UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2026 OR Commission file number 1-5684 W.W. Grainger, Inc. (Exact name of registrant as specified in its charter) Illinois 36-1150280 (State or other jurisdiction of incorporation or organization) 100 Grainger Parkway Lake Forest, Illinois 60045-5201 (Address of principal executive office ...