AMTM
Amentum Holdings, Inc.Marquee-fund ownership over time
This quarter's activity
New positions opened
Positions exited
None.
Current holders
Sorted by tenure (longest first)| Fund | First disclosed | Held | Entry price | Latest close | Return on entry |
|---|---|---|---|---|---|
| Bridgewater Associates re-entered | Q4 2024 | 6Q | $30 | $23 | -21% |
| Citadel Advisors | Q4 2024(8Q snapshot) | 6Q | $26 | $23 | -12% |
| Soros Fund Management re-entered | Q4 2024(8Q snapshot) | 6Q | $26 | $23 | -12% |
| Two Sigma Investments re-entered | Q4 2024(8Q snapshot) | 6Q | $26 | $23 | -12% |
| D.E. Shaw re-entered | Q4 2024(8Q snapshot) | 6Q | $26 | $23 | -12% |
| AQR Capital Management re-entered | Q4 2024(8Q snapshot) | 6Q | $26 | $23 | -12% |
| Millennium Management | Q4 2024(8Q snapshot) | 6Q | $26 | $23 | -12% |
| Point72 Asset Management re-entered | Q4 2024(8Q snapshot) | 6Q | $26 | $23 | -12% |
| Maverick Capital | Q2 2026 | 1Q | $23 | $23 | +1% |
“Return on entry” is the price-only move from the fund's first disclosure to today — it ignores any adds, trims, or dividends. A fund that built its position over multiple quarters has a true cost basis somewhere between entry price and latest close; this figure is the upper bound.
Past holders
Funds that exited at some point| Fund | Last entry | Exited | Entry → Exit | Return |
|---|---|---|---|---|
| Renaissance Technologies | Q4 2024 | Q3 2025 | → $27 | -10% |
Insider activity
Form 4 — officers, directors, 10%+ ownersFiled within two business days of each transaction by anyone with material insider status at Amentum Holdings, Inc.. Pair with the holders table above as a sanity check: heavy insider buying alongside marquee-fund accumulation is the strongest accumulation signal; heavy insider selling alongside fund exits is the strongest distribution signal.
30d / 90d windows measured from May 7, 2026 — the most recent Form 4 on file — not from today.
- Form 40002011286-26-000021May 7, 2026
- Form 40002011286-26-000020May 7, 2026
- Form 40002011286-26-000019May 7, 2026
- Form 40002011286-26-000018May 7, 2026
- Form 40002011286-26-000017May 7, 2026
- Form 40001628280-26-015158Mar 5, 2026
- Form 40001628280-26-014626Mar 4, 2026
- Form 40001628280-26-009269Feb 18, 2026
- Form 40001628280-26-006839Feb 10, 2026
- Form 40001628280-26-006837Feb 10, 2026
- Form 40001628280-26-006835Feb 10, 2026
- Form 40001628280-26-006831Feb 10, 2026
- Form 4/Aamend0001628280-26-006829Feb 10, 2026
- Form 40001628280-26-006828Feb 10, 2026
- Form 40001628280-26-006827Feb 10, 2026
Fundamentals
XBRL · Amentum Holdings, Inc.Annual figures sourced directly from Amentum Holdings, Inc.'s 10-K / 10-Q filings via SEC EDGAR XBRL. Latest fiscal year and the year-over-year change, with up to ten years of history.
Recent SEC filings
10-K · 10-Q · 8-K · 13D/G · proxyThe most recent material filings for Amentum Holdings, Inc. — earnings, material events, ownership disclosures, proxy statements. Form 4 insider activity is shown in the panel above.
- 10-QFORM 10-QMay 12, 2026
- 8-KFORM 8-KMay 11, 2026
- 8-KFORM 8-KApr 28, 2026
- 8-KFORM 8-KFeb 10, 2026
- 10-QFORM 10-QFeb 10, 2026
- 8-KFORM 8-KFeb 9, 2026
- DEF 14AFORM DEF 14ADec 19, 2025
- 10-KFORM 10-KNov 25, 2025
- 8-KFORM 8-KNov 24, 2025
- 10-QFORM 10-QAug 6, 2025
- 8-KFORM 8-KAug 5, 2025
- 10-QFORM 10-QMay 7, 2025
- 8-KFORM 8-KMay 6, 2025
- S-1Registration (IPO)Mar 10, 2025
- 8-KFORM 8-KMar 7, 2025
Trade history
Every open→close lifecycle across tracked funds| Fund | Open date | Close date | Open price | Close price / current | Return |
|---|---|---|---|---|---|
| D.E. Shaw | Q2 2026 | open | $23 | $23 | +1% |
| Maverick Capital | Q2 2026 | open | $23 | $23 | +2% |
| Bridgewater Associates | Q1 2026 | open | $31 | $23 | -25% |
| Soros Fund Management | Q1 2026 | open | $31 | $23 | -25% |
| AQR Capital Management | Q3 2025 | open | $25 | $23 | -8% |
| Point72 Asset Management | Q3 2025 | open | $25 | $23 | -8% |
| Two Sigma Investments | Q2 2025 | open | $22 | $23 | +8% |
| Citadel Advisors | Q4 2024 | open | $26 | $23 | -12% |
| Soros Fund Management | Q4 2024 | Q1 2025 | $26 | $20 | -25% |
| Two Sigma Investments | Q4 2024 | Q1 2025 | $26 | $20 | -25% |
| D.E. Shaw | Q4 2024 | Q2 2025 | $26 | $22 | -18% |
| AQR Capital Management | Q4 2024 | Q2 2025 | $26 | $22 | -18% |
| Millennium Management | Q4 2024 | open | $26 | $23 | -12% |
| Point72 Asset Management | Q4 2024 | Q2 2025 | $26 | $22 | -18% |
| Renaissance Technologies | Q4 2024 | Q3 2025 | $30 | $27 | -10% |
| Bridgewater Associates | Q4 2024 | Q1 2025 | $30 | $20 | -33% |
- Covers only the 27 marquee funds tracked here, not the full institutional universe. A “0 holders” reading does not mean unowned.
- Heavy funds (Renaissance Technologies, Citadel Advisors, Soros Fund Management, Two Sigma Investments, D.E. Shaw, AQR Capital Management, Millennium Management, Point72 Asset Management) use 8-quarter snapshots, so their pre-2024 history is missing.
- “Current” reflects each fund's most recent 13F — filings lag the actual trade by up to 45 days; positions shown may have changed since.
- Cost = price at the entry filing date. Re-entered positions show the most recent open lot.
- Options, ADRs, and unmapped CUSIPs are excluded from the follower-backtest pipeline that produces these snapshots, so certain holding types won't appear here.