X0508 4 2026-01-23 0 0001003078 MSC INDUSTRIAL DIRECT CO INC MSM 0001200390 GERSHWIND ERIK 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 2026-01-27 4 J 0 12647 0 A 73764 I See footnotes Class A Common Stock, $0.001 par value 2026-01-27 4 J 0 69452 0 D 4222 I See footnotes Class A Common Stock, $0.001 par value 2026-01-27 4 J 0 12020 0 A 12020 I See footnotes Class A Common Stock, $0.001 par value 2026-01-27 4 J 0 69452 0 D 285511 I See footnotes Class A Common Stock, $0.001 par value 2026-01-27 4 J 0 69452 0 A 69452 I See footnotes Class A Common Stock, $0.001 par value 2026-01-27 4 J 0 69452 0 D 0 I See footnotes Class A Common Stock, $0.001 par value 2026-01-27 4 G 0 69452 0 A 1639359 D Class A Common Stock, $0.001 par value 2026-01-27 4 J 0 69452 0 D 0 I See footnotes Class A Common Stock, $0.001 par value 44513 I See footnotes Restricted Stock Units (RSU) 2026-01-23 4 A 0 1603 0 A Class A Common Stock, $0.001 par value 1603 1603 D Acquisition of indirect beneficial ownership by the Reporting Person as a result of a distribution by a trust. Disposition of indirect beneficial ownership as a result of distribution by a trust. Acquisition of indirect beneficial ownership by the Reporting Person as a result of a distribution by a trust. Disposition of indirect beneficial ownership as a result of distribution by a trust. Acquisition of indirect beneficial ownership by the Reporting Person as a result of a distribution by a trust by to a trust of which the Reporting Person?s spouse is trustee. Disposition of indirect beneficial ownership as a result of distribution by a trust of which the Reporting Person?s spouse is trustee. Acquisition of direct beneficial ownership by the Reporting Person as a result of a gift from the Reporting Person?s spouse. Disposition of indirect beneficial ownership as a result of distribution by a trust, of which the Reporting Person is a trustee. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest in such securities. Represents shares held by Grantor Retained Annuity Trusts of which the Reporting Person is the sole annuitant and trustee. Represents shares held by trusts over whose trustee the Reporting Person can exercise remove and replace powers. Represents shares held by a trust of which the Reporting Person?s spouse is trustee. Represents shares held by a trust of which the Reporting Person is a co-trustee and beneficiary. Represents shares held by a Trust of which the Reporting Person is a trustee. Following completion of the transactions reported herein, the Reporting Person ceased to be the trustee of such trust. As a result, the amount shown in Column 8 of Table 1 is reported as zero. Each RSU 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 a Non-executive Director through the applicable vesting date. The vested shares will be delivered to the Reporting Person upon vesting. The Reporting Person has ceased to be an officer of the Issuer, effective December 31, 2025. /s/ Erik Gershwind 2026-01-27