Insider Transaction Report for ARCH CAPITAL GROUP LTD.

This filing details a transaction by Brian S. Posner, a director at ARCH CAPITAL GROUP LTD. (ACGL). On May 11, 2026, Mr. Posner disposed of 2,000 Depositary Shares, Series G, at a weighted average price of $17.1415 per share. The sale occurred in multiple transactions with prices ranging from $17.14 to $17.17. Following this transaction, Mr. Posner holds no shares of this series. Each Depositary Share represents a 1/1,000th interest in a Series G Non-Cumulative Preferred Share. The full details of sales at specific prices within the range are available upon request.