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Amphastar Pharmaceuticals (AMPH) Institutional Ownership

Amphastar Pharmaceuticals logo
$25.37 -0.06 (-0.24%)
Closing price 04:00 PM Eastern
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$25.37 0.00 (0.00%)
As of 05:34 PM Eastern
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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)
100
Total
Institutional Inflows
(last 12 months)
$151.60M
Number of
Institutional Sellers
(last 12 months)
76
Total
Institutional Outflows
(last 12 months)
$86.44M
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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
9/9/2026Engineers Gate Manager LP30,191$609K0.0%N/A0.071%
9/9/2026Squarepoint Ops LLC78,795$1.59M0.0%+178.0%0.185%
8/18/2026Empowered Funds LLC162,812$3.29M0.0%N/A0.383%
8/17/2026Bank of America Corp DE136,824$2.76M0.0%N/A0.322%
8/15/2026Man Group plc17,342$350K0.0%N/A0.041%
8/15/2026Jupiter Topco LLC16,868$340K0.0%N/A0.040%
8/14/2026Canada Pension Plan Investment Board11,500$232K0.0%N/A0.027%
8/14/2026Legal & General Group Plc78,281$1.58M0.0%N/A0.184%
8/14/2026The Manufacturers Life Insurance Company14,247$288K0.0%N/A0.033%
8/14/2026Algert Global LLC131,400$2.65M0.0%+110.7%0.309%
8/12/2026Quantbot Technologies LP1,924$39K0.0%N/A0.005%
8/10/2026Denali Advisors LLC375,965$7.59M0.8%+41.1%0.884%
8/7/2026Deutsche Bank AG35,307$712K0.0%N/A0.080%
8/6/2026Bank of New York Mellon Corp232,343$4.69M0.0%N/A0.527%
8/6/2026State of Wyoming7,022$142K0.0%N/A0.016%
7/2/2026 CX Institutional1,259$25K0.0%-57.7%0.003%
6/18/2026Pacer Advisors Inc.261,483$5.12M0.0%+47.1%0.593%
5/22/2026Segall Bryant & Hamill LLC33,318$653K0.0%+197.9%0.076%
5/19/2026Bank 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%
5/18/2026Empowered Funds LLC181,332$3.55M0.0%+9.3%0.411%
5/15/2026Rice Hall James & Associates LLC187,348$3.67M0.2%+54.6%0.425%
5/15/2026Epoch Investment Partners Inc.898,895$17.61M0.1%-20.2%2.039%
5/14/2026Renaissance Technologies LLC553,900$10.85M0.0%+1.7%1.256%
5/14/2026Arrowstreet Capital Limited Partnership325,291$6.37M0.0%-41.9%0.738%
5/14/2026Systematic Financial Management LP452,898$8.87M0.2%+4.0%1.027%
5/13/2026First Trust Advisors LP150,591$2.95M0.0%+7.3%0.342%
5/12/2026Quantedge Capital Pte Ltd13,500$264K0.1%-85.3%0.031%
5/7/2026Dimensional Fund Advisors LP2,027,947$39.73M0.0%+12.7%4.554%
5/6/2026Assetmark Inc.53,738$1.05M0.0%-1.1%0.121%
5/6/2026Bessemer Group Inc.122,046$2.39M0.0%+1.0%0.274%
5/6/2026SteelPeak Wealth LLC48,462$949K0.0%-13.0%0.109%
5/5/2026Illinois Municipal Retirement Fund19,528$383K0.0%-6.6%0.044%
5/4/2026Principal Financial Group Inc.209,131$4.10M0.0%-4.1%0.470%
4/30/2026Hsbc Holdings PLC38,017$753K0.0%N/A0.085%
4/27/2026New York State Teachers Retirement System21,825$428K0.0%-5.0%0.049%
4/25/2026Boston Trust Walden Corp944,789$18.51M0.2%-13.1%2.122%
4/22/2026Sterling Capital Management LLC10,385$203K0.0%-37.4%0.023%
4/21/2026Louisiana State Employees Retirement System15,700$308K0.0%N/A0.035%
4/16/2026SG Americas Securities LLC32,806$643K0.0%-64.9%0.074%
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3/9/2026Corient Private Wealth LLC7,839$210K0.0%-50.1%0.017%
2/24/2026Pacer Advisors Inc.177,744$4.76M0.0%+2,864.4%0.387%
2/19/2026Invesco Ltd.501,404$13.43M0.0%+28.7%1.091%
2/19/2026Corient Private Wealth LLC15,339$411K0.0%-2.4%0.033%
2/18/2026Vident Advisory LLC20,409$547K0.0%+10.7%0.044%
2/18/2026State of Tennessee Department of Treasury8,619$228K0.0%-7.3%0.019%
2/18/2026Fuller & Thaler Asset Management Inc.1,394,463$37.34M0.1%+3.0%3.035%
2/18/2026Empowered Funds LLC165,907$4.44M0.0%+10.8%0.361%
2/18/2026XTX Topco Ltd48,607$1.30M0.0%N/A0.106%
2/18/2026Voloridge Investment Management LLC231,305$6.19M0.0%-20.9%0.503%
2/18/2026Susquehanna Portfolio Strategies LLC66,969$1.79M0.0%+69.3%0.146%
2/18/2026Millennium Management LLC290,673$7.78M0.0%-58.3%0.633%
2/18/2026Man Group plc14,151$379K0.0%-56.3%0.031%
