Atkore (ATKR) officer Mark F. Lamps sells 300 shares in Rule 10b5-1 trade

Rhea-AI Filing Summary

Atkore Inc. executive Mark F. Lamps, President of Safety & Infrastructure, reported a sale of 300 shares of Atkore common stock on August 10, 2026 at a price of $93.75 per share, in an open-market or private transaction. The transaction was executed pursuant to a Rule 10b5-1 trading plan adopted on May 11, 2026. Following this sale, Lamps held 35,802.5375 shares directly, a figure that includes unvested restricted stock units and accrued dividend equivalent units on those RSUs.

Insider Trade Summary

Net Seller: 300 shares

Net Sell 1 txn

Insider Lamps Mark F.

Role Pres. Safety & Infrastructure

Sold 300 shs ($28K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	300	$93.75	$28K

Holdings After Transaction: Common Stock — 35,802.5375 shares (Direct)

Footnotes (2)

1. F1. The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 11, 2026.
2. F2. Includes unvested restricted stock units ("RSUs") and amounts accrued for dividend equivalent units on such RSUs.

Key Figures

Shares sold: 300 shares Sale price: $93.75 per share Post-transaction holdings: 35,802.5375 shares +1 more

4 metrics

Shares sold 300 shares Common stock sold on August 10, 2026 by Mark F. Lamps

Sale price $93.75 per share Price for the 300-share sale of Atkore common stock

Post-transaction holdings 35,802.5375 shares Direct holdings of Mark F. Lamps after the sale, including unvested RSUs and dividend equivalents

10b5-1 plan adoption date May 11, 2026 Date Mark F. Lamps adopted the Rule 10b5-1 trading plan used for this sale

Key Terms

Rule 10b5-1 trading plan, restricted stock units ("RSUs"), dividend equivalent units

3 terms

Rule 10b5-1 trading plan regulatory

"The sale was effected pursuant to a Rule 10b5-1 trading plan adopted"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

restricted stock units ("RSUs") financial

"Includes unvested restricted stock units ("RSUs") and amounts accrued"

Restricted stock units (RSUs) are a company promise to give an employee shares of stock (or cash equivalent) in the future, but only after certain conditions—usually staying with the company for a set time or hitting performance goals—are met. Investors watch RSUs because when they vest they increase the number of shares outstanding and can lead insiders to sell shares, affecting share price, company dilution and the true cost of employee pay.

dividend equivalent units financial

"and amounts accrued for dividend equivalent units on such RSUs"

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.

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/10/2026 - 05:07 PM Accepted by SEC EDGAR 08/10/2026 - 05:06 PM Learn about SEC filing dates

FAQ

What insider transaction did Atkore (ATKR) report for Mark F. Lamps?

Atkore reported that Mark F. Lamps sold 300 shares of common stock on August 10, 2026 at $93.75 per share, in an open-market or private transaction under a pre-arranged Rule 10b5-1 trading plan.

How many Atkore (ATKR) shares does Mark F. Lamps hold after this sale?

After the reported sale, Mark F. Lamps directly holds 35,802.5375 shares of Atkore common stock. This total includes unvested RSUs and dividend equivalent units accrued on those RSUs, as disclosed in the filing footnotes.

Was the Atkore (ATKR) insider sale by Mark F. Lamps under a Rule 10b5-1 plan?

Yes. The filing states the sale was effected under a Rule 10b5-1 trading plan adopted by Mark F. Lamps on May 11, 2026, indicating the trade was pre-arranged rather than decided at the time of execution.

What price did Mark F. Lamps receive for his Atkore (ATKR) share sale?

Mark F. Lamps sold 300 shares of Atkore common stock at a price of $93.75 per share. The transaction is described as a sale in an open market or private transaction with that stated per-share price.

What role does Mark F. Lamps hold at Atkore (ATKR)?

Mark F. Lamps is identified as an officer of Atkore with the title President, Safety & Infrastructure. His reported holdings of 35,802.5375 shares after the transaction reflect his direct ownership position, including equity awards.

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 ILLINOIS 60426

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/10/2026

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/10/2026		S(1)		300	D	$93.75	35,802.5375(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. The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 11, 2026.

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	08/10/2026
	** 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)