ATKR · Atkore Inc. · Shareholders & Ownership
Market Cap
$3.21B
Shares
33.77M
Volume · Oct 16
1.3M
Avg daily vol (3M)
935.29K
Every disclosed holder of ATKR in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.
Who Owns ATKR
13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positionsNo chart: the summed disclosures exceed shares outstanding, so they are not parts of one whole.
| Holder group | Shares | % Out |
|---|---|---|
| Institutional (13F) | 32,460,528 | 96.12% |
| Insiders (Forms 3, 4, 5) | 525,908 | 1.56% |
| 13D/G-only blocks | 1,306,574 | 3.87% |
| Remaining | 520,460 | -1.54% |
| Registered funds (N-PORT, not summed) | 12,904,693 | 38.21% |
Shares outstanding: 33,772,550, the issuer's latest cover-page count restated onto today's split basis.
Remaining is negative: the summed disclosures exceed shares outstanding, as when filings are dated at different times or holders that do not disclose their links count the same shares. It is flagged, not clipped.
13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.
Holders of ATKR
| # | Holder | Shares | As of | Notes |
|---|---|---|---|---|
| 1 |
BlackRock, Inc.
13F
CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,116,222 | ||
| 1.1 |
iShares Russell 2000 ETF
Fund
S000004344 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
894,183 | ||
| 1.2 |
iShares Russell 2000 Value ETF
Fund
S000004342 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
322,433 | ||
| 1.3 |
BlackRock Advantage Small Cap Core Fund
Fund
S000039982 · Registered fund · May 29, 2026
BlackRock Funds, not summed
|
81,254 | ||
| 1.4 |
Master Small Cap Index Series
Fund
S000002716 · Registered fund · Jun 30, 2026
Quantitative Master Series LLC, not summed
|
62,505 | ||
| 1.5 |
iShares Core S&P Total U.S. Stock Market ETF
Fund
S000004317 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
48,126 | ||
| 2 |
VANGUARD PORTFOLIO MANAGEMENT LLC
13F
CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,122,380 | ||
| 3 |
AMERICAN CENTURY COMPANIES INC
13F
CIK 748054 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,775,158 | ||
| 3.1 |
American Century Investment Management, Inc.
13G
CIK 52388 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
|
1,775,158 | ||
| 4 |
Gates Capital Management, Inc.
13F
CIK 1312908 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,710,192 | ||
| 4.1 |
Gates Capital Management, Inc.
13G
CIK 1312908 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
|
1,710,192 | ||
| 5 |
VANGUARD CAPITAL MANAGEMENT LLC
13F
CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,524,252 | ||
| 6 |
Avantis U.S. Small Cap Value ETF
Fund
S000066459 · Registered fund · May 31, 2026
American Century ETF Trust, not summed
|
1,383,751 | ||
| 7 |
First Trust Portfolios L.P.
13G
CIK 1184765 · Unknown · Sep 30, 2025
Rule 13d-1(b), qualified institution
|
1,306,574 | ||
| 8 |
DIMENSIONAL FUND ADVISORS LP
13F
CIK 354204 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,299,786 | ||
| 8.1 |
U.S. SMALL CAP VALUE PORTFOLIO
Fund
S000000987 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
|
251,407 | ||
| 8.2 |
Dimensional US Small Cap Value ETF
Fund
S000075151 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
|
156,558 | ||
| 8.3 |
U.S. SMALL CAP PORTFOLIO
Fund
S000000971 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
|
150,151 | ||
| 8.4 |
Dimensional U.S. Small Cap ETF
Fund
S000070906 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
|
107,657 | ||
| 8.5 |
U.S. MICRO CAP PORTFOLIO
Fund
S000000948 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
|
97,099 | ||
| 9 |
LSV ASSET MANAGEMENT
13F
CIK 1050470 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,093,590 | ||
| 10 |
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund
S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
1,074,550 | ||
| 11 |
|
906,421 | ||
| 11.1 |
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund
S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
|
12,000 | ||
| 11.2 |
State Street Total Return V.I.S. Fund
Fund
S000001637 · Registered fund · Jun 30, 2026
STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
|
865 | ||
| 11.3 |
State Street(R) SPDR(R) Portfolio MSCI Global Stock Market ETF
Fund
S000036082 · Registered fund · Jun 30, 2026
SPDR INDEX SHARES FUNDS, not summed
|
469 | ||
| 11.4 |
State Street Balanced Index Fund
Fund
S000082802 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
|
210 | ||
| 12 |
GEODE CAPITAL MANAGEMENT, LLC
13F
CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
902,486 | ||
| 13 |
VANGUARD SMALL-CAP INDEX FUND
Fund
S000002845 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
775,446 | ||
| 14 |
EARNEST PARTNERS LLC
13F
CIK 1102578 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
772,294 | ||
| 15 |
Hill City Capital, LP
13F
CIK 1837343 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
724,106 | ||
| 16 |
T. Rowe Price Investment Management, Inc.
13F
CIK 1897612 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
647,881 | ||
| 17 |
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.
