Item 8.01 Other Events. On June 9, 2026, W. R. Berkley Corporation (the “Company”) issued a press release announcing the passing of the Company’s founder and Executive Chairman, William R. Berkley. The press release is attached as Exhibit 99.1 and is incorporated by reference herein. In connection therewith, the Company’s Board of Directors appointed W. Robert Berkley, Jr., the Company’s President and Chief Executive Officer, as Chairman. W. R. Berkley Corporation 4 Item 9.01 Financial Statements and Exhibits. (d) Exhibits Exhibit 99.1 Press Release, issued June 9, 2026. Exhibit 104 Cover Page Interactive Data File (the cover page XBRL tags are embedded within the Inline XBRL document) W. R. Berkley Corporation 5 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. W. R. BERKLEY CORPORATION By: /s/ Richard M. Baio Name: Richard M. Baio Title: Executive Vice President - Chief Financial Officer Date: June 10, 2026