Free Trial
→ Leaked Gov’t Memo Reveals $100 Trillion Deadline (From Stansberry Research) (Ad) Free AMPH Stock Alerts

Amphastar Pharmaceuticals (AMPH) Institutional Ownership

Amphastar Pharmaceuticals logo
$21.21 +0.26 (+1.24%)
Closing price 08/1/2025 04:00 PM Eastern
Extended Trading
$21.38 +0.18 (+0.83%)
As of 08/1/2025 04:20 PM 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.
Compare

Institutional Ownership Changes (13F Filings) for Amphastar Pharmaceuticals (NASDAQ:AMPH)

Current
Institutional Ownership
Percentage
65.09%
Number of
Institutional Buyers
(last 12 months)
158
Total
Institutional Inflows
(last 12 months)
$352.28M
Number of
Institutional Sellers
(last 12 months)
101
Total
Institutional Outflows
(last 12 months)
$287.75M
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.

Skip Chart & View Institutional Buying and Selling Data

AMPH Institutional Buying and Selling by Quarter

Amphastar Pharmaceuticals Major Shareholders & Ownership History

Export to Excel
Reporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
8/1/2025 Y Intercept Hong Kong Ltd17,727$407K0.0%N/A0.038%
7/31/2025 AlphaQuest LLC28,882$663K0.1%+149.1%0.061%
7/30/2025 Aurora Investment Counsel53,253$1.22M0.6%-1.5%0.113%
7/29/2025 VIRGINIA RETIREMENT SYSTEMS ET Al8,762$201K0.0%N/A0.019%
7/29/2025 Nordea Investment Management AB152,015$3.49M0.0%+0.7%0.322%
7/28/2025 Boston Trust Walden Corp1,176,453$27.01M0.2%-3.2%2.496%
7/28/2025 TD Asset Management Inc2,034,930$46.72M0.0%-8.0%4.317%
7/25/2025 CWM LLC4,502$103K0.0%+574.0%0.010%
7/25/2025 Vanguard Personalized Indexing Management LLC12,624$290K0.0%+62.5%0.027%
7/24/2025 IFP Advisors Inc2,035$52K0.0%+75.7%0.004%
7/21/2025 Polaris Capital Management LLC35,100$806K0.1%+14.0%0.074%
7/16/2025 State of Alaska Department of Revenue21,892$502K0.0%+5.3%0.046%
7/16/2025 CX Institutional263,283$6.05M0.2%+220.5%0.559%
7/15/2025 Significant Wealth Partners LLC16,178$371K0.2%+58.4%0.034%
7/14/2025 GAMMA Investing LLC2,162$50K0.0%+62.2%0.005%
7/11/2025 CX Institutional263,283$6.05M0.2%+220.5%0.559%
7/11/2025 Assenagon Asset Management S.A.16,610$381K0.0%+9.2%0.035%
7/9/2025 MassMutual Private Wealth & Trust FSB1,262$29K0.0%+192.8%0.003%
6/18/2025Voya Investment Management LLC18,142$526K0.0%+8.1%0.038%
5/29/2025Rhumbline Advisers88,958$2.58M0.0%+1.9%0.187%
5/20/2025Intech Investment Management LLC60,289$1.75M0.0%+43.0%0.127%
5/19/2025Jane Street Group LLC46,665$1.35M0.0%-53.1%0.098%
5/19/2025UBS AM A Distinct Business Unit of UBS Asset Management Americas LLC79,089$2.29M0.0%-5.0%0.166%
5/16/2025Aristeia Capital L.L.C.33,835$981K0.0%-21.7%0.071%
5/16/2025Goldman Sachs Group Inc.406,712$11.79M0.0%-4.9%0.863%
5/16/2025Millennium Management LLC868,551$25.18M0.0%+238.5%1.828%
5/16/2025MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.22,489$652K0.0%+2.8%0.047%
5/16/2025AQR Capital Management LLC53,638$1.56M0.0%+82.0%0.113%
5/16/2025Amundi14,925$407K0.0%-23.8%0.031%
5/15/2025Royal Bank of Canada26,079$756K0.0%-8.9%0.055%
5/15/2025Graham Capital Management L.P.26,424$766K0.0%N/A0.056%
5/15/2025State of Wyoming4,860$141K0.0%N/A0.010%
5/15/2025Trexquant Investment LP91,291$2.65M0.0%-13.5%0.192%
5/14/2025Rafferty Asset Management LLC8,126$236K0.0%N/A0.017%
5/14/2025Epoch Investment Partners Inc.1,261,307$36.57M0.2%+14.5%2.655%
5/14/2025FORA Capital LLC6,903$200K0.0%N/A0.015%
5/14/2025Corebridge Financial Inc.19,756$573K0.0%-3.4%0.042%
5/14/2025Campbell & CO Investment Adviser LLC45,789$1.33M0.1%-3.7%0.096%
5/14/2025Systematic Financial Management LP326,546$9.47M0.3%+32.6%0.687%
5/14/2025Hotchkis & Wiley Capital Management LLC270,150$7.83M0.0%+13.7%0.569%
He Called Nvidia at $1.10. Now, He Says THIS Stock Will… (Ad)

