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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
Dec 2, 2021 (view filing)Nov 302 daysXiao DemingPres. of MPS Asia OperationsSSale−4.37K$560.00−$2.44M−1.6%274.8K after
Dec 20, 2021 (view filing)Dec 20Same dayBlegen TheodoreCFOSSale−1.90K$474.35−$899.8K−1.6%119.1K after
Jan 5, 2022 (view filing)Jan 32 daysTseng SariaVP & General CounselSSale−4.30K$490.87−$2.11M−1.7%246.6K 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 daysBlegen TheodoreCFOSSale−905$490.87−$444.2K−0.8%118.2K 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 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−4.30K$490.87−$2.11M−1.7%245.4K after
Jan 24, 2022 (view filing)Jan 204 daysBlegen TheodoreCFOSSale−1.90K$414.45−$786.2K−1.6%116.3K after16 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
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 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 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 daysTseng SariaVP & General CounselSSale−9.09K$399.62−$3.63M−3.2%277.2K after2 lots
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 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 daysXiao DemingPres. of MPS Asia OperationsSSale−1.66K$429.60−$714.4K−0.6%299.5K after
Feb 16, 2022 (view filing)Feb 142 daysHsing MichaelCEOSSale−6.42K$429.60−$2.76M−0.6%1.06M after
Feb 16, 2022 (view filing)Feb 142 daysBlegen TheodoreCFOSSale−1.39K$429.60−$595.9K−1.0%134.7K after
Feb 24, 2022 (view filing)Feb 222 daysBlegen TheodoreCFOSSale−1.54K$452.11−$695.8K−1.1%133.2K after15 lots
Apr 5, 2022 (view filing)Apr 14 daysXiao DemingPres. of MPS Asia OperationsSSale−4.42K$467.23−$2.07M−1.5%295.0K after
Apr 5, 2022 (view filing)Apr 14 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−4.42K$467.23−$2.07M−1.6%269.2K after
Apr 5, 2022 (view filing)Apr 14 daysHsing MichaelCEOSSale−11.3K$467.23−$5.26M−1.1%1.05M after
Apr 5, 2022 (view filing)Apr 14 daysTseng SariaVP & General CounselSSale−4.42K$467.23−$2.07M−1.6%271.2K after
Apr 5, 2022 (view filing)Apr 14 daysBlegen TheodoreCFOSSale−930$467.22−$434.5K−0.7%132.2K after
May 5, 2022 (view filing)May 41 dayHsing MichaelCEOSSale−3.81K$453.15−$1.73M−0.4%1.04M after
May 5, 2022 (view filing)May 41 dayTseng SariaVP & General CounselSSale−986$453.16−$446.8K−0.4%270.2K after
May 5, 2022 (view filing)May 6–Xiao DemingPres. of MPS Asia OperationsSSale−986$453.16−$446.8K−0.3%294.1K after
May 5, 2022 (view filing)May 41 daySciammas MauriceSr. V.P.of Sales and MarketingSSale−986$453.16−$446.8K−0.4%268.2K after
May 5, 2022 (view filing)May 41 dayBlegen TheodoreCFOSSale−850$453.16−$385.2K−0.6%131.4K after
May 16, 2022 (view filing)May 124 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−1.68K$388.10−$651.6K−0.7%225.9K after
May 16, 2022 (view filing)May 124 daysHsing MichaelCEOSSale−6.48K$388.10−$2.52M−0.6%1.04M after
May 16, 2022 (view filing)May 124 daysTseng SariaVP & General CounselSSale−1.68K$388.10−$651.6K−0.6%268.5K after
May 16, 2022 (view filing)May 124 daysBlegen TheodoreCFOSSale−1.40K$388.10−$541.4K−1.1%130.0K after
May 16, 2022 (view filing)May 124 daysXiao DemingPres. of MPS Asia OperationsSSale−1.68K$388.10−$651.6K−0.6%292.4K after
May 26, 2022 (view filing)May 242 daysXiao DemingPres. of MPS Asia OperationsSSale−4.30K$392.44−$1.69M−1.5%288.1K after
May 31, 2022 (view filing)May 274 daysXiao DemingPres. of MPS Asia OperationsSSale−1.50K$457.00−$683.2K−0.5%286.6K after
Jul 6, 2022 (view filing)Jul 15 daysHsing MichaelCEOSSale−11.5K$361.57−$4.16M−1.1%1.03M after
Jul 6, 2022 (view filing)Jul 15 daysBlegen TheodoreCFOSSale−950$361.58−$343.5K−0.7%129.0K after
Jul 6, 2022 (view filing)Jul 15 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−4.51K$361.58−$1.63M−2.0%221.4K after
Jul 6, 2022 (view filing)Jul 15 daysTseng SariaVP & General CounselSSale−4.51K$361.58−$1.63M−1.7%264.0K after
Jul 6, 2022 (view filing)Jul 15 daysXiao DemingPres. of MPS Asia OperationsSSale−4.51K$361.58−$1.63M−1.6%282.1K after
Aug 3, 2022 (view filing)Aug 3Same dayZhou JeffDirectorSSale−200$520.00−$104.0K−3.3%5.85K after
Aug 8, 2022 (view filing)Aug 44 daysSciammas MauriceSr. V.P.of Sales and MarketingSSale−5.18K$529.61−$2.75M−2.3%216.2K after3 lots
Aug 8, 2022 (view filing)Aug 44 daysTseng SariaVP & General CounselSSale−984$522.39−$514.0K−0.4%263.0K after
Aug 8, 2022 (view filing)Aug 44 daysHsing MichaelCEOSSale−3.80K$522.39−$1.98M−0.4%1.02M after
Aug 8, 2022 (view filing)Aug 44 daysBlegen TheodoreCFOSSale−848$522.38−$443.0K−0.7%128.2K after
Aug 8, 2022 (view filing)Aug 44 daysXiao DemingPres. of MPS Asia OperationsSSale−984$522.39−$514.0K−0.3%281.1K after
Aug 12, 2022 (view filing)Aug 12Same dayXiao DemingPres. of MPS Asia OperationsSSale−1.63K$525.95−$858.9K−0.6%279.5K after
Aug 12, 2022 (view filing)Aug 12Same dayTseng SariaVP & General CounselSSale−1.63K$525.95−$858.9K−0.6%261.4K after