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AMTM · Amentum Holdings, Inc. · Shareholders & Ownership

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$21.76 +0.47 (+2.21%) At close · Oct 23
Market Cap
$5.32B
Shares
244.51M
Volume · Oct 23 2.08M Avg daily vol (3M) 2.02M

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 positions

No 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
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
Goldberg 2014 LLC
Insider CIK 2037981 · May 8, 2025
10% Owner, issuer-wide
45,026,743
3
GOLDBERG ALAN E
Insider CIK 1077430 · May 8, 2025
Director, 10% Owner, issuer-wide
45,026,743
3.1
Alan E. Goldberg
13D CIK 1077430 · Unknown · Dec 17, 2024
not summed
43,893,904
4
Lindsay Goldberg Employee Co-Inv. IV L.P.
Insider CIK 2037350 · May 8, 2025
10% Owner, issuer-wide
45,026,743
5
ASP Amentum Investco LP
Insider CIK 2050378 · Dec 17, 2024
10% Owner, issuer-wide
43,893,904
6
ASP Manager Corp.
Insider CIK 1621183 · Dec 17, 2024
10% Owner, issuer-wide, not summed
43,893,904
6.1
ASP Manager Corp.
13D CIK 1621183 · Unknown · Dec 17, 2024
not summed
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
STATE STREET CORP
13F CIK 93751 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
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
UBS Group AG
13F CIK 1610520 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
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
DEMETRIOU STEVEN J.
Insider CIK 1173003 · Nov 17, 2025
Director, issuer-wide
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.

Showing 1–50 of 607 holders

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Key facts CIK 2011286 CUSIP 023939101 13F (30d) 83 filings 83 filers Visit website Investor relations