[Form 4] MSC INDUSTRIAL DIRECT CO INC Insider Trading Activity

Rhea-AI Filing Summary

MSC Industrial Direct (MSM) President & COO Martina McIsaac reported equity award activity. On November 3, 2025, she received a new grant of 20,049 restricted stock units (RSUs), each representing one share of Class A common stock. On the same date, 959 RSUs and 76.614 dividend equivalent units (DEUs) converted into shares at $0. To cover taxes from vesting, 252.614 shares were withheld at $84.79.

Following these transactions, she directly owned 6,210 Class A shares. The new 2025 RSU grant is scheduled to vest 5,012 shares on each of Nov 3, 2026, 2027, and 2028, and 5,013 shares on Nov 3, 2029, subject to continued employment. From a prior 2023 grant, 959 RSUs vested on Nov 3, 2025, with 959 RSUs vesting on each of Nov 3, 2026 and Nov 3, 2027.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

McIsaac Martina

(Last) (First) (Middle)

C/O MSC INDUSTRIAL DIRECT CO., INC.

515 BROADHOLLOW ROAD

(Street)

MELVILLE NY 11747

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
MSC INDUSTRIAL DIRECT CO INC [ MSM ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President & COO

3. Date of Earliest Transaction (Month/Day/Year)
11/03/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock, $0.001 par value	11/03/2025		M		959	A	$0(1)	6,386	D
Class A Common Stock, $0.001 par value	11/03/2025		M		76.614	A	$0(2)	6,463	D
Class A Common Stock, $0.001 par value	11/03/2025		F		252.614(3)	D	$84.79	6,210	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units (RSU)	(1)	11/03/2025		A		20,049		(4)	(4)	Class A Common Stock, $0.001 par value	20,049	$0	20,049	D
Restricted Stock Units (RSU)	(1)	11/03/2025		M			959	(5)	(5)	Class A Common Stock, $0.001 par value	959	$0	1,918	D
Dividend Equivalent Units	(2)	11/03/2025		M			76.614	(2)	(2)	Class A Common Stock, $0.001 par value	76.614	$0	798	D

Explanation of Responses:

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

2. 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.

3. Disposition of Class A Common Stock to the Issuer to cover tax withholding obligations arising from the vesting of RSUs and DEUs.

4. 20,049 RSUs were granted on November 3, 2025. 5,012 RSUs vest on each of November 3, 2026, November 3, 2027, and November 3, 2028, and 5,013 RSUs vest on November 3, 2029, 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.

5. 3,835 RSUs were granted on November 3, 2023. 958 RSUs vested on November 3, 2024 and 959 RSUs vested on November 3, 2025. 959 RSUs vest on each of November 3, 2026 and November 3, 2027, 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.

Remarks:

	/s/ Martina McIsaac	11/05/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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