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Amphastar Pharmaceuticals (AMPH) Institutional Ownership

Amphastar Pharmaceuticals logo
$17.30 -1.02 (-5.57%)
Closing price 05/14/2026 04:00 PM Eastern
Extended Trading
$17.19 -0.11 (-0.64%)
As of 04:21 AM Eastern
Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours 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)
128
Total
Institutional Inflows
(last 12 months)
$183.08M
Number of
Institutional Sellers
(last 12 months)
93
Total
Institutional Outflows
(last 12 months)
$116.79M
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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
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%
5/14/2026 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%
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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%
3/9/2026Corient Private Wealth LLC7,839$210K0.0%-50.1%0.017%
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%
2/19/2026Corient 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%
2/17/2026 Quantedge 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%
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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%
2/16/2026 MML 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%
2/16/2026 Bridge 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%
2/13/2026 Public 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%
2/13/2026 First 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%
2/13/2026 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%
2/12/2026MetLife Investment Management LLC21,075$564K0.0%-8.7%0.046%
2/12/2026 Commonwealth Equity Services LLC8,742$234K0.0%+11.2%0.019%
2/12/2026Renaissance 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%
2/12/2026Fuller & 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%
2/12/2026 Nuveen LLC76,101$2.04M0.0%-2.1%0.166%
2/11/2026Empowered Funds LLC165,907$4.44M0.0%+10.8%0.361%
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%
2/10/2026Cibc World Market Inc.62,192$1.67M0.0%N/A0.135%
2/10/2026 TD Asset Management Inc1,963,052$52.57M0.0%+1.6%4.272%
2/10/2026 Commonwealth of Pennsylvania Public School Empls Retrmt SYS8,760$235K0.0%-3.9%0.019%
2/10/2026 Intech Investment Management LLC63,232$1.69M0.0%+23.6%0.138%
2/9/2026Geode Capital Management LLC886,825$23.75M0.0%-3.9%1.930%
2/9/2026 Royce & Associates LP352,297$9.44M0.1%-3.8%0.767%
2/9/2026 Hantz Financial Services Inc.4,484$120K0.0%+43.6%0.010%
2/9/2026 Systematic Financial Management LP435,580$11.67M0.3%+2.9%0.948%
2/6/2026Legato Capital Management LLC26,590$712K0.1%-26.3%0.058%
2/6/2026 LSV Asset Management110,300$2.95M0.0%+50.5%0.240%
2/6/2026 IFP Advisors Inc970$26K0.0%-38.2%0.002%
2/6/2026 ProShare Advisors LLC9,083$243K0.0%+5.3%0.020%
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2/5/2026 TD Private Client Wealth LLC2,418$65K0.0%+410.1%0.005%
2/4/2026 Ameritas Advisory Services LLC9,186$246K0.0%N/A0.020%
2/4/2026VIRGINIA RETIREMENT SYSTEMS ET Al12,362$331K0.0%-8.8%0.027%
2/3/2026 Denali Advisors LLC211,765$5.67M0.6%+56.9%0.461%
1/29/2026 UBS Group AG256,624$6.87M0.0%-17.8%0.558%
1/29/2026 Teachers Retirement System of The State of Kentucky9,053$242K0.0%-14.0%0.020%
1/29/2026Vanguard Group Inc.2,608,158$69.85M0.0%-0.9%5.676%
1/29/2026 Polaris Capital Management LLC35,532$952K0.1%+171.2%0.077%
1/29/2026 China Universal Asset Management Co. Ltd.7,488$201K0.0%-8.1%0.016%
1/28/2026 Arizona State Retirement System10,428$279K0.0%-6.4%0.023%


AMPH Institutional Ownership - Frequently Asked Questions

During the previous two years, 274 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 Epoch Investment Partners Inc. ($30.17M).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 227 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. ($1.52M), Boston Trust Walden Corp ($1.22M), TD Asset Management Inc ($1.08M), Millennium Management LLC ($1.03M), Marshall Wace LLP ($655.94K), Epoch Investment Partners Inc. ($646.36K), and Dimensional Fund Advisors LP ($506.35K).

Institutional investors have bought a total of 7,139,569 shares in the last 24 months. This purchase volume represents approximately $183.98M in transactions.

Of the 93 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: Federated Hermes Inc. ($573.89K), Millennium Management LLC ($407.09K), Pacer Advisors Inc. ($320.10K), TD Asset Management Inc ($280.25K), Boston Trust Walden Corp ($270.84K), Price T Rowe Associates Inc. MD ($238.43K), and Arrowstreet Capital Limited Partnership ($234.14K).

Institutional investors have sold a total of 4,529,089 shares in the last 24 months. This volume of shares sold represents approximately $112.82M in transactions.


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This page (NASDAQ:AMPH) was last updated on 5/15/2026 by MarketBeat.com Staff.
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