Amphastar Pharmaceuticals, Inc.
AMPH- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001297184
In the last 90 days, Amphastar Pharmaceuticals, Inc. insiders filed 0 open-market purchases and 5 sales; 212 institutions reported holding it in 13F filings for Q2 2026, worth $572.1M in total; no superinvestor holds it.
13F holders, Q4 2025
Institutional positions in Amphastar Pharmaceuticals, Inc. as of Dec 31, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 236
- −6 vs. Q3 2025
- Shares held
- 33.6M
- +837.1K (+2.6%) vs. Q3 2025
- Total value
- $899.7M
- +$27.0M (+3.1%) vs. Q3 2025
- New holders
- 26
- 94 more added
- Sold out
- 32
- 87 more reduced
1 institution that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting AMPH on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 212 | $572.1M |
| Q1 2026 | 215 | $634.0M |
| Q4 2025 | 236 | $899.7M |
| Q3 2025 | 243 | $872.8M |
| Q2 2025 | 245 | $752.0M |
| Q1 2025 | 241 | $963.6M |
| Q4 2024 | 264 | $1.31B |
| Q3 2024 | 279 | $1.72B |
| Q2 2024 | 269 | $1.37B |
| Q1 2024 | 271 | $1.47B |
| Q4 2023 | 276 | $2.06B |
| Q3 2023 | 256 | $1.47B |
| Q2 2023 | 246 | $1.80B |
| Q1 2023 | 218 | $1.13B |
| Q4 2022 | 213 | $816.7M |
| Q3 2022 | 207 | $839.3M |
| Q2 2022 | 223 | $1.06B |
| Q1 2022 | 203 | $1.07B |
| Q4 2021 | 168 | $678.8M |
| Q3 2021 | 140 | $530.8M |
| Q2 2021 | 146 | $549.6M |
| Q1 2021 | 135 | $476.9M |
Institutions, Q4 2025
Shares, value and share of portfolio for each institution holding Amphastar Pharmaceuticals, Inc.; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| BlackRock, Inc. | 5,462,015 | $146.3M | 0.00% | −23,042−0.4% | Reduced |
| Vanguard Group Inc | 2,608,158 | $69.8M | 0.00% | −22,882−0.9% | Reduced |
| TD Asset Management Inc | 1,963,052 | $52.6M | 0.04% | +31,160+1.6% | Added |
| Dimensional Fund Advisors LP | 1,799,685 | $48.2M | 0.01% | +44,020+2.5% | Added |
| State Street Corp | 1,531,786 | $41.0M | 0.00% | +31,044+2.1% | Added |
| Fuller & Thaler Asset Management, Inc. | 1,394,463 | $37.3M | 0.13% | +40,536+3.0% | Added |
| Marshall Wace, LLP | 1,237,284 | $33.1M | 0.03% | +363,216+41.6% | Added |
| Epoch Investment Partners, Inc. | 1,126,585 | $30.2M | 0.17% | −7,401−0.7% | Reduced |
| Boston Trust Walden Corp | 1,087,266 | $29.1M | 0.22% | −85,841−7.3% | Reduced |
| Geode Capital Management, LLC | 886,825 | $23.8M | 0.00% | −35,752−3.9% | Reduced |
| American Century Companies Inc | 665,336 | $17.8M | 0.01% | +376,751+130.6% | Added |
| Morgan Stanley | 591,631 | $15.8M | 0.00% | +16,952+2.9% | Added |
| Arrowstreet Capital, Limited Partnership | 559,426 | $15.0M | 0.01% | +167,116+42.6% | Added |
| D. E. Shaw & Co., Inc. | 557,066 | $14.9M | 0.01% | +39,844+7.7% | Added |
| Goldman Sachs Group Inc | 556,709 | $14.9M | 0.00% | +315,481+130.8% | Added |
| Renaissance Technologies LLC | 544,700 | $14.6M | 0.02% | −42,200−7.2% | Reduced |
| Invesco Ltd. | 501,404 | $13.4M | 0.00% | +111,811+28.7% | Added |
| Systematic Financial Management LP | 435,580 | $11.7M | 0.27% | +12,468+2.9% | Added |
| Hotchkis & Wiley Capital Management LLC | 402,563 | $10.8M | 0.03% | +76,380+23.4% | Added |
| Northern Trust Corp | 371,391 | $9.95M | 0.00% | −28,079−7.0% | Reduced |
