating to the Floating Rate Notes in respect of all determinations on such date and for all determinations on all subsequent dates.

In connection with the implementation of a Benchmark Replacement, the Issuer or its designee shall have the right to make Benchmark Replacement Conforming Changes from time to time.

Any determination, decision or election that may be made by the Issuer or its designee pursuant to this Section 1.01(k), including a determination with respect to a tenor, rate or adjustment or of the occurrence or non-occurrence of an event, circumstance or date and any decision to take or refrain from taking any action or any selection:

(1) will be conclusive and binding absent manifest error;

(2) will be made in the Issuer’s or its designee’s sole discretion (and in no event shall the Calculation Agent be responsible for making any such determination, decision or election); and

(3) notwithstanding anything to the contrary in the documentation relating to the Floating Rate Notes, shall become effective without consent from the holders of the Floating Rate Notes or any other party.

For the avoidance of doubt, if the event that gives rise to the Benchmark Replacement Date occurs on the same day as, but earlier than, the Reference Time in respect of any determination, the Benchmark Replacement Date will be deemed to have occurred prior to the Reference Time for such determination.

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For the avoidance of doubt, for purposes of the definitions of Benchmark Replacement Date and Benchmark Transition Event, references to Benchmark also include any reference rate underlying such Benchmark.

“Benchmark” means, initially, Compounded SOFR, as such term is defined above; provided that if the Issuer or its designee determines on or prior to the Reference Time that a Benchmark Transition Event and its related Benchmark Replacement Date have occurred with respect to Compounded SOFR (or the published daily SOFR Index used in the calculation thereof) or the then-current Benchmark, then “Benchmark” means the applicable Benchmark Replacement.

“Benchmark Replacement” means the first alternative set forth in the order below that can be determined by the Issuer or its designee as of the Benchmark Replacement Date:

(1) the sum of (a) the alternate rate of interest that has been selected or recommended by the Relevant Governmental Body as the replacement for the then-current Benchmark and (b) the Benchmark Replacement Adjustment;

(2) the sum of (a) the ISDA Fallback Rate and (b) the Benchmark Replacement Adjustment; or

(3) the sum of (a) the alternate rate of interest that has been selected by the Issuer or its designee as the replacement for the then-current Benchmark giving due consideration to any industry-accepted rate of interest as a replacement for the then-current Benchmark for U.S. dollar-denominated floating rate notes at such time and (b) the Benchmark Replacement Adjustment.

“Benchmark Replacement Adjustment” means the first alternative set forth in the order below that can be determined by the Issuer or its designee as of the Benchmark Replacement Date:

(1) the spread adjustment, or method for calculating or determining such spread adjustment (which may be a positive or negative value or zero), that has been selected or recommended by the Relevant Governmental Body for the applicable Unadjusted Benchmark Replacement;

(2) if the applicable Unadjusted Benchmark Replacement is equivalent to the ISDA Fallback Rate, the ISDA Fallback Adjustment; or

(3) the spread adjustment (which may be a positive or negative value or zero) that has been selected by the Issuer or its designee giving due consideration to any industry-accepted spread adjustment, or method for calculating or determining such spread adjustment, for the replacement of the then-current Benchmark with the applicable Unadjusted Benchmark Replacement for U.S. dollar-denominated floating rate notes at such time.

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“Benchmark Replacement Conforming Changes” means, with respect to any Benchmark Replacement, any technical, administrative or operational changes (including changes to the definition of the Interest Period, timing and frequency of determining rates and making payments of interest, rounding of amounts or tenors and other administrative matters) that the Issuer or its designee decides may be appropriate to reflect the adoption of such Benchmark Replacement in a manner substantially consistent with market practice (or, if the Issuer or its designee decides that adoption of any portion of such market practice is not administratively feasible or if the Issuer or its designee determines that no market practice for use of the Benchmark Replacement exists, in such other manner as the Issuer or its designee determines is reasonably necessary).

“Benchmark Replacement Date” means the earliest to occur of the following events with respect to the then-current Benchmark (including the daily published component used in the calculation thereof):

(1) in the case of clause (1) or (2) of the definition of “Benchmark Transition Event,” the later of (a) the date of the public statement or publication of information referenced therein and (b) the date on which the administrator of the Benchmark permanently or indefinitely ceases to provide the Benchmark (or such component); or

(2) in the case of clause (3) of the definition of “Benchmark Transition Event,” the date of the public statement or publication of information referenced therein.

“Benchmark Transition Event” means the occurrence of one or more of the following events with respect to the then-current Benchmark (including the daily published component used in the calculation thereof):

(1) a public statement or publication of information by or on behalf of the administrator of the Benchmark (or such component) announcing that such administrator has ceased or will cease to provide the Benchmark (or such component), permanently or indefinitely; provided that, at the time of such statement or publication, there is no successor administrator that will continue to provide the Benchmark (or such component);

(2) a public statement or publication of information by the regulatory supervisor for the administrator of the Benchmark (or such component), the central bank for the currency of the Benchmark (or such component), an insolvency official with jurisdiction over the administrator for the Benchmark (or such component), a resolution authority with jurisdiction over the administrator for the Benchmark (or such component) or a court or an entity with similar insolvency or resolution authority over the administrator for the Benchmark, which states that the administrator of the Benchmark (or such component) has ceased or will cease to provide the Benchmark (or such component) permanently or indefinitely; provided that, at the time of such statement or publication, there is no successor administrator that will continue to provide the Benchmark (or such component); or

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(3) a public statement or publication of information by the regulatory supervisor for the administrator of the Benchmark announcing that the Benchmark is no longer representative.

“ISDA Definitions” means the 2006 ISDA Definitions published by the International Swaps and Derivatives Association, Inc. or any successor thereto, as amended or supplemented from time to time, or any successor definitional booklet for interest rate derivatives published from time to time.

“ISDA Fallback Adjustment” means the spread adjustment (which may be a positive or negative value or zero) that would apply for derivatives transactions referencing the ISDA Definitions to be determined upon the occurrence of an index cessation event with respect to the Benchmark for the applicable tenor.

“ISDA Fallback Rate” means the rate that would apply for derivatives transactions referencing the ISDA Definitions to be effective upon the occurrence of an index cessation date with respect to the Benchmark for the applicable tenor excluding the applicable ISDA Fallback Adjustment.

“Reference Time” with respect to any determination of the Benchmark means (1) if the Benchmark is Compounded SOFR, the SOFR Determination Time, and (2) if the Benchmark is not Compounded SOFR, the time determined by the Issuer or its designee after giving effect to the Benchmark Replacement Conforming Changes.

“Relevant Governmental Body” means the Federal Reserve Board and/or the Federal Reserve Bank of New York, or a committee officially endorsed or convened by the Federal Reserve Board and/or the Federal Reserve Bank of New York or any successor thereto.

“Unadjusted Benchmark Replacement” means the Benchmark Replacement excluding the Benchmark Replacement Adjustment.

(l) So long as Compounded SOFR is required to be determined with respect to the Floating Rate Notes, there will at all times be a Calculation Agent. In the event that any then-acting Calculation Agent shall be unable or unwilling to act, or that such Calculation Agent shall fail duly to establish the Compounded SOFR for any Interest Period, or that the Company proposes to remove such Calculation Agent, the Company shall appoint the Company or another person which is a bank, trust company, investment banking firm or other financial institution to act as the Calculation Agent.

Neither the Trustee nor the Calculation Agent shall be under any obligation (1) to monitor, determine or verify the unavailability or cessation of Compounded SOFR (or any other Benchmark), or whether or when there has occurred, or to give notice to any other transaction party of the occurrence of, any Benchmark Transition Event or related Benchmark Replacement Date, (2) to select, determine or designate any Benchmark Replacement, or other successor or replacement benchmark index, or whether any conditions to the designation of such a rate or

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index have been satisfied, (3) to select, determine or designate any Benchmark Replacement Adjustment, or other modifier to any replacement or successor index, or (4) to determine whether or what Benchmark Replacement Conforming Changes are necessary or advisable, if any, in connection with any of the foregoing, including, but not limited to, adjustments as to any alternative spread thereon, the business day convention, interest determination dates or any other relevant methodology applicable to such substitute or successor benchmark. In connection with the foregoing, each of the Trustee and the Calculation Agent shall be entitled to conclusively rely on any determinations made by the Issuer or its designee without independent investigation, and neither will have any liability for actions taken at the Issuer’s direction in connection therewith.

Neither the Trustee nor the Calculation Agent shall be liable for any inability, failure or delay on its part to perform any of its duties set forth in this Nineteenth Supplemental Indenture as a result of the unavailability of Compounded SOFR or other applicable Benchmark Replacement, including as a result of any failure, inability, delay, error or inaccuracy on the part of any other transaction party in providing any direction, instruction, notice or information required or contemplated by the terms of this Nineteenth Supplemental Indenture and reasonably required for the performance of such duties. Neither the Trustee nor the Calculation Agent shall be responsible or liable for the Issuer’s actions or omissions or for those of its designee, or for any failure or delay in the performance by such designee, nor shall either the Trustee or the Calculation Agent be under any obligation to oversee or monitor the Issuer’s performance or that of such designee.

The Issuer shall give the Trustee and the Calculation Agent written notice of the person appointed as its designee.

(m) Prior to the Applicable Par Call Date, the Issuer may redeem one or more series of the Fixed Rate Notes at its option, in whole or in part, at any time and from time to time, at a redemption price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of:

(1) (a) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the redemption date (assuming the Notes of such series matured on the Applicable Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus the Applicable Spread, in each case, less (b) interest accrued to the date of redemption, and

(2) 100% of the principal amount of the Notes of such series to be redeemed,

plus, in either case, accrued and unpaid interest thereon to the redemption date.

On or after the Applicable Par Call Date, the Issuer may redeem one or more series of the Fixed Rate Notes, in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the Notes of such series being redeemed plus accrued and unpaid interest thereon to the redemption date.

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The Floating Rate Notes are not subject to optional redemption prior to maturity (other than as a result of a special mandatory redemption pursuant to Section 1.1(o) hereto).

“Applicable Par Call Date” means (i) with respect to the 2027 Notes, October 8, 2027 (one month prior to the maturity date of such Notes), (ii) with respect to the 2030 Notes, February 15, 2030 (one month prior to the maturity date of such Notes), (iii) with respect to the 2031 Notes, September 15, 2031 (two months prior to the maturity date of such Notes), (iv) with respect to the 2035 Notes, December 15, 2034 (three months prior to the maturity date of such Notes), (v) with respect to the 2044 Notes, May 15, 2044 (six months prior to the maturity date of such Notes) and (vi) with respect to the 2055 Notes, September 15, 2054 (six months prior to the maturity date of such Notes).

“Applicable Spread” means (i) with respect to the 2027 Notes, 10 basis points, (ii) with respect to the 2030 Notes, 10 basis points, (iii) with respect to the 2031 Notes, 10 basis points, (iv) with respect to the 2035 Notes, 15 basis points, (v) with respect to the 2044 Notes, 15 basis points and (vi) with respect to the 2055 Notes, 15 basis points.

“Treasury Rate” means, with respect to any redemption date, the yield determined by the Issuer in accordance with the following two paragraphs.

The Treasury Rate shall be determined by the Issuer after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third Business Day preceding the redemption date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated as “Selected Interest Rates (Daily)—H.15” (or any successor designation or publication) (“H.15”) under the caption “U.S. government securities–Treasury constant maturities–Nominal” (or any successor caption or heading) (“H.15 TCM”). In determining the Treasury Rate, the Issuer shall select, as applicable: (1) the yield for the Treasury constant maturity on H.15 exactly equal to the period from the redemption date to the Applicable Par Call Date (the “Remaining Life”); or (2) if there is no such Treasury constant maturity on H.15 exactly equal to the Remaining Life, the two yields – one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one yield corresponding to the Treasury constant maturity on H.15 immediately longer than the Remaining Life – and shall interpolate to the Applicable Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal places; or (3) if there is no such Treasury constant maturity on H.15 shorter than or longer than the Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to the Remaining Life. For purposes of this paragraph, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal to the relevant number of months or years, as applicable, of such Treasury constant maturity from the redemption date.

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If on the third Business Day preceding the redemption date H.15 TCM or any successor designation or publication is no longer published, the Issuer shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second Business Day preceding such redemption date of the United States Treasury security maturing on, or with a maturity that is closest to, the Applicable Par Call Date, as applicable. If there is no United States Treasury security maturing on the Applicable Par Call Date but there are two or more United States Treasury securities with a maturity date equally distant from the Applicable Par Call Date, one with a maturity date preceding the Applicable Par Call Date and one with a maturity date following the Applicable Par Call Date, the Issuer shall select the United States Treasury security with a maturity date preceding the Applicable Par Call Date. If there are two or more United States Treasury securities maturing on the Applicable Par Call Date or two or more United States Treasury securities meeting the criteria of the preceding sentence, the Issuer shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places.

The Issuer’s actions and determinations in determining the redemption price shall be conclusive and binding for all purposes, absent manifest error.

Notice of any redemption of Notes of such series may, at the Issuer’s discretion, be given subject to one or more conditions precedent, including, but not limited to, completion of a corporate transaction that is pending. In such event, the related notice of redemption will describe each such condition and, if applicable, will state that, at the Issuer’s discretion, the redemption date may be delayed until such time (including more than 60 days after the notice of redemption was given) as any or all such conditions are satisfied (or waived by the Issuer in its sole discretion), or such redemption may not occur and such notice may be rescinded in the event that any or all such conditions have not been satisfied (or waived by the Issuer in its sole discretion) by the redemption date, or by the redemption date as so delayed. If any such redemption has been rescinded or delayed, the Issuer will provide written notice to the Trustee prior to the close of business two Business Days before the redemption date and, upon receipt, the Trustee will provide such notice to each registered holder.

In the case of a partial redemption of Notes of such series, selection of the Notes for redemption will be made by the Trustee by lot. No Notes of a principal amount of $2,000 or less will be redeemed in part. If any Note of such series is to be redeemed in part only, the notice of redemption that relates to the Note will state the portion of the principal amount of the Note to be redeemed. A new Note in a principal amount equal to the unredeemed portion of the Note will be issued in the name of the holder of the Note upon surrender for cancellation of the original Note. For so long as the Notes are held by the Depositary, the redemption of the Notes shall be done in accordance with the policies and procedures of the Depositary.

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Unless the Issuer defaults in payment of the redemption price, on and after the redemption date interest will cease to accrue on the Notes or portions thereof called for redemption.

Subject to Section 2.11 of the Base Indenture, the Issuer shall not be required (i) to issue, register the transfer of or exchange any Notes of such series during a period beginning at the opening of business 15 days before the day of the delivery of a notice of redemption of the Notes selected for redemption and ending at the close of business on the day of such delivery, or (ii) to register the transfer of or exchange any Notes so selected for redemption in whole or in part, except the unredeemed portion of any such Notes being redeemed in part.

(n) In case the Issuer shall desire to exercise its right to redeem all or, as the case may be, a portion of one or more series of the Fixed Rate Notes in accordance with Section 1.01(m) above, the Issuer shall, or shall cause the Trustee to, give notice of such redemption to holders of such series of Notes to be redeemed. Notice of any redemption will be mailed or electronically delivered (or otherwise transmitted in accordance with the Depositary’s procedures) at least 10 days but not more than 60 days before the redemption date to each holder of such Notes to be redeemed. Any notice that is delivered in the manner herein provided shall be conclusively presumed to have been duly given, whether or not the registered holder received the notice. In any case, failure duly to give such notice to the holder of any Note designated for redemption in whole or in part, or any defect in the notice, shall not affect the validity of the proceedings for the redemption of any other Note.

Each such notice of redemption shall specify the series and amount of Notes to be redeemed, the date fixed for redemption and the applicable redemption price at which the Notes to be redeemed are to be redeemed, and shall state that payment of the redemption price of such Notes to be redeemed will be made at the office or agency of the Issuer in the Borough of Manhattan, the City and State of New York, upon presentation and surrender of such Notes, that interest accrued to the date fixed for redemption will be paid as specified in said notice and, that from and after said date interest will cease to accrue.

If the Trustee is to provide notice on behalf of the Issuer to the holders of any series of Fixed Rate Notes in accordance with this Section 1.01(n), for a partial or full redemption, the Issuer shall give the Trustee at least 3 days’ notice in advance, a period which can be reduced upon further negotiation between the Issuer and the Trustee, of the date fixed for redemption as to the aggregate principal amount of Notes of such series to be redeemed.

The Issuer may, if and whenever it shall so elect, by delivery of instructions signed on its behalf by its President or any Vice President, notify the Trustee that the Issuer has elected to call all or any part of a series of Notes for redemption and instruct the Trustee to give notice of redemption in the manner set forth in this Section, such notice to be in the name of the Issuer.

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(o) If (A) the Transaction is not completed by the parties to the Merger Agreement on or prior to the later of (x) September 29, 2025 or (y) the date that is five Business Days after any later date to which the parties to the Merger Agreement may agree to extend the “Outside Date” in the Merger Agreement, (B) the Merger Agreement is terminated or (C) the Issuer notifies the Trustee, in writing, that it will not pursue the consummation of the Transaction (each, a “Special Mandatory Redemption Event”), then the Issuer shall redeem all of the 2027 Notes, the 2030 Notes, the 2031 Notes, the 2035 Notes, the 2044 Notes and the Floating Rate Notes (collectively, the “Special Mandatory Redemption Notes”) on the Special Mandatory Redemption Date (as defined herein at a special mandatory redemption price equal to 101% of the aggregate principal amount of the Special Mandatory Redemption Notes to be redeemed, plus accrued and unpaid interest from and including the date of initial issuance, or the most recent date to which interest has been paid, whichever is later, to but not including the Special Mandatory Redemption Date (the “Special Mandatory Redemption Price”).

Upon the occurrence of a Special Mandatory Redemption Event, promptly, but in no event more than five Business Days, following such Special Mandatory Redemption Event, the Issuer shall deliver written notice to the Trustee of such special mandatory redemption and the date upon which such Special Mandatory Redemption Notes will be redeemed, which shall be no earlier than the fifth Business Day following the date of such notice (the “Special Mandatory Redemption Date”), together with a notice of Special Mandatory Redemption, which shall be delivered in the name and at the expense of the Issuer. The Trustee shall promptly mail, or electronically deliver, the Special Mandatory Redemption Notice, according to the procedures of The Depository Trust Company, to each registered holder of Special Mandatory Redemption Notes to be redeemed at such holder’s registered address.

If funds sufficient to pay the Special Mandatory Redemption Price of all of the Special Mandatory Redemption Notes to be redeemed on the Special Mandatory Redemption Date are deposited with a Paying Agent or the Trustee on or before such Special Mandatory Redemption Date, then on and after such Special Mandatory Redemption Date, the Special Mandatory Redemption Notes shall cease to bear interest and, other than the right to receive the Special Mandatory Redemption Price, all rights under such Special Mandatory Redemption Notes shall terminate.

Notwithstanding anything to the contrary, the Merger Agreement may be amended and the form of the Transaction may be modified at any time, in each case, without the consent of any holder of the Special Mandatory Redemption Notes.

“Merger Agreement” means that certain Agreement and Plan of Merger, dated as of September 29, 2024, by and among Marsh & McLennan Agency LLC, an indirect wholly-owned subsidiary of the Issuer, BD Merger Sub, Inc., TIH Blocker II, Inc. and TIH Platform Midco, L.P.

“Special Mandatory Redemption Notice” means a notice to registered holders of the Special Mandatory Redemption Notes that such Notes shall be redeemed and specifying the Special Mandatory Redemption Date and such other information as required, to the extent applicable, by the Base Indenture.

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“Transaction” means the Issuer’s pending acquisition of TIH Blocker II, Inc., the parent company of McGriff Insurance Services, LLC.

(p) The Notes shall be issuable in denominations equal to two thousand U.S. dollars ($2,000) or integral multiples of $1,000 in excess thereof.

(q) The Trustee shall also be the security registrar and paying agent for the Notes.

(r) Payments of the principal of and interest on the Notes shall be made in U.S. dollars, and the Notes shall be denominated in U.S. dollars.

(s) The holders of the Notes shall have no special rights in addition to those provided in the Indenture upon the occurrence of any particular events.

(t) The Notes shall not be subordinated to any other debt of the Issuer, and shall constitute senior unsecured obligations of the Issuer.

(u) The Notes of each series shall be issued as a Global Security and The Depository Trust Company, New York, New York shall be the initial Depositary. The Notes are not convertible into shares of common stock or other securities of the Issuer.

Section 1.02. Form of Note. The form of the 2027 Notes is attached hereto as Exhibit A. The form of the 2030 Notes is attached hereto as Exhibit B. The form of the 2031 Notes is attached hereto as Exhibit C. The form of the 2035 Notes is attached hereto as Exhibit D. The form of the 2044 Notes is attached hereto as Exhibit E. The form of the 2055 Notes is attached hereto as Exhibit F. The form of the Floating Rate Notes is attached hereto as Exhibit G.

Section 1.03. Additional Notes. Subject to the terms and conditions contained herein, the Issuer may issue additional notes of any series (such additional notes of the 2027 Notes, the “Additional 2027 Notes,” of the series of 2030 Notes, the “Additional 2030 Notes,” of the series of 2031 Notes, the “Additional 2031 Notes,” of the series of 2035 Notes, the “Additional 2035 Notes,” of the series of 2044 Notes, the “Additional 2044 Notes,” of the series of 2055 Notes, the “Additional 2055 Notes,” and of the series of Floating Rate Notes, the “Additional Floating Rate Notes”, and collectively, the “Additional Notes”) having the same ranking and the same interest rate, maturity and other terms as the Original Notes of such series (except as otherwise described in the form of the Notes of such series), without the consent of the holders of the Original Notes of such series then Outstanding. Any such Additional Notes of any series will be a part of the series having the same terms as the Original Notes of such series, provided that, if any additional notes subsequently issued are not fungible for U.S. federal income tax purposes with any notes of such series previously issued, such additional notes shall trade under a separate CUSIP. The aggregate principal amount of the Additional Notes of any series, if any, shall be unlimited. The Original Notes and the Additional Notes, if any, of any series shall constitute one series for all purposes under this Nineteenth Supplemental Indenture, including, without limitation, amendments, waivers and redemptions.

