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: Baio Richard Mark CIK: 0001463038 Role: Officer (EVP & CFO) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-08-03 | Code: A (Grant or award) Shares: +14,086 | Price: $0.00 Shares Owned After: 228,261 | 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 5,550 shares; 4,181 shares; and 4,355 shares, respectively). [Transaction #2] Security: Common Stock Date: 2026-08-03 | Code: F (Payment of exercise/tax) Shares: -650 | Price: $72.29 Total Value: $46,986.88 Shares Owned After: 227,611 | Ownership: D (Direct) Footnotes: [F2] Represents payment of tax liability by withholding securities incident to the vesting of RSUs. [F3] Includes 224,986 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 (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 5,550 shares; 4,181 shares; and 4,355 shares, respectively). F2: Represents payment of tax liability by withholding securities incident to the vesting of RSUs. F3: Includes 224,986 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. --- Signature --- /s/ Richard M. Baio (2026-08-05)