DIMETRICS
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 change
Whale 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 LLC13F
2,090,469
+2,090,469
new
$123.1M
6.2%
Mar 31, 2026
VANGUARD CAPITAL MANAGEMENT LLC13F
1,515,110
+1,515,110
new
$89.3M
4.5%
Mar 31, 2026
AMERICAN CENTURY COMPANIES INC13F
1,439,116
+185,567
+14.8%
$84.8M
4.3%
Mar 31, 2026
DIMENSIONAL FUND ADVISORS LP13F
1,227,991
+97,514
+8.6%
$72.3M
3.6%
Mar 31, 2026
FIRST TRUST ADVISORS LP13F
1,226,840
-158,901
-11.5%
$72.3M
3.6%
Mar 31, 2026
LSV ASSET MANAGEMENT13F
1,051,861
+91,411
+9.5%
$62.0M
3.1%
Mar 31, 2026
Coliseum Capital Management, LLC13F
947,070
+137,765
+17.0%
$55.8M
2.8%
Mar 31, 2026
GEODE CAPITAL MANAGEMENT, LLC13F
854,731
+52,517
+6.5%
$50.4M
2.5%
Mar 31, 2026
STATE STREET CORP13F
835,156
+7,635
+0.9%
$49.2M
2.5%
Mar 31, 2026
EARNEST PARTNERS LLC13F
777,905
-5,833
-0.7%
$45.8M
2.3%
Mar 31, 2026
Hill City Capital, LP13F
728,206
+0
+0.0%
$42.9M
2.2%
Mar 31, 2026
Harding Loevner LP13F
704,862
-27,891
-3.8%
$41.5M
2.1%
Mar 31, 2026
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP13F
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 INC13F
417,644
+6,673
+1.6%
$24.6M
1.2%
Mar 31, 2026
GENDELL JEFFREY L13F
400,214
+13,013
+3.4%
$23.6M
1.2%
Mar 31, 2026
VICTORY CAPITAL MANAGEMENT INC13F
379,274
-113,042
-23.0%
$22.3M
1.1%
Mar 31, 2026
LONDON CO OF VIRGINIA13F
377,623
-34,106
-8.3%
$22.2M
1.1%
Mar 31, 2026
Oslo Pensjonsforsikring AS13F
377,000
+377,000
new
$22.2M
1.1%
Mar 31, 2026
TWO SIGMA INVESTMENTS, LP13F
353,000
+133,669
+60.9%
$20.8M
1.0%
Mar 31, 2026
NEW YORK STATE COMMON RETIREMENT FUND13F
343,515
-2,313
-0.7%
$20.2M
1.0%
Mar 31, 2026
JACOBS LEVY EQUITY MANAGEMENT, INC13F
343,289
+19,570
+6.0%
$20.2M
1.0%
Mar 31, 2026
MORGAN STANLEY13F
338,300
-58,207
-14.7%
$19.9M
1.0%
Mar 31, 2026
NORTHERN TRUST CORP13F
321,363
-42,286
-11.6%
$18.9M
1.0%
Mar 31, 2026
CANYON CAPITAL ADVISORS LLC13F
305,000
+305,000
new
$18.0M
0.9%
Mar 31, 2026
Swedbank AB13F
296,206
+0
+0.0%
$17.4M
0.9%
Mar 31, 2026
GOLDMAN SACHS GROUP INC13F
276,092
-107,749
-28.1%
$16.3M
0.8%
Mar 31, 2026
JPMORGAN CHASE & CO13F
250,308
-146,838
-37.0%
$14.6M
0.7%
Mar 31, 2026
CANADA PENSION PLAN INVESTMENT BOARD13F
247,162
-81,938
-24.9%
$14.6M
0.7%
Mar 31, 2026
BRIDGEWAY CAPITAL MANAGEMENT, LLC13F
244,183
+12,572
+5.4%
$14.4M
0.7%
Mar 31, 2026
Bank of New York Mellon Corp13F
235,919
+148
+0.1%
$13.9M
0.7%
Mar 31, 2026
VANGUARD FIDUCIARY TRUST CO13F
218,268
+218,268
new
$12.9M
0.6%
Mar 31, 2026
SEI INVESTMENTS CO13F
208,454
+2,536
+1.2%
$12.3M
0.6%
Mar 31, 2026
Nuveen, LLC13F
