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Monolithic Power Systems, Inc.

MPWR
Exchange
Nasdaq
Industry
Semiconductors & Related Devices
SEC CIK
0001280452

In the last 90 days, Monolithic Power Systems, Inc. insiders filed 0 open-market purchases and 8 sales; 1,250 institutions reported holding it in 13F filings for Q2 2026, worth $65.6B in total; superinvestors D1 Capital Partners and Maverick Capital hold it.

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by Monolithic Power Systems, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
0 filings
Open-market sells
8 filings
3 insiders, $20.7M in total
Insiders trading
3
Net value
−$20.7M
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for Monolithic Power Systems, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for Monolithic Power Systems, Inc.
NameTitleLast reported holdingLast filingFilings, past year
Tseng SariaEVP & General Counsel2,000IndirectSep 2, 202616
Dean Robert W IIInterim CFO7,089Aug 26, 20267
Chang Kuo Wei HerbertDirector515Aug 25, 20265
Sciammas MauriceEVP, WW Sales & Marketing36,062IndirectAug 6, 202622
Zhou JeffDirector3,800May 27, 20263
Hsing MichaelCEO848,263May 20, 202611
Xiao DemingEVP, Global Operations205,959May 8, 20265
Elmiger Eugen JDirector5,402May 8, 20262
Wynne EileenDirector1,007May 8, 20262
Lee Victor KDirector27,756Feb 11, 20264
Blegen TheodoreEVP and CFO82,353Feb 10, 20269
Martinez CarintiaDirector1,067Feb 5, 20261
Moyer James CDirector0IndirectAug 29, 20240

