Amphastar Pharmaceuticals, Inc. (AMPH) — Institutional Holders, Q2 2026
213 institutional investment managers reported a AMPH position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $571.3M. Every filer is listed below, ranked by position value, 100 per page; this page shows ranks 1 to 100. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
AMPH in Q2 2026: what funds did
Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.
Biggest buyers
- HRT FINANCIALAdded · +331,349 sh+$6.7M
- DIMENSIONAL FUND ADVISORSAdded · +277,160 sh+$5.6M
- Pacer AdvisorsNew · +241,181 sh+$4.9M
- D. E. ShawAdded · +221,506 sh+$4.5M
- GOLDMAN SACHS GROUPAdded · +175,972 sh+$3.6M
Biggest sellers
- TD ASSET MANAGEMENTSold out · -1,541,044 sh-$31.1M
- Boston WaldenSold out · -944,789 sh-$19.1M
- Epoch Investment PartnersSold out · -898,895 sh-$18.1M
- Invesco Ltd.Trimmed · -446,710 sh-$9.0M
- FULLER & THALER ASSET MANAGEMENTTrimmed · -445,901 sh-$9.0M
AMPH 13F holders ranked 1–100 of 213
| # | Institution | Shares | Value | % of portfolio | QoQShares vs Q1 2026 |
|---|---|---|---|---|---|
| 1 | BlackRock#1 · 5,224,934 sh | 5,224,934 | $105.4M | <0.01% | -3.6% |
| 2 | DIMENSIONAL FUND ADVISORS#2 · 2,305,107 sh | 2,305,107 | $46.5M | <0.01% | +13.7% |
| 3 | STATE STREET#3 · 1,642,126 sh | 1,642,126 | $33.1M | <0.01% | +2.2% |
| 4 | VANGUARD CAPITAL MANAGEMENT#4 · 1,481,952 sh | 1,481,952 | $29.9M | <0.01% | -4.0% |
| 5 | AMERICAN CENTURY COMPANIES#5 · 1,176,626 sh | 1,176,626 | $23.7M | 0.01% | +15.6% |
| 6 | MARSHALL WACE, LLP#6 · 1,066,322 sh | 1,066,322 | $21.5M | 0.02% | +4.0% |
| 7 | GEODE CAPITAL MANAGEMENT#7 · 969,840 sh | 969,840 | $19.6M | <0.01% | -0.7% |
| 8 | FULLER & THALER ASSET MANAGEMENT#8 · 949,238 sh | 949,238 | $19.2M | 0.05% | -32.0% |
| 9 | D. E. Shaw#9 · 887,048 sh | 887,048 | $17.9M | <0.01% | +33.3% |
| 10 | VANGUARD PORTFOLIO MANAGEMENT#10 · 809,568 sh | 809,568 | $16.3M | <0.01% | +2.8% |
| 11 | LSV ASSET MANAGEMENT#11 · 642,014 sh | 642,014 | $13.0M | 0.02% | -1.5% |
| 12 | RENAISSANCE TECHNOLOGIES#12 · 525,100 sh | 525,100 | $10.6M | 0.01% | -5.2% |
| 13 | GOLDMAN SACHS GROUP#13 · 505,360 sh | 505,360 | $10.2M | <0.01% | +53.4% |
| 14 | SYSTEMATIC FINANCIAL MANAGEMENT#14 · 437,384 sh | 437,384 | $8.8M | 0.18% | -3.4% |
| 15 | MORGAN STANLEY#15 · 434,840 sh | 434,840 | $8.8M | <0.01% | +3.5% |
| 16 | UBS Group AG#16 · 393,110 sh | 393,110 | $7.9M | <0.01% | -6.5% |
| 17 | HRT FINANCIAL#17 · 387,530 sh | 387,530 | $7.8M | 0.02% | +589.8% |
| 18 | DENALI ADVISORS#18 · 375,965 sh | 375,965 | $7.6M | 0.76% | +41.1% |
| 19 | NORTHERN#19 · 370,991 sh | 370,991 | $7.5M | <0.01% | -0.3% |
| 20 | Bridge City Capital#20 · 338,708 sh | 338,708 | $6.8M | 1.56% | +1.1% |
| 21 | CHARLES SCHWAB INVESTMENT MANAGEMENT#21 · 310,178 sh | 310,178 | $6.3M | <0.01% | -3.4% |
