AMPHASTAR PHARMACEUTICALS IN (AMPH)
Institutional ownership reported to the SEC as of Q2 2026, across 31 quarters.
196
Reporting holders
$550.4M
Reported value
64.0%
Of shares outstanding
0.1%
Held as options
+4
Holder change
Institutions report 27,206,414 shares against 42,537,944 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end.
Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| BlackRock, Inc. | $105.4M | 5,224,934 | 0.00% | 8q | -3.6%-$4.0M |
| DIMENSIONAL FUND ADVISORS LP | $46.5M | 2,305,107 | 0.01% | 31q | +13.7%+$5.6M |
| STATE STREET CORP | $33.1M | 1,642,126 | 0.00% | 31q | +2.2%+$698.4K |
| VANGUARD CAPITAL MANAGEMENT LLC | $29.9M | 1,481,952 | 0.00% | 2q | -4.0%-$1.2M |
| AMERICAN CENTURY COMPANIES INC | $23.7M | 1,176,626 | 0.01% | 21q | +15.6%+$3.2M |
| MARSHALL WACE, LLP | $21.5M | 1,066,322 | 0.02% | 9q | +4.0%+$821.0K |
| GEODE CAPITAL MANAGEMENT, LLC | $19.6M | 969,840 | 0.00% | 31q | -0.7%-$137.5K |
| FULLER & THALER ASSET MANAGEMENT, INC. | $19.2M | 949,238 | 0.05% | 25q | -32.0%-$9.0M |
| D. E. Shaw & Co., Inc. | $17.9M | 887,048 | 0.01% | 8q | +33.3%+$4.5M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $16.3M | 809,568 | 0.00% | 2q | +2.8%+$439.0K |
| RENAISSANCE TECHNOLOGIES LLC | $10.6M | 525,100 | 0.01% | 31q | -5.2%-$581.2K |
| GOLDMAN SACHS GROUP INC | $10.2M | 505,360 | 0.00% | 31q | +53.4%+$3.6M |
| SYSTEMATIC FINANCIAL MANAGEMENT LP | $8.8M | 437,384 | 0.18% | 7q | -3.4%-$313.1K |
| MORGAN STANLEY | $8.8M | 434,840 | 0.00% | 35q | +3.5%+$292.7K |
| UBS Group AG | $7.9M | 393,110 | 0.00% | 31q | -6.5%-$547.9K |
| DENALI ADVISORS LLC | $7.6M | 375,965 | 0.76% | 4q | +41.1%+$2.2M |
| NORTHERN TRUST CORP | $7.5M | 370,991 | 0.00% | 31q | HELD |
| Bridge City Capital, LLC | $6.8M | 338,708 | 1.56% | 13q | +1.1%+$72.7K |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $6.3M | 310,178 | 0.00% | 31q | -3.4%-$219.2K |
| Sixth Street Partners Management Company, L.P. | $6.3M | 310,178 | 0.00% | new | NEW |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | $6.0M | 298,954 | 0.11% | 5q | -9.5%-$635.7K |
| ROYCE & ASSOCIATES LP | $5.9M | 294,758 | 0.05% | 9q | -27.4%-$2.2M |
| TWO SIGMA INVESTMENTS, LP | $5.0M | 248,115 | 0.00% | 13q | +79.6%+$2.2M |
| FIRST TRUST ADVISORS LP | $5.0M | 246,951 | 0.00% | 15q | +64.0%+$1.9M |
| Public Sector Pension Investment Board | $4.7M | 233,296 | 0.01% | 31q | +84.3%+$2.2M |
| Bank of New York Mellon Corp | $4.7M | 232,343 | 0.00% | 31q | -4.5%-$219.6K |
| VANGUARD FIDUCIARY TRUST CO | $4.5M | 224,478 | 0.00% | 2q | -2.8%-$132.5K |
