Monolithic Power Systems (MPWR) Insider Trading & Ownership $804.29 +6.35 (+0.80%) Closing price 08/8/2025 04:00 PM EasternExtended Trading$805.32 +1.03 (+0.13%) As of 08/8/2025 07:57 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 ForecastsChartCompetitorsDividendEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Monolithic Power Systems (NASDAQ:MPWR) Insider Buying and Selling ActivityCurrentInsider OwnershipPercentage3.40%Number OfInsiders Buying(Last 12 Months)0Number OfInsiders Selling(Last 12 Months)4Amount OfInsider Selling(Last 12 Months)$89.12M Get MPWR Insider Trade Alerts Want to know when executives and insiders are buying or selling Monolithic Power Systems stock? 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Email Address MPWR Insider Buying and Selling by Quarter Monolithic Power Systems 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 TransactionDetails8/1/2025Deming XiaoEVPSell39,999$780.00$31,199,220.00 8/1/2025Theodore BlegenCFOSell3,000$750.00$2,250,000.00 7/1/2025Theodore BlegenCFOSell6,000$750.00$4,500,000.00 5/12/2025Kuo Wei Herbert ChangDirectorSell100$698.00$69,800.00 5/12/2025Maurice SciammasEVPSell12,000$701.00$8,412,000.00 5/8/2025Kuo Wei Herbert ChangDirectorSell100$650.00$65,000.00 4/23/2025Ro KhannaU.S. Congress Member (D-CA)Sell$536.97$1,001 - $15,0004/8/2025Robert Bresnahan, Jr.U.S. Congress Member (R-PA)Buy$455.19$1,001 - $15,0002/7/2025Maurice SciammasEVPSell7,000$701.98$4,913,860.00 1/13/2025Robert Bresnahan, Jr.U.S. Congress Member (R-PA)Sell$587.35$1,001 - $15,00012/9/2024Theodore BlegenCFOSell2,500$600.00$1,500,000.00 11/8/2024Deming XiaoEVPSell866$765.14$662,611.24 11/8/2024Theodore BlegenCFOSell734$765.15$561,620.10 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. 11/1/2024Theodore BlegenCFOSell2,500$772.96$1,932,400.00 10/7/2024Maurice SciammasEVPSell11,000$929.59$10,225,490.00 10/1/2024Theodore BlegenCFOSell2,500$908.36$2,270,900.00 9/3/2024Theodore BlegenCFOSell2,500$904.20$2,260,500.00 8/27/2024Deming XiaoEVPSell9,259$950.00$8,796,050.00 8/22/2024Deming XiaoEVPSell10,000$950.00$9,500,000.00 (Data available from 1/1/2013 forward) MPWR Insider Trading Activity - Frequently Asked Questions Who is on Monolithic Power Systems' Insider Roster? The list of insiders at Monolithic Power Systems includes Deming Xiao, James C Moyer, Jeff Zhou, Kuo Wei Herbert Chang, Maurice Sciammas, Michael Hsing, Saria Tseng, Theodore Blegen, and Victor K Lee. Learn more on insiders at MPWR. What percentage of Monolithic Power Systems stock is owned by insiders? 3.40% of Monolithic Power Systems stock is owned by insiders. Learn more on MPWR's insider holdings. Which Monolithic Power Systems insiders have been selling company stock? The following insiders have sold MPWR shares in the last 24 months: Deming Xiao ($62,346,484.84), James C Moyer ($2,047,972.00), Jeff Zhou ($300,114.00), Kuo Wei Herbert Chang ($946,885.00), Maurice Sciammas ($49,130,202.68), Michael Hsing ($85,812,585.72), Saria Tseng ($57,339,795.94), Theodore Blegen ($50,282,121.80), and Victor K Lee ($820,460.00). How much insider selling is happening at Monolithic Power Systems? Insiders have sold a total of 448,367 Monolithic Power Systems shares in the last 24 months for a total of $309,026,621.98 sold. Which members of congress are trading Monolithic Power Systems? Robert Bresnahan, Jr. (R-PA) has bought shares of Monolithic Power Systems in the last year totaling $8,000. Ro Khanna (D-CA) and Robert Bresnahan, Jr. (R-PA) have sold shares totaling $16,000. Monolithic Power Systems Key ExecutivesMr. Michael R. Hsing (Age 64)Founder, Chairman, President & CEO Compensation: $2.33MMr. Theodore Bernie Blegen (Age 66)Executive VP & CFO Compensation: $1.13MMr. Deming Xiao (Age 61)Executive Vice President of Global Operations Compensation: $1.23M1 recent tradesMs. Saria Tseng (Age 53)EVP of Strategic Corporate Development, General Counsel & Corporate Secretary Compensation: $1.23MMr. Maurice Sciammas (Age 64)Executive Vice President of Worldwide Sales & Marketing Compensation: $1.23M1 recent tradesMs. Genevieve CunninghamSenior Manager of Marketing Communications More Insider Trading Tools from MarketBeat Related Companies AMAT Insider Trading GOOGL Insider Trading KLAC Insider Trading LRCX Insider Trading MKSI Insider Trading MXL Insider Trading NVDA Insider Trading NXPI Insider Trading ON Insider Trading ANET Insider Trading 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 Strategy Insiders Buy In While Analysts Predict Big UpsideThe Bottom Is in For These 3 Small-Cap Stocks Insiders Are Buying3 Catalysts Driving Plug Power’s Turnaround CaseInsider Selling Hits Market Leaders—Should You Be Worried?Insiders Spent Millions on These 3 Stocks Over the Past 2 Months This page (NASDAQ:MPWR) was last updated on 8/10/2025 by MarketBeat.com Staff From Our PartnersTrump’s national nightmare is herePorter Stansberry and Jeff Brown say a new U.S. national emergency is already underway — and it could trigger ...Porter & Company | SponsoredNational 'Stock Market Reset' Coming September 30 (New WH Order)Crash Coming Sept 30? 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