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 OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      
1. Name and Address of Reporting Person * BERKLEY WILLIAM R 2. Issuer Name and Ticker or Trading Symbol BERKLEY W R CORP [ WRB ] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable)__X__ Director                    __X__ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
Executive Chairman
(Last)         (First)         (Middle)
W. R. BERKLEY CORPORATION, 475 STEAMBOAT ROAD
3. Date of Earliest Transaction (MM/DD/YYYY)
8/5/2021
(Street)
GREENWICH, CT 06830
(City)       (State)       (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)
 
6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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  8/5/2021    A    30512 (1) A $0  7442976  D   
Common Stock  8/5/2021    F    1164 (2) D $72.225  7441812 (3) D   
Common Stock                 29808460  I  By WR Berkley & Others LLC 
Common Stock                 600000  I  By William R. Berkley 2011 GST Trust 
Common Stock                 90829  I  By spouse 

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 7. Title and Amount of Securities Underlying Derivative Security
(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

Explanation of Responses:
(1)  Represents the vesting of a tranche of performance-based restricted stock units ("RSUs") granted in 2016 under the W. R. Berkley Corporation 2018 Stock Incentive Plan (or its predecessor plan) for the three-year performance period ending June 30, 2021.
(2)  Represents payment of tax liability by withholding securities incident to the vesting of performance-based RSUs.
(3)  Includes 3,118,213 shares of common stock underlying RSUs, all of which have vested (the receipt of which has been deferred) and does not include unvested shares of common stock underlying performance-based RSUs.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
BERKLEY WILLIAM R
W. R. BERKLEY CORPORATION
475 STEAMBOAT ROAD
GREENWICH, CT 06830
X X Executive Chairman

Signatures
William R. Berkley 8/9/2021
**Signature of Reporting Person Date
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