Form of 2023 Performance Unit Award Agreement under the W. R. Berkley Corporation 2019 Long-Term Incentive Plan

This 2023 Performance Unit Award Agreement (this “Agreement”), effective January 1, 2023, represents an Award of Performance Units by W. R. Berkley Corporation (the “Company”), to the Participant named below, pursuant to the provisions of the W. R. Berkley Corporation 2019 Long-Term Incentive Plan (as may be amended from time to time, the “Plan”). The value of the Performance Units will be determined based on the increase in the Company’s Book Value Per Share during the Performance Period, as determined below.

Important jurisdiction-specific modifications to this Agreement are contained in Exhibit A hereto and are binding and incorporated herein. If there is any inconsistency between this Agreement and Exhibit A, Exhibit A shall govern.

The Plan, together with this Agreement and Exhibit A, provide a complete description of the terms and conditions governing the Award and the Performance Units, and constitute the entire agreement by and between the parties hereto with respect to the subject matter hereof, superseding all prior agreements, correspondence and understandings and all prior and contemporaneous oral agreements and understandings, among the parties with regard to that subject matter. If there is any inconsistency between the terms of this Agreement and/or of Exhibit A, on the one hand, and the terms of the Plan, on the other hand, the Plan’s terms shall completely supersede and replace the conflicting terms of this Agreement and of Exhibit A. All capitalized terms in this Agreement shall have the meanings ascribed to them in the Plan, unless specifically set forth otherwise herein.

The parties hereto agree as follows:

1. General Grant Information. The individual named below has been selected to be a Participant in the Plan and receive a grant of Performance Units, as specified below:

(a) Participant:

(b) Number of Performance Units Granted:

(c) Initial Value of Performance Units: $0.00

(d) Date of Grant: January 1, 2023

(e) Performance Measure: Increase in Book Value Per Share, as set forth in Section 3 below.

2. Performance Period. The Performance Period commences on January 1, 2023, and ends on December 31, 2027; provided, however, that, in the event that the Participant dies or experiences a Qualifying Termination, the Performance Period for such Participant shall be deemed to end on December 31 of the fiscal year immediately prior to the fiscal year in which such death or Qualifying Termination occurred.

3. Value of a Performance Unit. Each Performance Unit shall have a value determined by multiplying the Increase in Book Value Per Share by four and one hundred twenty-eight thousandths (4.128), subject to a maximum value of one hundred dollars ($100.00) per Performance Unit.

4. Eligibility for Payment of Performance Units. The Participant shall only be eligible for payment of the value of Performance Units granted under this Agreement if (a) the Participant’s employment with the Company, or the applicable Subsidiary or Affiliate, continues through the end of the Performance Period; (b) the Participant has complied with the Obligations

as set forth in Section 5(d) at all times up to and including the Settlement Date; and (c) the Participant has not committed Misconduct at any time up to and including the Settlement Date.

5. Payout on Performance Units. (a) Except as set forth in Sections 5(b) or 8 below, the aggregate positive value, if any, of the Performance Units, based on the value of the Performance Units on the last day of the Performance Period as determined in accordance with this Agreement and subject to the maximum value set forth in Section 3 hereof, shall be paid to the Participant in cash following the last day of the Performance Period but in no event later than March 31, 2028 (also referred to as the Settlement Date).

(b) In the event of the death or Qualifying Termination of the Participant, payment of the value, if any, of the Performance Units in accordance with the terms of this Agreement shall extinguish the Company’s obligation hereunder, and the Participant shall not be entitled to any further payment or appreciation in the value of the Performance Units. In the event such payment is made due to the Participant’s death, such payment shall be made either (1) to the Participant’s designated beneficiary(ies) in the Company’s “Workday” human resources system (or any successor designation system approved by the Company), or (2) to the Participant’s estate if no beneficiary(ies) has been so designated by the Participant. Any payment upon death or any Qualifying Termination shall be made within ninety (90) calendar days following such death or Qualifying Termination; provided, however, that if such ninety (90) day period spans two separate taxable years, such payment shall be made in the later taxable year; provided further, however, that any payment hereunder (calculated as of the end of the fiscal year immediately prior to the fiscal year in which such Qualifying Termination occurred) upon a Qualifying Termination shall be delayed until the earlier of (x) March 31, 2028 and (y) such time as the Participant has also undergone a “separation from service” as defined in Treas. Reg. 1.409A-1(h), at which time such payment shall be made to the Participant according to the schedule set forth in this Section 5(b) as if the Participant had undergone such Qualifying Termination (under the same circumstances), solely for the purpose of the date of payment, on the date of such “separation from service.” Notwithstanding anything herein to the contrary, to the extent the Participant is a “specified employee” as defined in Treas. Reg. 1.409A-1(i), any payment to be made upon the Participant’s “separation from service” shall be delayed until and made upon the earlier of (i) the six (6) month anniversary of the Participant’s “separation from service” and (ii) the Participant’s death.

(c) Once a payment is made pursuant to Section 5(a) or (b) above or Section 8 below, the Company shall have no further obligation to make any payment hereunder.

