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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 12, 2022 (view filing)Aug 12Same daySciammas MauriceSr. V.P.of Sales and MarketingSSale−1.63K$525.95−$858.9K−0.8%214.5K after
Aug 12, 2022 (view filing)Aug 12Same dayHsing MichaelCEOSSale−6.31K$525.95−$3.32M−0.6%1.02M after
Aug 12, 2022 (view filing)Aug 12Same dayBlegen TheodoreCFOSSale−1.37K$525.95−$720.0K−1.1%126.8K after
Aug 12, 2022 (view filing)Aug 111 dayZhou JeffDirectorSSale−200$540.00−$108.0K−3.4%5.65K after
Sep 26, 2022 (view filing)Sep 224 daysMoyer James CDirectorSSale−9.80K$385.89−$3.78M−10.6%82.9K after16 lots
Oct 4, 2022 (view filing)Oct 31 dayTseng SariaVP & General CounselSSale−4.30K$372.60−$1.60M−1.6%257.1K after
Oct 4, 2022 (view filing)Oct 31 dayHsing MichaelCEOSSale−11.0K$372.60−$4.08M−1.1%1.01M after
Oct 4, 2022 (view filing)Oct 31 dayXiao DemingPres. of MPS Asia OperationsSSale−4.30K$372.60−$1.60M−1.5%275.2K after
Oct 4, 2022 (view filing)Oct 31 daySciammas MauriceSr. V.P.of Sales and MarketingSSale−4.30K$372.60−$1.60M−2.0%210.2K after
Oct 4, 2022 (view filing)Oct 31 dayBlegen TheodoreCFOSSale−905$372.60−$337.2K−0.7%125.9K after
Nov 7, 2022 (view filing)Nov 43 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−982$343.98−$337.8K−0.5%209.2K after
Nov 7, 2022 (view filing)Nov 43 daysBlegen TheodoreCFOSSale−847$343.98−$291.4K−0.7%125.1K after
Nov 7, 2022 (view filing)Nov 43 daysXiao DemingPres. of MPS Asia OperationsSSale−982$343.98−$337.8K−0.4%274.2K after
Nov 7, 2022 (view filing)Nov 43 daysTseng SariaVP & General CounselSSale−982$343.98−$337.8K−0.4%256.1K after
Nov 7, 2022 (view filing)Nov 43 daysHsing MichaelCEOSSale−3.79K$343.98−$1.30M−0.4%1.00M after
Nov 9, 2022 (view filing)Nov 72 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−4.00K$355.74−$1.42M−1.9%205.2K after
Nov 16, 2022 (view filing)Nov 14-152 daysBlegen TheodoreCFOSSale−1.39K$392.53−$544.4K−1.1%123.7K after2 lots
Nov 16, 2022 (view filing)Nov 142 daysHsing MichaelCEOSSale−5.35K$390.33−$2.09M−0.5%996.7K after
Nov 16, 2022 (view filing)Nov 151 dayHsing MichaelCEOSSale−1.07K$405.51−$435.5K−0.1%995.7K after
Nov 16, 2022 (view filing)Nov 14-152 daysTseng SariaVP & General CounselSSale−1.66K$392.70−$653.5K−0.6%254.4K after2 lots
Nov 16, 2022 (view filing)Nov 14-152 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−1.66K$392.88−$653.7K−0.8%203.6K after2 lots
Nov 16, 2022 (view filing)Nov 14-152 daysXiao DemingPres. of MPS Asia OperationsSSale−3.76K$401.92−$1.51M−1.4%270.4K after2 lots
Nov 25, 2022 (view filing)Nov 223 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−5.20K$369.27−$1.92M−2.6%198.4K after
Dec 12, 2022 (view filing)Dec 12Same dayMoyer James CDirectorSSale−40.0K$386.53−$15.5M−48.2%42.9K after7 lots
Jan 5, 2023 (view filing)Jan 32 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−5.53K$344.96−$1.91M−2.8%192.9K after
