AMPH
Amphastar Pharmaceuticals, Inc.
$19.61
-0.03 (-0.15%)
At close · Jul 6
Market Cap
$864.66M
Shares
44,092,919
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
The Jun 30, 2026 filing window is
still open — showing the latest known positions. Funds that have not filed yet
carry their prior-quarter positions; a fund that filed without this stock counts
as sold out.
Holders: 212
Total Value: $619,795,961
Total Shares: 31,638,335
Showing 1–100
of 214 holdings by value
· page 1 of 3
Institutional Ownership Trend
26 quarters
Holder Concentration
Across 214 13F filersTop Holder
17.1%
of institutional value
Top 5
38.4%
of institutional value
Top 10
55.3%
of institutional value
HHI
514
Broadly held
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Mega BlackRock, Inc. | $106,204,103 | 17.14% | 5,421,343 | Shares | Sole | 2026-05-13 | ||||
| Mega DIMENSIONAL FUND ADVISORS LP | $39,727,479 | 6.41% | 2,027,947 | Shares | Sole | 2026-05-07 | ||||
| Mega STATE STREET CORP | $31,491,218 | 5.08% | 1,607,515 | Shares | Defined | 2026-05-15 | ||||
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $30,240,201 | 4.88% | 1,543,655 | Shares | Defined | 2026-05-15 | ||||
| Mega TD Asset Management Inc | $30,189,051 | 4.87% | 1,541,044 | Shares | Sole | 2026-05-11 | ||||
| Large FULLER & THALER ASSET MANAGEMENT, INC. | $27,330,773 | 4.41% | 1,395,139 | Shares | Sole | 2026-05-14 | ||||
| Large MARSHALL WACE, LLP | $20,092,287 | 3.24% | 1,025,640 | Shares | Other | 2026-05-15 | ||||
| Mega AMERICAN CENTURY COMPANIES INC | $19,933,569 | 3.22% | 1,017,538 | Shares | Defined | 2026-05-15 | ||||
| Mega GEODE CAPITAL MANAGEMENT, LLC | $19,132,572 | 3.09% | 976,650 | Shares | Defined | 2026-05-15 | ||||
| Large Boston Trust Walden Corp | $18,508,415 | 2.99% | 944,789 | Shares | Defined | 2026-04-24 | ||||
| Large Epoch Investment Partners, Inc. | $17,609,353 | 2.84% | 898,895 | Shares | Defined | 2026-05-14 | ||||
| Mega D. E. Shaw & Co., Inc. | $13,037,966 | 2.10% | 665,542 | Shares | Defined | 2026-05-15 | ||||
| Large LSV ASSET MANAGEMENT | $12,767,077 | 2.06% | 651,714 | Shares | Sole | 2026-05-11 | ||||
| Mega Invesco Ltd. | $11,847,521 | 1.91% | 604,774 | Shares | Defined | 2026-05-12 | ||||
| Large RENAISSANCE TECHNOLOGIES LLC | $10,850,901 | 1.75% | 553,900 | Shares | Sole | 2026-05-14 | ||||
| Mid SYSTEMATIC FINANCIAL MANAGEMENT LP | $8,872,271 | 1.43% | 452,898 | Shares | Other | 2026-05-13 | ||||
| Mega MORGAN STANLEY | $8,234,399 | 1.33% | 420,337 | Shares | Defined | 2026-05-15 | ||||
| Mega UBS Group AG | $8,232,951 | 1.33% | 420,263 | Shares | Defined | 2026-05-05 | ||||
| Mid ROYCE & ASSOCIATES LP | $7,956,968 | 1.28% | 406,175 | Shares | Sole | 2026-05-12 | ||||
| Mega NORTHERN TRUST CORP Bank | $7,292,941 | 1.18% | 372,279 | Shares | Other | 2026-05-14 | ||||