The original Magnificent Seven returned 16,894%—turning $7K into $1.18 million. Now, the man who called Nvidia at $1.10 reveals AI’s Next Magnificent Seven… including one stock he says could become America’s next trillion-dollar giant.

See his full breakdown of the seven stocks to own now
5/14/2025 AlphaQuest LLC11,593$336K0.0%+138.4%0.024%
5/14/2025Martingale Asset Management L P24,542$711K0.0%-39.0%0.052%
5/14/2025EntryPoint Capital LLC8,498$246K0.1%-37.8%0.018%
5/14/2025BI Asset Management Fondsmaeglerselskab A S1,359$39K0.0%N/A0.003%
5/14/2025Fuller & Thaler Asset Management Inc.1,263,598$36.63M0.1%+11.5%2.660%
5/14/2025Quantbot Technologies LP21,109$612K0.0%-17.1%0.044%
5/14/2025Wellington Management Group LLP16,913$490K0.0%-4.9%0.036%
5/13/2025Northern Trust Corp594,437$17.23M0.0%-3.1%1.251%
5/13/2025Algert Global LLC17,300$502K0.0%N/A0.036%
5/13/2025Corient IA LLC7,500$217K0.2%N/A0.016%
5/13/2025American Century Companies Inc.307,993$8.93M0.0%-34.7%0.648%
5/13/2025Boston Partners423,070$11.94M0.0%-0.8%0.891%
5/13/2025Russell Investments Group Ltd.2,058$60K0.0%+950.0%0.004%
5/12/2025Public Sector Pension Investment Board118,885$3.45M0.0%+27.2%0.250%
5/12/2025Nuveen LLC95,665$2.77M0.0%N/A0.201%
5/12/2025Invesco Ltd.359,143$10.41M0.0%-87.2%0.756%
5/12/2025Connor Clark & Lunn Investment Management Ltd.32,241$935K0.0%-52.1%0.068%
5/12/2025Cynosure Group LLC12,401$360K0.0%+62.8%0.026%
5/12/2025Swiss National Bank74,500$2.16M0.0%-2.5%0.157%
5/12/2025 Maryland State Retirement & Pension System10,936$317K0.0%-13.4%0.023%
5/9/2025Deutsche Bank AG30,910$896K0.0%-9.3%0.065%
5/9/2025Charles Schwab Investment Management Inc.326,226$9.46M0.0%-6.1%0.687%
5/9/2025Vanguard Group Inc.2,422,904$70.24M0.0%-10.7%5.101%
5/9/2025PNC Financial Services Group Inc.4,783$139K0.0%+13.8%0.010%
5/8/2025Arkadios Wealth Advisors33,966$985K0.0%+21.5%0.072%
5/8/2025XTX Topco Ltd18,358$532K0.0%N/A0.039%
5/8/2025 GSA Capital Partners LLP45,297$1.31M0.1%+159.8%0.095%
5/8/2025Federated Hermes Inc.585,115$16.96M0.0%-28.9%1.232%
5/7/2025Picton 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%
5/6/2025Pacer Advisors Inc.479,390$13.90M0.0%-64.5%1.009%
5/6/2025Assetmark Inc.40,537$1.18M0.0%-3.3%0.085%
5/6/2025Royce & Associates LP247,858$7.19M0.1%+2,684.3%0.522%
5/6/2025Legato Capital Management LLC29,699$861K0.1%+60.9%0.063%
5/5/2025 IFP Advisors Inc1,158$34K0.0%N/A0.002%
5/5/2025Hussman Strategic Advisors Inc.31,500$913K0.2%N/A0.066%
5/2/2025Segall Bryant & Hamill LLC11,185$324K0.0%-40.8%0.024%
5/2/2025Victory Capital Management Inc.81,087$2.35M0.0%+27.9%0.171%
5/2/2025Hohimer 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%
5/1/2025New 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%
4/30/2025Cornerstone Investment Partners LLC8,028$233K0.0%-8.0%0.017%
4/30/2025 Significant Wealth Partners LLC10,215$296K0.2%+43.2%0.022%
4/30/2025China Universal Asset Management Co. Ltd.9,644$280K0.0%-5.4%0.020%
4/28/2025Principal 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%
He Called Nvidia at $1.10. Now, He Says THIS Stock Will… (Ad)

