Amphastar Pharmaceuticals (AMPH) Institutional Ownership $26.05 -0.87 (-3.23%) Closing price 06/11/2025 04:00 PM EasternExtended Trading$25.94 -0.12 (-0.44%) As of 07:00 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 Polygon.io. Learn more. Add Compare Share Share Ownership Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Institutional Ownership Changes (13F Filings) for Amphastar Pharmaceuticals (NASDAQ:AMPH)CurrentInstitutional OwnershipPercentage65.09%Number ofInstitutional Buyers(last 12 months)159TotalInstitutional Inflows(last 12 months)$375.70MNumber ofInstitutional Sellers(last 12 months)103TotalInstitutional Outflows(last 12 months)$285.27M Get AMPH Insider Trade Alerts Want to know when executives and insiders are buying or selling Amphastar Pharmaceuticals stock? Sign up for InsiderTrades.com's daily newsletter to get the latest insider transactions delivered to your inbox daily. Email Address Skip Chart & View Institutional Buying and Selling Data AMPH Institutional Buying and Selling by Quarter Amphastar Pharmaceuticals Major Shareholders & Ownership History Export to ExcelReporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails5/29/2025 Rhumbline Advisers88,958$2.58M0.0%+1.9%0.187% 5/20/2025 Intech Investment Management LLC60,289$1.75M0.0%+43.0%0.127% 5/19/2025 Jane Street Group LLC46,665$1.35M0.0%-53.1%0.098% 5/19/2025 UBS AM A Distinct Business Unit of UBS Asset Management Americas LLC79,089$2.29M0.0%-5.0%0.166% 5/16/2025 Aristeia Capital L.L.C.33,835$981K0.0%-21.7%0.071% 5/16/2025 Goldman Sachs Group Inc.406,712$11.79M0.0%-4.9%0.856% 5/16/2025 Millennium Management LLC868,551$25.18M0.0%+238.5%1.828% 5/16/2025 MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.22,489$652K0.0%+2.8%0.047% 5/16/2025 AQR Capital Management LLC53,638$1.56M0.0%+82.0%0.113% 5/16/2025 Amundi14,925$407K0.0%-23.8%0.031% Get the Latest News and Ratings for AMPH and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Amphastar Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. 5/15/2025 Royal Bank of Canada26,079$756K0.0%-8.9%0.055% 5/15/2025 Graham Capital Management L.P.26,424$766K0.0%N/A0.056% 5/15/2025 State of Wyoming4,860$141K0.0%N/A0.010% 5/15/2025 Trexquant Investment LP91,291$2.65M0.0%-13.5%0.192% 5/14/2025 Rafferty Asset Management LLC8,126$236K0.0%N/A0.017% 5/14/2025 Epoch Investment Partners Inc.1,261,307$36.57M0.2%+14.5%2.655% 5/14/2025 FORA Capital LLC6,903$200K0.0%N/A0.015% 5/14/2025 Corebridge Financial Inc.19,756$573K0.0%-3.4%0.042% 5/14/2025 Campbell & CO Investment Adviser LLC45,789$1.33M0.1%-3.7%0.096% 5/14/2025 Systematic Financial Management LP326,546$9.47M0.3%+32.6%0.687% 5/14/2025 Hotchkis & Wiley Capital Management LLC270,150$7.83M0.0%+13.7%0.569% 5/14/2025 AlphaQuest LLC11,593$336K0.0%+138.4%0.024% 5/14/2025 Martingale Asset Management L P24,542$711K0.0%-39.0%0.052% 5/14/2025 EntryPoint Capital LLC8,498$246K0.1%-37.8%0.018% 5/14/2025 BI Asset Management Fondsmaeglerselskab A S1,359$39K0.0%N/A0.003% 5/14/2025 Fuller & Thaler Asset Management Inc.1,263,598$36.63M0.1%+11.5%2.660% 5/14/2025 Quantbot Technologies LP21,109$612K0.0%-17.1%0.044% 5/14/2025 Wellington Management Group LLP16,913$490K0.0%-4.9%0.036% 5/13/2025 Northern Trust Corp594,437$17.23M0.0%-3.1%1.251% 5/13/2025 Algert Global LLC17,300$502K0.0%N/A0.036% 5/13/2025 Corient IA LLC7,500$217K0.2%N/A0.016% 5/13/2025 American Century Companies Inc.307,993$8.93M0.0%-34.7%0.648% 5/13/2025 Boston Partners423,070$11.94M0.0%-0.8%0.891% 5/13/2025 Russell Investments Group Ltd.2,058$60K0.0%+950.0%0.004% 5/12/2025 Public Sector Pension Investment Board118,885$3.45M0.0%+27.2%0.250% 5/12/2025 Nuveen LLC95,665$2.77M0.0%N/A0.201% 5/12/2025 Invesco Ltd.359,143$10.41M0.0%-87.2%0.756% 5/12/2025 Connor Clark & Lunn Investment Management Ltd.32,241$935K0.0%-52.1%0.068% 5/12/2025 Cynosure Group LLC12,401$360K0.0%+62.8%0.026% 5/12/2025 Swiss National Bank74,500$2.16M0.0%-2.5%0.157% Gold is soaring. 