Amphastar PharmaceuticalsAMPH
13F holders, Q4 2025 (December 31)236holders −7
22new positions
32sold out
6famous investors
$26.79avg. 13F price*
At the end of Q4 2025, 236 institutions reported holding Amphastar Pharmaceuticals Inc. (AMPH) in their 13F filings, down 7 from Q3 2025. 22 opened new positions and 32 sold out. The largest holders were BlackRock, Inc. ($146.3M), Vanguard Group Inc. ($69.8M) and TD Asset Management Inc ($52.6M). 6 famous investors held it, including Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio), David E. Shaw (0.0% of D. E. Shaw & Co.'s portfolio) and Israel Englander (0.0% of Millennium Management's portfolio).
- Company
- Amphastar Pharmaceuticals Inc.
- CUSIP
- 03209R103
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q3 2025 → Q4 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 22 | $15.4M |
| Exits | 32 | $10.7M |
All 13F filers, Q3 2025 → Q4 2025: 3,290,164 shares bought and 2,458,254 shares sold, net +831,910 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 236 holders
| BlackRock, Inc. | 0.00% | Reduce -0.4% | 5,462,015 | $146.3M |
| Vanguard Group Inc. | 0.00% | Reduce -0.9% | 2,608,158 | $69.8M |
| TD Asset Management Inc | 0.04% | Add +1.6% | 1,963,052 | $52.6M |
| Dimensional Fund Advisors LP | 0.01% | Add +2.5% | 1,799,685 | $48.2M |
| State Street Corp. | 0.00% | Add +2.1% | 1,531,786 | $41.0M |
| Fuller & Thaler Asset Management, Inc. | 0.13% | Add +3.0% | 1,394,463 | $37.3M |
| Marshall Wace, LLP | 0.03% | Add +41.5% | 1,237,284 | $33.1M |
| Epoch Investment Partners, Inc. | 0.17% | Reduce -0.7% | 1,126,585 | $30.2M |
| Boston Trust Walden Corp | 0.22% | Reduce -7.3% | 1,087,266 | $29.1M |
| Geode Capital Management, LLC | 0.00% | Reduce -3.9% | 886,825 | $23.8M |
| American Century Companies Inc. | 0.01% | Add +130.6% | 665,336 | $17.8M |
| Morgan Stanley | 0.00% | Add +3.0% | 591,631 | $15.8M |
| Arrowstreet Capital, Limited Partnership | 0.01% | Add +42.6% | 559,426 | $15.0M |
| D. E. Shaw & Co. | 0.01% | Add +7.7% | 557,066 | $14.9M |
| Goldman Sachs Group Inc. | 0.00% | Add +130.8% | 556,709 | $14.9M |
| Renaissance Technologies | 0.02% | Reduce -7.2% | 544,700 | $14.6M |
| Invesco Ltd. | 0.00% | Add +28.7% | 501,404 | $13.4M |
| Systematic Financial Management LP | 0.28% | Add +3.0% | 435,580 | $11.7M |
| Hotchkis & Wiley Capital Management LLC | 0.03% | Add +23.4% | 402,563 | $10.8M |
| Northern Trust Corp. | 0.00% | Reduce -7.0% | 371,391 | $9.9M |
| Royce & Associates LP | 0.10% | Reduce -3.8% | 352,297 | $9.4M |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -1.6% | 350,707 | $9.4M |
| Bridgeway Capital Management, LLC | 0.18% | Add +3.6% | 323,549 | $8.7M |
| Clark Capital Management Group, Inc. | 0.05% | Add +11.9% | 317,482 | $8.5M |
| Victory Capital Management Inc. | 0.00% | Add +44.1% | 305,161 | $8.2M |
| Millennium Management | 0.01% | Reduce -58.3% | 290,673 | $7.8M |
| Bank of New York Mellon Corp | 0.00% | Reduce -3.3% | 259,061 | $6.9M |
| UBS Group AG | 0.00% | Reduce -17.8% | 256,624 | $6.9M |
| Bridge City Capital, LLC | 1.85% | Add +72.8% | 235,485 | $6.3M |
| Voloridge Investment Management, LLC | 0.02% | Reduce -20.9% | 231,305 | $6.2M |
| Citadel Advisors | 0.00% | Add +0.9% | 228,724 | $6.1M |
| Principal Financial Group Inc. | 0.00% | Add +6.0% | 217,974 | $5.8M |
| Jane Street Group, LLC | 0.01% | Add +46.5% | 217,537 | $5.8M |
| Denali Advisors LLC | 0.63% | Add +56.9% | 211,765 | $5.7M |
| Pacer Advisors, Inc. | 0.01% | Add +2864.4% | 177,744 | $4.8M |
| Empowered Funds, LLC | 0.08% | Add +10.8% | 165,907 | $4.4M |
| JPMorgan Chase & Co. | 0.00% | Reduce -37.4% | 158,644 | $4.2M |
| First Trust Advisors LP | 0.00% | Reduce -6.7% | 140,310 | $3.8M |
| Ameriprise Financial Inc. | 0.00% | Add +3.0% | 133,715 | $3.6M |
| Lam Group, Inc. | 2.00% | No change | 130,800 | $3.5M |
| Nordea Investment Management AB | 0.00% | Reduce -15.8% | 129,144 | $3.5M |
| Bank of America Corp. | 0.00% | Add +0.8% | 128,174 | $3.4M |
| New York State Common Retirement Fund | 0.00% | Add +39.7% | 125,968 | $3.4M |
