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 2026
Institutional positions in Amphastar Pharmaceuticals, Inc. as of Mar 31, 2026. 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
- 215
- −16 vs. Q4 2025
- Shares held
- 32.3M
- +1.49M (+4.8%) vs. Q4 2025
- Total value
- $634.0M
- −$192.7M (−23.3%) vs. Q4 2025
- New holders
- 29
- 69 more added
- Sold out
- 45
- 95 more reduced
5 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 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, Q1 2026
Shares, value and share of portfolio for each institution holding Amphastar Pharmaceuticals, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Quantedge Capital Pte Ltd | 13,500 | $264.5K | 0.14% | −78,200−85.3% | Reduced |
| Janney Montgomery Scott LLC | 13,817 | $271.0K | 0.00% | −413−2.9% | Reduced |
| Federated Hermes, Inc. | 14,079 | $275.8K | 0.00% | −9,458−40.2% | Reduced |
| Susquehanna International Group, LLP | 14,601 | $286.0K | 0.00% | +6,468+79.5% | Added |
| Assenagon Asset Management S.A. | 15,216 | $298.1K | 0.00% | 00.0% | Unchanged |
| Louisiana State Employees Retirement System | 15,700 | $307.6K | 0.01% | −500−3.1% | Reduced |
| Manufacturers Life Insurance Company, The | 15,879 | $311.1K | 0.00% | −523−3.2% | Reduced |
| Canada Pension Plan Investment Board | 16,300 | $319.3K | 0.00% | −13,500−45.3% | Reduced |
| Creative Planning | 16,403 | $321.3K | 0.00% | −35,261−68.3% | Reduced |
| Mirae Asset Global ETFs Holdings Ltd. | 16,846 | $330.0K | 0.00% | −33−0.2% | Reduced |
| Janus Henderson Group PLC | 16,868 | $330.7K | 0.00% | 00.0% | Unchanged |
| State of Wisconsin Investment Board | 17,388 | $340.6K | 0.00% | −118−0.7% | Reduced |
| nVerses Capital, LLC | 17,685 | $346.4K | 0.31% | +17,685 | New |
| Envestnet Asset Management Inc | 18,268 | $357.9K | 0.00% | −10,555−36.6% | Reduced |
| Verition Fund Management LLC | 18,597 | $364.3K | 0.00% | +18,597 | New |
| Raymond James Financial Inc | 19,055 | $373.3K | 0.00% | −65,399−77.4% | Reduced |
| Illinois Municipal Retirement Fund | 19,528 | $382.6K | 0.00% | −1,385−6.6% | Reduced |
| Round Rock Advisors, LLC | 20,495 | $401.5K | 0.06% | +18+0.1% | Added |
| MetLife Investment Management | 20,761 | $406.7K | 0.00% | −314−1.5% | Reduced |
| Barclays PLC | 21,283 | $416.9K | 0.00% | −54,036−71.7% | Reduced |
| New York State Teachers Retirement System | 21,825 | $428.0K | 0.00% | −1,152−5.0% | Reduced |
| Vanguard Asset Management, Ltd | 23,052 | $451.6K | 0.00% | +23,052 | New |
| Vident Advisory, LLC | 23,244 | $455.4K | 0.00% | +2,835+13.9% | Added |
| Thrivent Financial for Lutherans | 23,618 | $463.0K | 0.00% | −695−2.9% | Reduced |
| Intech Investment Management LLC | 24,207 | $474.2K | 0.00% | −39,025−61.7% | Reduced |
| Advisory Research Inc | 25,335 | $496.3K | 0.06% | +10,174+67.1% | Added |
| Advisor OS, LLC | 25,405 | $497.7K | 0.04% | 00.0% | Unchanged |