(d) If at any time up to or including the last day of the Relevant Period, the Participant breaches one or more of Participant’s Obligations, or agrees to enter into, or has entered into, an agreement (written, oral or otherwise) to breach one or more of Participant’s Obligations, or engages in Misconduct, then (a) the Participant shall immediately forfeit all of the Performance Units that have been awarded to the Participant under this Agreement but have not been paid to him/her, and the Participant shall have no further rights with respect to such Performance Units; and (b) the Participant shall repay to the Company, upon its demand, an amount equal to the total amount that has already been paid to the Participant in respect of Performance Units awarded under this Agreement. The determination whether the Participant has breached one or more of Participant’s Obligations or has engaged in Misconduct shall be made by the Committee in its sole and absolute discretion. The Committee has sole and absolute discretion to determine whether, notwithstanding its determination that the Participant has breached one or more of Participant’s Obligations or has engaged in Misconduct, recapture or forfeiture as provided herein shall not occur. The Committee’s exercise or nonexercise of such discretion with respect

to any particular event or occurrence by or with respect to the Participant or any other recipient of Performance Units under the Plan shall not in any way reduce or eliminate the authority of the Committee to (i) determine that any event or occurrence by or with respect to the Participant constitutes breaching one or more of Participant’s Obligations or engaging in Misconduct, or (ii) determine the related date of breach of the Participant’s Obligations or of Misconduct. The Participant acknowledges that the terms set forth herein with respect to breaching one or more of Participant’s Obligations, in view of the nature of the business in which the Company is engaged, is reasonable in scope (as to both the temporal and geographical limits) and necessary in order to protect the legitimate business interests of the Company. The Participant acknowledges further that breaching one or more of Participant’s Obligations or engaging in Misconduct would result in irreparable injuries to the Company and would cause loss in an amount that cannot be readily quantified. The Participant further acknowledges that repayment to the Company pursuant to this provision does not, and is not intended to, constitute actual or liquidated damages.

(e) The Participant’s employment per Section 4(a) will not be considered to continue if his or her employment has been terminated (regardless of the reason for such termination, regardless whether the termination was at Participant’s or Participant’s employer’s prompting, and regardless whether the termination is found to be invalid or in breach of applicable employment law or of the terms of the Participant’s employment agreement, if any), and unless otherwise expressly provided in this Agreement or determined by the Committee, the Participant’s eligibility for payment of the Performance Units awarded hereunder, if any, will terminate as of such date and will not be extended by any notice period arising under law or contract. Further, the Participant’s period of employment would not include any contractual notice period (except for such period of time, as determined in the Committee’s sole and absolute discretion, that the Participant is actively providing substantial services as required by the Participant’s employer during any notice period) or any period of “garden leave” or similar period arising under applicable employment laws or the terms of Participant’s employment agreement, if any.

6. Nontransferability. The Performance Units granted hereunder may not be sold, transferred, pledged, assigned, or otherwise alienated or hypothecated, except as otherwise expressly provided for in this Agreement and/or the Plan.

7. Administration. This Agreement and the rights of the Participant hereunder are subject to all the terms and conditions of the Plan, as the same may be amended from time to time, as well as to such rules and regulations as the Committee may adopt for administration of the Plan. It is expressly understood that the Committee is authorized to administer, construe, and make all determinations necessary or appropriate to the administration of the Plan and this Agreement, all of which shall be final and binding upon the Participant, including without limitation any determination concerning a breach of an Obligation or an instance of Misconduct.

8. Change in Control. In the event of a Change in Control, unless otherwise specifically prohibited under applicable law or by the rules and regulations of any governmental agencies or national securities exchanges:

(a) With respect to each outstanding Performance Unit that is assumed or substituted in connection with a Change in Control, in the event that the Participant’s employment with the Company or, as applicable, its Subsidiary or Affiliate, is terminated (i) by the Company or such Subsidiary or Affiliate without Cause or (ii) by the Participant for Good Reason, in each case during the eighteen (18) month period following such Change in Control, the value of all Performance Units shall be determined and fixed as of the end of the fiscal year immediately preceding the fiscal year in which such termination occurs, and such value shall be paid to the

Participant in accordance with, and subject to, the provisions of Sections 4 and 5 hereof. Following such termination, Performance Units shall not accrue any additional value for the fiscal year in which such termination occurs or for any subsequent fiscal years.

(b) With respect to each outstanding Performance Unit that is not assumed or substituted in connection with a Change in Control, immediately upon the occurrence of the Change in Control, which shall be deemed the end of the Performance Period, the value of all Performance Units shall be determined and fixed as of the end of the fiscal year immediately preceding the fiscal year in which such Change in Control occurs, and such value shall be paid to the Participant within ninety (90) calendar days following the date of such Change in Control; provided, however, that if such ninety (90) day period spans two separate taxable years, such payment shall be made in the later taxable year. Following such Change in Control, Performance Units shall not accrue any additional value for the fiscal year in which such Change in Control occurs or for any subsequent fiscal years.

(c) For purposes of this Section 8, a Performance Unit shall be considered assumed or substituted for if, following the Change in Control, the Performance Unit is assumed or substituted for with one of comparable value and remains subject to the same terms and conditions that were applicable to the Performance Units immediately prior to the Change in Control.

(d) For purposes of this Section 8, an event shall only constitute a Change in Control if the event constituting a Change in Control also constitutes “a change in the ownership or effective control of the Company, or in the ownership of a substantial portion of the assets of the Company” within the meaning of Section 409A(a)(2)(A)(v) of the Code and the regulations promulgated thereunder.

