BERKLEY W R CORP (WRB) · Insider Trading (Form 4) SEC Filing

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-08-03 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: BERKLEY W R CORP (WRB) CIK: 0000011544 --- Reporting Owner --- Name: BERKLEY WILLIAM R JR CIK: 0001236253 Role: Director, Officer (Chairman, President and CEO), 10%+ Owner --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-08-03 | Code: A (Grant or award) Shares: +98,593 | Price: $0.00 Shares Owned After: 4,654,453 | Ownership: D (Direct) Footnotes: [F1] Represents the vesting of tranches of performance-based restricted stock units ("RSUs") granted in 2021, 2022 and 2023 under the W. R. Berkley Corporation 2018 Stock Incentive Plan for the three-year performance period ending June 30, 2026 (consisting of 38,841 shares; 29,264 shares; and 30,488 shares, respectively). [Transaction #2] Security: Common Stock Date: 2026-08-03 | Code: F (Payment of exercise/tax) Shares: -4,139 | Price: $72.29 Total Value: $299,197.96 Shares Owned After: 4,650,314 | Ownership: D (Direct) Footnotes: [F2] Represents payment of tax liability by withholding securities incident to the vesting of RSUs. [F3] Includes 3,275,694 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. --- Holdings --- [Holding #1] Security: Common Stock Ownership: I (Indirect) Footnotes: [F4] Mr. William R. Berkley, Jr. is the manager of the limited liability company. The estate of William R. Berkley (the "Estate") and certain family trusts are the owners of the limited liability company, as set forth in the Schedule 13D/A dated July 21, 2026. [Holding #2] Security: Common Stock Ownership: I (Indirect) Footnotes: [F4] Mr. William R. Berkley, Jr. is the manager of the limited liability company. The estate of William R. Berkley (the "Estate") and certain family trusts are the owners of the limited liability company, as set forth in the Schedule 13D/A dated July 21, 2026. [Holding #3] Security: Common Stock Ownership: I (Indirect) [Holding #4] Security: Common Stock Ownership: I (Indirect) Footnotes: [F5] The reporting person is co-executor of the Estate. --- Footnotes (Complete Index) --- F1: Represents the vesting of tranches of performance-based restricted stock units ("RSUs") granted in 2021, 2022 and 2023 under the W. R. Berkley Corporation 2018 Stock Incentive Plan for the three-year performance period ending June 30, 2026 (consisting of 38,841 shares; 29,264 shares; and 30,488 shares, respectively). F2: Represents payment of tax liability by withholding securities incident to the vesting of RSUs. F3: Includes 3,275,694 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. F4: Mr. William R. Berkley, Jr. is the manager of the limited liability company. The estate of William R. Berkley (the "Estate") and certain family trusts are the owners of the limited liability company, as set forth in the Schedule 13D/A dated July 21, 2026. F5: The reporting person is co-executor of the Estate. --- Signature --- /s/ William R. Berkley, Jr. (2026-08-05)