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NASDAQ: AMPH
Amphastar Pharmaceuticals Inc Stock Ownership - Who owns Amphastar Pharmaceuticals?

OverviewForecastEarningsRevenueDividendOwnership

Insider buying vs selling

Have Amphastar Pharmaceuticals Inc insiders been buying or selling?

Buy
Sell
NameRoleDateSharesPriceValue
Richard K. PrinsDirector2025-11-254,179$27.10
$113.26kSell
Richard K. PrinsDirector2025-11-254,179$16.69
$69.75kBuy
Floyd F. PetersenDirector2025-11-1316,679$26.49
$441.84kSell
Floyd F. PetersenDirector2025-11-1316,679$16.69
$278.37kBuy
Floyd F. PetersenDirector2025-11-03500$25.27
$12.63kSell
Floyd F. PetersenDirector2025-10-01500$27.21
$13.60kSell
Floyd F. PetersenDirector2025-09-02500$30.98
$15.49kSell
Floyd F. PetersenDirector2025-08-01500$20.83
$10.42kSell
Floyd F. PetersenDirector2025-07-02500$23.47
$11.73kSell
Jack Y. ZhangCEO CHIEF SCIENTIFIC OFFICER2025-06-13200,000$13.03
$2.61MBuy

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Net Insider Buy/Sell (L12M) Ownership

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AMPH Shareholders

What type of owners hold Amphastar Pharmaceuticals Inc stock?

Institutional
Insider
Retail
NameHoldSharesValueType
Jack Y. Zhang38.11%17,511,932$468.79MInsider
Mary Z. Luo19.46%8,941,010$239.35MInsider
Applied Physics Chemistry Laboratories Inc15.95%7,327,679$196.16MInsider
Blackrock Inc11.94%5,485,057$146.83MInstitution
Vanguard Group Inc5.73%2,631,040$70.43MInstitution
Td Asset Management Inc4.20%1,931,892$51.72MInstitution
Dimensional Fund Advisors LP3.82%1,755,665$47.00MInstitution
State Street Corp3.27%1,500,742$40.17MInstitution
Fuller Thaler Asset Management Inc2.95%1,353,927$36.24MInstitution
Boston Trust Walden Corp2.55%1,173,107$31.40MInstitution

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AMPH vs Pharmaceutical Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
AMPH48.29%51.71%Net BuyingNet Selling
DVAX63.30%36.70%Net Selling
EVO5.56%0.00%
PCRX67.54%32.46%Net SellingNet Selling
CRON13.26%49.05%Net Selling
View Top Pharmaceutical Stocks

Amphastar Pharmaceuticals Stock Ownership FAQ

Who owns Amphastar Pharmaceuticals?

Amphastar Pharmaceuticals (NASDAQ: AMPH) is owned by 71.26% institutional shareholders, 76.31% Amphastar Pharmaceuticals insiders, and 0.00% retail investors. Jack Y. Zhang is the largest individual Amphastar Pharmaceuticals shareholder, owning 17.51M shares representing 38.11% of the company. Jack Y. Zhang's Amphastar Pharmaceuticals shares are currently valued at $468.79M.

If you're new to stock investing, here's how to buy Amphastar Pharmaceuticals stock.
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