Distribution Solutions Group, Inc.

Evaluation of Disclosure Controls and Procedures

Under the supervision and with the participation of our senior management, including our Chief Executive Officer and Chief Financial Officer, we conducted an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures, as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the

“Exchange Act”), as of the end of the period covered by this report (the “Evaluation Date”). Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded as of the Evaluation Date that our disclosure controls and procedures were effective as of the Evaluation Date.

Changes in Internal Control over Financial Reporting

Given the timing of the Eastern Valve Transaction and the complexity of systems and business processes, we intend to exclude Eastern Valve from our assessment and report on internal control over financial reporting for the year ending December 31, 2026. Other than the Eastern Valve Transaction, there were no changes in our internal control over financial reporting, as defined in Rules 13a-15(f) and 15d-15(f) of the Exchange Act, during the quarter ended June 30, 2026 that materially affected or are reasonably likely to materially affect our internal control over financial reporting.