Amentum Holdings, Inc. 13F holders
Of the 44 funds followed here, 10 reported a position in Amentum Holdings, Inc. in a 13F for the quarter ended 30 June 2026. The largest: FMR LLC, 5.7 million shares worth $117.4 million, 0.0% of its reported book.
| Fund | Shares | Value | Of its book | Change on the quarter | Status | Quarter ended | Filing |
|---|---|---|---|---|---|---|---|
| FMR LLC | 5,679,175 | $117.4 million | 0.0% | +100,789 | added | 30 June 2026 | 13F |
| Geode Capital Management | 2,716,560 | $56.2 million | 0.0% | -97,855 | trimmed | 30 June 2026 | 13F |
| Millennium Management | 2,127,779 | $44.0 million | 0.0% | +1,496,724 | added | 30 June 2026 | 13F |
| Norges Bank | 1,516,193 | $31.3 million | 0.0% | held | 30 June 2026 | 13F | |
| Permian Investment Partners | 1,433,028 | $29.6 million | 3.2% | -133,972 | trimmed | 30 June 2026 | 13F |
| Citadel Advisors | 974,284 | $20.1 million | 0.0% | +467,446 | added | 30 June 2026 | 13F |
| Point72 Asset Management | 649,984 | $13.4 million | 0.0% | -980,579 | trimmed | 30 June 2026 | 13F |
| Two Sigma Investments | 284,268 | $5.9 million | 0.0% | -643,809 | trimmed | 30 June 2026 | 13F |
| Soros Fund Management | 118,276 | $2.4 million | 0.0% | +10,670 | added | 30 June 2026 | 13F |
| Bridgewater Associates | 47,223 | $976,099 | 0.0% | +30,171 | added | 30 June 2026 | 13F |
Value is what the fund reported.
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Change is shares against the fund's previous 13F; a fund with one filing read shows no change. 13Fs cover long US positions of managers above $100 million and are filed up to 45 days after the quarter.Schedule 13D and 13G filed on the name, last twelve months
| Filed | Schedule | Who | Holding | Of the class | Event date | Rule or purpose | Filing |
|---|---|---|---|---|---|---|---|
| 6 August 2026 | 13G | Primecap Management Co/Ca/ and 1 other | 12.3 million | 5.0% | 30 June 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 7 May 2026 | 13G/A | Invesco Ltd. and 1 other | 24.5 million | 10.1% | 30 April 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 26 March 2026 | 13G/A | The Vanguard Group and 1 other | 0 | 0.0% | 13 March 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 6 November 2025 | 13G/A | Invesco Ltd. and 1 other | 22.1 million | 9.1% | 30 September 2025 | passive, institutional (13d-1(b)) | EDGAR |
A Schedule 13D is filed by anyone who crosses 5% of a class with intent to influence; a 13G by a passive holder.
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Amendments (/A) report a change, including an exit to zero. Holding and percentage are as the filer stated them on the cover page; the purpose is the filer's own words, cut short.Fails to deliver
| Settlement date | Shares failed | Price | File |
|---|---|---|---|
| 11 September 2026 | 89 | $19.56 | SEC |
| 9 September 2026 | 6 | $20.14 | SEC |
| 8 September 2026 | 147 | $20.06 | SEC |
| 1 September 2026 | 398 | $19.99 | SEC |
| 26 August 2026 | 3,688 | $20.26 | SEC |
| 20 August 2026 | 49,601 | $21.03 | SEC |
| 13 August 2026 | 166 | $22.52 | SEC |
Shares that failed to deliver at settlement, per day, from the SEC's half-month files, which arrive about two weeks after the period.
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Largest in the window: 49,601 on 20 August 2026. A fail is an operational fact about settlement, not a position.Source
Each fund's 13F-HR on EDGAR, linked per row; positions matched to AMTM by CUSIP from the SEC's own fails-to-deliver files; Schedule 13D and 13G from the company's own filing index, each read to confirm the company is the issuer named.
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