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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
Apr 6, 2023 (view filing)Apr 33 daysLateHsing MichaelCEOSSale−11.1K$487.99−$5.42M−1.0%1.05M after
Apr 6, 2023 (view filing)Apr 33 daysLateBlegen TheodoreCFOSSale−920$487.99−$449.0K−0.7%131.1K after
Apr 6, 2023 (view filing)Apr 33 daysLateSciammas MauriceSr. V.P.of Sales and MarketingSSale−4.36K$487.99−$2.13M−2.1%201.0K after
Apr 6, 2023 (view filing)Apr 33 daysLateXiao DemingPres. of MPS Asia OperationsSSale−4.36K$487.99−$2.13M−1.6%269.2K after
Apr 6, 2023 (view filing)Apr 33 daysLateTseng SariaVP & General CounselSSale−4.36K$487.99−$2.13M−1.6%270.0K after
May 4, 2023 (view filing)May 31 dayHsing MichaelCEOSSale−11.2K$463.55−$5.21M−1.0%1.07M after
May 4, 2023 (view filing)May 31 dayXiao DemingPres. of MPS Asia OperationsSSale−3.46K$463.55−$1.60M−1.2%274.4K after
May 4, 2023 (view filing)May 31 dayBlegen TheodoreCFOSSale−2.87K$463.55−$1.33M−2.1%134.0K after
May 4, 2023 (view filing)May 31 daySciammas MauriceSr. V.P.of Sales and MarketingSSale−3.46K$463.55−$1.60M−1.7%206.2K after
May 4, 2023 (view filing)May 31 dayTseng SariaVP & General CounselSSale−3.46K$463.55−$1.60M−1.2%275.3K after
May 5, 2023 (view filing)May 41 daySciammas MauriceSr. V.P.of Sales and MarketingSSalecommon−991$459.60−$455.5K−0.5%205.2K after
May 5, 2023 (view filing)May 41 dayXiao DemingPres. of MPS Asia OperationsSSale−991$459.60−$455.5K−0.4%273.4K after
May 5, 2023 (view filing)May 41 dayTseng SariaVP & General CounselSSale−991$459.60−$455.5K−0.4%274.3K after
May 5, 2023 (view filing)May 41 dayHsing MichaelCEOSSale−3.83K$459.60−$1.76M−0.4%1.06M after
May 5, 2023 (view filing)May 41 dayBlegen TheodoreCFOSSale−854$459.60−$392.5K−0.6%133.1K after
May 10, 2023 (view filing)May 91 dayTseng SariaVP & General CounselSSale−857$409.81−$351.2K−0.3%273.4K after
May 10, 2023 (view filing)May 91 dayHsing MichaelCEOSSale−2.79K$409.78−$1.14M−0.3%1.06M after
May 10, 2023 (view filing)May 91 dayBlegen TheodoreCFOSSale−711$409.78−$291.4K−0.5%132.4K after
May 10, 2023 (view filing)May 91 dayXiao DemingPres. of MPS Asia OperationsSSale−857$409.79−$351.2K−0.3%272.6K after
May 10, 2023 (view filing)May 91 daySciammas MauriceSr. V.P.of Sales and MarketingSSale−857$409.78−$351.2K−0.4%204.3K after
Jul 5, 2023 (view filing)Jul 32 daysBlegen TheodoreCFOSSale−905$537.79−$486.7K−0.7%131.5K after
Jul 5, 2023 (view filing)Jul 32 daysHsing MichaelCEOSSale−11.0K$537.79−$5.89M−1.0%1.05M after
Jul 5, 2023 (view filing)Jul 32 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−4.30K$537.79−$2.32M−2.1%200.0K after
Jul 5, 2023 (view filing)Jul 32 daysTseng SariaVP & General CounselSSale−4.30K$537.79−$2.32M−1.6%269.1K after
