ACGL: 10-Q financial filing

acgl-20260930 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2026 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number: 001-16209 ARCH CAPITAL GROUP LTD. (Exact name of registrant as specified in its charter) Bermuda 98-0374481 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.) Waterloo House, Ground Floor 100 Pitts Bay Road, Pembroke HM 08, Bermuda (441) 278-9250 (Address of principal executive offices) (Registrant’s telephone number, including area code) Securities registered pursuant to Section 12(b) of the Exchange Act: Title of each class Trading Symbol (s) Name of each exchange on which registered Common shares, $0.0011 par value per share ACGL NASDAQ Stock Market Depositary shares, each representing a 1/1000th interest in a 5.45% Series F preferred share ACGLO NASDAQ Stock Market Depositary shares, each representing a 1/1000th interest in a 4.55% Series G preferred share ACGLN NASDAQ Stock Market Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☑ No ☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorte