Skip to main content

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 2, 2024 (view filing)Aug 11 dayBlegen TheodoreEVP and CFOSSale−2.50K$852.51−$2.13M−3.7%64.9K after9 lots10b5-1
Jul 24, 2024 (view filing)Jul 222 daysXiao DemingEVP, Global OperationsSSale−3.21K$831.58−$2.67M−1.6%203.2K after
Jul 24, 2024 (view filing)Jul 222 daysTseng SariaEVP & General CounselSSale−3.21K$831.58−$2.67M−1.9%161.4K after
Jul 24, 2024 (view filing)Jul 222 daysSciammas MauriceEVP, WW Sales & MarketingSSale−3.21K$831.58−$2.67M−2.7%115.7K after
Jul 24, 2024 (view filing)Jul 222 daysHsing MichaelCEOSSale−9.61K$831.58−$7.99M−1.1%868.1K after
Jul 24, 2024 (view filing)Jul 222 daysBlegen TheodoreEVP and CFOSSale−2.58K$831.58−$2.15M−3.7%67.4K after
Jul 10, 2024 (view filing)Jul 82 daysSciammas MauriceEVP, WW Sales & MarketingSSale−11.0K$843.83−$9.28M−8.5%118.9K after10 lots10b5-1
Jul 2, 2024 (view filing)Jul 2Same dayTseng SariaEVP & General CounselSSale−1.86K$824.65−$1.53M−1.1%164.6K after10b5-1
Jul 2, 2024 (view filing)Jul 11 dayBlegen TheodoreEVP and CFOSSale−2.50K$804.19−$2.01M−3.4%70.0K after6 lots10b5-1
Jul 2, 2024 (view filing)Jul 11 dayHsing MichaelCEOSSale−2.67K$804.57−$2.15M−0.3%877.7K after7 lots10b5-1
Jul 2, 2024 (view filing)Jul 11 dayTseng SariaEVP & General CounselSSale−37.1K$808.20−$30.0M−18.2%166.4K after18 lots10b5-1
Jul 1, 2024 (view filing)Jun 283 daysLee Victor KDirectorSSale−1.00K$820.46−$820.5K−3.3%29.2K after10b5-1
Jun 5, 2024 (view filing)Jun 32 daysHsing MichaelCEOSSale−8.00K$731.08−$5.85M−0.9%880.4K after26 lots10b5-1
Jun 5, 2024 (view filing)Jun 3-102 daysBlegen TheodoreEVP and CFOSSale−2.50K$731.77−$1.83M−3.3%72.5K after20 lots10b5-1
May 22, 2024 (view filing)May 22Same dayXiao DemingEVP, Global OperationsSSale−1.30K$769.40−$1.00M−0.6%206.4K after
May 22, 2024 (view filing)May 202 daysChang Kuo Wei HerbertDirectorSSale−200$750.00−$150.0K−21.3%741 after
May 22, 2024 (view filing)May 202 daysZhou JeffDirectorSSale−200$750.00−$150.0K−3.2%6.07K after
May 15, 2024 (view filing)May 15Same dayChang Kuo Wei HerbertDirectorSSale−200$735.00−$147.0K−17.5%941 after2 lots
May 9, 2024 (view filing)May 81 dayTseng SariaEVP & General CounselSSale−869$690.02−$599.6K−0.4%203.5K after
May 9, 2024 (view filing)May 81 daySciammas MauriceEVP, WW Sales & MarketingSSale−869$690.00−$599.6K−0.7%129.9K after
May 9, 2024 (view filing)May 81 dayBlegen TheodoreEVP and CFOSSale−737$689.98−$508.5K−1.0%75.0K after
May 9, 2024 (view filing)May 81 dayHsing MichaelCEOSSale−2.82K$690.00−$1.95M−0.3%888.4K after
May 9, 2024 (view filing)May 81 dayXiao DemingEVP, Global OperationsSSale−869$690.02−$599.6K−0.4%207.7K after
May 3, 2024 (view filing)May 12 daysBlegen TheodoreEVP and CFOSSale−2.50K$663.29−$1.66M−3.2%75.7K after10 lots10b5-1
May 3, 2024 (view filing)May 12 daysHsing MichaelCEOSSale−8.00K$661.85−$5.29M−0.9%891.2K after16 lots10b5-1
