Latest Period
Q4 2025
Security Snapshot
Amentum Holdings, Inc. - Common Stock (AMTM) Institutional Ownership
CUSIP: 023939101
13F Institutional Holders and Ownership History from Q3 2024 to Q1 2026
Institutions Reporting
478
Shares (Excl. Options)
193,975,944
Price
$29.00
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- Type / Class
- Equity / Common Stock
- Symbol
- AMTM on NYSE
- Shares outstanding
- 242,870,683
- Price per share
- $27.57
- All holders as of 31 Dec 2025
- Q4 2025
- Total 13F shares
- 193,975,944
- Total reported value
- $5,626,569,576
- % of total 13F portfolios
- 0.01%
- Share change
- +335,059
- Value change
- +$53,150,703
- Number of holders
- 478
- Price from insider filings
- $27.57
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Quick Takeaways
- AMTM - Amentum Holdings, Inc. - Common Stock is tracked under CUSIP 023939101.
- 478 institutions reported positions in Q4 2025.
- 4 significant owners is listed from Schedule 13D/13G reporting.
What Changed
- Holder count moved from 478 to 288 between Q4 2025 and Q1 2026.
- Reported value moved from $5,626,569,576 to $1,968,671,950.
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
Open SEC Evidence
Latest holder context comes from 478 institutions filings for Q4 2025.
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.
Next ownership checks
Use the next link that matches the question you still need to answer about this security.
- Latest 13F filings when you want to inspect fresh institutional portfolio moves.
- Latest Schedule 13D/13G reports when you need large-owner changes outside the 13F cycle.
- All institutional ownership pages to compare this security with other holder-history pages.
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 023939101:
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. | 10% | +11% | $676,290,418 | +$66,529,277 | 24,529,939 | +11% | Invesco Ltd. | 30 Apr 2026 |
| BlackRock, Inc. | 6.9% | $372,220,408 | 16,774,241 | BlackRock, Inc. | 31 Dec 2024 |
As of 31 Dec 2025, 478 institutional investors reported holding 193,975,944 shares of Amentum Holdings, Inc. - Common Stock (AMTM). This represents 80% of the company’s total 242,870,683 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 | 1.2% | 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 | 75,491,047 | $1,968,671,950 | +$82,600,062 | $26.08 | 288 |
| 2025 Q4 | 193,975,944 | $5,626,569,576 | +$53,150,703 | $29.00 | 478 |
| 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 |