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, Q3 2025
Institutional positions in Amphastar Pharmaceuticals, Inc. as of Sep 30, 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
- 243
- 0 vs. Q2 2025
- Shares held
- 32.7M
- +30.4K (+0.1%) vs. Q2 2025
- Total value
- $872.8M
- +$120.8M (+16.1%) vs. Q2 2025
- New holders
- 34
- 82 more added
- Sold out
- 34
- 92 more reduced
2 institutions that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 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, Q3 2025
Shares, value and share of portfolio for each institution holding Amphastar Pharmaceuticals, Inc.; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Bridge City Capital, LLC | 136,258 | $3.63M | 0.97% | −2,386−1.7% | Reduced |
| Public Sector Pension Investment Board | 139,675 | $3.72M | 0.01% | +14,312+11.4% | Added |
| Balyasny Asset Management LLC | 141,852 | $3.78M | 0.01% | −124,454−46.7% | Reduced |
| Jane Street Group, LLC | 148,459 | $3.96M | 0.00% | −11,623−7.3% | Reduced |
| Empowered Funds, LLC | 149,795 | $3.99M | 0.04% | +64,683+76.0% | Added |
| First Trust Advisors LP | 150,422 | $4.01M | 0.00% | +56,117+59.5% | Added |
| Nordea Investment Management AB | 153,351 | $4.09M | 0.00% | +1,336+0.9% | Added |
| Principal Financial Group Inc | 205,678 | $5.48M | 0.00% | −13,364−6.1% | Reduced |
| Victory Capital Management Inc | 211,800 | $5.64M | 0.00% | +134,938+175.6% | Added |
| BNP Paribas Arbitrage, SA | 222,019 | $5.92M | 0.00% | +150,330+209.7% | Added |
| Citadel Advisors LLC | 226,775 | $6.04M | 0.00% | −65,570−22.4% | Reduced |
| Qube Research & Technologies Ltd | 241,212 | $6.43M | 0.01% | −228,280−48.6% | Reduced |
| Goldman Sachs Group Inc | 241,228 | $6.43M | 0.00% | −115,022−32.3% | Reduced |
| JPMorgan Chase & Co | 253,232 | $6.75M | 0.00% | +95,118+60.2% | Added |
| Bank of New York Mellon Corp | 267,828 | $7.14M | 0.00% | −46,975−14.9% | Reduced |
| Price T Rowe Associates Inc | 275,222 | $7.34M | 0.00% | +1,934+0.7% | Added |
| Clark Capital Management Group, Inc. | 283,674 | $7.56M | 0.05% | +283,674 | New |
| American Century Companies Inc | 288,585 | $7.69M | 0.00% | +55,424+23.8% | Added |
| Voloridge Investment Management, LLC | 292,443 | $7.79M | 0.03% | −33,069−10.2% | Reduced |
| UBS Group AG | 312,274 | $8.32M | 0.00% | +245,440+367.2% | Added |
| Bridgeway Capital Management, LLC | 312,337 | $8.32M | 0.18% | +227,225+267.0% | Added |
| Hotchkis & Wiley Capital Management LLC | 326,183 | $8.69M | 0.03% | −39,737−10.9% | Reduced |
| Charles Schwab Investment Management Inc | 356,409 | $9.50M | 0.00% | +9,625+2.8% | Added |
| Royce & Associates LP | 366,322 | $9.76M | 0.10% | +83,135+29.4% | Added |
| Invesco Ltd. | 389,593 | $10.4M | 0.00% | +2,622+0.7% | Added |
| Arrowstreet Capital, Limited Partnership | 392,310 | $10.5M | 0.01% | +311,071+382.9% | Added |
| Algert Global LLC | 392,902 | $10.5M | 0.18% | +268,612+216.1% | Added |
| Northern Trust Corp | 399,470 | $10.6M | 0.00% | −21,666−5.1% | Reduced |
| Systematic Financial Management LP | 423,112 | $11.3M | 0.27% | +63,805+17.8% | Added |
| D. E. Shaw & Co., Inc. | 517,222 | $13.8M | 0.01% | +223,294+76.0% | Added |
| Morgan Stanley | 574,679 | $15.3M | 0.00% | −106,543−15.6% | Reduced |
| Renaissance Technologies LLC | 586,900 | $15.6M | 0.02% | +10,400+1.8% | Added |
| Millennium Management LLC | 697,765 | $18.6M | 0.01% | +78,781+12.7% | Added |
| Marshall Wace, LLP | 874,068 | $23.3M | 0.03% | +25,383+3.0% | Added |
