WallStreetZenWallStreetZen

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. PetersenDirector2025-08-01500$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
Rong ZhouSENIOR EVP PRODUCTION CENTER2025-03-171,967$27.69
$54.47kSell
Yakob LiawatidewiEVP CORP ADMIN CENTER2025-03-171,731$27.69
$47.93kSell

1 of 6

AMPH insiders have bought more... subscribe to Premium to read more.
Net Insider Buy/Sell (L12M) Ownership

Be the first to know when AMPH insiders and whales buy or sell their stock.

AMPH Shareholders

What type of owners hold Amphastar Pharmaceuticals Inc stock?

Institutional
Insider
Retail
NameHoldSharesValueType
Jack Y. Zhang37.15%17,511,932$531.31MInsider
Mary Z. Luo18.97%8,941,010$271.27MInsider
Applied Physics Chemistry Laboratories Inc15.54%7,327,679$222.32MInsider
Blackrock Inc12.03%5,668,793$171.99MInstitution
Vanguard Group Inc5.70%2,686,950$81.52MInstitution
Td Asset Management Inc4.32%2,034,930$61.74MInstitution
Dimensional Fund Advisors LP3.45%1,626,884$49.36MInstitution
State Street Corp3.34%1,576,233$47.82MInstitution
Fuller Thaler Asset Management Inc2.68%1,263,772$38.34MInstitution
Epoch Investment Partners Inc2.63%1,241,369$37.66MInstitution

1 of 3

AMPH vs Pharmaceutical Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
AMPH48.23%51.77%Net BuyingNet Buying
HROW28.62%71.38%Net SellingNet Buying
AVDL83.75%13.63%Net Buying
TLRY9.31%1.87%Net BuyingNet Buying
PAHC44.40%55.60%Net Buying
View Top Pharmaceutical Stocks

Amphastar Pharmaceuticals Stock Ownership FAQ

Who owns Amphastar Pharmaceuticals?

Amphastar Pharmaceuticals (NASDAQ: AMPH) is owned by 69.32% 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 $533.94M.

If you're new to stock investing, here's how to buy Amphastar Pharmaceuticals stock.
©2025 WallStreetZen
Company
AboutNewsBlogStock Investing FAQPlansPrivacy PolicyTerms of ServiceCancellation & RefundsPerformanceHelp GuidesContactTwitterYouTubeNewsletter
Stock Tools
Top Performing AnalystsStock ScreenerStock ForecastTrending StocksStrong Buy StocksHighest Earnings StocksBest Dividend Paying StocksStatisticsStock Market SectorsStock Market IndustriesHow to Buy Stocks Online
Stock Ideas
Buy The DipBiggest Stock Gainers TodayBiggest Stock Losers Today52 Week High Stocks52 Week Low StocksMost Active Stocks TodayMost Undervalued StocksBest Penny Stocks to Buy NowBest Stocks Under $5Best Stocks Under $10
WallStreetZen does not provide financial advice and does not issue recommendations or offers to buy stock or sell any security.

Information is provided 'as-is' and solely for informational purposes and is not advice. WallStreetZen does not bear any responsibility for any losses or damage that may occur as a result of reliance on this data.