(a) This Agreement shall not confer upon the Participant any right to continuation of employment by the Company or any of its Subsidiaries or Affiliates, nor shall this Agreement interfere in any way with the Company’s or any Subsidiary’s or Affiliate’s right to terminate the Participant’s employment at any time.

(b) The Committee may terminate, amend, or modify the Plan; provided, however, that no such termination, amendment, or modification of the Plan may in any material way adversely affect the Participant’s rights under this Agreement.

(c) The Company or, as applicable, the Subsidiary or Affiliate whose employment of the Participant gives rise the Participant’s participation in the Plan, shall have the authority to deduct or withhold from any payment hereunder or from any other source of the Participant’s compensation, or may require the Participant to remit to the Company or such Subsidiary or Affiliate, before payment hereunder, an amount sufficient to satisfy federal, state, and local taxes (including Participant’s FICA obligation) required by law to be withheld with respect to any taxable event arising out of this Agreement.

(d) This Agreement shall be subject to all applicable laws, rules, and regulations, and to such approvals by any governmental agencies or national securities exchanges as may be required.

(e) To the extent not preempted by federal law, this Agreement shall be governed by, interpreted and construed in accordance with, the laws of the State of Delaware, regardless of its conflicts of laws principles. The jurisdiction and venue for any dispute arising under, or any action brought to enforce or otherwise relating to, this Agreement will be exclusively in the courts of the State of Delaware, including the federal courts located in Delaware in the event federal jurisdiction exists. Participant hereby irrevocably consents to the exclusive personal

jurisdiction and venue of the federal and state courts of the State of Delaware for the resolution of any disputes arising out of, or relating to, this Agreement and irrevocably waives any claim or argument that the courts of the State of Delaware are an inconvenient forum. In any action arising under or relating to this Agreement, the court shall not have the authority to, and shall not, conduct a de novo review of any determination made by the Committee or the Company but is instead authorized to determine solely whether the determination was the result of fraud or bad faith under Delaware law.

(f) All obligations of the Company under the Plan and this Agreement with respect to the Performance Units shall be binding on any successor to the Company, whether the existence of such successor is the result of a direct or indirect purchase, merger, consolidation, or otherwise, of all or substantially all of the business and/or assets of the Company.

(g) The invalidity or unenforceability of any provision or provisions of this Agreement shall not affect the validity or enforceability of any other provision or provisions of this Agreement, which shall remain in full force and effect. If any provision of this Agreement is held to be invalid, void or unenforceable in any jurisdiction, the court shall substitute a valid, enforceable provision that preserves, to the maximum lawful extent, the terms and intent of the invalid, void, or unenforceable provision, and shall modify the Agreement so that the scope of the provision is reduced only to the minimum extent necessary to cause the modified provision to be valid, legal and enforceable. Such substitution or modification shall not affect the remainder of the provisions or their enforceability, including in jurisdictions other than the one of the court making the substitution or modification, or as to other participants in the Plan or other agreements under the Plan.

(h) By accepting an Award or any other benefit under the Plan, the Participant and each person claiming under or through the Participant shall be conclusively deemed to have indicated their acceptance and ratification of, and consent to, any action taken under the Plan by the Company, the Board or the Committee.

(i) TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, THE PARTICIPANT, EVERY PERSON CLAIMING UNDER OR THROUGH THE PARTICIPANT, AND THE COMPANY HEREBY WAIVE AND RELEASE ANY CLAIM UNDER FEDERAL, STATE OR LOCAL LAW THEY HAVE OR MAY HAVE TO A JURY TRIAL WITH RESPECT TO ANY LITIGATION DIRECTLY OR INDIRECTLY ARISING OUT OF, UNDER, OR IN CONNECTION WITH THE PLAN OR THIS AGREEMENT OR ANY ACTIONS TAKEN OR DETERMINATIONS MADE UNDER THE PLAN OR THIS AGREEMENT.

(j) Definitions. The following terms shall have the meanings ascribed to them when used in this Agreement:

(i) “Beginning Book Value Per Share” means $30.21.

(ii) “Book Value Per Share” as of the end of any fiscal year shall be equal to the quotient of X divided by Z, where X is equal to the sum of A, B, C, D and E minus the sum of F, G and H, and Z is equal to the sum of W plus Y: [((A+B+C+D+E)-(F+G+H)) ÷ (W+Y)]. For purposes of this calculation,

(A) shall be equal to the Company’s total common stockholders’ equity as of the end of such fiscal year, as determined in accordance with generally accepted accounting principles and reported in the Company’s audited financial statements,

(B) shall be equal to the cumulative after-tax expense of the Company from January 1, 2023 through the end of such fiscal year arising from all the Awards made under the Plan,

(C) shall be equal to the cumulative cash dividends on the Company’s common stock declared from January 1, 2023 through the end of such fiscal year,

(D) shall be equal to the cumulative cost of the Company’s common stock repurchased by the Company from January 1, 2023 through the end of such fiscal year,

