X0508 4 2025-11-03 0 0001003078 MSC INDUSTRIAL DIRECT CO INC MSM 0001921892 Dongre Neal C/O MSC INDUSTRIAL DIRECT CO., INC. 515 BROADHOLLOW ROAD MELVILLE NY 11747 0 1 0 0 SVP, Gen Counsel & Corp Sec 0 Class A Common Stock, $0.001 par value 2025-11-03 4 M 0 447 0 A 3543 D Class A Common Stock, $0.001 par value 2025-11-03 4 M 0 35.711 0 A 3579 D Class A Common Stock, $0.001 par value 2025-11-03 4 F 0 138.711 84.79 D 3440 D Restricted Stock Units (RSU) 2025-11-03 4 A 0 2653 0 A Class A Common Stock, $0.001 par value 2653 2653 D Restricted Stock Units (RSU) 2025-11-03 4 M 0 447 0 D Class A Common Stock, $0.001 par value 447 895 D Dividend Equivalent Units 2025-11-03 4 M 0 35.711 0 D Class A Common Stock, $0.001 par value 35.711 303 D Each RSU represents a contingent right to receive one share of Common Stock. The dividend equivalent units accrued with respect to outstanding awards of restricted stock units (RSUs) and vest at the same time(s) as the underlying RSUs. Each dividend equivalent unit represents a contingent right to receive one share of Common Stock. Disposition of Class A Common Stock to the Issuer to cover tax withholding obligations arising from the vesting of RSUs and DEUs. 2,653 RSUs were granted on November 3, 2025. 663 RSUs vest on each of November 3, 2026, November 3, 2027 and November 3, 2028, and 664 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. 1,789 RSUs were granted on November 3, 2023. 447 RSUs vested on each of November 3, 2024 and November 3, 2025. 447 RSUs vest on November 3, 2026, and 448 RSUs vest on November 3, 2027, 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. Includes 51.473 dividend equivalent units accrued on November 27, 2024, 54.452 dividend equivalent units accrued on January 29, 2025, 58.740 dividend equivalent units accrued on April 23, 2025 and 51.678 dividend units accrued on July 23, 2025 with respect to outstanding awards of restricted stock units (RSUs). Such dividend equivalent units vest at the same time(s) as the underlying RSUs and represent a contingent right to receive one share of Common Stock. /s/ Neal Dongre 2025-11-04