As of November 6, 2026, 5 holders' latest Schedule 13D or 13G filings report owning 5% or more of Atkore Inc. The largest reported stake is BlackRock, Inc.'s, at 7.3%. 11 filings are on record since July 29, 2025 (Schedule 13G/A, October 17, 2025).
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Key facts
- · Reporting person: Vanguard Portfolio Management · Sole voting: 14,196 · Shared voting: 0 · Sole dispositive: 1,689,761 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-10-30
- · Reporting person: American Century ETF Trust · Sole voting: 1,696,217 · Shared voting: 0 · Sole dispositive: 1,696,217 · Shared dispositive: 0 · SCHEDULE 13G, 2026-08-14
- · Reporting person: Gates Capital Management, L.P. · Sole voting: 0 · Shared voting: 1,710,192 · Sole dispositive: 0 · Shared dispositive: 1,710,192 · SCHEDULE 13G/A, 2026-08-14
- · Reporting person: Vanguard Capital Management · Sole voting: 258,267 · Shared voting: 0 · Sole dispositive: 1,773,377 · Shared dispositive: 0 · SCHEDULE 13G, 2026-04-29
- · Holder: Vanguard Portfolio Management · Percent: 6.27% · SCHEDULE 13G
Atkore Inc has 11 Schedule 13D or 13G filings on record since 2025-07-29. 5 holders' latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Layoffs on record: 1 filing or notice, latest 2025-10-03 (layoff filings and notices).
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| BlackRock, Inc. | 7.3% | 2,462,609 | SCHEDULE 13G/A, 2025-10-17 | 2025-09-30 |
| American Century Investment Management, Inc. | 5.3% | 1,775,158 | SCHEDULE 13G, 2026-08-14 | 2026-06-30 |
| Vanguard Capital Management | 5.25% | 1,773,377 | SCHEDULE 13G, 2026-04-29 | 2026-03-31 |
| Gates Capital Management, L.P. | 5.1% | 1,710,192 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| Vanguard Portfolio Management | 5% | 1,689,761 | SCHEDULE 13G/A, 2026-10-30 | 2026-09-30 |
| First Trust Portfolios L.P. | 3.88% | 1,306,574 | SCHEDULE 13G/A, 2025-10-31 | 2025-09-30 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-26 | 2026-03-13 |
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More on Atkore Inc and the records around it.
Atkore Inc elsewhere on the record
- Acquisition Oct 2026
- Layoff notices Oct 2025
- Who owns it
Companies that share a holder
- Gates Capital Management, L.P. also filed stake reports on 6 other companies: MasterBrand, Inc. (Aug 2026), Acuren Corporation (Aug 2026), Neogen Corporation (Feb 2026)
- American Century ETF Trust also filed stake reports on 83 other companies: Visteon Corporation (Oct 2026), MarineMax, Inc. (Sep 2026), AdvanSix Inc. (Aug 2026)
- First Trust Portfolios L.P. also filed stake reports on 105 other companies: First Trust Exchange-Traded Fund (Nov 2026), First Trust Exchange-Traded Fund IV (Nov 2026), First Trust Exchange-Traded Fund VIII (Nov 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| American Century ETF Trust | 1,696,217 | 0 | 1,696,217 | 0 | SCHEDULE 13G, 2026-08-14 |
| American Century Investment Management, Inc. | 1,775,158 | 0 | 1,775,158 | 0 | SCHEDULE 13G, 2026-08-14 |
| American Century Companies, Inc. | 1,775,158 | 0 | 1,775,158 | 0 | SCHEDULE 13G, 2026-08-14 |
| Stowers Institute for Medical Research | 1,775,158 | 0 | 1,775,158 | 0 | SCHEDULE 13G, 2026-08-14 |
| Vanguard Capital Management | 258,267 | 0 | 1,773,377 | 0 | SCHEDULE 13G, 2026-04-29 |
| Gates Capital Management, L.P. | 0 | 1,710,192 | 0 | 1,710,192 | SCHEDULE 13G/A, 2026-08-14 |
| Gates Capital Management GP, LLC | 0 | 1,710,192 | 0 | 1,710,192 | SCHEDULE 13G/A, 2026-08-14 |
| Gates Capital Management, Inc. | 0 | 1,710,192 | 0 | 1,710,192 | SCHEDULE 13G/A, 2026-08-14 |
| Jeffrey L. Gates | 0 | 1,710,192 | 0 | 1,710,192 | SCHEDULE 13G/A, 2026-08-14 |
| Vanguard Portfolio Management | 14,196 | 0 | 1,689,761 | 0 | SCHEDULE 13G/A, 2026-10-30 |
The latest filing identifies Atkore Inc by CUSIP 047649108 and gives its principal executive office as 16100 South Lathrop Avenue, Harvey, IL 60426 (SCHEDULE 13G/A, 2026-10-30).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-29 | The Vanguard Group | 9.98% | SCHEDULE 13G/A |
| 2025-08-07 | The Vanguard Group | 10.33% | SCHEDULE 13G/A |
| 2025-08-14 | Gates Capital Management, L.P. | 7.8% | SCHEDULE 13G/A |
| 2025-10-17 | BlackRock, Inc. | 7.3% | SCHEDULE 13G/A |
| 2025-10-31 | First Trust Portfolios L.P. | 3.88% | SCHEDULE 13G/A |
| 2026-03-26 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-28 | Vanguard Portfolio Management | 6.27% | SCHEDULE 13G |
| 2026-04-29 | Vanguard Capital Management | 5.25% | SCHEDULE 13G |
| 2026-08-14 | American Century Investment Management, Inc. | 5.3% | SCHEDULE 13G |
| 2026-08-14 | Gates Capital Management, L.P. | 5.1% | SCHEDULE 13G/A |
| 2026-10-30 | Vanguard Portfolio Management | 5% | SCHEDULE 13G/A |
Questions about who owns Atkore Inc
Who owns Atkore Inc?
On this page, 5 holders' latest ownership filings report 5% or more of Atkore Inc: BlackRock, Inc. (7.3%, Schedule 13G/A, filed 2025-10-17), American Century Investment Management, Inc. (5.3%, Schedule 13G, filed 2026-08-14), Vanguard Capital Management (5.25%, Schedule 13G, filed 2026-04-29), Gates Capital Management, L.P. (5.1%, Schedule 13G/A, filed 2026-08-14) and Vanguard Portfolio Management (5%, Schedule 13G/A, filed 2026-10-30).
Who are the largest shareholders of Atkore Inc?
By the share each holder's latest filing reports, the largest holders of Atkore Inc on this page are BlackRock, Inc. (7.3%), American Century Investment Management, Inc. (5.3%) and Vanguard Capital Management (5.25%).
When did BlackRock, Inc. buy into Atkore Inc?
The filings give report dates, not purchase dates. The earliest filing from BlackRock, Inc. on this page is the Schedule 13G/A, filed 2025-10-17, reporting 7.3%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 11 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
Also on the record for Atkore Inc
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| October 19, 2026 | Acquired by Prysmian S.p.A | — | Acquisition | Source |
| October 19, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.