(E) shall represent imputed interest on the cost of the Company’s common stock repurchased by the Company and the amount of special dividends (any dividend other than the regular quarterly cash dividend) paid by the Company during the Performance Period. Such interest shall be imputed on such repurchases and special dividends from the first day of the quarter following such repurchases and special dividends to the end of the Performance Period. The imputed interest rate shall be equal to the average annual Increase in Book Value Per Share for the Performance Period, before consideration of this subsection E,

(F) shall be equal to the Company’s accumulated other comprehensive income as of the end of such fiscal year,

(G) shall be equal to the cumulative unrealized gains and losses, net of tax, on equity securities (other than securities of consolidated subsidiaries or securities accounted for on the equity method) reported in retained earnings at the end of such fiscal year as a result of Accounting Standards Update 2016-01,

(H) shall be equal to the cumulative allowance for credit losses, net of tax, on applicable assets reported in retained earnings at the end of such fiscal year as a result of Accounting Standards Update 2016-13,

(W) shall be equal to the number of shares of the Company’s common stock issued and outstanding, net of treasury shares, as of the end of such fiscal year, and

(Y) shall be the cumulative number of shares of the Company’s common stock repurchased by the Company from January 1, 2023 through the end of such fiscal year.

Book Value Per Share shall be calculated without taking into account any forward or reverse split of the Company’s common stock or any stock dividend declared on the Company’s common stock and there shall be no adjustment to the number of Performance Units awarded hereunder in either event. Notwithstanding anything herein to the contrary the formula to determine Book Value Per Share may be further modified to take into account any factor set forth in Section 7.2 of the Plan.

(iii) “Cause” means “Cause” as defined in any active employment agreement between the Participant and the Company or any Subsidiary or Affiliate, as applicable, or, in the absence of any such definition, means the occurrence of any one of the following events, in each case as determined in the Committee’s sole and absolute discretion: (A) fraud, personal dishonesty, embezzlement or acts of gross negligence or gross misconduct on the part of the Participant in the course of his or her employment or services, (B) the Participant’s engagement in conduct that is materially injurious to the Company, a Subsidiary or an Affiliate, (C) the Participant’s conviction by a court of competent jurisdiction of, or pleading “guilty” or “no contest” to, (x) a felony or (y) any other criminal charge (other than minor traffic violations) which could reasonably be expected to have a material adverse impact on the Company’s or a Subsidiary’s or an Affiliate’s reputation or business; (D) public or consistent drunkenness by the Participant or his or her illegal use of narcotics which is, or could reasonably be expected to become, materially injurious to the reputation or business of the Company, a Subsidiary or an Affiliate or which impairs, or could reasonably be expected to impair, the performance of the Participant’s duties to the Company, a Subsidiary or an Affiliate; (E) willful failure by the Participant to follow the lawful directions of a superior officer; or (F) the Participant’s continued and material failure to fulfill his or her employment obligations to the Company or any Subsidiary or Affiliate.

(iv) “Client” means any insured, agent, broker, producer or other intermediary to or through whom the Company or any Subsidiaries or Affiliates provides insurance or reinsurance or related services.

(v) “Confidential Information” means an item of information or a compilation of information, in any form (tangible or intangible), related to the business of the Company or of a Subsidiary or Affiliate that the Company or such Subsidiary or Affiliate has not made known to the general public or authorized disclosure to the general public, and that is not generally known to the public through proper means, including but not limited to:

I.the Company’s, and its Subsidiaries’ and Affiliates’, Clients’ or Prospective Clients’ names, addresses (including email addresses), telephone, facsimile or other contact numbers and contact names, the nature of such Clients’ or Prospective Clients’ business operations, such Clients’ or Prospective Clients’ requirements for services supplied by the Company or its Subsidiaries and Affiliates, and all confidential aspects of such Clients’ or Prospective Clients’ relationships with the Company and its Subsidiaries and Affiliates.

Participant acknowledges that in the course of performing services for the Company and/or its Subsidiaries and Affiliates, the Participant has had and will have access to Confidential Information.

(vi) “Covered Business Partner” means any person, concern or entity (including, without limitation, any Client) as to which Participant, or persons supervised by Participant, had business-related contact or received or learned Confidential Information during the most recent two years of Participant’s employment with the Company or its Subsidiaries or Affiliates or such shorter period of time as employed (the “Look Back Period”).

(vii) “Disability” means the inability of the Participant to continue to perform services for the Company or any Subsidiary or Affiliate, as applicable, on account of his or her total and permanent disability as determined by the Committee in its sole and absolute discretion.

(viii) “Ending Book Value Per Share” means the highest Book Value Per Share determined as of the end of each fiscal year in the Performance Period.

(ix) “Good Reason” means “Good Reason” as defined in any active employment agreement between the Participant and the Company or any Subsidiary or Affiliate, as applicable, or, in the absence of any such definition, means the occurrence of any one of the following

events (unless the Participant agrees in writing that such event shall not constitute Good Reason), in each case as determined in the Committee’s sole and absolute discretion: (A) a material reduction in the Participant’s duties or responsibilities from those in effect immediately prior to a Change in Control; (B) a material reduction in the Participant’s base salary below the levels in effect immediately prior to a Change in Control; or (C) relocation of the Participant’s primary place of employment to a location more than fifty (50) miles from its location, and further from the Participant’s primary residence, immediately prior to a Change in Control; provided, however, that with respect to any Good Reason termination, the Participant gives the Company, or the Subsidiary or Affiliate by which the Participant is employed, not less than thirty (30) days’ written notice (within sixty (60) days of the occurrence of the event constituting Good Reason) of the Participant’s intention to terminate the Participant’s employment for Good Reason, and states in detail in such notice the particular act or acts, or failure or failures to act, that constitute(s) the grounds on which the proposed termination for Good Reason is based, and such termination shall be effective at the expiration of such thirty (30) day notice period only if during such period the Company has not fully cured such act or acts or failure or failures to act that otherwise would constitute Good Reason. Further, any provision in this definition to the contrary notwithstanding, in order to constitute a termination for Good Reason, such termination must occur within six (6) months of the initial existence of the applicable condition.

