CDW Corp

Evaluation of Disclosure Controls and Procedures

The Company’s management, with the participation of the Company’s Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of the Company’s disclosure controls and procedures (as such term is defined in Rule 13a-15(e) or Rule 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. Based on such evaluation, the Company’s management, including the Company’s Chief Executive Officer and Chief Financial Officer, has concluded that, as of the end of such period, the Company’s disclosure controls and procedures were effective in recording, processing, summarizing and reporting, on a timely basis, information required to be disclosed by the Company in the reports that it files or submits under the Exchange Act, and that information is accumulated and communicated to the Company’s management, including the Company’s Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely discussions regarding required disclosure.

Changes in Internal Control over Financial Reporting

During the three months ended September 30, 2025, the Company implemented a new enterprise resource planning (“ERP”) system. As a result of this implementation, the Company made certain changes to its internal controls over financial reporting related to the associated processes. The Company will continue to monitor further changes, if any, during subsequent periods to evaluate the effectiveness of internal controls over financial reporting.

Except for the ERP implementation and associated processes, there have not been any other changes in the Company’s internal control over financial reporting during the three months ended September 30, 2025 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II—OTHER INFORMATION