| Royce & Associates LP | 352,297 | $9.43M | 0.10% | −14,025−3.8% | Reduced |
| Charles Schwab Investment Management Inc | 350,707 | $9.39M | 0.00% | −5,702−1.6% | Reduced |
| Bridgeway Capital Management, LLC | 323,549 | $8.66M | 0.18% | +11,212+3.6% | Added |
| Clark Capital Management Group, Inc. | 317,482 | $8.50M | 0.05% | +33,808+11.9% | Added |
| Victory Capital Management Inc | 305,161 | $8.17M | 0.00% | +93,361+44.1% | Added |
| Millennium Management LLC | 290,673 | $7.78M | 0.01% | −407,092−58.3% | Reduced |
| Bank of New York Mellon Corp | 259,061 | $6.94M | 0.00% | −8,767−3.3% | Reduced |
| UBS Group AG | 256,624 | $6.87M | 0.00% | −55,650−17.8% | Reduced |
| Bridge City Capital, LLC | 235,485 | $6.31M | 1.85% | +99,227+72.8% | Added |
| Voloridge Investment Management, LLC | 231,305 | $6.19M | 0.02% | −61,138−20.9% | Reduced |
| Citadel Advisors LLC | 228,724 | $6.13M | 0.00% | +1,949+0.9% | Added |
| Principal Financial Group Inc | 217,974 | $5.84M | 0.00% | +12,296+6.0% | Added |
| Jane Street Group, LLC | 217,537 | $5.83M | 0.01% | +69,078+46.5% | Added |
| Denali Advisors LLC | 211,765 | $5.67M | 0.63% | +76,765+56.9% | Added |
| Pacer Advisors, Inc. | 177,744 | $4.76M | 0.01% | +171,748+2,864.4% | Added |
| Empowered Funds, LLC | 165,907 | $4.44M | 0.08% | +16,112+10.8% | Added |
| JPMorgan Chase & Co | 158,644 | $4.25M | 0.00% | −94,588−37.4% | Reduced |
| First Trust Advisors LP | 140,310 | $3.76M | 0.00% | −10,112−6.7% | Reduced |
| Ameriprise Financial Inc | 133,715 | $3.58M | 0.00% | +3,874+3.0% | Added |
| Lam Group, Inc. | 130,800 | $3.50M | 2.00% | 00.0% | Unchanged |
| Nordea Investment Management AB | 129,144 | $3.46M | 0.00% | −24,207−15.8% | Reduced |
| Bank of America Corp | 128,174 | $3.43M | 0.00% | +1,077+0.8% | Added |
| New York State Common Retirement Fund | 125,968 | $3.37M | 0.00% | +35,799+39.7% | Added |
| Algert Global LLC | 125,130 | $3.35M | 0.05% | −267,772−68.2% | Reduced |
| Public Sector Pension Investment Board | 122,505 | $3.28M | 0.01% | −17,170−12.3% | Reduced |
| Rice Hall James & Associates, LLC | 121,176 | $3.25M | 0.18% | −8,163−6.3% | Reduced |
| Bessemer Group Inc | 120,890 | $3.24M | 0.00% | +120,747+84,438.5% | Added |
| BNP Paribas Arbitrage, SA | 120,893 | $3.24M | 0.00% | −101,126−45.5% | Reduced |
| Trexquant Investment LP | 113,673 | $3.04M | 0.03% | +113,673 | New |
| Qube Research & Technologies Ltd | 111,439 | $2.98M | 0.00% | −129,773−53.8% | Reduced |
| LSV Asset Management | 110,300 | $2.95M | 0.01% | +37,000+50.5% | Added |
| Brandywine Global Investment Management, LLC | 105,417 | $2.82M | 0.02% | +105,417 | New |
| Two Sigma Investments, LP | 98,678 | $2.64M | 0.00% | 00.0% | Unchanged |
| SG Americas Securities, LLC | 93,515 | $2.50M | 0.00% | +93,515 | New |
| Quantedge Capital Pte Ltd | 91,700 | $2.46M | 1.17% | +46,600+103.3% | Added |
| Legal & General Group Plc | 90,730 | $2.43M | 0.00% | −6,884−7.1% | Reduced |
| O'Shaughnessy Asset Management, LLC | 87,183 | $2.33M | 0.01% | +18,125+26.2% | Added |
| Raymond James Financial Inc | 84,454 | $2.26M | 0.00% | −33,733−28.5% | Reduced |
| Rhumbline Advisers | 82,390 | $2.21M | 0.00% | −7,739−8.6% | Reduced |
| Balyasny Asset Management LLC | 77,467 | $2.07M | 0.00% | −64,385−45.4% | Reduced |
