A
Atkore Inc
ATKR · AI Grid & Power Equipment
$73.77
+0.19 (+0.26%)
As of Jul 15, 2026 close
Institutional Ownership — Q1 2026 (filed through May 21)
Institutional Holders
301
-7 vs Q4 2025
Shares Held
32.3M
+333K QoQ
% of Shares Out
42.3%
14.3M held with sole discretion
Value Held
$2.4B
at $73.77 · Jul 15, 2026 close
5%+ Owners
5
via 13G/13D
% of Shares Out counts only shares held with sole investment discretion. Where two managers share discretion, Form 13F requires each to report the full position, so summing every filer exceeds 100% of shares outstanding for widely-held names.
Holder Map
Block size ∝ position · color = QoQ changeWhale Activity — Q1 2026 Filings
Increased103
Decreased92
New position50
Closed57
Institutional Shares Held by Quarter
Holders
Sortable · search holders| Source | % of Shrs Out | Period | |||||
|---|---|---|---|---|---|---|---|
| Gates Capital Management, Inc. | 13F | 2,685,718 | -47,429 -1.7% | $158.2M | 8.0% | Mar 31, 2026 | |
| BlackRock, Inc. | 13F | 2,626,791 | +71,086 +2.8% | $154.7M | 7.8% | Mar 31, 2026 | |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 13F | 2,090,469 | +2,090,469 new | $123.1M | 6.2% | Mar 31, 2026 | |
| VANGUARD CAPITAL MANAGEMENT LLC | 13F | 1,515,110 | +1,515,110 new | $89.3M | 4.5% | Mar 31, 2026 | |
| AMERICAN CENTURY COMPANIES INC | 13F | 1,439,116 | +185,567 +14.8% | $84.8M | 4.3% | Mar 31, 2026 | |
| DIMENSIONAL FUND ADVISORS LP | 13F | 1,227,991 | +97,514 +8.6% | $72.3M | 3.6% | Mar 31, 2026 | |
| FIRST TRUST ADVISORS LP | 13F | 1,226,840 | -158,901 -11.5% | $72.3M | 3.6% | Mar 31, 2026 | |
| LSV ASSET MANAGEMENT | 13F | 1,051,861 | +91,411 +9.5% | $62.0M | 3.1% | Mar 31, 2026 | |
| Coliseum Capital Management, LLC | 13F | 947,070 | +137,765 +17.0% | $55.8M | 2.8% | Mar 31, 2026 | |
| GEODE CAPITAL MANAGEMENT, LLC | 13F | 854,731 | +52,517 +6.5% | $50.4M | 2.5% | Mar 31, 2026 | |
| STATE STREET CORP | 13F | 835,156 | +7,635 +0.9% | $49.2M | 2.5% | Mar 31, 2026 | |
| EARNEST PARTNERS LLC | 13F | 777,905 | -5,833 -0.7% | $45.8M | 2.3% | Mar 31, 2026 | |
| Hill City Capital, LP | 13F | 728,206 | +0 +0.0% | $42.9M | 2.2% | Mar 31, 2026 | |
| Harding Loevner LP | 13F | 704,862 | -27,891 -3.8% | $41.5M | 2.1% | Mar 31, 2026 | |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 13F | 698,134 | -6,534 -0.9% | $41.1M | 2.1% | Mar 31, 2026 | |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 13F | 532,992 | +181,705 +51.7% | $31.4M | 1.6% | Mar 31, 2026 | |
| BANK OF AMERICA CORP /DE/ | 13F | 462,278 | +42,593 +10.1% | $27.2M | 1.4% | Mar 31, 2026 | |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 13F | 417,644 | +6,673 +1.6% | $24.6M | 1.2% | Mar 31, 2026 | |
| GENDELL JEFFREY L | 13F | 400,214 | +13,013 +3.4% | $23.6M | 1.2% | Mar 31, 2026 | |
