Amphastar PharmaceuticalsAMPH
13F holders, Q3 2025 (September 30)243holders −2
34new positions
34sold out
6famous investors
$26.65avg. 13F price*
At the end of Q3 2025, 243 institutions reported holding Amphastar Pharmaceuticals Inc. (AMPH) in their 13F filings, down 2 from Q2 2025. 34 opened new positions and 34 sold out. The largest holders were BlackRock, Inc. ($146.2M), Vanguard Group Inc. ($70.1M) and TD Asset Management Inc ($51.5M). 6 famous investors held it, including Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio), Israel Englander (0.0% of Millennium Management's portfolio) and David E. Shaw (0.0% of D. E. Shaw & Co.'s portfolio).
- Company
- Amphastar Pharmaceuticals Inc.
- CUSIP
- 03209R103
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q2 2025 → Q3 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 34 | $25.5M |
| Exits | 34 | $21.3M |
All 13F filers, Q2 2025 → Q3 2025: 3,631,431 shares bought and 3,600,994 shares sold, net +30,437 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 243 holders
| BlackRock, Inc. | 0.00% | Reduce -3.2% | 5,485,057 | $146.2M |
| Vanguard Group Inc. | 0.00% | Reduce -2.1% | 2,631,040 | $70.1M |
| TD Asset Management Inc | 0.04% | Reduce -5.1% | 1,931,892 | $51.5M |
| Dimensional Fund Advisors LP | 0.01% | Add +7.9% | 1,755,665 | $46.8M |
| State Street Corp. | 0.00% | Reduce -4.8% | 1,500,742 | $40.0M |
| Fuller & Thaler Asset Management, Inc. | 0.12% | Add +7.1% | 1,353,927 | $36.1M |
| Boston Trust Walden Corp | 0.23% | Reduce -0.3% | 1,173,107 | $31.3M |
| Epoch Investment Partners, Inc. | 0.17% | Reduce -8.7% | 1,133,986 | $30.2M |
| Geode Capital Management, LLC | 0.00% | Reduce -5.2% | 922,577 | $24.6M |
| Marshall Wace, LLP | 0.03% | Add +3.0% | 874,068 | $23.3M |
| Millennium Management | 0.02% | Add +12.7% | 697,765 | $18.6M |
| Renaissance Technologies | 0.02% | Add +1.8% | 586,900 | $15.6M |
| Morgan Stanley | 0.00% | Reduce -15.6% | 574,679 | $15.3M |
| D. E. Shaw & Co. | 0.01% | Add +76.0% | 517,222 | $13.8M |
| Systematic Financial Management LP | 0.27% | Add +17.8% | 423,112 | $11.3M |
| Northern Trust Corp. | 0.00% | Reduce -5.1% | 399,470 | $10.6M |
| Algert Global LLC | 0.18% | Add +216.1% | 392,902 | $10.5M |
| Arrowstreet Capital, Limited Partnership | 0.01% | Add +382.9% | 392,310 | $10.5M |
| Invesco Ltd. | 0.00% | Add +0.7% | 389,593 | $10.4M |
| Royce & Associates LP | 0.10% | Add +29.4% | 366,322 | $9.8M |
| Charles Schwab Investment Management Inc. | 0.00% | Add +2.8% | 356,409 | $9.5M |
| Hotchkis & Wiley Capital Management LLC | 0.03% | Reduce -10.9% | 326,183 | $8.7M |
| Bridgeway Capital Management, LLC | 0.18% | Add +267.0% | 312,337 | $8.3M |
| UBS Group AG | 0.00% | Add +367.2% | 312,274 | $8.3M |
| Voloridge Investment Management, LLC | 0.03% | Reduce -10.2% | 292,443 | $7.8M |
| American Century Companies Inc. | 0.00% | Add +23.8% | 288,585 | $7.7M |
| Clark Capital Management Group, Inc. | 0.05% | New | 283,674 | $7.6M |
| T. Rowe Price Associates Inc. | 0.00% | Add +0.7% | 275,222 | $7.3M |
| Bank of New York Mellon Corp | 0.00% | Reduce -14.9% | 267,828 | $7.1M |
| JPMorgan Chase & Co. | 0.00% | Add +60.2% | 253,232 | $6.7M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -32.3% | 241,228 | $6.4M |
| Qube Research & Technologies Ltd | 0.01% | Reduce -48.6% | 241,212 | $6.4M |
| Citadel Advisors | 0.00% | Reduce -22.4% | 226,775 | $6.0M |
| BNP Paribas Financial Markets | 0.00% | Add +209.7% | 222,019 | $5.9M |
| Victory Capital Management Inc. | 0.00% | Add +175.6% | 211,800 | $5.6M |
| Principal Financial Group Inc. | 0.00% | Reduce -6.1% | 205,678 | $5.5M |
| Nordea Investment Management AB | 0.00% | Add +0.9% | 153,351 | $4.1M |
| First Trust Advisors LP | 0.00% | Add +59.5% | 150,422 | $4.0M |
| Empowered Funds, LLC | 0.04% | Add +76.0% | 149,795 | $4.0M |
| Jane Street Group, LLC | 0.00% | Reduce -7.3% | 148,459 | $4.0M |
| Balyasny Asset Management L.P. | 0.01% | Reduce -46.7% | 141,852 | $3.8M |
| Public Sector Pension Investment Board | 0.01% | Add +11.4% | 139,675 | $3.7M |
