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Amphastar Pharmaceuticals (AMPH) Institutional Ownership

Amphastar Pharmaceuticals logo
$24.72 +0.20 (+0.82%)
Closing price 10/23/2025 04:00 PM Eastern
Extended Trading
$24.69 -0.03 (-0.12%)
As of 10/23/2025 07:33 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.
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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)
166
Total
Institutional Inflows
(last 12 months)
$331.24M
Number of
Institutional Sellers
(last 12 months)
103
Total
Institutional Outflows
(last 12 months)
$301.44M
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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
10/23/2025CX Institutional63,316$1.69M0.1%-76.0%0.136%
10/22/2025 Louisiana State Employees Retirement System16,500$440K0.0%-4.1%0.035%
10/21/2025 Global Retirement Partners LLC1,024$27K0.0%+219.0%0.002%
10/20/2025 VIRGINIA RETIREMENT SYSTEMS ET Al13,562$361K0.0%+54.8%0.029%
10/17/2025 Boston Trust Walden Corp1,173,107$31.26M0.2%-0.3%2.523%
10/16/2025 Rice Hall James & Associates LLC129,339$3.45M0.2%N/A0.278%
10/15/2025 CWM LLC1,508$40K0.0%-66.5%0.003%
10/15/2025 Pacer Advisors Inc.5,996$160K0.0%-98.2%0.013%
10/14/2025 Yousif Capital Management LLC9,273$247K0.0%-16.3%0.020%
10/14/2025 Farther Finance Advisors LLC944$25K0.0%+356.0%0.002%
10/7/2025 Assenagon Asset Management S.A.15,216$406K0.0%-8.4%0.033%
10/2/2025 GAMMA Investing LLC1,223$33K0.0%-43.4%0.003%
9/24/2025Texas Permanent School Fund Corp54,482$1.25M0.0%+5.0%0.117%
9/4/2025Osaic Holdings Inc.15,236$357K0.0%-5.6%0.033%
8/27/2025Squarepoint Ops LLC23,026$529K0.0%-67.0%0.050%
8/26/2025Thrivent Financial for Lutherans27,036$621K0.0%-1.9%0.058%
8/19/2025Cim LLC11,429$262K0.0%+15.6%0.025%
8/19/2025State of Wyoming2,723$63K0.0%-44.0%0.006%
8/19/2025Hohimer Wealth Management LLC11,845$272K0.0%+48.0%0.025%
8/16/2025Public Sector Pension Investment Board125,363$2.88M0.0%+5.4%0.270%
8/15/2025CANADA LIFE ASSURANCE Co30,216$694K0.0%-3.3%0.065%
8/15/2025Tower Research Capital LLC TRC 3,583$82K0.0%+263.0%0.008%
8/15/2025Vident Advisory LLC17,279$397K0.0%N/A0.037%
8/15/2025Man Group plc20,300$466K0.0%-46.9%0.044%
8/15/2025Engineers Gate Manager LP53,348$1.23M0.0%+38.4%0.115%
8/15/2025BNP Paribas Financial Markets71,689$1.65M0.0%+802.3%0.154%
8/15/2025Bridgeway Capital Management LLC85,112$1.95M0.0%N/A0.183%
8/15/2025Brevan Howard Capital Management LP48,920$1.12M0.0%+469.8%0.105%
8/15/2025Balyasny Asset Management L.P.266,306$6.11M0.0%+64.2%0.573%
8/15/2025Bank of America Corp DE145,125$3.33M0.0%+31.1%0.312%
8/15/2025Ameriprise Financial Inc.169,849$3.90M0.0%+9.5%0.365%
8/14/2025PDT Partners LLC14,630$336K0.0%N/A0.031%
8/14/2025California State Teachers Retirement System35,877$824K0.0%-1.4%0.077%
8/14/2025Canada Pension Plan Investment Board4,200$96K0.0%+55.6%0.009%
8/14/2025Occudo Quantitative Strategies LP15,774$362K0.0%N/A0.034%
8/14/2025Quantinno Capital Management LP11,269$259K0.0%N/A0.024%
8/14/2025MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.20,338$467K0.0%-9.6%0.044%
8/14/2025The Manufacturers Life Insurance Company 18,688$429K0.0%-5.7%0.040%
8/14/2025Qube Research & Technologies Ltd469,492$10.78M0.0%+81.3%1.010%
8/14/2025Federated Hermes Inc.11,224$258K0.0%-98.1%0.024%
8/13/2025Marshall Wace LLP848,685$19.49M0.0%-17.7%1.825%
8/13/2025Epoch Investment Partners Inc.1,241,369$28.50M0.1%-1.6%2.670%
8/13/2025Bridge City Capital LLC138,644$3.18M0.9%+19.7%0.298%
8/13/2025First Trust Advisors LP94,305$2.17M0.0%+428.3%0.203%
