Sec Form 4 Filing - Welt Philip S @ BERKLEY W R CORP - 2022-08-15

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Welt Philip S 2. Issuer Name and Ticker or Trading Symbol BERKLEY W R CORP [ WRB] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) EVP, GC & Secretary (Last) (First) (Middle) W. R. BERKLEY CORPORATION, 475 STEAMBOAT ROAD 3. Date of Earliest Transaction (MM/DD/YY) 08/15/2022 (Street) GREENWICH, CT06830 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 08/15/2022 A 3,686( 1 ) A $ 0 105,065( 2 ) D Common Stock 08/15/2022 F 417( 3 ) D $ 65.78 104,648( 4 ) D Common Stock 14,728( 5 ) I By ESPP

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Welt Philip S W. R. BERKLEY CORPORATION 475 STEAMBOAT ROAD GREENWICH, CT06830 EVP, GC & Secretary Signatures Philip S. Welt 08/17/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents the vesting of a tranche of performance-based restricted stock units ("RSUs") granted in 2019 under the W. R. Berkley Corporation 2018 Stock Incentive Plan for the three-year performance period ending June 30, 2022. ( 2 )On March 23, 2022, the Company's common stock split on a 3-for-2 basis (the "Stock Split"), resulting in an increase of 14,229 shares of common stock underlying vested RSUs beneficially owned by the reporting person. ( 3 )Represents payment of tax liability by withholding securities incident to the vesting of RSUs. ( 4 )Includes 55,126 shares of common stock underlying RSUs, 52,179 of which have vested (the receipt of which has been deferred) and the balance of 2,947 is scheduled to vest on August 15, 2023; and does not include unvested shares of common stock underlying performance-based RSUs. ( 5 )Includes an increase of 4,847 shares of common stock beneficially owned resulting from the Stock Split.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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