UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 W. R. BERKLEY CORPORATION Form 10-Q (Exact name of registrant as specified in its charter) (Mark one) Delaware 22-1867895 ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 or 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Quarterly Period Ended June 30, 2025 or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the Transition Period from to . Commission File Number 1-15202 (State or other juris ...