Amphastar PharmaceuticalsAMPH
13F holders, Q1 2025 (March 31)241holders −22
29new positions
49sold out
7famous investors
$28.99avg. 13F price*
At the end of Q1 2025, 241 institutions reported holding Amphastar Pharmaceuticals Inc. (AMPH) in their 13F filings, down 22 from Q4 2024. 29 opened new positions and 49 sold out. The largest holders were BlackRock, Inc. ($178.2M), Vanguard Group Inc. ($70.2M) and TD Asset Management Inc ($64.1M). 7 famous investors held it, including Israel Englander (0.0% of Millennium Management's portfolio), Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio) and Paul Tudor Jones (0.0% of Tudor Investment Corporation's portfolio).
- Company
- Amphastar Pharmaceuticals Inc.
- CUSIP
- 03209R103
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2024 → Q1 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 29 | $30.2M |
| Exits | 49 | $90.3M |
All 13F filers, Q4 2024 → Q1 2025: 4,286,981 shares bought and 5,850,502 shares sold, net −1,563,521 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 241 holders
| BlackRock, Inc. | 0.00% | Add +0.5% | 6,147,658 | $178.2M |
| Vanguard Group Inc. | 0.00% | Reduce -10.8% | 2,422,904 | $70.2M |
| TD Asset Management Inc | 0.06% | Add +20.2% | 2,212,142 | $64.1M |
| State Street Corp. | 0.00% | Add +0.5% | 1,604,614 | $46.5M |
| Dimensional Fund Advisors LP | 0.01% | Add +13.2% | 1,356,360 | $39.3M |
| Fuller & Thaler Asset Management, Inc. | 0.14% | Add +11.5% | 1,263,598 | $36.6M |
| Epoch Investment Partners, Inc. | 0.19% | Add +14.5% | 1,261,307 | $36.6M |
| Boston Trust Walden Corp | 0.26% | Add +24.2% | 1,215,624 | $35.2M |
| Marshall Wace, LLP | 0.04% | Add +69.5% | 1,031,722 | $29.9M |
| Geode Capital Management, LLC | 0.00% | Add +4.3% | 955,076 | $27.7M |
| Millennium Management | 0.03% | Add +238.5% | 868,551 | $25.2M |
| Northern Trust Corp. | 0.00% | Reduce -3.1% | 594,437 | $17.2M |
| Federated Hermes, Inc. | 0.04% | Reduce -28.9% | 585,115 | $17.0M |
| T. Rowe Price Associates Inc. | 0.00% | Reduce -4.5% | 541,221 | $15.7M |
| Morgan Stanley | 0.00% | Reduce -17.4% | 522,112 | $15.1M |
| Renaissance Technologies | 0.02% | Reduce -5.8% | 495,000 | $14.4M |
| Pacer Advisors, Inc. | 0.04% | Reduce -64.5% | 479,390 | $13.9M |
| Boston Partners | 0.01% | Reduce -0.8% | 423,070 | $11.9M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -4.9% | 406,712 | $11.8M |
| Granite Investment Partners, LLC | 0.55% | Reduce -5.3% | 375,778 | $10.9M |
| Invesco Ltd. | 0.00% | Add +20.2% | 359,143 | $10.4M |
| ExodusPoint Capital Management, LP | 0.13% | New | 343,292 | $10.0M |
| Systematic Financial Management LP | 0.27% | Add +32.5% | 326,546 | $9.5M |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -6.1% | 326,226 | $9.5M |
| American Century Companies Inc. | 0.01% | Reduce -34.8% | 307,993 | $8.9M |
| Hotchkis & Wiley Capital Management LLC | 0.03% | Add +13.7% | 270,150 | $7.8M |
| Bank of New York Mellon Corp | 0.00% | Reduce -6.9% | 266,075 | $7.7M |
| Qube Research & Technologies Ltd | 0.01% | Add +124.6% | 258,981 | $7.5M |
| Royce & Associates LP | 0.08% | Add +2684.3% | 247,858 | $7.2M |
| Voloridge Investment Management, LLC | 0.02% | Add +50.6% | 216,002 | $6.3M |
| Principal Financial Group Inc. | 0.00% | Add +2.2% | 212,647 | $6.2M |
| Silvercrest Asset Management Group LLC | 0.03% | Reduce -0.6% | 165,856 | $4.8M |
| Balyasny Asset Management L.P. | 0.01% | New | 162,138 | $4.7M |
| Citadel Advisors | 0.00% | Add +11.1% | 155,979 | $4.5M |
| Ameriprise Financial Inc. | 0.00% | Add +6.3% | 155,146 | $4.5M |
| Nordea Investment Management AB | 0.00% | Reduce -46.0% | 150,932 | $4.3M |
| Lam Group, Inc. | 2.79% | No change | 130,800 | $3.8M |
| Janus Henderson Group PLC | 0.00% | Reduce -34.3% | 124,402 | $3.5M |
| Frontier Capital Management Co. LLC | 0.04% | Reduce -3.0% | 119,628 | $3.5M |
| Public Sector Pension Investment Board | 0.01% | Add +27.2% | 118,885 | $3.4M |
| Bridge City Capital, LLC | 1.01% | Add +65.3% | 115,855 | $3.4M |
| Susquehanna Fundamental Investments, LLC | 0.06% | New | 115,086 | $3.3M |
