AMTM
Amentum Holdings, Inc. · Industrials · Aerospace & Defense
Momentum inputs (comparable managers):
holder breadth -23.1% ·
share flow +25.4% ·
net new positions -20.0%
— formula
Concentrated accumulation — rising shares among fewer holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q1 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 109 | -3 | 117.16M | $2.42B | +7 | −9 |
| Q1 2026 | 114 | +1 | 111.17M | $2.90B | +6 | −6 |
| Q4 2025 | 114 | +3 | 114.62M | $3.32B | +4 | — |
| Q3 2025 | 18 | 0 | 67.20M | $1.61B | +1 | −2 |
| Q2 2025 | 16 | +3 | 69.96M | $1.65B | +4 | −1 |
| Q1 2025 | 10 | -3 | 25.91M | $471.64M | +2 | −5 |
| Q4 2024 | 13 | -2 | 20.67M | $434.75M | +2 | −4 |
| Q3 2024 | 14 | +14 | 12.37M | $393.08M | +14 | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | PRIMECAP Management ✦ | 10.06M | +56.9% | $183.12M | 0.2% | ▲ Add | 3 | SEC ↗ |
| 2 | State Street Global Advisors ✦ (passive) | 6.58M | +1.9% | $119.69M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 3 | Citadel Advisors ✦ | 2.93M | +641.2% | $53.26M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 4 | Citadel Advisors ✦ | 2.93M | +641.2% | $53.26M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 5 | Geode Capital Management ✦ (passive) | 2.30M | +17.1% | $41.87M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 6 | Geode Capital Management ✦ (passive) | 2.30M | +17.1% | $41.87M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 7 | Millennium Management ✦ | 2.01M | +68.1% | $36.61M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 8 | Norges Bank ✦ (passive) | 1.72M | +19.2% | $31.24M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 9 | Marshall Wace ✦ | 147.35K | New | $2.68M | 0.0% | New | 1 | SEC ↗ |
| 10 | Marshall Wace ✦ | 147.35K | New | $2.68M | 0.0% | New | 1 | SEC ↗ |
| 11 | T. Rowe Price ✦ | 88.10K | +41.8% | $1.60M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 12 | Two Sigma Investments ✦ | 54.10K | New | $984,620 | 0.0% | New | 1 | SEC ↗ |
| 13 | Renaissance Technologies ✦ | 31.40K | +185.4% | $571,480 | 0.0% | ▲ Add | 3 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Marshall Wace | $2.68M | 0.0% |
| Marshall Wace | $2.68M | 0.0% |
| Two Sigma Investments | $984,620 | 0.0% |
Exited
| Wellington Management | $49.07M | was 0.0% |
| Point72 Asset Management | $2.66M | was 0.0% |
| D. E. Shaw & Co. | $2.52M | was 0.0% |
| AQR Capital Management | $1.77M | was 0.0% |
| Arrowstreet Capital | $1.51M | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 482 holders, 210.87M shares, $5.10B reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.