(x) “Increase in Book Value Per Share” means the amount, if any, by which the Ending Book Value Per Share exceeds Beginning Book Value Per Share for the Performance Period.

(xi) “Misconduct” means the Participant’s engagement, during the Participant’s employment with the Company or any Subsidiary or any Affiliate, in an act which would, in the sole and absolute discretion of the Committee, constitute fraud that could be punishable as a crime, or embezzlement against either the Company, any Subsidiary or any Affiliate.

(xii) “Obligations” means to not, either directly or indirectly, whether as an employee, consultant, independent contractor, partner, joint venturer or otherwise: (A) engage in or direct any business activities, except those which are ministerial or clerical in nature, which are competitive with any business activities conducted by the Company or any Subsidiary or Affiliate during all of or part of the Relevant Period in or directed into any geographical area (x) where the Participant had responsibilities on behalf of the Company, Subsidiary or Affiliate, or about which the Participant received Confidential Information and (y) in which the Company, Subsidiary or Affiliate has engaged in business during all of or part of the Relevant Period; (B) on behalf of any person or entity engaged in business activities competitive with the business activities of the Company or any Subsidiary or Affiliate, solicit or induce, or in any manner attempt to solicit or induce, any person employed by, or as an agent or producer of, the Company, Subsidiary or Affiliate to terminate such person's employment or agency or producer relationship, as the case may be, with the Company, Subsidiary or Affiliate; (C) divert, or attempt to divert, any Covered Business Partner from doing business with the Company or any Subsidiary or Affiliate, or attempt to induce any Covered Business Partner to cease being a customer of the Company, Subsidiary or Affiliate; (D) solicit a Covered Business Partner to do business with a competitor or prospective competitor of the Company or any Subsidiary or Affiliate; or (E) disclose, make use of, or attempt to make use of, property or Confidential Information of the Company or any Subsidiary or Affiliate, other than in the course of the performance of services to, or at the direction of, the Company, Subsidiary or Affiliate.

(xiii) “Prospective Client” means any person, concern or entity (including, without limitation, any potential insured, agent, producer or other intermediary) with whom or which the Committee determines in its sole and absolute discretion that Participant knew or should have known that the Company or any of its Subsidiaries or Affiliates has been in negotiations during the Look Back Period to provide insurance or reinsurance or related services.

(xiv) “Qualifying Termination” means the termination of the Participant’s employment with the Company and all Subsidiaries and Affiliates prior to the end of the Performance Period as a result of: (i) Disability or Retirement; (ii) an action by the Company or a Subsidiary or Affiliate, as applicable, for any reason other than Cause; or, (iii) following a Change in Control, an action by the Participant for Good Reason.

(xv) “Relevant Period” means the period beginning on the date hereof through the second anniversary of the Settlement Date.

(xvi) “Retirement” means the Participant’s retirement from service with the Company and all Subsidiaries and Affiliates with either the written consent of the Executive Chairman of the Board of the Company or the written consent of the Committee.

(xvii) “Settlement Date” means the date on which the value of the Performance Units is actually paid to the Participant.

10. Counterparts and Signatures. This Agreement may be signed in counterparts, each of which shall be an original, and all of which shall be construed together as a single instrument. This Agreement may be signed with electronic or facsimile signatures, and the instrument or a counterpart of the instrument so signed shall be an original with the same validity and effect as one with a physical signature.

11. Protected Conduct. Nothing in this Agreement (a) prohibits the Participant from reporting an event that the Participant reasonably and in good faith believes is a violation of law to the relevant law-enforcement agency (such as the Securities and Exchange Commission or Department of Labor), (b) requires notice to or approval from the Company before doing so, or (c) prohibits the Participant from cooperating in an investigation conducted by such a government agency. Further Participant is hereby advised that under the Defend Trade Secrets Act of 2016 (DTSA), no individual will be held criminally or civilly liable under federal, state or local trade secret law for the disclosure of a trade secret that: (i) is made in confidence to a federal, state, or local government official, either directly or indirectly, or to an attorney; and made solely for the purpose of reporting or investigating a suspected violation of law; or, (ii) is made in a complaint or other document filed in a lawsuit or other proceeding if such filing is made under seal. Also, the DTSA further provides that an individual who files a lawsuit for retaliation by an employer for reporting a suspected violation of the law may disclose the trade secret to the attorney of the individual and use the trade secret information in the court proceeding, if the individual files any document containing the trade secret under seal, and does not disclose the trade secret, except pursuant to court order. To the extent that the Participant is covered by Section 7 of the National Labor Relations Act (NLRA) because the Participant is not in a supervisor or management role, nothing in this Agreement shall be construed to prohibit the Participant from using information the Participant acquires regarding the wages, benefits, or other terms and conditions of employment at the Company for any purpose protected under the NLRA.

