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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
Howard LeeDirector2026-06-02769$18.45
$14.19kSell
Rong ZhouSENIOR EVP PRODUCTION CENTER2026-03-151,225$18.18
$22.27kSell
Yakob LiawatidewiEVP CORP ADMIN CENTER2026-03-151,033$18.18
$18.78kSell
William J. PetersCFO EVP TREASURER2026-03-151,973$18.18
$35.87kSell
Jack Y. ZhangCEO CHIEF SCIENTIFIC OFFICER2026-03-159,784$18.18
$177.87kSell
Jack Y. ZhangCEO CHIEF SCIENTIFIC OFFICER2026-03-152,908$18.18
$52.87kSell
William J. PetersCFO EVP TREASURER2026-03-103,297$18.91
$62.35kSell
Rong ZhouSENIOR EVP PRODUCTION CENTER2026-03-102,215$18.91
$41.89kSell
Jack Y. ZhangCEO CHIEF SCIENTIFIC OFFICER2026-03-104,395$18.91
$83.11kSell
Jack Y. ZhangCEO CHIEF SCIENTIFIC OFFICER2026-03-1014,785$18.91
$279.58kSell

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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. Zhang40.04%17,654,325$347.97MInsider
Mary Z. Luo20.28%8,941,010$176.23MInsider
Applied Physics Chemistry Laboratories Inc16.62%7,327,679$144.43MInsider
Blackrock Inc12.30%5,421,343$106.85MInstitution
Dimensional Fund Advisors LP4.60%2,027,947$39.97MInstitution
State Street Corp3.65%1,607,515$31.68MInstitution
Vanguard Capital Management LLC3.50%1,543,655$30.43MInstitution
Td Asset Management Inc3.49%1,541,044$30.37MInstitution
Fuller Thaler Asset Management Inc3.16%1,395,139$27.50MInstitution
Marshall Wace LLP2.33%1,025,640$20.22MInstitution

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AMPH vs Pharmaceutical Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
AMPH47.57%52.43%Net SellingNet Selling
ETON64.92%23.13%Net SellingNet Selling
PCRX64.90%35.10%Net SellingNet Selling
BIOA77.14%22.26%Net SellingNet Buying
ESPR67.74%16.69%Net Selling
View Top Pharmaceutical Stocks

Amphastar Pharmaceuticals Stock Ownership FAQ

Who owns Amphastar Pharmaceuticals?

Amphastar Pharmaceuticals (NASDAQ: AMPH) is owned by 72.76% institutional shareholders, 80.20% Amphastar Pharmaceuticals insiders, and 0.00% retail investors. Jack Y. Zhang is the largest individual Amphastar Pharmaceuticals shareholder, owning 17.65M shares representing 40.04% of the company. Jack Y. Zhang's Amphastar Pharmaceuticals shares are currently valued at $352.38M.

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