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Nov 13, 2025 (view filing)Nov 121 dayHsing MichaelCEOSSale−37.0K$965.52−$35.7M−3.9%918.7K after19 lots
Nov 13, 2025 (view filing)Nov 112 daysHsing MichaelCEOSSale−40.0K$958.39−$38.3M−4.0%955.7K after17 lots
Nov 6, 2025 (view filing)Nov 51 daySciammas MauriceEVP, WW Sales & MarketingSSale−200$986.81−$197.4K−13.3%1.30K after
Nov 4, 2025 (view filing)Nov 31 dayBlegen TheodoreEVP and CFOSSale−3.00K$1,024.43−$3.07M−3.9%74.3K after22 lots10b5-1
Oct 24, 2025 (view filing)Oct 24Same dayTseng SariaEVP & General CounselSSale−1.30K$1,087.62−$1.41M−1.0%126.4K after10b5-1
Oct 17, 2025 (view filing)Oct 15-162 daysTseng SariaEVP & General CounselSSale−16.8K$1,017.77−$17.1M−11.7%127.7K after3 lots10b5-1
Oct 1, 2025 (view filing)Oct 1Same dayBlegen TheodoreEVP and CFOSSale−3.00K$913.22−$2.74M−7.3%37.9K after13 lots10b5-1
Sep 23, 2025 (view filing)Sep 185 daysLateMartinez CarintiaDirectorSSale−1.40K$900.00−$1.26M−61.5%878 after10b5-1
Sep 23, 2025 (view filing)Sep 185 daysLateTseng SariaEVP & General CounselSSale−14.5K$914.45−$13.3M−9.1%144.5K after10b5-1
Sep 3, 2025 (view filing)Sep 21 dayBlegen TheodoreEVP and CFOSSale−3.00K$814.34−$2.44M−6.8%40.9K after14 lots10b5-1
Sep 2, 2025 (view filing)Aug 294 daysElmiger Eugen JDirectorSSale−4.00K$846.71−$3.39M−18.9%17.2K after6 lots
Aug 28, 2025 (view filing)Aug 271 dayZhou JeffDirectorSSale−193$870.00−$167.9K−3.3%5.61K after
Aug 18, 2025 (view filing)Aug 153 daysHsing MichaelCEOSSale−20.2K$829.10−$16.8M−2.4%814.7K after11 lots
Aug 15, 2025 (view filing)Aug 132 daysZhou JeffDirectorSSale−400$850.00−$340.0K−6.4%5.80K after
Aug 13, 2025 (view filing)Aug 121 dayZhou JeffDirectorSSale−200$830.00−$166.0K−3.1%6.20K after
Aug 4, 2025 (view filing)Aug 13 daysXiao DemingEVP, Global OperationsSSale−40.0K$780.00−$31.2M−24.8%121.6K after10b5-1
Aug 4, 2025 (view filing)Aug 13 daysBlegen TheodoreEVP and CFOSSale−3.00K$750.00−$2.25M−6.4%43.9K after10b5-1
Jul 2, 2025 (view filing)Jul 11 dayBlegen TheodoreEVP and CFOSSale−6.00K$750.00−$4.50M−11.3%46.9K after10b5-1
May 13, 2025 (view filing)May 13Same dayChang Kuo Wei HerbertDirectorSSale−50$738.00−$36.9K−7.4%626 after
May 12, 2025 (view filing)May 12Same dayChang Kuo Wei HerbertDirectorSSale−100$698.00−$69.8K−12.9%676 after
May 12, 2025 (view filing)May 12Same daySciammas MauriceEVP, WW Sales & MarketingSSale−12.0K$701.00−$8.41M−74.9%4.01K after10b5-1
May 9, 2025 (view filing)May 81 dayChang Kuo Wei HerbertDirectorSSale−100$650.00−$65.0K−11.4%776 after
Feb 20, 2025 (view filing)Feb 182 daysHsing MichaelCEOSSale−5.20K$700.00−$3.64M−0.6%834.9K after10b5-1
Feb 12, 2025 (view filing)Feb 102 daysXiao DemingEVP, Global OperationsSSale−662$717.10−$474.7K−0.4%161.6K after
Feb 12, 2025 (view filing)Feb 102 daysTseng SariaEVP & General CounselSSale−663$717.10−$475.4K−0.4%159.0K after
Feb 12, 2025 (view filing)Feb 102 daysSciammas MauriceEVP, WW Sales & MarketingSSale−662$717.10−$474.7K−0.6%102.3K after
Feb 12, 2025 (view filing)Feb 102 daysHsing MichaelCEOSSale−2.59K$717.10−$1.86M−0.3%840.1K after
Feb 12, 2025 (view filing)Feb 102 daysBlegen TheodoreEVP and CFOSSale−532$717.10−$381.5K−1.0%52.9K after
Feb 11, 2025 (view filing)Feb 74 daysHsing MichaelCEOSSale−12.0K$700.00−$8.37M−1.4%842.7K after10b5-1
Feb 11, 2025 (view filing)Feb 74 daysSciammas MauriceEVP, WW Sales & MarketingSSale−7.00K$701.98−$4.91M−30.4%16.0K after4 lots10b5-1
Jan 28, 2025 (view filing)Jan 244 daysHsing MichaelCEOSSale−3.64K$700.00−$2.55M−0.4%854.6K after10b5-1
Dec 11, 2024 (view filing)Dec 92 daysBlegen TheodoreEVP and CFOSSale−2.50K$600.00−$1.50M−4.5%53.4K after10b5-1
Nov 13, 2024 (view filing)Nov 85 daysXiao DemingEVP, Global OperationsSSale−866$765.14−$662.6K−0.5%162.2K after
Nov 13, 2024 (view filing)Nov 85 daysTseng SariaEVP & General CounselSSale−866$765.14−$662.6K−0.5%159.6K after
Nov 13, 2024 (view filing)Nov 85 daysSciammas MauriceEVP, WW Sales & MarketingSSale−866$765.14−$662.6K−0.8%103.0K after
Nov 13, 2024 (view filing)Nov 85 daysBlegen TheodoreEVP and CFOSSale−734$765.15−$561.6K−1.3%55.9K after
Nov 13, 2024 (view filing)Nov 85 daysHsing MichaelCEOSSale−2.81K$765.15−$2.15M−0.3%858.3K after
Nov 5, 2024 (view filing)Nov 14 daysBlegen TheodoreEVP and CFOSSale−2.50K$772.96−$1.93M−4.2%56.7K after13 lots10b5-1
Oct 8, 2024 (view filing)Oct 71 daySciammas MauriceEVP, WW Sales & MarketingSSale−11.0K$929.59−$10.2M−9.6%103.8K after11 lots10b5-1
Oct 2, 2024 (view filing)Oct 11 dayBlegen TheodoreEVP and CFOSSale−2.50K$908.36−$2.27M−4.1%59.2K after19 lots10b5-1
Sep 3, 2024 (view filing)Sep 3Same dayBlegen TheodoreEVP and CFOSSale−2.50K$904.20−$2.26M−3.9%61.7K after21 lots10b5-1
Aug 29, 2024 (view filing)Aug 272 daysXiao DemingEVP, Global OperationsSSale−9.26K$950.00−$8.80M−31.2%20.5K after
Aug 22, 2024 (view filing)Aug 22Same dayXiao DemingEVP, Global OperationsSSale−10.0K$950.00−$9.50M−25.2%29.7K after
Aug 15, 2024 (view filing)Aug 15Same dayChang Kuo Wei HerbertDirectorSSale−200$893.44−$178.7K−27.0%541 after2 lots
Aug 13, 2024 (view filing)Aug 9-164 daysHsing MichaelCEOSSale−4.26K$827.18−$3.53M−0.5%861.1K after18 lots10b5-1
Aug 12, 2024 (view filing)Aug 84 daysXiao DemingEVP, Global OperationsSSale−859$778.39−$668.6K−0.4%202.4K after
Aug 12, 2024 (view filing)Aug 84 daysTseng SariaEVP & General CounselSSale−859$778.39−$668.6K−0.5%160.5K after
Aug 12, 2024 (view filing)Aug 84 daysSciammas MauriceEVP, WW Sales & MarketingSSale−859$778.39−$668.6K−0.7%114.8K after
Aug 12, 2024 (view filing)Aug 84 daysBlegen TheodoreEVP and CFOSSale−728$778.39−$566.7K−1.1%64.2K after
Aug 12, 2024 (view filing)Aug 84 daysHsing MichaelCEOSSale−2.79K$778.39−$2.17M−0.3%865.3K after