Who Owns Amentum Holdings Inc
Every manager with more than $100m in listed equities files a 13F each quarter naming what they hold. These are the ones reporting a position in Amentum Holdings Inc.
Who crossed 5% of AMTM →Positions as of 2026-09-30
Largest first. The move is against the previous quarter that manager filed, not the previous calendar quarter.
| Manager | Value |
|---|---|
| SEGRA CAPITAL MANAGEMENT, LLCCOM774.9K shtrimmed | $14M |
| NEVILLE RODIE & SHAW INCCOM21.5K shtrimmed | $389K |
| TOTH FINANCIAL ADVISORY CORPCOM7K shtrimmed | $127.2K |
| GAMMA Investing LLCCommon Stock4.6K shtrimmed | $82.8K |
| Farther Finance Advisors, LLCStock2.5K shtrimmed | $45K |
| CoreCap Advisors, LLCStock374 shadded | $6.8K |
| ELEVATION WEALTH PARTNERS, LLCCOM197 shtrimmed | $3.6K |
| MassMutual Private Wealth & Trust, FSBCommon / Ordinary Stock109 shheld | $2K |
| Grove Bank & TrustCOM108 shheld | $2K |
| Rosenberg Matthew HamiltonStock99 shheld | $1.8K |
| GILPIN WEALTH MANAGEMENT, LLCCOM86 shadded | $1.6K |
| GK Wealth Management LLCCOM29 sh— | $525 |
| Marquette Asset Management, LLCCOM25 sh— | $453 |
| EASTERN BANKCOM20 shheld | $362 |
Source: quarterly 13F filings, via EDGAR. A 13F reports positions by CUSIP alone; each CUSIP here has been confirmed against OpenFIGI rather than matched by name, because a name match would attribute one company's shareholders to another. Positions are as of quarter end and can be months old by the time they are filed, and 13F covers long equity positions only — not shorts, and not most debt. The summed value is what these filers reported, not the company's institutional ownership.
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