| AQR CAPITAL MANAGEMENT LLC | $4.2M | 208,651 | 0.00% | 31q | +164.9%+$2.6M |
| PRINCIPAL FINANCIAL GROUP INC | $4.1M | 204,250 | 0.00% | 31q | -2.3%-$98.5K |
| NEW YORK STATE COMMON RETIREMENT FUND | $3.7M | 181,122 | 0.00% | 31q | +21.8%+$653.8K |
| JANE STREET GROUP, LLC | $3.6M | 178,734 | 0.00% | 19q | +93.3%+$1.7M |
| EXCHANGE TRADED CONCEPTS, LLC | $3.5M | 174,108 | 0.01% | 6q | +111.3%+$1.9M |
| Empowered Funds, LLC | $3.3M | 162,812 | 0.02% | 5q | -10.2%-$373.7K |
| O'SHAUGHNESSY ASSET MANAGEMENT, LLC | $3.2M | 159,427 | 0.01% | 5q | +53.4%+$1.1M |
| Invesco Ltd. | $3.2M | 158,064 | 0.00% | 31q | -73.9%-$9.0M |
| VICTORY CAPITAL MANAGEMENT INC | $3.0M | 149,612 | 0.00% | 28q | -40.1%-$2.0M |
| Universal- Beteiligungs- und Servicegesellschaft mbH | $2.8M | 139,402 | 0.00% | 3q | HELD |
| BANK OF AMERICA CORP /DE/ | $2.8M | 136,824 | 0.00% | 31q | -21.5%-$756.7K |
| ALGERT GLOBAL LLC | $2.7M | 131,400 | 0.03% | 6q | +5.4%+$134.8K |
| LAM GROUP, INC. | $2.6M | 130,800 | 1.31% | 15q | HELD |
| NORDEA INVESTMENT MANAGEMENT AB | $2.6M | 126,931 | 0.00% | 31q | +2.5%+$62.6K |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $2.4M | 116,653 | 0.00% | 5q | -64.1%-$4.2M |
| Nuveen, LLC | $1.8M | 88,397 | 0.00% | 6q | +15.4%+$238.2K |
| Vanguard Global Advisers, LLC | $1.8M | 87,639 | 0.00% | 2q | +74.7%+$756.3K |
| RHUMBLINE ADVISERS | $1.6M | 80,454 | 0.00% | 31q | -3.9%-$65.9K |
| Squarepoint Ops LLC | $1.6M | 78,795 | 0.00% | 15q | +178.0%+$1.0M |
| Legal & General Group Plc | $1.6M | 78,281 | 0.00% | 31q | -3.3%-$53.2K |
| ASSETMARK, INC | $1.4M | 68,590 | 0.00% | 16q | +27.6%+$299.7K |
| AMERIPRISE FINANCIAL INC | $1.4M | 68,244 | 0.00% | 31q | -56.7%-$1.8M |
| Robeco Institutional Asset Management B.V. | $1.3M | 66,407 | 0.00% | 2q | HELD |
| Swiss National Bank | $1.3M | 64,800 | 0.00% | 31q | -10.7%-$157.4K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $1.2M | 50,565 | 0.00% | 3q | +246.3%+$886.5K |
| JPMORGAN CHASE & CO | $1.2M | 57,563 | 0.00% | 31q | -45.0%-$973.6K |
| Jump Financial, LLC | $1.1M | 56,781 | 0.01% | new | NEW |
| WELLS FARGO & COMPANY/MN | $1.1M | 55,913 | 0.00% | 31q | -33.5%-$567.6K |
| CITIGROUP INC | $1.1M | 55,779 | 0.00% | 31q | +55.4%+$401.1K |
| Point72 Asset Management, L.P. | $1.1M | 54,964 | 0.00% | new | NEW |
| ALLIANCEBERNSTEIN L.P. | $1.1M | 56,430 | 0.00% | 31q | HELD |
| BNP PARIBAS FINANCIAL MARKETS | $1.1M | 54,663 | 0.00% | 31q | -65.0%-$2.0M |
| Creative Planning | $1.0M | 51,444 | 0.00% | 7q | +213.6%+$707.1K |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC | $1.0M | 50,912 | 0.00% | 18q | -70.3%-$2.4M |
