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 |
|---|---|---|---|---|---|
| BlackRock, Inc. | 5,485,057 | $146.2M | 0.00% | −183,736−3.2% | Reduced |
| Vanguard Group Inc | 2,631,040 | $70.1M | 0.00% | −55,910−2.1% | Reduced |
| TD Asset Management Inc | 1,931,892 | $51.5M | 0.04% | −103,038−5.1% | Reduced |
| Dimensional Fund Advisors LP | 1,755,665 | $46.8M | 0.01% | +128,781+7.9% | Added |
| State Street Corp | 1,500,742 | $40.0M | 0.00% | −75,491−4.8% | Reduced |
| Fuller & Thaler Asset Management, Inc. | 1,353,927 | $36.1M | 0.12% | +90,155+7.1% | Added |
| Boston Trust Walden Corp | 1,173,107 | $31.3M | 0.23% | −3,346−0.3% | Reduced |
| Epoch Investment Partners, Inc. | 1,133,986 | $30.2M | 0.17% | −107,383−8.7% | Reduced |
| Geode Capital Management, LLC | 922,577 | $24.6M | 0.00% | −50,660−5.2% | Reduced |
| Marshall Wace, LLP | 874,068 | $23.3M | 0.03% | +25,383+3.0% | Added |
| Millennium Management LLC | 697,765 | $18.6M | 0.01% | +78,781+12.7% | Added |
| Renaissance Technologies LLC | 586,900 | $15.6M | 0.02% | +10,400+1.8% | Added |
| Morgan Stanley | 574,679 | $15.3M | 0.00% | −106,543−15.6% | Reduced |
| D. E. Shaw & Co., Inc. | 517,222 | $13.8M | 0.01% | +223,294+76.0% | Added |
| Systematic Financial Management LP | 423,112 | $11.3M | 0.27% | +63,805+17.8% | Added |
| Northern Trust Corp | 399,470 | $10.6M | 0.00% | −21,666−5.1% | Reduced |
| Algert Global LLC | 392,902 | $10.5M | 0.18% | +268,612+216.1% | Added |
| Arrowstreet Capital, Limited Partnership | 392,310 | $10.5M | 0.01% | +311,071+382.9% | Added |
| Invesco Ltd. | 389,593 | $10.4M | 0.00% | +2,622+0.7% | Added |
| Royce & Associates LP | 366,322 | $9.76M | 0.10% | +83,135+29.4% | Added |
| Charles Schwab Investment Management Inc | 356,409 | $9.50M | 0.00% | +9,625+2.8% | Added |
| Hotchkis & Wiley Capital Management LLC | 326,183 | $8.69M | 0.03% | −39,737−10.9% | Reduced |
| Bridgeway Capital Management, LLC | 312,337 | $8.32M | 0.18% | +227,225+267.0% | Added |
| UBS Group AG | 312,274 | $8.32M | 0.00% | +245,440+367.2% | Added |
| Voloridge Investment Management, LLC | 292,443 | $7.79M | 0.03% | −33,069−10.2% | Reduced |
| American Century Companies Inc | 288,585 | $7.69M | 0.00% | +55,424+23.8% | Added |
| Clark Capital Management Group, Inc. | 283,674 | $7.56M | 0.05% | +283,674 | New |
| Price T Rowe Associates Inc | 275,222 | $7.34M | 0.00% | +1,934+0.7% | Added |
| Bank of New York Mellon Corp | 267,828 | $7.14M | 0.00% | −46,975−14.9% | Reduced |
| JPMorgan Chase & Co | 253,232 | $6.75M | 0.00% | +95,118+60.2% | Added |
| Goldman Sachs Group Inc | 241,228 | $6.43M | 0.00% | −115,022−32.3% | Reduced |
| Qube Research & Technologies Ltd | 241,212 | $6.43M | 0.01% | −228,280−48.6% | Reduced |
