W.W. GRAINGER, INC.

Disclosure Controls and Procedures

The Company, under the supervision and with the participation of its management, including the Chief Executive Officer and the Chief Financial Officer, evaluated the effectiveness of Grainger's disclosure controls and procedures (as defined in Rule 13a-15(e)) under the Securities Exchange Act of 1934, as amended (the Exchange Act) as of the end of the period covered by this quarterly report. Based upon that evaluation, the Chief Executive Officer and the Chief Financial Officer concluded that Grainger’s disclosure controls and procedures were effective as of the end of the period covered by this report in (i) ensuring that information required to be disclosed by Grainger in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC's rules and forms and (ii) ensuring that information required to be disclosed by the Company in the reports that it files or submits under the Exchange Act 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 decisions regarding required disclosures.

Changes in Internal Control Over Financial Reporting

There were no changes in Grainger's internal control over financial reporting for the quarter ended September 30, 2025, that have materially affected, or are reasonably likely to materially affect, Grainger’s internal control over financial reporting.

PART II – OTHER INFORMATION

For an update to the description of the Company’s legal proceedings, see Note 8 of the Notes to Condensed Consolidated Financial Statements included in Part I, Item 1: Financial Information of this Form 10-Q.