Jan 5, 2023 (view filing)Jan 32 daysXiao DemingPres. of MPS Asia OperationsSSale−5.53K$344.96−$1.91M−2.0%264.9K after
Jan 5, 2023 (view filing)Jan 32 daysBlegen TheodoreCFOSSale−1.88K$344.96−$649.9K−1.5%121.8K after
Jan 5, 2023 (view filing)Jan 32 daysHsing MichaelCEOSSale−14.9K$344.96−$5.14M−1.5%980.8K after
Jan 5, 2023 (view filing)Jan 32 daysTseng SariaVP & General CounselSSale−5.53K$344.96−$1.91M−2.2%248.9K after
Jan 17, 2023 (view filing)Jan 125 daysXiao DemingPres. of MPS Asia OperationsSSale−2.98K$400.00−$1.19M−1.1%261.9K after
Jan 25, 2023 (view filing)Jan 241 dayXiao DemingPres. of MPS Asia OperationsSSale−10.2K$430.00−$4.40M−3.9%251.7K after
Feb 8, 2023 (view filing)Feb 62 daysBlegen TheodoreCFOSSale−608$446.87−$271.7K−0.5%121.2K after
Feb 8, 2023 (view filing)Feb 62 daysHsing MichaelCEOSSale−3.69K$446.88−$1.65M−0.4%977.1K after
Feb 8, 2023 (view filing)Feb 62 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−723$446.87−$323.1K−0.4%192.1K after
Feb 8, 2023 (view filing)Feb 62 daysTseng SariaVP & General CounselSSale−723$446.88−$323.1K−0.3%248.2K after
Feb 8, 2023 (view filing)Feb 62 daysXiao DemingPres. of MPS Asia OperationsSSale−723$446.88−$323.1K−0.3%251.0K after
Feb 10, 2023 (view filing)Feb 82 daysXiao DemingPres. of MPS Asia OperationsSSale−6.92K$462.41−$3.20M−2.4%278.8K after
Feb 10, 2023 (view filing)Feb 82 daysTseng SariaVP & General CounselSSale−6.92K$462.41−$3.20M−2.4%276.0K after
Feb 10, 2023 (view filing)Feb 82 daysBlegen TheodoreCFOSSale−5.68K$462.41−$2.63M−3.9%138.4K after
Feb 10, 2023 (view filing)Feb 82 daysHsing MichaelCEOSSale−22.5K$462.41−$10.4M−2.1%1.07M after
Feb 10, 2023 (view filing)Feb 82 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−6.92K$462.41−$3.20M−3.1%220.0K after
Feb 10, 2023 (view filing)Feb 91 dayXiao DemingPres. of MPS Asia OperationsSSale−2.13K$520.00−$1.11M−0.8%276.6K after
Feb 13, 2023 (view filing)Feb 13Same dayTseng SariaVP & General CounselSSale−1.64K$492.31−$806.9K−0.6%274.4K after
Feb 13, 2023 (view filing)Feb 13Same dayXiao DemingPres. of MPS Asia OperationsSSale−1.64K$492.31−$806.9K−0.6%275.0K after
Feb 13, 2023 (view filing)Feb 13Same daySciammas MauriceSr. V.P.of Sales and MarketingSSale−1.64K$492.31−$806.9K−0.7%218.3K after
Feb 13, 2023 (view filing)Feb 13Same dayHsing MichaelCEOSSale−6.33K$492.31−$3.12M−0.6%1.06M after
Feb 13, 2023 (view filing)Feb 13Same dayBlegen TheodoreCFOSSale−1.37K$492.31−$675.9K−1.0%137.0K after
Feb 17, 2023 (view filing)Feb 152 daysXiao DemingPres. of MPS Asia OperationsSSale−1.50K$530.00−$793.4K−0.5%273.5K after
Feb 17, 2023 (view filing)Feb 152 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−13.0K$519.54−$6.75M−6.0%205.3K after4 lots
Feb 21, 2023 (view filing)Feb 165 daysBlegen TheodoreCFOSSale−5.00K$521.13−$2.61M−3.6%132.0K after2 lots