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Just a simple fund delivering monthly payouts — like clockwork.Click here to discover the income ETF behind it all.5/12/2025 Maryland State Retirement & Pension System10,936$317K0.0%-13.4%0.023% 5/9/2025 Deutsche Bank AG30,910$896K0.0%-9.3%0.065% 5/9/2025 Charles Schwab Investment Management Inc.326,226$9.46M0.0%-6.1%0.687% 5/9/2025 Vanguard Group Inc.2,422,904$70.24M0.0%-10.7%5.101% 5/9/2025 PNC Financial Services Group Inc.4,783$139K0.0%+13.8%0.010% 5/8/2025 Arkadios Wealth Advisors33,966$985K0.0%+21.5%0.072% 5/8/2025 XTX Topco Ltd18,358$532K0.0%N/A0.039% 5/8/2025 GSA Capital Partners LLP45,297$1.31M0.1%+159.8%0.095% 5/8/2025 Federated Hermes Inc.585,115$16.96M0.0%-28.9%1.232% 5/7/2025 Picton Mahoney Asset Management1,608$46K0.0%+6,600.0%0.003% 5/7/2025 TD Asset Management Inc2,212,142$64.13M0.1%+20.2%4.657% 5/6/2025 Pacer Advisors Inc.479,390$13.90M0.0%-64.5%1.009% 5/6/2025 Assetmark Inc.40,537$1.18M0.0%-3.3%0.085% 5/6/2025 Royce & Associates LP247,858$7.19M0.1%+2,684.3%0.522% 5/6/2025 Legato Capital Management LLC29,699$861K0.1%+60.9%0.063% 5/5/2025 IFP Advisors Inc1,158$34K0.0%N/A0.002% 5/5/2025 Hussman Strategic Advisors Inc.31,500$913K0.2%N/A0.066% 5/2/2025 Segall Bryant & Hamill LLC11,185$324K0.0%-40.8%0.024% 5/2/2025 Victory Capital Management Inc.81,087$2.35M0.0%+27.9%0.171% 5/2/2025 Hohimer Wealth Management LLC8,005$232K0.0%+6.9%0.017% 5/2/2025 Signaturefd LLC872$25K0.0%+147.7%0.002% 5/1/2025 Aurora Investment Counsel54,081$1.57M0.9%-1.1%0.114% 5/1/2025 New York State Common Retirement Fund81,565$2.37M0.0%+15.7%0.172% 5/1/2025 SteelPeak Wealth LLC55,795$1.62M0.1%N/A0.117% 4/30/2025 Cornerstone Investment Partners LLC8,028$233K0.0%-8.0%0.017% 4/30/2025 Significant Wealth Partners LLC10,215$296K0.2%+43.2%0.022% 4/30/2025 China Universal Asset Management Co. Ltd.9,644$280K0.0%-5.4%0.020% 4/28/2025 Principal Financial Group Inc.212,647$6.17M0.0%+2.2%0.448% 4/28/2025 Teacher Retirement System of Texas10,358$300K0.0%-10.3%0.022% 4/24/2025 Allspring Global Investments Holdings LLC15,326$434K0.0%+9.0%0.032% 4/24/2025 Oakworth Capital Inc.6,000$174K0.0%+19.5%0.013% 4/24/2025 Illinois Municipal Retirement Fund20,355$590K0.0%-2.9%0.043% 4/22/2025 Illumine Investment Management LLC26,530$769K0.6%+55.6%0.056% 4/22/2025 Cambridge Investment Research Advisors Inc.13,790$400K0.0%+14.0%0.029% 4/21/2025 Boston Trust Walden Corp1,215,624$35.24M0.3%+24.2%2.559% 4/21/2025 State of Alaska Department of Revenue20,781$602K0.0%-2.6%0.044% 4/17/2025 Exchange Traded Concepts LLC8,866$257K0.0%N/A0.019% 4/15/2025 CX Institutional82,147$2.38M0.1%N/A0.172% 4/15/2025 Assenagon Asset Management S.A.15,216$441K0.0%-90.6%0.032% 4/15/2025 GAMMA Investing LLC1,333$39K0.0%+46.6%0.003% 4/14/2025 Bridge City Capital LLC115,855$3.36M1.0%+65.3%0.243% 4/8/2025 Rhumbline Advisers88,958$2.58M0.0%+1.9%0.187% 4/7/2025 GAMMA Investing LLC38,644$1.12M0.0%+4,151.3%0.081% 3/24/2025 Wellington Management Group LLP17,784$660K0.0%-9.8%0.037% 