| State of Alaska, Department of Revenue | 27,410 | $536.0K | 0.01% | −506−1.8% | Reduced |
| Illumine Investment Management, LLC | 28,078 | $550.0K | 0.42% | −250−0.9% | Reduced |
| California State Teachers Retirement System | 28,299 | $554.4K | 0.00% | −7,499−20.9% | Reduced |
| Squarepoint Ops LLC | 28,345 | $555.3K | 0.00% | +13,485+90.7% | Added |
| Freestone Grove Partners LP | 29,857 | $584.9K | 0.00% | +2,264+8.2% | Added |
| Great West Life Assurance Co | 30,216 | $593.0K | 0.00% | 00.0% | Unchanged |
| Quadrature Capital Ltd | 30,561 | $598.7K | 0.01% | +30,561 | New |
| SummerHaven Investment Management, LLC | 32,633 | $639.3K | 0.39% | −5,567−14.6% | Reduced |
| SG Americas Securities, LLC | 32,806 | $643.0K | 0.00% | −60,709−64.9% | Reduced |
| Deutsche Bank AG | 33,131 | $649.0K | 0.00% | +3,574+12.1% | Added |
| Segall Bryant & Hamill, LLC | 33,318 | $652.7K | 0.01% | +22,133+197.9% | Added |
| Legato Capital Management LLC | 34,135 | $668.7K | 0.06% | +7,545+28.4% | Added |
| Citigroup Inc | 35,904 | $703.4K | 0.00% | +7,624+27.0% | Added |
| Man Group plc | 37,274 | $730.2K | 0.00% | +23,123+163.4% | Added |
| HSBC Holdings PLC | 38,017 | $753.5K | 0.00% | +38,017 | New |
| Wells Fargo & Company | 42,019 | $823.1K | 0.00% | −3,283−7.2% | Reduced |
| Polaris Capital Management, LLC | 43,232 | $846.9K | 0.07% | +7,700+21.7% | Added |
| Price T Rowe Associates Inc | 44,903 | $880.0K | 0.00% | +8,107+22.0% | Added |
| Trexquant Investment LP | 47,867 | $937.7K | 0.01% | −65,806−57.9% | Reduced |
| Steel Peak Wealth Management LLC | 48,462 | $949.4K | 0.03% | −7,233−13.0% | Reduced |
| Vanguard Global Advisers, LLC | 50,163 | $982.7K | 0.00% | +50,163 | New |
| Prudential Financial Inc | 50,693 | $993.1K | 0.00% | +3,490+7.4% | Added |
| Assetmark, Inc | 53,738 | $1.05M | 0.00% | −621−1.1% | Reduced |
| UBS Asset Management Americas Inc | 55,375 | $1.08M | 0.00% | +143+0.3% | Added |
| HRT Financial LP | 56,181 | $1.10M | 0.00% | +56,181 | New |
| Algert Global LLC | 62,360 | $1.22M | 0.02% | −62,770−50.2% | Reduced |
| Hussman Strategic Advisors, Inc. | 63,000 | $1.23M | 0.27% | +63,000 | New |
| Citadel Advisors LLC | 65,540 | $1.28M | 0.00% | −163,184−71.3% | Reduced |
| Robeco Institutional Asset Management B.V. | 66,407 | $1.30M | 0.00% | +66,407 | New |
| Swiss National Bank | 72,600 | $1.42M | 0.00% | 00.0% | Unchanged |
| Nuveen, LLC | 76,595 | $1.50M | 0.00% | +494+0.6% | Added |
| Alliancebernstein L.P. | 56,430 | $1.51M | 0.00% | −4,200−6.9% | Reduced |
| Ameriprise Financial Inc | 78,775 | $1.54M | 0.00% | −54,940−41.1% | Reduced |
| AQR Capital Management LLC | 78,778 | $1.54M | 0.00% | +11,126+16.4% | Added |
| Legal & General Group Plc | 80,916 | $1.59M | 0.00% | −9,814−10.8% | Reduced |
| Exchange Traded Concepts, LLC | 82,416 | $1.61M | 0.01% | +72,998+775.1% | Added |
| Rhumbline Advisers | 83,721 | $1.64M | 0.00% | +1,331+1.6% | Added |
