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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
Feb 16, 2022 (view filing)Feb 142 daysTseng SariaVP & General CounselSSale−1.66K$429.60−$714.4K−0.6%275.5K after
Feb 16, 2022 (view filing)Feb 142 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−1.66K$429.60−$714.4K−0.6%273.6K after
Feb 9, 2022 (view filing)Feb 7-82 daysTseng SariaVP & General CounselSSale−9.09K$399.62−$3.63M−3.2%277.2K after2 lots
Feb 9, 2022 (view filing)Feb 7-82 daysXiao DemingPres. of MPS Asia OperationsSSale−9.09K$399.62−$3.63M−2.9%301.1K after2 lots
Feb 9, 2022 (view filing)Feb 7-82 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−9.84K$399.60−$3.93M−3.5%275.3K after2 lots
Feb 9, 2022 (view filing)Feb 7-82 daysHsing MichaelCEOSSale−37.3K$399.66−$14.9M−3.4%1.07M after2 lots
Feb 9, 2022 (view filing)Feb 72 daysBlegen TheodoreCFOSSale−6.34K$399.28−$2.53M−4.4%137.2K after
Feb 9, 2022 (view filing)Feb 81 dayBlegen TheodoreCFOSSale−1.12K$401.12−$448.1K−0.8%136.0K after
Jan 24, 2022 (view filing)Jan 204 daysBlegen TheodoreCFOSSale−1.90K$414.45−$786.2K−1.6%116.3K after16 lots
Jan 5, 2022 (view filing)Jan 32 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−4.30K$490.87−$2.11M−1.7%245.4K after
Jan 5, 2022 (view filing)Jan 32 daysXiao DemingPres. of MPS Asia OperationsSSale−4.30K$490.87−$2.11M−1.6%270.5K after
Jan 5, 2022 (view filing)Jan 32 daysBlegen TheodoreCFOSSale−905$490.87−$444.2K−0.8%118.2K after
Jan 5, 2022 (view filing)Jan 32 daysHsing MichaelCEOSSale−11.0K$490.87−$5.38M−1.1%950.3K after
Jan 5, 2022 (view filing)Jan 32 daysTseng SariaVP & General CounselSSale−4.30K$490.87−$2.11M−1.7%246.6K after
Dec 20, 2021 (view filing)Dec 20Same dayBlegen TheodoreCFOSSale−1.90K$474.35−$899.8K−1.6%119.1K after
Dec 2, 2021 (view filing)Nov 302 daysXiao DemingPres. of MPS Asia OperationsSSale−4.37K$560.00−$2.44M−1.6%274.8K after
Nov 23, 2021 (view filing)Nov 221 dayBlegen TheodoreCFOSSale−1.90K$567.54−$1.08M−1.5%121.0K after20 lots
Nov 23, 2021 (view filing)Nov 221 dayXiao DemingPres. of MPS Asia OperationsSSale−427$580.00−$247.7K−0.2%279.2K after
Nov 18, 2021 (view filing)Nov 126 daysLateMoyer James CDirectorSSale−2.00K$555.31−$1.11M−3.0%64.8K after
Nov 16, 2021 (view filing)Nov 124 daysTseng SariaVP & General CounselSSale−1.63K$553.42−$899.3K−0.6%250.9K after
Nov 16, 2021 (view filing)Nov 124 daysHsing MichaelCEOSSale−6.27K$553.42−$3.47M−0.6%961.3K after
Nov 16, 2021 (view filing)Nov 124 daysXiao DemingPres. of MPS Asia OperationsSSale−1.63K$553.42−$899.3K−0.6%279.6K after
Nov 16, 2021 (view filing)Nov 124 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−1.63K$553.42−$899.3K−0.6%272.3K after
Nov 16, 2021 (view filing)Nov 124 daysBlegen TheodoreCFOSSale−1.36K$553.42−$754.9K−1.1%122.9K after