2/18/2026Gotham Asset Management LLC27,802$745K0.0%+81.0%0.061%
2/18/2026Balyasny Asset Management L.P.77,467$2.08M0.0%-45.4%0.169%
2/18/2026Bridgeway Capital Management LLC323,549$8.67M0.2%+3.6%0.704%
2/17/2026Freestone Grove Partners LP27,593$739K0.0%N/A0.060%
2/17/2026AQR Capital Management LLC67,652$1.81M0.0%+8.9%0.147%
2/17/2026Quantedge Capital Pte Ltd91,700$2.46M1.2%+103.3%0.200%
2/17/2026Trexquant Investment LP113,673$3.04M0.0%N/A0.247%
2/17/2026Jump Financial LLC7,800$209K0.0%N/A0.017%
2/17/2026Price T Rowe Associates Inc. MD36,796$986K0.0%-86.6%0.080%
2/17/2026Clark Capital Management Group Inc.317,482$8.50M0.1%+11.9%0.691%
2/17/2026State of Wisconsin Investment Board17,506$469K0.0%-17.9%0.038%
2/17/2026ExodusPoint Capital Management LP14,929$400K0.0%N/A0.032%
2/17/2026Rice Hall James & Associates LLC121,176$3.25M0.2%-6.3%0.264%
2/16/2026Squarepoint Ops LLC14,860$398K0.0%-69.9%0.032%
2/16/2026MML Investors Services LLC14,661$393K0.0%+73.3%0.032%
2/16/2026Epoch Investment Partners Inc.1,126,585$30.17M0.2%-0.7%2.452%
2/16/2026Bridge City Capital LLC235,485$6.31M1.9%+72.8%0.512%
2/13/2026Marshall Wace LLP1,237,284$33.13M0.0%+41.6%2.693%
2/13/2026The Manufacturers Life Insurance Company 16,402$439K0.0%-7.7%0.036%
2/13/2026Corient IA LLC7,500$201K0.2%N/A0.016%
2/13/2026Public Sector Pension Investment Board122,505$3.28M0.0%-12.3%0.267%
2/13/2026Rafferty Asset Management LLC7,682$206K0.0%N/A0.017%
2/13/2026Arkadios Wealth Advisors26,303$704K0.0%-27.0%0.057%
2/13/2026First Trust Advisors LP140,310$3.76M0.0%-6.7%0.305%
2/13/2026Charles Schwab Investment Management Inc.350,707$9.39M0.0%-1.6%0.763%
2/13/2026State Street Corp1,531,786$41.02M0.0%+2.1%3.334%
2/13/2026Martingale Asset Management L P12,400$332K0.0%-33.0%0.027%
2/13/2026UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC55,232$1.48M0.0%+1.7%0.120%
2/12/2026MetLife Investment Management LLC21,075$564K0.0%-8.7%0.046%
2/12/2026Commonwealth Equity Services LLC8,742$234K0.0%+11.2%0.019%
2/12/2026Renaissance Technologies LLC544,700$14.59M0.0%-7.2%1.185%
2/12/2026Dimensional Fund Advisors LP1,799,685$48.20M0.0%+2.5%3.917%
2/12/2026Federated Hermes Inc.23,537$630K0.0%N/A0.051%
2/12/2026New York State Common Retirement Fund125,968$3.37M0.0%+39.7%0.274%
2/12/2026Fuller & Thaler Asset Management Inc.1,394,463$37.34M0.1%+3.0%3.035%
2/12/2026Campbell & CO Investment Adviser LLC30,682$822K0.0%-30.4%0.067%
2/12/2026Nuveen LLC76,101$2.04M0.0%-2.1%0.166%
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2/11/2026Empowered Funds LLC165,907$4.44M0.0%+10.8%0.361%
2/11/2026Janney Montgomery Scott LLC14,230$381K0.0%+6.2%0.031%
2/11/2026Deutsche Bank AG29,557$792K0.0%+4.1%0.064%
2/11/2026LPL Financial LLC19,844$531K0.0%+35.5%0.043%
2/11/2026Franklin Resources Inc.26,045$697K0.0%+173.4%0.057%
2/11/2026Brandywine Global Investment Management LLC105,417$2.82M0.0%N/A0.229%
2/11/2026O Shaughnessy Asset Management LLC87,183$2.34M0.0%+26.2%0.190%
2/11/2026Los Angeles Capital Management LLC19,397$478K0.0%+2.4%0.042%
2/11/2026Vestcor Inc16,383$439K0.0%+74.6%0.036%
2/11/2026State of Wyoming7,561$202K0.0%+129.1%0.016%


AMPH Institutional Ownership - Frequently Asked Questions

During the previous two years, 258 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 212 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), Millennium Management LLC ($690.78K), Dimensional Fund Advisors LP ($506.35K), CX Institutional ($444.42K), Marshall Wace LLP ($428.81K), and Boston Partners ($426.64K).

Institutional investors have bought a total of 6,062,103 shares in the last 24 months. This purchase volume represents approximately $151.60M in transactions.

Of the 76 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 3,443,399 shares in the last 24 months. This volume of shares sold represents approximately $86.44M 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 9/9/2026. New 13F filings are added each quarter as they're published.
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