3/18/2025 California State Teachers Retirement System36,369$1.35M0.0%-1.6%0.076% 2/19/2025 Invst LLC11,346$421K0.1%-21.2%0.024% 2/19/2025 GF Fund Management CO. LTD.1,010$38K0.0%N/A0.002% 2/17/2025 UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC83,231$3.09M0.0%-85.6%0.173% 2/17/2025 Voloridge Investment Management LLC143,436$5.33M0.0%+16.2%0.298% 2/17/2025 Squarepoint Ops LLC17,664$656K0.0%+208.0%0.037% The Trump Dump is starting; Get out of stocks now? (Ad)The first 365 days of the Trump presidency… Will be the best time to get rich in American history.If I’m right about this (like I was before) a modest $900 investment could grow to a life-changing a2/17/2025 Twinbeech Capital LP46,797$1.74M0.0%N/A0.097% 2/17/2025 Two Sigma Advisers LP85,900$3.19M0.0%-12.6%0.179% 2/17/2025 Two Sigma Investments LP98,184$3.65M0.0%-0.6%0.204% 2/17/2025 Systematic Financial Management LP246,348$9.15M0.2%N/A0.512% 2/17/2025 Silvercrest Asset Management Group LLC166,814$6.19M0.0%-1.0%0.347% 2/17/2025 Point72 Asset Management L.P.9,200$342K0.0%-76.3%0.019% 2/17/2025 ProShare Advisors LLC13,852$514K0.0%+27.2%0.029% 2/17/2025 Man Group plc21,825$810K0.0%N/A0.045% 2/17/2025Nuveen Asset Management LLC95,665$3.55M0.0%-54.0%0.199% 2/17/2025 Millennium Management LLC256,556$9.53M0.0%-1.2%0.534% (Data available from 1/1/2016 forward) AMPH Institutional Ownership - Frequently Asked Questions Who are the largest shareholders of AMPH shares? During the previous two years, 290 institutional investors and hedge funds held shares of Amphastar Pharmaceuticals. The most heavily invested institutionals were State Street Corp ($74.27M), Vanguard Group Inc. ($70.24M), TD Asset Management Inc ($64.13M), Dimensional Fund Advisors LP ($44.50M), Fuller & Thaler Asset Management Inc. ($36.63M), Epoch Investment Partners Inc. ($36.57M), and Boston Trust Walden Corp ($35.24M).Learn more on AMPH's institutional investors. What percentage of Amphastar Pharmaceuticals stock is owned by institutional investors? 65.09% of Amphastar Pharmaceuticals stock is owned by institutional investors. Learn more on AMPH's institutional investor holdings. Which institutional investors have been buying Amphastar Pharmaceuticals stock? Of the 244 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: TD Asset Management Inc ($1.85M), Pacer Advisors Inc. ($1.35M), Epoch Investment Partners Inc. ($1.24M), Boston Trust Walden Corp ($1.22M), Millennium Management LLC ($950.65K), Boston Partners ($426.64K), and Boone Capital Management LLC ($400K). How much institutional buying is happening at Amphastar Pharmaceuticals? Institutional investors have bought a total of 15,233,269 shares in the last 24 months. This purchase volume represents approximately $666.27M in transactions. Which Amphastar Pharmaceuticals major shareholders have been selling company stock? Of the 148 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: Invesco Ltd. ($2.59M), Federated Hermes Inc. ($1.66M), Pacer Advisors Inc. ($870.98K), Dimensional Fund Advisors LP ($662.15K), UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC ($497.36K), JPMorgan Chase & Co. ($385.35K), and Vanguard Group Inc. ($379.50K). How much institutional selling is happening at Amphastar Pharmaceuticals? Institutional investors have sold a total of 11,298,592 shares in the last 24 months. This volume of shares sold represents approximately $440.06M in transactions. 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