17 institutions reported holding $20.5M of Amentum Holdings Inc (AMTM) in SEC 13F filings for 2026-06-30. Largest institutional holders: CACTI ASSET MANAGEMENT LLC ($18.2M), BDF-GESTION ($1.5M), NEVILLE RODIE & SHAW INC ($444,000), CX Institutional ($159,000), GAMMA Investing LLC ($102,482). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | CACTI ASSET MANAGEMENT LLC | $18.2M | 881,692 | Hold |
| 2 | BDF-GESTION | $1.5M | 676 | Trimmed |
| 3 | NEVILLE RODIE & SHAW INC | $444,000 | 21,486 | Trimmed |
| 4 | CX Institutional | $159,000 | 7,694 | Trimmed |
| 5 | GAMMA Investing LLC | $102,482 | 4,958 | Trimmed |
| 6 | CoreCap Advisors, LLC | $7,255 | 351 | Hold |
| 7 | ELEVATION WEALTH PARTNERS, LLC | $4,114 | 199 | New |
| 8 | Versant Capital Management, Inc | $3,535 | 171 | Trimmed |
| 9 | Roxbury Financial LLC | $2,439 | 118 | Hold |
| 10 | MassMutual Private Wealth & Trust, FSB | $2,253 | 109 | Trimmed |
| 11 | Grove Bank & Trust | $2,232 | 108 | Hold |
| 12 | HARBOR INVESTMENT ADVISORY, LLC | $2,191 | 106 | Hold |
| 13 | Kozak & Associates, Inc. | $889 | 44 | Hold |
| 14 | EASTERN BANK | $413 | 20 | Trimmed |
| 15 | Arlington Trust Co LLC | $227 | 11 | Trimmed |
| 16 | Hilltop National Bank | $0 | 0 | Exited |
| 17 | Global Wealth Strategies & Associates | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-06-30