| 22 | BRIDGEWAY CAPITAL MANAGEMENT#22 · 298,954 sh | 298,954 | $6.0M | 0.11% | -9.5% |
| 23 | ROYCE & ASSOCIATES#23 · 294,758 sh | 294,758 | $5.9M | 0.05% | -27.4% |
| 24 | TWO SIGMA INVESTMENTS#24 · 248,115 sh | 248,115 | $5.0M | <0.01% | +79.6% |
| 25 | FIRST ADVISORS#25 · 246,951 sh | 246,951 | $5.0M | <0.01% | +64.0% |
| 26 | Pacer Advisors#26 · 241,181 sh | 241,181 | $4.9M | 0.01% | New |
| 27 | Bank of New York Mellon#27 · 232,343 sh | 232,343 | $4.7M | <0.01% | -4.5% |
| 28 | VANGUARD FIDUCIARY#28 · 224,478 sh | 224,478 | $4.5M | <0.01% | -2.8% |
| 29 | AQR CAPITAL MANAGEMENT#29 · 208,651 sh | 208,651 | $4.2M | <0.01% | +164.9% |
| 30 | PRINCIPAL FINANCIAL GROUP#30 · 204,250 sh | 204,250 | $4.1M | <0.01% | -2.3% |
| 31 | NEW YORK STATE COMMON RETIREMENT FUND#31 · 181,122 sh | 181,122 | $3.7M | <0.01% | +21.8% |
| 32 | JANE STREET GROUP#32 · 178,734 sh | 178,734 | $3.6M | <0.01% | +93.3% |
| 33 | Empowered Funds#33 · 162,812 sh | 162,812 | $3.3M | 0.02% | -10.2% |
| 34 | O'SHAUGHNESSY ASSET MANAGEMENT#34 · 159,427 sh | 159,427 | $3.2M | 0.01% | +53.4% |
| 35 | Invesco Ltd.#35 · 158,064 sh | 158,064 | $3.2M | <0.01% | -73.9% |
| 36 | VICTORY CAPITAL MANAGEMENT#36 · 149,612 sh | 149,612 | $3.0M | <0.01% | -40.1% |
| 37 | Universal- Beteiligungs- und Servicegesellschaft mbH#37 · 139,402 sh | 139,402 | $2.8M | <0.01% | 0.0% |
| 38 | BANK OF AMERICA#38 · 136,824 sh | 136,824 | $2.8M | <0.01% | -21.5% |
| 39 | ALGERT GLOBAL#39 · 131,400 sh | 131,400 | $2.7M | 0.03% | +110.7% |
| 40 | LAM GROUP#40 · 130,800 sh | 130,800 | $2.6M | — | 0.0% |
| 41 | NORDEA INVESTMENT MANAGEMENT AB#41 · 126,931 sh | 126,931 | $2.6M | <0.01% | +2.5% |
| 42 | BESSEMER GROUP#42 · 121,345 sh | 121,345 | $2.4M | <0.01% | -0.6% |
| 43 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP#43 · 116,653 sh | 116,653 | $2.4M | <0.01% | -64.1% |
| 44 | PUBLIC SECTOR PENSION INVESTMENT BOARD#44 · 116,648 sh | 116,648 | $2.4M | <0.01% | -7.8% |
| 45 | Nuveen#45 · 88,397 sh | 88,397 | $1.8M | <0.01% | +15.4% |
| 46 | Vanguard Global Advisers#46 · 87,639 sh | 87,639 | $1.8M | <0.01% | +74.7% |
| 47 | EXCHANGE TRADED CONCEPTS#47 · 87,054 sh | 87,054 | $1.8M | <0.01% | +5.6% |
| 48 | RHUMBLINE ADVISERS#48 · 80,454 sh | 80,454 | $1.6M | <0.01% | -3.9% |
| 49 | Squarepoint Ops#49 · 78,795 sh | 78,795 | $1.6M | <0.01% | +178.0% |
| 50 | Legal & General Group Plc#50 · 78,281 sh | 78,281 | $1.6M | <0.01% | -3.3% |
| 51 | ASSETMARK#51 · 68,590 sh | 68,590 | $1.4M | — | +27.6% |
| 52 | AMERIPRISE FINANCIAL#52 · 68,244 sh | 68,244 | $1.4M | <0.01% | -13.4% |
| 53 | Robeco Institutional Asset Management B.V.#53 · 66,407 sh | 66,407 | $1.3M | — | 0.0% |
| 54 | Swiss National Bank#54 · 64,800 sh | 64,800 | $1.3M | <0.01% | -10.7% |
| 55 | JPMORGAN CHASE#55 · 57,563 sh | 57,563 | $1.2M | <0.01% | -45.0% |