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Section 1.04. Amendment of Section 6.01(a)(i) of the Base Indenture. Solely for the purposes of each series of the Notes, respectively, Section 6.01(a)(i) of the Base Indenture is hereby amended by replacing that section in its entirety with the following:

“the Company defaults in the payment of any installment of interest on the Notes (as defined in this Nineteenth Supplemental Indenture) of such series, as and when the same shall become due and payable, and continuance of such default for a period of 30 days; provided, however, that a valid extension of an interest payment period by the Company in accordance with the terms of any indenture supplemental hereto, shall not constitute a default in the payment of interest for this purpose.”

ARTICLE 2

MISCELLANEOUS

Section 2.01. Definitions. Capitalized terms used but not defined in this Nineteenth Supplemental Indenture shall have the meanings ascribed thereto in the Indenture.

Section 2.02. Confirmation of Indenture. The Indenture, as heretofore supplemented and amended and as further supplemented and amended by this Nineteenth Supplemental Indenture, is in all respects ratified and confirmed, and the Indenture, this Nineteenth Supplemental Indenture and all indentures supplemental thereto shall be read, taken and construed as one and the same instrument.

Section 2.03. Concerning the Trustee. The Trustee assumes no duties, responsibilities or liabilities by reason of this Nineteenth Supplemental Indenture other than as set forth in the Indenture and, in carrying out its responsibilities hereunder, shall have all of the rights, protections and immunities which it possesses under the Indenture. The Trustee makes no representations as to the validity or sufficiency of this Nineteenth Supplemental Indenture. The recitals herein are deemed to be those of the Issuer and not of the Trustee.

Section 2.04. Governing Law. This Nineteenth Supplemental Indenture, the Indenture and the Notes shall be governed by and construed in accordance with the law of the State of New York.

Section 2.05. Separability. In case any provision in this Nineteenth Supplemental Indenture shall for any reason be held to be invalid, illegal or unenforceable, the validity, legality and enforceability of the remaining provisions shall not in any way be affected or impaired thereby.

Section 2.06. Counterparts. This Nineteenth Supplemental Indenture may be executed in any number of counterparts each of which shall be an original, but such counterparts shall together constitute but one and the same instrument. Exchange of signature pages to this Nineteenth Supplemental Indenture and the Notes by electronic transmission shall constitute effective execution and delivery of this Nineteenth Supplemental Indenture and the Notes.

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IN WITNESS WHEREOF, this Nineteenth Supplemental Indenture has been duly executed by the Issuer and the Trustee as of the day and year first written above.

Attest:

[Signature Page to the Nineteenth Supplemental Indenture]

[Signature Page to the Nineteenth Supplemental Indenture]

Exhibit A

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR SECURITIES IN DEFINITIVE FORM IN ACCORDANCE WITH THE PROVISIONS OF THE INDENTURE AND THE TERMS OF THE SECURITIES AND EXCEPT AS OTHERWISE PROVIDED IN SECTION 2.11 OF THE BASE INDENTURE, THIS NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY DTC TO A NOMINEE OF DTC OR BY A NOMINEE OF DTC TO DTC OR ANOTHER NOMINEE OF DTC OR BY DTC OR ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITARY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITARY.

A-1

MARSH & McLENNAN COMPANIES, INC.

4.550% Senior Notes due 2027

MARSH & McLENNAN COMPANIES, INC., a Delaware corporation (the “Issuer”, which term includes any successor corporation under the Indenture hereinafter referred to), for value received, hereby promises to pay to Cede & Co., or its registered assigns, the principal sum of [__________________] MILLION DOLLARS ($[__________]) (which aggregate principal amount may from time to time be increased or decreased to such other aggregate principal amounts by adjustments made on the Schedule of Increases or Decreases in Global Security attached hereto) on November 8, 2027 and to pay interest on said principal sum from November 8, 2024, or from the most recent interest payment date (each such date, an “Interest Payment Date”) to which interest has been paid or duly provided for semiannually on May 8 and November 8 of each year commencing May 8, 2025 at the rate of 4.550% per annum until the principal hereof shall have become due and payable, and on any overdue principal and premium, if any, and (without duplication and to the extent that payment of such interest is enforceable under applicable law) on any overdue installment of interest at the same rate per annum. The amount of interest payable on any Interest Payment Date shall be computed on the basis of a 360-day year of twelve 30-day months. In the event that any date on which interest is payable on this Note is not a Business Day, then payment of interest payable on such date will be made on the next succeeding day which is a Business Day (and without any interest or other payment in respect of any such delay). The interest installment so payable, and punctually paid or duly provided for, on any Interest Payment Date will, as provided in the Indenture (hereafter defined), be paid to the person in whose name this Note (or one or more Predecessor Securities, as defined in said Indenture) is registered at the close of business on the regular record date for such interest installment which shall be the April 23 and October 24 preceding such Interest Payment Date. Any such interest installment not punctually paid or duly provided for (as defined in the Indenture, the “Defaulted Interest”) shall forthwith cease to be payable to the registered holders on such regular record date, and may be paid to the person in whose name this Note (or one or more Predecessor Securities) is registered at the close of business on a special record date to be fixed by the Trustee for the payment of such Defaulted Interest, which shall not be more than 15 nor less than 10 days prior to the date of the proposed payment, and not less than 10 days after the receipt by the Trustee of the notice of the proposed payment or at any time in any other lawful manner not inconsistent with the requirements of any securities exchange on which the Notes may be listed, and upon such notice as may be required by such exchange, all as more fully provided in the Indenture. The principal of (and premium, if any) and the interest on this Note shall be payable at the office or agency of the Trustee maintained for that purpose in any coin or currency of the United States of America which at the time of payment is legal tender for payment of public and private debts; provided, however, that payment of interest may be made at

A-2

the option of the Issuer by check mailed to the registered holder at such address as shall appear in the Security Register. Notwithstanding the foregoing, so long as the registered holder of this Note is Cede & Co., the payment of the principal of (and premium, if any) and interest on this Note will be made at such place and to such account as may be designated by DTC.

The indebtedness evidenced by this Note is, to the extent provided in the Indenture, senior and unsecured and will rank in right of payment on parity with all other senior unsecured obligations of the Issuer.

This Note shall not be entitled to any benefit under the Indenture hereinafter referred to or be valid until the Certificate of Authentication hereon shall have been signed manually by or on behalf of the Trustee.

The provisions of this Note are continued on the reverse side hereof and such continued provisions shall for all purposes have the same effect as though fully set forth at this place.

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IN WITNESS WHEREOF, the Issuer has caused this instrument to be executed.

Dated:

[Signature Page to Global Note]

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CERTIFICATE OF AUTHENTICATION

This is one of the Notes of the series of Notes described in the within-mentioned Indenture.

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ASSIGNMENT FORM

FOR VALUE RECEIVED, the undersigned hereby

sells, assigns and transfers to

(Insert Social Security number or other identifying number of assignee)

(Please print or typewrite name and address, including zip code of assignee)

the within Note of Marsh & McLennan Companies, Inc. and hereby does irrevocably constitute and appoint

Attorney to transfer said Note on the books of the within-named Issuer with full power of substitution in the premises.

Signature(s) must be guaranteed by an eligible Guarantor Institution (banks, stock brokers, savings and loan associations and credit unions) with membership in an approved signature guarantee medallion program pursuant to Securities and Exchange Commission Rule 17Ad-15.

NOTICE: The signature to this assignment must correspond with the name as it appears on the first page of the within Note in every particular, without alteration or enlargement or any change whatever.

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SCHEDULE OF INCREASES OR DECREASES IN GLOBAL SECURITY

MARSH & McLENNAN COMPANIES, INC.

4.550% Senior Notes due 2027

The initial aggregate principal amount of this Global Security is $[_____________]. The following increases or decreases in this Global Security have been made:

No: ________

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MARSH & McLENNAN COMPANIES, INC.

4.550% Senior Notes due 2027

This Note is one of a duly authorized series of Securities (referred to in the Base Indenture (hereafter defined)), of the Issuer (herein sometimes referred to as the “Notes”), all such Securities issued or to be issued in one or more series under and pursuant to an indenture (the “Base Indenture”), dated as of July 15, 2011, between the Issuer and The Bank of New York Mellon, as Trustee (the “Trustee”), as supplemented in the case of the Notes by the Nineteenth Supplemental Indenture, dated as of November 8, 2024, between the Issuer and the Trustee (the Base Indenture, as so supplemented, the “Indenture”), to which Indenture and all indentures supplemental thereto reference is hereby made for a description of the rights, limitations of rights, obligations, duties and immunities thereunder of the Trustee, the Issuer and the holders of the Notes. This series of Notes is initially limited in aggregate principal amount as specified in said Nineteenth Supplemental Indenture. This series of Notes and any Additional Notes of this series shall constitute one series for all purposes under the Indenture, including without limitation, amendments, waivers and redemptions. The terms and conditions of this series of Notes and any Additional Notes of this series (other than the issue price, the date of issuance, the payment of interest accruing prior to the issue date of the Additional Notes and the first payment of interest following such issue date) shall be the same and shall bear the same CUSIP number.

Prior to October 8, 2027 (the “Par Call Date”), the Issuer may redeem the Notes, at its option, in whole or in part, at any time and from time to time, at a redemption price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of:

(1) (a) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the redemption date (assuming the Notes matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 10 basis points, less (b) interest accrued to the date of redemption, and

(2) 100% of the principal amount of the Notes to be redeemed,

plus, in either case, accrued and unpaid interest thereon to the redemption date.

On or after the Par Call Date, the Issuer may redeem the Notes, in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the Notes being redeemed plus accrued and unpaid interest thereon to the redemption date.

“Treasury Rate” means, with respect to any redemption date, the yield determined by the Issuer in accordance with the following two paragraphs.

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The Treasury Rate shall be determined by the Issuer after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third Business Day preceding the redemption date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated as “Selected Interest Rates (Daily)—H.15” (or any successor designation or publication) (“H.15”) under the caption “U.S. government securities–Treasury constant maturities–Nominal” (or any successor caption or heading) (“H.15 TCM”). In determining the Treasury Rate, the Issuer shall select, as applicable: (1) the yield for the Treasury constant maturity on H.15 exactly equal to the period from the redemption date to the Par Call Date (the “Remaining Life”); or (2) if there is no such Treasury constant maturity on H.15 exactly equal to the Remaining Life, the two yields – one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one yield corresponding to the Treasury constant maturity on H.15 immediately longer than the Remaining Life – and shall interpolate to the Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal places; or (3) if there is no such Treasury constant maturity on H.15 shorter than or longer than the Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to the Remaining Life. For purposes of this paragraph, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal to the relevant number of months or years, as applicable, of such Treasury constant maturity from the redemption date.

If on the third Business Day preceding the redemption date H.15 TCM or any successor designation or publication is no longer published, the Issuer shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second Business Day preceding such redemption date of the United States Treasury security maturing on, or with a maturity that is closest to, the Par Call Date, as applicable. If there is no United States Treasury security maturing on the Par Call Date but there are two or more United States Treasury securities with a maturity date equally distant from the Par Call Date one with a maturity date preceding the Par Call Date and one with a maturity date following the Par Call Date, the Issuer shall select the United States Treasury security with a maturity date preceding the Par Call Date. If there are two or more United States Treasury securities maturing on the Par Call Date or two or more United States Treasury securities meeting the criteria of the preceding sentence, the Issuer shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places.

The Issuer’s actions and determinations in determining the redemption price shall be conclusive and binding for all purposes, absent manifest error.

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Notice of any redemption of Notes may, at the Issuer’s discretion, be given subject to one or more conditions precedent, including, but not limited to, completion of a corporate transaction that is pending. In such event, the related notice of redemption will describe each such condition and, if applicable, will state that, at the Issuer’s discretion, the redemption date may be delayed until such time (including more than 60 days after the notice of redemption was given) as any or all such conditions are satisfied (or waived by the Issuer in its sole discretion), or such redemption may not occur and such notice may be rescinded in the event that any or all such conditions have not been satisfied (or waived by the Issuer in its sole discretion) by the redemption date, or by the redemption date as so delayed. If any such redemption has been rescinded or delayed, the Issuer will provide written notice to the Trustee prior to the close of business two Business Days before the redemption date and, upon receipt, the Trustee will provide such notice to each registered holder.

In the case of a partial redemption, selection of the Notes for redemption will be made by the Trustee by lot. No Notes of a principal amount of $2,000 or less will be redeemed in part. If any Note is to be redeemed in part only, the notice of redemption that relates to the Note will state the portion of the principal amount of the Note to be redeemed. A new Note in a principal amount equal to the unredeemed portion of the Note will be issued in the name of the holder of the Note upon surrender for cancellation of the original Note. For so long as the Notes are held by the Depositary, the redemption of the Notes shall be done in accordance with the policies and procedures of the Depositary.

Unless the Issuer defaults in payment of the redemption price, on and after the redemption date interest will cease to accrue on the Notes or portions thereof called for redemption.

In case the Issuer shall desire to exercise its right to redeem all or, as the case may be, a portion of the Notes, the Issuer shall, or shall cause the Trustee to, give notice of such redemption to holders of the Notes to be redeemed. Notice of any redemption will be mailed or electronically delivered (or otherwise transmitted in accordance with the Depositary’s procedures) at least 10 days but not more than 60 days before the redemption date to each holder of Notes to be redeemed. Any notice that is delivered in the manner herein provided shall be conclusively presumed to have been duly given, whether or not the registered holder received the notice. In any case, failure duly to give such notice to the holder of any Note designated for redemption in whole or in part, or any defect in the notice, shall not affect the validity of the proceedings for the redemption of any other Note.

Each such notice of redemption shall specify the amount of Notes to be redeemed, the date fixed for redemption and the applicable redemption price at which the Notes to be redeemed are to be redeemed, and shall state that payment of the redemption price of such Notes to be redeemed will be made at the office or agency of the Issuer in the Borough of Manhattan, the City and State of New York, upon presentation and surrender of such Notes, that interest accrued to the date fixed for redemption will be paid as specified in said notice and, that from and after said date interest will cease to accrue.

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If the Trustee is to provide notice on behalf of the Issuer to the holders of the Notes as described herein, for a partial or full redemption, the Issuer shall give the Trustee at least 3 days’ notice in advance, a period which can be reduced upon further negotiation between the Issuer and the Trustee, of the date fixed for redemption as to the aggregate principal amount of Notes to be redeemed.

The Issuer may, if and whenever it shall so elect, by delivery of instructions signed on its behalf by its President or any Vice President, notify the Trustee that the Issuer has elected to call all or any part of the Notes for redemption and instruct the Trustee to give notice of redemption in the manner set forth in this Note, such notice to be in the name of the Issuer.

Subject to Section 2.11 of the Base Indenture, the Issuer shall not be required (i) to issue, register the transfer of or exchange any Notes during a period beginning at the opening of business 15 days before the day of the delivery of a notice of redemption of the Notes selected for redemption and ending at the close of business on the day of such delivery, or (ii) to register the transfer of or exchange any Notes so selected for redemption in whole or in part, except the unredeemed portion of any such Notes being redeemed in part.

If (A) the Issuer’s pending acquisition of TIH Blocker II, Inc., the parent company of McGriff Insurance Services, LLC (the “Transaction”) is not completed by the parties to that certain Agreement and Plan of Merger, dated as of September 29, 2024, by and among Marsh & McLennan Agency LLC, an indirect wholly-owned subsidiary of the Issuer, BD Merger Sub, Inc., TIH Blocker II, Inc. and TIH Platform Midco, L.P. (the “Merger Agreement”), on or prior to the later of (x) September 29, 2025 or (y) the date that is five Business Days after any later date to which the parties to the Merger Agreement may agree to extend the “Outside Date” in the Merger Agreement, (B) the Merger Agreement is terminated or (C) the Issuer notifies the Trustee, in writing, that it will not pursue the consummation of the Transaction (each, a “Special Mandatory Redemption Event”), then the Issuer shall redeem all of the Notes on the Special Mandatory Redemption Date at a special mandatory redemption price equal to 101% of the aggregate principal amount of the Notes to be redeemed, plus accrued and unpaid interest from and including the date of initial issuance, or the most recent date to which interest has been paid, whichever is later, to but not including the Special Mandatory Redemption Date (the “Special Mandatory Redemption Price”).

Upon the occurrence of a Special Mandatory Redemption Event, promptly, but in no event more than five Business Days, following such Special Mandatory Redemption Event, the Issuer shall deliver written notice to the Trustee of such special mandatory redemption and the date upon which such Special Mandatory Redemption Notes will be redeemed, which shall be no earlier than the fifth Business Day following the date of such notice (the “Special Mandatory Redemption Date”), and a notice to registered holders of the Notes that such Notes shall be redeemed and specifying the Special Mandatory Redemption Date and such other information as required, to the extent applicable, by the Base Indenture (the “Special Mandatory Redemption Notice”), which shall be delivered in the name and at the expense of the Issuer. The Trustee shall promptly mail or electronically deliver the Special Mandatory Redemption Notice, according to the procedures of The Depository Trust Company, to each registered holder of Notes to be redeemed at such holder’s registered address.

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If funds sufficient to pay the Special Mandatory Redemption Price of all of the Notes to be redeemed on the Special Mandatory Redemption Date are deposited with a Paying Agent or the Trustee on or before such Special Mandatory Redemption Date, then on and after such Special Mandatory Redemption Date, the Notes shall cease to bear interest and, other than the right to receive the Special Mandatory Redemption Price, all rights under the Notes shall terminate.

The Indenture contains provisions permitting the Issuer and the Trustee, with the consent of the holders of not less than a majority in aggregate principal amount of the Notes of all of the series at the time Outstanding affected thereby (all such series voting together as a single class), as defined in the Indenture, to execute supplemental indentures for the purpose of adding any provisions to or changing in any manner or eliminating any of the provisions of the Base Indenture or of any supplemental indenture or of modifying in any manner the rights of the holders of the Notes; provided, however, that no such supplemental indenture shall, without the consent of the holders of each Security then Outstanding and affected thereby (i) extend the fixed maturity of any Securities, including the Notes, or reduce the principal amount thereof, or reduce the rate or extend the time of payment of interest thereon, or reduce any premium payable upon the redemption thereof, or (ii) reduce the aforesaid percentage of Securities, the holders of which are required to consent to any such supplemental indenture. The Indenture also contains provisions permitting the holders of a majority in aggregate principal amount of the Notes of all series at the time Outstanding affected thereby (all such series voting together as a single class), to waive any past default in the performance of any of the covenants contained in the Base Indenture, or established pursuant to the Base Indenture with respect to such series, and its consequences, except a default in the payment of the principal of or premium, if any, or interest on any Securities, including the Notes, in which case, each such affected series voting as a separate class. Any such consent or waiver by the registered holder of this Note (unless revoked as provided in the Base Indenture) shall be conclusive and binding upon such holder and upon all future holders and owners of this Note and of any Note issued in exchange herefor or in place hereof (whether by registration of transfer or otherwise), irrespective of whether or not any notation of such consent or waiver is made upon this Note.

No reference herein to the Indenture and no provision of this Note or of the Indenture shall alter or impair the obligation of the Issuer, which is absolute and unconditional, to pay the principal of and premium, if any, and interest on this Note at the time and place and at the rate and in the money herein prescribed.

The Issuer is subject to certain covenants contained in the Indenture with respect to, and for the benefit of the holders of, the Notes. The Trustee shall not be obligated to monitor or confirm, on a continuing basis or otherwise, the Issuer’s compliance with the covenants contained in the Indenture or with respect to reports or other certificates filed under the Indenture; provided, however, that nothing herein shall relieve the Trustee of any obligations to monitor the Issuer’s timely delivery of all reports and certificates required under Section 5.03 of the Base Indenture and to fulfill its obligations under Article VII of the Indenture. If an Event of Default as defined in the Indenture with respect to the Notes shall occur and be continuing, the principal of the Notes may be declared due and payable in the manner and with the effect provided in the Indenture.

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As provided in and subject to the provisions of the Indenture, the holder of this Note shall not have the right to institute any proceeding with respect to the Indenture or for the appointment of a receiver or Trustee or for any other remedy thereunder, unless such holder shall have previously given the Trustee written notice of a continuing Event of Default with respect to the Notes, the holders of not less than 25% in principal amount of the Outstanding Notes (in the case of an Event of Default described in clauses (a)(i) or (a)(ii) of Section 6.01 of the Base Indenture, each such series voting as a separate class, and in the case of an Event of Default described in clauses (a)(iii), (a)(iv), (a)(v) or (a)(vi) of Section 6.01 of the Base Indenture, all affected series voting together as a single class) shall have made written request to the Trustee to institute proceedings in respect of such Event of Default as Trustee and offered the Trustee reasonable indemnity and the Trustee shall have failed to institute any such proceeding for 60 days after receipt of such notice, request and offer of indemnity and the Trustee shall not have received from the holders of a majority in principal amount of the Notes at the time Outstanding (voting as provided in Section 6.04(b) of the Base Indenture) a direction inconsistent with such request. The foregoing shall not apply to any suit instituted by the holder of this Note for the enforcement of any payment of principal hereof or any interest on or after the respective due dates expressed herein.

As provided in the Indenture and subject to certain limitations therein set forth, this Note is transferable by the registered holder hereof on the Security Register of the Issuer, upon surrender of this Note for registration of transfer at the office or agency of the Issuer in the Borough of Manhattan, the City and State of New York accompanied by a written instrument or instruments of transfer in form satisfactory to the Issuer or the Trustee duly executed by the registered holder hereof or his attorney duly authorized in writing, and thereupon one or more new Notes of authorized denominations and for the same aggregate principal amount and series will be issued to the designated transferee or transferees. No service charge will be made for any such transfer, but the Issuer may require payment of a sum sufficient to cover any tax or other governmental charge payable in relation thereto.

Prior to due presentment for registration of transfer of this Note, the Issuer, the Trustee, any paying agent and any Security Registrar may deem and treat the registered holder hereof as the absolute owner hereof (whether or not this Note shall be overdue and notwithstanding any notice of ownership or writing hereon made by anyone other than the Security Registrar) for the purpose of receiving payment of or on account of the principal hereof and premium, if any, and interest due hereon and for all other purposes, and neither the Issuer nor the Trustee nor any paying agent nor any Note Registrar shall be affected by any notice to the contrary.

No recourse shall be had for the payment of the principal of or the interest on this Note, or for any claim based hereon, or otherwise in respect hereof, or based on or in respect of the Indenture, against any incorporator, stockholder, officer or director, past, present or future, as such, of the Issuer or of any predecessor or successor corporation, whether by virtue of any constitution, statute or rule of law, or by the enforcement of any assessment or penalty or otherwise, all such liability being, by the acceptance hereof and as part of the consideration for the issuance hereof, expressly waived and released.