| Citadel Advisors LLC | 226,775 | $6.04M | 0.00% | −65,570−22.4% | Reduced |
| BNP Paribas Arbitrage, SA | 222,019 | $5.92M | 0.00% | +150,330+209.7% | Added |
| Victory Capital Management Inc | 211,800 | $5.64M | 0.00% | +134,938+175.6% | Added |
| Principal Financial Group Inc | 205,678 | $5.48M | 0.00% | −13,364−6.1% | Reduced |
| Nordea Investment Management AB | 153,351 | $4.09M | 0.00% | +1,336+0.9% | Added |
| First Trust Advisors LP | 150,422 | $4.01M | 0.00% | +56,117+59.5% | Added |
| Empowered Funds, LLC | 149,795 | $3.99M | 0.04% | +64,683+76.0% | Added |
| Jane Street Group, LLC | 148,459 | $3.96M | 0.00% | −11,623−7.3% | Reduced |
| Balyasny Asset Management LLC | 141,852 | $3.78M | 0.01% | −124,454−46.7% | Reduced |
| Public Sector Pension Investment Board | 139,675 | $3.72M | 0.01% | +14,312+11.4% | Added |
| Bridge City Capital, LLC | 136,258 | $3.63M | 0.97% | −2,386−1.7% | Reduced |
| Denali Advisors LLC | 135,000 | $3.60M | 0.41% | +135,000 | New |
| Lam Group, Inc. | 130,800 | $3.49M | 2.16% | 00.0% | Unchanged |
| Ameriprise Financial Inc | 129,841 | $3.46M | 0.00% | −40,008−23.6% | Reduced |
| Rice Hall James & Associates, LLC | 129,339 | $3.45M | 0.19% | +129,339 | New |
| Bank of America Corp | 127,097 | $3.39M | 0.00% | −18,028−12.4% | Reduced |
| Raymond James Financial Inc | 118,187 | $3.15M | 0.00% | +1,068+0.9% | Added |
| Two Sigma Investments, LP | 98,678 | $2.63M | 0.00% | +18,548+23.1% | Added |
| Legal & General Group Plc | 97,614 | $2.60M | 0.00% | −3,540−3.5% | Reduced |
| New York State Common Retirement Fund | 90,169 | $2.40M | 0.00% | +41,800+86.4% | Added |
| Rhumbline Advisers | 90,129 | $2.40M | 0.00% | −5,158−5.4% | Reduced |
| Jefferies Financial Group Inc. | 89,233 | $2.38M | 0.02% | +89,233 | New |
| HRT Financial LP | 77,746 | $2.07M | 0.01% | +35,666+84.8% | Added |
| Nuveen, LLC | 77,703 | $2.07M | 0.00% | −3,439−4.2% | Reduced |
| LSV Asset Management | 73,300 | $1.95M | 0.00% | +30,100+69.7% | Added |
| Swiss National Bank | 72,600 | $1.93M | 0.00% | 00.0% | Unchanged |
| O'Shaughnessy Asset Management, LLC | 69,058 | $1.84M | 0.01% | +28,749+71.3% | Added |
| Barclays PLC | 66,494 | $1.77M | 0.00% | −15,593−19.0% | Reduced |
| CX Institutional | 63,316 | $1.69M | 0.05% | −199,967−76.0% | Reduced |
| AQR Capital Management LLC | 62,145 | $1.66M | 0.00% | −13,700−18.1% | Reduced |
| Assetmark, Inc | 56,487 | $1.51M | 0.00% | +12,721+29.1% | Added |
| Steel Peak Wealth Management LLC | 55,695 | $1.48M | 0.05% | −100−0.2% | Reduced |
| Creative Planning | 55,115 | $1.47M | 0.00% | +12,495+29.3% | Added |
| UBS Asset Management Americas Inc | 54,335 | $1.45M | 0.00% | −39,317−42.0% | Reduced |
