Gates Capital discloses 1.71M Atkore (ATKR) shares, a 5.1% ownership stake

Rhea-AI Filing Summary

Gates Capital Management and related entities report a significant ownership position in Atkore Inc. They collectively report beneficial ownership of 1,710,192 shares of Atkore common stock, representing 5.1% of the outstanding shares, with all voting and dispositive power held on a shared rather than sole basis. The shares are held by certain funds for which Gates Capital acts as investment manager, and related entities Gates Capital Management GP, LLC and Gates Capital Management, Inc., as well as Jeffrey L. Gates, are included as reporting persons. The ownership percentage is based on 33,767,266 Atkore shares outstanding as of May 1, 2026.

Key Figures

Beneficial ownership: 1,710,192 shares Percent of class: 5.1% Shares outstanding: 33,767,266 shares +2 more

5 metrics

Beneficial ownership 1,710,192 shares Shares of Atkore common stock reported as beneficially owned by the reporting persons

Percent of class 5.1% Percentage of Atkore common stock class represented by 1,710,192 shares

Shares outstanding 33,767,266 shares Atkore common shares issued and outstanding as of May 1, 2026

Shared voting power 1,710,192 shares Shares over which the reporting persons have shared power to vote or direct the vote

Shared dispositive power 1,710,192 shares Shares over which the reporting persons have shared power to dispose or direct disposition

Key Terms

beneficial owner, shared voting power, shared dispositive power, Schedule 13G, +1 more

5 terms

beneficial owner regulatory

"The filing of this statement should not be construed as an admission that any of the Reporting Persons is, for purposes of Section 13 of the Act, the beneficial owner"

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

shared voting power regulatory

"Shared Voting Power 1,710,192.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

shared dispositive power regulatory

"Shared Dispositive Power 1,710,192.00"

Schedule 13G regulatory

"JOINT FILING AGREEMENT PURSUANT TO RULE 13d-1(k) The undersigned acknowledge and agree that the foregoing statement on /A is filed"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

joint filing agreement regulatory

"EXHIBIT 1 JOINT FILING AGREEMENT PURSUANT TO RULE 13d-1(k)"

FAQ

What ownership stake in Atkore Inc. (ATKR) does Gates Capital report?

Gates Capital and related reporting persons report beneficial ownership of 1,710,192 shares of Atkore Inc. common stock, representing 5.1% of the company’s outstanding shares based on 33,767,266 shares outstanding as of May 1, 2026.

Who are the reporting persons in the Atkore Inc. (ATKR) Schedule 13G/A?

The reporting persons are Gates Capital Management, L.P., Gates Capital Management GP, LLC, Gates Capital Management, Inc., and Jeffrey L. Gates, acting with respect to shares held by certain Gates Capital-managed funds.

What level of voting power does Gates Capital have over Atkore Inc. (ATKR) shares?

The reporting persons have 0 shares with sole voting power and 1,710,192 shares with shared voting power, matching their reported beneficial ownership and indicating decisions are made jointly for these shares.

How is the 5.1% ownership in Atkore Inc. (ATKR) calculated?

The 5.1% ownership figure is calculated using 33,767,266 Atkore common shares outstanding as of May 1, 2026, as disclosed in the company’s quarterly report referenced by the reporting persons.

Does Jeffrey L. Gates directly own Atkore Inc. (ATKR) shares?

Jeffrey L. Gates is included as a reporting person with respect to shares held by the Gates Capital funds. The statement notes it should not be construed as an admission that any reporting person is the beneficial owner for all purposes.

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

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Available on EDGAR 08/14/2026 - 04:06 PM Accepted by SEC EDGAR 08/14/2026 - 04:01 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 5)

Atkore Inc.

