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, Q1 2025
Institutional positions in Amphastar Pharmaceuticals, Inc. as of Mar 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
- 241
- −18 vs. Q4 2024
- Shares held
- 33.2M
- −1.45M (−4.2%) vs. Q4 2024
- Total value
- $963.6M
- −$324.6M (−25.2%) vs. Q4 2024
- New holders
- 32
- 81 more added
- Sold out
- 50
- 95 more reduced
5 institutions that held it in Q4 2024 haven't filed for Q1 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2024: 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, Q1 2025
Shares, value and share of portfolio for each institution holding Amphastar Pharmaceuticals, Inc.; share changes are against Q4 2024.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| BlackRock, Inc. | 6,147,658 | $178.2M | 0.00% | +29,836+0.5% | Added |
| Vanguard Group Inc | 2,422,904 | $70.2M | 0.00% | −291,724−10.7% | Reduced |
| TD Asset Management Inc | 2,212,142 | $64.1M | 0.06% | +371,856+20.2% | Added |
| State Street Corp | 1,604,614 | $46.5M | 0.00% | +8,504+0.5% | Added |
| Dimensional Fund Advisors LP | 1,356,360 | $39.3M | 0.01% | +157,770+13.2% | Added |
| Fuller & Thaler Asset Management, Inc. | 1,263,598 | $36.6M | 0.14% | +130,672+11.5% | Added |
| Epoch Investment Partners, Inc. | 1,261,307 | $36.6M | 0.19% | +160,034+14.5% | Added |
| Boston Trust Walden Corp | 1,215,624 | $35.2M | 0.26% | +236,704+24.2% | Added |
| Marshall Wace, LLP | 1,031,722 | $29.9M | 0.04% | +423,016+69.5% | Added |
| Geode Capital Management, LLC | 955,076 | $27.7M | 0.00% | +38,995+4.3% | Added |
| Millennium Management LLC | 868,551 | $25.2M | 0.02% | +611,995+238.5% | Added |
| Northern Trust Corp | 594,437 | $17.2M | 0.00% | −18,733−3.1% | Reduced |
| Federated Hermes, Inc. | 585,115 | $17.0M | 0.04% | −238,372−28.9% | Reduced |
| Price T Rowe Associates Inc | 541,221 | $15.7M | 0.00% | −25,435−4.5% | Reduced |
| Morgan Stanley | 522,112 | $15.1M | 0.00% | −109,962−17.4% | Reduced |
| Renaissance Technologies LLC | 495,000 | $14.4M | 0.02% | −30,500−5.8% | Reduced |
| Pacer Advisors, Inc. | 479,390 | $13.9M | 0.03% | −870,978−64.5% | Reduced |
| Boston Partners | 423,070 | $11.9M | 0.01% | −3,566−0.8% | Reduced |
| Goldman Sachs Group Inc | 406,712 | $11.8M | 0.00% | −21,123−4.9% | Reduced |
| Granite Investment Partners, LLC | 375,778 | $10.9M | 0.55% | −20,924−5.3% | Reduced |
| Invesco Ltd. | 359,143 | $10.4M | 0.00% | +60,279+20.2% | Added |
| ExodusPoint Capital Management, LP | 343,292 | $9.95M | 0.13% | +343,292 | New |
| Systematic Financial Management LP | 326,546 | $9.47M | 0.27% | +80,198+32.6% | Added |
| Charles Schwab Investment Management Inc | 326,226 | $9.46M | 0.00% | −21,286−6.1% | Reduced |
| American Century Companies Inc | 307,993 | $8.93M | 0.01% | −164,024−34.7% | Reduced |
| Hotchkis & Wiley Capital Management LLC | 270,150 | $7.83M | 0.03% | +32,630+13.7% | Added |
| Bank of New York Mellon Corp | 266,075 | $7.71M | 0.00% | −19,788−6.9% | Reduced |