Apr 9, 2024 (view filing)Apr 81 daySciammas MauriceEVP of Sales and MarketingSSale−11.0K$681.83−$7.50M−7.8%130.7K after17 lots10b5-1
Apr 3, 2024 (view filing)Apr 12 daysHsing MichaelCEOSSale−8.00K$677.44−$5.42M−0.9%899.2K after15 lots10b5-1
Apr 3, 2024 (view filing)Apr 12 daysBlegen TheodoreEVP & CFOSSale−2.50K$677.40−$1.69M−3.1%78.2K after12 lots10b5-1
Mar 4, 2024 (view filing)Mar 13 daysHsing MichaelCEOSSale−8.00K$726.08−$5.81M−0.9%907.2K after15 lots10b5-1
Mar 4, 2024 (view filing)Mar 13 daysBlegen TheodoreCFOSSale−2.50K$725.76−$1.81M−3.0%80.7K after12 lots10b5-1
Feb 29, 2024 (view filing)Feb 29Same dayChang Kuo Wei HerbertDirectorSSale−250$706.34−$176.6K−18.0%1.14K after
Feb 23, 2024 (view filing)Feb 221 dayChang Kuo Wei HerbertDirectorSSale−250$750.00−$187.5K−15.2%1.39K after
Feb 13, 2024 (view filing)Feb 121 dayZhou JeffDirectorSSale−200$750.57−$150.1K−3.1%6.27K after
Feb 9, 2024 (view filing)Feb 81 dayXiao DemingPres. of MPS Asia OperationsSSale−859$680.00−$584.1K−0.4%208.6K after
Feb 9, 2024 (view filing)Feb 81 dayTseng SariaExecutive VP & General CounselSSale−859$680.00−$584.1K−0.4%204.3K after
Feb 9, 2024 (view filing)Feb 81 daySciammas MauriceSr. V.P.of Sales and MarketingSSale−859$680.00−$584.1K−0.6%141.7K after
Feb 9, 2024 (view filing)Feb 81 dayHsing MichaelCEOSSale−2.79K$680.00−$1.90M−0.3%915.2K after
Feb 9, 2024 (view filing)Feb 81 dayBlegen TheodoreCFOSSale−728$680.00−$495.0K−0.9%83.2K after
Feb 7, 2024 (view filing)Feb 52 daysXiao DemingPres. of MPS Asia OperationsSSale−982$641.00−$629.5K−0.5%209.4K after
Feb 7, 2024 (view filing)Feb 52 daysTseng SariaExecutive VP & General CounselSSale−982$641.00−$629.5K−0.5%205.2K after
Feb 7, 2024 (view filing)Feb 52 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−982$641.00−$629.5K−0.7%142.6K after
Feb 7, 2024 (view filing)Feb 52 daysHsing MichaelCEOSSale−3.79K$641.00−$2.43M−0.4%918.0K after
Feb 7, 2024 (view filing)Feb 52 daysBlegen TheodoreCFOSSale−867$641.00−$555.7K−1.0%83.9K after
Feb 5, 2024 (view filing)Feb 14 daysHsing MichaelCEOSSale−8.00K$602.01−$4.82M−0.9%921.8K after15 lots10b5-1
Feb 5, 2024 (view filing)Feb 14 daysBlegen TheodoreCFOSSale−2.50K$603.26−$1.51M−2.9%84.8K after8 lots10b5-1
Jan 12, 2024 (view filing)Jan 12Same daySciammas MauriceSr. V.P.of Sales and MarketingSSale−11.0K$582.11−$6.40M−7.1%143.6K after12 lots10b5-1
Jan 11, 2024 (view filing)Jan 101 dayXiao DemingPres. of MPS Asia OperationsSSale−11.5K$589.35−$6.79M−5.2%210.4K after11 lots10b5-1
Jan 10, 2024 (view filing)Jan 91 dayTseng SariaExecutive VP & General CounselSSale−1.39K$600.00−$834.0K−0.7%206.2K after10b5-1
Jan 9, 2024 (view filing)Jan 54 daysHsing MichaelCEOSSale−8.00K$572.28−$4.58M−0.9%929.8K after10 lots10b5-1
Jan 8, 2024 (view filing)Jan 44 daysTseng SariaExecutive VP & General CounselSSale−25.3K$583.14−$14.8M−10.9%207.6K after