(Name of Issuer)

Common Stock, $.01 par value per share

(Title of Class of Securities)

047649108

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 047649108

1

Names of Reporting Persons

Gates Capital Management, L.P.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,710,192.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,710,192.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,710,192.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.1 %

12

Type of Reporting Person (See Instructions)

IA, PN

SCHEDULE 13G

CUSIP Number(s): 047649108

1

Names of Reporting Persons

Gates Capital Management GP, LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,710,192.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,710,192.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,710,192.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.1 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

CUSIP Number(s): 047649108

1

Names of Reporting Persons

Gates Capital Management, Inc.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,710,192.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,710,192.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,710,192.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.1 %

12

Type of Reporting Person (See Instructions)

IA, CO

SCHEDULE 13G

CUSIP Number(s): 047649108

1

Names of Reporting Persons

Jeffrey L. Gates

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,710,192.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,710,192.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,710,192.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.1 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Atkore Inc.
(b)	Address of issuer's principal executive offices: 16100 South Lathrop Avenue, Harvey, Illinois, 60426
Item 2.
(a)	Name of person filing: This Statement is filed by each of the entities and persons listed below, all of whom together are referred to herein as the "Reporting Persons": (i) Gates Capital Management, L.P., a Delaware limited partnership ("Gates Capital"), with respect to the shares of Common Stock held by certain funds as to which Gates Capital serves as investment manager (the "Gates Capital Funds"); (ii) Gates Capital Management GP, LLC, a Delaware limited liability company ("the General Partner"), which is the general partner of Gates Capital, with respect to the shares of Common Stock directly held by the Gates Capital Funds; (iii) Gates Capital Management, Inc., a Delaware corporation ("the Corporation"), is the managing member of the General Partner, with respect to the shares of Common Stock directly held by the Gates Capital Funds; and (iv) Jeffrey L. Gates, a United States citizen, who serves as the President of the Corporation, with respect to the shares of Common Stock directly held by the Gates Capital Funds.
(b)	Address or principal business office or, if none, residence: The address of the principal business office of each of the Reporting Persons is c/o Gates Capital Management, L.P., 1177 Avenue of the Americas, 46th Floor, New York, New York 10036.
(c)	Citizenship: (i) Gates Capital - a Delaware limited partnership (ii) The General Partner - a Delaware limited liability company (iii) The Corporation - a Delaware corporation (iv) Jeffrey L. Gates - a United States citizen The filing of this statement should not be construed as an admission that any of the Reporting Persons is, for purposes of Section 13 of the Act, the beneficial owner of the Common Stock reported herein.
(d)	Title of class of securities: Common Stock, $.01 par value per share
(e)	CUSIP No.: 047649108
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 1,710,192
(b)	Percent of class: 5.1%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 1,710,192
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 1,710,192 The percentage set forth this SCHEDULE 13G/A is calculated based upon the 33,767,266 shares of Common Stock issued and outstanding as of May 1, 2026, as disclosed in the Company's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on May 6, 2026. The information required by Items 4(a) - (c) is set forth in Rows 5 - 11 of the cover page for each Reporting Person hereto and is incorporated herein by reference for each Reporting Person.
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Gates Capital Management, L.P.

Signature:	/s/ Jeffrey L. Gates
Name/Title:	Jeffrey L. Gates- President
Date:	08/14/2026

Gates Capital Management GP, LLC

Signature:	/s/ Jeffrey L. Gates
Name/Title:	Jeffrey L. Gates- President
Date:	08/14/2026

Gates Capital Management, Inc.

Signature:	/s/ Jeffrey L. Gates
Name/Title:	Jeffrey L. Gates- President
Date:	08/14/2026

Jeffrey L. Gates

Signature:	/s/ Jeffrey L. Gates
Name/Title:	Jeffrey L. Gates
Date:	08/14/2026

Exhibit Information

EXHIBIT 1 JOINT FILING AGREEMENT PURSUANT TO RULE 13d-1(k) The undersigned acknowledge and agree that the foregoing statement on SCHEDULE 13G/A is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on SCHEDULE 13G/A shall be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him or it contained herein and therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information is inaccurate. DATE: August 14, 2026 Gates Capital Management, L.P. By: Gates Capital Management GP, LLC, its general partner By: Gates Capital Management, Inc., its managing member By: /s/ Jeffrey L. Gates Name: Jeffrey L. Gates Title: President Gates Capital Management GP, LLC By: Gates Capital Management, Inc., its managing member By: /s/ Jeffrey L. Gates Name: Jeffrey L. Gates Title: President Gates Capital Management, Inc. By: /s/ Jeffrey L. Gates Name: Jeffrey L. Gates Title: President Jeffrey L. Gates By: /s/ Jeffrey L. Gates