MPWR
−$0
2,156 sh
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
−$499.2K
320 sh @ $1,560
MPWR
−$1.28M
814 sh @ $1,566
MPWR
−$1.69M
1,078 sh @ $1,572
MPWR
−$1.31M
834 sh @ $1,576
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MPWR
−$2.97M
1,879 sh @ $1,582
MPWR
−$4.11M
2,587 sh @ $1,587
MPWR
−$2.16M
1,355 sh @ $1,591
MPWR
−$4.18M
2,619 sh @ $1,596
MPWR
−$822.5K
514 sh @ $1,600
MPWR
−$5.49M
3,329 sh @ $1,648
MPWR
−$23.42M
14,167 sh @ $1,653
MPWR
−$19.23M
11,597 sh @ $1,658
MPWR
−$1.51M
907 sh @ $1,661
MPWR
−$530.2K
335 sh @ $1,583
MPWR
−$825K
500 sh @ $1,650
MPWR
−$809.3K
514 sh @ $1,574
MPWR
−$800K
500 sh @ $1,600
MPWR
−$601.8K
380 sh @ $1,584
MPWR
−$47.7K
30 sh @ $1,589
MPWR
−$709.2K
560 sh @ $1,266
MPWR
−$457.3K
360 sh @ $1,270
MPWR
−$307.1K
240 sh @ $1,280
MPWR
−$154.5K
120 sh @ $1,287
MPWR
−$516.8K
400 sh @ $1,292
MPWR
−$1.04M
800 sh @ $1,303
MPWR
−$1.67M
1,279 sh @ $1,308
MPWR
−$5.57M
4,244 sh @ $1,313
MPWR
−$1.11M
840 sh @ $1,319
MPWR
−$158.6K
120 sh @ $1,322
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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.