Amphastar Pharmaceuticals, Inc.: which funds bought and sold
Institutions that bought and sold Amphastar Pharmaceuticals shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.
Between March 31, 2026 and June 30, 2026, 93 institutions that filed 13F reports for both quarters added to or opened positions in Amphastar Pharmaceuticals, and 108 cut or closed them. Together they sold a net 4.0M shares, −12.4% on what they held at the start of the quarter. Active managers and hedge funds on our list were net sellers of 229K shares (−3.4%); index fund managers were net sellers of 241K shares (−2.1%). 29 opened a new position and 34 sold out entirely.
Bought, Q2 2026 93 institutions, 29 of them new holders Sold, Q2 2026 108 institutions, 34 of them sold out
Net change, all compared −4.0M shares (−12.4%)
Net change, active managers −229K shares (−3.4%), 17 bought, 18 sold
Buyers versus sellers
93 bought 36 108 sold
Active managers and hedge funds 17 bought · 18 sold · −229K
Index fund managers 2 bought · 8 sold · −241K
Other institutions 74 bought · 82 sold · −3.6M
Biggest buyers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| HRT Financial LP | +331K +589.8% | 388K | $7.8M |
| Dimensional Fund Advisors LP | +277K +13.7% | 2.3M | $46.5M |
| D. E. Shaw & Co., Inc. Hedge fund | +222K +33.3% | 887K | $17.9M |
| Goldman Sachs Group Inc | +176K +53.4% | 505K | $10.2M |
| American Century Companies Inc Active manager | +159K +15.6% | 1.2M | $23.7M |
| AQR Capital Management LLC Hedge fund | +130K +164.9% | 209K | $4.2M |
| Two Sigma Investments, LP Hedge fund | +110K +79.6% | 248K | $5M |
| Denali Advisors LLC | +110K +41.1% | 376K | $7.6M |
| First Trust Advisors LP | +96K +64.0% | 247K | $5M |
| Jane Street Group, LLC | +86K +93.3% | 179K | $3.6M |
| Algert Global LLC Hedge fund | +69K +110.7% | 131K | $2.7M |
| Jump Financial, LLC | +57K New position | 57K | $1.1M |
| O'Shaughnessy Asset Management, LLC Active manager | +55K +53.4% | 159K | $3.2M |
| Point72 Asset Management, L.P. Hedge fund | +55K New position | 55K | $1.1M |
| Squarepoint Ops LLC Hedge fund | +50K +178.0% | 79K | $1.6M |
| Marshall Wace, LLP Hedge fund | +41K +4.0% | 1.1M | $21.5M |
| Vanguard Global Advisers, LLC | +37K +74.7% | 88K | $1.8M |
| Susquehanna International Group, LLP | +36K +246.3% | 51K | $1M |
| Creative Planning | +35K +213.6% | 51K | $1M |
| Y-Intercept (Hong Kong) Ltd | +35K New position | 35K | $700,327 |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| D. E. Shaw & Co., Inc. Hedge fund | +222K +33.3% | 887K | $17.9M |
| American Century Companies Inc Active manager | +159K +15.6% | 1.2M | $23.7M |
| AQR Capital Management LLC Hedge fund | +130K +164.9% | 209K | $4.2M |
| Two Sigma Investments, LP Hedge fund | +110K +79.6% | 248K | $5M |
| Algert Global LLC Hedge fund | +69K +110.7% | 131K | $2.7M |
| O'Shaughnessy Asset Management, LLC Active manager | +55K +53.4% | 159K | $3.2M |
| Point72 Asset Management, L.P. Hedge fund | +55K New position | 55K | $1.1M |
| Squarepoint Ops LLC Hedge fund | +50K +178.0% | 79K | $1.6M |
| Marshall Wace, LLP Hedge fund | +41K +4.0% | 1.1M | $21.5M |
| Engineers Gate Manager LP Hedge fund | +30K New position | 30K | $609,254 |
Biggest sellers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| TD Asset Management Inc | −1.5M Sold out | 0 | — |
| Boston Trust Walden Corp | −945K Sold out | 0 | — |
| Epoch Investment Partners, Inc. | −899K Sold out | 0 | — |
| Invesco Ltd. | −447K −73.9% | 158K | $3.2M |
| Fuller & Thaler Asset Management, Inc. | −446K −32.0% | 949K | $19.2M |
