MPWR

MONOLITHIC POWER SYSTEMS INC

Latest Form 4:Sale$42KbyDEAN ROBERT W II (Interim CFO) · filed Aug 26, 2026

MONOLITHIC POWER SYSTEMS INC (MPWR) has 90 SEC Form 4 filings (379 transaction rows) in the rolling window, disclosed by 12 distinct insiders. Most recent filing: Aug 26, 2026.

The most active filer is EVP, WW Sales & Marketing Sciammas Maurice with 14 filings. Insiders have net sold $240.9M over the trailing 6 months.

  • Industry:Semiconductors
  • CEO:Michael R. Hsing
  • Employees:4,017
  • HQ:West Palm Beach, FL, US
  • IPO:2004-11-19

Insider Buying

$0

reported purchases (SEC code P)

Insider Selling

$729.0M

reported sales (SEC code S)

Unique Insiders

12

in the rolling window

Market Cap

$61.7B

latest known value

Source
Sale$42KAug 26SEC ↗
Sale$64KAug 25SEC ↗
Sale$8KAug 20SEC ↗
CHANG KUO WEI HERBERTFirst in 9 months
Sale$71KAug 13SEC ↗
Sale$141KAug 6SEC ↗
Sale$40KAug 5SEC ↗
Sale$20.2MJul 17SEC ↗
Sale$41KJul 6SEC ↗
Sale$46KJun 3SEC ↗
Sale$12.9MMay 29SEC ↗
Sale$36KMay 28SEC ↗
Sale$816KMay 27SEC ↗
Sale$7.9MMay 27SEC ↗
DEAN ROBERT W IIFirst filing
Sale$6KMay 20SEC ↗
Hsing MichaelFirst in 3 months
Sale$59.3MMay 20SEC ↗
Sale$18.7MMay 19SEC ↗
Elmiger Eugen JFirst in 8 months
Sale$19.0MMay 8SEC ↗
Sale$49.6MMay 8SEC ↗
Wynne EileenFirst filing
Sale$530KMay 8SEC ↗
Zhou JeffFirst filing
Sale$1.6MMay 6SEC ↗
Zhou JeffFirst filing
Sale$825KMay 6SEC ↗
Sale$602KMay 6SEC ↗
Sale$48KMay 6SEC ↗
Sale$11.7MApr 10SEC ↗
Sale$8.9MApr 8SEC ↗
Sale$1.6MApr 3SEC ↗
Sale$33KApr 3SEC ↗
Sale$25.9MApr 1SEC ↗
Sale$33KMar 24SEC ↗
Sale$38.7MFeb 17SEC ↗
Sale$39.2MFeb 13SEC ↗
Sale$38.8MFeb 12SEC ↗
Sale$236KFeb 12SEC ↗
Sale$485KFeb 11SEC ↗
Sale$26.8MFeb 10SEC ↗
Xiao DemingFirst filing
Sale$26.8MFeb 10SEC ↗
Sale$64.3MFeb 10SEC ↗
Sale$26.8MFeb 10SEC ↗
Sale$25.4MFeb 10SEC ↗
Sale$3.4MFeb 4SEC ↗
Sale$2.8MJan 6SEC ↗
Sale$559KJan 6SEC ↗
Lee Victor KFirst filing
Sale$952KDec 29SEC ↗
Sale$2.7MDec 2SEC ↗
Sale$18.1MNov 28SEC ↗
Sale$18.5MNov 28SEC ↗
Sale$90KNov 25SEC ↗
Sale$3.6MNov 25SEC ↗
Sale$87KNov 24SEC ↗
Sale$30.8MNov 20SEC ↗
Hsing MichaelFirst filing
Sale$38.3MNov 13SEC ↗
Hsing MichaelFirst filing
Sale$35.7MNov 13SEC ↗
Sciammas MauriceFirst filing
Sale$197KNov 6SEC ↗
Sale$3.1MNov 4SEC ↗
Sale$1.4MOct 24SEC ↗
Sale$14.3MOct 17SEC ↗
Sale$2.9MOct 17SEC ↗
Sale$2.7MOct 1SEC ↗
Martinez CarintiaFirst filing
Sale$1.3MSep 23SEC ↗
Tseng SariaFirst filing
Sale$13.3MSep 23SEC ↗
BLEGEN THEODOREFirst filing
Sale$2.4MSep 3SEC ↗
Elmiger Eugen JFirst filing
Sale$3.4MSep 2SEC ↗

Congress trading MPWR

See timeline →
  • RRep. Byron DonaldsSale$1,001 - $15,0002026-06-05
  • RRep. Byron DonaldsSale$1,001 - $15,0002026-06-05

STOCK Act disclosures are filed up to 45 days after the trade. Amount is a disclosed range, not an exact figure.

Related companies

MONOLITHIC POWER SYSTEMS INC is in the Technology sector.