Nov 10, 2021 (view filing)Nov 82 daysHsing MichaelCEOSSale−7.81K$548.27−$4.28M−0.8%987.2K after
Nov 10, 2021 (view filing)Nov 82 daysBlegen TheodoreCFOSSale−1.46K$548.27−$800.5K−1.1%127.1K after
Nov 10, 2021 (view filing)Nov 82 daysXiao DemingPres. of MPS Asia OperationsSSale−2.02K$548.27−$1.11M−0.7%281.3K after
Nov 10, 2021 (view filing)Nov 82 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−2.02K$548.27−$1.11M−0.7%278.8K after
Oct 20, 2021 (view filing)Oct 20Same dayBlegen TheodoreCFOSSale−1.90K$496.59−$942.0K−1.5%125.7K after
Oct 5, 2021 (view filing)Oct 14 daysTseng SariaVP & General CounselSSale−4.33K$476.16−$2.06M−1.7%254.6K after
Oct 5, 2021 (view filing)Oct 14 daysHsing MichaelCEOSSale−11.0K$476.16−$5.25M−1.1%975.4K after
Oct 5, 2021 (view filing)Oct 14 daysBlegen TheodoreCFOSSale−910$476.16−$433.3K−0.7%127.6K after
Oct 5, 2021 (view filing)Oct 14 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−4.33K$476.16−$2.06M−1.5%276.0K after
Sep 21, 2021 (view filing)Sep 201 dayBlegen TheodoreCFOSSale−1.90K$482.99−$916.2K−1.5%128.5K after8 lots
Aug 30, 2021 (view filing)Aug 30Same dayXiao DemingPres. of MPS Asia OperationsSSale−4.89K$500.00−$2.44M−1.7%287.6K after
Aug 26, 2021 (view filing)Aug 242 daysZhou JeffDirectorSSale−300$490.00−$147.0K−5.2%5.51K after
Aug 26, 2021 (view filing)Aug 26Same dayXiao DemingPres. of MPS Asia OperationsSSale−6.50K$489.00−$3.18M−2.2%292.5K after
Aug 23, 2021 (view filing)Aug 194 daysXiao DemingPres. of MPS Asia OperationsSSale−4.74K$462.00−$2.19M−1.6%299.0K after
Aug 23, 2021 (view filing)Aug 203 daysBlegen TheodoreCFOSSale−1.90K$469.24−$890.1K−1.4%130.4K after
Aug 23, 2021 (view filing)Aug 203 daysZhou JeffDirectorSSale−300$477.00−$143.1K−4.9%5.81K after
Aug 16, 2021 (view filing)Aug 124 daysBlegen TheodoreCFOSSale−1.38K$457.10−$630.3K−1.0%132.3K after
Aug 16, 2021 (view filing)Aug 124 daysXiao DemingPres. of MPS Asia OperationsSSale−1.65K$457.10−$754.7K−0.5%303.7K after
Aug 16, 2021 (view filing)Aug 124 daysHsing MichaelCEOSSale−6.37K$457.10−$2.91M−0.6%986.4K after
Aug 16, 2021 (view filing)Aug 124 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−1.65K$457.10−$754.7K−0.6%280.3K after
Aug 16, 2021 (view filing)Aug 124 daysTseng SariaVP & General CounselSSale−1.65K$457.10−$754.7K−0.6%258.9K after
Aug 11, 2021 (view filing)Aug 92 daysXiao DemingPres. of MPS Asia OperationsSSale−2.05K$459.12−$942.6K−0.7%305.3K after
Aug 11, 2021 (view filing)Aug 92 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−2.05K$459.12−$942.6K−0.7%282.0K after
Aug 11, 2021 (view filing)Aug 92 daysHsing MichaelCEOSSale−7.93K$459.12−$3.64M−0.8%992.8K after
Aug 11, 2021 (view filing)Aug 92 daysTseng SariaVP & General CounselSSale−2.05K$459.12−$942.6K−0.8%260.5K after
Aug 11, 2021 (view filing)Aug 92 daysBlegen TheodoreCFOSSale−1.47K$459.12−$676.7K−1.1%133.7K after