Form of 3.00% Senior Note due 2032

Exhibit 4.3

(Face of Security)

This Security is a Global Security within the meaning of the Indenture hereinafter referred to and is registered in the name of The Depositary Trust Company, a New York corporation (“DTC”) or a nominee of DTC. This Security is exchangeable for Securities registered in the name of a person other than DTC or its nominee only in limited circumstances described in the Indenture, and may not be transferred except as a whole by DTC to a nominee of DTC, by a nominee of DTC to DTC or another nominee of DTC or by DTC or any such nominee to a successor depository or a nominee of such a successor depository.

CUSIP No. 743315 AZ6

THE PROGRESSIVE CORPORATION

3.00% SENIOR NOTE DUE 2032

THE PROGRESSIVE CORPORATION, an Ohio corporation (the “Issuer”), for value received, hereby promises to pay to CEDE & Co., c/o The Depository Trust Company, 55 Water Street, New York, New York 10041 or registered assigns, at the office or agency of the Issuer at the office of the Trustee in Boston, Massachusetts, the principal sum of [                     ] ($[             ]) on March 15, 2032 (the “Maturity Date”), in such coin or currency of the United States of America as at the time of payment shall be legal tender for the payment of public and private debts, and to pay interest semiannually on March 15 and September 15 of each year (each, an “Interest Payment Date”), commencing on September 15, 2022, on said principal sum at said office or agency, in like coin or currency, at the rate per annum specified in the title of this Note, from the March 15 or the September 15, as the case may be, next preceding the date of this Note to which interest has been paid, unless no interest has been paid on this Note, in which case from March 9, 2022, until payment of said principal sum has been made or duly provided for at the office or agency maintained by the Issuer for such purpose; provided, that payment of interest may be made at the option of the Issuer by check mailed to the address of the person entitled thereto as such address shall appear on the Security Register. The interest so payable on any Interest Payment Date will, subject to certain exceptions provided in the Indenture referred to on the reverse hereof, be paid to the person in whose name this Note is registered at the close of business on the March 1 or September 1, as the case may be, next preceding the related Interest Payment Date except that any interest payable upon maturity or earlier redemption of this Note will be payable to the person to whom the principal of this Note is payable.

Reference is made to the further provisions of this Note set forth on the reverse hereof. Such further provisions shall for all purposes have the same effect as though fully set forth at this place.

This Note shall not be valid or become obligatory for any purpose until the certificate of authentication hereon shall have been manually signed by the Trustee under the Indenture referred to on the reverse hereof.

IN WITNESS WHEREOF, The Progressive Corporation has caused this instrument to be signed by its duly authorized officers.

Dated:

TRUSTEE’S CERTIFICATE OF AUTHENTICATION

This is one of the Securities, of the series designated herein, referred to in the within-mentioned Indenture.

(Back of Security)

THE PROGRESSIVE CORPORATION

3.00% SENIOR NOTE DUE 2032

This Note is one of a duly authorized issue of debentures, notes, bonds or other evidences of indebtedness of the Issuer (hereinafter called the “Securities”) of the series hereinafter specified, all issued or to be issued under and pursuant to an indenture dated as of September 12, 2018, as supplemented by the Third Supplemental Indenture thereto, dated as of March 9, 2022 (herein called the “Indenture”), between the Issuer and U.S. Bank Trust Company, National Association, as successor in interest to U.S. Bank National Association, as Trustee (herein called the “Trustee”), 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 Securities. The Securities may be issued in one or more series, which different series may be issued in various aggregate principal amounts, may mature at different times, may bear interest (if any) at different rates, may be subject to different redemption provisions (if any), may be subject to different sinking, purchase or analogous funds (if any) and may otherwise vary as in the Indenture provided. This Security is one of a series designated as the “3.00% Senior Notes due 2032” of the Issuer (herein called the “Notes”) initially limited in aggregate principal amount to $500,000,000. The Issuer may, without the consent of Holders, increase the principal amount of the Notes in the future by issuing additional Notes on the same terms and conditions and with the same CUSIP Number(s) as the Notes.

If any Interest Payment Date or the Maturity Date or any earlier Redemption Date (as defined below) falls on any date that is not a Business Day, then the related payment will be made on the next succeeding Business Day, without any interest or other additional payment in respect of the delay. “Business Day” means any day, other than a Saturday or Sunday, that is not a day on which banking institutions or trust companies are generally authorized or required by law, regulation or executive order to close in The City of New York.

