X0508 4 2026-01-23 0 0001003078 MSC INDUSTRIAL DIRECT CO INC MSM 0001194353 PALADINO STEVEN C/O MSC INDUSTRIAL DIRECT CO., INC. 515 BROADHOLLOW ROAD MELVILLE NY 11747 1 0 0 0 0 Class A Common Stock, $0.001 par value 2026-01-24 4 M 0 695 0 A 15478 D Class A Common Stock, $0.001 par value 2026-01-24 4 M 0 50 0 A 15528 D Restricted Stock Units (RSU) 2026-01-23 4 A 0 1603 0 A Class A Common Stock, $0.001 par value 1603 1603 D Restricted Stock Units (RSU) 2026-01-24 4 M 0 695 0 D Class A Common Stock, $0.001 par value 695 0 D Dividend Equivalent Units 2026-01-24 4 M 0 50 0 D Class A Common Stock, $0.001 par value 50 25 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. 1,603 RSUs were granted on January 23, 2026, and vest on January 23, 2027, provided that the Reporting Person continues to serve as Outside Director through the applicable vesting date. The vested shares will be delivered to the Reporting Person upon vesting. 1,390 RSUs were granted on January 24, 2024. 695 RSUs vested on each of January 24, 2025 and January 24, 2026. /s/ Steven Paladino 2026-01-27