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 |
|---|---|---|---|---|---|
| Empowered Funds, LLC | 165,907 | $4.44M | 0.08% | +16,112+10.8% | Added |
| Pacer Advisors, Inc. | 177,744 | $4.76M | 0.01% | +171,748+2,864.4% | Added |
| Denali Advisors LLC | 211,765 | $5.67M | 0.63% | +76,765+56.9% | Added |
| Jane Street Group, LLC | 217,537 | $5.83M | 0.01% | +69,078+46.5% | Added |
| Principal Financial Group Inc | 217,974 | $5.84M | 0.00% | +12,296+6.0% | Added |
| Citadel Advisors LLC | 228,724 | $6.13M | 0.00% | +1,949+0.9% | Added |
| Voloridge Investment Management, LLC | 231,305 | $6.19M | 0.02% | −61,138−20.9% | Reduced |
| Bridge City Capital, LLC | 235,485 | $6.31M | 1.85% | +99,227+72.8% | Added |
| UBS Group AG | 256,624 | $6.87M | 0.00% | −55,650−17.8% | Reduced |
| Bank of New York Mellon Corp | 259,061 | $6.94M | 0.00% | −8,767−3.3% | Reduced |
| Millennium Management LLC | 290,673 | $7.78M | 0.01% | −407,092−58.3% | Reduced |
| Victory Capital Management Inc | 305,161 | $8.17M | 0.00% | +93,361+44.1% | Added |
| Clark Capital Management Group, Inc. | 317,482 | $8.50M | 0.05% | +33,808+11.9% | Added |
| Bridgeway Capital Management, LLC | 323,549 | $8.66M | 0.18% | +11,212+3.6% | Added |
| Charles Schwab Investment Management Inc | 350,707 | $9.39M | 0.00% | −5,702−1.6% | Reduced |
| Royce & Associates LP | 352,297 | $9.43M | 0.10% | −14,025−3.8% | Reduced |
| Northern Trust Corp | 371,391 | $9.95M | 0.00% | −28,079−7.0% | Reduced |
| Hotchkis & Wiley Capital Management LLC | 402,563 | $10.8M | 0.03% | +76,380+23.4% | Added |
| Systematic Financial Management LP | 435,580 | $11.7M | 0.27% | +12,468+2.9% | Added |
| Invesco Ltd. | 501,404 | $13.4M | 0.00% | +111,811+28.7% | Added |
| Renaissance Technologies LLC | 544,700 | $14.6M | 0.02% | −42,200−7.2% | Reduced |
| Goldman Sachs Group Inc | 556,709 | $14.9M | 0.00% | +315,481+130.8% | Added |
| D. E. Shaw & Co., Inc. | 557,066 | $14.9M | 0.01% | +39,844+7.7% | Added |
| Arrowstreet Capital, Limited Partnership | 559,426 | $15.0M | 0.01% | +167,116+42.6% | Added |
| Morgan Stanley | 591,631 | $15.8M | 0.00% | +16,952+2.9% | Added |
| American Century Companies Inc | 665,336 | $17.8M | 0.01% | +376,751+130.6% | Added |
| Geode Capital Management, LLC | 886,825 | $23.8M | 0.00% | −35,752−3.9% | Reduced |
| Boston Trust Walden Corp | 1,087,266 | $29.1M | 0.22% | −85,841−7.3% | Reduced |
| Epoch Investment Partners, Inc. | 1,126,585 | $30.2M | 0.17% | −7,401−0.7% | Reduced |
| Marshall Wace, LLP | 1,237,284 | $33.1M | 0.03% | +363,216+41.6% | Added |
| Fuller & Thaler Asset Management, Inc. | 1,394,463 | $37.3M | 0.13% | +40,536+3.0% | Added |
| State Street Corp | 1,531,786 | $41.0M | 0.00% | +31,044+2.1% | Added |