| Geode Capital Management, LLC | 922,577 | $24.6M | 0.00% | −50,660−5.2% | Reduced |
| Epoch Investment Partners, Inc. | 1,133,986 | $30.2M | 0.17% | −107,383−8.7% | Reduced |
| Boston Trust Walden Corp | 1,173,107 | $31.3M | 0.23% | −3,346−0.3% | Reduced |
| Fuller & Thaler Asset Management, Inc. | 1,353,927 | $36.1M | 0.12% | +90,155+7.1% | Added |
| State Street Corp | 1,500,742 | $40.0M | 0.00% | −75,491−4.8% | Reduced |
| Dimensional Fund Advisors LP | 1,755,665 | $46.8M | 0.01% | +128,781+7.9% | Added |
| TD Asset Management Inc | 1,931,892 | $51.5M | 0.04% | −103,038−5.1% | Reduced |
| Vanguard Group Inc | 2,631,040 | $70.1M | 0.00% | −55,910−2.1% | Reduced |
| BlackRock, Inc. | 5,485,057 | $146.2M | 0.00% | −183,736−3.2% | Reduced |
| Trexquant Investment LP | 0 | $0 | 0.00% | −155,229−100.0% | Sold out |
| Twinbeech Capital LP | 0 | $0 | 0.00% | −88,530−100.0% | Sold out |
| Jump Financial, LLC | 0 | $0 | 0.00% | −63,334−100.0% | Sold out |
| Gsa Capital Partners LLP | 0 | $0 | 0.00% | −57,057−100.0% | Sold out |
| Susquehanna International Group, LLP | 0 | $0 | 0.00% | −54,598−100.0% | Sold out |
| Engineers Gate Manager LP | 0 | $0 | 0.00% | −53,348−100.0% | Sold out |
| Aurora Investment Counsel | 0 | $0 | 0.00% | −53,253−100.0% | Sold out |
| Capital Fund Management S.A. | 0 | $0 | 0.00% | −40,570−100.0% | Sold out |
| Edgestream Partners, L.P. | 0 | $0 | 0.00% | −37,112−100.0% | Sold out |
| Aristeia Capital LLC | 0 | $0 | 0.00% | −33,835−100.0% | Sold out |
| Dynamic Technology Lab Private Ltd | 0 | $0 | 0.00% | −33,300−100.0% | Sold out |
| ExodusPoint Capital Management, LP | 0 | $0 | 0.00% | −32,444−100.0% | Sold out |
| SG Americas Securities, LLC | 0 | $0 | 0.00% | −24,448−100.0% | Sold out |
| Centiva Capital, LP | 0 | $0 | 0.00% | −24,161−100.0% | Sold out |
| Fox Run Management, L.L.C. | 0 | $0 | 0.00% | −21,199−100.0% | Sold out |
| Aquatic Capital Management LLC | 0 | $0 | 0.00% | −21,195−100.0% | Sold out |
| Graham Capital Management, L.P. | 0 | $0 | 0.00% | −20,288−100.0% | Sold out |
| Voya Investment Management LLC | 0 | $0 | 0.00% | −18,099−100.0% | Sold out |
| Occudo Quantitative Strategies LP | 0 | $0 | 0.00% | −15,774−100.0% | Sold out |
| Magnetar Financial LLC | 0 | $0 | 0.00% | −13,337−100.0% | Sold out |
| Tudor Investment Corp Et Al | 0 | $0 | 0.00% | −12,916−100.0% | Sold out |
| Federated Hermes, Inc. | 0 | $0 | 0.00% | −11,224−100.0% | Sold out |
| Maryland State Retirement & Pension System | 0 | $0 | 0.00% | −10,936−100.0% | Sold out |
| Schonfeld Strategic Advisors LLC | 0 | $0 | 0.00% | −10,340−100.0% | Sold out |
| Deerfield Management Company, L.P. (Series C) | 0 | $0 | 0.00% | −9,579−100.0% | Sold out |
| Lazard Asset Management LLC | 0 | $0 | 0.00% | −6,344−100.0% | Sold out |
| Skopos Labs, Inc. | 0 | $0 | 0.00% | −3,778−100.0% | Sold out |
| Pinnacle Financial Partners Inc | 0 | $0 | 0.00% | −1,000−100.0% | Sold out |
| Leonteq Securities AG | 0 | $0 | 0.00% | −1,000−100.0% | Sold out |
| TD Waterhouse Canada Inc. | 0 | $0 | 0.00% | −100−100.0% | Sold out |
| Anchor Investment Management, LLC | 0 | $0 | 0.00% | −75−100.0% | Sold out |
| Bare Financial Services, Inc | 0 | $0 | 0.00% | −19−100.0% | Sold out |
| Elequin Capital LP | 0 | $0 | 0.00% | −14−100.0% | Sold out |
| WealthTrak Capital Management LLC | 0 | $0 | 0.00% | −5−100.0% | Sold out |
| First Horizon Advisors, Inc. | – | – | – | – | Not filed |
| Legacy Investment Solutions, LLC | – | – | – | – | Not filed |