MSC Industrial CEO acquires 1,173 shares as grants vest

Q: How many shares did MSM CEO Martina McIsaac acquire and deliver for tax withholding?

On October 3, 2026, Martina McIsaac acquired 1,173 Class A shares as RSUs vested and 187.737 Class A shares as dividend equivalent units vested; she delivered 480.737 shares to the issuer for tax withholding at $130.12 per share.

Q: When did Martina McIsaac's MSM RSUs vest?

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

The share delivery covered tax withholding obligations arising from vesting; the report lists 1,477 dividend equivalent units following the transactions.

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Rhea-AI Filing Summary

MSC Industrial Direct Co. Inc. President & CEO Martina McIsaac acquired 1,173 Class A shares when RSUs vested and 187.737 Class A shares when dividend equivalent units vested on October 3, 2026. She delivered 480.737 shares to the issuer for tax withholding, at a reported price of $130.12 per share. The report lists 0 RSUs and 1,477 dividend equivalent units following the transactions.

Insider Trade Summary

1,360.737 shares exercised/converted

Exercise 5 txns

Insider McIsaac Martina

Role President & CEO

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units (RSU) ^{F1, F4}	1,173	$0.00	$0.00
Exercise	Dividend Equivalent Units ^{F2, F5}	187.737	$0.00	$0.00
Exercise	Class A Common Stock, $0.001 par value ^F1	1,173	$0.00	$0.00
Exercise	Class A Common Stock, $0.001 par value ^F2	187.737	$0.00	$0.00
Tax Withholding	Class A Common Stock, $0.001 par value ^F3	480.737	$130.12	$63K

Holdings After Transaction: Restricted Stock Units (RSU) — 0 contracts (Direct); Dividend Equivalent Units — 1,477 contracts (Direct); Class A Common Stock, $0.001 par value — 9,151 shares (Direct)

Footnotes (5)

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, October 3, 2025, and October 3, 2026.
F5. 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.

Key Figures

RSUs vested: 1,173 shares Dividend-equivalent-unit shares acquired: 187.737 shares Shares delivered for tax withholding: 480.737 shares +3 more

6 metrics

RSUs vested 1,173 shares October 3, 2026

Dividend-equivalent-unit shares acquired 187.737 shares October 3, 2026

Shares delivered for tax withholding 480.737 shares October 3, 2026

Reported price per share $130.12 per share Tax-withholding disposition on October 3, 2026

RSUs following transaction 0 RSUs As reported for October 3, 2026

Dividend equivalent units following transaction 1,477 units As reported for October 3, 2026

Key Terms

Restricted Stock Units (RSU), Dividend Equivalent Units, contingent right

3 terms

Restricted Stock Units (RSU) financial

"Each RSU represents a contingent right to receive one share"

Dividend Equivalent Units financial

"The dividend equivalent units accrued with respect to outstanding awards"

Dividend equivalent units are bookkeeping credits that mirror cash dividends paid on actual shares, granted to holders of stock-based awards such as restricted stock units or deferred compensation. They matter to investors because they increase a company’s reported employee compensation cost and can lead to issuance of more shares or cash payouts over time, similar to extra pay linked to ownership that affects shareholder dilution and corporate cash flow.

contingent right technical

"represents a contingent right to receive one share"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many shares did MSM CEO Martina McIsaac acquire and deliver for tax withholding?

On October 3, 2026, Martina McIsaac acquired 1,173 Class A shares as RSUs vested and 187.737 Class A shares as dividend equivalent units vested; she delivered 480.737 shares to the issuer for tax withholding at $130.12 per share.

When did Martina McIsaac's MSM RSUs vest?

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

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/06/2026 - 03:07 PM Accepted by SEC EDGAR 10/06/2026 - 03:07 PM

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

NEW YORK

11747

(City)

(State)

(Zip)

UNITED STATES

(Country)

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 & CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/03/2026

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

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

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

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Class A Common Stock, $0.001 par value	10/03/2026		M		1,173	A	$0⁽¹⁾	9,444	D
Class A Common Stock, $0.001 par value	10/03/2026		M		187.737	A	$0⁽²⁾	9,632	D
Class A Common Stock, $0.001 par value	10/03/2026		F		480.737⁽³⁾	D	$130.12	9,151	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Stock Units (RSU)	⁽¹⁾	10/03/2026		M			1,173	⁽⁴⁾	⁽⁴⁾	Class A Common Stock, $0.001 par value	1,173	$0	0	D
Dividend Equivalent Units	⁽²⁾	10/03/2026		M			187.737	⁽²⁾	⁽²⁾	Class A Common Stock, $0.001 par value	187.737	$0	1,477⁽⁵⁾	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. 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.

5. 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.

Remarks:

	/s/ Martina McIsaac	10/06/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR