ACGL: Other company developments

ITEM 8.01 Other Events . Share Repurchase Program. On November 5, 2026, Arch Capital Group Ltd. (the “Company”) increased its authorization for its existing share repurchase program by $3.0 billion, which, as in the past, may be effected from time to time in open market or privately negotiated transactions. After taking into account this increased authorization and recent share repurchases, approximately $3.6 billion of share repurchases are available under the program as of November 5, 2026. The timing and amount of the repurchase transactions under this program will depend on a variety of factors, including market conditions and corporate and regulatory considerations. Preferred Share Dividends. On November 5, 2026, the Board of Directors (the “Board”) of ACGL declared dividends with respect to the outstanding 13,200,000 depositary shares, each representing a 1/1000th interest in a share of 5.45% Non-Cumulative Preferred Shares, Series F, $0.01 per share (“Series F Shares”), with a $25,000 liquidation preference per share (equivalent to a $25.00 liquidation preference per depositary share), as outlined below. All such dividends will be payable out of lawfully available funds for the payment of dividends under Bermuda law on December 31, 2026 to holders of record of the Series F Shares, as of December 15, 2026, unless determined otherwise by the Board or the Executive Committee of the Board on or prior to the effective date. Series Effective Date for Declaration Dividend Period Dividend Amount Rate Per Share Series F 12/31/26 9/30/26-12/30/26 $4,496,250 $0.340625 In addition, on November 5, 2026, the Board of ACGL declared dividends with respect to the outstanding 20,000,000 depositary shares, each representing a 1/1000th interest in a share of 4.55% Non-Cumulative Pre