Amentum Holdings, Inc.
AMTM- Exchange
- NYSE
- Industry
- Services-Business Services, NEC
- SEC CIK
- 0002011286
No open-market purchases or sales by Amentum Holdings, Inc. insiders were filed in the last 90 days; 465 institutions reported holding it in 13F filings for Q2 2026, worth $4.34B in total; Soros Fund Management is the only superinvestor holding it.
Key figures
- Market capClose on Nov 11, 2026
- $5.56B
- Insider buysOpen market, last 90 days
- 0
- Insider sellsOpen market, last 90 days
- 0
- 13F holdersQ2 2026, −15 vs. previous quarter
- 465
- 13F valueReported value at the end of Q2 2026
- $4.34B
- Superinvestors holdingAt the end of Q2 2026
- 1
Price chart
Financials
See financial statementsFrom SEC filings, in USD.
- Revenue, FY2025
- $14.4B
- +71.6% year over year
- Net income, FY2025
- $66.0M
- No comparable prior period
- Free cash flow, FY2025
- $516.0M
- +1,333.3% year over year
- Revenue, Q3 FY2026
- $3.49B
- −2.0% year over year
Revenue flow, FY2025
Green is profit; orange is costs, expenses and taxes. Percentages are shares of revenue.
Short interest
See short dataFrom FINRA, settlement date Oct 30, 2026.
- Short interest
- 14.0M
- Shares sold short
- Change
- +1.38M
- +10.9% vs. previous
- Days to cover
- 7.22
- At average daily volume
Superinvestors holding AMTM, Q2 2026
Go to the superinvestors tab1 superinvestor reports holding Amentum Holdings, Inc. on Form 13F. Percentages are the stock's share of each portfolio.
Soros Fund Management
George Soros
<0.1%
Amentum Holdings, Inc.'s share of the portfolio
- Shares
- 118,276
- Value
- $2.44M
Latest insider trades
See all insider tradesOpen-market purchases and sales by Amentum Holdings, Inc. insiders from Form 4, newest first.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Feb 20, 2025 (view filing) | Feb 18 | 2 days | Loughran BarbaraDirector | PPurchase | +4.60K | $21.23 | +$97.7K | New position4.60K after | |
| Feb 14, 2025 (view filing) | Feb 12 | 2 days | Demetriou Steven J.Executive Chair | PPurchase | +100.0K | $20.81 | +$2.08M | +19.2%620.9K after |
Top 10 13F holders, Q2 2026
See all 465 holdersThe largest institutional positions in Amentum Holdings, Inc. at the end of Q2 2026; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| American Securities LLC | 45,026,743 | $930.7M | 24.79% | 00.0% | Unchanged |
| Invesco Ltd. | 24,954,251 | $515.8M | 0.04% | +3,480,473+16.2% | Added |
| BlackRock, Inc. | 17,906,984 | $370.1M | 0.01% | +65,701+0.4% | Added |
| Primecap Management Co | 12,285,504 | $253.9M | 0.15% | +200,210+1.7% | Added |
| Vanguard Portfolio Management LLC | 7,948,385 | $164.3M | 0.01% | +95,434+1.2% | Added |
| Vanguard Capital Management LLC | 6,711,987 | $138.7M | 0.00% | +61,108+0.9% | Added |
| FMR LLC | 5,679,175 | $117.4M | 0.01% | +100,789+1.8% | Added |
| Dimensional Fund Advisors LP | 5,537,696 | $114.5M | 0.02% | +1,750,276+46.2% | Added |
| State Street Corp | 5,151,772 | $106.5M | 0.00% | +72,731+1.4% | Added |
| Frontier Capital Management Co LLC | 4,143,971 | $85.7M | 0.80% | −786,239−15.9% | Reduced |
Holders of 5% or more of AMTM
See all 5 holders and filingsHolders whose latest Schedule 13D or 13G filing reports 5% or more of Amentum Holdings, Inc..
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| ASP Manager Corp. | 13D | 18.04%43.9M shares | New | Dec 23, 20241 filing | Dec 23, 2024 | SEC |
| Goldberg Alan E | 13D | 18.00%43.9M shares | New | Dec 23, 20241 filing | Dec 23, 2024 | SEC |
| Invesco Ltd. | 13G/A | 10.10%24.5M shares | +1.00 ppfrom 9.10% | Feb 7, 20254 filings | May 7, 2026 | SEC |
| BlackRock, Inc. | 13G/A | 6.90%16.8M shares | – | Oct 24, 20243 filings | Feb 5, 2025 | SEC |
| Primecap Management Co | 13G | 5.03%12.3M shares | New | Aug 6, 20261 filing | Aug 6, 2026 | SEC |
Politician trades
All politician trades in AMTM2 members of Congress reported 5 trades in Amentum Holdings, Inc. since 2020. Newest filings:
| Filed | Politician | Type | Amount |
|---|---|---|---|
| Nov 6, 2024 |  William R. Keating House · MA | Sell | $1K-$15K |
| Oct 15, 2024 |  Thomas H. Kean, Jr. House · NJ | Exchange | $1K-$15K |
| Oct 15, 2024 | Thomas H. Kean, Jr. House · NJ | Exchange | $1K-$15K |
| Oct 15, 2024 | Thomas H. Kean, Jr. House · NJ | Exchange | $1K-$15K |
| Oct 15, 2024 | Thomas H. Kean, Jr. House · NJ | Exchange | $1K-$15K |
House · MA · Nov 6, 2024
Sell$1K-$15K
House · NJ · Oct 15, 2024
Exchange$1K-$15K
House · NJ · Oct 15, 2024
Exchange$1K-$15K
House · NJ · Oct 15, 2024
Exchange$1K-$15K
House · NJ · Oct 15, 2024
Exchange$1K-$15K