MSM · Msc Industrial Direct Co Inc · Insider Trading

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.

Each RSU 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.

Each RSU represents a contingent right to receive one share of Common Stock.

4,692 RSUs were granted on October 3, 2022. 1,173 RSUs vested on each of October 3, 2023, October 3, 2024, October 3, 2025, and October 3, 2026.

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.

Includes 283.096 dividend equivalent units accrued on November 26, 2025, 305.921 dividend equivalent units accrued on January 28, 2026, 266.932 dividend equivalent units accrued on April 22, 2026, and 204.560 dividend equivalent units accrued on July 22, 2026, 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.

Each RSU represents a contingent right to receive one share of Common Stock.

12,575 RSUs were granted on September 14, 2026. 3,143 RSUs vest on September 14, 2027, and 3,144 RSUs vest on each of September 14, 2028, September 14, 2029, and September 14, 2030, 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.

Each RSU represents a contingent right to receive one share of Common Stock.

2,013 RSUs were granted on July 20, 2026. 503 RSUs vest on each of July 20, 2027, July 20, 2028 and July 20, 2029, and 504 RSUs vest on July 20, 2030, 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.

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 in an LLC jointly owned by the Reporting Person and the Reporting Person's spouse.

Disposition of indirect beneficial ownership as a result of distribution by a trust of which the Reporting Person?s spouse is 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 a trust of which the Reporting Person?s spouse is trustee.

Acquisition of indirect beneficial ownership by the Reporting Person as a result of a distribution by a trust.

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 a trust of which the Reporting Person is a co-trustee and beneficiary.

Acquisition of indirect beneficial ownership by the Reporting Person as a result of a distribution by a trust.

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 a trust of which the Reporting Person is a co-trustee and beneficiary.

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 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.

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.

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 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.

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 a trust of which the Reporting Person is a co-trustee and beneficiary.

Disposition of indirect beneficial ownership as a result of distribution by a trust.

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 trusts over whose trustee the Reporting Person can exercise remove and replace powers.

Each RSU represents a contingent right to receive one share of Common Stock.

1,390 RSUs were granted on January 24, 2024. 695 RSUs vested on each of January 24, 2025 and January 24, 2026.

Each RSU represents a contingent right to receive one share of Common Stock.

1,390 RSUs were granted on January 24, 2024. 695 RSUs vested on each of January 24, 2025 and January 24, 2026.

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.

Each RSU represents a contingent right to receive one share of Common Stock.

Each RSU represents a contingent right to receive one share of Common Stock.

1,390 RSUs were granted on January 24, 2024. 695 RSUs vested on each of January 24, 2025 and January 24, 2026.

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.

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.

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.

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.

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.

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.

Each RSU represents a contingent right to receive one share of Common Stock.

Each RSU represents a contingent right to receive one share of Common Stock.

Each RSU represents a contingent right to receive one share of Common Stock.

1,390 RSUs were granted on January 24, 2024. 695 RSUs vested on each of January 24, 2025 and January 24, 2026.

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.

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 Outside Director through the applicable vesting date. The vested shares will be delivered to the Reporting Person upon vesting.

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 Outside Director through the applicable vesting date. The vested shares will be delivered to the Reporting Person upon vesting.

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 Outside Director through the applicable vesting date. The vested shares will be delivered to the Reporting Person upon vesting.

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 Outside Director through the applicable vesting date. The vested shares will be delivered to the Reporting Person upon vesting.

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 Outside Director through the applicable vesting date. The vested shares will be delivered to the Reporting Person upon vesting.

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.

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 Outside Director through the applicable vesting date. The vested shares will be delivered to the Reporting Person upon vesting.

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.

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 Outside Director through the applicable vesting date. The vested shares will be delivered to the Reporting Person upon vesting.

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.

Includes 7.470 dividend equivalent units accrued on January 29, 2025, 25.876 dividend equivalent units accrued on April 23, 2025, 22.766 dividend equivalent units accrued on July 23, 2025, and 23.073 dividend equivalent units accrued on November 26, 2025 with respect to the 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.

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.

Each RSU represents a contingent right to receive one share of Common Stock.

1,598 RSUs were granted on January 22, 2025. 799 RSUs vested on January 22, 2026. 799 RSUs vest on January 22, 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.

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.