ACGL: Other company developments

ITEM 8.01 Other Events . On June 15, 2026, Arch Capital Group Ltd. (“ACGL”) issued a press release (the “Early Results and Increased Maximum Amount Press Release”) announcing the early results for the previously announced cash tender offers (the “Tender Offers”) by its wholly-owned subsidiaries (x) Arch Capital Group (U.S.) Inc. of its outstanding 5.144% Senior Notes due 2043 and (y) Arch Capital Finance LLC of its outstanding 5.031% Senior Notes due 2046, for an increased aggregate principal amount of up to $417,851,000 (the “Maximum Amount”). On June 16, 2026, ACGL issued a press release (the “Pricing Press Release”) announcing the pricing of the Tender Offers. A copy of the Early Results and Increased Maximum Amount Press Release and the Pricing Press Release are attached hereto as Exhibit 99.1 and Exhibit 99.2, respectively, and incorporated by reference herein. ITEM 9.01 Financial Statements and Exhibits . (d): The following exhibits are being filed herewith. EXHIBIT NO. DESCRIPTION 99.1 Press Release, dated June 15, 2026. 99.2 Press Release, dated June 16, 2026. 104 Cover Page Interactive Data File (embedded within the Inline XBRL document) 2 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. ARCH CAPITAL GROUP LTD. Date: June 16, 2026 By: /s/ François Morin Name: François Morin Title: Executive Vice President, Chief Financial Officer and Treasurer 3