| XTX Topco Ltd | 87,736 | $1.72M | 0.03% | +39,129+80.5% | Added |
| Jane Street Group, LLC | 92,475 | $1.81M | 0.00% | −125,062−57.5% | Reduced |
| JPMorgan Chase & Co | 104,574 | $2.01M | 0.00% | −54,070−34.1% | Reduced |
| O'Shaughnessy Asset Management, LLC | 103,929 | $2.04M | 0.01% | +16,746+19.2% | Added |
| Bessemer Group Inc | 122,046 | $2.39M | 0.00% | +1,156+1.0% | Added |
| Nordea Investment Management AB | 123,824 | $2.42M | 0.00% | −5,320−4.1% | Reduced |
| Public Sector Pension Investment Board | 126,574 | $2.48M | 0.01% | +4,069+3.3% | Added |
| Lam Group, Inc. | 130,800 | $2.56M | 1.41% | 00.0% | Unchanged |
| Two Sigma Investments, LP | 138,148 | $2.71M | 0.00% | +39,470+40.0% | Added |
| Franklin Resources Inc | 139,305 | $2.73M | 0.00% | +113,260+434.9% | Added |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 139,402 | $2.73M | 0.00% | +110,298+379.0% | Added |
| New York State Common Retirement Fund | 148,722 | $2.91M | 0.00% | +22,754+18.1% | Added |
| First Trust Advisors LP | 150,591 | $2.95M | 0.00% | +10,281+7.3% | Added |
| BNP Paribas Arbitrage, SA | 156,077 | $3.06M | 0.00% | +35,184+29.1% | Added |
| Voloridge Investment Management, LLC | 171,188 | $3.35M | 0.01% | −60,117−26.0% | Reduced |
| Bank of America Corp | 174,323 | $3.41M | 0.00% | +46,149+36.0% | Added |
| Empowered Funds, LLC | 181,332 | $3.55M | 0.02% | +15,425+9.3% | Added |
| Rice Hall James & Associates, LLC | 187,348 | $3.67M | 0.20% | +66,172+54.6% | Added |
| Principal Financial Group Inc | 209,131 | $4.10M | 0.00% | −8,843−4.1% | Reduced |
| Vanguard Fiduciary Trust Co | 231,044 | $4.53M | 0.00% | +231,044 | New |
| Bank of New York Mellon Corp | 243,226 | $4.76M | 0.00% | −15,835−6.1% | Reduced |
| Victory Capital Management Inc | 249,617 | $4.89M | 0.00% | −55,544−18.2% | Reduced |
| Pacer Advisors, Inc. | 261,483 | $5.12M | 0.01% | +83,739+47.1% | Added |
| Denali Advisors LLC | 266,465 | $5.22M | 0.58% | +54,700+25.8% | Added |
| Charles Schwab Investment Management Inc | 321,039 | $6.29M | 0.00% | −29,668−8.5% | Reduced |
| Arrowstreet Capital, Limited Partnership | 325,291 | $6.37M | 0.00% | −234,135−41.9% | Reduced |
| Goldman Sachs Group Inc | 329,388 | $6.45M | 0.00% | −227,321−40.8% | Reduced |
| Bridgeway Capital Management, LLC | 330,457 | $6.47M | 0.13% | +6,908+2.1% | Added |
| Bridge City Capital, LLC | 335,105 | $6.56M | 1.82% | +99,620+42.3% | Added |
| Millennium Management LLC | 371,373 | $7.28M | 0.01% | +80,700+27.8% | Added |
| Northern Trust Corp | 372,279 | $7.29M | 0.00% | +888+0.2% | Added |
| Royce & Associates LP | 406,175 | $7.96M | 0.08% | +53,878+15.3% | Added |
| UBS Group AG | 420,263 | $8.23M | 0.00% | +163,639+63.8% | Added |
| Morgan Stanley | 420,337 | $8.23M | 0.00% | −171,294−29.0% | Reduced |
| Systematic Financial Management LP | 452,898 | $8.87M | 0.20% | +17,318+4.0% | Added |
| Renaissance Technologies LLC | 553,900 | $10.9M | 0.02% | +9,200+1.7% | Added |