MPWR
−$46K
30 sh @ $1,534
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
−$0
12,472 sh
MPWR
−$12.86M
7,565 sh @ $1,700
MPWR
−$36.3K
22 sh @ $1,650
MPWR
−$816.5K
486 sh @ $1,680
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MPWR
−$0
200 sh
MPWR
−$7.93M
5,000 sh @ $1,586
MPWR
−$5.01M
3,424 sh @ $1,463
MPWR
−$8.54M
5,819 sh @ $1,468
MPWR
−$7.44M
5,049 sh @ $1,473
MPWR
−$6.03M
4,082 sh @ $1,477
MPWR
−$8.51M
5,737 sh @ $1,483
MPWR
−$9.94M
6,688 sh @ $1,487
MPWR
−$1.29M
862 sh @ $1,491
MPWR
−$911.7K
608 sh @ $1,499
MPWR
−$4.4M
2,929 sh @ $1,503
MPWR
−$5.68M
3,769 sh @ $1,508
MPWR
−$833.7K
551 sh @ $1,513
MPWR
−$534.4K
352 sh @ $1,518
MPWR
−$197.8K
130 sh @ $1,521
MPWR
−$6.3K
4 sh @ $1,563
MPWR
−$5.8M
3,741 sh @ $1,550
MPWR
−$2.67M
1,717 sh @ $1,557
MPWR
−$3.14M
2,010 sh @ $1,562
MPWR
−$3.17M
2,020 sh @ $1,567
MPWR
−$2.06M
1,312 sh @ $1,571
MPWR
−$1.11M
703 sh @ $1,578
MPWR
−$707.2K
447 sh @ $1,582
MPWR
−$79.3K
50 sh @ $1,586
MPWR
+$0
1,563 sh
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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.