AMTM · Amentum Holdings, Inc. · Shareholders & Ownership
Every disclosed holder of AMTM 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 AMTM
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) | 208,575,869 | 85.30% |
| Insiders (Forms 3, 4, 5) | 181,268,045 | 74.14% |
| 13D/G-only blocks | 0 | 0.00% |
| Remaining | 145,337,501 | -59.44% |
| Registered funds (N-PORT, not summed) | 75,593,936 | 30.92% |
Shares outstanding: 244,506,413, 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 AMTM
| # | Holder | Shares | As of | Notes |
|---|---|---|---|---|
| 1 |
AMERICAN SECURITIES LLC
13F
CIK 1475483 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
45,026,743 | ||
| 2 |
|
45,026,743 | ||
| 3 |
|
45,026,743 | ||
| 3.1 |
|
43,893,904 | ||
| 4 |
|
45,026,743 | ||
| 5 |
|
43,893,904 | ||
| 6 |
|
43,893,904 | ||
| 6.1 |
|
43,893,904 | ||
| 7 |
Invesco Ltd.
13F
CIK 914208 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
24,954,251 | ||
| 7.1 |
Invesco Small Cap Value Fund
Fund
S000027837 · Registered fund · Jul 31, 2026
AIM Sector Funds (Invesco Sector Funds), not summed
|
4,226,948 | ||
| 7.2 |
Invesco Value Opportunities Fund
Fund
S000027840 · Registered fund · Jul 31, 2026
AIM Sector Funds (Invesco Sector Funds), not summed
|
2,945,078 | ||
| 7.3 |
Invesco S&P SmallCap Momentum ETF
Fund
S000003024 · Registered fund · Jul 31, 2026
Invesco Exchange-Traded Fund Trust, not summed
|
1,249,733 | ||
| 7.4 |
Invesco Aerospace & Defense ETF
Fund
S000003039 · Registered fund · Jul 31, 2026
Invesco Exchange-Traded Fund Trust, not summed
|
1,045,746 | ||
| 7.5 |
Invesco S&P SmallCap 600 Revenue ETF
Fund
S000064596 · Registered fund · May 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
|
565,116 | ||
| 8 |
BlackRock, Inc.
13F
CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
17,906,984 | ||
| 8.1 |
iShares Core S&P Small-Cap ETF
Fund
S000004313 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
9,273,929 | ||
| 8.2 |
iShares S&P Small-Cap 600 Value ETF
Fund
S000004316 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
1,325,120 | ||
| 8.3 |
iShares Russell Mid-Cap ETF
Fund
S000004338 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
626,321 | ||
| 8.4 |
iShares Russell 1000 Value ETF
Fund
S000004345 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
341,317 | ||
| 8.5 |
iShares Russell Mid-Cap Value ETF
Fund
S000004335 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
234,559 | ||
| 9 |
PRIMECAP MANAGEMENT CO/CA/
13F
CIK 763212 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
12,285,504 | ||
| 9.1 |
PRIMECAP MANAGEMENT CO/CA/
13G
CIK 763212 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
|
12,285,504 | ||
| 9.2 |
VANGUARD PRIMECAP CORE FUND
Fund
S000002581 · Registered fund · Jun 30, 2026
VANGUARD FENWAY FUNDS, not summed
|
5,516,796 | ||
| 9.3 |
VANGUARD CAPITAL OPPORTUNITY FUND
Fund
S000002594 · Registered fund · Jun 30, 2026
VANGUARD HORIZON FUNDS, not summed
|
2,506,552 | ||
| 9.4 |
PRIMECAP Odyssey Stock Fund
Fund
S000005539 · Registered fund · Jul 31, 2026
PRIMECAP Odyssey Funds, not summed
|
1,879,566 | ||
| 9.5 |
PRIMECAP Odyssey Aggressive Growth Fund
Fund
S000005541 · Registered fund · Jul 31, 2026
PRIMECAP Odyssey Funds, not summed
|
768,234 | ||
| 10 |
VANGUARD PORTFOLIO MANAGEMENT LLC
13F
CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
7,948,385 | ||
| 11 |
VANGUARD CAPITAL MANAGEMENT LLC
13F
CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
6,711,987 | ||
| 12 |
FMR LLC
13F
CIK 315066 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
5,679,175 | ||
| 12.1 |
Fidelity Value Fund
Fund
S000005455 · Registered fund · Jul 31, 2026
Fidelity Capital Trust, not summed
|
2,662,800 | ||
| 12.2 |
Fidelity Stock Selector Small Cap Fund
Fund
S000005453 · Registered fund · Jul 31, 2026
Fidelity Capital Trust, not summed
|
941,533 | ||
| 12.3 |
Fidelity Extended Market Index Fund
Fund
S000006021 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
|
797,188 | ||
| 12.4 |
Fidelity Mid Cap Index Fund
Fund
S000033637 · Registered fund · Jul 31, 2026
Fidelity Salem Street Trust, not summed
|
577,886 | ||
| 12.5 |
Fidelity Advisor Value Strategies Fund
Fund
S000005117 · Registered fund · May 31, 2026
Fidelity Advisor Series I, not summed
|
481,300 | ||
| 13 |
DIMENSIONAL FUND ADVISORS LP
13F
CIK 354204 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
5,537,696 | ||
| 13.1 |
U.S. Targeted Value Portfolio
Fund
S000000970 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
