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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. PetersenDirector2025-07-02500$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
Jack Y. ZhangCEO CHIEF SCIENTIFIC OFFICER2025-03-1716,150$27.69
$447.19kSell
William J. PetersCFO EVP TREASURER2025-03-173,004$27.69
$83.18kSell
Jack Y. ZhangCEO CHIEF SCIENTIFIC OFFICER2025-03-177,223$27.69
$200.00kSell

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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$379.31MInsider
Mary Z. Luo18.97%8,941,010$193.66MInsider
Applied Physics Chemistry Laboratories Inc15.54%7,327,679$158.72MInsider
Blackrock Inc13.04%6,147,658$133.16MInstitution
Vanguard Group Inc5.14%2,422,904$52.48MInstitution
Td Asset Management Inc4.69%2,212,142$47.91MInstitution
State Street Corp3.40%1,604,614$34.76MInstitution
Dimensional Fund Advisors LP2.88%1,356,360$29.38MInstitution
Fuller Thaler Asset Management Inc2.68%1,263,598$27.37MInstitution
Epoch Investment Partners Inc2.68%1,261,307$27.32MInstitution

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AMPH vs Pharmaceutical Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
AMPH48.67%51.33%Net BuyingNet Buying
COLL56.76%43.24%Net SellingNet Buying
PCRX68.64%31.36%Net SellingNet Selling
AVDL80.36%13.61%Net Buying
CRON11.46%48.72%Net SellingNet Selling
View Top Pharmaceutical Stocks

Amphastar Pharmaceuticals Stock Ownership FAQ

Who owns Amphastar Pharmaceuticals?

Amphastar Pharmaceuticals (NASDAQ: AMPH) is owned by 70.54% institutional shareholders, 74.38% 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 $379.31M.

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