| Bank of America Corp. | 0.00% | Reduce -4.8% | 106,690 | $3.1M |
| Legal & General Group Plc | 0.00% | Reduce -2.1% | 101,576 | $2.9M |
| Nuveen, LLC | 0.00% | — | 95,665 | $2.8M |
| Trexquant Investment LP | 0.03% | Reduce -13.5% | 91,291 | $2.6M |
| UBS Group AG | 0.00% | Reduce -41.9% | 89,324 | $2.6M |
| Rhumbline Advisers | 0.00% | Add +1.9% | 88,958 | $2.6M |
| HRT Financial LP | 0.02% | New | 86,364 | $2.5M |
| Two Sigma Advisers, LP | 0.01% | Reduce -1.4% | 84,700 | $2.5M |
| CX Institutional | 0.09% | New | 82,147 | $2.4M |
| New York State Common Retirement Fund | 0.00% | Add +15.7% | 81,565 | $2.4M |
| Victory Capital Management Inc. | 0.00% | Add +27.9% | 81,087 | $2.4M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Reduce -5.0% | 79,089 | $2.3M |
| Citigroup Inc. | 0.00% | Add +23.1% | 77,737 | $2.3M |
| Two Sigma Investments, LP | 0.01% | Reduce -23.3% | 75,328 | $2.2M |
| Swiss National Bank | 0.00% | Reduce -2.5% | 74,500 | $2.2M |
| Susquehanna International Group, LLP | 0.00% | Add +126.2% | 70,709 | $2.0M |
| Squarepoint Ops LLC | 0.01% | Add +295.0% | 69,770 | $2.0M |
| Barclays PLC | 0.00% | Reduce -21.0% | 66,952 | $1.9M |
| JPMorgan Chase & Co. | 0.00% | Reduce -56.5% | 66,880 | $1.9M |
| Intech Investment Management LLC | 0.02% | Add +43.0% | 60,289 | $1.7M |
| Prudential Financial Inc. | 0.00% | Reduce -2.8% | 37,614 | $1.7M |
| SteelPeak Wealth, LLC | 0.07% | New | 55,795 | $1.6M |
| Aurora Investment Counsel | 0.87% | Reduce -1.1% | 54,081 | $1.6M |
| AQR Capital Management | 0.00% | Add +82.0% | 53,638 | $1.6M |
| Alliancebernstein L.P. | 0.00% | No change | 50,630 | $1.5M |
| Jane Street Group, LLC | 0.00% | Reduce -53.1% | 46,665 | $1.4M |
| Campbell & CO Investment Adviser LLC | 0.10% | Reduce -3.7% | 45,789 | $1.3M |
| Gsa Capital Partners LLP | 0.12% | Add +159.8% | 45,297 | $1.3M |
| Twinbeech Capital LP | 0.02% | Reduce -6.0% | 43,986 | $1.3M |
| LSV Asset Management | 0.00% | Add +18.7% | 43,200 | $1.3M |
| Assetmark, Inc. | 0.00% | Reduce -3.3% | 40,537 | $1.2M |
| Engineers Gate Manager LP | 0.02% | Add +32.4% | 38,545 | $1.1M |
| Man Group plc | 0.00% | Add +75.2% | 38,237 | $1.1M |
| California State Teachers Retirement System | 0.00% | No change | 36,369 | $1.1M |
| Numerai GP LLC | 0.19% | New | 34,006 | $986K |
| Arkadios Wealth Advisors | 0.04% | Add +21.5% | 33,966 | $985K |
| Aristeia Capital, L.L.C. | 0.06% | Reduce -21.7% | 33,835 | $981K |
| Connor, Clark & Lunn Investment Management Ltd. | 0.00% | Reduce -52.1% | 32,241 | $935K |
| Hussman Strategic Advisors, Inc. | 0.22% | New | 31,500 | $913K |
| CANADA LIFE ASSURANCE Co | 0.00% | Reduce -10.8% | 31,262 | $907K |
| Deutsche Bank AG | 0.00% | Reduce -9.3% | 30,910 | $896K |
| Polaris Capital Management, LLC | 0.05% | Add +25.7% | 30,800 | $893K |
| Legato Capital Management LLC | 0.12% | Add +60.9% | 29,699 | $861K |
| Raymond James Financial Inc. | 0.00% | Reduce -68.1% | 29,672 | $860K |
| Wells Fargo & Company | 0.00% | Add +24.7% | 29,361 | $851K |
| D. E. Shaw & Co. | 0.00% | Reduce -75.4% | 29,188 | $846K |
| Thrivent Financial for Lutherans | 0.00% | Reduce -5.0% | 27,547 | $799K |
| Illumine Investment Management, LLC | 0.63% | Add +55.6% | 26,530 | $769K |
| Graham Capital Management, L.P. | 0.04% | New | 26,424 | $766K |
| Royal Bank of Canada | 0.00% | Reduce -8.9% | 26,079 | $756K |
| State of Wisconsin Investment Board | 0.00% | Reduce -0.2% | 25,592 | $742K |
| Advisor OS, LLC | 0.08% | No change | 25,405 | $736K |
| Martingale Asset Management L P | 0.02% | Reduce -39.0% | 24,542 | $711K |
| New York State Teachers Retirement System | 0.00% | No change | 23,866 | $692K |
| MetLife Investment Management, LLC | 0.00% | Reduce -1.5% | 23,093 | $669K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Add +2.8% | 22,489 | $652K |
| Tudor Investment Corporation | 0.01% | New | 21,793 | $632K |
| Quantbot Technologies LP | 0.02% | Reduce -17.1% | 21,109 | $612K |
"% of holder's portfolio" is AMPH's weight in each manager's 13F, not the share of Amphastar Pharmaceuticals Inc. the manager owns.