|
1,120,249 | ||
| 13.2 |
Dimensional U.S. Targeted Value ETF
Fund
S000070901 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
|
1,080,243 | ||
| 13.3 |
Dimensional US Small Cap Value ETF
Fund
S000075151 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
|
800,538 | ||
| 13.4 |
U.S. SMALL CAP VALUE PORTFOLIO
Fund
S000000987 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
|
639,128 | ||
| 13.5 |
Dimensional U.S. Core Equity 2 ETF
Fund
S000070903 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
|
389,934 | ||
| 14 |
|
5,151,772 | ||
| 14.1 |
State Street(R) SPDR(R) Portfolio S&P 600(TM) Small Cap ETF
Fund
S000041317 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
1,416,757 | ||
| 14.2 |
State Street(R) SPDR(R) S & P 600(TM) Small Cap Value ETF
Fund
S000006974 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
800,807 | ||
| 14.3 |
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund
S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
|
54,100 | ||
| 14.4 |
State Street(R) SPDR(R) Portfolio S&P 1500(R) Composite Stock Market ETF
Fund
S000006973 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
29,970 | ||
| 14.5 |
State Street(R) SPDR(R) S&P(R) 1500 Value Tilt ETF
Fund
S000033831 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
7,876 | ||
| 15 |
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund
S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
4,653,337 | ||
| 16 |
FRONTIER CAPITAL MANAGEMENT CO LLC
13F
CIK 351173 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
4,143,971 | ||
| 17 |
Troluce Capital Advisors LLC
13F
CIK 1910321 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,565,399 | ||
| 18 |
VANGUARD SMALL-CAP INDEX FUND
Fund
S000002845 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
3,363,425 | ||
| 19 |
GEODE CAPITAL MANAGEMENT, LLC
13F
CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,716,560 | ||
| 20 |
GOLDMAN SACHS GROUP INC
13F
CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,711,866 | ||
| 20.1 |
Goldman Sachs Small Cap Value Fund
Fund
S000009323 · Registered fund · May 31, 2026
Goldman Sachs Trust, not summed
|
179,838 | ||
| 20.2 |
Goldman Sachs Small Cap Equity ETF
Fund
S000081978 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust, not summed
|
59,892 | ||
| 20.3 |
Goldman Sachs MarketBeta U.S. 1000 Equity ETF
Fund
S000075322 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust II, not summed
|
4,943 | ||
| 20.4 |
Goldman Sachs Absolute Return Tracker Fund
Fund
S000020314 · Registered fund · Aug 31, 2026
GOLDMAN SACHS TRUST, not summed
|
4,859 | ||
| 20.5 |
Goldman Sachs MarketBeta(R) Russell 1000 Value Equity ETF
Fund
S000083006 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust, not summed
|
1,932 | ||
| 21 |
MORGAN STANLEY
13F
CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,662,329 | ||
| 21.1 |
E*TRADE No Fee Total Market Index Fund
Fund
S000090722 · Registered fund · Jul 31, 2026
E Trade Trust, not summed
|
207 | ||
| 22 |
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.
13F
CIK 1705339 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,318,581 | ||
| 23 |
THOMPSON SIEGEL & WALMSLEY LLC
13F
CIK 1008322 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,281,945 | ||
| 24 |
VANGUARD SMALL-CAP VALUE INDEX FUND
Fund
S000002847 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
2,129,618 | ||
| 25 |
MILLENNIUM MANAGEMENT LLC
13F
CIK 1273087 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,127,779 | ||
| 26 |
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F
CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,120,102 | ||
| 26.1 |
Schwab U.S. Small-Cap ETF
Fund
S000026636 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
|
738,806 | ||
| 26.2 |
Schwab U.S. Mid-Cap ETF
Fund
S000026635 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
|
416,858 | ||
| 26.3 |
Schwab Fundamental U.S. Small Company ETF
Fund
S000040878 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
|
316,271 | ||
| 26.4 |
Schwab Fundamental U.S. Small Company Index Fund
Fund
S000016767 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
|
107,167 | ||
| 26.5 |
Schwab Total Stock Market Index Fund
Fund
S000005913 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
|
95,046 | ||
| 27 |
Thrivent Financial for Lutherans
13F
CIK 314984 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,105,802 | ||
| 27.1 |
THRIVENT LARGE CAP VALUE PORTFOLIO
Fund
S000001428 · Registered fund · Jun 30, 2026