| INTECH INVESTMENT MANAGEMENT LLC | $1.0M | 49,839 | 0.01% | 9q | +105.9%+$517.3K |
| SteelPeak Wealth, LLC | $982.4K | 48,684 | 0.03% | 6q | HELD |
| XTX Topco Ltd | $944.6K | 46,808 | 0.01% | 3q | -46.6%-$825.9K |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | $889.2K | 44,062 | 0.00% | 31q | -20.4%-$228.3K |
| Polaris Capital Management, LLC | $872.4K | 43,232 | 0.08% | 7q | HELD |
| CITADEL ADVISORS LLC | $759.4K | 16,231 | 0.00% | 19q | -75.2%-$2.3M |
| DEUTSCHE BANK AG\ | $712.5K | 35,307 | 0.00% | 34q | +6.6%+$43.9K |
| PRUDENTIAL FINANCIAL INC | $709.0K | 35,133 | 0.00% | 31q | -30.7%-$314.0K |
| Y-Intercept (Hong Kong) Ltd | $700.3K | 34,704 | 0.01% | new | NEW |
| Vident Advisory, LLC | $690.6K | 34,221 | 0.00% | 5q | +47.2%+$221.5K |
| Brevan Howard Capital Management LP | $690.2K | 34,201 | 0.01% | 7q | +194.5%+$455.8K |
| Legato Capital Management LLC | $688.8K | 34,135 | 0.06% | 13q | HELD |
| SEGALL BRYANT & HAMILL, LLC | $672.4K | 33,318 | 0.01% | 8q | HELD |
| SummerHaven Investment Management, LLC | $658.5K | 32,633 | 0.35% | 4q | HELD |
| MILLENNIUM MANAGEMENT LLC | $642.0K | 31,814 | 0.00% | 25q | -91.4%-$6.9M |
| Assenagon Asset Management S.A. | $614.1K | 30,432 | 0.00% | 10q | +100.0%+$307.1K |
| Engineers Gate Manager LP | $609.3K | 30,191 | 0.01% | new | NEW |
| Louisiana State Employees Retirement System | $608.2K | 30,600 | 0.00% | 25q | +94.9%+$296.2K |
| Illumine Investment Management, LLC | $594.2K | 0 | 0.39% | 7q | -100.0% |
| FMR LLC | $584.4K | 28,958 | 0.00% | 18q | +2137.9%+$558.3K |
| Advisor OS, LLC | $512.7K | 25,405 | 0.03% | 10q | HELD |
| ADVISORY RESEARCH INC | $511.3K | 25,337 | 0.05% | 14q | HELD |
| BARCLAYS PLC | $508.9K | 25,217 | 0.00% | 31q | +18.5%+$79.4K |
| FRANKLIN RESOURCES INC | $504.2K | 24,986 | 0.00% | 4q | -82.1%-$2.3M |
| Quadrature Capital Ltd | $493.0K | 24,428 | 0.00% | 2q | -20.1%-$123.8K |
| Campbell & CO Investment Adviser LLC | $468.4K | 23,211 | 0.02% | new | NEW |
| VANGUARD ASSET MANAGEMENT, Ltd | $465.2K | 23,052 | 0.00% | 2q | HELD |
| Quantinno Capital Management LP | $420.3K | 20,827 | 0.00% | new | NEW |
| MetLife Investment Management, LLC | $419.0K | 20,761 | 0.00% | 32q | HELD |
| RAYMOND JAMES FINANCIAL INC | $389.7K | 19,313 | 0.00% | 7q | +1.4%+$5.2K |
| Russell Investments Group, Ltd. | $365.4K | 18,108 | 0.00% | 26q | +425.6%+$295.9K |
| Illinois Municipal Retirement Fund | $352.2K | 17,452 | 0.00% | 12q | -10.6%-$41.9K |
| Man Group plc | $350.0K | 17,342 | 0.00% | 7q | -53.5%-$402.2K |
| STATE OF WISCONSIN INVESTMENT BOARD | $343.8K | 17,039 | 0.00% | 31q | -2.0%-$7.0K |
