DaveManuel.com · Institutional Ownership · Who Owns It
AMPHASTAR PHARMACEUTICALS IN (AMPH)
Institutional ownership reported to the SEC as of Q2 2026, across 32 quarters.
214
Reporting holders
$573.1M
Reported value
66.6%
Of shares outstanding
0.1%
Calls
0.0%
Puts
+0
Holder change
Institutions report 28,333,383 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.
Calls and puts are the parts of reported value carried in derivative lines rather than shares, and they point in opposite directions: a manager holding calls is positioned for the security, one holding puts against it - or hedging shares they already own, which is why index funds carry so many. Most sites add the two together and report one figure, which averages away the only interesting part.
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 |
| LSV ASSET MANAGEMENT | $13.0M | 642,014 | 0.02% | 21q | -1.5%-$195.7K |
| 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 |
| HRT FINANCIAL LP | $7.8M | 387,530 | 0.01% | 2q | +589.8%+$6.7M |
| 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 |
| 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 |
| Pacer Advisors, Inc. | $4.9M | 241,181 | 0.01% | 13q | -7.8%-$409.7K |
| 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 |
| 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 | +110.7%+$1.4M |
| 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 |
| BESSEMER GROUP INC | $2.4M | 121,345 | 0.00% | 18q | -0.6%-$14.1K |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $2.4M | 116,653 | 0.00% | 5q | -64.1%-$4.2M |
| Public Sector Pension Investment Board | $2.4M | 116,648 | 0.01% | 31q | -7.8%-$200.3K |
| 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 |
| EXCHANGE TRADED CONCEPTS, LLC | $1.8M | 87,054 | 0.01% | 6q | +5.6%+$93.6K |
| 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 | -13.4%-$212.5K |
| 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 incl. $226.0K options CALL | 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 | +33.1%+$280.4K |
| 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 |
| PRICE T ROWE ASSOCIATES INC /MD/ | $1.0M | 51,103 | 0.00% | 17q | +13.8%+$125.2K |
| 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 incl. $431.9K options CALL+PUT | 16,231 | 0.00% | 19q | -75.2%-$2.3M |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM | $729.5K | 36,151 | 0.00% | 31q | +27.7%+$158.5K |
| 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 |
| Janney Montgomery Scott LLC | $683.0K | 33,841 | 0.00% | 4q | +144.9%+$404.1K |
| 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 |
| SG Americas Securities, LLC | $640.0K | 31,709 | 0.00% | 3q | -3.3%-$22.1K |
| 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 |
| Illumine Investment Management, LLC | $594.2K | none filed | 0.39% | 7q | -100.0% |
| FMR LLC | $584.4K | 28,958 | 0.00% | 18q | +2137.9%+$558.3K |
| CANADA LIFE ASSURANCE Co | $541.0K | 26,787 | 0.00% | 27q | -11.3%-$69.3K |
| State of Alaska, Department of Revenue | $531.0K | 26,433 | 0.01% | 31q | -3.6%-$19.6K |
| 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 |
| Thrivent Financial for Lutherans | $450.0K | 22,295 | 0.00% | 31q | -5.6%-$26.7K |
| NEW YORK STATE TEACHERS RETIREMENT SYSTEM | $427.0K | 21,180 | 0.00% | 31q | -3.0%-$13.0K |
| Quantinno Capital Management LP | $420.3K | 20,827 | 0.00% | new | NEW |
| MetLife Investment Management, LLC | $419.0K | 20,761 | 0.00% | 32q | HELD |
Showing the largest 100 of 214 reported holders.
What the insiders did
Open market purchases and sales reported on Form 4 in the last 180 days. Grants, option exercises and shares surrendered to cover tax are left out: they are compensation rather than a decision to buy or sell. Where a broker filled one order in tranches the lines are summed, because it was one decision.