| VICTORY CAPITAL MANAGEMENT INC | 13F | 379,274 | -113,042 -23.0% | $22.3M | 1.1% | Mar 31, 2026 | |
| LONDON CO OF VIRGINIA | 13F | 377,623 | -34,106 -8.3% | $22.2M | 1.1% | Mar 31, 2026 | |
| Oslo Pensjonsforsikring AS | 13F | 377,000 | +377,000 new | $22.2M | 1.1% | Mar 31, 2026 | |
| TWO SIGMA INVESTMENTS, LP | 13F | 353,000 | +133,669 +60.9% | $20.8M | 1.0% | Mar 31, 2026 | |
| NEW YORK STATE COMMON RETIREMENT FUND | 13F | 343,515 | -2,313 -0.7% | $20.2M | 1.0% | Mar 31, 2026 | |
| JACOBS LEVY EQUITY MANAGEMENT, INC | 13F | 343,289 | +19,570 +6.0% | $20.2M | 1.0% | Mar 31, 2026 | |
| MORGAN STANLEY | 13F | 338,300 | -58,207 -14.7% | $19.9M | 1.0% | Mar 31, 2026 | |
| NORTHERN TRUST CORP | 13F | 321,363 | -42,286 -11.6% | $18.9M | 1.0% | Mar 31, 2026 | |
| CANYON CAPITAL ADVISORS LLC | 13F | 305,000 | +305,000 new | $18.0M | 0.9% | Mar 31, 2026 | |
| Swedbank AB | 13F | 296,206 | +0 +0.0% | $17.4M | 0.9% | Mar 31, 2026 | |
| GOLDMAN SACHS GROUP INC | 13F | 276,092 | -107,749 -28.1% | $16.3M | 0.8% | Mar 31, 2026 | |
| JPMORGAN CHASE & CO | 13F | 250,308 | -146,838 -37.0% | $14.6M | 0.7% | Mar 31, 2026 | |
| CANADA PENSION PLAN INVESTMENT BOARD | 13F | 247,162 | -81,938 -24.9% | $14.6M | 0.7% | Mar 31, 2026 | |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 13F | 244,183 | +12,572 +5.4% | $14.4M | 0.7% | Mar 31, 2026 | |
| Bank of New York Mellon Corp | 13F | 235,919 | +148 +0.1% | $13.9M | 0.7% | Mar 31, 2026 | |
| VANGUARD FIDUCIARY TRUST CO | 13F | 218,268 | +218,268 new | $12.9M | 0.6% | Mar 31, 2026 | |
| SEI INVESTMENTS CO | 13F | 208,454 | +2,536 +1.2% | $12.3M | 0.6% | Mar 31, 2026 | |
| Nuveen, LLC | 13F | 193,913 | +396 +0.2% | $11.4M | 0.6% | Mar 31, 2026 | |
| WELLS FARGO & COMPANY/MN | 13F | 178,047 | -23,541 -11.7% | $10.5M | 0.5% | Mar 31, 2026 | |
| DNB Asset Management AS | 13F | 166,582 | +20,398 +14.0% | $9.8M | 0.5% | Mar 31, 2026 | |
| FEDERATED HERMES, INC. | 13F | 159,628 | +5,087 +3.3% | $9.4M | 0.5% | Mar 31, 2026 | |
| BARCLAYS PLC | 13F | 158,793 | +96,928 +156.7% | $9.4M | 0.5% | Mar 31, 2026 | |
| DEUTSCHE BANK AG\ | 13F | 156,118 | +90,124 +136.6% | $9.2M | 0.5% | Mar 31, 2026 | |
| HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC | 13F | 153,486 | -2,238 -1.4% | $9.0M | 0.5% | Mar 31, 2026 | |
| Man Group plc | 13F | 150,330 | +89,306 +146.3% | $8.9M | 0.4% | Mar 31, 2026 | |
| Qube Research & Technologies Ltd | 13F | 147,045 | +61,875 +72.6% | $8.7M | 0.4% | Mar 31, 2026 | |
| Empowered Funds, LLC | 13F | 133,516 | +133,516 new | $7.9M | 0.4% | Mar 31, 2026 | |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 13F | 125,800 | +62,800 +99.7% | $7.4M | 0.4% | Mar 31, 2026 | |