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The Notes are issuable only in registered form without coupons in authorized denominations. As provided in the Indenture and subject to certain limitations herein and therein set forth, Notes so issued are exchangeable for a like aggregate principal amount of Notes of a different authorized denomination, as requested by the holder surrendering the same.

All terms used in this Note which are defined in the Indenture shall have the meanings assigned to them in the Indenture.

THE INDENTURE AND THE NOTES INCLUDING THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK.

Pursuant to a recommendation promulgated by the Committee on Uniform Security Identification Procedures, the Issuer has caused “CUSIP” numbers to be printed on the Notes as a convenience to the holders of the Notes. No representation is made as to the correctness or accuracy of such CUSIP numbers as printed on the Notes, and reliance may be placed only on the other identification numbers printed hereon.

Unless the certificate of authentication hereon has been executed by or on behalf of the Trustee by manual signature, which may be delivered via electronic transmission, this Note shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purposes.

A-14

Exhibit B

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR SECURITIES IN DEFINITIVE FORM IN ACCORDANCE WITH THE PROVISIONS OF THE INDENTURE AND THE TERMS OF THE SECURITIES AND EXCEPT AS OTHERWISE PROVIDED IN SECTION 2.11 OF THE BASE INDENTURE, THIS NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY DTC TO A NOMINEE OF DTC OR BY A NOMINEE OF DTC TO DTC OR ANOTHER NOMINEE OF DTC OR BY DTC OR ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITARY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITARY.

B-1

MARSH & McLENNAN COMPANIES, INC.

4.650% Senior Notes due 2030

MARSH & McLENNAN COMPANIES, INC., a Delaware corporation (the “Issuer”, which term includes any successor corporation under the Indenture hereinafter referred to), for value received, hereby promises to pay to Cede & Co., or its registered assigns, the principal sum of [__________________] MILLION DOLLARS ($[__________]) (which aggregate principal amount may from time to time be increased or decreased to such other aggregate principal amounts by adjustments made on the Schedule of Increases or Decreases in Global Security attached hereto) on March 15, 2030 and to pay interest on said principal sum from November 8, 2024, or from the most recent interest payment date (each such date, an “Interest Payment Date”) to which interest has been paid or duly provided for semiannually on March 15 and September 15 of each year commencing March 15, 2025 at the rate of 4.650% per annum until the principal hereof shall have become due and payable, and on any overdue principal and premium, if any, and (without duplication and to the extent that payment of such interest is enforceable under applicable law) on any overdue installment of interest at the same rate per annum. The amount of interest payable on any Interest Payment Date shall be computed on the basis of a 360-day year of twelve 30-day months. In the event that any date on which interest is payable on this Note is not a Business Day, then payment of interest payable on such date will be made on the next succeeding day which is a Business Day (and without any interest or other payment in respect of any such delay). The interest installment so payable, and punctually paid or duly provided for, on any Interest Payment Date will, as provided in the Indenture (hereafter defined), be paid to the person in whose name this Note (or one or more Predecessor Securities, as defined in said Indenture) is registered at the close of business on the regular record date for such interest installment which shall be the February 28 (or, in the case of a leap year, February 29) and August 31 preceding such Interest Payment Date. Any such interest installment not punctually paid or duly provided for (as defined in the Indenture, the “Defaulted Interest”) shall forthwith cease to be payable to the registered holders on such regular record date, and may be paid to the person in whose name this Note (or one or more Predecessor Securities) is registered at the close of business on a special record date to be fixed by the Trustee for the payment of such Defaulted Interest, which shall not be more than 15 nor less than 10 days prior to the date of the proposed payment, and not less than 10 days after the receipt by the Trustee of the notice of the proposed payment or at any time in any other lawful manner not inconsistent with the requirements of any securities exchange on which the Notes may be listed, and upon such notice as may be required by such exchange, all as more fully provided in the Indenture. The principal of (and premium, if any) and the interest on this Note shall be payable at the office or agency of the Trustee maintained for that purpose in any coin or currency of the United States of America which at the time of payment is legal tender for payment of public and private debts; provided,

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however, that payment of interest may be made at the option of the Issuer by check mailed to the registered holder at such address as shall appear in the Security Register. Notwithstanding the foregoing, so long as the registered holder of this Note is Cede & Co., the payment of the principal of (and premium, if any) and interest on this Note will be made at such place and to such account as may be designated by DTC.

The indebtedness evidenced by this Note is, to the extent provided in the Indenture, senior and unsecured and will rank in right of payment on parity with all other senior unsecured obligations of the Issuer.

This Note shall not be entitled to any benefit under the Indenture hereinafter referred to or be valid until the Certificate of Authentication hereon shall have been signed manually by or on behalf of the Trustee.

The provisions of this Note are continued on the reverse side hereof and such continued provisions shall for all purposes have the same effect as though fully set forth at this place.

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IN WITNESS WHEREOF, the Issuer has caused this instrument to be executed.

Dated:

[Signature Page to Global Note]

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CERTIFICATE OF AUTHENTICATION

This is one of the Notes of the series of Notes described in the within-mentioned Indenture.

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ASSIGNMENT FORM

FOR VALUE RECEIVED, the undersigned hereby

sells, assigns and transfers to

(Insert Social Security number or other identifying number of assignee)

(Please print or typewrite name and address, including zip code of assignee)

the within Note of Marsh & McLennan Companies, Inc. and hereby does irrevocably constitute and appoint

Attorney to transfer said Note on the books of the within-named Issuer with full power of substitution in the premises.

Signature(s) must be guaranteed by an eligible Guarantor Institution (banks, stock brokers, savings and loan associations and credit unions) with membership in an approved signature guarantee medallion program pursuant to Securities and Exchange Commission Rule 17Ad-15.

NOTICE: The signature to this assignment must correspond with the name as it appears on the first page of the within Note in every particular, without alteration or enlargement or any change whatever.

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SCHEDULE OF INCREASES OR DECREASES IN GLOBAL SECURITY

MARSH & McLENNAN COMPANIES, INC.

4.650% Senior Notes due 2030

The initial aggregate principal amount of this Global Security is $[_____________]. The following increases or decreases in this Global Security have been made:

No: _____

B-7

MARSH & McLENNAN COMPANIES, INC.

4.650% Senior Notes due 2030

This Note is one of a duly authorized series of Securities (referred to in the Base Indenture (hereafter defined)), of the Issuer (herein sometimes referred to as the “Notes”), all such Securities issued or to be issued in one or more series under and pursuant to an indenture (the “Base Indenture”), dated as of July 15, 2011, between the Issuer and The Bank of New York Mellon, as Trustee (the “Trustee”), as supplemented in the case of the Notes by the Nineteenth Supplemental Indenture, dated as of November 8, 2024, between the Issuer and the Trustee (the Base Indenture, as so supplemented, the “Indenture”), to which Indenture and all indentures supplemental thereto reference is hereby made for a description of the rights, limitations of rights, obligations, duties and immunities thereunder of the Trustee, the Issuer and the holders of the Notes. This series of Notes is initially limited in aggregate principal amount as specified in said Nineteenth Supplemental Indenture. This series of Notes and any Additional Notes of this series shall constitute one series for all purposes under the Indenture, including without limitation, amendments, waivers and redemptions. The terms and conditions of this series of Notes and any Additional Notes of this series (other than the issue price, the date of issuance, the payment of interest accruing prior to the issue date of the Additional Notes and the first payment of interest following such issue date) shall be the same and shall bear the same CUSIP number.

Prior to February 15, 2030 (the “Par Call Date”), the Issuer may redeem the Notes, at its option, in whole or in part, at any time and from time to time, at a redemption price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of:

(1) (a) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the redemption date (assuming the Notes matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 10 basis points, less (b) interest accrued to the date of redemption, and

(2) 100% of the principal amount of the Notes to be redeemed,

plus, in either case, accrued and unpaid interest thereon to the redemption date.

On or after the Par Call Date, the Issuer may redeem the Notes, in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the Notes being redeemed plus accrued and unpaid interest thereon to the redemption date.

“Treasury Rate” means, with respect to any redemption date, the yield determined by the Issuer in accordance with the following two paragraphs.

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The Treasury Rate shall be determined by the Issuer after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third Business Day preceding the redemption date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated as “Selected Interest Rates (Daily)—H.15” (or any successor designation or publication) (“H.15”) under the caption “U.S. government securities–Treasury constant maturities–Nominal” (or any successor caption or heading) (“H.15 TCM”). In determining the Treasury Rate, the Issuer shall select, as applicable: (1) the yield for the Treasury constant maturity on H.15 exactly equal to the period from the redemption date to the Par Call Date (the “Remaining Life”); or (2) if there is no such Treasury constant maturity on H.15 exactly equal to the Remaining Life, the two yields – one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one yield corresponding to the Treasury constant maturity on H.15 immediately longer than the Remaining Life – and shall interpolate to the Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal places; or (3) if there is no such Treasury constant maturity on H.15 shorter than or longer than the Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to the Remaining Life. For purposes of this paragraph, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal to the relevant number of months or years, as applicable, of such Treasury constant maturity from the redemption date.

If on the third Business Day preceding the redemption date H.15 TCM or any successor designation or publication is no longer published, the Issuer shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second Business Day preceding such redemption date of the United States Treasury security maturing on, or with a maturity that is closest to, the Par Call Date, as applicable. If there is no United States Treasury security maturing on the Par Call Date but there are two or more United States Treasury securities with a maturity date equally distant from the Par Call Date one with a maturity date preceding the Par Call Date and one with a maturity date following the Par Call Date, the Issuer shall select the United States Treasury security with a maturity date preceding the Par Call Date. If there are two or more United States Treasury securities maturing on the Par Call Date or two or more United States Treasury securities meeting the criteria of the preceding sentence, the Issuer shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places.

The Issuer’s actions and determinations in determining the redemption price shall be conclusive and binding for all purposes, absent manifest error.

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Notice of any redemption of Notes may, at the Issuer’s discretion, be given subject to one or more conditions precedent, including, but not limited to, completion of a corporate transaction that is pending. In such event, the related notice of redemption will describe each such condition and, if applicable, will state that, at the Issuer’s discretion, the redemption date may be delayed until such time (including more than 60 days after the notice of redemption was given) as any or all such conditions are satisfied (or waived by the Issuer in its sole discretion), or such redemption may not occur and such notice may be rescinded in the event that any or all such conditions have not been satisfied (or waived by the Issuer in its sole discretion) by the redemption date, or by the redemption date as so delayed. If any such redemption has been rescinded or delayed, the Issuer will provide written notice to the Trustee prior to the close of business two Business Days before the redemption date and, upon receipt, the Trustee will provide such notice to each registered holder.

In the case of a partial redemption, selection of the Notes for redemption will be made by the Trustee by lot. No Notes of a principal amount of $2,000 or less will be redeemed in part. If any Note is to be redeemed in part only, the notice of redemption that relates to the Note will state the portion of the principal amount of the Note to be redeemed. A new Note in a principal amount equal to the unredeemed portion of the Note will be issued in the name of the holder of the Note upon surrender for cancellation of the original Note. For so long as the Notes are held by the Depositary, the redemption of the Notes shall be done in accordance with the policies and procedures of the Depositary.

Unless the Issuer defaults in payment of the redemption price, on and after the redemption date interest will cease to accrue on the Notes or portions thereof called for redemption.

In case the Issuer shall desire to exercise its right to redeem all or, as the case may be, a portion of the Notes, the Issuer shall, or shall cause the Trustee to, give notice of such redemption to holders of the Notes to be redeemed. Notice of any redemption will be mailed or electronically delivered (or otherwise transmitted in accordance with the Depositary’s procedures) at least 10 days but not more than 60 days before the redemption date to each holder of Notes to be redeemed. Any notice that is delivered in the manner herein provided shall be conclusively presumed to have been duly given, whether or not the registered holder received the notice. In any case, failure duly to give such notice to the holder of any Note designated for redemption in whole or in part, or any defect in the notice, shall not affect the validity of the proceedings for the redemption of any other Note.

Each such notice of redemption shall specify the amount of Notes to be redeemed, the date fixed for redemption and the applicable redemption price at which the Notes to be redeemed are to be redeemed, and shall state that payment of the redemption price of such Notes to be redeemed will be made at the office or agency of the Issuer in the Borough of Manhattan, the City and State of New York, upon presentation and surrender of such Notes, that interest accrued to the date fixed for redemption will be paid as specified in said notice and, that from and after said date interest will cease to accrue.

If the Trustee is to provide notice on behalf of the Issuer to the holders of the Notes as described herein, for a partial or full redemption, the Issuer shall give the Trustee at least 3 days’ notice in advance, a period which can be reduced upon further negotiation between the Issuer and the Trustee, of the date fixed for redemption as to the aggregate principal amount of Notes to be redeemed.

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The Issuer may, if and whenever it shall so elect, by delivery of instructions signed on its behalf by its President or any Vice President, notify the Trustee that the Issuer has elected to call all or any part of the Notes for redemption and instruct the Trustee to give notice of redemption in the manner set forth in this Note, such notice to be in the name of the Issuer.

Subject to Section 2.11 of the Base Indenture, the Issuer shall not be required (i) to issue, register the transfer of or exchange any Notes during a period beginning at the opening of business 15 days before the day of the delivery of a notice of redemption of the Notes selected for redemption and ending at the close of business on the day of such delivery, or (ii) to register the transfer of or exchange any Notes so selected for redemption in whole or in part, except the unredeemed portion of any such Notes being redeemed in part.

If (A) the Issuer’s pending acquisition of TIH Blocker II, Inc., the parent company of McGriff Insurance Services, LLC (the “Transaction”) is not completed by the parties to that certain Agreement and Plan of Merger, dated as of September 29, 2024, by and among Marsh & McLennan Agency LLC, an indirect wholly-owned subsidiary of the Issuer, BD Merger Sub, Inc., TIH Blocker II, Inc. and TIH Platform Midco, L.P. (the “Merger Agreement”), on or prior to the later of (x) September 29, 2025 or (y) the date that is five Business Days after any later date to which the parties to the Merger Agreement may agree to extend the “Outside Date” in the Merger Agreement, (B) the Merger Agreement is terminated or (C) the Issuer notifies the Trustee, in writing, that it will not pursue the consummation of the Transaction (each, a “Special Mandatory Redemption Event”), then the Issuer shall redeem all of the Notes on the Special Mandatory Redemption Date at a special mandatory redemption price equal to 101% of the aggregate principal amount of the Notes to be redeemed, plus accrued and unpaid interest from and including the date of initial issuance, or the most recent date to which interest has been paid, whichever is later, to but not including the Special Mandatory Redemption Date (the “Special Mandatory Redemption Price”).

Upon the occurrence of a Special Mandatory Redemption Event, promptly, but in no event more than five Business Days, following such Special Mandatory Redemption Event, the Issuer shall deliver written notice to the Trustee of such special mandatory redemption and the date upon which such Special Mandatory Redemption Notes will be redeemed, which shall be no earlier than the fifth Business Day following the date of such notice (the “Special Mandatory Redemption Date”), and a notice to registered holders of the Notes that such Notes shall be redeemed and specifying the Special Mandatory Redemption Date and such other information as required, to the extent applicable, by the Base Indenture (the “Special Mandatory Redemption Notice”), which shall be delivered in the name and at the expense of the Issuer. The Trustee shall promptly mail or electronically deliver the Special Mandatory Redemption Notice, according to the procedures of The Depository Trust Company, to each registered holder of Notes to be redeemed at such holder’s registered address.

B-11

If funds sufficient to pay the Special Mandatory Redemption Price of all of the Notes to be redeemed on the Special Mandatory Redemption Date are deposited with a Paying Agent or the Trustee on or before such Special Mandatory Redemption Date, then on and after such Special Mandatory Redemption Date, the Notes shall cease to bear interest and, other than the right to receive the Special Mandatory Redemption Price, all rights under the Notes shall terminate.

The Indenture contains provisions permitting the Issuer and the Trustee, with the consent of the holders of not less than a majority in aggregate principal amount of the Notes of all of the series at the time Outstanding affected thereby (all such series voting together as a single class), as defined in the Indenture, to execute supplemental indentures for the purpose of adding any provisions to or changing in any manner or eliminating any of the provisions of the Base Indenture or of any supplemental indenture or of modifying in any manner the rights of the holders of the Notes; provided, however, that no such supplemental indenture shall, without the consent of the holders of each Security then Outstanding and affected thereby (i) extend the fixed maturity of any Securities, including the Notes, or reduce the principal amount thereof, or reduce the rate or extend the time of payment of interest thereon, or reduce any premium payable upon the redemption thereof, or (ii) reduce the aforesaid percentage of Securities, the holders of which are required to consent to any such supplemental indenture. The Indenture also contains provisions permitting the holders of a majority in aggregate principal amount of the Notes of all series at the time Outstanding affected thereby (all such series voting together as a single class), to waive any past default in the performance of any of the covenants contained in the Base Indenture, or established pursuant to the Base Indenture with respect to such series, and its consequences, except a default in the payment of the principal of or premium, if any, or interest on any Securities, including the Notes, in which case, each such affected series voting as a separate class. Any such consent or waiver by the registered holder of this Note (unless revoked as provided in the Base Indenture) shall be conclusive and binding upon such holder and upon all future holders and owners of this Note and of any Note issued in exchange herefor or in place hereof (whether by registration of transfer or otherwise), irrespective of whether or not any notation of such consent or waiver is made upon this Note.

No reference herein to the Indenture and no provision of this Note or of the Indenture shall alter or impair the obligation of the Issuer, which is absolute and unconditional, to pay the principal of and premium, if any, and interest on this Note at the time and place and at the rate and in the money herein prescribed.

The Issuer is subject to certain covenants contained in the Indenture with respect to, and for the benefit of the holders of, the Notes. The Trustee shall not be obligated to monitor or confirm, on a continuing basis or otherwise, the Issuer’s compliance with the covenants contained in the Indenture or with respect to reports or other certificates filed under the Indenture; provided, however, that nothing herein shall relieve the Trustee of any obligations to monitor the Issuer’s timely delivery of all reports and certificates required under Section 5.03 of the Base Indenture and to fulfill its obligations under Article VII of the Indenture. If an Event of Default as defined in the Indenture with respect to the Notes shall occur and be continuing, the principal of the Notes may be declared due and payable in the manner and with the effect provided in the Indenture.

B-12

As provided in and subject to the provisions of the Indenture, the holder of this Note shall not have the right to institute any proceeding with respect to the Indenture or for the appointment of a receiver or Trustee or for any other remedy thereunder, unless such holder shall have previously given the Trustee written notice of a continuing Event of Default with respect to the Notes, the holders of not less than 25% in principal amount of the Outstanding Notes (in the case of an Event of Default described in clauses (a)(i) or (a)(ii) of Section 6.01 of the Base Indenture, each such series voting as a separate class, and in the case of an Event of Default described in clauses (a)(iii), (a)(iv), (a)(v) or (a)(vi) of Section 6.01 of the Base Indenture, all affected series voting together as a single class) shall have made written request to the Trustee to institute proceedings in respect of such Event of Default as Trustee and offered the Trustee reasonable indemnity and the Trustee shall have failed to institute any such proceeding for 60 days after receipt of such notice, request and offer of indemnity and the Trustee shall not have received from the holders of a majority in principal amount of the Notes at the time Outstanding (voting as provided in Section 6.04(b) of the Base Indenture) a direction inconsistent with such request. The foregoing shall not apply to any suit instituted by the holder of this Note for the enforcement of any payment of principal hereof or any interest on or after the respective due dates expressed herein.

As provided in the Indenture and subject to certain limitations therein set forth, this Note is transferable by the registered holder hereof on the Security Register of the Issuer, upon surrender of this Note for registration of transfer at the office or agency of the Issuer in the Borough of Manhattan, the City and State of New York accompanied by a written instrument or instruments of transfer in form satisfactory to the Issuer or the Trustee duly executed by the registered holder hereof or his attorney duly authorized in writing, and thereupon one or more new Notes of authorized denominations and for the same aggregate principal amount and series will be issued to the designated transferee or transferees. No service charge will be made for any such transfer, but the Issuer may require payment of a sum sufficient to cover any tax or other governmental charge payable in relation thereto.

Prior to due presentment for registration of transfer of this Note, the Issuer, the Trustee, any paying agent and any Security Registrar may deem and treat the registered holder hereof as the absolute owner hereof (whether or not this Note shall be overdue and notwithstanding any notice of ownership or writing hereon made by anyone other than the Security Registrar) for the purpose of receiving payment of or on account of the principal hereof and premium, if any, and interest due hereon and for all other purposes, and neither the Issuer nor the Trustee nor any paying agent nor any Note Registrar shall be affected by any notice to the contrary.

No recourse shall be had for the payment of the principal of or the interest on this Note, or for any claim based hereon, or otherwise in respect hereof, or based on or in respect of the Indenture, against any incorporator, stockholder, officer or director, past, present or future, as such, of the Issuer or of any predecessor or successor corporation, whether by virtue of any constitution, statute or rule of law, or by the enforcement of any assessment or penalty or otherwise, all such liability being, by the acceptance hereof and as part of the consideration for the issuance hereof, expressly waived and released.

B-13

The Notes are issuable only in registered form without coupons in authorized denominations. As provided in the Indenture and subject to certain limitations herein and therein set forth, Notes so issued are exchangeable for a like aggregate principal amount of Notes of a different authorized denomination, as requested by the holder surrendering the same.

All terms used in this Note which are defined in the Indenture shall have the meanings assigned to them in the Indenture.

THE INDENTURE AND THE NOTES INCLUDING THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK.

Pursuant to a recommendation promulgated by the Committee on Uniform Security Identification Procedures, the Issuer has caused “CUSIP” numbers to be printed on the Notes as a convenience to the holders of the Notes. No representation is made as to the correctness or accuracy of such CUSIP numbers as printed on the Notes, and reliance may be placed only on the other identification numbers printed hereon.

Unless the certificate of authentication hereon has been executed by or on behalf of the Trustee by manual signature, which may be delivered via electronic transmission, this Note shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purposes.

B-14

Exhibit C

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR SECURITIES IN DEFINITIVE FORM IN ACCORDANCE WITH THE PROVISIONS OF THE INDENTURE AND THE TERMS OF THE SECURITIES AND EXCEPT AS OTHERWISE PROVIDED IN SECTION 2.11 OF THE BASE INDENTURE, THIS NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY DTC TO A NOMINEE OF DTC OR BY A NOMINEE OF DTC TO DTC OR ANOTHER NOMINEE OF DTC OR BY DTC OR ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITARY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITARY.

