MPWR
insider transactionsMONOLITHIC POWER SYSTEMS INC — buys & sells by directors, officers and 10% owners A shareholder owning more than 10% of the company. Must report trades, but usually a weaker signal than an officer or director. (SEC Form 4).
Net shares · 30d
-8.1K
0 buy · 8.1K sell
Net value · 30d
-$13.8M
$0 in · $13.8M out
Sentiment · 30d
Net selling
0% buying · 100% selling
Open-market trades · 30d
4
0 buy · 8.1K sell
Net buy / sell volume
Not enough data to chart yet.
Tap or hover the chart for daily net volume. Green = net buying, red = net selling.
All transactions
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Sell·S
EVP, WW Sales & Marketing · 10b5-1
$46.0K
30 sh · $1,533.95
Own -2%
-
Other·G
EVP, WW Sales & Marketing
$0
12.5K sh
Own -50%
-
Sell·S
EVP & General Counsel
$12.9M
7.6K sh · $1,700.00
Own -5%
-
Sell·S
Director
$816.5K
486 sh · $1,680.00
Own -11%
-
Sell·S
Robert W Dean II KEY
Interim CFO
$36.3K
22 sh · $1,649.56
Own -0%
| Date▾ | Insider | Type | Shares | Value |
|---|---|---|---|---|
| Jun 1, 2026 | Maurice Sciammas 10b5-1 | Sell S | 30 | $46.0K |
| May 29, 2026 | Maurice Sciammas | Other G | 12.5K | $0 |
| May 27, 2026 | Saria Tseng | Sell S | 7.6K | $12.9M |
| May 26, 2026 | Jeff Zhou | Sell S | 486 | $816.5K |
| May 26, 2026 | Robert W Dean II KEY | Sell S | 22 | $36.3K |
About MPWR insider trading
This page tracks insider transactions for MONOLITHIC POWER SYSTEMS INC (MPWR) reported to the U.S. Securities and Exchange Commission on Form 4. Corporate insiders — directors, executive officers and beneficial owners of more than 10% of the stock — must disclose their trades within two business days. Open-market purchases (code P) and sales (code S) made at the insider's discretion are the most-watched opportunistic signals, while awards (A), option exercises (M) and tax-withholding (F) reflect compensation rather than conviction. Trades marked 10b5-1 were made under a pre-arranged plan and are considered routine. A cluster buy — several insiders buying within a short window — is historically a stronger bullish indicator than any single trade.