| Allianz Asset Management GmbH | 13F | 121,937 | +85,499 +234.6% | $7.2M | 0.4% | Mar 31, 2026 | |
| PDT Partners, LLC | 13F | 116,168 | +112,468 +3039.7% | $6.8M | 0.3% | Mar 31, 2026 | |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 13F | 106,270 | +4,898 +4.8% | $6.3M | 0.3% | Mar 31, 2026 |
Page 1 of 7
Derivatives Institutional Owners
13F put/call positions · excluded from ownership totals| Type | Period | |||||
|---|---|---|---|---|---|---|
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Put | 68,000 | -20,300 -23.0% | $4.0M | Mar 31, 2026 | |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Call | 48,600 | -500 -1.0% | $2.9M | Mar 31, 2026 | |
| JANE STREET GROUP, LLC | Call | 35,500 | -7,400 -17.2% | $2.1M | Mar 31, 2026 | |
| Crawford Fund Management, LLC | Call | 33,000 | -22,800 -40.9% | $1.9M | Mar 31, 2026 | |
| CITADEL ADVISORS LLC | Call | 19,500 | +2,300 +13.4% | $1.1M | Mar 31, 2026 | |
| CITADEL ADVISORS LLC | Put | 17,300 | -31,900 -64.8% | $1.0M | Mar 31, 2026 | |
| JANE STREET GROUP, LLC | Put | 9,300 | -2,500 -21.2% | $547.9K | Mar 31, 2026 | |
| PEAK6 LLC | Call | 3,700 | +3,700 new | $218.0K | Mar 31, 2026 | |
| Walleye Capital LLC | Put | 500 | -2,300 -82.1% | $29.5K | Mar 31, 2026 |
Ownership Events — 13G / 13D
Event-driven, scanned dailyVanguard Capital Management crosses 5.0% Initial Schedule 13G · 1,773,377 shares reported | 13G | Apr 29, 2026 |
Vanguard Portfolio Management crosses 5.0% Initial Schedule 13G · 2,117,497 shares reported | 13G | Apr 28, 2026 |
First Trust Portfolios L.P. falls below 5% (from 5.0%) Schedule 13G/A · position exited | 13G/A | Oct 31, 2025 |
BlackRock, Inc. reports 7.3% Schedule 13G/A · amendment | 13G/A | Oct 17, 2025 |
Gates Capital Management, L.P. reports 7.8% (from 9.5%) Schedule 13G/A · amendment | 13G/A | Aug 14, 2025 |
The Vanguard Group reports 10.3% (from 10.0%) Schedule 13G/A · amendment | 13G/A | Aug 7, 2025 |
The Vanguard Group reports 10.0% Schedule 13G/A · amendment | 13G/A | Jul 29, 2025 |
Gates Capital Management, L.P. reports 9.5% (from 7.5%) Schedule 13G/A · amendment | 13G/A | May 15, 2025 |
First Trust Portfolios L.P. crosses 5.0% Initial Schedule 13G · 1,720,986 shares reported | 13G | Apr 23, 2025 |
Gates Capital Management, L.P. reports 7.5% (from 5.6%) Schedule 13G/A · amendment | 13G/A | Feb 14, 2025 |
Quarterly holdings from SEC Form 13F-HR structured data sets (filed within 45 days of quarter end); 5%+ ownership events from Schedule 13G/13D filings scanned daily via EDGAR. Each row links to the source filing. Est. Avg Cost is a rolling-average estimate — each quarter's added shares priced at that quarter's 13F value ÷ shares, split-adjusted, with history beginning 2024-Q2; positions with one quarter of history or a data-quality flag show “—”.