C-1

CUSIP No. 571748CB6

ISIN No. US571748CB69

MARSH & McLENNAN COMPANIES, INC.

4.850% Senior Notes due 2031

MARSH & McLENNAN COMPANIES, INC., a Delaware corporation (the “Issuer”, which term includes any successor corporation under the Indenture hereinafter referred to), for value received, hereby promises to pay to Cede & Co., or its registered assigns, the principal sum of [__________________] MILLION DOLLARS ($[__________]) (which aggregate principal amount may from time to time be increased or decreased to such other aggregate principal amounts by adjustments made on the Schedule of Increases or Decreases in Global Security attached hereto) on November 15, 2031 and to pay interest on said principal sum from November 8, 2024, or from the most recent interest payment date (each such date, an “Interest Payment Date”) to which interest has been paid or duly provided for semiannually on May 15 and November 15 of each year commencing May 15, 2025 at the rate of 4.850% per annum until the principal hereof shall have become due and payable, and on any overdue principal and premium, if any, and (without duplication and to the extent that payment of such interest is enforceable under applicable law) on any overdue installment of interest at the same rate per annum. The amount of interest payable on any Interest Payment Date shall be computed on the basis of a 360-day year of twelve 30-day months. In the event that any date on which interest is payable on this Note is not a Business Day, then payment of interest payable on such date will be made on the next succeeding day which is a Business Day (and without any interest or other payment in respect of any such delay). The interest installment so payable, and punctually paid or duly provided for, on any Interest Payment Date will, as provided in the Indenture (hereafter defined), be paid to the person in whose name this Note (or one or more Predecessor Securities, as defined in said Indenture) is registered at the close of business on the regular record date for such interest installment which shall be the April 30 and October 31 preceding such Interest Payment Date. Any such interest installment not punctually paid or duly provided for (as defined in the Indenture, the “Defaulted Interest”) shall forthwith cease to be payable to the registered holders on such regular record date, and may be paid to the person in whose name this Note (or one or more Predecessor Securities) is registered at the close of business on a special record date to be fixed by the Trustee for the payment of such Defaulted Interest, which shall not be more than 15 nor less than 10 days prior to the date of the proposed payment, and not less than 10 days after the receipt by the Trustee of the notice of the proposed payment or at any time in any other lawful manner not inconsistent with the requirements of any securities exchange on which the Notes may be listed, and upon such notice as may be required by such exchange, all as more fully provided in the Indenture. The principal of (and premium, if any) and the interest on this Note shall be payable at the office or agency of the Trustee maintained for that purpose in any coin or currency of the United States of America which at the time of payment is legal tender for payment of public and private debts; provided, however, that payment of interest may be made at the option of the Issuer by check mailed to the registered holder at such address as shall appear in the Security Register. Notwithstanding the foregoing, so long as the registered holder of this Note is Cede & Co., the payment of the principal of (and premium, if any) and interest on this Note will be made at such place and to such account as may be designated by DTC.

C-2

The indebtedness evidenced by this Note is, to the extent provided in the Indenture, senior and unsecured and will rank in right of payment on parity with all other senior unsecured obligations of the Issuer.

This Note shall not be entitled to any benefit under the Indenture hereinafter referred to or be valid until the Certificate of Authentication hereon shall have been signed manually by or on behalf of the Trustee.

The provisions of this Note are continued on the reverse side hereof and such continued provisions shall for all purposes have the same effect as though fully set forth at this place.

C-3

IN WITNESS WHEREOF, the Issuer has caused this instrument to be executed.

Dated:

Attest:

[Signature Page to Global Note]

C-4

CERTIFICATE OF AUTHENTICATION

This is one of the Notes of the series of Notes described in the within-mentioned Indenture.

C-5

ASSIGNMENT FORM

FOR VALUE RECEIVED, the undersigned hereby

sells, assigns and transfers to

(Insert Social Security number or other identifying number of assignee)

(Please print or typewrite name and address, including zip code of assignee)

the within Note of Marsh & McLennan Companies, Inc. and hereby does irrevocably constitute and appoint

Attorney to transfer said Note on the books of the within-named Issuer with full power of substitution in the premises.

Signature(s) must be guaranteed by an eligible Guarantor Institution (banks, stock brokers, savings and loan associations and credit unions) with membership in an approved signature guarantee medallion program pursuant to Securities and Exchange Commission Rule 17Ad-15.

NOTICE: The signature to this assignment must correspond with the name as it appears on the first page of the within Note in every particular, without alteration or enlargement or any change whatever.

C-6

SCHEDULE OF INCREASES OR DECREASES IN GLOBAL SECURITY

MARSH & McLENNAN COMPANIES, INC.

4.850% Senior Notes due 2031

The initial aggregate principal amount of this Global Security is $[_____________]. The following increases or decreases in this Global Security have been made:

No: _____

C-7

MARSH & McLENNAN COMPANIES, INC.

4.850% Senior Notes due 2031

This Note is one of a duly authorized series of Securities (referred to in the Base Indenture (hereafter defined)), of the Issuer (herein sometimes referred to as the “Notes”), all such Securities issued or to be issued in one or more series under and pursuant to an indenture (the “Base Indenture”), dated as of July 15, 2011, between the Issuer and The Bank of New York Mellon, as Trustee (the “Trustee”), as supplemented in the case of the Notes by the Nineteenth Supplemental Indenture, dated as of November 8, 2024, between the Issuer and the Trustee (the Base Indenture, as so supplemented, the “Indenture”), to which Indenture and all indentures supplemental thereto reference is hereby made for a description of the rights, limitations of rights, obligations, duties and immunities thereunder of the Trustee, the Issuer and the holders of the Notes. This series of Notes is initially limited in aggregate principal amount as specified in said Nineteenth Supplemental Indenture. This series of Notes and any Additional Notes of this series shall constitute one series for all purposes under the Indenture, including without limitation, amendments, waivers and redemptions. The terms and conditions of this series of Notes and any Additional Notes of this series (other than the issue price, the date of issuance, the payment of interest accruing prior to the issue date of the Additional Notes and the first payment of interest following such issue date) shall be the same and shall bear the same CUSIP number.

Prior to September 15, 2031 (the “Par Call Date”), the Issuer may redeem the Notes, at its option, in whole or in part, at any time and from time to time, at a redemption price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of:

(1) (a) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the redemption date (assuming the Notes matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 10 basis points, less (b) interest accrued to the date of redemption, and

(2) 100% of the principal amount of the Notes to be redeemed,

plus, in either case, accrued and unpaid interest thereon to the redemption date.

On or after the Par Call Date, the Issuer may redeem the Notes, in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the Notes being redeemed plus accrued and unpaid interest thereon to the redemption date.

“Treasury Rate” means, with respect to any redemption date, the yield determined by the Issuer in accordance with the following two paragraphs.

C-8

The Treasury Rate shall be determined by the Issuer after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third Business Day preceding the redemption date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated as “Selected Interest Rates (Daily)—H.15” (or any successor designation or publication) (“H.15”) under the caption “U.S. government securities–Treasury constant maturities–Nominal” (or any successor caption or heading) (“H.15 TCM”). In determining the Treasury Rate, the Issuer shall select, as applicable: (1) the yield for the Treasury constant maturity on H.15 exactly equal to the period from the redemption date to the Par Call Date (the “Remaining Life”); or (2) if there is no such Treasury constant maturity on H.15 exactly equal to the Remaining Life, the two yields – one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one yield corresponding to the Treasury constant maturity on H.15 immediately longer than the Remaining Life – and shall interpolate to the Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal places; or (3) if there is no such Treasury constant maturity on H.15 shorter than or longer than the Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to the Remaining Life. For purposes of this paragraph, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal to the relevant number of months or years, as applicable, of such Treasury constant maturity from the redemption date.

If on the third Business Day preceding the redemption date H.15 TCM or any successor designation or publication is no longer published, the Issuer shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second Business Day preceding such redemption date of the United States Treasury security maturing on, or with a maturity that is closest to, the Par Call Date, as applicable. If there is no United States Treasury security maturing on the Par Call Date but there are two or more United States Treasury securities with a maturity date equally distant from the Par Call Date one with a maturity date preceding the Par Call Date and one with a maturity date following the Par Call Date, the Issuer shall select the United States Treasury security with a maturity date preceding the Par Call Date. If there are two or more United States Treasury securities maturing on the Par Call Date or two or more United States Treasury securities meeting the criteria of the preceding sentence, the Issuer shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places.

The Issuer’s actions and determinations in determining the redemption price shall be conclusive and binding for all purposes, absent manifest error.

C-9

Notice of any redemption of Notes may, at the Issuer’s discretion, be given subject to one or more conditions precedent, including, but not limited to, completion of a corporate transaction that is pending. In such event, the related notice of redemption will describe each such condition and, if applicable, will state that, at the Issuer’s discretion, the redemption date may be delayed until such time (including more than 60 days after the notice of redemption was given) as any or all such conditions are satisfied (or waived by the Issuer in its sole discretion), or such redemption may not occur and such notice may be rescinded in the event that any or all such conditions have not been satisfied (or waived by the Issuer in its sole discretion) by the redemption date, or by the redemption date as so delayed. If any such redemption has been rescinded or delayed, the Issuer will provide written notice to the Trustee prior to the close of business two Business Days before the redemption date and, upon receipt, the Trustee will provide such notice to each registered holder.

In the case of a partial redemption, selection of the Notes for redemption will be made by the Trustee by lot. No Notes of a principal amount of $2,000 or less will be redeemed in part. If any Note is to be redeemed in part only, the notice of redemption that relates to the Note will state the portion of the principal amount of the Note to be redeemed. A new Note in a principal amount equal to the unredeemed portion of the Note will be issued in the name of the holder of the Note upon surrender for cancellation of the original Note. For so long as the Notes are held by the Depositary, the redemption of the Notes shall be done in accordance with the policies and procedures of the Depositary.

Unless the Issuer defaults in payment of the redemption price, on and after the redemption date interest will cease to accrue on the Notes or portions thereof called for redemption.

In case the Issuer shall desire to exercise its right to redeem all or, as the case may be, a portion of the Notes, the Issuer shall, or shall cause the Trustee to, give notice of such redemption to holders of the Notes to be redeemed. Notice of any redemption will be mailed or electronically delivered (or otherwise transmitted in accordance with the Depositary’s procedures) at least 10 days but not more than 60 days before the redemption date to each holder of Notes to be redeemed. Any notice that is delivered in the manner herein provided shall be conclusively presumed to have been duly given, whether or not the registered holder received the notice. In any case, failure duly to give such notice to the holder of any Note designated for redemption in whole or in part, or any defect in the notice, shall not affect the validity of the proceedings for the redemption of any other Note.

Each such notice of redemption shall specify the amount of Notes to be redeemed, the date fixed for redemption and the applicable redemption price at which the Notes to be redeemed are to be redeemed, and shall state that payment of the redemption price of such Notes to be redeemed will be made at the office or agency of the Issuer in the Borough of Manhattan, the City and State of New York, upon presentation and surrender of such Notes, that interest accrued to the date fixed for redemption will be paid as specified in said notice and, that from and after said date interest will cease to accrue.

C-10

If the Trustee is to provide notice on behalf of the Issuer to the holders of the Notes as described herein, for a partial or full redemption, the Issuer shall give the Trustee at least 3 days’ notice in advance, a period which can be reduced upon further negotiation between the Issuer and the Trustee, of the date fixed for redemption as to the aggregate principal amount of Notes to be redeemed.

The Issuer may, if and whenever it shall so elect, by delivery of instructions signed on its behalf by its President or any Vice President, notify the Trustee that the Issuer has elected to call all or any part of the Notes for redemption and instruct the Trustee to give notice of redemption in the manner set forth in this Note, such notice to be in the name of the Issuer.

Subject to Section 2.11 of the Base Indenture, the Issuer shall not be required (i) to issue, register the transfer of or exchange any Notes during a period beginning at the opening of business 15 days before the day of the delivery of a notice of redemption of the Notes selected for redemption and ending at the close of business on the day of such delivery, or (ii) to register the transfer of or exchange any Notes so selected for redemption in whole or in part, except the unredeemed portion of any such Notes being redeemed in part.

If (A) the Issuer’s pending acquisition of TIH Blocker II, Inc., the parent company of McGriff Insurance Services, LLC (the “Transaction”) is not completed by the parties to that certain Agreement and Plan of Merger, dated as of September 29, 2024, by and among Marsh & McLennan Agency LLC, an indirect wholly-owned subsidiary of the Issuer, BD Merger Sub, Inc., TIH Blocker II, Inc. and TIH Platform Midco, L.P. (the “Merger Agreement”), on or prior to the later of (x) September 29, 2025 or (y) the date that is five Business Days after any later date to which the parties to the Merger Agreement may agree to extend the “Outside Date” in the Merger Agreement, (B) the Merger Agreement is terminated or (C) the Issuer notifies the Trustee, in writing, that it will not pursue the consummation of the Transaction (each, a “Special Mandatory Redemption Event”), then the Issuer shall redeem all of the Notes on the Special Mandatory Redemption Date at a special mandatory redemption price equal to 101% of the aggregate principal amount of the Notes to be redeemed, plus accrued and unpaid interest from and including the date of initial issuance, or the most recent date to which interest has been paid, whichever is later, to but not including the Special Mandatory Redemption Date (the “Special Mandatory Redemption Price”).

Upon the occurrence of a Special Mandatory Redemption Event, promptly, but in no event more than five Business Days, following such Special Mandatory Redemption Event, the Issuer shall deliver written notice to the Trustee of such special mandatory redemption and the date upon which such Special Mandatory Redemption Notes will be redeemed, which shall be no earlier than the fifth Business Day following the date of such notice (the “Special Mandatory Redemption Date”), and a notice to registered holders of the Notes that such Notes shall be redeemed and specifying the Special Mandatory Redemption Date and such other information as required, to the extent applicable, by the Base Indenture (the “Special Mandatory Redemption Notice”), which shall be delivered in the name and at the expense of the Issuer. The Trustee shall promptly mail or electronically deliver the Special Mandatory Redemption Notice, according to the procedures of The Depository Trust Company, to each registered holder of Notes to be redeemed at such holder’s registered address.

C-11

If funds sufficient to pay the Special Mandatory Redemption Price of all of the Notes to be redeemed on the Special Mandatory Redemption Date are deposited with a Paying Agent or the Trustee on or before such Special Mandatory Redemption Date, then on and after such Special Mandatory Redemption Date, the Notes shall cease to bear interest and, other than the right to receive the Special Mandatory Redemption Price, all rights under the Notes shall terminate.

The Indenture contains provisions permitting the Issuer and the Trustee, with the consent of the holders of not less than a majority in aggregate principal amount of the Notes of all of the series at the time Outstanding affected thereby (all such series voting together as a single class), as defined in the Indenture, to execute supplemental indentures for the purpose of adding any provisions to or changing in any manner or eliminating any of the provisions of the Base Indenture or of any supplemental indenture or of modifying in any manner the rights of the holders of the Notes; provided, however, that no such supplemental indenture shall, without the consent of the holders of each Security then Outstanding and affected thereby (i) extend the fixed maturity of any Securities, including the Notes, or reduce the principal amount thereof, or reduce the rate or extend the time of payment of interest thereon, or reduce any premium payable upon the redemption thereof, or (ii) reduce the aforesaid percentage of Securities, the holders of which are required to consent to any such supplemental indenture. The Indenture also contains provisions permitting the holders of a majority in aggregate principal amount of the Notes of all series at the time Outstanding affected thereby (all such series voting together as a single class), to waive any past default in the performance of any of the covenants contained in the Base Indenture, or established pursuant to the Base Indenture with respect to such series, and its consequences, except a default in the payment of the principal of or premium, if any, or interest on any Securities, including the Notes, in which case, each such affected series voting as a separate class. Any such consent or waiver by the registered holder of this Note (unless revoked as provided in the Base Indenture) shall be conclusive and binding upon such holder and upon all future holders and owners of this Note and of any Note issued in exchange herefor or in place hereof (whether by registration of transfer or otherwise), irrespective of whether or not any notation of such consent or waiver is made upon this Note.

No reference herein to the Indenture and no provision of this Note or of the Indenture shall alter or impair the obligation of the Issuer, which is absolute and unconditional, to pay the principal of and premium, if any, and interest on this Note at the time and place and at the rate and in the money herein prescribed.

The Issuer is subject to certain covenants contained in the Indenture with respect to, and for the benefit of the holders of, the Notes. The Trustee shall not be obligated to monitor or confirm, on a continuing basis or otherwise, the Issuer’s compliance with the covenants contained in the Indenture or with respect to reports or other certificates filed under the Indenture; provided, however, that nothing herein shall relieve the Trustee of any obligations to monitor the Issuer’s timely delivery of all reports and certificates required under Section 5.03 of the Base Indenture and to fulfill its obligations under Article VII of the Indenture. If an Event of Default as defined in the Indenture with respect to the Notes shall occur and be continuing, the principal of the Notes may be declared due and payable in the manner and with the effect provided in the Indenture.

C-12

As provided in and subject to the provisions of the Indenture, the holder of this Note shall not have the right to institute any proceeding with respect to the Indenture or for the appointment of a receiver or Trustee or for any other remedy thereunder, unless such holder shall have previously given the Trustee written notice of a continuing Event of Default with respect to the Notes, the holders of not less than 25% in principal amount of the Outstanding Notes (in the case of an Event of Default described in clauses (a)(i) or (a)(ii) of Section 6.01 of the Base Indenture, each such series voting as a separate class, and in the case of an Event of Default described in clauses (a)(iii), (a)(iv), (a)(v) or (a)(vi) of Section 6.01 of the Base Indenture, all affected series voting together as a single class) shall have made written request to the Trustee to institute proceedings in respect of such Event of Default as Trustee and offered the Trustee reasonable indemnity and the Trustee shall have failed to institute any such proceeding for 60 days after receipt of such notice, request and offer of indemnity and the Trustee shall not have received from the holders of a majority in principal amount of the Notes at the time Outstanding (voting as provided in Section 6.04(b) of the Base Indenture) a direction inconsistent with such request. The foregoing shall not apply to any suit instituted by the holder of this Note for the enforcement of any payment of principal hereof or any interest on or after the respective due dates expressed herein.

As provided in the Indenture and subject to certain limitations therein set forth, this Note is transferable by the registered holder hereof on the Security Register of the Issuer, upon surrender of this Note for registration of transfer at the office or agency of the Issuer in the Borough of Manhattan, the City and State of New York accompanied by a written instrument or instruments of transfer in form satisfactory to the Issuer or the Trustee duly executed by the registered holder hereof or his attorney duly authorized in writing, and thereupon one or more new Notes of authorized denominations and for the same aggregate principal amount and series will be issued to the designated transferee or transferees. No service charge will be made for any such transfer, but the Issuer may require payment of a sum sufficient to cover any tax or other governmental charge payable in relation thereto.

Prior to due presentment for registration of transfer of this Note, the Issuer, the Trustee, any paying agent and any Security Registrar may deem and treat the registered holder hereof as the absolute owner hereof (whether or not this Note shall be overdue and notwithstanding any notice of ownership or writing hereon made by anyone other than the Security Registrar) for the purpose of receiving payment of or on account of the principal hereof and premium, if any, and interest due hereon and for all other purposes, and neither the Issuer nor the Trustee nor any paying agent nor any Note Registrar shall be affected by any notice to the contrary.

No recourse shall be had for the payment of the principal of or the interest on this Note, or for any claim based hereon, or otherwise in respect hereof, or based on or in respect of the Indenture, against any incorporator, stockholder, officer or director, past, present or future, as such, of the Issuer or of any predecessor or successor corporation, whether by virtue of any constitution, statute or rule of law, or by the enforcement of any assessment or penalty or otherwise, all such liability being, by the acceptance hereof and as part of the consideration for the issuance hereof, expressly waived and released.

C-13

The Notes are issuable only in registered form without coupons in authorized denominations. As provided in the Indenture and subject to certain limitations herein and therein set forth, Notes so issued are exchangeable for a like aggregate principal amount of Notes of a different authorized denomination, as requested by the holder surrendering the same.

All terms used in this Note which are defined in the Indenture shall have the meanings assigned to them in the Indenture.

THE INDENTURE AND THE NOTES INCLUDING THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK.

Pursuant to a recommendation promulgated by the Committee on Uniform Security Identification Procedures, the Issuer has caused “CUSIP” numbers to be printed on the Notes as a convenience to the holders of the Notes. No representation is made as to the correctness or accuracy of such CUSIP numbers as printed on the Notes, and reliance may be placed only on the other identification numbers printed hereon.

Unless the certificate of authentication hereon has been executed by or on behalf of the Trustee by manual signature, which may be delivered via electronic transmission, this Note shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purposes.

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Exhibit D

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR SECURITIES IN DEFINITIVE FORM IN ACCORDANCE WITH THE PROVISIONS OF THE INDENTURE AND THE TERMS OF THE SECURITIES AND EXCEPT AS OTHERWISE PROVIDED IN SECTION 2.11 OF THE BASE INDENTURE, THIS NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY DTC TO A NOMINEE OF DTC OR BY A NOMINEE OF DTC TO DTC OR ANOTHER NOMINEE OF DTC OR BY DTC OR ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITARY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITARY.

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CUSIP No. 571748CC4

ISIN No. US571748CC43

MARSH & McLENNAN COMPANIES, INC.

