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Amphastar Pharmaceuticals (AMPH) Institutional Ownership

Amphastar Pharmaceuticals logo
$21.65 +0.13 (+0.60%)
As of 11:43 AM Eastern
This is a fair market value price provided by Massive. Learn more.
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Institutional Ownership Changes (13F Filings) for Amphastar Pharmaceuticals (NASDAQ:AMPH)

Current
Institutional Ownership
Percentage
65.09%
Number of
Institutional Buyers
(last 12 months)
101
Total
Institutional Inflows
(last 12 months)
$164.18M
Number of
Institutional Sellers
(last 12 months)
78
Total
Institutional Outflows
(last 12 months)
$87.57M
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AMPH Institutional Buying and Selling by Quarter

Amphastar Pharmaceuticals Major Shareholders & Ownership History

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Reporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
8/24/2026California State Teachers Retirement System729,527$14.72M0.0%+2,477.9%1.715%
8/18/2026 Empowered Funds LLC162,812$3.29M0.0%N/A0.383%
8/17/2026 Bank of America Corp DE136,824$2.76M0.0%N/A0.322%
8/15/2026 Man Group plc17,342$350K0.0%N/A0.041%
8/15/2026 Jupiter Topco LLC16,868$340K0.0%N/A0.040%
8/14/2026 Canada Pension Plan Investment Board11,500$232K0.0%N/A0.027%
8/14/2026 Legal & General Group Plc78,281$1.58M0.0%N/A0.184%
8/14/2026 The Manufacturers Life Insurance Company 14,247$288K0.0%N/A0.033%
8/14/2026 Algert Global LLC131,400$2.65M0.0%+110.7%0.309%
8/12/2026 Quantbot Technologies LP1,924$39K0.0%N/A0.005%
8/10/2026 Denali Advisors LLC375,965$7.59M0.8%+41.1%0.884%
8/7/2026 Deutsche Bank AG35,307$712K0.0%N/A0.080%
8/6/2026 Bank of New York Mellon Corp232,343$4.69M0.0%N/A0.527%
8/6/2026 State of Wyoming7,022$142K0.0%N/A0.016%
7/2/2026 CX Institutional1,259$25K0.0%-57.7%0.003%
6/18/2026 Pacer Advisors Inc.261,483$5.12M0.0%+47.1%0.593%
5/22/2026 Segall Bryant & Hamill LLC33,318$653K0.0%+197.9%0.076%
5/19/2026 Bank of America Corp DE174,323$3.42M0.0%+36.0%0.395%
5/18/2026California State Teachers Retirement System28,299$554K0.0%-20.9%0.064%
5/18/2026 Empowered Funds LLC181,332$3.55M0.0%+9.3%0.411%
5/15/2026 Rice Hall James & Associates LLC187,348$3.67M0.2%+54.6%0.425%
5/15/2026 Epoch Investment Partners Inc.898,895$17.61M0.1%-20.2%2.039%
5/14/2026 Renaissance Technologies LLC553,900$10.85M0.0%+1.7%1.256%
5/14/2026 Arrowstreet Capital Limited Partnership325,291$6.37M0.0%-41.9%0.738%
5/14/2026 Systematic Financial Management LP452,898$8.87M0.2%+4.0%1.027%
5/13/2026 First Trust Advisors LP150,591$2.95M0.0%+7.3%0.342%
5/12/2026 Quantedge Capital Pte Ltd13,500$264K0.1%-85.3%0.031%
5/7/2026 Dimensional Fund Advisors LP2,027,947$39.73M0.0%+12.7%4.554%
5/6/2026 Assetmark Inc.53,738$1.05M0.0%-1.1%0.121%
5/6/2026 Bessemer Group Inc.122,046$2.39M0.0%+1.0%0.274%
5/6/2026 SteelPeak Wealth LLC48,462$949K0.0%-13.0%0.109%
5/5/2026 Illinois Municipal Retirement Fund19,528$383K0.0%-6.6%0.044%
5/4/2026 Principal Financial Group Inc.209,131$4.10M0.0%-4.1%0.470%
4/30/2026 Hsbc Holdings PLC38,017$753K0.0%N/A0.085%
4/27/2026 New York State Teachers Retirement System21,825$428K0.0%-5.0%0.049%
4/25/2026 Boston Trust Walden Corp944,789$18.51M0.2%-13.1%2.122%
4/22/2026 Sterling Capital Management LLC10,385$203K0.0%-37.4%0.023%
4/21/2026 Louisiana State Employees Retirement System15,700$308K0.0%N/A0.035%
4/16/2026 SG Americas Securities LLC32,806$643K0.0%-64.9%0.074%
3/9/2026 Corient Private Wealth LLC7,839$210K0.0%-50.1%0.017%
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2/24/2026 Pacer Advisors Inc.177,744$4.76M0.0%+2,864.4%0.387%
2/19/2026 Invesco Ltd.501,404$13.43M0.0%+28.7%1.091%
2/19/2026 Corient Private Wealth LLC15,339$411K0.0%-2.4%0.033%
2/18/2026 Vident Advisory LLC20,409$547K0.0%+10.7%0.044%
