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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
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
Howard LeeDirector2025-06-03923$26.01
$24.01kSell
Floyd F. PetersenDirector2025-06-02500$25.67
$12.84kSell
William J. PetersCFO EVP TREASURER2025-05-19273$24.79
$6.77kSell
Floyd F. PetersenDirector2025-05-01500$24.08
$12.04kSell
Floyd F. PetersenDirector2025-04-01500$28.38
$14.19kSell

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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. Zhang37.15%17,511,932$406.63MInsider
Mary Z. Luo18.97%8,941,010$207.61MInsider
Applied Physics Chemistry Laboratories Inc15.54%7,327,679$170.15MInsider
Blackrock Inc12.03%5,668,793$131.63MInstitution
Vanguard Group Inc5.70%2,686,950$62.39MInstitution
Td Asset Management Inc4.32%2,034,930$47.25MInstitution
Dimensional Fund Advisors LP3.45%1,626,884$37.78MInstitution
State Street Corp3.34%1,576,233$36.60MInstitution
Fuller Thaler Asset Management Inc2.68%1,263,772$29.34MInstitution
Epoch Investment Partners Inc2.63%1,241,369$28.82MInstitution

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AMPH vs Pharmaceutical Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
AMPH48.28%51.72%Net BuyingNet Selling
COLL51.08%48.92%Net SellingNet Selling
DVAX63.58%36.42%Net SellingNet Selling
PCRX68.66%31.34%Net SellingNet Selling
CRON12.30%48.73%Net Selling
View Top Pharmaceutical Stocks

Amphastar Pharmaceuticals Stock Ownership FAQ

Who owns Amphastar Pharmaceuticals?

Amphastar Pharmaceuticals (NASDAQ: AMPH) is owned by 69.45% institutional shareholders, 74.39% Amphastar Pharmaceuticals insiders, and 0.00% retail investors. Jack Y. Zhang is the largest individual Amphastar Pharmaceuticals shareholder, owning 17.51M shares representing 37.15% of the company. Jack Y. Zhang's Amphastar Pharmaceuticals shares are currently valued at $416.43M.

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