X0508 4 2025-10-30 0 0001003078 MSC INDUSTRIAL DIRECT CO INC MSM 0001008015 JACOBSON MITCHELL C/O MSC INDUSTRIAL DIRECT CO., INC. 515 BROADHOLLOW ROAD MELVILLE NY 11747 1 0 1 0 0 Class A Common Stock 2025-10-30 4 P 0 95779 84.9244 A 2219295 D Class A Common Stock 2025-10-31 4 P 0 34073 84.7641 A 2253368 D Class A Common Stock 2025-11-03 4 P 0 21954 83.9296 A 2275322 D Class A Common Stock 2025-11-03 4 P 0 30000 84.7900 A 2305322 D Class A Common Stock 2896500 I See footnotes Class A Common Stock 2882913 I See footnotes The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein. Represents shares held by trusts of which the Reporting Person is the settlor and over whose trustees the Reporting Person can exercise remove and replace powers. Represents shares held by Grantor Retained Annuity Trusts of which the Reporting Person is the settlor, sole annuitant and trustee, and other trusts over whose portfolio securities the Reporting Person exercises voting or dispositive power. The price shown in Column 4 is a weighted average price. The price range is $84.5550 to $85.0000. The Reporting Person undertakes to provide upon request by the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, full information regarding the number of shares transacted at each separate price. The price shown in Column 4 is a weighted average price. The price range is $84.4150 to $85.0000. The Reporting Person undertakes to provide upon request by the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, full information regarding the number of shares transacted at each separate price. The price shown in Column 4 is a weighted average price. The price range is $83.6000 to $84.2500. The Reporting Person undertakes to provide upon request by the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, full information regarding the number of shares transacted at each separate price. /s/ J. Robert Small, as attorney-in-fact for Mitchell Jacobson 2025-11-03