Amphastar Pharmaceuticals, Inc. (AMPH) ownership: insiders 5% · institutions 65% · index and ETF funds 12% (13F 2026-03-31). Insider activity, 90 days: 2 sales, 0 open-market buys. SEC EDGAR first-party data.
| Holder | Shares | Market Value | % Outstanding | Reported |
|---|---|---|---|---|
| BlackRock | 5421343.00 | $106.20M | 12.3% | 2026-03-31 |
| Vanguard | 2655473.00 | $52.02M | 6.0% | 2026-03-31 |
| Dimensional Fund Advisors | 2027947.00 | $39.73M | 4.6% | 2026-03-31 |
| State Street | 1607515.00 | $31.49M | 3.6% | 2026-03-31 |
| TD Asset Management | 1541044.00 | $30.19M | 3.5% | 2026-03-31 |
| Fuller & Thaler Asset Management, Inc. | 1395139.00 | $27.33M | 3.2% | 2026-03-31 |
| Marshall Wace | 1025640.00 | $20.09M | 2.3% | 2026-03-31 |
| American Century | 1017538.00 | $19.93M | 2.3% | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-08-11 | |
| Sell | null | 2026-08-07 | |
| Sell | null | 2026-08-07 | |
| Sell | null | 2026-08-07 | |
| Sell | null | 2026-07-09 | |
| Sell | null | 2026-07-09 | |
| Buy | null | 2026-06-02 | |
| Sell | null | 2026-06-01 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.