193,913
+396
+0.2%
$11.4M
0.6%
Mar 31, 2026
WELLS FARGO & COMPANY/MN13F
178,047
-23,541
-11.7%
$10.5M
0.5%
Mar 31, 2026
DNB Asset Management AS13F
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 PLC13F
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 LLC13F
153,486
-2,238
-1.4%
$9.0M
0.5%
Mar 31, 2026
Man Group plc13F
150,330
+89,306
+146.3%
$8.9M
0.4%
Mar 31, 2026
Qube Research & Technologies Ltd13F
147,045
+61,875
+72.6%
$8.7M
0.4%
Mar 31, 2026
Empowered Funds, LLC13F
133,516
+133,516
new
$7.9M
0.4%
Mar 31, 2026
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND13F
125,800
+62,800
+99.7%
$7.4M
0.4%
Mar 31, 2026
Allianz Asset Management GmbH13F
121,937
+85,499
+234.6%
$7.2M
0.4%
Mar 31, 2026
PDT Partners, LLC13F
116,168
+112,468
+3039.7%
$6.8M
0.3%
Mar 31, 2026
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC13F
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, LLPPut
68,000
-20,300
-23.0%
$4.0M
Mar 31, 2026
SUSQUEHANNA INTERNATIONAL GROUP, LLPCall
48,600
-500
-1.0%
$2.9M
Mar 31, 2026
JANE STREET GROUP, LLCCall
35,500
-7,400
-17.2%
$2.1M
Mar 31, 2026
Crawford Fund Management, LLCCall
33,000
-22,800
-40.9%
$1.9M
Mar 31, 2026
CITADEL ADVISORS LLCCall
19,500
+2,300
+13.4%
$1.1M
Mar 31, 2026
CITADEL ADVISORS LLCPut
17,300
-31,900
-64.8%
$1.0M
Mar 31, 2026
JANE STREET GROUP, LLCPut
9,300
-2,500
-21.2%
$547.9K
Mar 31, 2026
PEAK6 LLCCall
3,700
+3,700
new
$218.0K
Mar 31, 2026
Walleye Capital LLCPut
500
-2,300
-82.1%
$29.5K
Mar 31, 2026
Ownership Events — 13G / 13D
Event-driven, scanned daily
Vanguard Capital Management crosses 5.0%
Initial Schedule 13G · 1,773,377 shares reported
13GApr 29, 2026
Vanguard Portfolio Management crosses 5.0%
Initial Schedule 13G · 2,117,497 shares reported
13GApr 28, 2026
First Trust Portfolios L.P. falls below 5% (from 5.0%)
Schedule 13G/A · position exited
13G/AOct 31, 2025
BlackRock, Inc. reports 7.3%
Schedule 13G/A · amendment
13G/AOct 17, 2025
Gates Capital Management, L.P. reports 7.8% (from 9.5%)
Schedule 13G/A · amendment
13G/AAug 14, 2025
The Vanguard Group reports 10.3% (from 10.0%)
Schedule 13G/A · amendment
13G/AAug 7, 2025
The Vanguard Group reports 10.0%
Schedule 13G/A · amendment
13G/AJul 29, 2025
Gates Capital Management, L.P. reports 9.5% (from 7.5%)
Schedule 13G/A · amendment
13G/AMay 15, 2025
First Trust Portfolios L.P. crosses 5.0%
Initial Schedule 13G · 1,720,986 shares reported
13GApr 23, 2025
Gates Capital Management, L.P. reports 7.5% (from 5.6%)
Schedule 13G/A · amendment
13G/AFeb 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 “—”.