| Qube Research & Technologies Ltd | 258,981 | $7.51M | 0.01% | +143,689+124.6% | Added |
| Royce & Associates LP | 247,858 | $7.19M | 0.08% | +238,956+2,684.3% | Added |
| Voloridge Investment Management, LLC | 216,002 | $6.26M | 0.02% | +72,566+50.6% | Added |
| Principal Financial Group Inc | 212,647 | $6.16M | 0.00% | +4,669+2.2% | Added |
| Silvercrest Asset Management Group LLC | 165,856 | $4.81M | 0.03% | −958−0.6% | Reduced |
| Balyasny Asset Management LLC | 162,138 | $4.70M | 0.01% | +162,138 | New |
| Citadel Advisors LLC | 155,979 | $4.52M | 0.00% | +15,566+11.1% | Added |
| Ameriprise Financial Inc | 155,146 | $4.50M | 0.00% | +9,131+6.3% | Added |
| Nordea Investment Management AB | 150,932 | $4.32M | 0.00% | −128,782−46.0% | Reduced |
| Lam Group, Inc. | 130,800 | $3.79M | 2.79% | 00.0% | Unchanged |
| Janus Henderson Group PLC | 124,402 | $3.54M | 0.00% | −64,945−34.3% | Reduced |
| Frontier Capital Management Co LLC | 119,628 | $3.47M | 0.04% | −3,732−3.0% | Reduced |
| Public Sector Pension Investment Board | 118,885 | $3.45M | 0.01% | +25,455+27.2% | Added |
| Bridge City Capital, LLC | 115,855 | $3.36M | 1.01% | +45,760+65.3% | Added |
| Susquehanna Fundamental Investments, LLC | 115,086 | $3.34M | 0.06% | +115,086 | New |
| Bank of America Corp | 106,690 | $3.09M | 0.00% | −5,404−4.8% | Reduced |
| Legal & General Group Plc | 101,576 | $2.94M | 0.00% | −2,165−2.1% | Reduced |
| Nuveen, LLC | 95,665 | $2.77M | 0.00% | +95,665 | New |
| Trexquant Investment LP | 91,291 | $2.65M | 0.03% | −14,237−13.5% | Reduced |
| UBS Group AG | 89,324 | $2.59M | 0.00% | −64,418−41.9% | Reduced |
| Rhumbline Advisers | 88,958 | $2.58M | 0.00% | +1,631+1.9% | Added |
| HRT Financial LP | 86,364 | $2.50M | 0.02% | +86,364 | New |
| Two Sigma Advisers, LP | 84,700 | $2.46M | 0.01% | −1,200−1.4% | Reduced |
| CX Institutional | 82,147 | $2.38M | 0.09% | +82,147 | New |
| New York State Common Retirement Fund | 81,565 | $2.36M | 0.00% | +11,075+15.7% | Added |
| Victory Capital Management Inc | 81,087 | $2.35M | 0.00% | +17,700+27.9% | Added |
| UBS Asset Management Americas Inc | 79,089 | $2.29M | 0.00% | −4,142−5.0% | Reduced |
| Citigroup Inc | 77,737 | $2.25M | 0.00% | +14,566+23.1% | Added |
| Two Sigma Investments, LP | 75,328 | $2.18M | 0.00% | −22,856−23.3% | Reduced |
| Swiss National Bank | 74,500 | $2.16M | 0.00% | −1,900−2.5% | Reduced |
| Susquehanna International Group, LLP | 70,709 | $2.05M | 0.00% | +39,443+126.2% | Added |
| Squarepoint Ops LLC | 69,770 | $2.02M | 0.00% | +52,106+295.0% | Added |
| Barclays PLC | 66,952 | $1.94M | 0.00% | −17,838−21.0% | Reduced |
| JPMorgan Chase & Co | 66,880 | $1.94M | 0.00% | −86,691−56.5% | Reduced |
| Intech Investment Management LLC | 60,289 | $1.75M | 0.02% | +18,133+43.0% | Added |
| Prudential Financial Inc | 37,614 | $1.67M | 0.00% | −1,080−2.8% | Reduced |
| Steel Peak Wealth Management LLC | 55,795 | $1.62M | 0.07% | +55,795 | New |
