AMTM — Amentum Holdings Inc Institutional Holders · Q3 2026
Who owns Amentum Holdings Inc (AMTM)? 19 institutions reported holding $30.73M in SEC 13F filings for Q3 2026 (period ended 2026-09-30). Largest holders: Cacti Asset Management LLC ($15.9M), Segra Capital Management, LLC ($14.0M), Neville Rodie & Shaw Inc ($389,000).
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | CACTI ASSET MANAGEMENT LLC | $15.9M | 875,097 | Trimmed |
| 2 | SEGRA CAPITAL MANAGEMENT, LLC | $14.0M | 774,867 | Trimmed |
| 3 | NEVILLE RODIE & SHAW INC | $389,000 | 21,464 | Trimmed |
| 4 | CX Institutional | $141,000 | 7,771 | Added |
| 5 | TOTH FINANCIAL ADVISORY CORP | $127,203 | 7,020 | Trimmed |
| 6 | GAMMA Investing LLC | $82,790 | 4,569 | Trimmed |
| 7 | Farther Finance Advisors, LLC | $45,028 | 2,485 | Trimmed |
| 8 | CoreCap Advisors, LLC | $6,777 | 374 | Added |
| 9 | ELEVATION WEALTH PARTNERS, LLC | $3,570 | 197 | Trimmed |
| 10 | Versant Capital Management, Inc | $3,153 | 174 | Added |
| 11 | Roxbury Financial LLC | $2,138 | 118 | Hold |
| 12 | MassMutual Private Wealth & Trust, FSB | $1,975 | 109 | Hold |
| 13 | Grove Bank & Trust | $1,957 | 108 | Hold |
| 14 | Rosenberg Matthew Hamilton | $1,794 | 99 | Hold |
| 15 | GILPIN WEALTH MANAGEMENT, LLC | $1,559 | 86 | Added |
| 16 | GK Wealth Management LLC | $525 | 29 | New |
| 17 | Marquette Asset Management, LLC | $453 | 25 | New |
| 18 | EASTERN BANK | $362 | 20 | Hold |
| 19 | Davis Capital Management | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-09-30