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 |
|---|---|---|---|---|---|
| BlackRock, Inc. | 5,421,343 | $106.2M | 0.00% | −40,672−0.7% | Reduced |
| Dimensional Fund Advisors LP | 2,027,947 | $39.7M | 0.01% | +228,262+12.7% | Added |
| State Street Corp | 1,607,515 | $31.5M | 0.00% | +75,729+4.9% | Added |
| Vanguard Capital Management LLC | 1,543,655 | $30.2M | 0.00% | +1,543,655 | New |
| TD Asset Management Inc | 1,541,044 | $30.2M | 0.02% | −422,008−21.5% | Reduced |
| Fuller & Thaler Asset Management, Inc. | 1,395,139 | $27.3M | 0.09% | +6760.0% | Added |
| Marshall Wace, LLP | 1,025,640 | $20.1M | 0.02% | −211,644−17.1% | Reduced |
| American Century Companies Inc | 1,017,538 | $19.9M | 0.01% | +352,202+52.9% | Added |
| Geode Capital Management, LLC | 976,650 | $19.1M | 0.00% | +89,825+10.1% | Added |
| Boston Trust Walden Corp | 944,789 | $18.5M | 0.15% | −142,477−13.1% | Reduced |
| Epoch Investment Partners, Inc. | 898,895 | $17.6M | 0.11% | −227,690−20.2% | Reduced |
| Vanguard Portfolio Management LLC | 787,816 | $15.4M | 0.00% | +787,816 | New |
| D. E. Shaw & Co., Inc. | 665,542 | $13.0M | 0.01% | +108,476+19.5% | Added |
| LSV Asset Management | 651,714 | $12.8M | 0.03% | +541,414+490.9% | Added |
| Invesco Ltd. | 604,774 | $11.8M | 0.00% | +103,370+20.6% | Added |
| Renaissance Technologies LLC | 553,900 | $10.9M | 0.02% | +9,200+1.7% | Added |
| Systematic Financial Management LP | 452,898 | $8.87M | 0.20% | +17,318+4.0% | Added |
| Morgan Stanley | 420,337 | $8.23M | 0.00% | −171,294−29.0% | Reduced |
| UBS Group AG | 420,263 | $8.23M | 0.00% | +163,639+63.8% | Added |
| Royce & Associates LP | 406,175 | $7.96M | 0.08% | +53,878+15.3% | Added |
| Northern Trust Corp | 372,279 | $7.29M | 0.00% | +888+0.2% | Added |
| Millennium Management LLC | 371,373 | $7.28M | 0.01% | +80,700+27.8% | Added |
| Bridge City Capital, LLC | 335,105 | $6.56M | 1.82% | +99,620+42.3% | Added |
| Bridgeway Capital Management, LLC | 330,457 | $6.47M | 0.13% | +6,908+2.1% | Added |
| Goldman Sachs Group Inc | 329,388 | $6.45M | 0.00% | −227,321−40.8% | Reduced |
| Arrowstreet Capital, Limited Partnership | 325,291 | $6.37M | 0.00% | −234,135−41.9% | Reduced |
| Charles Schwab Investment Management Inc | 321,039 | $6.29M | 0.00% | −29,668−8.5% | Reduced |
| Denali Advisors LLC | 266,465 | $5.22M | 0.58% | +54,700+25.8% | Added |
| Pacer Advisors, Inc. | 261,483 | $5.12M | 0.01% | +83,739+47.1% | Added |
| Victory Capital Management Inc | 249,617 | $4.89M | 0.00% | −55,544−18.2% | Reduced |
| Bank of New York Mellon Corp | 243,226 | $4.76M | 0.00% | −15,835−6.1% | Reduced |
| Vanguard Fiduciary Trust Co | 231,044 | $4.53M | 0.00% | +231,044 | New |
| Principal Financial Group Inc | 209,131 | $4.10M | 0.00% | −8,843−4.1% | Reduced |
| Rice Hall James & Associates, LLC | 187,348 | $3.67M | 0.20% | +66,172+54.6% | Added |
| Empowered Funds, LLC | 181,332 | $3.55M | 0.02% | +15,425+9.3% | Added |
| Bank of America Corp | 174,323 | $3.41M | 0.00% | +46,149+36.0% | Added |
| Voloridge Investment Management, LLC | 171,188 | $3.35M | 0.01% | −60,117−26.0% | Reduced |
| BNP Paribas Arbitrage, SA | 156,077 | $3.06M | 0.00% | +35,184+29.1% | Added |
| First Trust Advisors LP | 150,591 | $2.95M | 0.00% | +10,281+7.3% | Added |
| New York State Common Retirement Fund | 148,722 | $2.91M | 0.00% | +22,754+18.1% | Added |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 139,402 | $2.73M | 0.00% | +110,298+379.0% | Added |
| Franklin Resources Inc | 139,305 | $2.73M | 0.00% | +113,260+434.9% | Added |
| Two Sigma Investments, LP | 138,148 | $2.71M | 0.00% | +39,470+40.0% | Added |
| Lam Group, Inc. | 130,800 | $2.56M | 1.41% | 00.0% | Unchanged |
| Public Sector Pension Investment Board | 126,574 | $2.48M | 0.01% | +4,069+3.3% | Added |
| Nordea Investment Management AB | 123,824 | $2.42M | 0.00% | −5,320−4.1% | Reduced |
| Bessemer Group Inc | 122,046 | $2.39M | 0.00% | +1,156+1.0% | Added |
| O'Shaughnessy Asset Management, LLC | 103,929 | $2.04M | 0.01% | +16,746+19.2% | Added |