2/18/2026 State of Tennessee Department of Treasury8,619$228K0.0%-7.3%0.019%
2/18/2026 Fuller & Thaler Asset Management Inc.1,394,463$37.34M0.1%+3.0%3.035%
2/18/2026 Empowered Funds LLC165,907$4.44M0.0%+10.8%0.361%
2/18/2026 XTX Topco Ltd48,607$1.30M0.0%N/A0.106%
2/18/2026 Voloridge Investment Management LLC231,305$6.19M0.0%-20.9%0.503%
2/18/2026 Susquehanna Portfolio Strategies LLC66,969$1.79M0.0%+69.3%0.146%
2/18/2026 Millennium Management LLC290,673$7.78M0.0%-58.3%0.633%
2/18/2026 Man Group plc14,151$379K0.0%-56.3%0.031%
2/18/2026 Gotham Asset Management LLC27,802$745K0.0%+81.0%0.061%
2/18/2026 Balyasny Asset Management L.P.77,467$2.08M0.0%-45.4%0.169%
2/18/2026 Bridgeway Capital Management LLC323,549$8.67M0.2%+3.6%0.704%
2/17/2026 Freestone Grove Partners LP27,593$739K0.0%N/A0.060%
2/17/2026 AQR Capital Management LLC67,652$1.81M0.0%+8.9%0.147%
2/17/2026 Quantedge Capital Pte Ltd91,700$2.46M1.2%+103.3%0.200%
2/17/2026 Trexquant Investment LP113,673$3.04M0.0%N/A0.247%
2/17/2026 Jump Financial LLC7,800$209K0.0%N/A0.017%
2/17/2026 Price T Rowe Associates Inc. MD36,796$986K0.0%-86.6%0.080%
2/17/2026 Clark Capital Management Group Inc.317,482$8.50M0.1%+11.9%0.691%
2/17/2026 State of Wisconsin Investment Board17,506$469K0.0%-17.9%0.038%
2/17/2026 ExodusPoint Capital Management LP14,929$400K0.0%N/A0.032%
2/17/2026 Rice Hall James & Associates LLC121,176$3.25M0.2%-6.3%0.264%
2/16/2026 Squarepoint Ops LLC14,860$398K0.0%-69.9%0.032%
2/16/2026 MML Investors Services LLC14,661$393K0.0%+73.3%0.032%
2/16/2026 Epoch Investment Partners Inc.1,126,585$30.17M0.2%-0.7%2.452%
2/16/2026 Bridge City Capital LLC235,485$6.31M1.9%+72.8%0.512%
2/13/2026 Marshall Wace LLP1,237,284$33.13M0.0%+41.6%2.693%
2/13/2026 The Manufacturers Life Insurance Company 16,402$439K0.0%-7.7%0.036%
2/13/2026 Corient IA LLC7,500$201K0.2%N/A0.016%
2/13/2026 Public Sector Pension Investment Board122,505$3.28M0.0%-12.3%0.267%
2/13/2026 Rafferty Asset Management LLC7,682$206K0.0%N/A0.017%
2/13/2026 Arkadios Wealth Advisors26,303$704K0.0%-27.0%0.057%
2/13/2026 First Trust Advisors LP140,310$3.76M0.0%-6.7%0.305%
2/13/2026 Charles Schwab Investment Management Inc.350,707$9.39M0.0%-1.6%0.763%
2/13/2026 State Street Corp1,531,786$41.02M0.0%+2.1%3.334%
2/13/2026 Martingale Asset Management L P12,400$332K0.0%-33.0%0.027%
2/13/2026 UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC55,232$1.48M0.0%+1.7%0.120%
2/12/2026 MetLife Investment Management LLC21,075$564K0.0%-8.7%0.046%
2/12/2026 Commonwealth Equity Services LLC8,742$234K0.0%+11.2%0.019%
2/12/2026 Renaissance Technologies LLC544,700$14.59M0.0%-7.2%1.185%
2/12/2026 Dimensional Fund Advisors LP1,799,685$48.20M0.0%+2.5%3.917%
2/12/2026 Federated Hermes Inc.23,537$630K0.0%N/A0.051%
2/12/2026 New York State Common Retirement Fund125,968$3.37M0.0%+39.7%0.274%
2/12/2026 Fuller & Thaler Asset Management Inc.1,394,463$37.34M0.1%+3.0%3.035%
2/12/2026 Campbell & CO Investment Adviser LLC30,682$822K0.0%-30.4%0.067%
2/12/2026 Nuveen LLC76,101$2.04M0.0%-2.1%0.166%
2/11/2026 Empowered Funds LLC165,907$4.44M0.0%+10.8%0.361%
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2/11/2026 Janney Montgomery Scott LLC14,230$381K0.0%+6.2%0.031%
2/11/2026 Deutsche Bank AG29,557$792K0.0%+4.1%0.064%
2/11/2026 LPL Financial LLC19,844$531K0.0%+35.5%0.043%
2/11/2026 Franklin Resources Inc.26,045$697K0.0%+173.4%0.057%
2/11/2026Brandywine Global Investment Management LLC105,417$2.82M0.0%N/A0.229%
2/11/2026 O Shaughnessy Asset Management LLC87,183$2.34M0.0%+26.2%0.190%
2/11/2026 Los Angeles Capital Management LLC19,397$478K0.0%+2.4%0.042%
2/11/2026 Vestcor Inc16,383$439K0.0%+74.6%0.036%
2/11/2026 State of Wyoming7,561$202K0.0%+129.1%0.016%
2/10/2026 Cibc World Market Inc.62,192$1.67M0.0%N/A0.135%


