Amphastar Pharmaceuticals, Inc. (AMPH) ownership: Top institutional holder: BlackRock, Inc. ($106.20M). Insider activity: Net Seller (1 buys, 19 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| BlackRock, Inc. | 5421343.00 | $106.20M | 2026-03-31 |
| BlackRock Fund Advisors | 3900323.00 | $71.84M | 2016-12-31 |
| VANGUARD GROUP INC | 2608158.00 | $69.85M | 2025-12-31 |
| DIMENSIONAL FUND ADVISORS LP | 2027947.00 | $39.73M | 2026-03-31 |
| STATE STREET CORP | 1607515.00 | $31.49M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 1543655.00 | $30.24M | 2026-03-31 |
| TD Asset Management Inc | 1541044.00 | $30.19M | 2026-03-31 |
| FULLER & THALER ASSET MANAGEMENT, INC. | 1395139.00 | $27.33M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Buy | null | 2026-06-02 | |
| Sell | null | 2026-06-01 | |
| Sell | null | 2026-06-01 | |
| Sell | null | 2026-06-01 | |
| Sell | null | 2026-06-01 | |
| Sell | null | 2026-06-01 | |
| Sell | null | 2026-06-01 | |
| Sell | null | 2026-06-01 |
Back to AMPH overview · AMPH earnings · All congressional trades
Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.