353 institutions reported holding $1.92B of Atkore Inc (ATKR) in SEC 13F filings for 2026-03-31. Largest institutional holders: Gates Capital Management, Inc. ($158.2M), BlackRock, Inc. ($154.7M), VANGUARD PORTFOLIO MANAGEMENT LLC ($123.1M), VANGUARD CAPITAL MANAGEMENT LLC ($89.3M), AMERICAN CENTURY COMPANIES INC ($84.8M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | Gates Capital Management, Inc. | $158.2M | 2.7M | Trimmed |
| 2 | BlackRock, Inc. | $154.7M | 2.6M | Added |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | $123.1M | 2.1M | New |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | $89.3M | 1.5M | New |
| 5 | AMERICAN CENTURY COMPANIES INC | $84.8M | 1.4M | Added |
| 6 | DIMENSIONAL FUND ADVISORS LP | $72.3M | 1.2M | Added |
| 7 | FIRST TRUST ADVISORS LP | $72.3M | 1.2M | Trimmed |
| 8 | LSV ASSET MANAGEMENT | $62.0M | 1.1M | Added |
| 9 | Coliseum Capital Management, LLC | $55.8M | 947,070 | Added |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | $50.4M | 854,731 | Added |
| 11 | STATE STREET CORP | $49.2M | 835,156 | Added |
| 12 | EARNEST PARTNERS LLC | $45.8M | 777,905 | Trimmed |
| 13 | Hill City Capital, LP | $42.9M | 728,206 | Hold |
| 14 | HARDING LOEVNER LP | $41.5M | 704,862 | Trimmed |
| 15 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $41.1M | 698,134 | Trimmed |
| 16 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $31.4M | 532,992 | Added |
| 17 | BANK OF AMERICA CORP /DE/ | $27.2M | 462,278 | Added |
| 18 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $24.6M | 417,644 | Added |
| 19 | GENDELL JEFFREY L | $23.6M | 400,214 | Added |
| 20 | VICTORY CAPITAL MANAGEMENT INC | $22.3M | 379,274 | Trimmed |
| 21 | LONDON CO OF VIRGINIA | $22.2M | 377,623 | Trimmed |
| 22 | Oslo Pensjonsforsikring AS | $22.2M | 377,000 | New |
| 23 | TWO SIGMA INVESTMENTS, LP | $20.8M | 353,000 | Added |
| 24 | NEW YORK STATE COMMON RETIREMENT FUND | $20.2M | 343,515 | Trimmed |
| 25 | JACOBS LEVY EQUITY MANAGEMENT, INC | $20.2M | 343,289 | Added |
Source: SEC Form 13F filings · as of 2026-03-31