| 56 | Jump Financial#56 · 56,781 sh | 56,781 | $1.1M | <0.01% | New |
| 57 | WELLS FARGO & COMPANY#57 · 55,913 sh | 55,913 | $1.1M | <0.01% | +33.1% |
| 58 | CITIGROUP#58 · 55,779 sh | 55,779 | $1.1M | <0.01% | +55.4% |
| 59 | Point72 Asset Management, L.P.#59 · 54,964 sh | 54,964 | $1.1M | <0.01% | New |
| 60 | ALLIANCEBERNSTEIN L.P.#60 · 56,430 sh | 56,430 | $1.1M | <0.01% | 0.0% |
| 61 | BNP PARIBAS FINANCIAL MARKETS#61 · 54,663 sh | 54,663 | $1.1M | <0.01% | -65.0% |
| 62 | Creative Planning#62 · 51,444 sh | 51,444 | $1.0M | <0.01% | +213.6% |
| 63 | PRICE T ROWE ASSOCIATES#63 · 51,103 sh | 51,103 | $1.0M | <0.01% | +13.8% |
| 64 | VOLORIDGE INVESTMENT MANAGEMENT#64 · 50,912 sh | 50,912 | $1.0M | <0.01% | -70.3% |
| 65 | SUSQUEHANNA INTERNATIONAL GROUP, LLP#65 · 50,565 sh | 50,565 | $1.0M | <0.01% | +246.3% |
| 66 | INTECH INVESTMENT MANAGEMENT#66 · 49,839 sh | 49,839 | $1.0M | <0.01% | +105.9% |
| 67 | SteelPeak Wealth#67 · 48,684 sh | 48,684 | $982.4K | — | +0.5% |
| 68 | XTX Topco Ltd#68 · 46,808 sh | 46,808 | $944.6K | 0.01% | -46.6% |
| 69 | UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AME#69 · 44,062 sh | 44,062 | $889.2K | <0.01% | -20.4% |
| 70 | Polaris Capital Management#70 · 43,232 sh | 43,232 | $872.4K | — | 0.0% |
| 71 | DEUTSCHE BANK AG\#71 · 35,307 sh | 35,307 | $712.5K | <0.01% | +6.6% |
| 72 | PRUDENTIAL FINANCIAL#72 · 35,133 sh | 35,133 | $709.0K | <0.01% | -30.7% |
| 73 | Y-Intercept (Hong Kong) Ltd#73 · 34,704 sh | 34,704 | $700.3K | — | New |
| 74 | Vident Advisory#74 · 34,221 sh | 34,221 | $690.6K | <0.01% | +47.2% |
| 75 | Brevan Howard Capital Management#75 · 34,201 sh | 34,201 | $690.2K | <0.01% | +194.5% |
| 76 | Legato Capital Management#76 · 34,135 sh | 34,135 | $688.8K | 0.06% | 0.0% |
| 77 | Janney Montgomery Scott#77 · 33,841 sh | 33,841 | $683.0K | <0.01% | +144.9% |
| 78 | SEGALL BRYANT & HAMILL#78 · 33,318 sh | 33,318 | $672.4K | <0.01% | 0.0% |
| 79 | SummerHaven Investment Management#79 · 32,633 sh | 32,633 | $658.5K | — | 0.0% |
| 80 | MILLENNIUM MANAGEMENT#80 · 31,814 sh | 31,814 | $642.0K | <0.01% | -91.4% |
| 81 | SG Americas Securities#81 · 31,709 sh | 31,709 | $640.0K | <0.01% | -3.3% |
| 82 | Engineers Gate Manager#82 · 30,191 sh | 30,191 | $609.3K | <0.01% | New |
| 83 | Illumine Investment Management#83 · 0 sh | 0 | $594.2K | — | -100.0% |
| 84 | FMR#84 · 28,958 sh | 28,958 | $584.4K | 0.00% | +2137.9% |
| 85 | GREAT WEST LIFE ASSURANCE#85 · 26,787 sh | 26,787 | $541.0K | <0.01% | -11.3% |
| 86 | State of Alaska, Department of Revenue#86 · 26,433 sh | 26,433 | $531.0K | — | -3.6% |
| 87 | Advisor OS#87 · 25,405 sh | 25,405 | $512.7K | 0.03% | 0.0% |
| 88 | ADVISORY RESEARCH#88 · 25,337 sh | 25,337 | $511.3K | 0.05% | 0.0% |
| 89 | BARCLAYS PLC#89 · 25,217 sh | 25,217 | $508.9K | <0.01% | +18.5% |
| 90 | FRANKLIN RESOURCES#90 · 24,986 sh | 24,986 | $504.2K | <0.01% | -82.1% |