Thrivent Series Fund, Inc., not summed
|
661,340 | ||
| 27.2 |
THRIVENT LARGE CAP VALUE FUND
Fund
S000001366 · Registered fund · Jul 31, 2026
Thrivent Mutual Funds, not summed
|
642,939 | ||
| 27.3 |
THRIVENT GLOBAL STOCK FUND
Fund
S000001365 · Registered fund · Jul 31, 2026
Thrivent Mutual Funds, not summed
|
103,619 | ||
| 27.4 |
THRIVENT SMALL CAP INDEX PORTFOLIO
Fund
S000001446 · Registered fund · Jun 30, 2026
Thrivent Series Fund, Inc., not summed
|
101,073 | ||
| 27.5 |
THRIVENT MODERATELY AGGRESSIVE ALLOCATION FUND
Fund
S000001347 · Registered fund · Jul 31, 2026
Thrivent Mutual Funds, not summed
|
96,891 | ||
| 28 |
BANK OF AMERICA CORP /DE/
13F
CIK 70858 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,042,897 | ||
| 29 |
Verition Fund Management LLC
13F
CIK 1454027 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,019,334 | ||
| 30 |
VAN ECK ASSOCIATES CORP
13F
CIK 869178 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,988,898 | ||
| 31 |
VOYA INVESTMENT MANAGEMENT LLC
13F
CIK 1068837 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,974,191 | ||
| 32 |
VANGUARD EXTENDED MARKET INDEX FUND
Fund
S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
1,765,443 | ||
| 33 |
|
1,545,183 | ||
| 34 |
NORGES BANK
13F
CIK 1374170 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,516,193 | ||
| 35 |
Permian Investment Partners, LP
13F
CIK 1472850 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,433,028 | ||
| 36 |
683 Capital Management, LLC
13F
CIK 1404574 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,100,000 | ||
| 37 |
LOOMIS SAYLES & CO L P
13F
CIK 312348 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,042,522 | ||
| 37.1 |
Loomis Sayles Small Cap Value Fund
Fund
S000006647 · Registered fund · Jun 30, 2026
LOOMIS SAYLES FUNDS I, not summed
|
121,452 | ||
| 38 |
Qube Research & Technologies Ltd
13F
CIK 1729829 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,034,395 | ||
| 39 |
NORTHERN TRUST CORP
13F
CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,029,892 | ||
| 39.1 |
FlexShares Morningstar US Market Factor Tilt Index Fund
Fund
S000033312 · Registered fund · Jul 31, 2026
FlexShares Trust, not summed
|
39,974 | ||
| 40 |
VANGUARD TAX-MANAGED SMALL-CAP FUND
Fund
S000004387 · Registered fund · Jun 30, 2026
VANGUARD TAX-MANAGED FUNDS, not summed
|
996,603 | ||
| 41 |
VANGUARD FIDUCIARY TRUST CO
13F
CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
968,451 | ||
| 42 |
Bank of New York Mellon Corp
13F
CIK 1390777 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
878,084 | ||
| 42.1 |
BNY Mellon US Small Cap Core Equity ETF
Fund
S000067262 · Registered fund · Jul 31, 2026
BNY Mellon ETF Trust, not summed
|
5,703 | ||
| 43 |
CACTI ASSET MANAGEMENT LLC
13F
CIK 1452208 · Registered investment adviser · Sep 30, 2026
|
875,097 | ||
| 44 |
|
844,026 | ||
| 45 |
Russell Investments Group, Ltd.
13F
CIK 1692234 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
840,642 | ||
| 45.1 |
Tax-Managed U.S. Mid & Small Cap Fund
Fund
S000001571 · Registered fund · Jul 31, 2026
RUSSELL INVESTMENT CO, not summed
|
120,750 | ||
| 45.2 |
Russell Investments U.S. Small Cap Equity ETF
Fund
S000089990 · Registered fund · Jun 30, 2026
Russell Investments Exchange Traded Funds, not summed
|
6,220 | ||
| 46 |
AVENIR CORP
13F
CIK 1033475 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
811,726 | ||
| 47 |
SEGRA CAPITAL MANAGEMENT, LLC
13F
CIK 1607512 · Registered investment adviser · Sep 30, 2026
|
774,867 | ||
| 48 |
WELLS FARGO & COMPANY/MN
13F
CIK 72971 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
750,214 | ||
| 49 |
PRINCIPAL FINANCIAL GROUP INC
13F
CIK 1126328 · Insurance company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
742,381 | ||
| 49.1 |
SmallCap S&P 600 Index Fund
Fund
S000007203 · Registered fund · Jul 31, 2026
Principal Funds, Inc, not summed
|
113,404 | ||
| 49.2 |
SmallCap Value Fund II
Fund
S000007169 · Registered fund · Jul 31, 2026
Principal Funds, Inc, not summed
|
62,500 | ||
| 49.3 |
MidCap Value Fund I
Fund
S000007173 · Registered fund · Jul 31, 2026
Principal Funds, Inc, not summed
|
3,435 | ||
| 50 |
Ancora Advisors LLC
13F
CIK 1446114 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
715,652 | ||
| 50.1 |
Ancora/Thelen Small-Mid Cap Fund
Fund
S000039307 · Registered fund · Jun 30, 2026
ANCORA TRUST, not summed
|
230,038 |
83 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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