X0609 4 2026-09-14 0 0001003078 MSC INDUSTRIAL DIRECT CO INC MSM 0001748108 Kuhns Robert M false C/O MSC INDUSTRIAL DIRECT CO., INC. 515 BROADHOLLOW ROAD MELVILLE NY 11747 0 1 0 0 EVP, Chief Financial Officer 0 Restricted Stock Units (RSU) 2026-09-14 4 A 0 12575 0 A Class A Common Stock, $0.001 par value 12575 12575 D Each RSU represents a contingent right to receive one share of Common Stock. 12,575 RSUs were granted on September 14, 2026. 3,143 RSUs vest on September 14, 2027, and 3,144 RSUs vest on each of September 14, 2028, September 14, 2029, and September 14, 2030, provided that the Reporting Person remains continuously employed by the Issuer through each applicable vesting date. The vested shares will be delivered to the Reporting Person upon vesting. /s/ Robert M. Kuhns 2026-09-15