8/13/2025Invesco Ltd.386,971$8.89M0.0%+7.7%0.832%
8/13/2025Systematic Financial Management LP359,307$8.25M0.2%+10.0%0.773%
8/13/2025Arrowstreet Capital Limited Partnership81,239$1.87M0.0%N/A0.175%
8/13/2025Quantbot Technologies LP60,955$1.40M0.0%+188.8%0.131%
8/13/2025Edgestream Partners L.P.37,112$852K0.0%N/A0.080%
8/13/2025New York State Common Retirement Fund48,369$1.11M0.0%-40.7%0.104%
8/13/2025Capital Fund Management S.A.40,570$931K0.0%N/A0.087%
8/12/2025Prudential Financial Inc.41,951$963K0.0%+11.5%0.090%
8/12/2025 Cynosure Group LLC17,820$409K0.0%+43.7%0.038%
8/12/2025American Century Companies Inc.233,161$5.35M0.0%-24.3%0.502%
8/12/2025Rhumbline Advisers95,287$2.19M0.0%+7.1%0.205%
8/12/2025Legal & General Group Plc101,154$2.32M0.0%-0.4%0.218%
8/12/2025Magnetar Financial LLC13,337$306K0.0%N/A0.029%
8/12/2025Swiss National Bank72,600$1.67M0.0%-2.6%0.156%
8/12/2025Dynamic Technology Lab Private Ltd33,300$765K0.1%N/A0.072%
8/8/2025Intech Investment Management LLC51,071$1.17M0.0%-15.3%0.108%
8/8/2025Creative Planning42,620$979K0.0%+111.8%0.090%
8/8/2025SG Americas Securities LLC24,448$561K0.0%N/A0.052%
8/8/2025Commonwealth of Pennsylvania Public School Empls Retrmt SYS9,440$217K0.0%+5.2%0.020%
8/8/2025Geode Capital Management LLC973,237$22.35M0.0%+1.9%2.065%
8/8/2025PNC Financial Services Group Inc.6,483$149K0.0%+35.5%0.014%
8/7/2025ProShare Advisors LLC10,039$230K0.0%-9.4%0.021%
8/7/2025Profund Advisors LLC9,638$221K0.0%-14.4%0.020%
8/7/2025Campbell & CO Investment Adviser LLC22,433$515K0.0%-51.0%0.048%
8/6/2025Fox Run Management L.L.C.21,199$487K0.1%N/A0.045%
8/5/2025Bank of Montreal Can11,790$271K0.0%+43.7%0.025%
8/4/2025Assetmark Inc.43,766$1.01M0.0%+8.0%0.093%
8/4/2025Hantz Financial Services Inc.1,377$32K0.0%+3,430.8%0.003%
8/4/2025Arkadios Wealth Advisors35,163$807K0.0%+3.5%0.075%
8/1/2025Y Intercept Hong Kong Ltd17,727$407K0.0%N/A0.038%
7/31/2025AlphaQuest LLC28,882$663K0.1%+149.1%0.061%
7/30/2025Aurora Investment Counsel53,253$1.22M0.6%-1.5%0.113%
7/29/2025 VIRGINIA RETIREMENT SYSTEMS ET Al8,762$201K0.0%N/A0.019%
7/29/2025Nordea 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%
7/28/2025TD Asset Management Inc2,034,930$46.72M0.0%-8.0%4.317%
7/25/2025 CWM LLC4,502$103K0.0%+574.0%0.010%
7/25/2025Vanguard Personalized Indexing Management LLC12,624$290K0.0%+62.5%0.027%
7/24/2025IFP Advisors Inc2,035$52K0.0%+75.7%0.004%
7/21/2025Polaris Capital Management LLC35,100$806K0.1%+14.0%0.074%
7/16/2025State of Alaska Department of Revenue21,892$502K0.0%+5.3%0.046%
7/16/2025CX Institutional263,283$6.05M0.2%+220.5%0.559%
7/15/2025Significant Wealth Partners LLC16,178$371K0.2%+58.4%0.034%
7/14/2025 GAMMA Investing LLC2,162$50K0.0%+62.2%0.005%
7/11/2025CX 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%
(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), Boston Trust Walden Corp ($31.26M), and Epoch Investment Partners Inc. ($28.50M).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 9,102,592 shares in the last 24 months. This purchase volume represents approximately $305.01M in transactions.

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

Of the 102 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. ($1.19M), 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 9,594,973 shares in the last 24 months. This volume of shares sold represents approximately $301.42M in transactions.


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This page (NASDAQ:AMPH) was last updated on 10/24/2025 by MarketBeat.com Staff
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