X0508 4 2025-11-03 0 0001003078 MSC INDUSTRIAL DIRECT CO INC MSM 0002065454 Reichelt John Joseph C/O MSC INDUSTRIAL DIRECT CO., INC. 515 BROADHOLLOW ROAD MELVILLE NY 11747 0 1 0 0 SVP, Chief Information Officer 0 Restricted Stock Units (RSU) 2025-11-03 4 A 0 1621 0 A Class A Common Stock, $0.001 par value 1621 1621 D Each RSU represents a contingent right to receive one share of Common Stock. 1,621 RSUs were granted on November 3, 2025. 405 RSUs vest on each of November 3, 2026, November 3, 2027, and November 3, 2028, and 406 RSUs vest on November 3, 2029, 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/ John Reichelt 2025-11-04