# AMENTUM HOLDINGS INC (AMTM)

> Institutional ownership reported to the SEC as of Q3 2026, from Form 13F filings. Source: https://holderbook.com/stocks/AMTM/

- Reporting holders: 16
- Reported value: $30.2M
- Held through calls: 0.0%
- Held through puts: 0.0%

A 13F reports long US equity positions only. Shorts, bonds, foreign listings and cash are not visible here, and positions are disclosed up to 45 days after the quarter ends.

## Largest holders

| Manager | Value | Shares | Share of their book | Quarters held |
|---|---|---|---|---|
| [CACTI ASSET MANAGEMENT LLC](https://holderbook.com/funds/1452208-cacti-asset-management-llc/) | $15.9M | 875,097 | 0.8% | 8 |
| [SEGRA CAPITAL MANAGEMENT, LLC](https://holderbook.com/funds/1607512-segra-capital-management-llc/) | $14.0M | 774,867 | 1.4% | 5 |
| [TOTH FINANCIAL ADVISORY CORP](https://holderbook.com/funds/866780-toth-financial-advisory-corp/) | $127.2K | 7,020 | 0.0% | 9 |
| [GAMMA Investing LLC](https://holderbook.com/funds/2010235-gamma-investing-llc/) | $82.8K | 4,569 | 0.0% | 9 |
| [Farther Finance Advisors, LLC](https://holderbook.com/funds/1992825-farther-finance-advisors-llc/) | $45.0K | 2,485 | 0.0% | 8 |
| [CoreCap Advisors, LLC](https://holderbook.com/funds/1902501-corecap-advisors-llc/) | $6.8K | 374 | 0.0% | 8 |
| [ELEVATION WEALTH PARTNERS, LLC](https://holderbook.com/funds/1976256-elevation-wealth-partners-llc/) | $3.6K | 197 | 0.0% | 2 |
| [Versant Capital Management, Inc](https://holderbook.com/funds/1735057-versant-capital-management-inc/) | $3.2K | 174 | 0.0% | 8 |
| [Roxbury Financial LLC](https://holderbook.com/funds/2054149-roxbury-financial-llc/) | $2.1K | 118 | 0.0% | 8 |
| [MassMutual Private Wealth & Trust, FSB](https://holderbook.com/funds/1103653-massmutual-private-wealth-trust-fsb/) | $2.0K | 109 | 0.0% | 9 |
| [Grove Bank & Trust](https://holderbook.com/funds/1662212-grove-bank-trust/) | $2.0K | 108 | 0.0% | 8 |
| [Rosenberg Matthew Hamilton](https://holderbook.com/funds/1812103-rosenberg-matthew-hamilton/) | $1.8K | 99 | 0.0% | 9 |
| [GILPIN WEALTH MANAGEMENT, LLC](https://holderbook.com/funds/2058144-gilpin-wealth-management-llc/) | $1.6K | 86 | 0.0% | 4 |
| [GK Wealth Management LLC](https://holderbook.com/funds/2069222-gk-wealth-management-llc/) | $525 | 29 | 0.0% | 1 |
| [Marquette Asset Management, LLC](https://holderbook.com/funds/1395067-marquette-asset-management-llc/) | $453 | 25 | 0.0% | 1 |
| [NEVILLE RODIE & SHAW INC](https://holderbook.com/funds/71210-neville-rodie-shaw-inc/) | $389 | 21,464 | 0.0% | 9 |
| [EASTERN BANK](https://holderbook.com/funds/1126395-eastern-bank/) | $362 | 20 | 0.0% | 9 |
| [CX Institutional](https://holderbook.com/funds/1737089-cx-institutional/) | $141 | 7,771 | 0.0% | 7 |

## Quarter by quarter

| Quarter | Holders | Reported value |
|---|---|---|
| Q3 2026 | 16 | $30.2M |
| Q2 2026 | 466 | $3.7B |
| Q1 2026 | 488 | $5.5B |
| Q4 2025 | 487 | $5.8B |
| Q3 2025 | 463 | $4.7B |
| Q2 2025 | 465 | $4.8B |
| Q1 2025 | 420 | $3.6B |
| Q4 2024 | 452 | $3.6B |
| Q3 2024 | 489 | $3.3B |