IN WITNESS WHEREOF, the parties have caused this Agreement to be executed effective as of January 1, 2023.

    W. R. Berkley Corporation

    By:    __________________________

Name:
    Title:

        ______________________________

    Participant

A. All States. The Participant is advised to consult with an attorney prior to accepting the award under this Agreement. The Obligations set forth in this Agreement are consideration for the benefits granted to the Participant hereunder and are designed, among other things, to protect the Company’s trade secrets. Participant has been provided a minimum of 14 days to review this Agreement before accepting its terms and conditions. This Agreement does not apply to the extent that Participant is not compensated in an amount exceeding any applicable minimum wage threshold established by the state in which Participant primarily resides and works or as otherwise provided by law. The inclusion of state law references in this Exhibit A does not mean that this Agreement constitutes a non-competition agreement.

B. California. For so long as the Participant primarily resides and works in California and is subject to the laws of California: (i) no provision or requirement of this Agreement, including Section 9(e) will be applied, construed or interpreted in a manner contrary to the express public policy of the State of California; (ii) the Obligations in Section 9(j)(xii)(A) shall not apply; (iii) Sections 9(j)(xii)(C) and (D) shall be limited to situations where the Participant is aided in his or her conduct by the Participant’s use or disclosure of trade secrets (as defined by applicable law); and (iv) Section 9(i) shall not apply.

C. Colorado. If Participant primarily resides and works in Colorado at the time of termination of employment, and is subject to the laws of Colorado, (i) no provision or requirement of this Agreement, including Section 9(e), will be applied, construed or interpreted in a manner contrary to the express public policy of the State of Colorado; (ii) the Obligations in Section 9(j)(xii)(A) shall only apply post-employment if at the time of the award and at the time of the alleged breach or Participant’s separation from employment with the Company, Participant received annualized cash compensation from the Company equivalent to or greater than the threshold amount for Highly Compensated Workers as specified under Colorado law, namely, in 2022, $101,250, as from time to time adjusted under Colorado law; (iii) the Obligations in 9(j)(xii)(B)-(D) shall only apply if at the time the award was granted and at the time of the alleged breach of Participant’s separation from employment with the Company, Participant received annualized cash compensation equivalent to or greater than sixty percent of the threshold amount for Highly Compensated Workers as specified under Colorado law, namely, in 2022, $60,750, as from time to time adjusted under Colorado law; and (iv) the first and last sentences of Section 9(e) is amended to replace “Delaware” with “Colorado.”

D. District of Columbia. If (i) the Participant spends more than 50% of his or her work time with the Company working in the District of Columbia (the “District”); or (ii) Participant’s employment for the Company is based in the District and the Participant regularly spends a

substantial amount of his or her work time for the Company in the District and not more than 50% of his or her work time for the Company in another jurisdiction; then (i) no provision or requirement of this Agreement will be applied, construed or interpreted in a manner contrary to the express public policy of the laws of the District of Columbia; (ii) the Obligations in Section 9(j)(xii)(A) shall only apply if the Participant is compensated by the Company more than $150,000 in 2022; this amount increases in proportion to the annual average increase, if any, in the Consumer Price Index for All Urban Consumers in the Washington Metropolitan Statistical Area published by the Bureau of Labor Statistics of the United States Department of Labor for the previous calendar year adjusted to the nearest whole dollar. This Agreement does not contain a non-compete agreement. The District of Columbia Ban on Non-Compete Agreements Amendment Act of 2020 limits the use of non-compete agreements. It allows employers to request non-compete agreements from “highly-compensated employees” under certain conditions. Based on the foregoing, the Company has determined that you are a highly-compensated employee. For more information about the Ban on Non-Compete Agreements Amendment Act of 2020, contact the District of Columbia Department of Employment Services.

E. Massachusetts. For so long as Massachusetts General Laws Part I Title XXI Chapter 149 Section 24 L applies to the obligations of Participant under this Agreement: (i) the Obligations in Sections 9(j)(xii)(A), (C) and (D) will only apply within any geographical area (x) where Participant had responsibilities on behalf of the Company or about which Participant received Confidential Information during the Look Back Period and (y) in which the Company is engaged in business; (ii) Section 9(j)(xii)(A) is further limited to situations where Participant is performing services that are the same as or similar in function or purpose to the services Participant performed for the Company (as appropriate) during the Look Back Period and are not enforceable if the Participant has been terminated without cause or laid off; (iii) the second and third sentences of Section 9(e) are amended to replace “Delaware” with “Massachusetts”; (iv) Section 5(d) is amended by inserting after the phrase “If at any time up to or including the last day of the Relevant Period” with the following: “and in no event longer than one year after the date the Participant terminates employment with the Company”; and (v) this Agreement is amended to add the following new Section 12:

SECTION 12. The Company and Participant agree that the grant of Performance Units to Participant is fair and reasonable consideration for the obligations of Participant in this Agreement. The Company and Participant agree that the grant of Performance Units is consideration for the Participant’s Obligations under Section 5(d) and Section 9(j)(xii)(A) (as applicable) of this Agreement (as such Obligations are modified by Exhibit A hereto) during the duration of such Obligations. For the avoidance of doubt, Participant has the right to consult with an attorney prior to accepting this award. Participant acknowledges that Participant has been given at least ten business days to accept this award.