| Jupiter Topco LLC | $340.4K | 16,868 | 0.00% | new | FIRST |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $300.1K | 14,873 | 0.00% | 9q | -11.7%-$39.8K |
| FOX RUN MANAGEMENT, L.L.C. | $293.7K | 14,556 | 0.05% | new | NEW |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | $287.5K | 14,247 | 0.00% | 31q | -10.3%-$32.9K |
| Jain Global LLC | $286.2K | 14,183 | 0.00% | new | NEW |
Five percent filings
Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →
| Filed | Form | Filer | % of class |
|---|---|---|---|
| 2026-07-14 | 13G | Dimensional Fund Advisors LP | 5.2% |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 196 | $550.4M | 27,206,414 | 32 | 55 | 65 | 0.1% |
| Q1 2026 | 192 | $612.1M | 31,189,395 | 21 | 61 | 81 | 0.3% |
| Q4 2025 | 211 | $920.9M | 34,486,512 | 21 | 84 | 75 | 0.1% |
| Q3 2025 | 213 | $862.4M | 32,662,046 | 27 | 74 | 76 | 0.3% |
| Q2 2025 | 219 | $740.2M | 32,293,833 | 41 | 85 | 59 | 0.1% |
| Q1 2025 | 213 | $926.1M | 31,925,600 | 23 | 72 | 83 | 0.1% |
| Q4 2024 | 240 | $1.3B | 33,837,310 | 27 | 72 | 81 | 0.1% |
| Q3 2024 | 249 | $1.7B | 34,108,265 | 33 | 86 | 81 | 0.3% |
| Q2 2024 | 240 | $1.3B | 32,963,091 | 32 | 87 | 79 | 0.2% |
| Q1 2024 | 238 | $1.4B | 32,596,597 | 42 | 75 | 83 | 0.4% |
| Q4 2023 | 239 | $2.0B | 31,599,196 | 33 | 84 | 69 | 0.3% |
| Q3 2023 | 217 | $1.4B | 29,876,957 | 35 | 69 | 73 | 0.2% |
| Q2 2023 | 208 | $1.7B | 29,629,664 | 40 | 67 | 76 | 0.3% |
| Q1 2023 | 178 | $1.1B | 28,022,059 | 25 | 58 | 67 | 0.3% |
| Q4 2022 | 164 | $653.8M | 23,280,933 | 20 | 55 | 62 | 0.2% |
| Q3 2022 | 202 | $847.7M | 30,010,154 | 15 | 75 | 75 | 0.4% |
| Q2 2022 | 225 | $1.1B | 30,637,253 | 37 | 85 | 70 | 5.9% |
| Q1 2022 | 206 | $1.1B | 29,840,993 | 58 | 64 | 57 | 3.6% |
| Q4 2021 | 168 | $680.8M | 29,243,435 | 34 | 55 | 41 | 0.0% |
| Q3 2021 | 137 | $530.8M | 27,926,413 | 11 | 47 | 48 | 0.0% |
| Q2 2021 | 144 | $549.7M | 27,265,067 | 26 | 46 | 39 | 0.0% |
| Q1 2021 | 133 | $477.3M | 26,035,300 | 18 | 40 | 49 | 0.1% |
| Q4 2020 | 128 | $522.9M | 26,004,507 | 7 | 41 | 49 | 0.0% |
| Q3 2020 | 135 | $492.4M | 26,180,444 | 17 | 50 | 38 | 0.3% |
| Q2 2020 | 133 | $593.4M | 26,339,042 | 34 | 40 | 34 | 0.4% |
| Q1 2020 | 108 | $357.2M | 24,046,733 | 9 | 38 | 32 | 0.0% |
| Q4 2019 | 117 | $483.8M | 25,060,901 | 8 | 40 | 43 | 0.1% |
| Q3 2019 | 131 | $479.0M | 24,120,230 | 18 | 43 | 46 | 0.1% |
| Q2 2019 | 130 | $474.6M | 22,412,787 | 15 | 56 | 40 | 0.3% |
| Q1 2019 | 135 | $458.2M | 22,418,381 | 18 | 52 | 36 | 0.0% |
| Q4 2018 | 132 | $460.6M | 23,149,366 | 5 | 2 | 2 | 0.0% |