ARCH CAPITAL GROUP LTD

Evaluation of Disclosure Controls and Procedures

In connection with the filing of this Form 10-Q, our management, with the participation of our Chief Executive Officer and Chief Financial Officer, conducted an evaluation of the Company’s disclosure controls and procedures, as of the end of the period covered by this report, for the purposes set forth in the applicable rules under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Based on that evaluation and subject to the below, our Chief Executive Officer and Chief Financial Officer concluded that the Company’s disclosure controls and procedures were effective as of the end of the period covered by this report. Disclosure controls and procedures are the controls and other procedures designed to ensure that information required to be disclosed in the reports filed or submitted under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and that such information is accumulated and communicated to management, including the Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

On August 1, 2024, we completed the MCE Acquisition, and we are currently integrating the MCE Acquisition into our internal control system. Consistent with guidance issued by the SEC, we are excluding the internal control over financial reporting of MCE Acquisition from our evaluation of the effectiveness of our disclosure controls and procedures described above as of March 31, 2025. The MCE Acquisition represents 1.3% of total assets, and 8.2% of total revenues as of March 31, 2025.

Changes in Internal Control Over Financial Reporting

Other than the item noted above, there have been no changes in internal control over financial reporting that occurred during the quarter ended March 31, 2025 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.