F. North Dakota. For so long as the Participant resides in and is subject to the laws of North Dakota: (i) no provision or requirement of this Agreement shall be construed or interpreted in a manner contrary to the express public policy of the State of North Dakota; (ii) the Obligations in Section 9(j)(xii)(A) shall not apply; and (iii) Sections 9(j)(xii)(C) and (D) shall be limited to situations where the Participant is aided in his or her conduct by the Participant’s use or disclosure of trade secrets (as defined by applicable law).

G. Oklahoma. For so long as the Participant resides in and is subject to the laws of Oklahoma: (i) the Obligations in Section 9(j)(xii)(A) shall not apply and (ii) “Covered Business Partner” of the Company means any individual, company, or business entity (including, without limitation, any Client) with which the Company has transacted business within the Look Back Period and with which the Participant, or persons supervised by the Participant, had material business-related contact or about which the Participant had access to Confidential Information during the Look Back Period.

H. Puerto Rico. For so long as Participant primarily resides and works in the Commonwealth of Puerto Rico (“Puerto Rico”) and is subject to the laws of Puerto Rico: (i) the Obligations in Section 9(j)(xii)(A) shall only apply up to one year following such termination of employment with the Company in any geographical area within Puerto Rico where Participant had responsibilities on behalf of the Company or where Participant received Confidential Information during the one-year period prior to the termination of employment with the Company; (ii) Section 9(j)(xii)(A) is further limited to situations where Participant is performing services that are the same as or similar in function or purpose to the services Participant performed for the Company or its subsidiary/subsidiaries (as appropriate), or that call for the application of the same or similar specialized knowledge or skills as those utilized by Participant in the services Participant provided to the Company or its subsidiary/subsidiaries (as appropriate), during the one-year period prior to the termination of Participant’s employment with the Company or any subsidiary thereof; (iii) Section 9(j)(vi) is amended to read as follows: “Covered Business Partner” shall mean any person, concern or entity (including, without limitation, any Client) with respect to whom Participant did business on behalf of the Company or any subsidiary thereof, or who were personally served by Participant or as to which Participant received or learned of Confidential Information, during the most recent two years of Participant’s employment with the Company or any subsidiary thereof, or such shorter period of time as employed (the “Look Back Period”); and (iv) this Agreement is amended to add the following new Section 12:

“SECTION 12. The Company and Participant agree that the grant of the Performance Units to Participant is fair and reasonable consideration for the Participant’s Obligations under Section 5(d) and Section 9(j)(xii) of this Agreement (as such Obligations are modified by Exhibit A hereto). Participant acknowledges that Participant has been advised that Participant has the right to consult with an attorney prior to accepting this award.”

I. Washington. With respect to Participant’s post-employment obligations to the Company, for so long as Participant primarily resides and works in Washington and is subject to the laws of Washington: (a) the Obligations in Section 9(j)(xii)(A) shall only apply if Participant’s annualized earnings from the Company exceed the statutory wage threshold, which in 2023 is $116,593.18 per year, or, if Participant is a consultant, $291,482.95 (as adjusted annually in accordance with Section 5 of Washington HP 1450); (b) the Obligations in Section 9(j)(xii)(A) shall not be enforced against Participant if Participant is terminated from employment without cause or if Participant is laid off unless the Company pays the Participant during the Relevant Period an amount equal to the Participant’s base salary at the time of termination less any compensation earned by Participant during the Relevant Period; and (c) Section 9(e) shall not apply. Participant further understands that for the limited purposes of the application of Section

9(j)(xii)(A), “cause” to terminate Participant’s employment exists if Participant has (i) committed, admitted committing, or plead guilty to a felony or crime involving moral turpitude, fraud, theft, misappropriation, or dishonesty, (ii) violated a material term of this Agreement or Company policy, (iii) engaged in insubordination, or failed or refused to perform assigned duties of Participant’s position despite reasonable opportunity to perform, (iv) failed to exercise reasonable care and diligence in the exercise of Participant’s duties for the Company, or (iv) engaged in conduct or omissions that Participant knew, or should have known (with the exercise of reasonable care), would cause, or be likely to cause, harm to the Company or its reputation in the business community. Participant agrees that this grant of Performance Units is independent consideration for the Obligations.

II. Countries Other than the United States of America

A. Argentina. For an Argentinian resident, for so long as the Participant resides in Argentina and is subject to the laws of Argentina:

1.Section 9(e) shall be deleted in its entirety and replaced with the following:

“(e) This Agreement shall be construed and interpreted in accordance with the laws of Argentina. The Participant hereby irrevocably consents to the exclusive personal jurisdiction of the Argentine courts for the resolution of any disputes arising out of, or relating, to this Agreement.”

(ii) This Agreement shall not be effective unless the Participant physically signs an original Agreement.

