Stocktoria
Amphastar Pharmaceuticals, Inc. AMPH
Amphastar Pharmaceuticals, Inc. institutional holders
| Investor | Shares | Value | % of company |
|---|---|---|---|
| BlackRock Finance, Inc. | 5,942,524 | $237.7M | 12.33% |
| D. E. Shaw & Co., Inc. | 665,542 | $13.0M | 1.38% |
| RENAISSANCE TECHNOLOGIES LLC | 553,900 | $10.9M | 1.15% |
| MILLENNIUM MANAGEMENT LLC | 371,373 | $7.3M | 0.77% |
| TWO SIGMA INVESTMENTS, LP | 138,148 | $2.7M | 0.29% |
| CITADEL ADVISORS LLC | 85,440 | $1.7M | 0.18% |
| AQR CAPITAL MANAGEMENT LLC | 78,778 | $1.5M | 0.16% |
% of company = reported institutional shares ÷ shares outstanding. Based on the latest reports; not every holder reports every quarter.
Computed from company filings · US · as of 2025-12-31. Facts plus Stocktoria's own computed scores — not investment advice.