X0508 4 2025-12-17 0 0001003078 MSC INDUSTRIAL DIRECT CO INC MSM 0002086182 Rockett Julie Valsa C/O MSC INDUSTRIAL DIRECT CO., INC. 515 BROADHOLLOW ROAD MELVILLE NY 11747 0 1 0 0 VP, Chief People Officer 0 Class A Common Stock, $0.001 par value 2025-12-17 4 M 0 20 0 A 1470 D Class A Common Stock, $0.001 par value 2025-12-17 4 M 0 0.834 0 A 1471 D Class A Common Stock, $0.001 par value 2025-12-17 4 F 0 6.843 86.10 D 1464 D Restricted Stock Units (RSU) 2025-12-17 4 M 0 20 0 D Class A Common Stock, $0.001 par value 20 41 D Dividend Equivalent Units 2025-12-17 4 M 0 0.834 0 D Class A Common Stock, $0.001 par value 0.834 54 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. 61 RSUs were granted on December 17, 2024. 20 RSUs vested on December 17, 2025. 20 RSUs vest on December 17, 2026, and 21 RSUs vest on December 17, 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 12.696 dividend equivalent units accrued on November 26, 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/ Julie Rockett 2025-12-18