| Algert Global LLC | 0.05% | Reduce -68.2% | 125,130 | $3.4M |
| Public Sector Pension Investment Board | 0.01% | Reduce -12.3% | 122,505 | $3.3M |
| Rice Hall James & Associates, LLC | 0.18% | Reduce -6.3% | 121,176 | $3.2M |
| Bessemer Group Inc. | 0.01% | Add +84438.5% | 120,890 | $3.2M |
| BNP Paribas Financial Markets | 0.00% | Reduce -45.5% | 120,893 | $3.2M |
| Trexquant Investment LP | 0.03% | New | 113,673 | $3.0M |
| Qube Research & Technologies Ltd | 0.00% | Reduce -53.8% | 111,439 | $3.0M |
| LSV Asset Management | 0.01% | Add +50.5% | 110,300 | $3.0M |
| Brandywine Global Investment Management, LLC | 0.02% | New | 105,417 | $2.8M |
| Two Sigma Investments, LP | 0.00% | No change | 98,678 | $2.6M |
| SG Americas Securities, LLC | 0.00% | New | 93,515 | $2.5M |
| Quantedge Capital Pte Ltd | 1.17% | Add +103.3% | 91,700 | $2.5M |
| Legal & General Group Plc | 0.00% | Reduce -7.0% | 90,730 | $2.4M |
| O'shaughnessy Asset Management, LLC | 0.01% | Add +26.3% | 87,183 | $2.3M |
| Raymond James Financial Inc. | 0.00% | Reduce -28.5% | 84,454 | $2.3M |
| Rhumbline Advisers | 0.00% | Reduce -8.6% | 82,390 | $2.2M |
| Balyasny Asset Management L.P. | 0.00% | Reduce -45.4% | 77,467 | $2.1M |
| Nuveen, LLC | 0.00% | Reduce -2.1% | 76,101 | $2.0M |
| Barclays PLC | 0.00% | Add +13.3% | 75,319 | $2.0M |
| Swiss National Bank | 0.00% | No change | 72,600 | $1.9M |
| AQR Capital Management | 0.00% | Add +8.9% | 67,652 | $1.8M |
| Susquehanna Portfolio Strategies, LLC | 0.03% | Add +69.3% | 66,969 | $1.8M |
| CX Institutional | 0.05% | Add +1.3% | 64,123 | $1.7M |
| Intech Investment Management LLC | 0.02% | Add +23.6% | 63,232 | $1.7M |
| Cibc World Market Inc. | 0.00% | New | 62,192 | $1.7M |
| Alliancebernstein L.P. | 0.00% | Add +19.8% | 60,630 | $1.6M |
| SteelPeak Wealth, LLC | 0.05% | No change | 55,695 | $1.5M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Add +1.6% | 55,232 | $1.5M |
| Assetmark, Inc. | 0.00% | Reduce -3.8% | 54,359 | $1.5M |
| Creative Planning | 0.00% | Reduce -6.3% | 51,664 | $1.4M |
| XTX Topco Ltd | 0.03% | New | 48,607 | $1.3M |
| Prudential Financial Inc. | 0.00% | Reduce -0.5% | 47,203 | $1.3M |
| Wells Fargo & Company | 0.00% | Add +57.6% | 45,302 | $1.2M |
| SummerHaven Investment Management, LLC | 0.58% | No change | 38,200 | $1.0M |
| T. Rowe Price Associates Inc. | 0.00% | Reduce -86.6% | 36,796 | $986K |
| California State Teachers Retirement System | 0.00% | Reduce -0.2% | 35,798 | $959K |
| Polaris Capital Management, LLC | 0.08% | Add +171.2% | 35,532 | $952K |
| DekaBank Deutsche Girozentrale | 0.00% | No change | 20,848 | $951K |
| Campbell & CO Investment Adviser LLC | 0.04% | Reduce -30.4% | 30,682 | $822K |
| CANADA LIFE ASSURANCE Co | 0.00% | No change | 30,216 | $809K |
| Canada Pension Plan Investment Board | 0.00% | Add +44.0% | 29,800 | $798K |
| Deutsche Bank AG | 0.00% | Add +4.1% | 29,557 | $792K |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 0.00% | New | 29,104 | $785K |
| Envestnet Asset Management Inc. | 0.00% | Add +31.2% | 28,823 | $772K |
| Illumine Investment Management, LLC | 0.55% | Add +2.4% | 28,328 | $759K |
| Citigroup Inc. | 0.00% | Add +42.7% | 28,280 | $757K |
| State of Alaska, Department of Revenue | 0.01% | Add +34.3% | 27,916 | $747K |
| Gotham Asset Management | 0.00% | Add +81.0% | 27,802 | $745K |
| Freestone Grove Partners LP | 0.01% | New | 27,593 | $739K |
| Legato Capital Management LLC | 0.06% | Reduce -26.3% | 26,590 | $712K |
| Arkadios Wealth Advisors | 0.01% | Reduce -26.9% | 26,303 | $704K |
| Franklin Resources Inc. | 0.00% | Add +173.4% | 26,045 | $697K |
| Advisor OS, LLC | 0.05% | No change | 25,405 | $680K |
| Thrivent Financial for Lutherans | 0.00% | Reduce -5.9% | 24,313 | $651K |
| Federated Hermes, Inc. | 0.00% | New | 23,537 | $630K |
| New York State Teachers Retirement System | 0.00% | Reduce -1.5% | 22,977 | $615K |
| MetLife Investment Management, LLC | 0.00% | Reduce -8.7% | 21,075 | $564K |
"% of holder's portfolio" is AMPH's weight in each manager's 13F, not the share of Amphastar Pharmaceuticals Inc. the manager owns.