Free Trial
→ College grad makes $64,000 a month (From Stansberry Research) (Ad)tc pixel Free AMPH Stock Alerts

Amphastar Pharmaceuticals (AMPH) Institutional Ownership

Amphastar Pharmaceuticals logo
$28.06 -0.62 (-2.16%)
Closing price 04:00 PM Eastern
Extended Trading
$28.04 -0.01 (-0.05%)
As of 04:57 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)
168
Total
Institutional Inflows
(last 12 months)
$333.49M
Number of
Institutional Sellers
(last 12 months)
103
Total
Institutional Outflows
(last 12 months)
$289.73M
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.

Subscribe Now
By entering your phone number and clicking the sign-up button, you agree to receive periodic text messages from MarketBeat at the phone number you submitted, including texts that may be sent using an automatic telephone dialing system. Message and data rates may apply. Message frequency will vary. Messages will consist of stock alerts, news stories, and partner advertisements/offers. Consent is not a condition of the purchase of any goods or services. Text HELP for help/customer support. Unsubscribe at any time by replying "STOP" to any text message that you receive from MarketBeat or by visiting our mailing preferences page. Read our full terms of service and privacy policy.
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
9/4/2025 Osaic Holdings Inc.15,236$357K0.0%-5.6%0.033%
8/27/2025 Squarepoint Ops LLC23,026$529K0.0%-67.0%0.050%
8/26/2025 Thrivent Financial for Lutherans27,036$621K0.0%-1.9%0.058%
8/19/2025 Cim LLC11,429$262K0.0%+15.6%0.025%
8/19/2025 State of Wyoming2,723$63K0.0%-44.0%0.006%
8/19/2025 Hohimer Wealth Management LLC11,845$272K0.0%+48.0%0.025%
8/16/2025 Public Sector Pension Investment Board125,363$2.88M0.0%+5.4%0.270%
8/15/2025 CANADA LIFE ASSURANCE Co30,216$694K0.0%-3.3%0.065%
8/15/2025 Tower Research Capital LLC TRC 3,583$82K0.0%+263.0%0.008%
8/15/2025 Vident Advisory LLC17,279$397K0.0%N/A0.037%
8/15/2025 Man Group plc20,300$466K0.0%-46.9%0.044%
8/15/2025 Engineers Gate Manager LP53,348$1.23M0.0%+38.4%0.115%
8/15/2025 BNP Paribas Financial Markets71,689$1.65M0.0%+802.3%0.154%
8/15/2025 Bridgeway Capital Management LLC85,112$1.95M0.0%N/A0.183%
8/15/2025 Brevan Howard Capital Management LP48,920$1.12M0.0%+469.8%0.105%
8/15/2025 Balyasny Asset Management L.P.266,306$6.11M0.0%+64.2%0.573%
8/15/2025 Bank of America Corp DE145,125$3.33M0.0%+31.1%0.312%
8/15/2025 Ameriprise Financial Inc.169,849$3.90M0.0%+9.5%0.365%
8/14/2025 PDT Partners LLC14,630$336K0.0%N/A0.031%
8/14/2025 California State Teachers Retirement System35,877$824K0.0%-1.4%0.077%
8/14/2025 Canada Pension Plan Investment Board4,200$96K0.0%+55.6%0.009%
8/14/2025 Occudo Quantitative Strategies LP15,774$362K0.0%N/A0.034%
8/14/2025 Quantinno Capital Management LP11,269$259K0.0%N/A0.024%
8/14/2025 MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.20,338$467K0.0%-9.6%0.044%
8/14/2025 The Manufacturers Life Insurance Company 18,688$429K0.0%-5.7%0.040%
8/14/2025 Qube Research & Technologies Ltd469,492$10.78M0.0%+81.3%1.010%
8/14/2025 Federated Hermes Inc.11,224$258K0.0%-98.1%0.024%
8/13/2025 Marshall Wace LLP848,685$19.49M0.0%-17.7%1.825%
8/13/2025 Epoch Investment Partners Inc.1,241,369$28.50M0.1%-1.6%2.670%
8/13/2025 Bridge City Capital LLC138,644$3.18M0.9%+19.7%0.298%
8/13/2025 First Trust Advisors LP94,305$2.17M0.0%+428.3%0.203%
8/13/2025 Invesco Ltd.386,971$8.89M0.0%+7.7%0.832%
8/13/2025 Systematic Financial Management LP359,307$8.25M0.2%+10.0%0.773%
8/13/2025 Arrowstreet Capital Limited Partnership81,239$1.87M0.0%N/A0.175%
8/13/2025 Quantbot Technologies LP60,955$1.40M0.0%+188.8%0.131%
8/13/2025 Edgestream Partners L.P.37,112$852K0.0%N/A0.080%
8/13/2025 New York State Common Retirement Fund48,369$1.11M0.0%-40.7%0.104%
8/13/2025 Capital Fund Management S.A.40,570$931K0.0%N/A0.087%
8/12/2025 Prudential Financial Inc.41,951$963K0.0%+11.5%0.090%
8/12/2025 Cynosure Group LLC17,820$409K0.0%+43.7%0.038%
8/12/2025 American Century Companies Inc.233,161$5.35M0.0%-24.3%0.502%
8/12/2025 Rhumbline Advisers95,287$2.19M0.0%+7.1%0.205%
8/12/2025 Legal & General Group Plc101,154$2.32M0.0%-0.4%0.218%
8/12/2025 Magnetar Financial LLC13,337$306K0.0%N/A0.029%
8/12/2025 Swiss National Bank72,600$1.67M0.0%-2.6%0.156%
8/12/2025 Dynamic Technology Lab Private Ltd33,300$765K0.1%N/A0.072%
8/8/2025 Intech Investment Management LLC51,071$1.17M0.0%-15.3%0.108%
8/8/2025 Creative Planning42,620$979K0.0%+111.8%0.090%
8/8/2025 SG Americas Securities LLC24,448$561K0.0%N/A0.052%
8/8/2025 Commonwealth of Pennsylvania Public School Empls Retrmt SYS9,440$217K0.0%+5.2%0.020%
8/8/2025 Geode Capital Management LLC973,237$22.35M0.0%+1.9%2.065%
8/8/2025 PNC Financial Services Group Inc.6,483$149K0.0%+35.5%0.014%
8/7/2025 ProShare Advisors LLC10,039$230K0.0%-9.4%0.021%
8/7/2025 Profund Advisors LLC9,638$221K0.0%-14.4%0.020%
8/7/2025 Campbell & CO Investment Adviser LLC22,433$515K0.0%-51.0%0.048%
8/6/2025 Fox Run Management L.L.C.21,199$487K0.1%N/A0.045%
8/5/2025 Bank of Montreal Can11,790$271K0.0%+43.7%0.025%
8/4/2025 Assetmark Inc.43,766$1.01M0.0%+8.0%0.093%
8/4/2025 Hantz Financial Services Inc.1,377$32K0.0%+3,430.8%0.003%
8/4/2025 Arkadios Wealth Advisors35,163$807K0.0%+3.5%0.075%
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%
6/18/2025 Voya 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%
(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, 294 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. ($28.50M), and Boston Trust Walden Corp ($27.01M).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 251 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 ($1.70M), Pacer Advisors Inc. ($1.35M), Boston Trust Walden Corp ($1.22M), Epoch Investment Partners Inc. ($1.11M), 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 9,628,554 shares in the last 24 months. This purchase volume represents approximately $333.49M in transactions.