| Dimensional Fund Advisors LP | 1,799,685 | $48.2M | 0.01% | +44,020+2.5% | Added |
| TD Asset Management Inc | 1,963,052 | $52.6M | 0.04% | +31,160+1.6% | Added |
| Vanguard Group Inc | 2,608,158 | $69.8M | 0.00% | −22,882−0.9% | Reduced |
| BlackRock, Inc. | 5,462,015 | $146.3M | 0.00% | −23,042−0.4% | Reduced |
| Jefferies Financial Group Inc. | 0 | $0 | 0.00% | −89,233−100.0% | Sold out |
| HRT Financial LP | 0 | $0 | 0.00% | −77,746−100.0% | Sold out |
| Y-Intercept (Hong Kong) Ltd | 0 | $0 | 0.00% | −25,090−100.0% | Sold out |
| Danske Bank A/S | 0 | $0 | 0.00% | −23,043−100.0% | Sold out |
| Two Sigma Advisers, LP | 0 | $0 | 0.00% | −22,800−100.0% | Sold out |
| Lighthouse Investment Partners, LLC | 0 | $0 | 0.00% | −21,600−100.0% | Sold out |
| Cynosure Management, LLC | 0 | $0 | 0.00% | −17,820−100.0% | Sold out |
| Wellington Management Group LLP | 0 | $0 | 0.00% | −17,199−100.0% | Sold out |
| Jackson Creek Investment Advisors LLC | 0 | $0 | 0.00% | −14,743−100.0% | Sold out |
| PDT Partners, LLC | 0 | $0 | 0.00% | −14,630−100.0% | Sold out |
| Handelsbanken Fonder AB | 0 | $0 | 0.00% | −14,400−100.0% | Sold out |
| Susquehanna Fundamental Investments, LLC | 0 | $0 | 0.00% | −12,568−100.0% | Sold out |
| Hohimer Wealth Management, LLC | 0 | $0 | 0.00% | −11,972−100.0% | Sold out |
| Teacher Retirement System of Texas | 0 | $0 | 0.00% | −9,356−100.0% | Sold out |
| Bank of Montreal | 0 | $0 | 0.00% | −8,968−100.0% | Sold out |
| Pathstone Holdings, LLC | 0 | $0 | 0.00% | −7,984−100.0% | Sold out |
| Wolverine Asset Management LLC | 0 | $0 | 0.00% | −4,743−100.0% | Sold out |
| Oakworth Capital, Inc. | 0 | $0 | 0.00% | −1,874−100.0% | Sold out |
| Principal Securities, Inc. | 0 | $0 | 0.00% | −1,604−100.0% | Sold out |
| Quarry LP | 0 | $0 | 0.00% | −1,183−100.0% | Sold out |
| FNY Investment Advisers, LLC | 0 | $0 | 0.00% | −1,000−100.0% | Sold out |
| Harbour Investments, Inc. | 0 | $0 | 0.00% | −270−100.0% | Sold out |
| Simplex Trading, LLC | 0 | $0 | 0.00% | −274−100.0% | Sold out |
| Wealthspire Advisors, LLC | 0 | $0 | 0.00% | −70−100.0% | Sold out |
| Northwestern Mutual Wealth Management Co | 0 | $0 | 0.00% | −62−100.0% | Sold out |
| Private Trust Co NA | 0 | $0 | 0.00% | −54−100.0% | Sold out |
| Atlantic Trust, LLC | 0 | $0 | 0.00% | −33−100.0% | Sold out |
| Rialto Wealth Management, LLC | 0 | $0 | 0.00% | −23−100.0% | Sold out |
| Bell Investment Advisors, Inc | 0 | $0 | 0.00% | −16−100.0% | Sold out |
| Annis Gardner Whiting Capital Advisors, LLC | 0 | $0 | 0.00% | −16−100.0% | Sold out |
| Kilter Group LLC | 0 | $0 | 0.00% | −15−100.0% | Sold out |
| Caitong International Asset Management Co., Ltd | 0 | $0 | 0.00% | −3−100.0% | Sold out |
| Shell Asset Management Co | – | – | – | – | Not filed |