7 institutions reported holding $351,492 of AMPHASTAR PHARMACEUTICALS IN (AMPH) in SEC 13F filings for 2026-06-30. Largest institutional holders: Assenagon Asset Management S.A. ($307,059), CX Institutional ($25,000), MassMutual Private Wealth & Trust, FSB ($8,738), GAMMA Investing LLC ($6,296), Versant Capital Management, Inc ($4,399). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | Assenagon Asset Management S.A. | $307,059 | 15,216 | Hold |
| 2 | CX Institutional | $25,000 | 1,259 | Trimmed |
| 3 | MassMutual Private Wealth & Trust, FSB | $8,738 | 433 | Added |
| 4 | GAMMA Investing LLC | $6,296 | 312 | Trimmed |
| 5 | Versant Capital Management, Inc | $4,399 | 218 | Hold |
| 6 | Cedar Mountain Advisors, LLC | $0 | 0 | Exited |
| 7 | CoreCap Advisors, LLC | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-06-30