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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
Aug 4, 2025 (view filing)Aug 13 daysXiao DemingEVP, Global OperationsSSale−40.0K$780.00−$31.2M−24.8%121.6K after10b5-1
Aug 13, 2025 (view filing)Aug 121 dayZhou JeffDirectorSSale−200$830.00−$166.0K−3.1%6.20K after
Aug 15, 2025 (view filing)Aug 132 daysZhou JeffDirectorSSale−400$850.00−$340.0K−6.4%5.80K after
Aug 18, 2025 (view filing)Aug 153 daysHsing MichaelCEOSSale−20.2K$829.10−$16.8M−2.4%814.7K after11 lots
Aug 28, 2025 (view filing)Aug 271 dayZhou JeffDirectorSSale−193$870.00−$167.9K−3.3%5.61K after
Sep 2, 2025 (view filing)Aug 294 daysElmiger Eugen JDirectorSSale−4.00K$846.71−$3.39M−18.9%17.2K after6 lots
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 23, 2025 (view filing)Sep 185 daysLateTseng SariaEVP & General CounselSSale−14.5K$914.45−$13.3M−9.1%144.5K after10b5-1
Sep 23, 2025 (view filing)Sep 185 daysLateMartinez CarintiaDirectorSSale−1.40K$900.00−$1.26M−61.5%878 after10b5-1
Oct 1, 2025 (view filing)Oct 1Same dayBlegen TheodoreEVP and CFOSSale−3.00K$913.22−$2.74M−7.3%37.9K after13 lots10b5-1
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 24, 2025 (view filing)Oct 24Same dayTseng SariaEVP & General CounselSSale−1.30K$1,087.62−$1.41M−1.0%126.4K after10b5-1
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
Nov 6, 2025 (view filing)Nov 51 daySciammas MauriceEVP, WW Sales & MarketingSSale−200$986.81−$197.4K−13.3%1.30K after
Nov 13, 2025 (view filing)Nov 112 daysHsing MichaelCEOSSale−40.0K$958.39−$38.3M−4.0%955.7K after17 lots
Nov 13, 2025 (view filing)Nov 121 dayHsing MichaelCEOSSale−37.0K$965.52−$35.7M−3.9%918.7K after19 lots
Nov 20, 2025 (view filing)Nov 191 daySciammas MauriceEVP, WW Sales & MarketingSSale−7.03K$870.21−$6.12M−3.8%176.3K after12 lots
Nov 20, 2025 (view filing)Nov 191 daySciammas MauriceEVP, WW Sales & MarketingSSale−28.0K$881.66−$24.7M−15.9%148.3K after12 lots
Nov 24, 2025 (view filing)Nov 213 daysChang Kuo Wei HerbertDirectorSSale−100$873.97−$87.4K−16.0%526 after
Nov 25, 2025 (view filing)Nov 241 daySciammas MauriceEVP, WW Sales & MarketingSSale−3.98K$895.23−$3.56M−2.7%144.3K after
Nov 25, 2025 (view filing)Nov 25Same dayChang Kuo Wei HerbertDirectorSSale−100$896.97−$89.7K−19.0%426 after
Nov 28, 2025 (view filing)Nov 253 daysTseng SariaEVP & General CounselSSale−20.0K$904.18−$18.1M−9.6%187.3K after19 lots
Nov 28, 2025 (view filing)Nov 262 daysTseng SariaEVP & General CounselSSale−20.0K$926.47−$18.5M−10.7%167.3K after9 lots
Dec 2, 2025 (view filing)Dec 11 dayBlegen TheodoreEVP and CFOSSale−3.00K$908.21−$2.72M−4.0%71.3K after10 lots10b5-1
Dec 29, 2025 (view filing)Dec 245 daysLee Victor KDirectorSSale−1.00K$951.72−$951.7K−3.4%28.6K after6 lots10b5-1
Jan 6, 2026 (view filing)Jan 24 daysBlegen TheodoreEVP and CFOSSale−3.00K$940.47−$2.82M−4.2%68.3K after15 lots10b5-1