5.000% Senior Notes due 2035

MARSH & McLENNAN COMPANIES, INC., a Delaware corporation (the “Issuer”, which term includes any successor corporation under the Indenture hereinafter referred to), for value received, hereby promises to pay to Cede & Co., or its registered assigns, the principal sum of [__________________] MILLION DOLLARS ($[__________]) (which aggregate principal amount may from time to time be increased or decreased to such other aggregate principal amounts by adjustments made on the Schedule of Increases or Decreases in Global Security attached hereto) on March 15, 2035 and to pay interest on said principal sum from November 8, 2024, or from the most recent interest payment date (each such date, an “Interest Payment Date”) to which interest has been paid or duly provided for semiannually on March 15 and September 15 of each year commencing March 15, 2025 at the rate of 5.000% per annum until the principal hereof shall have become due and payable, and on any overdue principal and premium, if any, and (without duplication and to the extent that payment of such interest is enforceable under applicable law) on any overdue installment of interest at the same rate per annum. The amount of interest payable on any Interest Payment Date shall be computed on the basis of a 360-day year of twelve 30-day months. In the event that any date on which interest is payable on this Note is not a Business Day, then payment of interest payable on such date will be made on the next succeeding day which is a Business Day (and without any interest or other payment in respect of any such delay). The interest installment so payable, and punctually paid or duly provided for, on any Interest Payment Date will, as provided in the Indenture (hereafter defined), be paid to the person in whose name this Note (or one or more Predecessor Securities, as defined in said Indenture) is registered at the close of business on the regular record date for such interest installment which shall be the February 28 (or, in the case of a leap year, February 29) and August 31 preceding such Interest Payment Date. Any such interest installment not punctually paid or duly provided for (as defined in the Indenture, the “Defaulted Interest”) shall forthwith cease to be payable to the registered holders on such regular record date, and may be paid to the person in whose name this Note (or one or more Predecessor Securities) is registered at the close of business on a special record date to be fixed by the Trustee for the payment of such Defaulted Interest, which shall not be more than 15 nor less than 10 days prior to the date of the proposed payment, and not less than 10 days after the receipt by the Trustee of the notice of the proposed payment or at any time in any other lawful manner not inconsistent with the requirements of any securities exchange on which the Notes may be listed, and upon such notice as may be required by such exchange, all as more fully provided in the Indenture. The principal of (and premium, if any) and the interest on this Note shall be payable at the office or agency of the Trustee maintained for that purpose in any coin or currency of the United States of America

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which at the time of payment is legal tender for payment of public and private debts; provided, however, that payment of interest may be made at the option of the Issuer by check mailed to the registered holder at such address as shall appear in the Security Register. Notwithstanding the foregoing, so long as the registered holder of this Note is Cede & Co., the payment of the principal of (and premium, if any) and interest on this Note will be made at such place and to such account as may be designated by DTC.

The indebtedness evidenced by this Note is, to the extent provided in the Indenture, senior and unsecured and will rank in right of payment on parity with all other senior unsecured obligations of the Issuer.

This Note shall not be entitled to any benefit under the Indenture hereinafter referred to or be valid until the Certificate of Authentication hereon shall have been signed manually by or on behalf of the Trustee.

The provisions of this Note are continued on the reverse side hereof and such continued provisions shall for all purposes have the same effect as though fully set forth at this place.

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IN WITNESS WHEREOF, the Issuer has caused this instrument to be executed.

Dated:

Attest:

[Signature Page to Global Note]

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CERTIFICATE OF AUTHENTICATION

This is one of the Notes of the series of Notes described in the within-mentioned Indenture.

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ASSIGNMENT FORM

FOR VALUE RECEIVED, the undersigned hereby

sells, assigns and transfers to

(Insert Social Security number or other identifying number of assignee)

(Please print or typewrite name and address, including zip code of assignee)

the within Note of Marsh & McLennan Companies, Inc. and hereby does irrevocably constitute and appoint

Attorney to transfer said Note on the books of the within-named Issuer with full power of substitution in the premises.

Signature(s) must be guaranteed by an eligible Guarantor Institution (banks, stock brokers, savings and loan associations and credit unions) with membership in an approved signature guarantee medallion program pursuant to Securities and Exchange Commission Rule 17Ad-15.

NOTICE: The signature to this assignment must correspond with the name as it appears on the first page of the within Note in every particular, without alteration or enlargement or any change whatever.

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SCHEDULE OF INCREASES OR DECREASES IN GLOBAL SECURITY

MARSH & McLENNAN COMPANIES, INC.

5.000% Senior Notes due 2035

The initial aggregate principal amount of this Global Security is $[_____________]. The following increases or decreases in this Global Security have been made:

No: _____

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MARSH & McLENNAN COMPANIES, INC.

5.000% Senior Notes due 2035

This Note is one of a duly authorized series of Securities (referred to in the Base Indenture (hereafter defined)), of the Issuer (herein sometimes referred to as the “Notes”), all such Securities issued or to be issued in one or more series under and pursuant to an indenture (the “Base Indenture”), dated as of July 15, 2011, between the Issuer and The Bank of New York Mellon, as Trustee (the “Trustee”), as supplemented in the case of the Notes by the Nineteenth Supplemental Indenture, dated as of November 8, 2024, between the Issuer and the Trustee (the Base Indenture, as so supplemented, the “Indenture”), to which Indenture and all indentures supplemental thereto reference is hereby made for a description of the rights, limitations of rights, obligations, duties and immunities thereunder of the Trustee, the Issuer and the holders of the Notes. This series of Notes is initially limited in aggregate principal amount as specified in said Nineteenth Supplemental Indenture. This series of Notes and any Additional Notes of this series shall constitute one series for all purposes under the Indenture, including without limitation, amendments, waivers and redemptions. The terms and conditions of this series of Notes and any Additional Notes of this series (other than the issue price, the date of issuance, the payment of interest accruing prior to the issue date of the Additional Notes and the first payment of interest following such issue date) shall be the same and shall bear the same CUSIP number.

Prior to December 15, 2034 (the “Par Call Date”), the Issuer may redeem the Notes, at its option, in whole or in part, at any time and from time to time, at a redemption price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of:

(1) (a) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the redemption date (assuming the Notes matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 15 basis points, less (b) interest accrued to the date of redemption, and

(2) 100% of the principal amount of the Notes to be redeemed,

plus, in either case, accrued and unpaid interest thereon to the redemption date.

On or after the Par Call Date, the Issuer may redeem the Notes, in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the Notes being redeemed plus accrued and unpaid interest thereon to the redemption date.

“Treasury Rate” means, with respect to any redemption date, the yield determined by the Issuer in accordance with the following two paragraphs.

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The Treasury Rate shall be determined by the Issuer after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third Business Day preceding the redemption date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated as “Selected Interest Rates (Daily)—H.15” (or any successor designation or publication) (“H.15”) under the caption “U.S. government securities–Treasury constant maturities–Nominal” (or any successor caption or heading) (“H.15 TCM”). In determining the Treasury Rate, the Issuer shall select, as applicable: (1) the yield for the Treasury constant maturity on H.15 exactly equal to the period from the redemption date to the Par Call Date (the “Remaining Life”); or (2) if there is no such Treasury constant maturity on H.15 exactly equal to the Remaining Life, the two yields – one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one yield corresponding to the Treasury constant maturity on H.15 immediately longer than the Remaining Life – and shall interpolate to the Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal places; or (3) if there is no such Treasury constant maturity on H.15 shorter than or longer than the Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to the Remaining Life. For purposes of this paragraph, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal to the relevant number of months or years, as applicable, of such Treasury constant maturity from the redemption date.

If on the third Business Day preceding the redemption date H.15 TCM or any successor designation or publication is no longer published, the Issuer shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second Business Day preceding such redemption date of the United States Treasury security maturing on, or with a maturity that is closest to, the Par Call Date, as applicable. If there is no United States Treasury security maturing on the Par Call Date but there are two or more United States Treasury securities with a maturity date equally distant from the Par Call Date one with a maturity date preceding the Par Call Date and one with a maturity date following the Par Call Date, the Issuer shall select the United States Treasury security with a maturity date preceding the Par Call Date. If there are two or more United States Treasury securities maturing on the Par Call Date or two or more United States Treasury securities meeting the criteria of the preceding sentence, the Issuer shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places.

The Issuer’s actions and determinations in determining the redemption price shall be conclusive and binding for all purposes, absent manifest error.

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Notice of any redemption of Notes may, at the Issuer’s discretion, be given subject to one or more conditions precedent, including, but not limited to, completion of a corporate transaction that is pending. In such event, the related notice of redemption will describe each such condition and, if applicable, will state that, at the Issuer’s discretion, the redemption date may be delayed until such time (including more than 60 days after the notice of redemption was given) as any or all such conditions are satisfied (or waived by the Issuer in its sole discretion), or such redemption may not occur and such notice may be rescinded in the event that any or all such conditions have not been satisfied (or waived by the Issuer in its sole discretion) by the redemption date, or by the redemption date as so delayed. If any such redemption has been rescinded or delayed, the Issuer will provide written notice to the Trustee prior to the close of business two Business Days before the redemption date and, upon receipt, the Trustee will provide such notice to each registered holder.

In the case of a partial redemption, selection of the Notes for redemption will be made by the Trustee by lot. No Notes of a principal amount of $2,000 or less will be redeemed in part. If any Note is to be redeemed in part only, the notice of redemption that relates to the Note will state the portion of the principal amount of the Note to be redeemed. A new Note in a principal amount equal to the unredeemed portion of the Note will be issued in the name of the holder of the Note upon surrender for cancellation of the original Note. For so long as the Notes are held by the Depositary, the redemption of the Notes shall be done in accordance with the policies and procedures of the Depositary.

Unless the Issuer defaults in payment of the redemption price, on and after the redemption date interest will cease to accrue on the Notes or portions thereof called for redemption.

In case the Issuer shall desire to exercise its right to redeem all or, as the case may be, a portion of the Notes, the Issuer shall, or shall cause the Trustee to, give notice of such redemption to holders of the Notes to be redeemed. Notice of any redemption will be mailed or electronically delivered (or otherwise transmitted in accordance with the Depositary’s procedures) at least 10 days but not more than 60 days before the redemption date to each holder of Notes to be redeemed. Any notice that is delivered in the manner herein provided shall be conclusively presumed to have been duly given, whether or not the registered holder received the notice. In any case, failure duly to give such notice to the holder of any Note designated for redemption in whole or in part, or any defect in the notice, shall not affect the validity of the proceedings for the redemption of any other Note.

Each such notice of redemption shall specify the amount of Notes to be redeemed, the date fixed for redemption and the applicable redemption price at which the Notes to be redeemed are to be redeemed, and shall state that payment of the redemption price of such Notes to be redeemed will be made at the office or agency of the Issuer in the Borough of Manhattan, the City and State of New York, upon presentation and surrender of such Notes, that interest accrued to the date fixed for redemption will be paid as specified in said notice and, that from and after said date interest will cease to accrue.

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If the Trustee is to provide notice on behalf of the Issuer to the holders of the Notes as described herein, for a partial or full redemption, the Issuer shall give the Trustee at least 3 days’ notice in advance, a period which can be reduced upon further negotiation between the Issuer and the Trustee, of the date fixed for redemption as to the aggregate principal amount of Notes to be redeemed.

The Issuer may, if and whenever it shall so elect, by delivery of instructions signed on its behalf by its President or any Vice President, notify the Trustee that the Issuer has elected to call all or any part of the Notes for redemption and instruct the Trustee to give notice of redemption in the manner set forth in this Note, such notice to be in the name of the Issuer.

Subject to Section 2.11 of the Base Indenture, the Issuer shall not be required (i) to issue, register the transfer of or exchange any Notes during a period beginning at the opening of business 15 days before the day of the delivery of a notice of redemption of the Notes selected for redemption and ending at the close of business on the day of such delivery, or (ii) to register the transfer of or exchange any Notes so selected for redemption in whole or in part, except the unredeemed portion of any such Notes being redeemed in part.

If (A) the Issuer’s pending acquisition of TIH Blocker II, Inc., the parent company of McGriff Insurance Services, LLC (the “Transaction”) is not completed by the parties to that certain Agreement and Plan of Merger, dated as of September 29, 2024, by and among Marsh & McLennan Agency LLC, an indirect wholly-owned subsidiary of the Issuer, BD Merger Sub, Inc., TIH Blocker II, Inc. and TIH Platform Midco, L.P. (the “Merger Agreement”), on or prior to the later of (x) September 29, 2025 or (y) the date that is five Business Days after any later date to which the parties to the Merger Agreement may agree to extend the “Outside Date” in the Merger Agreement, (B) the Merger Agreement is terminated or (C) the Issuer notifies the Trustee, in writing, that it will not pursue the consummation of the Transaction (each, a “Special Mandatory Redemption Event”), then the Issuer shall redeem all of the Notes on the Special Mandatory Redemption Date at a special mandatory redemption price equal to 101% of the aggregate principal amount of the Notes to be redeemed, plus accrued and unpaid interest from and including the date of initial issuance, or the most recent date to which interest has been paid, whichever is later, to but not including the Special Mandatory Redemption Date (the “Special Mandatory Redemption Price”).

Upon the occurrence of a Special Mandatory Redemption Event, promptly, but in no event more than five Business Days, following such Special Mandatory Redemption Event, the Issuer shall deliver written notice to the Trustee of such special mandatory redemption and the date upon which such Special Mandatory Redemption Notes will be redeemed, which shall be no earlier than the fifth Business Day following the date of such notice (the “Special Mandatory Redemption Date”), and a notice to registered holders of the Notes that such Notes shall be redeemed and specifying the Special Mandatory Redemption Date and such other information as required, to the extent applicable, by the Base Indenture (the “Special Mandatory Redemption Notice”), which shall be delivered in the name and at the expense of the Issuer. The Trustee shall promptly mail or electronically deliver the Special Mandatory Redemption Notice, according to the procedures of The Depository Trust Company, to each registered holder of Notes to be redeemed at such holder’s registered address.

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If funds sufficient to pay the Special Mandatory Redemption Price of all of the Notes to be redeemed on the Special Mandatory Redemption Date are deposited with a Paying Agent or the Trustee on or before such Special Mandatory Redemption Date, then on and after such Special Mandatory Redemption Date, the Notes shall cease to bear interest and, other than the right to receive the Special Mandatory Redemption Price, all rights under the Notes shall terminate.

The Indenture contains provisions permitting the Issuer and the Trustee, with the consent of the holders of not less than a majority in aggregate principal amount of the Notes of all of the series at the time Outstanding affected thereby (all such series voting together as a single class), as defined in the Indenture, to execute supplemental indentures for the purpose of adding any provisions to or changing in any manner or eliminating any of the provisions of the Base Indenture or of any supplemental indenture or of modifying in any manner the rights of the holders of the Notes; provided, however, that no such supplemental indenture shall, without the consent of the holders of each Security then Outstanding and affected thereby (i) extend the fixed maturity of any Securities, including the Notes, or reduce the principal amount thereof, or reduce the rate or extend the time of payment of interest thereon, or reduce any premium payable upon the redemption thereof, or (ii) reduce the aforesaid percentage of Securities, the holders of which are required to consent to any such supplemental indenture. The Indenture also contains provisions permitting the holders of a majority in aggregate principal amount of the Notes of all series at the time Outstanding affected thereby (all such series voting together as a single class), to waive any past default in the performance of any of the covenants contained in the Base Indenture, or established pursuant to the Base Indenture with respect to such series, and its consequences, except a default in the payment of the principal of or premium, if any, or interest on any Securities, including the Notes, in which case, each such affected series voting as a separate class. Any such consent or waiver by the registered holder of this Note (unless revoked as provided in the Base Indenture) shall be conclusive and binding upon such holder and upon all future holders and owners of this Note and of any Note issued in exchange herefor or in place hereof (whether by registration of transfer or otherwise), irrespective of whether or not any notation of such consent or waiver is made upon this Note.

No reference herein to the Indenture and no provision of this Note or of the Indenture shall alter or impair the obligation of the Issuer, which is absolute and unconditional, to pay the principal of and premium, if any, and interest on this Note at the time and place and at the rate and in the money herein prescribed.

The Issuer is subject to certain covenants contained in the Indenture with respect to, and for the benefit of the holders of, the Notes. The Trustee shall not be obligated to monitor or confirm, on a continuing basis or otherwise, the Issuer’s compliance with the covenants contained in the Indenture or with respect to reports or other certificates filed under the Indenture; provided, however, that nothing herein shall relieve the Trustee of any obligations to

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monitor the Issuer’s timely delivery of all reports and certificates required under Section 5.03 of the Base Indenture and to fulfill its obligations under Article VII of the Indenture. If an Event of Default as defined in the Indenture with respect to the Notes shall occur and be continuing, the principal of the Notes may be declared due and payable in the manner and with the effect provided in the Indenture.

As provided in and subject to the provisions of the Indenture, the holder of this Note shall not have the right to institute any proceeding with respect to the Indenture or for the appointment of a receiver or Trustee or for any other remedy thereunder, unless such holder shall have previously given the Trustee written notice of a continuing Event of Default with respect to the Notes, the holders of not less than 25% in principal amount of the Outstanding Notes (in the case of an Event of Default described in clauses (a)(i) or (a)(ii) of Section 6.01 of the Base Indenture, each such series voting as a separate class, and in the case of an Event of Default described in clauses (a)(iii), (a)(iv), (a)(v) or (a)(vi) of Section 6.01 of the Base Indenture, all affected series voting together as a single class) shall have made written request to the Trustee to institute proceedings in respect of such Event of Default as Trustee and offered the Trustee reasonable indemnity and the Trustee shall have failed to institute any such proceeding for 60 days after receipt of such notice, request and offer of indemnity and the Trustee shall not have received from the holders of a majority in principal amount of the Notes at the time Outstanding (voting as provided in Section 6.04(b) of the Base Indenture) a direction inconsistent with such request. The foregoing shall not apply to any suit instituted by the holder of this Note for the enforcement of any payment of principal hereof or any interest on or after the respective due dates expressed herein.

As provided in the Indenture and subject to certain limitations therein set forth, this Note is transferable by the registered holder hereof on the Security Register of the Issuer, upon surrender of this Note for registration of transfer at the office or agency of the Issuer in the Borough of Manhattan, the City and State of New York accompanied by a written instrument or instruments of transfer in form satisfactory to the Issuer or the Trustee duly executed by the registered holder hereof or his attorney duly authorized in writing, and thereupon one or more new Notes of authorized denominations and for the same aggregate principal amount and series will be issued to the designated transferee or transferees. No service charge will be made for any such transfer, but the Issuer may require payment of a sum sufficient to cover any tax or other governmental charge payable in relation thereto.

Prior to due presentment for registration of transfer of this Note, the Issuer, the Trustee, any paying agent and any Security Registrar may deem and treat the registered holder hereof as the absolute owner hereof (whether or not this Note shall be overdue and notwithstanding any notice of ownership or writing hereon made by anyone other than the Security Registrar) for the purpose of receiving payment of or on account of the principal hereof and premium, if any, and interest due hereon and for all other purposes, and neither the Issuer nor the Trustee nor any paying agent nor any Note Registrar shall be affected by any notice to the contrary.

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No recourse shall be had for the payment of the principal of or the interest on this Note, or for any claim based hereon, or otherwise in respect hereof, or based on or in respect of the Indenture, against any incorporator, stockholder, officer or director, past, present or future, as such, of the Issuer or of any predecessor or successor corporation, whether by virtue of any constitution, statute or rule of law, or by the enforcement of any assessment or penalty or otherwise, all such liability being, by the acceptance hereof and as part of the consideration for the issuance hereof, expressly waived and released.

The Notes are issuable only in registered form without coupons in authorized denominations. As provided in the Indenture and subject to certain limitations herein and therein set forth, Notes so issued are exchangeable for a like aggregate principal amount of Notes of a different authorized denomination, as requested by the holder surrendering the same.

All terms used in this Note which are defined in the Indenture shall have the meanings assigned to them in the Indenture.

THE INDENTURE AND THE NOTES INCLUDING THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK.

Pursuant to a recommendation promulgated by the Committee on Uniform Security Identification Procedures, the Issuer has caused “CUSIP” numbers to be printed on the Notes as a convenience to the holders of the Notes. No representation is made as to the correctness or accuracy of such CUSIP numbers as printed on the Notes, and reliance may be placed only on the other identification numbers printed hereon.

Unless the certificate of authentication hereon has been executed by or on behalf of the Trustee by manual signature, which may be delivered via electronic transmission, this Note shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purposes.

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Exhibit E

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR SECURITIES IN DEFINITIVE FORM IN ACCORDANCE WITH THE PROVISIONS OF THE INDENTURE AND THE TERMS OF THE SECURITIES AND EXCEPT AS OTHERWISE PROVIDED IN SECTION 2.11 OF THE BASE INDENTURE, THIS NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY DTC TO A NOMINEE OF DTC OR BY A NOMINEE OF DTC TO DTC OR ANOTHER NOMINEE OF DTC OR BY DTC OR ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITARY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITARY.

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CUSIP No. 571748CE0

ISIN No. US571748CE09

MARSH & McLENNAN COMPANIES, INC.

5.350% Senior Notes due 2044

MARSH & McLENNAN COMPANIES, INC., a Delaware corporation (the “Issuer”, which term includes any successor corporation under the Indenture hereinafter referred to), for value received, hereby promises to pay to Cede & Co., or its registered assigns, the principal sum of [__________________] MILLION DOLLARS ($[__________]) (which aggregate principal amount may from time to time be increased or decreased to such other aggregate principal amounts by adjustments made on the Schedule of Increases or Decreases in Global Security attached hereto) on November 15, 2044 and to pay interest on said principal sum from November 8, 2024, or from the most recent interest payment date (each such date, an “Interest Payment Date”) to which interest has been paid or duly provided for semiannually on May 15 and November 15 of each year commencing May 15, 2025 at the rate of 5.350% per annum until the principal hereof shall have become due and payable, and on any overdue principal and premium, if any, and (without duplication and to the extent that payment of such interest is enforceable under applicable law) on any overdue installment of interest at the same rate per annum. The amount of interest payable on any Interest Payment Date shall be computed on the basis of a 360-day year of twelve 30-day months. In the event that any date on which interest is payable on this Note is not a Business Day, then payment of interest payable on such date will be made on the next succeeding day which is a Business Day (and without any interest or other payment in respect of any such delay). The interest installment so payable, and punctually paid or duly provided for, on any Interest Payment Date will, as provided in the Indenture (hereafter defined), be paid to the person in whose name this Note (or one or more Predecessor Securities, as defined in said Indenture) is registered at the close of business on the regular record date for such interest installment which shall be the April 30 and October 31 preceding such Interest Payment Date. Any such interest installment not punctually paid or duly provided for (as defined in the Indenture, the “Defaulted Interest”) shall forthwith cease to be payable to the registered holders on such regular record date, and may be paid to the person in whose name this Note (or one or more Predecessor Securities) is registered at the close of business on a special record date to be fixed by the Trustee for the payment of such Defaulted Interest, which shall not be more than 15 nor less than 10 days prior to the date of the proposed payment, and not less than 10 days after the receipt by the Trustee of the notice of the proposed payment or at any time in any other lawful manner not inconsistent with the requirements of any securities exchange on which the Notes may be listed, and upon such notice as may be required by such exchange, all as more fully provided in the Indenture. The principal of (and premium, if any) and the interest on this Note shall be payable at the office or agency of the Trustee maintained for that purpose in any coin or currency of the United States of America which at the time of payment is legal tender for

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payment of public and private debts; provided, however, that payment of interest may be made at the option of the Issuer by check mailed to the registered holder at such address as shall appear in the Security Register. Notwithstanding the foregoing, so long as the registered holder of this Note is Cede & Co., the payment of the principal of (and premium, if any) and interest on this Note will be made at such place and to such account as may be designated by DTC.