| Mega MILLENNIUM MANAGEMENT LLC | $7,275,197 | 1.17% | 371,373 | Shares | Sole | 2026-05-15 | ||||
| Small Bridge City Capital, LLC | $6,564,706 | 1.06% | 335,105 | Shares | Sole | 2026-05-13 | ||||
| Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC | $6,473,652 | 1.04% | 330,457 | Shares | Sole | 2026-05-15 | ||||
| Mega GOLDMAN SACHS GROUP INC | $6,452,710 | 1.04% | 329,388 | Shares | Defined | 2026-05-15 | ||||
| Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $6,372,450 | 1.03% | 325,291 | Shares | Defined | 2026-05-14 | ||||
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $6,289,154 | 1.01% | 321,039 | Shares | Sole | 2026-05-15 | ||||
| Small DENALI ADVISORS LLC | $5,220,049 | 0.84% | 266,465 | Shares | Sole | 2026-05-08 | ||||
| Large Pacer Advisors, Inc. | $5,122,451 | 0.83% | 261,483 | Shares | Sole | 2026-06-18 | ||||
| Mega VICTORY CAPITAL MANAGEMENT INC | $4,889,997 | 0.79% | 249,617 | Shares | Sole | 2026-05-15 | ||||
| Mega Bank of New York Mellon Corp Bank | $4,764,794 | 0.77% | 243,226 | Shares | Defined | 2026-05-05 | ||||
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $4,526,151 | 0.73% | 231,044 | Shares | Defined | 2026-05-08 | ||||
| Mega PRINCIPAL FINANCIAL GROUP INC | $4,096,875 | 0.66% | 209,131 | Shares | Defined | 2026-05-04 | ||||
| Mid RICE HALL JAMES & ASSOCIATES, LLC | $3,670,147 | 0.59% | 187,348 | Shares | Sole | 2026-05-15 | ||||
| Large Empowered Funds, LLC | $3,552,293 | 0.57% | 181,332 | Shares | Other | 2026-05-15 | ||||
| Mega BANK OF AMERICA CORP /DE/ Bank | $3,414,986 | 0.55% | 174,323 | Shares | Defined | 2026-05-18 | ||||
| Large VOLORIDGE INVESTMENT MANAGEMENT, LLC | $3,353,572 | 0.54% | 171,188 | Shares | Sole | 2026-05-15 | ||||
| Mega BNP PARIBAS ARBITRAGE, SA | $3,057,548 | 0.49% | 156,077 | Shares | Defined | 2026-05-12 | ||||
| Mega FIRST TRUST ADVISORS LP | $2,950,077 | 0.48% | 150,591 | Shares | Sole | 2026-05-13 | ||||
| Large NEW YORK STATE COMMON RETIREMENT FUND Pension | $2,913,463 | 0.47% | 148,722 | Shares | Sole | 2026-05-06 | ||||
| Large Universal- Beteiligungs- und Servicegesellschaft mbH | $2,730,885 | 0.44% | 139,402 | Shares | Defined | 2026-05-11 | ||||
| Mega FRANKLIN RESOURCES INC | $2,728,982 | 0.44% | 139,305 | Shares | Defined | 2026-05-13 | ||||
| Mega TWO SIGMA INVESTMENTS, LP | $2,706,319 | 0.44% | 138,148 | Shares | Sole | 2026-05-15 | ||||
| Micro LAM GROUP, INC. | $2,562,372 | 0.41% | 130,800 | Shares | Sole | 2026-04-22 | ||||
| Large Public Sector Pension Investment Board Pension | $2,479,584 | 0.40% | 126,574 | Shares | Sole | 2026-05-13 | ||||
| Mega NORDEA INVESTMENT MANAGEMENT AB | $2,425,711 | 0.39% | 123,824 | Shares | Defined | 2026-05-13 | ||||
| Large BESSEMER GROUP INC | $2,390,879 | 0.39% | 122,046 | Shares | Defined | 2026-05-06 | ||||
| Mega JPMORGAN CHASE & CO | $2,048,603 | 0.33% | 104,574 | Shares | Defined | 2026-05-13 | ||||
| Large O'SHAUGHNESSY ASSET MANAGEMENT, LLC | $2,035,969 | 0.33% | 103,929 | Shares | Sole | 2026-05-13 | ||||
| Mega JANE STREET GROUP, LLC | $1,811,585 | 0.29% | 92,475 | Shares | Defined | 2026-05-12 | ||||
| Mid XTX Topco Ltd | $1,718,748 | 0.28% | 87,736 | Shares | Defined | 2026-05-15 | ||||
| Mega RHUMBLINE ADVISERS | $1,640,094 | 0.26% | 83,721 | Shares | Sole | 2026-05-12 | ||||
| Mid EXCHANGE TRADED CONCEPTS, LLC | $1,614,529 | 0.26% | 82,416 | Shares | Other | 2026-04-15 | ||||
| Mega Legal & General Group Plc | $1,585,144 | 0.26% | 80,916 | Shares | Defined | 2026-05-08 | ||||
| Mega AQR CAPITAL MANAGEMENT LLC | $1,543,260 | 0.25% | 78,778 | Shares | Other | 2026-05-15 | ||||
| Mega AMERIPRISE FINANCIAL INC | $1,543,201 | 0.25% | 78,775 | Shares | Defined | 2026-05-15 | ||||
| Mega Nuveen, LLC | $1,500,495 | 0.24% | 76,595 | Shares | Defined | 2026-04-30 | ||||
| Mega Swiss National Bank Bank | $1,422,234 | 0.23% | 72,600 | Shares | Sole | 2026-05-07 | ||||
| Large Robeco Institutional Asset Management B.V. | $1,300,913 | 0.21% | 66,407 | Shares | Defined | 2026-04-21 | ||||
| Mega CITADEL ADVISORS LLC | $1,283,928 | 0.21% | 65,540 | Shares | Defined | 2026-05-15 | ||||
| Small HUSSMAN STRATEGIC ADVISORS, INC. | $1,234,170 | 0.20% | 63,000 | Shares | Sole | 2026-05-11 | ||||
| Mid ALGERT GLOBAL LLC | $1,221,632 | 0.20% | 62,360 | Shares | Sole | 2026-05-14 | ||||
| Mega JANE STREET GROUP, LLC | $1,194,990 | 0.19% | 61,000 | Call | Defined | 2026-05-12 | ||||
| Mega ALLIANCEBERNSTEIN L.P. | $1,105,463 | 0.18% | 56,430 | Shares | Defined | 2026-05-15 | ||||
| Large HRT FINANCIAL LP | $1,100,585 | 0.18% | 56,181 | Shares | Defined | 2026-05-14 | ||||
| Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | $1,084,793 | 0.18% | 55,375 | Shares | Defined | 2026-05-13 | ||||
| Large ASSETMARK, INC | $1,052,727 | 0.17% | 53,738 | Shares | Sole | 2026-05-06 | ||||
| Large PRUDENTIAL FINANCIAL INC | $993,075 | 0.16% | 50,693 | Shares | Defined | 2026-05-13 | ||||
| Mega Vanguard Global Advisers, LLC | $982,693 | 0.16% | 50,163 | Shares | Defined | 2026-05-08 | ||||
| Mid SteelPeak Wealth, LLC | $949,370 | 0.15% | 48,462 | Shares | Sole | 2026-05-05 | ||||
| Large Trexquant Investment LP | $937,714 | 0.15% | 47,867 | Shares | Sole | 2026-05-15 | ||||
| Mega PRICE T ROWE ASSOCIATES INC /MD/ | $879,649 | 0.14% | 44,903 | Shares | Defined | 2026-05-15 | ||||
| Mid Polaris Capital Management, LLC | $846,914 | 0.14% | 43,232 | Shares | Sole | 2026-04-27 | ||||
| Mega WELLS FARGO & COMPANY/MN | $823,150 | 0.13% | 42,019 | Shares | Defined | 2026-05-11 | ||||
