ACGL: Financial results

ITEM 2.02 Results of Operations and Financial Condition . On October 27, 2026 Arch Capital Group Ltd. issued a press release reporting its earnings and the availability of its financial supplement for the quarter ended September 30, 2026. The press release and financial supplement are attached to this Current Report on Form 8-K as Exhibit 99.1 and Exhibit 99.2, respectively, and are incorporated herein by reference. The information in this Current Report on Form 8-K, including the information set forth in Exhibit 99.1 and Exhibit 99.2, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing. ITEM 9.01 Financial Statements and Exhibits . (d): The following exhibits are being filed herewith. EXHIBIT NO. DESCRIPTION 99.1 Press Release dated October 27, 2026 announcing the earnings of Arch Capital Group Ltd. for the quarter ended September 30, 2026 99.2 2026 Third Quarter Financial Supplement 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: October 27, 2026 By: /s/ François Morin Name: François Morin Title: Executive Vice President, Chief Financial Officer and Treasurer 3