| Aurora Investment Counsel | 54,081 | $1.57M | 0.87% | −624−1.1% | Reduced |
| AQR Capital Management LLC | 53,638 | $1.55M | 0.00% | +24,167+82.0% | Added |
| Alliancebernstein L.P. | 50,630 | $1.47M | 0.00% | 00.0% | Unchanged |
| Jane Street Group, LLC | 46,665 | $1.35M | 0.00% | −52,822−53.1% | Reduced |
| Campbell & CO Investment Adviser LLC | 45,789 | $1.33M | 0.10% | −1,777−3.7% | Reduced |
| Gsa Capital Partners LLP | 45,297 | $1.31M | 0.12% | +27,863+159.8% | Added |
| Twinbeech Capital LP | 43,986 | $1.28M | 0.02% | −2,811−6.0% | Reduced |
| LSV Asset Management | 43,200 | $1.25M | 0.00% | +6,800+18.7% | Added |
| Assetmark, Inc | 40,537 | $1.18M | 0.00% | −1,384−3.3% | Reduced |
| Engineers Gate Manager LP | 38,545 | $1.12M | 0.02% | +9,437+32.4% | Added |
| Man Group plc | 38,237 | $1.11M | 0.00% | +16,412+75.2% | Added |
| California State Teachers Retirement System | 36,369 | $1.05M | 0.00% | 00.0% | Unchanged |
| Numerai GP LLC | 34,006 | $985.8K | 0.19% | +34,006 | New |
| Arkadios Wealth Advisors | 33,966 | $984.7K | 0.04% | +6,002+21.5% | Added |
| Aristeia Capital LLC | 33,835 | $980.9K | 0.03% | −9,400−21.7% | Reduced |
| Connor, Clark & Lunn Investment Management Ltd. | 32,241 | $934.7K | 0.00% | −35,126−52.1% | Reduced |
| Hussman Strategic Advisors, Inc. | 31,500 | $913.2K | 0.22% | +31,500 | New |
| Great West Life Assurance Co | 31,262 | $907.0K | 0.00% | −3,783−10.8% | Reduced |
| Deutsche Bank AG | 30,910 | $896.1K | 0.00% | −3,172−9.3% | Reduced |
| Polaris Capital Management, LLC | 30,800 | $892.9K | 0.05% | +6,300+25.7% | Added |
| Legato Capital Management LLC | 29,699 | $861.0K | 0.12% | +11,238+60.9% | Added |
| Raymond James Financial Inc | 29,672 | $860.2K | 0.00% | −63,232−68.1% | Reduced |
| Wells Fargo & Company | 29,361 | $851.2K | 0.00% | +5,809+24.7% | Added |
| D. E. Shaw & Co., Inc. | 29,188 | $846.2K | 0.00% | −89,663−75.4% | Reduced |
| Thrivent Financial for Lutherans | 27,547 | $799.0K | 0.00% | −1,441−5.0% | Reduced |
| Illumine Investment Management, LLC | 26,530 | $769.1K | 0.63% | +9,481+55.6% | Added |
| Graham Capital Management, L.P. | 26,424 | $766.0K | 0.02% | +26,424 | New |
| Royal Bank of Canada | 26,079 | $756.0K | 0.00% | −2,553−8.9% | Reduced |
| State of Wisconsin Investment Board | 25,592 | $741.9K | 0.00% | −57−0.2% | Reduced |
| Advisor OS, LLC | 25,405 | $736.5K | 0.08% | 00.0% | Unchanged |
| Martingale Asset Management L P | 24,542 | $711.5K | 0.02% | −15,663−39.0% | Reduced |
| New York State Teachers Retirement System | 23,866 | $692.0K | 0.00% | 00.0% | Unchanged |
| MetLife Investment Management | 23,093 | $669.5K | 0.00% | −359−1.5% | Reduced |
| Mirae Asset Global ETFs Holdings Ltd. | 22,489 | $652.0K | 0.00% | +613+2.8% | Added |
| Tudor Investment Corp Et Al | 21,793 | $631.8K | 0.01% | +21,793 | New |
| Quantbot Technologies LP | 21,109 | $612.0K | 0.02% | −4,345−17.1% | Reduced |