AMPH: Amphastar Pharmaceuticals In insider trading, 5% holders and institutional ownership
From public SEC filings: open-market insider purchases and sales (Form 4, last 180 days), holders of 5% or more (Schedules 13D and 13G) and institutional ownership (Form 13F). Insider and 5% data delayed 48 hours.
Insider trading
0 open-market buys totaling - and 0 sales totaling - in the last 180 days.
Institutional ownership (Q2 2026)
212 institutions reported holding $539.51M of Amphastar Pharmaceuticals In on Form 13F (215 the quarter before). 29 opened a new position and 32 sold out. Shares held by institutions: -12%.
| Largest holders | Shares | Value |
|---|---|---|
| BlackRock, Inc. | 5,224,934 | $105.44M |
| DIMENSIONAL FUND ADVISORS LP | 2,305,107 | $46.52M |
| STATE STREET CORP | 1,642,126 | $33.14M |
| VANGUARD CAPITAL MANAGEMENT LLC | 1,481,952 | $29.91M |
| AMERICAN CENTURY COMPANIES INC | 1,176,626 | $23.74M |
| MARSHALL WACE, LLP | 1,066,322 | $21.52M |
| GEODE CAPITAL MANAGEMENT, LLC | 969,840 | $19.58M |
| FULLER & THALER ASSET MANAGEMENT, INC. | 949,238 | $19.16M |
| D. E. Shaw & Co., Inc. | 887,048 | $17.90M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 809,568 | $16.34M |
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