Jul 5, 2023 (view filing)Jul 32 daysXiao DemingPres. of MPS Asia OperationsSSale−4.30K$537.79−$2.32M−1.6%268.2K after
Jul 25, 2023 (view filing)Jul 214 daysXiao DemingPres. of MPS Asia OperationsSSale−9.62K$534.23−$5.14M−3.6%258.6K after
Jul 25, 2023 (view filing)Jul 214 daysTseng SariaVP & General CounselSSale−9.62K$534.23−$5.14M−3.6%259.5K after
Jul 25, 2023 (view filing)Jul 214 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−9.84K$534.23−$5.26M−4.9%190.2K after
Jul 25, 2023 (view filing)Jul 214 daysBlegen TheodoreCFOSSale−7.58K$534.23−$4.05M−5.8%123.9K after
Jul 25, 2023 (view filing)Jul 214 daysHsing MichaelCEOSSale−28.8K$534.23−$15.4M−2.7%1.02M after
Aug 7, 2023 (view filing)Aug 43 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−988$526.52−$520.2K−0.5%189.2K after
Aug 7, 2023 (view filing)Aug 43 daysXiao DemingPres. of MPS Asia OperationsSSale−988$526.53−$520.2K−0.4%257.6K after
Aug 7, 2023 (view filing)Aug 43 daysTseng SariaVP & General CounselSSale−988$526.52−$520.2K−0.4%258.5K after
Aug 7, 2023 (view filing)Aug 43 daysHsing MichaelCEOSSale−3.81K$526.54−$2.01M−0.4%1.02M after
Aug 7, 2023 (view filing)Aug 43 daysBlegen TheodoreCFOSSale−852$526.52−$448.6K−0.7%123.1K after
Aug 10, 2023 (view filing)Aug 82 daysXiao DemingPres. of MPS Asia OperationsSSale−874$530.26−$463.4K−0.3%256.8K after
Aug 10, 2023 (view filing)Aug 82 daysTseng SariaVP & General CounselSSale−874$530.27−$463.5K−0.3%257.6K after
Aug 10, 2023 (view filing)Aug 82 daysHsing MichaelCEOSSale−2.84K$530.26−$1.50M−0.3%1.01M after
Aug 10, 2023 (view filing)Aug 82 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−874$530.26−$463.4K−0.5%188.3K after
Aug 10, 2023 (view filing)Aug 82 daysBlegen TheodoreCFOSSale−724$530.28−$383.9K−0.6%122.3K after
Aug 29, 2023 (view filing)Aug 29Same dayChang Kuo Wei HerbertDirectorSSale−500$500.00−$250.0K−21.8%1.79K after
Oct 4, 2023 (view filing)Oct 22 daysBlegen TheodoreCFOSSale−905$458.30−$414.8K−0.7%121.4K after
Oct 4, 2023 (view filing)Oct 22 daysXiao DemingPres. of MPS Asia OperationsSSale−4.30K$458.30−$1.97M−1.7%252.5K after
Oct 4, 2023 (view filing)Oct 22 daysTseng SariaVP & General CounselSSale−4.30K$458.30−$1.97M−1.7%253.3K after
Oct 4, 2023 (view filing)Oct 22 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−4.30K$458.30−$1.97M−2.3%184.1K after
Oct 4, 2023 (view filing)Oct 22 daysHsing MichaelCEOSSale−11.0K$458.30−$5.02M−1.1%1.00M after
Nov 7, 2023 (view filing)Nov 61 daySciammas MauriceSr. V.P.of Sales and MarketingSSale−982$492.92−$484.0K−0.5%183.1K after
Nov 7, 2023 (view filing)Nov 61 dayHsing MichaelCEOSSale−3.79K$492.92−$1.87M−0.4%999.2K after
Nov 7, 2023 (view filing)Nov 61 dayBlegen TheodoreCFOSSale−847$492.92−$417.5K−0.7%120.6K after
Nov 7, 2023 (view filing)Nov 61 dayTseng SariaVP & General CounselSSale−982$492.92−$484.0K−0.4%252.4K after