13F
CIK 1705339 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
575,607 | ||
| 18 |
Harding Loevner LP
13F
CIK 928196 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
567,192 | ||
| 18.1 |
Harding Loevner Global Equity Portfolio
Fund
S000004200 · Registered fund · Jul 31, 2026
HARDING LOEVNER FUNDS INC, not summed
|
53,523 | ||
| 19 |
FIRST TRUST ADVISORS LP
13F
CIK 1125816 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
533,063 | ||
| 19.1 |
First Trust Active Factor Mid Cap ETF
Fund
S000066789 · Registered fund · May 31, 2026
First Trust Exchange-Traded Fund VIII, not summed
|
8,155 | ||
| 19.2 |
First Trust Active Factor Small Cap ETF
Fund
S000066790 · Registered fund · May 31, 2026
First Trust Exchange-Traded Fund VIII, not summed
|
3,209 | ||
| 20 |
JPMORGAN CHASE & CO
13F
CIK 19617 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
520,864 | ||
| 21 |
JACOBS LEVY EQUITY MANAGEMENT, INC
13F
CIK 884414 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
519,275 | ||
| 22 |
Irenic Capital Management LP
13F
CIK 1929389 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
507,613 | ||
| 23 |
VANGUARD SMALL-CAP VALUE INDEX FUND
Fund
S000002847 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
490,563 | ||
| 24 |
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP
13F
CIK 1164508 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
482,239 | ||
| 25 |
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F
CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
453,964 | ||
| 25.1 |
Schwab U.S. Small-Cap ETF
Fund
S000026636 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
|
162,043 | ||
| 25.2 |
Schwab Small-Cap Index Fund
Fund
S000005912 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
|
82,985 | ||
| 25.3 |
Schwab Fundamental U.S. Large Company ETF
Fund
S000040877 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
|
76,064 | ||
| 25.4 |
Schwab Small-Cap Equity Fund
Fund
S000005516 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
|
51,037 | ||
| 25.5 |
Schwab Fundamental U.S. Large Company Index Fund
Fund
S000016766 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
|
40,400 | ||
| 26 |
BANK OF AMERICA CORP /DE/
13F
CIK 70858 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
438,802 | ||
| 27 |
First Trust NASDAQ Clean Edge Smart Grid Infrastructure Index Fund
Fund
S000026919 · Registered fund · Jun 30, 2026
First Trust Exchange-Traded Fund II, not summed
|
403,414 | ||
| 28 |
TWO SIGMA INVESTMENTS, LP
13F
CIK 1179392 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
402,131 | ||
| 29 |
GENDELL JEFFREY L
13F
CIK 1056581 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
400,214 | ||
| 30 |
VANGUARD EXTENDED MARKET INDEX FUND
Fund
S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
387,811 | ||
| 31 |
LONDON CO OF VIRGINIA
13F
CIK 1259887 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
386,827 | ||
| 32 |
MORGAN STANLEY
13F
CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
378,566 | ||
| 32.1 |
E*TRADE No Fee Total Market Index Fund
Fund
S000090722 · Registered fund · Jul 31, 2026
E Trade Trust, not summed
|
52 | ||
| 33 |
VICTORY CAPITAL MANAGEMENT INC
13F
CIK 1040188 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
371,385 | ||
| 33.1 |
Victory Integrity Small-Cap Value Fund
Fund
S000046393 · Registered fund · Jun 30, 2026
Victory Portfolios, not summed
|
100,200 | ||
| 33.2 |
VictoryShares US Small Mid Cap Value Momentum ETF
Fund
S000065161 · Registered fund · Jun 30, 2026
Victory Portfolios II, not summed
|
66,976 | ||
| 33.3 |
Victory Small Cap Stock Fund
Fund
S000012914 · Registered fund · Jul 31, 2026
Victory Portfolios III, not summed
|
48,317 | ||
| 33.4 |
Victory Cornerstone Moderately Aggressive Fund
Fund
S000012926 · Registered fund · May 31, 2026
Victory Portfolios III, not summed
|
5,308 | ||
| 33.5 |
Victory Extended Market Index Fund
Fund
S000012941 · Registered fund · Jul 31, 2026
Victory Portfolios III, not summed
|
3,827 | ||
| 34 |
Boston Partners
13F
CIK 1386060 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
367,806 | ||
| 35 |
NEW YORK STATE COMMON RETIREMENT FUND
13F
CIK 810265 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
341,215 | ||
| 36 |
NORTHERN TRUST CORP
13F
CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
335,441 | ||
| 36.1 |
Small Cap Index Fund
Fund
S000001245 · Registered fund · Jun 30, 2026
Northern Funds, not summed
|
17,324 | ||
| 36.2 |
Small Cap Core Fund
Fund
S000001244 · Registered fund · Jun 30, 2026
