INSIGHT ENTERPRISES INC

(a)Management’s Annual Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)). Our management, including our Chief Executive Officer and Chief Financial Officer, conducted an evaluation of the effectiveness of our internal control over financial reporting as of December 31, 2024. In making this assessment, our management used the criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”). Management has concluded that the Company maintained effective internal control over financial reporting as of December 31, 2024, based on the criteria established in COSO’s Internal Control – Integrated Framework (2013).

KPMG LLP, the independent registered public accounting firm that audited the Consolidated Financial Statements in Part II, Item 8 of this report, has issued an attestation report on the Company’s internal control over financial reporting as of December 31, 2024.

(b)Changes in Internal Control Over Financial Reporting

There was no change in our internal control over financial reporting during the quarter ended December 31, 2024 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

(c)Disclosure Controls and Procedures

We maintain disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act). Our Chief Executive Officer and Chief Financial Officer, as of the end of the period covered by this report, evaluated the effectiveness of our disclosure controls and procedures and determined that as of December 31, 2024 our disclosure controls and procedures were effective to ensure that information required to be disclosed by us in reports that we file or submit 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 our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

(d)Inherent Limitations of Disclosure Controls and Internal Control Over Financial Reporting

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Projections of any evaluation of effectiveness to future periods are subject to risks that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.