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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
William J. PetersCFO;Treas;EVP2026-09-214,139$25.00
$103.48kSell
Rong ZhouEVP2026-09-1610,000$23.94
$239.40kSell
Rong ZhouEVP2026-09-1610,000$13.35
$133.50kBuy
Rong ZhouEVP2026-09-023,187$23.63
$75.31kSell
Richard K. PrinsDirector2026-08-117,973$20.30
$161.85kSell
William J. PetersCFO;Treas;EVP2026-08-078,180$22.48
$183.89kSell
William J. PetersCFO;Treas;EVP2026-08-075,053$19.79
$100.00kBuy
Howard LeeDirector2026-06-02769$18.45
$14.19kSell
Rong ZhouSENIOR EVP PRODUCTION CENTER2026-03-151,225$18.18
$22.27kSell
Jack Y. ZhangCEO CHIEF SCIENTIFIC OFFICER2026-03-159,784$18.18
$177.87kSell

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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. Zhang41.50%17,654,325$489.38MInsider
Mary Z. Luo21.02%8,941,010$247.84MInsider
Applied Physics Chemistry Laboratories Inc17.23%7,327,679$203.12MInsider
Richard Koo0.66%279,289$7.74MInsider
Rong Zhou0.43%184,203$5.11MInsider
Jason B. Shandell0.42%179,276$4.97MInsider
William J. Peters0.40%168,707$4.68MInsider
Howard Lee0.37%159,350$4.42MInsider
Yakob Liawatidewi0.30%126,810$3.52MInsider
Marilyn J. Purchase0.18%76,990$2.13MInsider

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AMPH vs Pharmaceutical Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
AMPH0.07%83.12%Net SellingNet Selling
CRON0.01%51.30%Net Selling
HROW0.04%99.96%Net SellingNet Buying
PCRX0.11%58.80%Net SellingNet Selling
ETON0.07%31.65%Net SellingNet Selling
View Top Pharmaceutical Stocks

Amphastar Pharmaceuticals Stock Ownership FAQ

Who owns Amphastar Pharmaceuticals?

Amphastar Pharmaceuticals (NASDAQ: AMPH) is owned by 0.07% institutional shareholders, 83.12% Amphastar Pharmaceuticals insiders, and 16.81% retail investors. Jack Y. Zhang is the largest individual Amphastar Pharmaceuticals shareholder, owning 17.65M shares representing 41.50% of the company. Jack Y. Zhang's Amphastar Pharmaceuticals shares are currently valued at $477.20M.

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