Northern Funds, not summed
|
5,525 | ||
| 36.3 |
FlexShares Morningstar US Market Factor Tilt Index Fund
Fund
S000033312 · Registered fund · Jul 31, 2026
FlexShares Trust, not summed
|
2,212 | ||
| 37 |
VANGUARD STRATEGIC EQUITY FUND
Fund
S000002593 · Registered fund · Jun 30, 2026
VANGUARD HORIZON FUNDS, not summed
|
305,956 | ||
| 38 |
|
296,206 | ||
| 39 |
GOLDMAN SACHS GROUP INC
13F
CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
288,586 | ||
| 39.1 |
Goldman Sachs Small Cap Value Insights Fund
Fund
S000014929 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
|
47,320 | ||
| 39.2 |
Goldman Sachs Small Cap Equity Insights Fund
Fund
S000009329 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
|
46,005 | ||
| 39.3 |
Goldman Sachs ActiveBeta(R) U.S. Small Cap Equity ETF
Fund
S000048296 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust, not summed
|
11,452 | ||
| 39.4 |
Goldman Sachs Variable Insurance Trust Small Cap Equity Insights Fund
Fund
S000009355 · Registered fund · Jun 30, 2026
Goldman Sachs Variable Insurance Trust, not summed
|
4,360 | ||
| 39.5 |
Goldman Sachs Multi-Manager Global Equity Fund
Fund
S000049146 · Registered fund · Jul 31, 2026
Goldman Sachs Trust II, not summed
|
2,884 | ||
| 40 |
BRIDGEWAY CAPITAL MANAGEMENT, LLC
13F
CIK 1107261 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
252,429 | ||
| 40.1 |
Omni Small-Cap Value Fund
Fund
S000033567 · Registered fund · Jun 30, 2026
Bridgeway Funds, Inc., not summed
|
91,400 | ||
| 40.2 |
Small-Cap Value Fund
Fund
S000004427 · Registered fund · Jun 30, 2026
Bridgeway Funds, Inc., not summed
|
25,000 | ||
| 41 |
Bank of New York Mellon Corp
13F
CIK 1390777 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
247,645 | ||
| 41.1 |
BNY Mellon US Small Cap Core Equity ETF
Fund
S000067262 · Registered fund · Jul 31, 2026
BNY Mellon ETF Trust, not summed
|
1,269 | ||
| 42 |
SEI INVESTMENTS CO
13F
CIK 350894 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
244,346 | ||
| 43 |
|
238,992 | ||
| 43.1 |
College Retirement Equities Fund - Total Global Stock Account
Fund
S000005080 · Registered fund · Jun 30, 2026
College Retirement Equities Fund, not summed
|
62,096 | ||
| 43.2 |
Nuveen Small Cap Value Opportunities Fund
Fund
S000000606 · Registered fund · Jun 30, 2026
Nuveen Investment Trust, not summed
|
61,252 | ||
| 43.3 |
Nuveen Small Cap Blend Index Fund
Fund
S000005367 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
|
45,264 | ||
| 43.4 |
Nuveen Equity Index Fund
Fund
S000005360 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
|
35,182 | ||
| 43.5 |
TIAA Separate Account VA-1 - Stock Index Account
Fund
S000005098 · Registered fund · Jun 30, 2026
TIAA Separate Account VA-1, not summed
|
931 | ||
| 44 |
VANGUARD FIDUCIARY TRUST CO
13F
CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
223,986 | ||
| 45 |
Empowered Funds, LLC
13F
CIK 1592828 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
204,012 | ||
| 45.1 |
EA Bridgeway Omni Small-Cap Value ETF
Fund
S000078089 · Registered fund · Jun 30, 2026
EA Series Trust, not summed
|
136,029 | ||
| 45.2 |
Towle Value ETF
Fund
S000093635 · Registered fund · May 29, 2026
EA Series Trust, not summed
|
63,159 | ||
| 45.3 |
Sequoia Global Value ETF
Fund
S000082843 · Registered fund · May 29, 2026
EA Series Trust, not summed
|
2,712 | ||
| 45.4 |
Research Affiliates Deletions ETF
Fund
S000086056 · Registered fund · Jun 30, 2026
EA Series Trust, not summed
|
2,308 | ||
| 46 |
|
197,509 | ||
| 47 |
PDT Partners, LLC
13F
CIK 1564702 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
191,253 | ||
| 48 |
FEDERATED HERMES, INC.
13F
CIK 1056288 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
184,141 | ||
| 49 |
Allianz Asset Management GmbH
13F
CIK 1535323 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
181,838 | ||
| 49.1 |
PIMCO RAE US Small Fund
Fund
S000048957 · Registered fund · Jun 30, 2026
PIMCO Equity Series, not summed
|
116,796 | ||
| 49.2 |
PIMCO RAFI Dynamic Multi-Factor U.S. Equity ETF
Fund
S000057225 · Registered fund · Jun 30, 2026
PIMCO Equity Series, not summed
|
931 | ||
| 50 |
Qube Research & Technologies Ltd
13F
CIK 1729829 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
178,249 |
36 more nested rows are not shown here; Every filing lists them all.
Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.
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Key facts
CIK
1666138
CUSIP
047649108
13F (30d)
41 filings
22 filers
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