The original Magnificent Seven returned 16,894%—turning $7K into $1.18 million. Now, the man who called Nvidia at $1.10 reveals AI’s Next Magnificent Seven… including one stock he says could become America’s next trillion-dollar giant.

See his full breakdown of the seven stocks to own now
4/24/2025Illinois Municipal Retirement Fund20,355$590K0.0%-2.9%0.043%
4/22/2025Illumine 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%
4/14/2025Bridge City Capital LLC115,855$3.36M1.0%+65.3%0.243%
(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, 289 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 ($46.72M), Dimensional Fund Advisors LP ($44.50M), Fuller & Thaler Asset Management Inc. ($36.63M), Epoch Investment Partners Inc. ($36.57M), and Geode Capital Management LLC ($34.02M).Learn more on Amphastar Pharmaceuticals' 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 246 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), CX Institutional ($444.42K), and Boston Partners ($426.64K).

How much institutional buying is happening at Amphastar Pharmaceuticals?

Institutional investors have bought a total of 9,603,177 shares in the last 24 months. This purchase volume represents approximately $352.28M in transactions.

Which of Amphastar Pharmaceuticals' major shareholders have been selling company stock?

Of the 101 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. ($2.44M), Federated Hermes Inc. ($1.49M), Pacer Advisors Inc. ($870.98K), UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC ($497.36K), JPMorgan Chase & Co. ($385.35K), American Century Companies Inc. ($331.60K), and Vanguard Group Inc. ($291.72K).

How much institutional selling is happening at Amphastar Pharmaceuticals?

Institutional investors have sold a total of 8,642,644 shares in the last 24 months. This volume of shares sold represents approximately $287.75M in transactions.


Related Companies

This page (NASDAQ:AMPH) was last updated on 8/3/2025 by MarketBeat.com Staff
From Our Partners
Man Who Called Nvidia at $1.10 Says Buy This Now...
In 2004, one man called Nvidia before just about anyone knew it existed. Now, this same guy says a new comp...
The Oxford Club | Sponsored
Crypto Income (almost instantly)
How would you like to collect a small percentage of the $4 billion changing hands daily in the crypto market? ...
Awesomely, LLC | Sponsored
Ex-Hedge Fund Manager Uncovers $100 Trillion Land Shift
Trump's Radical New Plan Could Enrich Thousands This isn't a campaign stunt. It's a $100 trillion move to u...
Stansberry Research | Sponsored
Investigating the Most Controversial Stock on Earth
Tesla’s wild price swings may not be random after all. Hedge fund veteran Larry Benedict has uncovered a st...
Brownstone Research | Sponsored
This New Rule Could Change Everything
A major change is quietly going into effect this July — and Wall Street is already positioning for it. Big ...
American Alternative | Sponsored
Sell these "safe" blue chips immediately
Investing Legend Hints the End May be Near for These 3 Iconic Stocks One company to replace Amazon… another...
InvestorPlace | Sponsored
Too busy to trade? Good.
Too busy to trade? That might be your edge. This after-hours strategy is built for people who don’t sit at ...
Timothy Sykes | Sponsored
REVEALED FREE: Our top 3 stocks to own in 2025 and beyond
Every time Weiss Ratings flashed green like this, the average gain on each and every stock has been 303% (incl...
Weiss Ratings | Sponsored