AMTM Institutional Ownership
Who owns Amentum Holdings, Inc. and what the big funds did with it last quarter, from every SEC 13F filing. 461 funds reported holding AMTM at Jun 30, 2026, together owning 89.6% of the company.
- ▼200 buying vs 230 selling
- ▲Held by funds +3.3 pts
- ▼Funds holding -27
- ▲Superinvestors: 4 added, 1 cut
- ●Put/call not meaningful
What the filings show, not a forecast. Positions can be up to 45 days old and leave out short sales.
Funds holding and ownership
8 quartersQuarter over quarter
all 13F filers| Q2 2026 | This quarter | Q1 2026 | Change |
|---|---|---|---|
| Funds holding | 461 | 488 | −5.5% |
| In funds' top 10 | 4 | 9 | −55.6% |
| 13F shares | 219M | 211M | +3.8% |
| Held by funds | 89.6% | 86.3% | +3.3 pts |
| New positions | 53 | 62 | −14.5% |
| Increased | 147 | 151 | −2.6% |
| Reduced | 156 | 150 | +4.0% |
| Sold out | 74 | 61 | +21.3% |
| Calls (shares) | 1.4M | 3.8M | −62.9% |
| Puts (shares) | 169K | 808K | −79.1% |
| Put/call ratio | 0.12 | 0.21 | −43.7% |
Buyers vs sellers
adding or new vs cutting or sold outSuperinvestors in AMTM
All superinvestors →
Who owns AMTM
share of fund held shares- Index and passive funds35.7%
- Active managers and hedge funds55.9%
- Banks and brokers6.5%
- Pensions, insurers and other1.8%
The top 10 holders own 64.0% of all AMTM shares that funds reported. Groups are our own grouping of filers by name.
Put/call ratio
funds' options, market makers left outAbove 1 means funds hold more puts than calls, a sign of hedging or bets on a fall. Options are valued at the underlying shares.
Filed so far for Q3 2026
110 funds changed their position- Segra Capital Management, LLCTrimmed−1.3M sh
- Legacy Advisors, LLCSold out−9.1M sh
- CenterBook Partners LPSold out−329K sh
- Oppenheimer & Co IncTrimmed−116K sh
- Oak Thistle LLCNew+88K sh
🔒 Free account: see all 20.
Top holders
Q2 2026| # | Fund | Of company | Shares | Value | Change |
|---|---|---|---|---|---|
| 1 | American Securities LLC | 18.42% | 45M | $931M | 0 |
| 2 | Invesco Ltd. | 10.21% | 25M | $516M | +3.5M |
| 3 | BlackRock, Inc. | 7.32% | 17.9M | $370M | +66K |
| 4 | Primecap Management Co/ca/ | 5.02% | 12.3M | $254M | +200K |
| 5 | Legacy Advisors, LLC | 3.71% | 9.1M | $9.1M | +1,399 |
| 6 | Vanguard Portfolio Management LLC | 3.25% | 7.9M | $164M | +95K |
| 7 | Vanguard Capital Management LLC | 2.75% | 6.7M | $139M | +61K |
| 8 | Fmr LLC | 2.32% | 5.7M | $117M | +101K |
| 9 | Dimensional Fund Advisors LP | 2.26% | 5.5M | $114M | +1.8M |
| 10 | State Street Corp | 2.11% | 5.2M | $106M | +73K |
- Invesco Ltd.+3.5M sh+$71.9M
- Troluce Capital Advisors LLC+2.6M sh+$53M
- Dimensional Fund Advisors LP+1.8M sh+$36.2M
- Goldman Sachs Group Inc+1.6M sh+$32.7M
- Norges Bank+1.5M sh+$31.3M
- Millennium Management LLC+1.5M sh+$30.9M
- Van Eck Associates Corp+1.4M sh+$29.8M
- Qube Research & Technologies Ltd+957K sh+$19.8M
- Focus Partners Wealth−2.5M sh−$51M
- Toronto Dominion Bank−1.6M sh−$40.8M
- Brightline Capital Management, LLC−1.4M sh−$36.4M
- Arvin Capital Management LP−1.7M sh−$34.2M
- Cooper Creek Partners Management LLC−929K sh−$24.2M
- Ruane, Cunniff & Goldfarb L.P.−1.1M sh−$22.4M
- Point72 Asset Management, L.P.−981K sh−$20.3M
- Penn Capital Management Company, LLC−694K sh−$18.2M
AMTM institutional ownership FAQ
Who owns the most AMTM stock?
In Q2 2026 13F filings the largest holder of AMTM was American Securities LLC, followed by Invesco Ltd. and BlackRock, Inc.. Index fund managers are usually the biggest holders of large companies.
What percentage of AMTM is owned by institutions?
Funds that file 13F reports held 89.6% of AMTM's shares at Jun 30, 2026, compared with 86.3% a quarter earlier. That counts every manager with more than $100 million in US stocks.
Are hedge funds buying AMTM?
In Q2 2026, 200 funds bought AMTM (53 of them new positions) and 230 sold (74 sold out completely). Among well known investors, 4 added and 1 cut. Our fund sentiment for AMTM is neutral.
What is AMTM's institutional put/call ratio?
Funds reported $3.5M of AMTM puts against $29.3M of calls, a put/call ratio of 0.12 (0.21 the quarter before). Market makers and bank trading desks are left out, since their options are mostly hedges.
How current is this AMTM ownership data?
13F filings show holdings at the end of each quarter and are due within 45 days, so positions can be up to six weeks old when they appear. We add each new filing within minutes, and the "filed so far" list shows funds that have already reported the next quarter.
For informational and educational purposes only. Not investment advice, and not a recommendation to buy or sell any security. Fund sentiment summarises what 13F filings show and is not a forecast. Holdings come from SEC Form 13F filings as reported and show positions at the end of the quarter, up to 45 days before the filing. A 13F leaves out short positions, cash, bonds and most foreign holdings. See all hedge fund holdings.