| Nuveen, LLC | 76,101 | $2.04M | 0.00% | −1,602−2.1% | Reduced |
| Barclays PLC | 75,319 | $2.02M | 0.00% | +8,825+13.3% | Added |
| Swiss National Bank | 72,600 | $1.94M | 0.00% | 00.0% | Unchanged |
| AQR Capital Management LLC | 67,652 | $1.81M | 0.00% | +5,507+8.9% | Added |
| Susquehanna Portfolio Strategies, LLC | 66,969 | $1.79M | 0.03% | +27,405+69.3% | Added |
| CX Institutional | 64,123 | $1.72M | 0.05% | +807+1.3% | Added |
| Intech Investment Management LLC | 63,232 | $1.69M | 0.02% | +12,072+23.6% | Added |
| CIBC World Markets Inc. | 62,192 | $1.67M | 0.00% | +62,192 | New |
| Alliancebernstein L.P. | 60,630 | $1.62M | 0.00% | +10,000+19.8% | Added |
| Steel Peak Wealth Management LLC | 55,695 | $1.49M | 0.05% | 00.0% | Unchanged |
| UBS Asset Management Americas Inc | 55,232 | $1.48M | 0.00% | +897+1.7% | Added |
| Assetmark, Inc | 54,359 | $1.46M | 0.00% | −2,128−3.8% | Reduced |
| Creative Planning | 51,664 | $1.38M | 0.00% | −3,451−6.3% | Reduced |
| XTX Topco Ltd | 48,607 | $1.30M | 0.03% | +48,607 | New |
| Prudential Financial Inc | 47,203 | $1.26M | 0.00% | −226−0.5% | Reduced |
| Wells Fargo & Company | 45,302 | $1.21M | 0.00% | +16,551+57.6% | Added |
| SummerHaven Investment Management, LLC | 38,200 | $1.02M | 0.58% | 00.0% | Unchanged |
| Price T Rowe Associates Inc | 36,796 | $986.0K | 0.00% | −238,426−86.6% | Reduced |
| California State Teachers Retirement System | 35,798 | $958.7K | 0.00% | −81−0.2% | Reduced |
| Polaris Capital Management, LLC | 35,532 | $951.5K | 0.08% | +22,432+171.2% | Added |
| DekaBank Deutsche Girozentrale | 20,848 | $951.0K | 0.00% | 00.0% | Unchanged |
| Campbell & CO Investment Adviser LLC | 30,682 | $821.7K | 0.04% | −13,386−30.4% | Reduced |
| Great West Life Assurance Co | 30,216 | $809.0K | 0.00% | 00.0% | Unchanged |
| Canada Pension Plan Investment Board | 29,800 | $798.0K | 0.00% | +9,100+44.0% | Added |
| Deutsche Bank AG | 29,557 | $791.5K | 0.00% | +1,161+4.1% | Added |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 29,104 | $785.3K | 0.00% | +29,104 | New |
| Envestnet Asset Management Inc | 28,823 | $771.9K | 0.00% | +6,848+31.2% | Added |
| Illumine Investment Management, LLC | 28,328 | $758.6K | 0.55% | +651+2.4% | Added |
| Citigroup Inc | 28,280 | $757.3K | 0.00% | +8,465+42.7% | Added |
| State of Alaska, Department of Revenue | 27,916 | $747.0K | 0.01% | +7,128+34.3% | Added |
| Gotham Asset Management, LLC | 27,802 | $744.5K | 0.00% | +12,438+81.0% | Added |
| Freestone Grove Partners LP | 27,593 | $738.9K | 0.01% | +27,593 | New |
| Legato Capital Management LLC | 26,590 | $712.1K | 0.06% | −9,470−26.3% | Reduced |
| Arkadios Wealth Advisors | 26,303 | $704.4K | 0.01% | −9,705−27.0% | Reduced |
| Franklin Resources Inc | 26,045 | $697.5K | 0.00% | +16,520+173.4% | Added |
| Advisor OS, LLC | 25,405 | $680.3K | 0.05% | 00.0% | Unchanged |
| Thrivent Financial for Lutherans | 24,313 | $651.0K | 0.00% | −1,515−5.9% | Reduced |
| Federated Hermes, Inc. | 23,537 | $630.3K | 0.00% | +23,537 | New |
| New York State Teachers Retirement System | 22,977 | $615.0K | 0.00% | −351−1.5% | Reduced |
| MetLife Investment Management | 21,075 | $564.4K | 0.00% | −2,018−8.7% | Reduced |