Amprius Technologies (AMPX) Insider Trading & Ownership $2.69 -0.14 (-4.95%) Closing price 03:59 PM EasternExtended Trading$2.70 +0.01 (+0.37%) As of 07:56 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 InterestTrendsBuy This Stock Amprius Technologies (NYSE:AMPX) Insider Buying and Selling ActivityCurrentInsider OwnershipPercentage12.90%Number OfInsiders Buying(Last 12 Months)0Number OfInsiders Selling(Last 12 Months)6Amount OfInsider Selling(Last 12 Months)$1.69 M Get AMPX Insider Trade Alerts Want to know when executives and insiders are buying or selling Amprius Technologies stock? 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Email Address AMPX Insider Buying and Selling by Quarter Amprius Technologies 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 TransactionDetails5/21/2025Constantin Ionel StefanCTOSell20,366$2.43$49,489.38 5/21/2025Kang SunCEOSell69,786$2.43$169,579.98 5/21/2025Sandra WallachCFOSell27,595$2.43$67,055.85 2/21/2025Constantin Ionel StefanCTOSell9,066$3.13$28,376.58 2/21/2025Jonathan BornsteinInsiderSell13,527$3.13$42,339.51 2/21/2025Kang SunCEOSell34,353$3.13$107,524.89 2/21/2025Sandra WallachCFOSell18,142$3.13$56,784.46 11/21/2024Constantin Ionel StefanCTOSell8,575$1.96$16,807.00 11/21/2024Jonathan BornsteinInsiderSell18,170$1.96$35,613.20 11/21/2024Sandra WallachCFOSell17,158$1.96$33,629.68 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. 9/5/2024Justin E MirroDirectorSell250,000$0.81$202,500.00 9/3/2024Amprius, Inc.Major ShareholderSell6,300$1.00$6,300.00 9/3/2024Justin E MirroDirectorSell135,000$1.00$135,000.00 8/21/2024Constantin Ionel StefanCTOSell8,800$1.04$9,152.00 8/21/2024Jonathan BornsteinInsiderSell18,644$1.04$19,389.76 8/21/2024Kang SunCEOSell33,333$1.04$34,666.32 8/21/2024Sandra WallachCFOSell17,606$1.04$18,310.24 6/14/2024Justin E MirroDirectorSell260,000$1.13$293,800.00 6/12/2024Justin E MirroDirectorSell280,000$1.30$364,000.00 (Data available from 1/1/2013 forward) AMPX Insider Trading Activity - Frequently Asked Questions Who is on Amprius Technologies's Insider Roster? The list of insiders at Amprius Technologies includes Amprius, Inc., Constantin Ionel Stefan, Jonathan Bornstein, Justin E Mirro, Kang Sun, and Sandra Wallach. Learn more on insiders at AMPX. What percentage of Amprius Technologies stock is owned by insiders? 12.90% of Amprius Technologies stock is owned by insiders. Learn more on AMPX's insider holdings. Which Amprius Technologies insiders have been selling company stock? The following insiders have sold AMPX shares in the last 24 months: Amprius, Inc. ($722,300.00), Constantin Ionel Stefan ($280,550.92), Jonathan Bornstein ($3,353,366.91), Justin E Mirro ($3,208,200.00), Kang Sun ($338,335.28), and Sandra Wallach ($189,810.40). How much insider selling is happening at Amprius Technologies? Insiders have sold a total of 2,857,784 Amprius Technologies shares in the last 24 months for a total of $8,092,563.51 sold. Amprius Technologies Key ExecutivesDr. Kang Sun Ph.D. (Age 69)President, CEO & Director Compensation: $1.25MMs. Sandra Wallach (Age 59)CFO & Secretary Compensation: $616.06k2 recent tradesMr. Jonathan Bornstein (Age 65)President of Amprius Lab Compensation: $716.13k1 recent tradesMr. Aaron BakkeVice President of OperationsDr. Constantin Ionel Stefan (Age 51)Chief Technology Officer Compensation: $299.7k2 recent tradesMs. Siyu JiangVice President of Legal AffairsMr. Scott ZafiropouloSenior Director of Marketing More Insider Trading Tools from MarketBeat Related Companies FLNC Insider Trades PLUG Insider Trades BYRN Insider Trades SES Insider Trades NPWR Insider Trades SLDP Insider Trades EAF Insider Trades FREY Insider Trades NRGV Insider Trades SKYX Insider Trades 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 Dividend Investors Looking for an Edge? 3 Stocks Insiders BoughtMeta's Institutional & Insider Data Fuels Bulls Despite DisparityTurbulence for Joby Shares: What's Behind the Recent Dip?UnitedHealth Insiders Double Down: Is UNH Stock a Value Play?Sprouts Stock: Insider Sales, But Strong Bullish Signals This page (NYSE:AMPX) was last updated on 5/30/2025 by MarketBeat.com Staff From Our PartnersTrump Makes Major Crypto AnnouncementPay close attention to what I'm about to share… Most investors think Trump's pro-crypto policies will lift ...Crypto 101 Media | SponsoredTrump Exec Order 14179 is wealth “gift” to good Americans?Is President Trump’s Executive Order 14179… A secret way to restore wealth for good citizens? 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