Martina McIsaac - 03 Oct 2025 Form 4 Insider Report for MSC INDUSTRIAL DIRECT CO INC (MSM)

Role: President & COO
Signature: /s/ Martina McIsaac
Issuer symbol: MSM
Transactions as of: 03 Oct 2025
Net transactions value: -$29,423
Form type: 4
Filing time: 07 Oct 2025, 12:15:35 UTC
Previous filing: 06 Nov 2024
Next filing: 05 Nov 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
McIsaac Martina	President & COO	C/O MSC INDUSTRIAL DIRECT CO., INC., 515 BROADHOLLOW ROAD, MELVILLE	/s/ Martina McIsaac	07 Oct 2025	0001947693

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MSM	Class A Common Stock, $0.001 par value	Options Exercise	$0	+1,173	+26%	$0.000000	5,607	03 Oct 2025	Direct	F1
transaction	MSM	Class A Common Stock, $0.001 par value	Options Exercise	$0	+140	+2.5%	$0.000000	5,747	03 Oct 2025	Direct	F2
transaction	MSM	Class A Common Stock, $0.001 par value	Tax liability	$29,423	-320	-5.6%	$91.99	5,427	03 Oct 2025	Direct	F3

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	MSM	Restricted Stock Units (RSU)	Options Exercise	$0	-1,173	-50%	$0.000000	1,173	03 Oct 2025	Class A Common Stock, $0.001 par value	1,173		Direct	F1, F4
transaction	MSM	Dividend Equivalent Units	Options Exercise	$0	-140	-14%	$0.000000	875	03 Oct 2025	Class A Common Stock, $0.001 par value	140		Direct	F2, F5

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Each RSU represents a contingent right to receive one share of Common Stock.
F2	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.
F3	Disposition of Class A Common Stock to the Issuer to cover tax withholding obligations arising from the vesting of RSUs and DEUs.
F4	4,692 RSUs were granted on October 3, 2022. 1,173 RSUs vested on each of October 3, 2023, October 3, 2024 and October 3, 2025. 1,173 RSUs vest on October 3, 2026, 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.
F5	Includes 134.917 dividend equivalent units accrued on November 27, 2024, 142.722 dividend equivalent units accrued on January 29, 2025, 153.957 dividend equivalent units accrued on April 23, 2025, and 135.450 dividend equivalent units accrued on July 23, 2025, with respect to outstanding award 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.