| Bridge City Capital, LLC | 0.97% | Reduce -1.7% | 136,258 | $3.6M |
| Denali Advisors LLC | 0.41% | New | 135,000 | $3.6M |
| Lam Group, Inc. | 2.16% | No change | 130,800 | $3.5M |
| Ameriprise Financial Inc. | 0.00% | Reduce -23.6% | 129,841 | $3.5M |
| Rice Hall James & Associates, LLC | 0.19% | New | 129,339 | $3.4M |
| Bank of America Corp. | 0.00% | Reduce -12.4% | 127,097 | $3.4M |
| Raymond James Financial Inc. | 0.00% | Add +0.9% | 118,187 | $3.1M |
| Two Sigma Investments, LP | 0.00% | Add +23.1% | 98,678 | $2.6M |
| Legal & General Group Plc | 0.00% | Reduce -3.5% | 97,614 | $2.6M |
| New York State Common Retirement Fund | 0.00% | Add +86.4% | 90,169 | $2.4M |
| Rhumbline Advisers | 0.00% | Reduce -5.4% | 90,129 | $2.4M |
| Jefferies Financial Group Inc. | 0.02% | New | 89,233 | $2.4M |
| HRT Financial LP | 0.01% | Add +84.8% | 77,746 | $2.1M |
| Nuveen, LLC | 0.00% | Reduce -4.2% | 77,703 | $2.1M |
| LSV Asset Management | 0.00% | Add +69.7% | 73,300 | $2.0M |
| Swiss National Bank | 0.00% | No change | 72,600 | $1.9M |
| O'shaughnessy Asset Management, LLC | 0.01% | Add +71.3% | 69,058 | $1.8M |
| Barclays PLC | 0.00% | Reduce -19.0% | 66,494 | $1.8M |
| CX Institutional | 0.05% | Reduce -76.0% | 63,316 | $1.7M |
| AQR Capital Management | 0.00% | Reduce -18.1% | 62,145 | $1.7M |
| Assetmark, Inc. | 0.00% | Add +29.1% | 56,487 | $1.5M |
| SteelPeak Wealth, LLC | 0.05% | Reduce -0.2% | 55,695 | $1.5M |
| Creative Planning | 0.00% | Add +29.3% | 55,115 | $1.5M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Reduce -42.0% | 54,335 | $1.4M |
| Intech Investment Management LLC | 0.01% | Add +0.2% | 51,160 | $1.4M |
| Alliancebernstein L.P. | 0.00% | No change | 50,630 | $1.3M |
| Royal Bank of Canada | 0.00% | Reduce -84.4% | 49,671 | $1.3M |
| Squarepoint Ops LLC | 0.00% | Add +114.2% | 49,310 | $1.3M |
| Prudential Financial Inc. | 0.00% | Add +13.1% | 47,429 | $1.3M |
| Quantedge Capital Pte Ltd | 0.66% | New | 45,100 | $1.2M |
| Acadian Asset Management LLC | 0.00% | New | 44,349 | $1.2M |
| Campbell & CO Investment Adviser LLC | 0.09% | Add +96.4% | 44,068 | $1.2M |
| Susquehanna Portfolio Strategies, LLC | 0.02% | No change | 39,564 | $1.1M |
| SummerHaven Investment Management, LLC | 0.59% | New | 38,200 | $1.0M |
| Legato Capital Management LLC | 0.10% | No change | 36,060 | $961K |
| Arkadios Wealth Advisors | 0.02% | Add +2.4% | 36,008 | $960K |
| California State Teachers Retirement System | 0.00% | Add +0.0% | 35,879 | $956K |
| Osaic Holdings, Inc. | 0.00% | Add +107.5% | 31,614 | $892K |
| Man Group plc | 0.00% | Add +59.5% | 32,385 | $863K |
| CANADA LIFE ASSURANCE Co | 0.00% | No change | 30,216 | $813K |
| Quantbot Technologies LP | 0.02% | Reduce -51.2% | 29,763 | $793K |
| Wells Fargo & Company | 0.00% | Add +17.9% | 28,751 | $766K |
| Deutsche Bank AG | 0.00% | Add +12.8% | 28,396 | $757K |
| Illumine Investment Management, LLC | 0.53% | Add +2.0% | 27,677 | $738K |
| Thrivent Financial for Lutherans | 0.00% | Reduce -4.5% | 25,828 | $688K |
| Advisor OS, LLC | 0.06% | No change | 25,405 | $677K |
| Y-Intercept (Hong Kong) Ltd | 0.02% | Add +41.5% | 25,090 | $669K |
| New York State Teachers Retirement System | 0.00% | Reduce -1.7% | 23,328 | $622K |
| MetLife Investment Management, LLC | 0.00% | No change | 23,093 | $615K |
| Danske Bank A/S | 0.00% | Reduce -22.9% | 23,043 | $614K |
| Two Sigma Advisers, LP | 0.00% | Reduce -76.0% | 22,800 | $608K |
| Envestnet Asset Management Inc. | 0.00% | New | 21,975 | $586K |
| Lighthouse Investment Partners, LLC | 0.02% | New | 21,600 | $576K |
| State of Wisconsin Investment Board | 0.00% | Reduce -15.8% | 21,334 | $569K |
| State of Alaska, Department of Revenue | 0.01% | Reduce -5.0% | 20,788 | $553K |
| Illinois Municipal Retirement Fund | 0.01% | Add +4.1% | 20,747 | $553K |
| Canada Pension Plan Investment Board | 0.00% | Add +392.9% | 20,700 | $552K |
| DekaBank Deutsche Girozentrale | 0.00% | No change | 20,848 | $550K |
"% of holder's portfolio" is AMPH's weight in each manager's 13F, not the share of Amphastar Pharmaceuticals Inc. the manager owns.