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 |
|---|---|---|---|---|---|
| Invesco Ltd. | 604,774 | $11.8M | 0.00% | +103,370+20.6% | Added |
| LSV Asset Management | 651,714 | $12.8M | 0.03% | +541,414+490.9% | Added |
| D. E. Shaw & Co., Inc. | 665,542 | $13.0M | 0.01% | +108,476+19.5% | Added |
| Vanguard Portfolio Management LLC | 787,816 | $15.4M | 0.00% | +787,816 | New |
| Epoch Investment Partners, Inc. | 898,895 | $17.6M | 0.11% | −227,690−20.2% | Reduced |
| Boston Trust Walden Corp | 944,789 | $18.5M | 0.15% | −142,477−13.1% | Reduced |
| Geode Capital Management, LLC | 976,650 | $19.1M | 0.00% | +89,825+10.1% | Added |
| American Century Companies Inc | 1,017,538 | $19.9M | 0.01% | +352,202+52.9% | Added |
| Marshall Wace, LLP | 1,025,640 | $20.1M | 0.02% | −211,644−17.1% | Reduced |
| Fuller & Thaler Asset Management, Inc. | 1,395,139 | $27.3M | 0.09% | +6760.0% | Added |
| TD Asset Management Inc | 1,541,044 | $30.2M | 0.02% | −422,008−21.5% | Reduced |
| Vanguard Capital Management LLC | 1,543,655 | $30.2M | 0.00% | +1,543,655 | New |
| State Street Corp | 1,607,515 | $31.5M | 0.00% | +75,729+4.9% | Added |
| Dimensional Fund Advisors LP | 2,027,947 | $39.7M | 0.01% | +228,262+12.7% | Added |
| BlackRock, Inc. | 5,421,343 | $106.2M | 0.00% | −40,672−0.7% | Reduced |
| Hotchkis & Wiley Capital Management LLC | 0 | $0 | 0.00% | −402,563−100.0% | Sold out |
| Clark Capital Management Group, Inc. | 0 | $0 | 0.00% | −317,482−100.0% | Sold out |
| Qube Research & Technologies Ltd | 0 | $0 | 0.00% | −111,439−100.0% | Sold out |
| Balyasny Asset Management LLC | 0 | $0 | 0.00% | −77,467−100.0% | Sold out |
| Susquehanna Portfolio Strategies, LLC | 0 | $0 | 0.00% | −66,969−100.0% | Sold out |
| CIBC World Markets Inc. | 0 | $0 | 0.00% | −62,192−100.0% | Sold out |
| DekaBank Deutsche Girozentrale | 0 | $0 | 0.00% | −20,848−100.0% | Sold out |
| Campbell & CO Investment Adviser LLC | 0 | $0 | 0.00% | −30,682−100.0% | Sold out |
| Gotham Asset Management, LLC | 0 | $0 | 0.00% | −27,802−100.0% | Sold out |
| Arkadios Wealth Advisors | 0 | $0 | 0.00% | −26,303−100.0% | Sold out |
| LPL Financial LLC | 0 | $0 | 0.00% | −19,844−100.0% | Sold out |
| Alps Advisors Inc | 0 | $0 | 0.00% | −16,431−100.0% | Sold out |
| Quantinno Capital Management LP | 0 | $0 | 0.00% | −15,568−100.0% | Sold out |
| ExodusPoint Capital Management, LP | 0 | $0 | 0.00% | −14,929−100.0% | Sold out |
| Deerfield Management Company, L.P. (Series C) | 0 | $0 | 0.00% | −14,852−100.0% | Sold out |
| SEI Investments Co | 0 | $0 | 0.00% | −14,649−100.0% | Sold out |
| Quantbot Technologies LP | 0 | $0 | 0.00% | −14,515−100.0% | Sold out |
| Martingale Asset Management L P | 0 | $0 | 0.00% | −12,400−100.0% | Sold out |
| Virginia Retirement Systems Et Al | 0 | $0 | 0.00% | −12,362−100.0% | Sold out |
| Cim, LLC | 0 | $0 | 0.00% | −11,342−100.0% | Sold out |
| Significant Wealth Partners LLC | 0 | $0 | 0.00% | −9,624−100.0% | Sold out |
| Acadian Asset Management LLC | 0 | $0 | 0.00% | −9,332−100.0% | Sold out |
| Ameritas Advisory Services, LLC | 0 | $0 | 0.00% | −9,186−100.0% | Sold out |
| ProShare Advisors LLC | 0 | $0 | 0.00% | −9,083−100.0% | Sold out |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 0 | $0 | 0.00% | −8,760−100.0% | Sold out |
| Commonwealth Equity Services, LLC | 0 | $0 | 0.00% | −8,742−100.0% | Sold out |
| Yousif Capital Management, LLC | 0 | $0 | 0.00% | −8,721−100.0% | Sold out |
| CI Private Wealth, LLC | 0 | $0 | 0.00% | −7,839−100.0% | Sold out |
| Jump Financial, LLC | 0 | $0 | 0.00% | −7,800−100.0% | Sold out |
| Quest Partners LLC | 0 | $0 | 0.00% | −7,720−100.0% | Sold out |
| Rafferty Asset Management, LLC | 0 | $0 | 0.00% | −7,682−100.0% | Sold out |
| State of Wyoming | 0 | $0 | 0.00% | −7,561−100.0% | Sold out |
| Lazard Asset Management LLC | 0 | $0 | 0.00% | −912−100.0% | Sold out |
| Richardson Financial Services Inc. | 0 | $0 | 0.00% | −819−100.0% | Sold out |
| Salomon & Ludwin, LLC | 0 | $0 | 0.00% | −229−100.0% | Sold out |
| Aster Capital Management (DIFC) Ltd | 0 | $0 | 0.00% | −200−100.0% | Sold out |
| Huntington National Bank | 0 | $0 | 0.00% | −191−100.0% | Sold out |
| Daiwa Securities Group Inc. | 0 | $0 | 0.00% | −135−100.0% | Sold out |
| UMA Financial Services, Inc. | 0 | $0 | 0.00% | −41−100.0% | Sold out |
| Private Wealth Management Group, LLC | 0 | $0 | 0.00% | −26−100.0% | Sold out |
| Flagship Harbor Advisors, LLC | 0 | $0 | 0.00% | −25−100.0% | Sold out |
| Hughes Financial Services, LLC | 0 | $0 | 0.00% | −24−100.0% | Sold out |
| Optima Capital LLC | 0 | $0 | 0.00% | −20−100.0% | Sold out |
| Kayne Anderson Rudnick Investment Management LLC | 0 | $0 | 0.00% | −15−100.0% | Sold out |
| Ankerstar Wealth, LLC | 0 | $0 | 0.00% | −15−100.0% | Sold out |
| Vanguard Group Inc | – | – | – | – | Not filed |
| Brandywine Global Investment Management, LLC | – | – | – | – | Not filed |
| Comerica Bank | – | – | – | – | Not filed |
| Global Retirement Partners, LLC | – | – | – | – | Not filed |
| CIBC Private Wealth Group, LLC | – | – | – | – | Not filed |