In case an Event of Default, as defined in the Indenture, with respect to the Notes shall have occurred and be continuing, the principal hereof may be declared, and upon such declaration shall become, due and payable, in the manner, with the effect and subject to the conditions provided in the Indenture.

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 Securities at the time Outstanding of all series to be affected (voting as one class), evidenced as in the Indenture provided, to execute supplemental indentures adding any provisions to or changing in any manner or eliminating any of the provisions of the Indenture or of any supplemental indenture or modifying in any manner the rights of the Holders of the Securities of each such series; provided, however, that no such supplemental indenture shall, among other things, (i) extend the final maturity of any Security, or reduce the principal amount thereof or any amount payable upon redemption thereof, or change the currency of payment thereof, or reduce the rate or extend the time of payment of any interest thereon, or impair or affect the rights of any Holder to institute suit for the payment thereof, without the consent of the Holder of each Security so affected or (ii) reduce the aforesaid percentage of Securities, the Holders of which are required to consent to any such supplemental indenture, without the consent of the Holder of each Security so affected. It is also provided in the Indenture that, with respect to certain defaults or Events of Default regarding the Securities of any series, prior to any declaration accelerating the maturity of such Securities, the Holders of a majority in aggregate principal amount Outstanding of the Securities of such series may on behalf of the Holders of all the Securities of such series waive any such past default or Event of Default and its consequences. The preceding sentence shall not, however, apply to a default in the payment of the principal of or premium, if any, or interest on any of the Securities. Any such consent or waiver by the Holder of this Note (unless revoked as provided in the Indenture) shall be conclusive and binding upon such Holder and upon all future Holders and owners of this Note and any Note which may be issued in exchange or substitution herefor, irrespective of whether or not any notation thereof is made upon this Note or such other 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 interest on this Note in the manner, at the respective times, at the rate and in the coin or currency herein prescribed.

The Notes are issuable in registered form without coupons in minimum denominations of $2,000 and any integral multiple of $1,000 at the office or agency of the Issuer at the office of the Trustee in Boston, Massachusetts, and in the manner and subject to the limitations provided in the Indenture, but without the payment of any service charge. Notes may be exchanged for a like aggregate principal amount of Notes of other authorized denominations.

Notice of any redemption of Notes will be mailed or electronically delivered (or otherwise transmitted in accordance with the depository’s procedures) at least 10 days, but not more than 60 days, before the redemption date to each Holder of Notes to be redeemed (a “Redemption Date”). Prior to 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 value 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 20 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.

“Par Call Date” means December 15, 2031.

“Treasury Rate” means, with respect to any Redemption Date, the yield determined by the Issuer in accordance with the following:

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). 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 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. The Trustee shall not be responsible for calculating or confirming the redemption price.

In the case of a partial redemption, selection of the Notes for redemption will be made pro rata, by lot or by such other method as the Trustee in its sole discretion deems appropriate and fair. 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 Depository Trust Company (or another 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.

Upon due presentment for registration of transfer of this Note at the office or agency of the Issuer at the office of the Trustee in Boston, Massachusetts, a new Note or Notes of authorized denominations for an equal aggregate principal amount will be issued to the transferee in exchange therefor, subject to the limitations provided in the Indenture, without charge except for any tax or other governmental charge imposed in connection therewith.

The Issuer, the Trustee and any authorized agent of the Issuer or the Trustee may deem and treat the registered Holder hereof as the absolute owner of this Note (whether or not this Note shall be overdue and notwithstanding any notation of ownership or other writing hereon), for the purpose of receiving payment of, or on account of, the principal hereof and, subject to the provisions on the face hereof, interest hereon, and for all other purposes, and neither the Issuer nor the Trustee nor any authorized agent of the Issuer or the Trustee shall be affected by notice to the contrary.

No recourse under or upon any obligation, covenant or agreement of the Issuer in the Indenture or any indenture supplemental thereto or in any Note, or because of the creation of any indebtedness represented thereby, shall be had against any incorporator, shareholder, officer or director, as such, of the Issuer or of any successor corporation, either directly or through the Issuer or any successor corporation, under any rule of law, statute or constitutional provision or by the enforcement of any assessment or by any legal or equitable proceeding or otherwise, all such liability being expressly waived and released by the acceptance hereof and as part of the consideration for the issue hereof.

Terms used herein which are defined in the Indenture shall have the respective meanings assigned thereto in the Indenture.

FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s) and transfer(s) unto

(PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS INCLUDING POSTAL ZIP CODE OF ASSIGNEE)

the within Note and all rights thereunder, hereby irrevocably constituting and appointing

attorney to transfer said Note on the books of the Issuer, with full power of substitution in the premises.