Jan 6, 2026 (view filing)Jan 24 daysLee Victor KDirectorSSale−600$930.86−$558.5K−2.1%28.0K after10b5-1
Feb 4, 2026 (view filing)Feb 22 daysBlegen TheodoreEVP and CFOSSale−3.00K$1,129.76−$3.39M−4.4%65.3K after17 lots10b5-1
Feb 10, 2026 (view filing)Feb 64 daysHsing MichaelCEOSSale−54.9K$1,171.16−$64.3M−5.3%988.2K after
Feb 10, 2026 (view filing)Feb 64 daysBlegen TheodoreEVP and CFOSSale−21.7K$1,171.16−$25.4M−20.9%82.4K after
Feb 10, 2026 (view filing)Feb 64 daysSciammas MauriceEVP, WW Sales & MarketingSSale−22.9K$1,171.16−$26.8M−11.4%178.6K after
Feb 10, 2026 (view filing)Feb 64 daysTseng SariaEVP & General CounselSSale−22.9K$1,171.16−$26.8M−10.2%200.6K after
Feb 10, 2026 (view filing)Feb 64 daysXiao DemingEVP, Global OperationsSSale−22.9K$1,171.16−$26.8M−8.8%235.9K after
Feb 11, 2026 (view filing)Feb 92 daysLee Victor KDirectorSSale−400$1,212.16−$484.9K−1.4%27.8K after10b5-1
Feb 12, 2026 (view filing)Feb 102 daysHsing MichaelCEOSSale−34.0K$1,142.28−$38.8M−3.4%954.2K after9 lots10b5-1
Feb 12, 2026 (view filing)Feb 111 daySciammas MauriceEVP, WW Sales & MarketingSSale−200$1,179.98−$236.0K−13.3%1.30K after
Feb 13, 2026 (view filing)Feb 112 daysHsing MichaelCEOSSale−33.0K$1,188.92−$39.2M−3.5%921.2K after10 lots10b5-1
Feb 17, 2026 (view filing)Feb 125 daysHsing MichaelCEOSSale−33.0K$1,171.83−$38.7M−3.6%888.2K after12 lots10b5-1
Mar 24, 2026 (view filing)Mar 204 daysSciammas MauriceEVP, WW Sales & MarketingSSale−30$1,095.07−$32.9K−2.3%1.27K after10b5-1
Apr 1, 2026 (view filing)Mar 302 daysTseng SariaEVP & General CounselSSale−25.7K$1,010.50−$25.9M−12.8%175.0K after8 lots10b5-1
Apr 3, 2026 (view filing)Apr 12 daysSciammas MauriceEVP, WW Sales & MarketingSSale−30$1,116.44−$33.5K−2.4%1.24K after10b5-1
Apr 3, 2026 (view filing)Apr 12 daysTseng SariaEVP & General CounselSSale−1.40K$1,133.52−$1.59M−0.8%173.6K after5 lots10b5-1
Apr 8, 2026 (view filing)Apr 62 daysTseng SariaEVP & General CounselSSale−7.64K$1,167.95−$8.92M−4.4%165.9K after8 lots10b5-1
Apr 10, 2026 (view filing)Apr 82 daysTseng SariaEVP & General CounselSSale−8.96K$1,305.22−$11.7M−5.4%157.0K after10 lots10b5-1
May 6, 2026 (view filing)May 42 daysSciammas MauriceEVP, WW Sales & MarketingSSale−30$1,588.73−$47.7K−2.4%1.21K after10b5-1
May 6, 2026 (view filing)May 51 daySciammas MauriceEVP, WW Sales & MarketingSSale−380$1,583.81−$601.8K−29.3%919 after
May 6, 2026 (view filing)May 5-61 dayZhou JeffDirectorSSale−1.51K$1,607.85−$2.43M−26.1%4.29K after3 lots
May 8, 2026 (view filing)May 62 daysWynne EileenDirectorSSale−335$1,582.68−$530.2K−25.0%1.01K after
May 8, 2026 (view filing)May 62 daysXiao DemingEVP, Global OperationsSSale−30.0K$1,654.55−$49.6M−12.7%206.0K after4 lots
May 8, 2026 (view filing)May 62 daysElmiger Eugen JDirectorSSale−12.0K$1,584.96−$19.0M−69.0%5.40K after9 lots