The indebtedness evidenced by this Note is, to the extent provided in the Indenture, senior and unsecured and will rank in right of payment on parity with all other senior unsecured obligations of the Issuer.

This Note shall not be entitled to any benefit under the Indenture hereinafter referred to or be valid until the Certificate of Authentication hereon shall have been signed manually by or on behalf of the Trustee.

The provisions of this Note are continued on the reverse side hereof and such continued provisions shall for all purposes have the same effect as though fully set forth at this place.

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IN WITNESS WHEREOF, the Issuer has caused this instrument to be executed.

Dated:

Attest:

[Signature Page to Global Note]

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CERTIFICATE OF AUTHENTICATION

This is one of the Notes of the series of Notes described in the within-mentioned Indenture.

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ASSIGNMENT FORM

FOR VALUE RECEIVED, the undersigned hereby

sells, assigns and transfers to

(Insert Social Security number or other identifying number of assignee)

(Please print or typewrite name and address, including zip code of assignee)

the within Note of Marsh & McLennan Companies, Inc. and hereby does irrevocably constitute and appoint

Attorney to transfer said Note on the books of the within-named Issuer with full power of substitution in the premises.

Signature(s) must be guaranteed by an eligible Guarantor Institution (banks, stock brokers, savings and loan associations and credit unions) with membership in an approved signature guarantee medallion program pursuant to Securities and Exchange Commission Rule 17Ad-15.

NOTICE: The signature to this assignment must correspond with the name as it appears on the first page of the within Note in every particular, without alteration or enlargement or any change whatever.

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SCHEDULE OF INCREASES OR DECREASES IN GLOBAL SECURITY

MARSH & McLENNAN COMPANIES, INC.

5.350% Senior Notes due 2044

The initial aggregate principal amount of this Global Security is $[_____________]. The following increases or decreases in this Global Security have been made:

No: _____

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MARSH & McLENNAN COMPANIES, INC.

5.350% Senior Notes due 2044

This Note is one of a duly authorized series of Securities (referred to in the Base Indenture (hereafter defined)), of the Issuer (herein sometimes referred to as the “Notes”), all such Securities issued or to be issued in one or more series under and pursuant to an indenture (the “Base Indenture”), dated as of July 15, 2011, between the Issuer and The Bank of New York Mellon, as Trustee (the “Trustee”), as supplemented in the case of the Notes by the Nineteenth Supplemental Indenture, dated as of November 8, 2024, between the Issuer and the Trustee (the Base Indenture, as so supplemented, the “Indenture”), to which Indenture and all indentures supplemental thereto reference is hereby made for a description of the rights, limitations of rights, obligations, duties and immunities thereunder of the Trustee, the Issuer and the holders of the Notes. This series of Notes is initially limited in aggregate principal amount as specified in said Nineteenth Supplemental Indenture. This series of Notes and any Additional Notes of this series shall constitute one series for all purposes under the Indenture, including without limitation, amendments, waivers and redemptions. The terms and conditions of this series of Notes and any Additional Notes of this series (other than the issue price, the date of issuance, the payment of interest accruing prior to the issue date of the Additional Notes and the first payment of interest following such issue date) shall be the same and shall bear the same CUSIP number.

Prior to May 15, 2044 (the “Par Call Date”), the Issuer may redeem the Notes, at its option, in whole or in part, at any time and from time to time, at a redemption price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of:

(1) (a) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the redemption date (assuming the Notes matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 15 basis points, less (b) interest accrued to the date of redemption, and

(2) 100% of the principal amount of the Notes to be redeemed,

plus, in either case, accrued and unpaid interest thereon to the redemption date.

On or after the Par Call Date, the Issuer may redeem the Notes, in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the Notes being redeemed plus accrued and unpaid interest thereon to the redemption date.

“Treasury Rate” means, with respect to any redemption date, the yield determined by the Issuer in accordance with the following two paragraphs.

The Treasury Rate shall be determined by the Issuer after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third Business Day preceding the redemption

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date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated as “Selected Interest Rates (Daily)—H.15” (or any successor designation or publication) (“H.15”) under the caption “U.S. government securities–Treasury constant maturities–Nominal” (or any successor caption or heading) (“H.15 TCM”). In determining the Treasury Rate, the Issuer shall select, as applicable: (1) the yield for the Treasury constant maturity on H.15 exactly equal to the period from the redemption date to the Par Call Date (the “Remaining Life”); or (2) if there is no such Treasury constant maturity on H.15 exactly equal to the Remaining Life, the two yields – one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one yield corresponding to the Treasury constant maturity on H.15 immediately longer than the Remaining Life – and shall interpolate to the Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal places; or (3) if there is no such Treasury constant maturity on H.15 shorter than or longer than the Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to the Remaining Life. For purposes of this paragraph, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal to the relevant number of months or years, as applicable, of such Treasury constant maturity from the redemption date.

If on the third Business Day preceding the redemption date H.15 TCM or any successor designation or publication is no longer published, the Issuer shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second Business Day preceding such redemption date of the United States Treasury security maturing on, or with a maturity that is closest to, the Par Call Date, as applicable. If there is no United States Treasury security maturing on the Par Call Date but there are two or more United States Treasury securities with a maturity date equally distant from the Par Call Date one with a maturity date preceding the Par Call Date and one with a maturity date following the Par Call Date, the Issuer shall select the United States Treasury security with a maturity date preceding the Par Call Date. If there are two or more United States Treasury securities maturing on the Par Call Date or two or more United States Treasury securities meeting the criteria of the preceding sentence, the Issuer shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places.

The Issuer’s actions and determinations in determining the redemption price shall be conclusive and binding for all purposes, absent manifest error.

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Notice of any redemption of Notes may, at the Issuer’s discretion, be given subject to one or more conditions precedent, including, but not limited to, completion of a corporate transaction that is pending. In such event, the related notice of redemption will describe each such condition and, if applicable, will state that, at the Issuer’s discretion, the redemption date may be delayed until such time (including more than 60 days after the notice of redemption was given) as any or all such conditions are satisfied (or waived by the Issuer in its sole discretion), or such redemption may not occur and such notice may be rescinded in the event that any or all such conditions have not been satisfied (or waived by the Issuer in its sole discretion) by the redemption date, or by the redemption date as so delayed. If any such redemption has been rescinded or delayed, the Issuer will provide written notice to the Trustee prior to the close of business two Business Days before the redemption date and, upon receipt, the Trustee will provide such notice to each registered holder.

In the case of a partial redemption, selection of the Notes for redemption will be made by the Trustee by lot. No Notes of a principal amount of $2,000 or less will be redeemed in part. If any Note is to be redeemed in part only, the notice of redemption that relates to the Note will state the portion of the principal amount of the Note to be redeemed. A new Note in a principal amount equal to the unredeemed portion of the Note will be issued in the name of the holder of the Note upon surrender for cancellation of the original Note. For so long as the Notes are held by the Depositary, the redemption of the Notes shall be done in accordance with the policies and procedures of the Depositary.

Unless the Issuer defaults in payment of the redemption price, on and after the redemption date interest will cease to accrue on the Notes or portions thereof called for redemption.

In case the Issuer shall desire to exercise its right to redeem all or, as the case may be, a portion of the Notes, the Issuer shall, or shall cause the Trustee to, give notice of such redemption to holders of the Notes to be redeemed. Notice of any redemption will be mailed or electronically delivered (or otherwise transmitted in accordance with the Depositary’s procedures) at least 10 days but not more than 60 days before the redemption date to each holder of Notes to be redeemed. Any notice that is delivered in the manner herein provided shall be conclusively presumed to have been duly given, whether or not the registered holder received the notice. In any case, failure duly to give such notice to the holder of any Note designated for redemption in whole or in part, or any defect in the notice, shall not affect the validity of the proceedings for the redemption of any other Note.

Each such notice of redemption shall specify the amount of Notes to be redeemed, the date fixed for redemption and the applicable redemption price at which the Notes to be redeemed are to be redeemed, and shall state that payment of the redemption price of such Notes to be redeemed will be made at the office or agency of the Issuer in the Borough of Manhattan, the City and State of New York, upon presentation and surrender of such Notes, that interest accrued to the date fixed for redemption will be paid as specified in said notice and, that from and after said date interest will cease to accrue.

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If the Trustee is to provide notice on behalf of the Issuer to the holders of the Notes as described herein, for a partial or full redemption, the Issuer shall give the Trustee at least 3 days’ notice in advance, a period which can be reduced upon further negotiation between the Issuer and the Trustee, of the date fixed for redemption as to the aggregate principal amount of Notes to be redeemed.

The Issuer may, if and whenever it shall so elect, by delivery of instructions signed on its behalf by its President or any Vice President, notify the Trustee that the Issuer has elected to call all or any part of the Notes for redemption and instruct the Trustee to give notice of redemption in the manner set forth in this Note, such notice to be in the name of the Issuer.

Subject to Section 2.11 of the Base Indenture, the Issuer shall not be required (i) to issue, register the transfer of or exchange any Notes during a period beginning at the opening of business 15 days before the day of the delivery of a notice of redemption of the Notes selected for redemption and ending at the close of business on the day of such delivery, or (ii) to register the transfer of or exchange any Notes so selected for redemption in whole or in part, except the unredeemed portion of any such Notes being redeemed in part.

If (A) the Issuer’s pending acquisition of TIH Blocker II, Inc., the parent company of McGriff Insurance Services, LLC (the “Transaction”) is not completed by the parties to that certain Agreement and Plan of Merger, dated as of September 29, 2024, by and among Marsh & McLennan Agency LLC, an indirect wholly-owned subsidiary of the Issuer, BD Merger Sub, Inc., TIH Blocker II, Inc. and TIH Platform Midco, L.P. (the “Merger Agreement”), on or prior to the later of (x) September 29, 2025 or (y) the date that is five Business Days after any later date to which the parties to the Merger Agreement may agree to extend the “Outside Date” in the Merger Agreement, (B) the Merger Agreement is terminated or (C) the Issuer notifies the Trustee, in writing, that it will not pursue the consummation of the Transaction (each, a “Special Mandatory Redemption Event”), then the Issuer shall redeem all of the Notes on the Special Mandatory Redemption Date at a special mandatory redemption price equal to 101% of the aggregate principal amount of the Notes to be redeemed, plus accrued and unpaid interest from and including the date of initial issuance, or the most recent date to which interest has been paid, whichever is later, to but not including the Special Mandatory Redemption Date (the “Special Mandatory Redemption Price”).

Upon the occurrence of a Special Mandatory Redemption Event, promptly, but in no event more than five Business Days, following such Special Mandatory Redemption Event, the Issuer shall deliver written notice to the Trustee of such special mandatory redemption and the date upon which such Special Mandatory Redemption Notes will be redeemed, which shall be no earlier than the fifth Business Day following the date of such notice (the “Special Mandatory Redemption Date”), and a notice to registered holders of the Notes that such Notes shall be redeemed and specifying the Special Mandatory Redemption Date and such other information as required, to the extent applicable, by the Base Indenture (the “Special Mandatory Redemption Notice”), which shall be delivered in the name and at the expense of the Issuer. The Trustee shall promptly mail or electronically deliver the Special Mandatory Redemption Notice, according to the procedures of The Depository Trust Company, to each registered holder of Notes to be redeemed at such holder’s registered address.

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If funds sufficient to pay the Special Mandatory Redemption Price of all of the Notes to be redeemed on the Special Mandatory Redemption Date are deposited with a Paying Agent or the Trustee on or before such Special Mandatory Redemption Date, then on and after such Special Mandatory Redemption Date, the Notes shall cease to bear interest and, other than the right to receive the Special Mandatory Redemption Price, all rights under the Notes shall terminate.

The Indenture contains provisions permitting the Issuer and the Trustee, with the consent of the holders of not less than a majority in aggregate principal amount of the Notes of all of the series at the time Outstanding affected thereby (all such series voting together as a single class), as defined in the Indenture, to execute supplemental indentures for the purpose of adding any provisions to or changing in any manner or eliminating any of the provisions of the Base Indenture or of any supplemental indenture or of modifying in any manner the rights of the holders of the Notes; provided, however, that no such supplemental indenture shall, without the consent of the holders of each Security then Outstanding and affected thereby (i) extend the fixed maturity of any Securities, including the Notes, or reduce the principal amount thereof, or reduce the rate or extend the time of payment of interest thereon, or reduce any premium payable upon the redemption thereof, or (ii) reduce the aforesaid percentage of Securities, the holders of which are required to consent to any such supplemental indenture. The Indenture also contains provisions permitting the holders of a majority in aggregate principal amount of the Notes of all series at the time Outstanding affected thereby (all such series voting together as a single class), to waive any past default in the performance of any of the covenants contained in the Base Indenture, or established pursuant to the Base Indenture with respect to such series, and its consequences, except a default in the payment of the principal of or premium, if any, or interest on any Securities, including the Notes, in which case, each such affected series voting as a separate class. Any such consent or waiver by the registered holder of this Note (unless revoked as provided in the Base Indenture) shall be conclusive and binding upon such holder and upon all future holders and owners of this Note and of any Note issued in exchange herefor or in place hereof (whether by registration of transfer or otherwise), irrespective of whether or not any notation of such consent or waiver is made upon this Note.

No reference herein to the Indenture and no provision of this Note or of the Indenture shall alter or impair the obligation of the Issuer, which is absolute and unconditional, to pay the principal of and premium, if any, and interest on this Note at the time and place and at the rate and in the money herein prescribed.

The Issuer is subject to certain covenants contained in the Indenture with respect to, and for the benefit of the holders of, the Notes. The Trustee shall not be obligated to monitor or confirm, on a continuing basis or otherwise, the Issuer’s compliance with the covenants contained in the Indenture or with respect to reports or other certificates filed under the Indenture; provided, however, that nothing herein shall relieve the Trustee of any obligations to

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monitor the Issuer’s timely delivery of all reports and certificates required under Section 5.03 of the Base Indenture and to fulfill its obligations under Article VII of the Indenture. If an Event of Default as defined in the Indenture with respect to the Notes shall occur and be continuing, the principal of the Notes may be declared due and payable in the manner and with the effect provided in the Indenture.

As provided in and subject to the provisions of the Indenture, the holder of this Note shall not have the right to institute any proceeding with respect to the Indenture or for the appointment of a receiver or Trustee or for any other remedy thereunder, unless such holder shall have previously given the Trustee written notice of a continuing Event of Default with respect to the Notes, the holders of not less than 25% in principal amount of the Outstanding Notes (in the case of an Event of Default described in clauses (a)(i) or (a)(ii) of Section 6.01 of the Base Indenture, each such series voting as a separate class, and in the case of an Event of Default described in clauses (a)(iii), (a)(iv), (a)(v) or (a)(vi) of Section 6.01 of the Base Indenture, all affected series voting together as a single class) shall have made written request to the Trustee to institute proceedings in respect of such Event of Default as Trustee and offered the Trustee reasonable indemnity and the Trustee shall have failed to institute any such proceeding for 60 days after receipt of such notice, request and offer of indemnity and the Trustee shall not have received from the holders of a majority in principal amount of the Notes at the time Outstanding (voting as provided in Section 6.04(b) of the Base Indenture) a direction inconsistent with such request. The foregoing shall not apply to any suit instituted by the holder of this Note for the enforcement of any payment of principal hereof or any interest on or after the respective due dates expressed herein.

As provided in the Indenture and subject to certain limitations therein set forth, this Note is transferable by the registered holder hereof on the Security Register of the Issuer, upon surrender of this Note for registration of transfer at the office or agency of the Issuer in the Borough of Manhattan, the City and State of New York accompanied by a written instrument or instruments of transfer in form satisfactory to the Issuer or the Trustee duly executed by the registered holder hereof or his attorney duly authorized in writing, and thereupon one or more new Notes of authorized denominations and for the same aggregate principal amount and series will be issued to the designated transferee or transferees. No service charge will be made for any such transfer, but the Issuer may require payment of a sum sufficient to cover any tax or other governmental charge payable in relation thereto.

Prior to due presentment for registration of transfer of this Note, the Issuer, the Trustee, any paying agent and any Security Registrar may deem and treat the registered holder hereof as the absolute owner hereof (whether or not this Note shall be overdue and notwithstanding any notice of ownership or writing hereon made by anyone other than the Security Registrar) for the purpose of receiving payment of or on account of the principal hereof and premium, if any, and interest due hereon and for all other purposes, and neither the Issuer nor the Trustee nor any paying agent nor any Note Registrar shall be affected by any notice to the contrary.

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No recourse shall be had for the payment of the principal of or the interest on this Note, or for any claim based hereon, or otherwise in respect hereof, or based on or in respect of the Indenture, against any incorporator, stockholder, officer or director, past, present or future, as such, of the Issuer or of any predecessor or successor corporation, whether by virtue of any constitution, statute or rule of law, or by the enforcement of any assessment or penalty or otherwise, all such liability being, by the acceptance hereof and as part of the consideration for the issuance hereof, expressly waived and released.

The Notes are issuable only in registered form without coupons in authorized denominations. As provided in the Indenture and subject to certain limitations herein and therein set forth, Notes so issued are exchangeable for a like aggregate principal amount of Notes of a different authorized denomination, as requested by the holder surrendering the same.

All terms used in this Note which are defined in the Indenture shall have the meanings assigned to them in the Indenture.

THE INDENTURE AND THE NOTES INCLUDING THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK.

Pursuant to a recommendation promulgated by the Committee on Uniform Security Identification Procedures, the Issuer has caused “CUSIP” numbers to be printed on the Notes as a convenience to the holders of the Notes. No representation is made as to the correctness or accuracy of such CUSIP numbers as printed on the Notes, and reliance may be placed only on the other identification numbers printed hereon.

Unless the certificate of authentication hereon has been executed by or on behalf of the Trustee by manual signature, which may be delivered via electronic transmission, this Note shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purposes.

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Exhibit F

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR SECURITIES IN DEFINITIVE FORM IN ACCORDANCE WITH THE PROVISIONS OF THE INDENTURE AND THE TERMS OF THE SECURITIES AND EXCEPT AS OTHERWISE PROVIDED IN SECTION 2.11 OF THE BASE INDENTURE, THIS NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY DTC TO A NOMINEE OF DTC OR BY A NOMINEE OF DTC TO DTC OR ANOTHER NOMINEE OF DTC OR BY DTC OR ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITARY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITARY.

F-1

CUSIP No. 571748CD2

ISIN No. US571748CD26

MARSH & McLENNAN COMPANIES, INC.

5.400% Senior Notes due 2055

MARSH & McLENNAN COMPANIES, INC., a Delaware corporation (the “Issuer”, which term includes any successor corporation under the Indenture hereinafter referred to), for value received, hereby promises to pay to Cede & Co., or its registered assigns, the principal sum of [__________________] MILLION DOLLARS ($[__________]) (which aggregate principal amount may from time to time be increased or decreased to such other aggregate principal amounts by adjustments made on the Schedule of Increases or Decreases in Global Security attached hereto) on March 15, 2055 and to pay interest on said principal sum from November 8, 2024, or from the most recent interest payment date (each such date, an “Interest Payment Date”) to which interest has been paid or duly provided for semiannually on March 15 and September 15 of each year commencing March 15, 2025 at the rate of 5.400% per annum until the principal hereof shall have become due and payable, and on any overdue principal and premium, if any, and (without duplication and to the extent that payment of such interest is enforceable under applicable law) on any overdue installment of interest at the same rate per annum. The amount of interest payable on any Interest Payment Date shall be computed on the basis of a 360-day year of twelve 30-day months. In the event that any date on which interest is payable on this Note is not a Business Day, then payment of interest payable on such date will be made on the next succeeding day which is a Business Day (and without any interest or other payment in respect of any such delay). The interest installment so payable, and punctually paid or duly provided for, on any Interest Payment Date will, as provided in the Indenture (hereafter defined), be paid to the person in whose name this Note (or one or more Predecessor Securities, as defined in said Indenture) is registered at the close of business on the regular record date for such interest installment which shall be the February 28 (or, in the case of a leap year, February 29) and August 31 preceding such Interest Payment Date. Any such interest installment not punctually paid or duly provided for (as defined in the Indenture, the “Defaulted Interest”) shall forthwith cease to be payable to the registered holders on such regular record date, and may be paid to the person in whose name this Note (or one or more Predecessor Securities) is registered at the close of business on a special record date to be fixed by the Trustee for the payment of such Defaulted Interest, which shall not be more than 15 nor less than 10 days prior to the date of the proposed payment, and not less than 10 days after the receipt by the Trustee of the notice of the proposed payment or at any time in any other lawful manner not inconsistent with the requirements of any securities exchange on which the Notes may be listed, and upon such notice as may be required by such exchange, all as more fully provided in the Indenture. The principal of (and premium, if any) and the interest on this Note shall be payable at the office or agency of the Trustee maintained for that purpose in any coin or currency of the United States of America which at the time of payment is legal tender for payment of public and private debts; provided,

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however, that payment of interest may be made at the option of the Issuer by check mailed to the registered holder at such address as shall appear in the Security Register. Notwithstanding the foregoing, so long as the registered holder of this Note is Cede & Co., the payment of the principal of (and premium, if any) and interest on this Note will be made at such place and to such account as may be designated by DTC.

The indebtedness evidenced by this Note is, to the extent provided in the Indenture, senior and unsecured and will rank in right of payment on parity with all other senior unsecured obligations of the Issuer.

This Note shall not be entitled to any benefit under the Indenture hereinafter referred to or be valid until the Certificate of Authentication hereon shall have been signed manually by or on behalf of the Trustee.

The provisions of this Note are continued on the reverse side hereof and such continued provisions shall for all purposes have the same effect as though fully set forth at this place.

F-3

IN WITNESS WHEREOF, the Issuer has caused this instrument to be executed.