| Intech Investment Management LLC | 51,160 | $1.36M | 0.01% | +89+0.2% | Added |
| Alliancebernstein L.P. | 50,630 | $1.35M | 0.00% | 00.0% | Unchanged |
| Royal Bank of Canada | 49,671 | $1.32M | 0.00% | −269,046−84.4% | Reduced |
| Squarepoint Ops LLC | 49,310 | $1.31M | 0.00% | +26,284+114.1% | Added |
| Prudential Financial Inc | 47,429 | $1.26M | 0.00% | +5,478+13.1% | Added |
| Quantedge Capital Pte Ltd | 45,100 | $1.20M | 0.66% | +45,100 | New |
| Acadian Asset Management LLC | 44,349 | $1.18M | 0.00% | +44,349 | New |
| Campbell & CO Investment Adviser LLC | 44,068 | $1.17M | 0.09% | +21,635+96.4% | Added |
| Susquehanna Portfolio Strategies, LLC | 39,564 | $1.05M | 0.02% | 00.0% | Unchanged |
| SummerHaven Investment Management, LLC | 38,200 | $1.02M | 0.59% | +38,200 | New |
| Legato Capital Management LLC | 36,060 | $961.0K | 0.10% | 00.0% | Unchanged |
| Arkadios Wealth Advisors | 36,008 | $959.6K | 0.02% | +845+2.4% | Added |
| California State Teachers Retirement System | 35,879 | $956.2K | 0.00% | +20.0% | Added |
| Advisor Group Holdings, Inc. | 31,614 | $892.1K | 0.00% | +16,378+107.5% | Added |
| Man Group plc | 32,385 | $863.1K | 0.00% | +12,085+59.5% | Added |
| Great West Life Assurance Co | 30,216 | $813.0K | 0.00% | 00.0% | Unchanged |
| Quantbot Technologies LP | 29,763 | $793.2K | 0.02% | −31,192−51.2% | Reduced |
| Wells Fargo & Company | 28,751 | $766.2K | 0.00% | +4,355+17.9% | Added |
| Deutsche Bank AG | 28,396 | $756.8K | 0.00% | +3,218+12.8% | Added |
| Illumine Investment Management, LLC | 27,677 | $737.6K | 0.53% | +551+2.0% | Added |
| Thrivent Financial for Lutherans | 25,828 | $688.0K | 0.00% | −1,208−4.5% | Reduced |
| Advisor OS, LLC | 25,405 | $677.0K | 0.06% | 00.0% | Unchanged |
| Y-Intercept (Hong Kong) Ltd | 25,090 | $668.6K | 0.02% | +7,363+41.5% | Added |
| New York State Teachers Retirement System | 23,328 | $622.0K | 0.00% | −404−1.7% | Reduced |
| MetLife Investment Management | 23,093 | $615.4K | 0.00% | 00.0% | Unchanged |
| Danske Bank A/S | 23,043 | $614.1K | 0.00% | −6,855−22.9% | Reduced |
| Two Sigma Advisers, LP | 22,800 | $607.6K | 0.00% | −72,400−76.1% | Reduced |
| Envestnet Asset Management Inc | 21,975 | $585.6K | 0.00% | +21,975 | New |
| Lighthouse Investment Partners, LLC | 21,600 | $575.6K | 0.02% | +21,600 | New |
| State of Wisconsin Investment Board | 21,334 | $568.6K | 0.00% | −3,998−15.8% | Reduced |
| State of Alaska, Department of Revenue | 20,788 | $553.0K | 0.01% | −1,104−5.0% | Reduced |
| Illinois Municipal Retirement Fund | 20,747 | $552.9K | 0.01% | +810+4.1% | Added |
| Canada Pension Plan Investment Board | 20,700 | $551.7K | 0.00% | +16,500+392.9% | Added |
| DekaBank Deutsche Girozentrale | 20,848 | $550.0K | 0.00% | 00.0% | Unchanged |