Monolithic Power Systems (MPWR) Insider Trading & Ownership $632.97 +5.04 (+0.80%) Closing price 04:00 PM EasternExtended Trading$630.38 -2.60 (-0.41%) As of 05:55 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 OwnershipPercentage3.70%Number OfInsiders Buying(Last 12 Months)0Number OfInsiders Selling(Last 12 Months)8Amount OfInsider Selling(Last 12 Months)$137.05 M 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 Remove Ads 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 TransactionDetails2/7/2025Maurice 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 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 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. 8/8/2024Deming XiaoEVPSell859$778.39$668,637.01 8/8/2024Michael HsingCEOSell2,790$778.39$2,171,708.10 8/8/2024Theodore BlegenCFOSell728$778.39$566,667.92 8/1/2024Theodore BlegenCFOSell2,500$852.51$2,131,275.00 7/22/2024Deming XiaoEVPSell3,205$831.58$2,665,213.90 7/22/2024Michael HsingCEOSell9,614$831.58$7,994,810.12 7/22/2024Theodore BlegenCFOSell2,580$831.58$2,145,476.40 7/8/2024Maurice SciammasEVPSell10,999$843.83$9,281,286.17 7/1/2024Michael HsingCEOSell2,672$804.57$2,149,811.04 7/1/2024Saria TsengEVPSell37,093$808.20$29,978,562.60 7/1/2024Theodore BlegenCFOSell2,500$804.19$2,010,475.00 6/28/2024Victor K LeeDirectorSell1,000$820.46$820,460.00 6/3/2024Michael HsingCEOSell8,000$731.08$5,848,640.00 6/3/2024Theodore BlegenCFOSell2,416$731.43$1,767,134.88 5/22/2024Deming XiaoEVPSell1,300$769.40$1,000,220.00 5/20/2024Jeff ZhouDirectorSell200$750.00$150,000.00 5/15/2024Kuo Wei Herbert ChangDirectorSell200$735.00$147,000.00 5/8/2024Michael HsingCEOSell2,824$690.00$1,948,560.00 5/8/2024Saria TsengEVPSell869$690.02$599,627.38 5/8/2024Theodore BlegenCFOSell737$689.98$508,515.26 5/3/2024Tommy TubervilleU.S. Congress Member (R-AL)Sell$707.22$1,001 - $15,0005/1/2024Michael HsingCEOSell8,000$661.85$5,294,800.00 5/1/2024Theodore BlegenCFOSell2,500$663.29$1,658,225.00 4/8/2024Maurice SciammasEVPSell11,000$681.83$7,500,130.00 4/1/2024Michael HsingCEOSell8,000$677.44$5,419,520.00 (Data available from 1/1/2013 forward) MPWR Insider Trading Activity - Frequently Asked Questions Who is on Monolithic Power Systems's 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? 3.70% 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 ($39,054,535.84), James C Moyer ($2,047,972.00), Jeff Zhou ($300,114.00), Kuo Wei Herbert Chang ($812,085.00), Maurice Sciammas ($46,791,257.27), Michael Hsing ($122,398,351.33), Saria Tseng ($61,592,444.20), Theodore Blegen ($50,968,824.64), and Victor K Lee ($820,460.00). How much insider selling is happening at Monolithic Power Systems? Insiders have sold a total of 508,603 Monolithic Power Systems shares in the last 24 months for a total of $324,786,044.28 sold. Which members of congress are trading Monolithic Power Systems? Robert Bresnahan, Jr. (R-PA) and Tommy Tuberville (R-AL) have sold shares of Monolithic Power Systems in the last year 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: $1.23M2 recent tradesMs. Genevieve CunninghamSenior Manager of Marketing Communications More Insider Trading Tools from MarketBeat Related Companies MU Insider Trading INTC Insider Trading ADI Insider Trading MRVL Insider Trading MCHP Insider Trading FSLR Insider Trading SWKS Insider Trading ALTR Insider Trading LSCC Insider Trading MTSI 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 NVIDIA Insiders Sell: This Is What It Means for the Market Top 3 Insider Stock Buys in March—Are They Still Good in April?Grocery Outlet Insider and Institutional Buyers Signal BottomSentinelOne Insider Selling? Why Investors Should Stay Bullish 3 Companies Buying Back Stock—Why It Matters This page (NASDAQ:MPWR) was last updated on 3/25/2025 by MarketBeat.com Staff From Our PartnersYour Wealth is Under AttackPlease don't wait—this is your moment to take action. Download your Wealth Protection Guide now, claim your fr...American Alternative | SponsoredA brutally honest economic warning for 2025 (see proof)New York Times best-selling financial author and world-renowned economist Addison Wiggin (a man who’s worked s...Banyan Hill Publishing | Sponsored$2 Trillion Disappears Because of Fed's Secretive New Move$2 trillion has disappeared from the US government's books. The reason why is a new, secretive move being c...Stansberry Research | SponsoredHas Trump finally met his match?Dylan Jovine predicted the 2008 crash over a year before it happened. 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