AMPH Amphastar Pharmaceuticals Inc.
Amphastar Pharmaceuticals Inc. (AMPH) Institutional Ownership
What the institutions did with AMPH last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
Sign in or subscribeLargest holders
| Manager | Shares | % of reported |
|---|---|---|
| BlackRock, Inc. | 5.2M | 18.5% |
| DIMENSIONAL FUND ADVISORS LP | 2.3M | 8.1% |
| STATE STREET CORP | 1.6M | 5.8% |
| VANGUARD CAPITAL MANAGEMENT LLC | 1.5M | 5.2% |
| AMERICAN CENTURY COMPANIES INC | 1.2M | 4.2% |
| MARSHALL WACE, LLP | 1.1M | 3.8% |
| GEODE CAPITAL MANAGEMENT, LLC | 969.8K | 3.4% |
| FULLER & THALER ASSET MANAGEMENT, INC. | 949.2K | 3.4% |
| D. E. Shaw & Co., Inc. | 887.0K | 3.1% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 809.6K | 2.9% |
| LSV ASSET MANAGEMENT | 642.0K | 2.3% |
| RENAISSANCE TECHNOLOGIES LLC | 525.1K | 1.9% |
| GOLDMAN SACHS GROUP INC | 505.4K | 1.8% |
| SYSTEMATIC FINANCIAL MANAGEMENT LP | 437.4K | 1.5% |
| MORGAN STANLEY | 434.8K | 1.5% |
| UBS Group AG | 393.1K | 1.4% |
| HRT FINANCIAL LP | 387.5K | 1.4% |
| DENALI ADVISORS LLC | 376.0K | 1.3% |
| NORTHERN TRUST CORP | 371.0K | 1.3% |
| Bridge City Capital, LLC | 338.7K | 1.2% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 310.2K | 1.1% |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 299.0K | 1.1% |
| ROYCE & ASSOCIATES LP | 294.8K | 1.0% |
| TWO SIGMA INVESTMENTS, LP | 248.1K | 0.9% |
| FIRST TRUST ADVISORS LP | 247.0K | 0.9% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| TD Asset Management Inc | Sold Out | 1.5M | 0 | -1.5M |
| Boston Trust Walden Corp | Sold Out | 944.8K | 0 | -944.8K |
| Epoch Investment Partners, Inc. | Sold Out | 898.9K | 0 | -898.9K |
| Invesco Ltd. | Reduced | 604.8K | 158.1K | -446.7K |
| FULLER & THALER ASSET MANAGEMENT, INC. | Reduced | 1.4M | 949.2K | -445.9K |
| MILLENNIUM MANAGEMENT LLC | Reduced | 371.4K | 31.8K | -339.6K |
| HRT FINANCIAL LP | Increased | 56.2K | 387.5K | +331.3K |
| DIMENSIONAL FUND ADVISORS LP | Increased | 2.0M | 2.3M | +277.2K |
| D. E. Shaw & Co., Inc. | Increased | 665.5K | 887.0K | +221.5K |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | Reduced | 325.3K | 116.7K | -208.6K |
| BlackRock, Inc. | Reduced | 5.4M | 5.2M | -196.4K |
| RICE HALL JAMES & ASSOCIATES, LLC | Sold Out | 187.3K | 0 | -187.3K |
| GOLDMAN SACHS GROUP INC | Increased | 329.4K | 505.4K | +176.0K |
| AMERICAN CENTURY COMPANIES INC | Increased | 1.0M | 1.2M | +159.1K |
| AQR CAPITAL MANAGEMENT LLC | Increased | 78.8K | 208.7K | +129.9K |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC | Reduced | 171.2K | 50.9K | -120.3K |
| FRANKLIN RESOURCES INC | Reduced | 139.3K | 25.0K | -114.3K |
| ROYCE & ASSOCIATES LP | Reduced | 406.2K | 294.8K | -111.4K |
| TWO SIGMA INVESTMENTS, LP | Increased | 138.1K | 248.1K | +110.0K |
| DENALI ADVISORS LLC | Increased | 266.5K | 376.0K | +109.5K |
| BNP PARIBAS FINANCIAL MARKETS | Reduced | 156.1K | 54.7K | -101.4K |
| VICTORY CAPITAL MANAGEMENT INC | Reduced | 249.6K | 149.6K | -100.0K |
| FIRST TRUST ADVISORS LP | Increased | 150.6K | 247.0K | +96.4K |
| JANE STREET GROUP, LLC | Increased | 92.5K | 178.7K | +86.3K |
| ALGERT GLOBAL LLC | Increased | 62.4K | 131.4K | +69.0K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.