Form 4: ATKR exec RSU tax withholding; 31,527.126 shares owned

Rhea-AI Filing Summary

Atkore Inc. (ATKR) insider activity: Officer Mark F. Lamps reported a tax withholding related to vested RSUs on 11/11/2025. The filing shows 397 shares were withheld under code F at $65.11 per share to cover taxes.

Following this administrative transaction, Lamps beneficially owns 31,527.126 shares. The ownership figure includes unvested restricted stock units and accrued dividend equivalent units on those RSUs.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Lamps Mark F.

Role Pres. Safety & Infrastructure

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	397	$65.11	$26K

Holdings After Transaction: Common Stock — 31,527.126 shares (Direct)

Footnotes (1)

1. Securities withheld to pay withholding taxes on vested restricted stock units exempt under Rule 16b-3. Includes unvested restricted stock units ("RSUs") and amounts accrued for dividend equivalent units on such RSUs.

Form 4 Insider Transactions: What Each Field Means →

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^*

Lamps Mark F.

(Last) (First) (Middle)

16100 S. LATHROP AVENUE

(Street)

HARVEY IL 60426

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Atkore Inc. [ ATKR ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Pres. Safety & Infrastructure

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

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
Common Stock	11/11/2025		F		397(1)	D	$65.11	31,527.126(2)	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

Explanation of Responses:

1. Securities withheld to pay withholding taxes on vested restricted stock units exempt under Rule 16b-3.

2. Includes unvested restricted stock units ("RSUs") and amounts accrued for dividend equivalent units on such RSUs.

Remarks:

	/s/ Daniel S. Kelly, Attorney-in-Fact for Mark F. Lamps	11/13/2025
	** 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.

FAQ

What did Atkore (ATKR) report in this Form 4?

An officer, Mark F. Lamps, reported a tax withholding on vested RSUs, coded F, on 11/11/2025.

How many ATKR shares were withheld and at what price?

397 shares were withheld at $65.11 per share to satisfy taxes.

How many ATKR shares does the reporting person own after the transaction?

He beneficially owns 31,527.126 shares after the transaction.

What does transaction code F mean?

Code F indicates shares withheld to pay taxes upon vesting of equity awards.

Does the ownership total include unvested awards?

Yes. It includes unvested RSUs and amounts accrued for dividend equivalent units on those RSUs.

What is the reporting person’s role at Atkore?

Officer: President, Safety & Infrastructure.