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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
Jack Y. ZhangCEO CHIEF SCIENTIFIC OFFICER2026-03-159,784$18.18
$177.87kSell
William J. PetersCFO EVP TREASURER2026-03-151,973$18.18
$35.87kSell
Jack Y. ZhangCEO CHIEF SCIENTIFIC OFFICER2026-03-152,908$18.18
$52.87kSell
Rong ZhouSENIOR EVP PRODUCTION CENTER2026-03-151,225$18.18
$22.27kSell
William J. PetersCFO EVP TREASURER2026-03-103,297$18.91
$62.35kSell
Yakob LiawatidewiEVP CORP ADMIN CENTER2026-03-101,870$18.91
$35.36kSell
Jack Y. ZhangCEO CHIEF SCIENTIFIC OFFICER2026-03-1014,785$18.91
$279.58kSell
Jack Y. ZhangCEO CHIEF SCIENTIFIC OFFICER2026-03-104,395$18.91
$83.11kSell
Rong ZhouSENIOR EVP PRODUCTION CENTER2026-03-102,215$18.91
$41.89kSell
William J. PetersCFO EVP TREASURER2026-03-062,146$19.34
$41.50kSell

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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. Zhang38.91%17,654,325$342.67MInsider
Mary Z. Luo19.71%8,941,010$173.55MInsider
Applied Physics Chemistry Laboratories Inc16.15%7,327,679$142.23MInsider
Blackrock Inc12.04%5,462,015$106.02MInstitution
Vanguard Group Inc5.75%2,608,158$50.62MInstitution
Td Asset Management Inc4.33%1,963,052$38.10MInstitution
Dimensional Fund Advisors LP3.97%1,799,685$34.93MInstitution
State Street Corp3.38%1,531,786$29.73MInstitution
Fuller Thaler Asset Management Inc3.07%1,394,463$27.07MInstitution
Marshall Wace LLP2.73%1,237,284$24.02MInstitution

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AMPH vs Pharmaceutical Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
AMPH48.75%51.25%Net BuyingNet Selling
EVO5.54%0.00%
PCRX66.69%33.31%Net SellingNet Selling
TLRY9.64%17.71%Net BuyingNet Buying
CRON13.75%49.84%Net SellingNet Selling
View Top Pharmaceutical Stocks

Amphastar Pharmaceuticals Stock Ownership FAQ

Who owns Amphastar Pharmaceuticals?

Amphastar Pharmaceuticals (NASDAQ: AMPH) is owned by 74.04% institutional shareholders, 77.85% Amphastar Pharmaceuticals insiders, and 0.00% retail investors. Jack Y. Zhang is the largest individual Amphastar Pharmaceuticals shareholder, owning 17.65M shares representing 38.91% of the company. Jack Y. Zhang's Amphastar Pharmaceuticals shares are currently valued at $344.44M.

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