Security Snapshot

Amentum Holdings, Inc. - Common Stock (AMTM) Institutional Ownership

CUSIP: 023939101

13F Institutional Holders and Ownership History from Q3 2024 to Q1 2026

Latest Period

Q4 2025

Institutions Reporting

476

Shares (Excl. Options)

193,974,866

Price

$29.00

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Type / Class
Equity / Common Stock
Symbol
AMTM on NYSE
Shares outstanding
243,042,143
Price per share
$26.08
All holders as of 31 Dec 2025
Q4 2025
Total 13F shares
193,974,866
Total reported value
$5,626,538,314
% of total 13F portfolios
0.01%
Share change
+334,980
Value change
+$53,148,412
Number of holders
476
Price from insider filings
$26.08
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

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Quick Takeaways

  • AMTM - Amentum Holdings, Inc. - Common Stock is tracked under CUSIP 023939101.
  • 476 institutions reported positions in Q4 2025.
  • 4 significant owners is listed from Schedule 13D/13G reporting.

What Changed

  • Holder count moved from 476 to 36 between Q4 2025 and Q1 2026.
  • Reported value moved from $5,626,538,314 to $23,715,135.

Why This Matters

  • You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
  • 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.

Source Evidence

Source: SEC Form 13F

Latest holder context comes from 476 institutions filings for Q4 2025.

Open SEC Evidence

Investment Quick Answers

What is CUSIP 023939101?
CUSIP 023939101 identifies AMTM - Amentum Holdings, Inc. - Common Stock in SEC 13F datasets.

Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.

Significant Owners of Amentum Holdings, Inc. - Common Stock (AMTM) based on Schedule 13D/G filings

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
ASP Manager Corp. 18% $974,005,730 43,893,904 ASP Manager Corp. 17 Dec 2024
GOLDBERG ALAN E 18% $974,005,730 43,893,904 Alan E. Goldberg 17 Dec 2024
Invesco Ltd. 9.1% +29% $529,698,198 +$117,971,114 22,116,835 +29% Invesco Ltd. 30 Sep 2025
BlackRock, Inc. 6.9% $372,220,408 16,774,241 BlackRock, Inc. 31 Dec 2024

As of 31 Dec 2025, 476 institutional investors reported holding 193,974,866 shares of Amentum Holdings, Inc. - Common Stock (AMTM). This represents 80% of the company’s total 243,042,143 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of Amentum Holdings, Inc. - Common Stock (AMTM) together control 66% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.

Institution Ownership % Shares Held Share Change % Portfolio % Holdings Value
AMERICAN SECURITIES LLC 19% 45,026,743 0% 100% $1,305,775,547
Invesco Ltd. 9% 21,834,003 -1.3% 0.1% $633,186,097
BlackRock, Inc. 7.2% 17,459,099 -3% 0.01% $506,313,859
VANGUARD GROUP INC 6.3% 15,411,745 -0.92% 0.01% $446,940,605
PRIMECAP MANAGEMENT CO/CA/ 5% 12,126,927 +1.7% 0.27% $351,680,883
FMR LLC 2.8% 6,707,304 +7.6% 0.01% $194,511,815
FRONTIER CAPITAL MANAGEMENT CO LLC 2.4% 5,772,976 +11% 1.8% $167,416,293
STATE STREET CORP 2.1% 5,061,620 -26% 0% $146,786,980
Focus Partners Wealth 1.1% 2,794,417 +8468% 0.09% $81,038,102
GEODE CAPITAL MANAGEMENT, LLC 1.1% 2,659,364 +0.2% 0% $77,145,389
Ruane, Cunniff & Goldfarb L.P. 0.99% 2,394,129 -1.2% 1.1% $69,429,741
NORGES BANK 0.94% 2,294,097 0.01% $66,528,813
MORGAN STANLEY 0.85% 2,075,352 +15% 0% $60,185,252
Thrivent Financial for Lutherans 0.85% 2,069,104 +15% 0.11% $60,004,000
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. 0.81% 1,961,927 -5.7% 0.09% $56,895,904
CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.8% 1,952,002 +6% 0.01% $56,608,065
THOMPSON SIEGEL & WALMSLEY LLC 0.79% 1,921,809 -30% 0.94% $55,732,000
DIMENSIONAL FUND ADVISORS LP 0.75% 1,832,926 +40% 0.01% $53,156,787
Arvin Capital Management LP 0.67% 1,636,492 0% 10% $47,458,268
COOPER CREEK PARTNERS MANAGEMENT LLC 0.64% 1,553,074 2.1% $45,039,000
AQR CAPITAL MANAGEMENT LLC 0.6% 1,452,049 +779% 0.02% $42,109,421
FIL Ltd 0.59% 1,429,384 -8.3% 0.03% $41,452,136
BRIGHTLINE CAPITAL MANAGEMENT, LLC 0.57% 1,392,000 +16% 16% $40,368,000
ExodusPoint Capital Management, LP 0.49% 1,184,186 +1015% 0.38% $34,341,394
BANK OF AMERICA CORP /DE/ 0.48% 1,157,427 +45% 0% $33,565,383

Institutional Holders of Amentum Holdings, Inc. - Common Stock (AMTM) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2026 Q1 906,351 $23,715,135 +$2,920,351 $26.08 36
2025 Q4 193,974,866 $5,626,538,314 +$53,148,412 $29.00 476
2025 Q3 193,380,844 $4,630,241,431 -$164,141,118 $23.95 457
2025 Q2 200,286,307 $4,728,932,149 +$283,438,102 $23.61 449
2025 Q1 189,918,108 $3,456,762,603 +$424,243,410 $18.20 410
2024 Q4 180,057,223 $3,789,816,275 +$1,468,894,480 $21.03 445
2024 Q3 99,712,565 $3,204,357,186 +$2,913,258,016 $32.25 480

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