AMPH Institutional Ownership - Frequently Asked Questions

During the previous two years, 259 institutional investors and hedge funds held shares of Amphastar Pharmaceuticals. The most heavily invested institutionals were Vanguard Group Inc. ($69.85M), TD Asset Management Inc ($52.57M), State Street Corp ($41.02M), Dimensional Fund Advisors LP ($39.73M), Fuller & Thaler Asset Management Inc. ($37.34M), Marshall Wace LLP ($33.13M), and Geode Capital Management LLC ($23.75M).Learn more on Amphastar Pharmaceuticals' institutional investors.

65.09% of Amphastar Pharmaceuticals' stock is owned by institutional investors. Learn more on AMPH's institutional investor holdings.

Of the 214 institutional investors that purchased Amphastar Pharmaceuticals' stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: Pacer Advisors Inc. ($1.60M), Boston Trust Walden Corp ($1.22M), California State Teachers Retirement System ($701.23K), Millennium Management LLC ($690.78K), Dimensional Fund Advisors LP ($506.35K), CX Institutional ($444.42K), and Marshall Wace LLP ($428.81K).

Institutional investors have bought a total of 6,685,266 shares in the last 24 months. This purchase volume represents approximately $164.18M in transactions.

Of the 78 institutional investors that sold Amphastar Pharmaceuticals' stock in the last 24 months, the following investors and hedge funds have sold the highest volume of shares: Millennium Management LLC ($407.09K), Epoch Investment Partners Inc. ($342.47K), Pacer Advisors Inc. ($320.10K), Price T Rowe Associates Inc. MD ($238.43K), Arrowstreet Capital Limited Partnership ($234.14K), Boston Trust Walden Corp ($231.66K), and Qube Research & Technologies Ltd ($228.28K).

Institutional investors have sold a total of 3,492,499 shares in the last 24 months. This volume of shares sold represents approximately $87.57M in transactions.


Related Companies

Institutional ownership data for NASDAQ:AMPH is compiled from quarterly 13F filings submitted to the U.S. Securities and Exchange Commission (SEC), with the most recent received on 8/24/2026. New 13F filings are added each quarter as they're published.
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