Dated:

Attest:

[Signature Page to Global Note]

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CERTIFICATE OF AUTHENTICATION

This is one of the Notes of the series of Notes described in the within-mentioned Indenture.

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ASSIGNMENT FORM

FOR VALUE RECEIVED, the undersigned hereby

sells, assigns and transfers to

(Insert Social Security number or other identifying number of assignee)

(Please print or typewrite name and address, including zip code of assignee)

the within Note of Marsh & McLennan Companies, Inc. and hereby does irrevocably constitute and appoint

Attorney to transfer said Note on the books of the within-named Issuer with full power of substitution in the premises.

Signature(s) must be guaranteed by an eligible Guarantor Institution (banks, stock brokers, savings and loan associations and credit unions) with membership in an approved signature guarantee medallion program pursuant to Securities and Exchange Commission Rule 17Ad-15.

NOTICE: The signature to this assignment must correspond with the name as it appears on the first page of the within Note in every particular, without alteration or enlargement or any change whatever.

F-6

SCHEDULE OF INCREASES OR DECREASES IN GLOBAL SECURITY

MARSH & McLENNAN COMPANIES, INC.

5.400% Senior Notes due 2055

The initial aggregate principal amount of this Global Security is $[_____________]. The following increases or decreases in this Global Security have been made:

No: _____

F-7

MARSH & McLENNAN COMPANIES, INC.

5.400% Senior Notes due 2055

This Note is one of a duly authorized series of Securities (referred to in the Base Indenture (hereafter defined)), of the Issuer (herein sometimes referred to as the “Notes”), all such Securities issued or to be issued in one or more series under and pursuant to an indenture (the “Base Indenture”), dated as of July 15, 2011, between the Issuer and The Bank of New York Mellon, as Trustee (the “Trustee”), as supplemented in the case of the Notes by the Nineteenth Supplemental Indenture, dated as of November 8, 2024, between the Issuer and the Trustee (the Base Indenture, as so supplemented, the “Indenture”), to which Indenture and all indentures supplemental thereto reference is hereby made for a description of the rights, limitations of rights, obligations, duties and immunities thereunder of the Trustee, the Issuer and the holders of the Notes. This series of Notes is initially limited in aggregate principal amount as specified in said Nineteenth Supplemental Indenture. This series of Notes and any Additional Notes of this series shall constitute one series for all purposes under the Indenture, including without limitation, amendments, waivers and redemptions. The terms and conditions of this series of Notes and any Additional Notes of this series (other than the issue price, the date of issuance, the payment of interest accruing prior to the issue date of the Additional Notes and the first payment of interest following such issue date) shall be the same and shall bear the same CUSIP number.

Prior to September 15, 2054 (the “Par Call Date”), the Issuer may redeem the Notes, at its option, in whole or in part, at any time and from time to time, at a redemption price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of:

(1) (a) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the redemption date (assuming the Notes matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 15 basis points, less (b) interest accrued to the date of redemption, and

(2) 100% of the principal amount of the Notes to be redeemed,

plus, in either case, accrued and unpaid interest thereon to the redemption date.

On or after the Par Call Date, the Issuer may redeem the Notes, in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the Notes being redeemed plus accrued and unpaid interest thereon to the redemption date.

“Treasury Rate” means, with respect to any redemption date, the yield determined by the Issuer in accordance with the following two paragraphs.

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The Treasury Rate shall be determined by the Issuer after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third Business Day preceding the redemption date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated as “Selected Interest Rates (Daily)—H.15” (or any successor designation or publication) (“H.15”) under the caption “U.S. government securities–Treasury constant maturities–Nominal” (or any successor caption or heading) (“H.15 TCM”). In determining the Treasury Rate, the Issuer shall select, as applicable: (1) the yield for the Treasury constant maturity on H.15 exactly equal to the period from the redemption date to the Par Call Date (the “Remaining Life”); or (2) if there is no such Treasury constant maturity on H.15 exactly equal to the Remaining Life, the two yields – one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one yield corresponding to the Treasury constant maturity on H.15 immediately longer than the Remaining Life – and shall interpolate to the Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal places; or (3) if there is no such Treasury constant maturity on H.15 shorter than or longer than the Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to the Remaining Life. For purposes of this paragraph, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal to the relevant number of months or years, as applicable, of such Treasury constant maturity from the redemption date.

If on the third Business Day preceding the redemption date H.15 TCM or any successor designation or publication is no longer published, the Issuer shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second Business Day preceding such redemption date of the United States Treasury security maturing on, or with a maturity that is closest to, the Par Call Date, as applicable. If there is no United States Treasury security maturing on the Par Call Date but there are two or more United States Treasury securities with a maturity date equally distant from the Par Call Date one with a maturity date preceding the Par Call Date and one with a maturity date following the Par Call Date, the Issuer shall select the United States Treasury security with a maturity date preceding the Par Call Date. If there are two or more United States Treasury securities maturing on the Par Call Date or two or more United States Treasury securities meeting the criteria of the preceding sentence, the Issuer shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places.

The Issuer’s actions and determinations in determining the redemption price shall be conclusive and binding for all purposes, absent manifest error.

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Notice of any redemption of Notes may, at the Issuer’s discretion, be given subject to one or more conditions precedent, including, but not limited to, completion of a corporate transaction that is pending. In such event, the related notice of redemption will describe each such condition and, if applicable, will state that, at the Issuer’s discretion, the redemption date may be delayed until such time (including more than 60 days after the notice of redemption was given) as any or all such conditions are satisfied (or waived by the Issuer in its sole discretion), or such redemption may not occur and such notice may be rescinded in the event that any or all such conditions have not been satisfied (or waived by the Issuer in its sole discretion) by the redemption date, or by the redemption date as so delayed. If any such redemption has been rescinded or delayed, the Issuer will provide written notice to the Trustee prior to the close of business two Business Days before the redemption date and, upon receipt, the Trustee will provide such notice to each registered holder.

In the case of a partial redemption, selection of the Notes for redemption will be made by the Trustee by lot. No Notes of a principal amount of $2,000 or less will be redeemed in part. If any Note is to be redeemed in part only, the notice of redemption that relates to the Note will state the portion of the principal amount of the Note to be redeemed. A new Note in a principal amount equal to the unredeemed portion of the Note will be issued in the name of the holder of the Note upon surrender for cancellation of the original Note. For so long as the Notes are held by the Depositary, the redemption of the Notes shall be done in accordance with the policies and procedures of the Depositary.

Unless the Issuer defaults in payment of the redemption price, on and after the redemption date interest will cease to accrue on the Notes or portions thereof called for redemption.

In case the Issuer shall desire to exercise its right to redeem all or, as the case may be, a portion of the Notes, the Issuer shall, or shall cause the Trustee to, give notice of such redemption to holders of the Notes to be redeemed. Notice of any redemption will be mailed or electronically delivered (or otherwise transmitted in accordance with the Depositary’s procedures) at least 10 days but not more than 60 days before the redemption date to each holder of Notes to be redeemed. Any notice that is delivered in the manner herein provided shall be conclusively presumed to have been duly given, whether or not the registered holder received the notice. In any case, failure duly to give such notice to the holder of any Note designated for redemption in whole or in part, or any defect in the notice, shall not affect the validity of the proceedings for the redemption of any other Note.

Each such notice of redemption shall specify the amount of Notes to be redeemed, the date fixed for redemption and the applicable redemption price at which the Notes to be redeemed are to be redeemed, and shall state that payment of the redemption price of such Notes to be redeemed will be made at the office or agency of the Issuer in the Borough of Manhattan, the City and State of New York, upon presentation and surrender of such Notes, that interest accrued to the date fixed for redemption will be paid as specified in said notice and, that from and after said date interest will cease to accrue.

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If the Trustee is to provide notice on behalf of the Issuer to the holders of the Notes as described herein, for a partial or full redemption, the Issuer shall give the Trustee at least 3 days’ notice in advance, a period which can be reduced upon further negotiation between the Issuer and the Trustee, of the date fixed for redemption as to the aggregate principal amount of Notes to be redeemed.

The Issuer may, if and whenever it shall so elect, by delivery of instructions signed on its behalf by its President or any Vice President, notify the Trustee that the Issuer has elected to call all or any part of the Notes for redemption and instruct the Trustee to give notice of redemption in the manner set forth in this Note, such notice to be in the name of the Issuer.

Subject to Section 2.11 of the Base Indenture, the Issuer shall not be required (i) to issue, register the transfer of or exchange any Notes during a period beginning at the opening of business 15 days before the day of the delivery of a notice of redemption of the Notes selected for redemption and ending at the close of business on the day of such delivery, or (ii) to register the transfer of or exchange any Notes so selected for redemption in whole or in part, except the unredeemed portion of any such Notes being redeemed in part.

The Indenture contains provisions permitting the Issuer and the Trustee, with the consent of the holders of not less than a majority in aggregate principal amount of the Notes of all of the series at the time Outstanding affected thereby (all such series voting together as a single class), as defined in the Indenture, to execute supplemental indentures for the purpose of adding any provisions to or changing in any manner or eliminating any of the provisions of the Base Indenture or of any supplemental indenture or of modifying in any manner the rights of the holders of the Notes; provided, however, that no such supplemental indenture shall, without the consent of the holders of each Security then Outstanding and affected thereby (i) extend the fixed maturity of any Securities, including the Notes, or reduce the principal amount thereof, or reduce the rate or extend the time of payment of interest thereon, or reduce any premium payable upon the redemption thereof, or (ii) reduce the aforesaid percentage of Securities, the holders of which are required to consent to any such supplemental indenture. The Indenture also contains provisions permitting the holders of a majority in aggregate principal amount of the Notes of all series at the time Outstanding affected thereby (all such series voting together as a single class), to waive any past default in the performance of any of the covenants contained in the Base Indenture, or established pursuant to the Base Indenture with respect to such series, and its consequences, except a default in the payment of the principal of or premium, if any, or interest on any Securities, including the Notes, in which case, each such affected series voting as a separate class. Any such consent or waiver by the registered holder of this Note (unless revoked as provided in the Base Indenture) shall be conclusive and binding upon such holder and upon all future holders and owners of this Note and of any Note issued in exchange herefor or in place hereof (whether by registration of transfer or otherwise), irrespective of whether or not any notation of such consent or waiver is made upon this Note.

No reference herein to the Indenture and no provision of this Note or of the Indenture shall alter or impair the obligation of the Issuer, which is absolute and unconditional, to pay the principal of and premium, if any, and interest on this Note at the time and place and at the rate and in the money herein prescribed.

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The Issuer is subject to certain covenants contained in the Indenture with respect to, and for the benefit of the holders of, the Notes. The Trustee shall not be obligated to monitor or confirm, on a continuing basis or otherwise, the Issuer’s compliance with the covenants contained in the Indenture or with respect to reports or other certificates filed under the Indenture; provided, however, that nothing herein shall relieve the Trustee of any obligations to monitor the Issuer’s timely delivery of all reports and certificates required under Section 5.03 of the Base Indenture and to fulfill its obligations under Article VII of the Indenture. If an Event of Default as defined in the Indenture with respect to the Notes shall occur and be continuing, the principal of the Notes may be declared due and payable in the manner and with the effect provided in the Indenture.

As provided in and subject to the provisions of the Indenture, the holder of this Note shall not have the right to institute any proceeding with respect to the Indenture or for the appointment of a receiver or Trustee or for any other remedy thereunder, unless such holder shall have previously given the Trustee written notice of a continuing Event of Default with respect to the Notes, the holders of not less than 25% in principal amount of the Outstanding Notes (in the case of an Event of Default described in clauses (a)(i) or (a)(ii) of Section 6.01 of the Base Indenture, each such series voting as a separate class, and in the case of an Event of Default described in clauses (a)(iii), (a)(iv), (a)(v) or (a)(vi) of Section 6.01 of the Base Indenture, all affected series voting together as a single class) shall have made written request to the Trustee to institute proceedings in respect of such Event of Default as Trustee and offered the Trustee reasonable indemnity and the Trustee shall have failed to institute any such proceeding for 60 days after receipt of such notice, request and offer of indemnity and the Trustee shall not have received from the holders of a majority in principal amount of the Notes at the time Outstanding (voting as provided in Section 6.04(b) of the Base Indenture) a direction inconsistent with such request. The foregoing shall not apply to any suit instituted by the holder of this Note for the enforcement of any payment of principal hereof or any interest on or after the respective due dates expressed herein.

As provided in the Indenture and subject to certain limitations therein set forth, this Note is transferable by the registered holder hereof on the Security Register of the Issuer, upon surrender of this Note for registration of transfer at the office or agency of the Issuer in the Borough of Manhattan, the City and State of New York accompanied by a written instrument or instruments of transfer in form satisfactory to the Issuer or the Trustee duly executed by the registered holder hereof or his attorney duly authorized in writing, and thereupon one or more new Notes of authorized denominations and for the same aggregate principal amount and series will be issued to the designated transferee or transferees. No service charge will be made for any such transfer, but the Issuer may require payment of a sum sufficient to cover any tax or other governmental charge payable in relation thereto.

Prior to due presentment for registration of transfer of this Note, the Issuer, the Trustee, any paying agent and any Security Registrar may deem and treat the registered holder hereof as the absolute owner hereof (whether or not this Note shall be overdue and notwithstanding any notice of ownership or writing hereon made by anyone other than the Security Registrar) for the purpose of receiving payment of or on account of the principal hereof and premium, if any, and interest due hereon and for all other purposes, and neither the Issuer nor the Trustee nor any paying agent nor any Note Registrar shall be affected by any notice to the contrary.

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No recourse shall be had for the payment of the principal of or the interest on this Note, or for any claim based hereon, or otherwise in respect hereof, or based on or in respect of the Indenture, against any incorporator, stockholder, officer or director, past, present or future, as such, of the Issuer or of any predecessor or successor corporation, whether by virtue of any constitution, statute or rule of law, or by the enforcement of any assessment or penalty or otherwise, all such liability being, by the acceptance hereof and as part of the consideration for the issuance hereof, expressly waived and released.

The Notes are issuable only in registered form without coupons in authorized denominations. As provided in the Indenture and subject to certain limitations herein and therein set forth, Notes so issued are exchangeable for a like aggregate principal amount of Notes of a different authorized denomination, as requested by the holder surrendering the same.

All terms used in this Note which are defined in the Indenture shall have the meanings assigned to them in the Indenture.

THE INDENTURE AND THE NOTES INCLUDING THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK.

Pursuant to a recommendation promulgated by the Committee on Uniform Security Identification Procedures, the Issuer has caused “CUSIP” numbers to be printed on the Notes as a convenience to the holders of the Notes. No representation is made as to the correctness or accuracy of such CUSIP numbers as printed on the Notes, and reliance may be placed only on the other identification numbers printed hereon.

Unless the certificate of authentication hereon has been executed by or on behalf of the Trustee by manual signature, which may be delivered via electronic transmission, this Note shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purposes.

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Exhibit G

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR SECURITIES IN DEFINITIVE FORM IN ACCORDANCE WITH THE PROVISIONS OF THE INDENTURE AND THE TERMS OF THE SECURITIES AND EXCEPT AS OTHERWISE PROVIDED IN SECTION 2.11 OF THE BASE INDENTURE, THIS NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY DTC TO A NOMINEE OF DTC OR BY A NOMINEE OF DTC TO DTC OR ANOTHER NOMINEE OF DTC OR BY DTC OR ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITARY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITARY.

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MARSH & McLENNAN COMPANIES, INC.

Floating Rate Senior Notes due 2027

MARSH & McLENNAN COMPANIES, INC., a Delaware corporation (the “Issuer”, which term includes any successor corporation under the Indenture hereinafter referred to), for value received, hereby promises to pay to Cede & Co., or its registered assigns, the principal sum of [      ] MILLION DOLLARS ($[    ]) (which aggregate principal amount may from time to time be increased or decreased to such other aggregate principal amounts by adjustments made on the Schedule of Increases or Decreases in Global Security attached hereto) on November 8, 2027 and to pay interest on said principal sum from November 8, 2024, or from the most recent interest payment date (each such date, a “Floating Rate Interest Payment Date”) to which interest has been paid or duly provided for quarterly on February 8, May 8, August 8 and November 8 of each year commencing February 8, 2025 at a floating rate, reset quarterly, equal to Compounded SOFR, plus 0.700%, computed as set forth below, until the principal hereof shall have become due and payable, and on any overdue principal and premium, if any, and (without duplication and to the extent that payment of such interest is enforceable under applicable law) on any overdue installment of interest at the same rate per annum. The basis upon which interest on this Note shall be calculated shall be that of the actual number of calendar days elapsed over a 360-day year. In the event any February 8, May 8, August 8 or November 8 is not a Business Day, then the next succeeding Business Day will be the applicable Floating Rate Interest Payment Date and interest on this Note will be paid on such next succeeding Business Day (unless such next succeeding Business Day falls in the succeeding calendar month, in which case the applicable Floating Rate Interest Payment Date shall be the Business Day immediately preceding such February 8, May 8, August 8 or November 8, and interest on this Note shall be paid on such immediately preceding Business Day) (and without any interest or other payment in respect of any such delay). The interest installment so payable, and punctually paid or duly provided for, on any Floating Rate Interest Payment Date will, as provided in the Indenture (hereafter defined), be paid to the person in whose name this Note (or one or more Predecessor Securities, as defined in said Indenture) is registered at the close of business on the record date for such interest installment which shall be the January 24, April 23, July 24 and October 24 preceding such Floating Rate Interest Payment Date. Any such interest installment not punctually paid or duly provided for (as defined in the Indenture, the “Defaulted Interest”) shall forthwith cease to be payable to the registered holders on such regular record date, and may be paid to the person in whose name this Note (or one or more Predecessor Securities) is registered at the close of business on a special record date to be fixed by the Trustee for the payment of such Defaulted Interest, which shall not be more than 15 nor less than 10 days prior to the date of the proposed payment, and not less than 10 days after the receipt by the Trustee of the notice of the proposed payment or at any time in any other lawful manner not

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inconsistent with the requirements of any securities exchange on which the Notes may be listed, and upon such notice as may be required by such exchange, all as more fully provided in the Indenture. The principal of (and premium, if any) and the interest on this Note shall be payable at the office or agency of the Trustee maintained for that purpose in any coin or currency of the United States of America which at the time of payment is legal tender for payment of public and private debts; provided, however, that payment of interest may be made at the option of the Issuer by check mailed to the registered holder at such address as shall appear in the Security Register. Notwithstanding the foregoing, so long as the registered holder of this Note is Cede & Co., the payment of the principal of (and premium, if any) and interest on this Note will be made at such place and to such account as may be designated by DTC.

The rate at which the Notes shall bear interest shall be as determined by the Calculation Agent as set forth below, subject to the maximum interest rate permitted by New York law (as the same may be modified by United States law of general application). Interest on the Notes for any Interest Period (other than the Initial Interest Period) shall be at a floating rate, reset quarterly, equal to Compounded SOFR plus 0.700%.

The interest rate for the Initial Interest Period shall be Compounded SOFR as determined on November 6, 2024, plus 0.700%. Thereafter, the interest rate for any Interest Period will be Compounded SOFR, as determined on the applicable date that is the second U.S. Government Securities Business Day preceding such Floating Rate Interest Payment Date (the “Interest Determination Date”), plus a margin of 0.700%.

The amount of interest accrued and payable on the Notes for each Interest Period will be equal to the product of (i) the outstanding principal amount of the Notes multiplied by (ii) the product of (a) the interest rate for the relevant Interest Period multiplied by (b) the quotient of the actual number of calendar days in such Interest Period divided by 360.

The Calculation Agent shall calculate the interest rate in accordance with the foregoing. The Calculation Agent’s determination of any interest rate and its calculation of the amount of interest for any Floating Rate Interest Period will be final and binding in the absence of manifest error. All percentages resulting from any calculation are to be rounded to the nearest one hundred-thousandth of a percentage point, with five one-millionths of a percentage point rounded upward. Dollar amounts used in the calculation are to be rounded to the nearest cent (with one-half cent being rounded upward).

“Calculation Agent” shall initially mean The Bank of New York Mellon, or any successor appointed from time to time by the Company, acting as Calculation Agent.

“Compounded SOFR” means, with respect to any Interest Period, the rate computed in accordance with the following formula set forth below:

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where:

“SOFR Index_Start” is the SOFR Index value for the day that is two U.S. Government Securities Business Days preceding the first date of the relevant Interest Period;

“SOFR Index_End” is the SOFR Index value for the day that is two U.S. Government Securities Business Days preceding the Latter Floating Rate Interest Payment Date relating to such Interest Period; and

“d_c” is the actual number of calendar days from (and including) SOFR Index_Start to (but excluding) SOFR Index_End (the actual number of calendar days in the applicable Observation Period).

“Initial Interest Period” means the period from and including the date of the Nineteenth Supplemental Indenture to, but excluding, the first Floating Rate Interest Payment Date.

“Interest Period” means, after the Initial Interest Period, the period from and including a Floating Rate Interest Payment Date to, but excluding, the immediately succeeding Floating Rate Interest Payment Date (such succeeding Floating Rate Interest Payment Date, the “Latter Floating Rate Interest Payment Date”); provided that the final interest period for the Notes will be the period from and including the Floating Rate Interest Payment Date immediately preceding the stated maturity date of the Notes to, but excluding, the maturity date.

“New York Federal Reserve” means the Federal Reserve Bank of New York (or a successor administrator of the Secured Overnight Financing Rate).

“New York Federal Reserve’s Website” means the website of the New York Federal Reserve, currently at http://www.newyorkfed.org, or any successor source.

“Observation Period” means, in respect of each Interest Period, the period from and including the day that is two U.S. Government Securities Business Days preceding the first date of such relevant Interest Period to but excluding the day that is two U.S. Government Securities Business Days preceding the Latter Floating Rate Interest Payment Date for such Interest Period; provided that the first Observation Period shall be the period from and including the day that is two U.S. Government Securities Business Days preceding the date of the Nineteenth Supplemental Indenture to, but excluding, the day that is the two U.S. Government Securities Business Days preceding the first Floating Rate Interest Payment Date.

“Secured Overnight Financing Rate” means the daily secured overnight financing rate as provided by the New York Federal Reserve on the New York Federal Reserve’s Website.