| Mega HSBC HOLDINGS PLC | $744,753 | 0.12% | 38,017 | Shares | Defined | 2026-04-30 | ||||
| Large Man Group plc | $730,197 | 0.12% | 37,274 | Shares | Defined | 2026-05-15 | ||||
| Mega CITIGROUP INC | $703,358 | 0.11% | 35,904 | Shares | Defined | 2026-05-11 | ||||
| Mid Legato Capital Management LLC | $668,704 | 0.11% | 34,135 | Shares | Other | 2026-05-14 | ||||
| Mid SEGALL BRYANT & HAMILL, LLC | $652,699 | 0.11% | 33,318 | Shares | Sole | 2026-05-22 | ||||
| Mega DEUTSCHE BANK AG\ Bank | $649,036 | 0.10% | 33,131 | Shares | Defined | 2026-05-06 | ||||
| Large SG Americas Securities, LLC Broker-Dealer | $642,669 | 0.10% | 32,806 | Shares | Sole | 2026-04-16 | ||||
| Small SummerHaven Investment Management, LLC | $639,280 | 0.10% | 32,633 | Shares | Sole | 2026-04-24 | ||||
| Mid Quadrature Capital Ltd | $598,689 | 0.10% | 30,561 | Shares | Other | 2026-05-15 | ||||
| Large CANADA LIFE ASSURANCE Co Insurance | $591,931 | 0.10% | 30,216 | Shares | Sole | 2026-05-14 | ||||
| Large Freestone Grove Partners LP | $584,898 | 0.09% | 29,857 | Shares | Sole | 2026-05-15 | ||||
| Large Squarepoint Ops LLC | $555,278 | 0.09% | 28,345 | Shares | Defined | 2026-05-15 | ||||
| Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension | $554,377 | 0.09% | 28,299 | Shares | Sole | 2026-05-18 | ||||
| Small Illumine Investment Management, LLC | $550,048 | 0.09% | 28,078 | Shares | Sole | 2026-05-04 | ||||
| Mid State of Alaska, Department of Revenue | $536,961 | 0.09% | 27,410 | Shares | Sole | 2026-04-20 | ||||
| Small Advisor OS, LLC | $497,683 | 0.08% | 25,405 | Shares | Sole | 2026-05-08 | ||||
| Small ADVISORY RESEARCH INC | $496,312 | 0.08% | 25,335 | Shares | Sole | 2026-05-14 | ||||
| Mid INTECH INVESTMENT MANAGEMENT LLC | $474,215 | 0.08% | 24,207 | Shares | Sole | 2026-05-08 | ||||
| Large Thrivent Financial for Lutherans | $462,676 | 0.07% | 23,618 | Shares | Sole | 2026-05-01 | ||||
| Large Vident Advisory, LLC | $455,349 | 0.07% | 23,244 | Shares | Defined | 2026-05-15 | ||||
| Mega VANGUARD ASSET MANAGEMENT, Ltd | $451,588 | 0.07% | 23,052 | Shares | Defined | 2026-05-08 | ||||
| Large NEW YORK STATE TEACHERS RETIREMENT SYSTEM Pension | $427,551 | 0.07% | 21,825 | Shares | Sole | 2026-04-27 | ||||
| Mega BARCLAYS PLC | $416,933 | 0.07% | 21,283 | Shares | Defined | 2026-05-15 | ||||
| Large MetLife Investment Management, LLC | $406,707 | 0.07% | 20,761 | Shares | Defined | 2026-05-14 | ||||
| Small Round Rock Advisors LLC | $401,497 | 0.06% | 20,495 | Shares | Sole | 2026-05-15 | ||||
| Mega CITADEL ADVISORS LLC | $389,841 | 0.06% | 19,900 | Call | Defined | 2026-05-15 | ||||
| Mid Illinois Municipal Retirement Fund Pension | $382,553 | 0.06% | 19,528 | Shares | Sole | 2026-05-05 | ||||
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