Amphastar Pharmaceuticals (AMPH) Insider Trading & Ownership $21.27 +0.09 (+0.42%) Closing price 07/16/2025 04:00 PM EasternExtended Trading$21.64 +0.37 (+1.72%) As of 07/16/2025 07:14 PM Eastern Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more. Add Compare Share Share Insider Trades Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Amphastar Pharmaceuticals (NASDAQ:AMPH) Insider Buying and Selling ActivityCurrentInsider OwnershipPercentage27.50%Number OfInsiders Buying(Last 12 Months)0Number OfInsiders Selling(Last 12 Months)5Amount OfInsider Selling(Last 12 Months)$3.68M Get AMPH Insider Trade Alerts Want to know when executives and insiders are buying or selling Amphastar Pharmaceuticals stock? 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Email Address AMPH Insider Buying and Selling by Quarter Amphastar Pharmaceuticals Insider and Congressional Trades History Insiders and Members of Congress Insiders Only Members of Congress Only Transaction Type Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year 2 Years 3 Years Time Frame Start Date End Date Export to Excel Transaction DateNameTitleBuy/SellNumber of SharesAverage Share PriceTotal TransactionDetails7/2/2025Floyd F PetersenDirectorSell500$23.47$11,735.00 6/2/2025Floyd F PetersenDirectorSell500$25.67$12,835.00 5/1/2025Floyd F PetersenDirectorSell500$24.08$12,040.00 4/1/2025Floyd F PetersenDirectorSell500$28.38$14,190.00 3/4/2025William J PetersCFOSell4,231$27.54$116,521.74 12/12/2024Rong ZhouEVPSell7,000$44.42$310,940.00 12/9/2024Richard K PrinsDirectorSell10,000$43.77$437,700.00 11/12/2024Richard K PrinsDirectorSell5,000$48.80$244,000.00 11/12/2024Rong ZhouEVPSell6,893$48.88$336,929.84 11/6/2024William J PetersCFOSell7,426$52.05$386,523.30 Get Insider Trades Delivered To Your InboxEnter your email address below to receive a concise daily summary of insider buying activity, insider selling activity and changes in hedge fund holdings. 11/6/2024Yakob LiawatidewiEVPSell5,214$52.05$271,388.70 9/5/2024Floyd F PetersenDirectorSell3,000$46.47$139,410.00 8/26/2024Rong ZhouEVPSell4,000$48.35$193,400.00 8/12/2024Richard K PrinsDirectorSell17,101$43.07$736,540.07 7/31/2024William J PetersCFOSell10,282$44.23$454,772.86 (Data available from 1/1/2013 forward) AMPH Insider Trading Activity - Frequently Asked Questions Who is on Amphastar Pharmaceuticals' Insider Roster? The list of insiders at Amphastar Pharmaceuticals includes Diane G Gerst, Floyd F Petersen, Howard Lee, Mary Z Luo, Michael A Zasloff, Richard K Prins, Rong Zhou, William J Peters, and Yakob Liawatidewi. Learn more on insiders at AMPH. What percentage of Amphastar Pharmaceuticals stock is owned by insiders? 27.50% of Amphastar Pharmaceuticals stock is owned by insiders. Learn more on AMPH's insider holdings. Which Amphastar Pharmaceuticals insiders have been selling company stock? The following insiders have sold AMPH shares in the last 24 months: Floyd F Petersen ($532,855.00), Mary Z Luo ($15,048,002.66), Michael A Zasloff ($1,319,819.98), Richard K Prins ($2,009,180.07), Rong Zhou ($1,303,465.24), William J Peters ($4,248,452.43), and Yakob Liawatidewi ($1,802,382.78). How much insider selling is happening at Amphastar Pharmaceuticals? Insiders have sold a total of 491,921 Amphastar Pharmaceuticals shares in the last 24 months for a total of $26,264,158.16 sold. Amphastar Pharmaceuticals Key ExecutivesDr. Ziping Luo Ph.D. (Age 74)Chairman of the Board, Chief Scientist & COO Compensation: $1.36MDr. Yongfeng Zhang Ph.D. (Age 77)Co-Founder, President, CEO, Chief Scientific Officer & Director Compensation: $2MMr. William J. Peters M.B.A. (Age 56)CFO, Executive VP of Finance, Treasurer & Director Compensation: $1.21M1 recent tradesMr. Jacob Liawatidewi M.B.A. (Age 50)Executive VP of Sales, Marketing & Corporate Administration Center, Corporate Secretary and Director Compensation: $880.1kMr. Rong Zhou M.S. (Age 65)Senior EVP of Production & EVP of Scientific Affairs Compensation: $962.3kMr. Dan Dischner M.B.A.Senior Vice President of Human Resources & Corporate CommunicationTony Marrs M.B.A.M.P.H., M.S., Executive VP of Regulatory Affairs & Clinical Operations More Insider Trading Tools from MarketBeat Related Companies ADMA Biologics Insider Ownership Vaxcyte Insider Ownership Rhythm Pharmaceuticals Insider Ownership Cytokinetics Insider Ownership Krystal Biotech Insider Ownership Akero Therapeutics Insider Ownership Zai Lab Insider Ownership PTC Therapeutics Insider Ownership Ultragenyx Pharmaceutical Insider Ownership Merus Insider Ownership Insider Tracking Tools CEO Purchases/Sales CFO Purchases/Sales Top Insider Buying Stocks Top Insider Selling Stocks Insider Trades Screener Insider Trades Newsletter Congressional Stock Trades Insider Trading By Country U.S. Insider Trading Activity Canadian Insider Trading Activity U.K. Insider Trading Activity Australia Insider Trading Activity Latest Articles Insider Selling Hits Market Leaders—Should You Be Worried?3 Small Caps Drawing Insider and Institutional SupportDo They Know Something? Insiders & Congress Buy UnitedHealthMicron Insiders Sell But Investors Should Buy, Buy, BuySizzling Insider Buys for Your High-Yield Watchlist This page (NASDAQ:AMPH) was last updated on 7/17/2025 by MarketBeat.com Staff From Our PartnersINVESTOR ALERT: Tiny “$3 AI Wonder Stock” on the Verge of Blasting OffRight now, we’re witnessing a monumental shift in the world.Traders Agency | SponsoredMarket Panic: Trump Just Dropped a Bomb on Your Stockstock Market Panic: Trump Just Dropped a Bomb on Your Stocks The market is in freefall—and Trump's new tarif...American Alternative | SponsoredThis Signal Only Flashes Once Every 4 Years – And It Just TriggeredThis same signal has appeared twice before in the past 8 years — both times, it kicked off major moves in cryp...Crypto Swap Profits | SponsoredPresidential Bombshell: $150T Resource to Be Released as soon as this Summer?Something extraordinary is happening in Washington. 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