| 91 | Quadrature Capital Ltd#91 · 24,428 sh | 24,428 | $493.0K | <0.01% | -20.1% |
| 92 | Campbell & Investment Adviser#92 · 23,211 sh | 23,211 | $468.4K | 0.02% | New |
| 93 | VANGUARD ASSET MANAGEMENT, Ltd#93 · 23,052 sh | 23,052 | $465.2K | <0.01% | 0.0% |
| 94 | THRIVENT FINANCIAL FOR LUTHERANS#94 · 22,295 sh | 22,295 | $450.0K | <0.01% | -5.6% |
| 95 | NEW YORK STATE TEACHERS RETIREMENT SYSTEM#95 · 21,180 sh | 21,180 | $427.0K | — | -3.0% |
| 96 | Quantinno Capital Management#96 · 20,827 sh | 20,827 | $420.3K | <0.01% | New |
| 97 | MetLife Investment Management#97 · 20,761 sh | 20,761 | $419.0K | <0.01% | 0.0% |
| 98 | RAYMOND JAMES FINANCIAL#98 · 19,313 sh | 19,313 | $389.7K | <0.01% | +1.4% |
| 99 | Russell Investments Group, Ltd.#99 · 18,108 sh | 18,108 | $365.4K | <0.01% | +425.6% |
| 100 | Illinois Municipal Retirement Fund#100 · 17,452 sh | 17,452 | $352.2K | <0.01% | -10.6% |
Funds that sold out of AMPH in Q2 2026 (32)
Held AMPH at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.
| Institution | Shares sold | Value in Q1 2026 |
|---|---|---|
| TD ASSET MANAGEMENT1,541,044 sh | 1,541,044 | $30.2M |
| Boston Walden944,789 sh | 944,789 | $18.5M |
| Epoch Investment Partners898,895 sh | 898,895 | $17.6M |
| RICE HALL JAMES & ASSOCIATES187,348 sh | 187,348 | $3.7M |
| HUSSMAN STRATEGIC ADVISORS63,000 sh | 63,000 | $1.2M |
| Trexquant Investment47,867 sh | 47,867 | $937.7K |
| HSBC PLC38,017 sh | 38,017 | $753.5K |
| Freestone Grove Partners29,857 sh | 29,857 | $584.9K |
| Round Rock Advisors20,495 sh | 20,495 | $401.5K |
| Verition Fund Management18,597 sh | 18,597 | $364.3K |
| nVerses Capital17,685 sh | 17,685 | $346.4K |
| Quantedge Capital Pte Ltd13,500 sh | 13,500 | $264.5K |
| MML INVESTORS SERVICES12,367 sh | 12,367 | $242.3K |
| NATIXIS ADVISORS11,510 sh | 11,510 | $225.0K |
| PDT Partners11,441 sh | 11,441 | $224.1K |
| Vanguard Personalized Indexing Management10,290 sh | 10,290 | $201.6K |
| AMALGAMATED BANK10,215 sh | 10,215 | $200.0K |
| Arizona State Retirement System10,098 sh | 10,098 | $197.8K |
| QUADRANT CAPITAL GROUP2,262 sh | 2,262 | $71.1K |
| BNP Paribas Asset Management Holding S.A.396 sh | 396 | $7.8K |
| MAI Capital Management371 sh | 371 | $7.3K |
| SIMPLEX TRADING262 sh | 262 | $5.1K |
| GROUP ONE TRADING, L.P.214 sh | 214 | $4.2K |
| TWIN PEAKS WEALTH ADVISORS177 sh | 177 | $3.5K |
| CoreCap Advisors107 sh | 107 | $2.1K |
| Truvestments Capital96 sh | 96 | $1.9K |
| PICTON MAHONEY ASSET MANAGEMENT24 sh | 24 | $470.00 |
| Sound Income Strategies23 sh | 23 | $466.00 |
| Legacy Wealth Managment21 sh | 21 | $412.00 |
| Owl Creek Wealth Partners10 sh | 10 | $196.00 |
| Cedar Mountain Advisors1 sh | 1 | $20.00 |
| Avion Wealth24 sh | 24 | $0.00 |
Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.