| JPMorgan Chase & Co | 104,574 | $2.01M | 0.00% | −54,070−34.1% | Reduced |
| Jane Street Group, LLC | 92,475 | $1.81M | 0.00% | −125,062−57.5% | Reduced |
| XTX Topco Ltd | 87,736 | $1.72M | 0.03% | +39,129+80.5% | Added |
| Rhumbline Advisers | 83,721 | $1.64M | 0.00% | +1,331+1.6% | Added |
| Exchange Traded Concepts, LLC | 82,416 | $1.61M | 0.01% | +72,998+775.1% | Added |
| Legal & General Group Plc | 80,916 | $1.59M | 0.00% | −9,814−10.8% | Reduced |
| AQR Capital Management LLC | 78,778 | $1.54M | 0.00% | +11,126+16.4% | Added |
| Ameriprise Financial Inc | 78,775 | $1.54M | 0.00% | −54,940−41.1% | Reduced |
| Alliancebernstein L.P. | 56,430 | $1.51M | 0.00% | −4,200−6.9% | Reduced |
| Nuveen, LLC | 76,595 | $1.50M | 0.00% | +494+0.6% | Added |
| Swiss National Bank | 72,600 | $1.42M | 0.00% | 00.0% | Unchanged |
| Robeco Institutional Asset Management B.V. | 66,407 | $1.30M | 0.00% | +66,407 | New |
| Citadel Advisors LLC | 65,540 | $1.28M | 0.00% | −163,184−71.3% | Reduced |
| Hussman Strategic Advisors, Inc. | 63,000 | $1.23M | 0.27% | +63,000 | New |
| Algert Global LLC | 62,360 | $1.22M | 0.02% | −62,770−50.2% | Reduced |
| HRT Financial LP | 56,181 | $1.10M | 0.00% | +56,181 | New |
| UBS Asset Management Americas Inc | 55,375 | $1.08M | 0.00% | +143+0.3% | Added |
| Assetmark, Inc | 53,738 | $1.05M | 0.00% | −621−1.1% | Reduced |
| Prudential Financial Inc | 50,693 | $993.1K | 0.00% | +3,490+7.4% | Added |
| Vanguard Global Advisers, LLC | 50,163 | $982.7K | 0.00% | +50,163 | New |
| Steel Peak Wealth Management LLC | 48,462 | $949.4K | 0.03% | −7,233−13.0% | Reduced |
| Trexquant Investment LP | 47,867 | $937.7K | 0.01% | −65,806−57.9% | Reduced |
| Price T Rowe Associates Inc | 44,903 | $880.0K | 0.00% | +8,107+22.0% | Added |
| Polaris Capital Management, LLC | 43,232 | $846.9K | 0.07% | +7,700+21.7% | Added |
| Wells Fargo & Company | 42,019 | $823.1K | 0.00% | −3,283−7.2% | Reduced |
| HSBC Holdings PLC | 38,017 | $753.5K | 0.00% | +38,017 | New |
| Man Group plc | 37,274 | $730.2K | 0.00% | +23,123+163.4% | Added |
| Citigroup Inc | 35,904 | $703.4K | 0.00% | +7,624+27.0% | Added |
| Legato Capital Management LLC | 34,135 | $668.7K | 0.06% | +7,545+28.4% | Added |
| Segall Bryant & Hamill, LLC | 33,318 | $652.7K | 0.01% | +22,133+197.9% | Added |
| Deutsche Bank AG | 33,131 | $649.0K | 0.00% | +3,574+12.1% | Added |
| SG Americas Securities, LLC | 32,806 | $643.0K | 0.00% | −60,709−64.9% | Reduced |
| SummerHaven Investment Management, LLC | 32,633 | $639.3K | 0.39% | −5,567−14.6% | Reduced |
| Quadrature Capital Ltd | 30,561 | $598.7K | 0.01% | +30,561 | New |
| Great West Life Assurance Co | 30,216 | $593.0K | 0.00% | 00.0% | Unchanged |
| Freestone Grove Partners LP | 29,857 | $584.9K | 0.00% | +2,264+8.2% | Added |
| Squarepoint Ops LLC | 28,345 | $555.3K | 0.00% | +13,485+90.7% | Added |
| California State Teachers Retirement System | 28,299 | $554.4K | 0.00% | −7,499−20.9% | Reduced |
| Illumine Investment Management, LLC | 28,078 | $550.0K | 0.42% | −250−0.9% | Reduced |
| State of Alaska, Department of Revenue | 27,410 | $536.0K | 0.01% | −506−1.8% | Reduced |
| Advisor OS, LLC | 25,405 | $497.7K | 0.04% | 00.0% | Unchanged |
| Advisory Research Inc | 25,335 | $496.3K | 0.06% | +10,174+67.1% | Added |
| Intech Investment Management LLC | 24,207 | $474.2K | 0.00% | −39,025−61.7% | Reduced |
| Thrivent Financial for Lutherans | 23,618 | $463.0K | 0.00% | −695−2.9% | Reduced |
| Vident Advisory, LLC | 23,244 | $455.4K | 0.00% | +2,835+13.9% | Added |
| Vanguard Asset Management, Ltd | 23,052 | $451.6K | 0.00% | +23,052 | New |
| New York State Teachers Retirement System | 21,825 | $428.0K | 0.00% | −1,152−5.0% | Reduced |
| Barclays PLC | 21,283 | $416.9K | 0.00% | −54,036−71.7% | Reduced |
| MetLife Investment Management | 20,761 | $406.7K | 0.00% | −314−1.5% | Reduced |
| Round Rock Advisors, LLC | 20,495 | $401.5K | 0.06% | +18+0.1% | Added |
| Illinois Municipal Retirement Fund | 19,528 | $382.6K | 0.00% | −1,385−6.6% | Reduced |
| Raymond James Financial Inc | 19,055 | $373.3K | 0.00% | −65,399−77.4% | Reduced |