B. Australia. For an Australian resident, for so long as the Participant resides in Australia and is subject to the laws of Australia:

a.Section 9(e) shall be deleted in its entirety and replaced with the following:

“(e) This Agreement shall be construed and interpreted in accordance with the laws of the State of New South Wales in Australia. The Participant hereby irrevocably consents to the personal jurisdiction of the federal and state courts of the State of New South Wales in Australia for the resolution of any disputes arising out of, or relating to, this Agreement.”

a.The provisions in “Addendum for Australia, Canada, Hong Kong and Singapore” set forth below shall be applicable.

C. Canada. For a Canadian resident, for so long as the Participant resides in Canada and is subject to the laws of Canada:

The provisions in “Addendum for Australia, Canada, Hong Kong and Singapore” set forth below shall be applicable.

D. Colombia. For a Colombian resident, for so long as the Participant resides in Colombia and is subject to the laws of Colombia:

The Participant agrees that the Performance Units rights derived from this Agreement are not consideration for the services rendered by the Participant in Colombia. For this Agreement to be effective, the Participant must enter into a local agreement, governed by Colombian laws, with the Participant’s current employer in which the Participant agrees to the statement in the prior sentence.

E. Hong Kong. For a Hong Kong resident, for so long as the Participant resides in Hong Kong and is subject to the laws of Hong Kong:

a.Section 6 shall be deleted in its entirety and replaced with the following:

SECTION 6. Non-Transferability. (a) Subject to Section 6(b) below and except as specifically consented to by the Committee, the Participant may not sell, transfer, pledge, or otherwise encumber or dispose of the Performance Units other than by will, the laws of descent and distribution, or as otherwise provided for in the Plan.

(b) Notwithstanding any other provisions of this Agreement, if the Participant resides in, or received this offer in Hong Kong, the Participant shall have no rights or entitlement to sell, transfer or otherwise dispose of the Performance Units, except if such sale, transfer or disposal is permitted pursuant to the Plan and specifically consented to by the Committee.

a.The provisions in “Addendum for Australia, Canada, Hong Kong and Singapore” set forth below shall be applicable.

F. Norway. For a Norwegian resident, for so long as Participant resides in Norway and is subject to the laws of Norway:

a.In Section 5(d), the words “or Solicitation” shall be added, in each instance after the word “Obligation(s)”;

a.In Section 5(d), in the first sentence, solely with respect to Solicitation, the phrase “Relevant Period” shall be replaced with “the first anniversary of the Settlement Date”;

a.In Section 9(j)(xii), subsections (C) and (D) shall be deleted and subsection (E) shall be renumbered as subsection (C); and

a.In Section 9(j), the following new subsection (xvii) shall be added:

“(xvii) ”Solicitation”. For purposes of this Agreement, the Participant has engaged in "Solicitation" if the Participant from the date hereof through the first anniversary of the Settlement Date, directly or indirectly (i) diverts, or attempts to divert, any person, concern or entity from doing business with the Company or attempts to induce any such person, concern or entity to cease being a customer of the Company, (ii) solicits the business of the Company or (iii) influences customers, suppliers and/or other business associates/contract parties of the Company to limit or terminate their relationship with the Company . With respect to customers, the preceding sentence only applies to customers which the Participant has had contact with and/or responsibility for during the last 12 months prior to the time of the written statement as mentioned below.

(v) In Section 5, a new subsection (f) shall be added:

(f) The Company may, upon the request from the Participant and in connection with termination, summary dismissal or other cessation of employment, decide whether and to what extent the Participant’s obligation to refrain from Solicitation shall be invoked. With respect to customers, the procedure in connection with such a decision shall comply with the mandatory provisions of Chapter 14A in the Norwegian Working Environment Act, including the specification of which customers are covered by the Participant’s obligation to refrain from Solicitation in a written statement.”

G. Singapore. For a Singaporean resident, for so long as the Participant resides in Singapore and is subject to the laws of the Republic of Singapore:

a.In first sentence of Section 5(d), the phrase “that, in the Committee’s sole and absolute discretion, reflects the seriousness of the breach of the Obligation(s) and/or Misconduct; the maximum amount that the Company may demand from the Participant is” shall be added after the words “an amount” ;

a. In Section 5(d), in the last sentence, all words following the phrase “pursuant to this provision” shall be deleted and replaced with “are reasonable.”

a. Section 9(e) shall be deleted in its entirety and replaced with the following:

“(e) This Agreement shall be construed and interpreted in accordance with the laws of the State of Delaware. The Participant hereby irrevocably consents to the personal jurisdiction of the courts of the Republic of Singapore for the resolution of any disputes arising out of, or relating to, this Agreement.”

a. The provisions in “Addendum for Australia, Canada, Hong Kong and Singapore” set forth below shall be applicable.

H. United Kingdom. For a United Kingdom resident, for so long as the Participant resides in the United Kingdom and is subject to the laws of England and Wales or if the Participant is employed under an employment contract which is governed by English law at the time of grant of the Performance Units: (i) in Section 4(b) the phrase “the Obligations set forth in Section 5(d)” shall be deleted and replaced with “the Obligations set forth in Exhibit A II. Countries other than the United States of America: United Kingdom” and (ii) the following terms and provisions shall amend and supersede the terms and provisions of Section 5(d), Section 9(e), Section 9(j)(iv), Section 9(j)(v), Section 9(j)(vi), Section 9(j)(xi), Section 9(j)(xii) and Section 9(j)(xiii) of this Agreement as follows:

3.5 In this Clause 3, “Cause” means: