Amphastar PharmaceuticalsAMPH
13F holders, Q1 2026 (March 31)215holders −21
21new positions
44sold out
5famous investors
$19.60avg. 13F price*
At the end of Q1 2026, 215 institutions reported holding Amphastar Pharmaceuticals Inc. (AMPH) in their 13F filings, down 21 from Q4 2025. 21 opened new positions and 44 sold out. The largest holders were BlackRock, Inc. ($106.2M), Dimensional Fund Advisors LP ($39.7M) and State Street Corp. ($31.5M). 5 famous investors held it, including Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio), David E. Shaw (0.0% of D. E. Shaw & Co.'s portfolio) and Israel Englander (0.0% of Millennium Management's portfolio).
- Company
- Amphastar Pharmaceuticals Inc.
- CUSIP
- 03209R103
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 21 | $6.9M |
| Exits | 44 | $37.5M |
All 13F filers, Q4 2025 → Q1 2026: 3,159,574 shares bought and 4,309,101 shares sold, net −1,149,527 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 215 holders
| BlackRock, Inc. | 0.00% | Reduce -0.7% | 5,421,343 | $106.2M |
| Dimensional Fund Advisors LP | 0.01% | Add +12.7% | 2,027,947 | $39.7M |
| State Street Corp. | 0.00% | Add +4.9% | 1,607,515 | $31.5M |
| Vanguard Capital Management LLC | 0.00% | — | 1,543,655 | $30.2M |
| TD Asset Management Inc | 0.02% | Reduce -21.5% | 1,541,044 | $30.2M |
| Fuller & Thaler Asset Management, Inc. | 0.09% | Add +0.1% | 1,395,139 | $27.3M |
| Marshall Wace, LLP | 0.02% | Reduce -17.1% | 1,025,640 | $20.1M |
| American Century Companies Inc. | 0.01% | Add +52.9% | 1,017,538 | $19.9M |
| Geode Capital Management, LLC | 0.00% | Add +10.1% | 976,650 | $19.1M |
| Boston Trust Walden Corp | 0.15% | Reduce -13.1% | 944,789 | $18.5M |
| Epoch Investment Partners, Inc. | 0.11% | Reduce -20.2% | 898,895 | $17.6M |
| Vanguard Portfolio Management LLC | 0.00% | — | 787,816 | $15.4M |
| D. E. Shaw & Co. | 0.01% | Add +19.5% | 665,542 | $13.0M |
| LSV Asset Management | 0.03% | Add +490.9% | 651,714 | $12.8M |
| Invesco Ltd. | 0.00% | Add +20.6% | 604,774 | $11.8M |
| Renaissance Technologies | 0.02% | Add +1.7% | 553,900 | $10.9M |
| Systematic Financial Management LP | 0.20% | Add +4.0% | 452,898 | $8.9M |
| Morgan Stanley | 0.00% | Reduce -28.9% | 420,337 | $8.2M |
| UBS Group AG | 0.00% | Add +63.8% | 420,263 | $8.2M |
| Royce & Associates LP | 0.08% | Add +15.3% | 406,175 | $8.0M |
| Northern Trust Corp. | 0.00% | Add +0.2% | 372,279 | $7.3M |
| Millennium Management | 0.01% | Add +27.8% | 371,373 | $7.3M |
| Bridge City Capital, LLC | 1.82% | Add +42.3% | 335,105 | $6.6M |
| Bridgeway Capital Management, LLC | 0.13% | Add +2.1% | 330,457 | $6.5M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -40.8% | 329,388 | $6.5M |
| Arrowstreet Capital, Limited Partnership | 0.00% | Reduce -41.9% | 325,291 | $6.4M |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -8.5% | 321,039 | $6.3M |
| Denali Advisors LLC | 0.58% | Add +25.8% | 266,465 | $5.2M |
| Pacer Advisors, Inc. | 0.01% | Add +47.1% | 261,483 | $5.1M |
| Victory Capital Management Inc. | 0.00% | Reduce -18.2% | 249,617 | $4.9M |
| Bank of New York Mellon Corp | 0.00% | Reduce -6.1% | 243,226 | $4.8M |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 231,044 | $4.5M |
| Principal Financial Group Inc. | 0.00% | Reduce -4.1% | 209,131 | $4.1M |
| Rice Hall James & Associates, LLC | 0.20% | Add +54.6% | 187,348 | $3.7M |
| Empowered Funds, LLC | 0.02% | Add +9.3% | 181,332 | $3.6M |
| Bank of America Corp. | 0.00% | Add +36.0% | 174,323 | $3.4M |
| Voloridge Investment Management, LLC | 0.01% | Reduce -26.0% | 171,188 | $3.4M |
| BNP Paribas Financial Markets | 0.00% | Add +29.1% | 156,077 | $3.1M |
| First Trust Advisors LP | 0.00% | Add +7.3% | 150,591 | $3.0M |
| New York State Common Retirement Fund | 0.00% | Add +18.1% | 148,722 | $2.9M |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 0.00% | Add +379.0% | 139,402 | $2.7M |
| Franklin Resources Inc. | 0.00% | Add +434.9% | 139,305 | $2.7M |
| Two Sigma Investments, LP | 0.00% | Add +40.0% | 138,148 | $2.7M |
| Lam Group, Inc. | 1.41% | No change | 130,800 | $2.6M |
| Public Sector Pension Investment Board | 0.01% | Add +3.3% | 126,574 | $2.5M |
| Nordea Investment Management AB | 0.00% | Reduce -4.1% | 123,824 | $2.4M |
| Bessemer Group Inc. | 0.00% | Add +1.0% | 122,046 | $2.4M |
| O'shaughnessy Asset Management, LLC | 0.01% | Add +19.2% | 103,929 | $2.0M |
| JPMorgan Chase & Co. | 0.00% | Reduce -34.1% | 104,574 | $2.0M |
| Jane Street Group, LLC | 0.00% | Reduce -57.5% | 92,475 | $1.8M |
| XTX Topco Ltd | 0.03% | Add +80.5% | 87,736 | $1.7M |
| Rhumbline Advisers | 0.00% | Add +1.6% | 83,721 | $1.6M |
| Exchange Traded Concepts, LLC | 0.01% | Add +775.1% | 82,416 | $1.6M |
| Legal & General Group Plc | 0.00% | Reduce -10.8% | 80,916 | $1.6M |
| AQR Capital Management | 0.00% | Add +16.4% | 78,778 | $1.5M |
| Ameriprise Financial Inc. | 0.00% | Reduce -41.1% | 78,775 | $1.5M |
| Alliancebernstein L.P. | 0.00% | Reduce -6.9% | 56,430 | $1.5M |
| Nuveen, LLC | 0.00% | Add +0.7% | 76,595 | $1.5M |
| Swiss National Bank | 0.00% | No change | 72,600 | $1.4M |
| Robeco Institutional Asset Management B.V. | 0.00% | New | 66,407 | $1.3M |
| Citadel Advisors | 0.00% | Reduce -71.3% | 65,540 | $1.3M |
| Hussman Strategic Advisors, Inc. | 0.27% | New | 63,000 | $1.2M |
| Algert Global LLC | 0.02% | Reduce -50.2% | 62,360 | $1.2M |
| HRT Financial LP | 0.00% | New | 56,181 | $1.1M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Add +0.3% | 55,375 | $1.1M |
| Assetmark, Inc. | 0.00% | Reduce -1.1% | 53,738 | $1.1M |
| Prudential Financial Inc. | 0.00% | Add +7.4% | 50,693 | $993K |
| Vanguard Global Advisers, LLC | 0.00% | — | 50,163 | $983K |
| SteelPeak Wealth, LLC | 0.03% | Reduce -13.0% | 48,462 | $949K |
| Trexquant Investment LP | 0.01% | Reduce -57.9% | 47,867 | $938K |
| T. Rowe Price Associates Inc. | 0.00% | Add +22.0% | 44,903 | $880K |
| Polaris Capital Management, LLC | 0.07% | Add +21.7% | 43,232 | $847K |
| Wells Fargo & Company | 0.00% | Reduce -7.3% | 42,019 | $823K |
| HSBC Holdings PLC | 0.00% | New | 38,017 | $753K |
| Man Group plc | 0.00% | Add +163.4% | 37,274 | $730K |
| Citigroup Inc. | 0.00% | Add +27.0% | 35,904 | $703K |
| Legato Capital Management LLC | 0.06% | Add +28.4% | 34,135 | $669K |
| Segall Bryant & Hamill, LLC | 0.01% | Add +197.9% | 33,318 | $653K |
| Deutsche Bank AG | 0.00% | Add +12.1% | 33,131 | $649K |
| SG Americas Securities, LLC | 0.00% | Reduce -64.9% | 32,806 | $643K |
| SummerHaven Investment Management, LLC | 0.39% | Reduce -14.6% | 32,633 | $639K |
| Quadrature Capital Ltd | 0.01% | New | 30,561 | $599K |
| CANADA LIFE ASSURANCE Co | 0.00% | No change | 30,216 | $593K |
| Freestone Grove Partners LP | 0.00% | Add +8.2% | 29,857 | $585K |
| Squarepoint Ops LLC | 0.00% | Add +90.8% | 28,345 | $555K |
| California State Teachers Retirement System | 0.00% | Reduce -20.9% | 28,299 | $554K |
| Illumine Investment Management, LLC | 0.42% | Reduce -0.9% | 28,078 | $550K |
| State of Alaska, Department of Revenue | 0.01% | Reduce -1.8% | 27,410 | $536K |
| Advisor OS, LLC | 0.04% | No change | 25,405 | $498K |
| Advisory Research Inc. | 0.06% | Add +67.1% | 25,335 | $496K |
| Intech Investment Management LLC | 0.00% | Reduce -61.7% | 24,207 | $474K |
| Thrivent Financial for Lutherans | 0.00% | Reduce -2.9% | 23,618 | $463K |
| Vident Advisory, LLC | 0.00% | Add +13.9% | 23,244 | $455K |
| VANGUARD ASSET MANAGEMENT, Ltd | 0.00% | — | 23,052 | $452K |
| New York State Teachers Retirement System | 0.00% | Reduce -5.0% | 21,825 | $428K |
| Barclays PLC | 0.00% | Reduce -71.7% | 21,283 | $417K |
| MetLife Investment Management, LLC | 0.00% | Reduce -1.5% | 20,761 | $407K |
| Round Rock Advisors LLC | 0.06% | Add +0.1% | 20,495 | $401K |
| Illinois Municipal Retirement Fund | 0.00% | Reduce -6.6% | 19,528 | $383K |
| Raymond James Financial Inc. | 0.00% | Reduce -77.4% | 19,055 | $373K |
| Verition Fund Management LLC | 0.00% | New | 18,597 | $364K |
| Envestnet Asset Management Inc. | 0.00% | Reduce -36.6% | 18,268 | $358K |
| nVerses Capital, LLC | 0.31% | New | 17,685 | $346K |
| State of Wisconsin Investment Board | 0.00% | Reduce -0.7% | 17,388 | $341K |
| Janus Henderson Group PLC | 0.00% | No change | 16,868 | $331K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Reduce -0.2% | 16,846 | $330K |
| Creative Planning | 0.00% | Reduce -68.3% | 16,403 | $321K |
| Canada Pension Plan Investment Board | 0.00% | Reduce -45.3% | 16,300 | $319K |
| Manufacturers Life Insurance Company, The | 0.00% | Reduce -3.2% | 15,879 | $311K |
| Louisiana State Employees Retirement System | 0.01% | Reduce -3.1% | 15,700 | $308K |
| Assenagon Asset Management S.A. | 0.00% | No change | 15,216 | $298K |
| Susquehanna International Group, LLP | 0.00% | Add +79.5% | 14,601 | $286K |
| Federated Hermes, Inc. | 0.00% | Reduce -40.2% | 14,079 | $276K |
| Janney Montgomery Scott LLC | 0.00% | Reduce -2.9% | 13,817 | $271K |
| Quantedge Capital Pte Ltd | 0.14% | Reduce -85.3% | 13,500 | $264K |
| Hohimer Wealth Management, LLC | 0.03% | New | 13,066 | $256K |
| Osaic Holdings, Inc. | 0.00% | Add +1.4% | 13,040 | $255K |
| State of New Jersey Common Pension Fund D | 0.00% | New | 12,564 | $246K |
| MML Investors Services, LLC | 0.00% | Reduce -15.7% | 12,367 | $242K |
| Brevan Howard Capital Management LP | 0.00% | Reduce -43.3% | 11,614 | $228K |
| Natixis Advisors, LLC | 0.00% | New | 11,510 | $225K |
| PDT Partners, LLC | 0.01% | New | 11,441 | $224K |
| Magnetar Financial LLC | 0.00% | New | 11,235 | $220K |
| Vestcor Inc | 0.01% | Reduce -33.2% | 10,949 | $214K |
| State Board of Administration of Florida Retirement System | 0.00% | No change | 10,913 | $214K |
| Profund Advisors LLC | 0.01% | Reduce -4.2% | 10,658 | $209K |
| Sterling Capital Management LLC | 0.00% | Reduce -37.5% | 10,385 | $203K |
| Vanguard Personalized Indexing Management, LLC | 0.00% | Reduce -1.6% | 10,290 | $202K |
| Police & Firemen's Retirement System of New Jersey | 0.00% | No change | 10,263 | $201K |
| Amalgamated Bank | 0.00% | Reduce -2.0% | 10,215 | $200K |
| Arizona State Retirement System | 0.00% | Reduce -3.2% | 10,098 | $198K |
| Teachers Retirement System of the State of Kentucky | 0.00% | No change | 9,053 | $178K |
| Fifth Third Bancorp | 0.00% | Add +1619.1% | 8,750 | $171K |
| State of Tennessee, Department of Treasury | 0.00% | No change | 8,619 | $169K |
| Vanguard Investments Australia, Ltd. | 0.00% | — | 8,567 | $168K |
| China Universal Asset Management Co., Ltd. | 0.01% | Add +7.5% | 8,051 | $158K |
| Oregon Public Employees Retirement Fund | 0.00% | Reduce -1.2% | 8,042 | $158K |
| KLP Kapitalforvaltning As | 0.00% | No change | 7,900 | $155K |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 0.00% | Add +3.7% | 7,783 | $152K |
| Corient IA LP | 0.12% | Reduce -11.1% | 6,670 | $131K |
| PNC Financial Services Group, Inc. | 0.00% | Reduce -6.2% | 5,449 | $107K |
| Public Employees Retirement Association of Colorado | 0.00% | No change | 5,265 | $103K |
| Basecamp Wealth Advisors LLC | 0.02% | Reduce -0.7% | 4,356 | $85K |
| Tower Research Capital LLC (TRC) | 0.00% | Add +119.3% | 3,918 | $77K |
| Royal Bank of Canada | 0.00% | Reduce -62.0% | 3,523 | $68K |
| Russell Investments Group, Ltd. | 0.00% | Reduce -7.6% | 3,445 | $67K |
| Ameritas Investment Partners, Inc. | 0.00% | No change | 3,101 | $61K |
| CX Institutional | 0.00% | Reduce -95.4% | 2,973 | $58K |
| TD Private Client Wealth LLC | 0.00% | Reduce -1.6% | 2,379 | $47K |
| Mirae Asset Global Investments Co., Ltd. | 0.00% | Add +6.0% | 2,366 | $46K |
| Hantz Financial Services, Inc. | 0.00% | Reduce -54.8% | 2,027 | $40K |
| Blue Trust, Inc. | 0.00% | Add +29.6% | 1,607 | $31K |
| FMR LLC | 0.00% | Reduce -63.3% | 1,294 | $25K |
| Farther Finance Advisors, LLC | 0.00% | Reduce -17.7% | 1,136 | $23K |
| Quadrant Capital Group LLC | 0.00% | Reduce -58.6% | 1,131 | $22K |
| GF Fund Management Co. LTD. | 0.00% | Add +13.5% | 1,024 | $20K |
| Vanguard National Trust Co | 0.00% | — | 886 | $17K |
| 1620 Investment Advisors, Inc. | 0.01% | No change | 718 | $14K |
| Cwm, LLC | 0.00% | Reduce -60.9% | 658 | $13K |
| Parallel Advisors, LLC | 0.00% | Add +866.2% | 657 | $13K |
| Public Employees Retirement System of Ohio | 0.00% | Add +15.9% | 589 | $12K |
| Signaturefd, LLC | 0.00% | Add +8.5% | 588 | $12K |
| Harbor Capital Advisors, Inc. | 0.00% | Add +44.3% | 391 | $8K |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 0.00% | Reduce -89.5% | 396 | $8K |
| MAI Capital Management | 0.00% | Add +3.6% | 371 | $7K |
| Nisa Investment Advisors, LLC | 0.00% | Reduce -41.8% | 361 | $7K |
| GAMMA Investing LLC | 0.00% | Reduce -79.9% | 339 | $7K |
| US Bancorp \de | 0.00% | Reduce -60.5% | 318 | $6K |
| Pinnacle Wealth Planning Services, Inc. | 0.00% | Reduce -82.5% | 283 | $6K |
| Jones Financial Companies LLLP | 0.00% | Reduce -45.8% | 288 | $5K |
| Smartleaf Asset Management LLC | 0.00% | Add +5.4% | 273 | $5K |
| Simplex Trading, LLC | 0.00% | New | 262 | $5K |
| MassMutual Private Wealth & Trust, FSB | 0.00% | Reduce -70.8% | 224 | $4K |
| Versant Capital Management, Inc | 0.00% | Reduce -39.8% | 218 | $4K |
| Los Angeles Capital Management LLC | 0.00% | Reduce -98.9% | 217 | $4K |
| Group One Trading LLC | 0.00% | Reduce -87.7% | 214 | $4K |
| Bank of New Hampshire | 0.00% | New | 206 | $4K |
| Spire Wealth Management | 0.00% | Reduce -3.3% | 206 | $4K |
| UMB Bank, n.a. | 0.00% | Reduce -28.0% | 180 | $4K |
| Twin Peaks Wealth Advisors, LLC | 0.00% | New | 177 | $3K |
| Parkside Financial Bank & Trust | 0.00% | Reduce -9.8% | 156 | $3K |
| Capital Advisors, Ltd. LLC | 0.00% | Add +1445.5% | 170 | $3K |
| City State Bank | 0.00% | No change | 150 | $3K |
| Rockefeller Capital Management L.P. | 0.00% | Add +24.0% | 124 | $2K |
| Essential Partners LLC | 0.00% | Reduce -39.5% | 121 | $2K |
| CoreCap Advisors, LLC | 0.00% | No change | 107 | $2K |
| MCF Advisors LLC | 0.00% | New | 100 | $2K |
| Steward Partners Investment Advisory, LLC | 0.00% | New | 100 | $2K |
| Truvestments Capital LLC | 0.00% | Reduce -37.7% | 96 | $2K |
| Arax Advisory Partners | 0.00% | Add +81.8% | 60 | $2K |
| IFP Advisors, Inc | 0.00% | Reduce -92.8% | 70 | $1K |
| WealthCollab, LLC | 0.00% | No change | 64 | $1K |
| HighMark Wealth Management LLC | 0.00% | No change | 55 | $1K |
| Covestor Ltd | 0.00% | Reduce -37.3% | 37 | $1K |
| Bare Financial Services, Inc | 0.00% | New | 46 | $901 |
| SBI Securities Co., Ltd. | 0.00% | Add +2.3% | 44 | $862 |
| Allworth Financial LP | 0.00% | Reduce -97.1% | 43 | $843 |
| Optiver Holding B.V. | 0.00% | Reduce -56.3% | 28 | $549 |
| Brown, Lisle/Cummings, Inc. | 0.00% | New | 27 | $529 |
| Farmers & Merchants Investments Inc. | 0.00% | No change | 25 | $490 |
| Picton Mahoney Asset Management | 0.00% | No change | 24 | $470 |
| EverSource Wealth Advisors, LLC | 0.00% | Reduce -73.3% | 24 | $470 |
| Sound Income Strategies, LLC | 0.00% | New | 23 | $466 |
| Legacy Wealth Managment, LLC | 0.00% | Reduce -64.4% | 21 | $412 |
| Larson Financial Group LLC | 0.00% | Reduce -97.4% | 20 | $392 |
| Torren Management, LLC | 0.00% | Reduce -98.0% | 15 | $294 |
| Trust Co | 0.00% | No change | 15 | $294 |
| Sunbelt Securities, Inc. | 0.00% | Reduce -36.4% | 14 | $274 |
| Owl Creek Wealth Partners LLC | 0.00% | — | 10 | $196 |
| Elequin Capital, LP | 0.00% | Reduce -74.1% | 7 | $137 |
| Gilpin Wealth Management, LLC | 0.00% | Add +150.0% | 5 | $98 |
| Abound Wealth Management | 0.00% | No change | 4 | $79 |
| Rothschild Investment LLC | 0.00% | Reduce -96.0% | 1 | $20 |
| Cedar Mountain Advisors, LLC | 0.00% | New | 1 | $20 |
| Avion Wealth | 0.00% | Reduce -71.4% | 24 | $0 |
"% of holder's portfolio" is AMPH's weight in each manager's 13F, not the share of Amphastar Pharmaceuticals Inc. the manager owns.