X0508 4 2025-11-04 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 2025-11-04 4 M 0 378 0 A 3818 D Class A Common Stock, $0.001 par value 2025-11-04 4 M 0 45.065 0 A 3863 D Class A Common Stock, $0.001 par value 2025-11-04 4 F 0 122.065 86.42 D 3741 D Class A Common Stock, $0.001 par value 2025-11-04 4 M 0 698 0 A 4439 D Class A Common Stock, $0.001 par value 2025-11-04 4 M 0 29.254 0 A 4468 D Class A Common Stock, $0.001 par value 2025-11-04 4 F 0 209.254 86.42 D 4259 D Restricted Stock Units (RSU) 2025-11-04 4 M 0 378 0 D Class A Common Stock, $0.001 par value 378 379 D Dividend Equivalent Units 2025-11-04 4 M 0 45.065 0 D Class A Common Stock, $0.001 par value 45.065 257 D Restricted Stock Units (RSU) 2025-11-04 4 M 0 698 0 D Class A Common Stock, $0.001 par value 698 2096 D Dividend Equivalent Units 2025-11-04 4 M 0 29.254 0 D Class A Common Stock, $0.001 par value 29.254 228 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. 1,513 RSUs were granted on November 4, 2022. 378 RSUs vested on each of November 4, 2023, November 4, 2024 and November 4, 2025. 379 RSUs vest on November 4, 2026, 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. 2,794 RSUs were granted on November 4, 2024. 698 RSUs vested on November 4, 2025. 698 RSUs vest on November 4, 2026, and 699 RSUs vest on each of November 4, 2027 and November 4, 2028, 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/ Neal Dongre 2025-11-06