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“SOFR Index” means, with respect to any U.S. Government Securities Business Day:

(1) the SOFR Index value as published by the New York Federal Reserve as such index appears on the New York Federal Reserve’s Website at 3:00 p.m. (New York time) on such U.S. Government Securities Business Day (the “SOFR Determination Time”); provided that:

(2) if a SOFR Index value does not so appear as specified in clause (1) above at the SOFR Determination Time, then:

(i) if a Benchmark Transition Event and its related Benchmark Replacement Date (each as defined herein) have not occurred with respect to SOFR, then Compounded SOFR shall be the rate determined pursuant to the “SOFR Index Unavailable” provisions described below; or

(ii) if a Benchmark Transition Event and its related Benchmark Replacement Date have occurred with respect to SOFR, then Compounded SOFR shall be the rate determined pursuant to the “Effect of a Benchmark Transition Event” provisions described below.

“U.S. Government Securities Business Day” means any day except for a Saturday, Sunday or a day on which the Securities Industry and Financial Markets Association recommends that the fixed income departments of its members be closed for the entire day for purposes of trading in U.S. government securities.

If a SOFR Index_Start or SOFR Index_End is not published on the associated Interest Determination Date and a Benchmark Transition Event and its related Benchmark Replacement Date have not occurred with respect to the Secured Overnight Financing Rate, “Compounded SOFR” means, for the applicable Interest Period for which such index is not available, the rate of return on a daily compounded interest investment calculated in accordance with the formula for SOFR Averages, and definitions required for such formula, published on the New York Federal Reserve’s Website at https://www.newyorkfed.org/markets/treasury-repo-reference-rates-information. For the purposes of this provision, references in the SOFR Averages compounding formula and related definitions to “calculation period” shall be replaced with “Observation Period” and the words “that is, 30-, 90-, or 180- calendar days” shall be removed. If the daily Secured Overnight Financing Rate (“SOFR_i”) does not so appear for any day, “_i” in the Observation Period, SOFR_i for such day “_i” shall be SOFR published in respect of the first preceding U.S. Government Securities Business Day for which the Secured Overnight Financing Rate was published on the New York Federal Reserve’s Website.

If the Issuer or its designee determine on or prior to the relevant Reference Time that a Benchmark Transition Event and its related Benchmark Replacement Date have occurred with respect to the then-current Benchmark, the Benchmark Replacement shall replace the then-current Benchmark for all purposes relating to the Notes in respect of all determinations on such date and for all determinations on all subsequent dates.

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In connection with the implementation of a Benchmark Replacement, the Issuer or its designee shall have the right to make Benchmark Replacement Conforming Changes from time to time.

Any determination, decision or election that may be made by the Issuer or its designee pursuant to this Section 1.01(k), including a determination with respect to a tenor, rate or adjustment or of the occurrence or non-occurrence of an event, circumstance or date and any decision to take or refrain from taking any action or any selection:

(1) will be conclusive and binding absent manifest error;

(2) will be made in the Issuer’s or its designee’s sole discretion (and in no event shall the Calculation Agent be responsible for making any such determination, decision or election); and

(3) notwithstanding anything to the contrary in the documentation relating to the Notes, shall become effective without consent from the holders of the Notes or any other party.

For the avoidance of doubt, if the event that gives rise to the Benchmark Replacement Date occurs on the same day as, but earlier than, the Reference Time in respect of any determination, the Benchmark Replacement Date will be deemed to have occurred prior to the Reference Time for such determination.

For the avoidance of doubt, for purposes of the definitions of Benchmark Replacement Date and Benchmark Transition Event, references to Benchmark also include any reference rate underlying such Benchmark.

“Benchmark” means, initially, Compounded SOFR, as such term is defined above; provided that if the Issuer or its designee determines on or prior to the Reference Time that a Benchmark Transition Event and its related Benchmark Replacement Date have occurred with respect to Compounded SOFR (or the published daily SOFR Index used in the calculation thereof) or the then-current Benchmark, then “Benchmark” means the applicable Benchmark Replacement.

“Benchmark Replacement” means the first alternative set forth in the order below that can be determined by the Issuer or its designee as of the Benchmark Replacement Date:

(1) the sum of (a) the alternate rate of interest that has been selected or recommended by the Relevant Governmental Body as the replacement for the then-current Benchmark and (b) the Benchmark Replacement Adjustment;

(2) the sum of (a) the ISDA Fallback Rate and (b) the Benchmark Replacement Adjustment; or

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(3) the sum of (a) the alternate rate of interest that has been selected by the Issuer or its designee as the replacement for the then-current Benchmark giving due consideration to any industry-accepted rate of interest as a replacement for the then-current Benchmark for U.S. dollar-denominated floating rate notes at such time and (b) the Benchmark Replacement Adjustment.

“Benchmark Replacement Adjustment” means the first alternative set forth in the order below that can be determined by the Issuer or its designee as of the Benchmark Replacement Date:

(1) the spread adjustment, or method for calculating or determining such spread adjustment (which may be a positive or negative value or zero), that has been selected or recommended by the Relevant Governmental Body for the applicable Unadjusted Benchmark Replacement;

(2) if the applicable Unadjusted Benchmark Replacement is equivalent to the ISDA Fallback Rate, the ISDA Fallback Adjustment; or

(3) the spread adjustment (which may be a positive or negative value or zero) that has been selected by the Issuer or its designee giving due consideration to any industry-accepted spread adjustment, or method for calculating or determining such spread adjustment, for the replacement of the then-current Benchmark with the applicable Unadjusted Benchmark Replacement for U.S. dollar-denominated floating rate notes at such time.

“Benchmark Replacement Conforming Changes” means, with respect to any Benchmark Replacement, any technical, administrative or operational changes (including changes to the definition of the Interest Period, timing and frequency of determining rates and making payments of interest, rounding of amounts or tenors and other administrative matters) that the Issuer or its designee decides may be appropriate to reflect the adoption of such Benchmark Replacement in a manner substantially consistent with market practice (or, if the Issuer or its designee decides that adoption of any portion of such market practice is not administratively feasible or if the Issuer or its designee determines that no market practice for use of the Benchmark Replacement exists, in such other manner as the Issuer or its designee determines is reasonably necessary).

“Benchmark Replacement Date” means the earliest to occur of the following events with respect to the then-current Benchmark (including the daily published component used in the calculation thereof):

(1) in the case of clause (1) or (2) of the definition of “Benchmark Transition Event,” the later of (a) the date of the public statement or publication of information referenced therein and (b) the date on which the administrator of the Benchmark permanently or indefinitely ceases to provide the Benchmark (or such component); or

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(2) in the case of clause (3) of the definition of “Benchmark Transition Event,” the date of the public statement or publication of information referenced therein.

“Benchmark Transition Event” means the occurrence of one or more of the following events with respect to the then-current Benchmark (including the daily published component used in the calculation thereof):

(1) a public statement or publication of information by or on behalf of the administrator of the Benchmark (or such component) announcing that such administrator has ceased or will cease to provide the Benchmark (or such component), permanently or indefinitely; provided that, at the time of such statement or publication, there is no successor administrator that will continue to provide the Benchmark (or such component);

(2) a public statement or publication of information by the regulatory supervisor for the administrator of the Benchmark (or such component), the central bank for the currency of the Benchmark (or such component), an insolvency official with jurisdiction over the administrator for the Benchmark (or such component), a resolution authority with jurisdiction over the administrator for the Benchmark (or such component) or a court or an entity with similar insolvency or resolution authority over the administrator for the Benchmark, which states that the administrator of the Benchmark (or such component) has ceased or will cease to provide the Benchmark (or such component) permanently or indefinitely; provided that, at the time of such statement or publication, there is no successor administrator that will continue to provide the Benchmark (or such component); or

(3) a public statement or publication of information by the regulatory supervisor for the administrator of the Benchmark announcing that the Benchmark is no longer representative.

“ISDA Definitions” means the 2006 ISDA Definitions published by the International Swaps and Derivatives Association, Inc. or any successor thereto, as amended or supplemented from time to time, or any successor definitional booklet for interest rate derivatives published from time to time.

“ISDA Fallback Adjustment” means the spread adjustment (which may be a positive or negative value or zero) that would apply for derivatives transactions referencing the ISDA Definitions to be determined upon the occurrence of an index cessation event with respect to the Benchmark for the applicable tenor.

“ISDA Fallback Rate” means the rate that would apply for derivatives transactions referencing the ISDA Definitions to be effective upon the occurrence of an index cessation date with respect to the Benchmark for the applicable tenor excluding the applicable ISDA Fallback Adjustment.

“Reference Time” with respect to any determination of the Benchmark means (1) if the Benchmark is Compounded SOFR, the SOFR Determination Time, and (2) if the Benchmark is not Compounded SOFR, the time determined by the Issuer or its designee after giving effect to the Benchmark Replacement Conforming Changes.

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“Relevant Governmental Body” means the Federal Reserve Board and/or the Federal Reserve Bank of New York, or a committee officially endorsed or convened by the Federal Reserve Board and/or the Federal Reserve Bank of New York or any successor thereto.

“Unadjusted Benchmark Replacement” means the Benchmark Replacement excluding the Benchmark Replacement Adjustment.

Neither the Trustee nor the Calculation Agent shall be under any obligation (1) to monitor, determine or verify the unavailability or cessation of Compounded SOFR (or any other Benchmark), or whether or when there has occurred, or to give notice to any other transaction party of the occurrence of, any Benchmark Transition Event or related Benchmark Replacement Date, (2) to select, determine or designate any Benchmark Replacement, or other successor or replacement benchmark index, or whether any conditions to the designation of such a rate or index have been satisfied, (3) to select, determine or designate any Benchmark Replacement Adjustment, or other modifier to any replacement or successor index, or (4) to determine whether or what Benchmark Replacement Conforming Changes are necessary or advisable, if any, in connection with any of the foregoing, including, but not limited to, adjustments as to any alternative spread thereon, the business day convention, interest determination dates or any other relevant methodology applicable to such substitute or successor benchmark. In connection with the foregoing, each of the Trustee and the Calculation Agent shall be entitled to conclusively rely on any determinations made by the Issuer or its designee without independent investigation, and neither will have any liability for actions taken at the Issuer’s direction in connection therewith.

Neither the Trustee nor the Calculation Agent shall be liable for any inability, failure or delay on its part to perform any of its duties set forth in the Nineteenth Supplemental Indenture as a result of the unavailability of Compounded SOFR or other applicable Benchmark Replacement, including as a result of any failure, inability, delay, error or inaccuracy on the part of any other transaction party in providing any direction, instruction, notice or information required or contemplated by the terms of the Nineteenth Supplemental Indenture and reasonably required for the performance of such duties. Neither the Trustee nor the Calculation Agent shall be responsible or liable for the Issuer’s actions or omissions or for those of its designee, or for any failure or delay in the performance by such designee, nor shall either the Trustee or the Calculation Agent be under any obligation to oversee or monitor the Issuer’s performance or that of such designee.

The indebtedness evidenced by this Note is, to the extent provided in the Indenture, senior and unsecured and will rank in right of payment on parity with all other senior unsecured obligations of the Issuer.

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This Note shall not be entitled to any benefit under the Indenture hereinafter referred to or be valid until the Certificate of Authentication hereon shall have been signed manually by or on behalf of the Trustee.

The provisions of this Note are continued on the reverse side hereof and such continued provisions shall for all purposes have the same effect as though fully set forth at this place.

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IN WITNESS WHEREOF, the Issuer has caused this instrument to be executed.

Dated:

Attest:

[Signature Page to Global Note]

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CERTIFICATE OF AUTHENTICATION

This is one of the Notes of the series of Notes described in the within-mentioned Indenture.

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ASSIGNMENT FORM

FOR VALUE RECEIVED, the undersigned hereby

sells, assigns and transfers to

(Insert Social Security number or other identifying number of assignee)

(Please print or typewrite name and address, including zip code of assignee)

the within Note of Marsh & McLennan Companies, Inc. and hereby does irrevocably constitute and appoint

Attorney to transfer said Note on the books of the within-named Issuer with full power of substitution in the premises.

Signature(s) must be guaranteed by an eligible Guarantor Institution (banks, stock brokers, savings and loan associations and credit unions) with membership in an approved signature guarantee medallion program pursuant to Securities and Exchange Commission Rule 17Ad-15.

NOTICE: The signature to this assignment must correspond with the name as it appears on the first page of the within Note in every particular, without alteration or enlargement or any change whatever.

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SCHEDULE OF INCREASES OR DECREASES IN GLOBAL SECURITY

MARSH & McLENNAN COMPANIES, INC.

Floating Rate Senior Notes due 2027

The initial aggregate principal amount of this Global Security is $[     ]. The following increases or decreases in this Global Security have been made:

No:    

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MARSH & McLENNAN COMPANIES, INC.

Floating Rate Senior Notes due 2027

This Note is one of a duly authorized series of Securities (referred to in the Base Indenture (hereafter defined)), of the Issuer (herein sometimes referred to as the “Notes”), all such Securities issued or to be issued in one or more series under and pursuant to an indenture (the “Base Indenture”), dated as of July 15, 2011, between the Issuer and The Bank of New York Mellon, as Trustee (the “Trustee”), as supplemented in the case of the Notes by the Nineteenth Supplemental Indenture, dated as of November 8, 2024, between the Issuer and the Trustee (the Base Indenture, as so supplemented, the “Indenture”), to which Indenture and all indentures supplemental thereto reference is hereby made for a description of the rights, limitations of rights, obligations, duties and immunities thereunder of the Trustee, the Issuer and the holders of the Notes. This series of Notes is initially limited in aggregate principal amount as specified in said Nineteenth Supplemental Indenture. This series of Notes and any Additional Notes of this series shall constitute one series for all purposes under the Indenture, including without limitation, amendments, waivers and redemptions. The terms and conditions of this series of Notes and any Additional Notes of this series (other than the issue price, the date of issuance, the payment of interest accruing prior to the issue date of the Additional Notes and the first payment of interest following such issue date) shall be the same and shall bear the same CUSIP number.

The Notes are not subject to optional redemption prior to maturity (other than as a result of a special mandatory redemption pursuant to the terms of this Note).

If (A) the Issuer’s pending acquisition of TIH Blocker II, Inc., the parent company of McGriff Insurance Services, LLC (the “Transaction”) is not completed by the parties to that certain Agreement and Plan of Merger, dated as of September 29, 2024, by and among Marsh & McLennan Agency LLC, an indirect wholly-owned subsidiary of the Issuer, BD Merger Sub, Inc., TIH Blocker II, Inc. and TIH Platform Midco, L.P. (the “Merger Agreement”), on or prior to the later of (x) September 29, 2025 or (y) the date that is five Business Days after any later date to which the parties to the Merger Agreement may agree to extend the “Outside Date” in the Merger Agreement, (B) the Merger Agreement is terminated or (C) the Issuer notifies the Trustee, in writing, that it will not pursue the consummation of the Transaction (each, a “Special Mandatory Redemption Event”), then the Issuer shall redeem all of the Notes on the Special Mandatory Redemption Date at a special mandatory redemption price equal to 101% of the aggregate principal amount of the Notes to be redeemed, plus accrued and unpaid interest from and including the date of initial issuance, or the most recent date to which interest has been paid, whichever is later, to but not including the Special Mandatory Redemption Date (the “Special Mandatory Redemption Price”).

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Upon the occurrence of a Special Mandatory Redemption Event, promptly, but in no event more than five Business Days, following such Special Mandatory Redemption Event, the Issuer shall deliver written notice to the Trustee of such special mandatory redemption and the date upon which such Special Mandatory Redemption Notes will be redeemed, which shall be no earlier than the fifth Business Day following the date of such notice (the “Special Mandatory Redemption Date”), and a notice to registered holders of the Notes that such Notes shall be redeemed and specifying the Special Mandatory Redemption Date and such other information as required, to the extent applicable, by the Base Indenture (the “Special Mandatory Redemption Notice”), which shall be delivered in the name and at the expense of the Issuer. The Trustee shall promptly mail or electronically deliver the Special Mandatory Redemption Notice, according to the procedures of The Depository Trust Company, to each registered holder of Notes to be redeemed at such holder’s registered address.

If funds sufficient to pay the Special Mandatory Redemption Price of all of the Notes to be redeemed on the Special Mandatory Redemption Date are deposited with a Paying Agent or the Trustee on or before such Special Mandatory Redemption Date, then on and after such Special Mandatory Redemption Date, the Notes shall cease to bear interest and, other than the right to receive the Special Mandatory Redemption Price, all rights under the Notes shall terminate.

The Indenture contains provisions permitting the Issuer and the Trustee, with the consent of the holders of not less than a majority in aggregate principal amount of the Notes of all of the series at the time Outstanding affected thereby (all such series voting together as a single class), as defined in the Indenture, to execute supplemental indentures for the purpose of adding any provisions to or changing in any manner or eliminating any of the provisions of the Base Indenture or of any supplemental indenture or of modifying in any manner the rights of the holders of the Notes; provided, however, that no such supplemental indenture shall, without the consent of the holders of each Security then Outstanding and affected thereby (i) extend the fixed maturity of any Securities, including the Notes, or reduce the principal amount thereof, or reduce the rate or extend the time of payment of interest thereon, or reduce any premium payable upon the redemption thereof, or (ii) reduce the aforesaid percentage of Securities, the holders of which are required to consent to any such supplemental indenture. The Indenture also contains provisions permitting the holders of a majority in aggregate principal amount of the Notes of all series at the time Outstanding affected thereby (all such series voting together as a single class), to waive any past default in the performance of any of the covenants contained in the Base Indenture, or established pursuant to the Base Indenture with respect to such series, and its consequences, except a default in the payment of the principal of or premium, if any, or interest on any Securities, including the Notes, in which case, each such affected series voting as a separate class. Any such consent or waiver by the registered holder of this Note (unless revoked as provided in the Base Indenture) shall be conclusive and binding upon such holder and upon all future holders and owners of this Note and of any Note issued in exchange herefor or in place hereof (whether by registration of transfer or otherwise), irrespective of whether or not any notation of such consent or waiver is made upon this Note.

No reference herein to the Indenture and no provision of this Note or of the Indenture shall alter or impair the obligation of the Issuer, which is absolute and unconditional, to pay the principal of and premium, if any, and interest on this Note at the time and place and at the rate and in the money herein prescribed.

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The Issuer is subject to certain covenants contained in the Indenture with respect to, and for the benefit of the holders of, the Notes. The Trustee shall not be obligated to monitor or confirm, on a continuing basis or otherwise, the Issuer’s compliance with the covenants contained in the Indenture or with respect to reports or other certificates filed under the Indenture; provided, however, that nothing herein shall relieve the Trustee of any obligations to monitor the Issuer’s timely delivery of all reports and certificates required under Section 5.03 of the Base Indenture and to fulfill its obligations under Article VII of the Indenture. If an Event of Default as defined in the Indenture with respect to the Notes shall occur and be continuing, the principal of the Notes may be declared due and payable in the manner and with the effect provided in the Indenture.

As provided in and subject to the provisions of the Indenture, the holder of this Note shall not have the right to institute any proceeding with respect to the Indenture or for the appointment of a receiver or Trustee or for any other remedy thereunder, unless such holder shall have previously given the Trustee written notice of a continuing Event of Default with respect to the Notes, the holders of not less than 25% in principal amount of the Outstanding Notes (in the case of an Event of Default described in clauses (a)(i) or (a)(ii) of Section 6.01 of the Base Indenture, each such series voting as a separate class, and in the case of an Event of Default described in clauses (a)(iii), (a)(iv), (a)(v) or (a)(vi) of Section 6.01 of the Base Indenture, all affected series voting together as a single class) shall have made written request to the Trustee to institute proceedings in respect of such Event of Default as Trustee and offered the Trustee reasonable indemnity and the Trustee shall have failed to institute any such proceeding for 60 days after receipt of such notice, request and offer of indemnity and the Trustee shall not have received from the holders of a majority in principal amount of the Notes at the time Outstanding (voting as provided in Section 6.04(b) of the Base Indenture) a direction inconsistent with such request. The foregoing shall not apply to any suit instituted by the holder of this Note for the enforcement of any payment of principal hereof or any interest on or after the respective due dates expressed herein.

As provided in the Indenture and subject to certain limitations therein set forth, this Note is transferable by the registered holder hereof on the Security Register of the Issuer, upon surrender of this Note for registration of transfer at the office or agency of the Issuer in the Borough of Manhattan, the City and State of New York accompanied by a written instrument or instruments of transfer in form satisfactory to the Issuer or the Trustee duly executed by the registered holder hereof or his attorney duly authorized in writing, and thereupon one or more new Notes of authorized denominations and for the same aggregate principal amount and series will be issued to the designated transferee or transferees. No service charge will be made for any such transfer, but the Issuer may require payment of a sum sufficient to cover any tax or other governmental charge payable in relation thereto.

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Prior to due presentment for registration of transfer of this Note, the Issuer, the Trustee, any paying agent and any Security Registrar may deem and treat the registered holder hereof as the absolute owner hereof (whether or not this Note shall be overdue and notwithstanding any notice of ownership or writing hereon made by anyone other than the Security Registrar) for the purpose of receiving payment of or on account of the principal hereof and premium, if any, and interest due hereon and for all other purposes, and neither the Issuer nor the Trustee nor any paying agent nor any Note Registrar shall be affected by any notice to the contrary.

No recourse shall be had for the payment of the principal of or the interest on this Note, or for any claim based hereon, or otherwise in respect hereof, or based on or in respect of the Indenture, against any incorporator, stockholder, officer or director, past, present or future, as such, of the Issuer or of any predecessor or successor corporation, whether by virtue of any constitution, statute or rule of law, or by the enforcement of any assessment or penalty or otherwise, all such liability being, by the acceptance hereof and as part of the consideration for the issuance hereof, expressly waived and released.

The Notes are issuable only in registered form without coupons in authorized denominations. As provided in the Indenture and subject to certain limitations herein and therein set forth, Notes so issued are exchangeable for a like aggregate principal amount of Notes of a different authorized denomination, as requested by the holder surrendering the same.

All terms used in this Note which are defined in the Indenture shall have the meanings assigned to them in the Indenture.

THE INDENTURE AND THE NOTES INCLUDING THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK.

Pursuant to a recommendation promulgated by the Committee on Uniform Security Identification Procedures, the Issuer has caused “CUSIP” numbers to be printed on the Notes as a convenience to the holders of the Notes. No representation is made as to the correctness or accuracy of such CUSIP numbers as printed on the Notes, and reliance may be placed only on the other identification numbers printed hereon.

Unless the certificate of authentication hereon has been executed by or on behalf of the Trustee by manual signature, which may be delivered via electronic transmission, this Note shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purposes.

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