MPWR
−$278.2K
244 sh @ $1,140
MPWR
MONOLITHIC POWER SYSTEMS INC
SEC CIK 1280452
$1,577.32
+39.0% · 90 days
90-day buys
$0
0 open-market
90-day sells
$220.23M
79 open-market
Net insider flow
−$220.23M
Net selling
Filings shown
105
Most recent
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At a glance
Over the last 90 days, insiders at MPWR have sold a net $220.23M of stock (0 open-market buys vs 79 sells).
Largest recent trade: Xiao Deming sold $23.42M of MPWR, trimming their stake 6%.
Most active filer: Hsing Michael, with 35 transactions among the recent filings shown.
Insider transaction history
Form 4 filings for MPWR, newest firstMPWR
−$636.3K
556 sh @ $1,144
MPWR
−$551.5K
480 sh @ $1,149
MPWR
−$649.4K
560 sh @ $1,160
MPWR
−$797.3K
684 sh @ $1,166
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MPWR
−$2.38M
2,036 sh @ $1,170
MPWR
−$1.98M
1,680 sh @ $1,176
MPWR
−$1.65M
1,396 sh @ $1,180
MPWR
−$651.6K
576 sh @ $1,131
MPWR
−$208.3K
184 sh @ $1,132
MPWR
−$181.5K
160 sh @ $1,134
MPWR
−$213.6K
188 sh @ $1,136
MPWR
−$332K
292 sh @ $1,137
MPWR
−$33.5K
30 sh @ $1,116
MPWR
−$5.16M
5,154 sh @ $1,001
MPWR
−$9.13M
9,080 sh @ $1,005
MPWR
−$3.39M
3,360 sh @ $1,010
MPWR
−$3.25M
3,194 sh @ $1,017
MPWR
−$2.25M
2,200 sh @ $1,023
MPWR
−$2.51M
2,440 sh @ $1,029
MPWR
−$171.9K
166 sh @ $1,036
MPWR
−$83.3K
80 sh @ $1,041
MPWR
−$32.9K
30 sh @ $1,095
MPWR
−$14.71M
12,731 sh @ $1,156
MPWR
−$5.79M
4,992 sh @ $1,160
MPWR
−$4.66M
4,001 sh @ $1,165
MPWR
−$2.43M
2,076 sh @ $1,169
MPWR
−$234.7K
200 sh @ $1,173
MPWR
−$566.8K
480 sh @ $1,181
MPWR
−$190.1K
160 sh @ $1,188
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About MPWR insider activity
This page tracks every recent Form 4 filed for MONOLITHIC POWER SYSTEMS INC with the U.S. Securities and Exchange Commission. Form 4 is the disclosure that company insiders — officers, directors, and holders of more than 10% of the stock — must file within two business days of buying or selling shares.
The summary above nets open-market purchases against open-market sales over the trailing 90 days. Open-market trades (codes P and S) tend to carry the most signal because they reflect a deliberate choice to put money in or take it out, as opposed to routine grants, option exercises, or tax-withholding events. Use the badges on each row to tell them apart, and always confirm details against the original filing before drawing conclusions.
Frequently asked questions
How often is MPWR insider data updated?
Continuously. We read from SEC EDGAR, so new Form 4 filings for MONOLITHIC POWER SYSTEMS INC usually appear here within minutes of being accepted by the SEC.
What does "net insider flow" mean?
It is the total dollar value of open-market insider purchases minus open-market sales over the last 90 days. A positive number (green) means insiders bought more than they sold; a negative number (red) means the reverse.
Why do some rows show grants or option exercises instead of buys?
Insiders receive stock through compensation as well as buying it outright. Form 4 captures all of these. We label each transaction by its SEC code so you can focus on open-market activity if you prefer.
Is this investment advice?
No. InsiderSource presents public filing data for informational purposes only. Insider activity is one of many factors to consider and is never a recommendation to buy or sell.