Officers and directors
| Date | Insider | Role | Side | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-16 | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | Sold | 10,000 | $239.4K |
| 2026-08-07 | PETERS WILLIAM J | CFO, EVP & TREASURER | Sold | 8,180 | $183.9K |
| 2026-08-11 | PRINS RICHARD K | Director | Sold | 7,973 | $161.9K |
| 2026-09-21 | PETERS WILLIAM J | CFO, EVP & TREASURER | Sold | 4,139 | $103.5K |
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 |
|---|---|---|---|---|---|---|---|
| Q3 2026 | 52 | $25.4M | 959,139 | 7 | 17 | 11 | 0.0% |
| Q2 2026 | 214 | $573.1M | 28,333,383 | 29 | 61 | 77 | 0.1% |
| Q1 2026 | 214 | $636.0M | 32,346,840 | 24 | 64 | 94 | 0.3% |
| Q4 2025 | 235 | $938.2M | 34,992,824 | 22 | 94 | 83 | 0.1% |
| Q3 2025 | 242 | $882.4M | 33,018,492 | 32 | 80 | 89 | 0.3% |
| Q2 2025 | 247 | $760.1M | 33,035,796 | 46 | 91 | 70 | 0.1% |
| Q1 2025 | 242 | $965.1M | 33,254,339 | 29 | 77 | 92 | 0.1% |
| Q4 2024 | 266 | $1.3B | 35,165,630 | 28 | 78 | 89 | 0.1% |
| Q3 2024 | 281 | $1.7B | 35,508,370 | 39 | 91 | 91 | 0.3% |
| Q2 2024 | 269 | $1.4B | 34,435,435 | 35 | 95 | 89 | 0.2% |
| Q1 2024 | 273 | $1.5B | 34,821,219 | 48 | 84 | 95 | 0.4% |
| Q4 2023 | 278 | $2.1B | 33,982,465 | 38 | 92 | 86 | 0.3% |
| Q3 2023 | 257 | $1.5B | 32,004,141 | 40 | 84 | 85 | 0.2% |
| Q2 2023 | 246 | $1.8B | 31,409,248 | 49 | 77 | 90 | 0.3% |
| Q1 2023 | 218 | $1.1B | 30,237,244 | 32 | 69 | 80 | 0.2% |
| Q4 2022 | 212 | $818.6M | 29,151,281 | 24 | 66 | 87 | 0.2% |
| Q3 2022 | 195 | $967.3M | 34,266,314 | 13 | 75 | 73 | 0.4% |
| Q2 2022 | 220 | $1.3B | 34,893,759 | 36 | 83 | 69 | 5.2% |
| Q1 2022 | 202 | $1.3B | 33,826,632 | 58 | 62 | 55 | 3.2% |
| Q4 2021 | 165 | $949.5M | 40,778,684 | 34 | 54 | 41 | 0.0% |
| Q3 2021 | 134 | $795.5M | 41,854,697 | 11 | 47 | 46 | 0.0% |
| Q2 2021 | 141 | $854.8M | 42,395,580 | 26 | 43 | 40 | 0.0% |
| Q1 2021 | 130 | $711.5M | 38,818,537 | 18 | 40 | 48 | 0.1% |
| Q4 2020 | 125 | $779.3M | 38,756,434 | 7 | 41 | 48 | 0.0% |
| Q3 2020 | 132 | $731.5M | 38,931,438 | 17 | 48 | 38 | 0.2% |
| Q2 2020 | 130 | $880.2M | 39,107,329 | 34 | 40 | 32 | 0.3% |
| Q1 2020 | 106 | $816.5M | 55,001,298 | 9 | 38 | 30 | 0.0% |
| Q4 2019 | 114 | $717.5M | 37,173,975 | 8 | 38 | 43 | 0.1% |
| Q3 2019 | 128 | $733.7M | 36,965,627 | 18 | 42 | 46 | 0.1% |
| Q2 2019 | 127 | $746.0M | 35,267,307 | 15 | 56 | 38 | 0.2% |
| Q1 2019 | 132 | $720.7M | 35,265,166 | 18 | 49 | 37 | 0.0% |
| Q4 2018 | 129 | $4.0B | 200,734,013 | 5 | 2 | 2 | 0.0% |