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

Of the 103 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. ($1.94M), Pacer Advisors Inc. ($870.98K), UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC ($497.36K), American Century Companies Inc. ($406.43K), JPMorgan Chase & Co. ($385.35K), and Vanguard Group Inc. ($291.72K).

How much institutional selling is happening at Amphastar Pharmaceuticals?

Institutional investors have sold a total of 9,116,247 shares in the last 24 months. This volume of shares sold represents approximately $289.73M in transactions.


Related Companies

This page (NASDAQ:AMPH) was last updated on 9/12/2025 by MarketBeat.com Staff
From Our Partners
Trump’s national nightmare is here
Porter Stansberry and Jeff Brown say a new U.S. national emergency is already underway — and it could trigger ...
Porter & Company | Sponsoredtc pixel
Stunning new initiative unfolding in the White House?
what I just learned about what’s unfolding in the White House is truly stunning… And you need to see it for...
Paradigm Press | Sponsoredtc pixel
Forget NVDA. Put $1,000 into this stock now
A massive money shift is underway in the AI market. And it's opening up an extraordinary opportunity in a NEW ...
Chaikin Analytics | Sponsoredtc pixel
6-Figure Target for BTC by 2025
Trump Just Signed the GENIUS Act—One Coin is About to Explode We're at the BEGINNING of smart money really ...
Crypto 101 Media | Sponsoredtc pixel
Elon’s Secret Social Security Bombshell
To All Americans Born Before April 16th, 1963: Did Trump Just Give The Green Light To Radically RE-DO Social S...
Banyan Hill Publishing | Sponsoredtc pixel
Do NOT Day Trade (Do THIS instead)
Forget day trading (especially in markets like these). Trade OVERNIGHT instead! I've uncovered a shockin...
Monument Traders Alliance | Sponsoredtc pixel
INVESTOR ALERT: Tiny “$3 AI Wonder Stock” on the Verge of Blasting Off
Right now, we’re witnessing a monumental shift in the world.
Traders Agency | Sponsoredtc pixel
Forget Tesla — This Tiny AI Stock Is Musk’s Real Play
While Wall Street focused on Tesla’s earnings, Elon Musk was quietly building a supercomputer so powerful it c...
Behind the Markets | Sponsoredtc pixel