| Millennium Management LLC Hedge fund | −340K −91.4% | 32K | $642,007 |
| Arrowstreet Capital, Limited Partnership Hedge fund | −209K −64.1% | 117K | $2.4M |
| Blackrock, Inc. Index funds | −196K −3.6% | 5.2M | $105M |
| Rice Hall James & Associates, LLC | −187K Sold out | 0 | — |
| Voloridge Investment Management, LLC Hedge fund | −120K −70.3% | 51K | $1M |
| Franklin Resources Inc Active manager | −114K −82.1% | 25K | $504,218 |
| Royce & Associates LP Active manager | −111K −27.4% | 295K | $5.9M |
| BNP Paribas Financial Markets | −101K −65.0% | 55K | $1.1M |
| Victory Capital Management Inc Active manager | −100K −40.1% | 150K | $3M |
| Hussman Strategic Advisors, Inc. | −63K Sold out | 0 | — |
| Vanguard Capital Management LLC Index funds | −62K −4.0% | 1.5M | $29.9M |
| Citadel Advisors LLC Hedge fund | −49K −75.2% | 16K | $327,542 |
| Trexquant Investment LP Hedge fund | −48K Sold out | 0 | — |
| Jpmorgan Chase & Co | −47K −45.0% | 58K | $1.2M |
| Xtx Topco Ltd | −41K −46.6% | 47K | $944,585 |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Millennium Management LLC Hedge fund | −340K −91.4% | 32K | $642,007 |
| Arrowstreet Capital, Limited Partnership Hedge fund | −209K −64.1% | 117K | $2.4M |
| Voloridge Investment Management, LLC Hedge fund | −120K −70.3% | 51K | $1M |
| Franklin Resources Inc Active manager | −114K −82.1% | 25K | $504,218 |
| Royce & Associates LP Active manager | −111K −27.4% | 295K | $5.9M |
| Victory Capital Management Inc Active manager | −100K −40.1% | 150K | $3M |
| Citadel Advisors LLC Hedge fund | −49K −75.2% | 16K | $327,542 |
| Trexquant Investment LP Hedge fund | −48K Sold out | 0 | — |
| Bridgeway Capital Management, LLC Active manager | −32K −9.5% | 299K | $6M |
| Freestone Grove Partners LP Hedge fund | −30K Sold out | 0 | — |
New positions
| Institution | Shares | Value June 30, 2026 |
|---|---|---|
| Jump Financial, LLC | 57K | $1.1M |
| Point72 Asset Management, L.P.Hedge fund | 55K | $1.1M |
| Y-Intercept (Hong Kong) Ltd | 35K | $700,327 |
| Engineers Gate Manager LPHedge fund | 30K | $609,254 |
| Campbell & Co Investment Adviser LLC | 23K | $468,398 |
| Quantinno Capital Management LP | 21K | $420,289 |
| Fox Run Management, L.L.C. | 15K | $293,740 |
| Jain Global LLCHedge fund | 14K | $286,213 |
| Allstate Corp | 11K | $229,104 |
| Significant Wealth Partners LLC | 10K | $210,356 |
Sold out
| Institution | Shares | Value March 31, 2026 |
|---|---|---|
| TD Asset Management Inc | 1.5M | $30.2M |
| Boston Trust Walden Corp | 945K | $18.5M |
| Epoch Investment Partners, Inc. | 899K | $17.6M |
| Rice Hall James & Associates, LLC | 187K | $3.7M |
| Hussman Strategic Advisors, Inc. | 63K | $1.2M |
| Trexquant Investment LPHedge fund | 48K | $937,715 |
| HSBC Holdings PLC | 38K | $753,497 |
| Freestone Grove Partners LPHedge fund | 30K | $584,899 |
| Illumine Investment Management, LLC | 28K | $550,048 |
| Round Rock Advisors LLC | 20K | $401,497 |
Who holds the shares
- Institutions reporting
- 206
- Ten largest holders
- 58.4% of 13F-reported shares
- Index fund managers
- 39.3% of 13F-reported shares
- Active managers and hedge funds
- 23.1% of 13F-reported shares
| Type | Bought | Sold | New | Sold out | Net change in shares | Net % |
|---|---|---|---|---|---|---|
| Active managers and hedge funds | 17 | 18 | 5 | 4 | −229K | −3.4% |
| Index fund managers | 2 | 8 | 0 | 1 | −241K | −2.1% |
| Other institutions | 74 | 82 | 24 | 29 | −3.6M | −25.0% |
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