sellNotable cluster of 5

Saria Tseng sold $19M of MPWR

EVP & General Counsel at MONOLITHIC POWER SYSTEMS INC. 20,000 shares at an average of $926.47, traded Nov 26, 2025, filed Nov 28, 2025.

Warning score

Value

$19M

20,000 shares

Holdings after

167,331

-11% from before

From 52-week low

+104%

low $450.40, close $918.78

From 52-week high

-16%

high $1,097.68, as of Nov 26, 2025

Score components

Role
Officer
+15
Trade size
$18.5M at market
+25
Share of holdings sold
Sold 11% of holdings
+5
Cluster
5 insiders selling within 14 days
+15

What happened after comparable sells

Same side and tier, against the S&P 500, at 1, 3 and 6 months. Shown to Pro users; the whole table is on the backtest page.

This signal so far: 1m +2.0%, 3m +23.3%, 6m +69.4%.

Price around the trade, and since

From a quarter before the trade to today. The arrow is the trade, the circle the day the filing reached EDGAR, which is the first day anyone outside could act; the dotted line is the S&P 500 rebased to that day's close.

MPWROct 9, 2026 · close 1,386

Since filing Nov 28, 2025: +50.4%SPY +15.1% · excess +35.3%

Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value; the dashed line is the close on the filing day, the dotted line SPY rebased to it.Charts by TradingView Lightweight Charts™

Rows in this filing

Every transaction in Form 4 0001214659-25-017305, as filed. Open on EDGAR

Date	Transaction	Shares	Price	Value	Holdings after	Filed
Nov 26, 2025	SOpen-market sale Common Stock	-240	$922.78	$221k	187,091	Nov 28, 2025
Nov 26, 2025	SOpen-market sale Common Stock	-1,200	$923.54	$1.1M	185,891	Nov 28, 2025
Nov 26, 2025	SOpen-market sale Common Stock	-1,327	$924.32	$1.2M	184,564	Nov 28, 2025
Nov 26, 2025	SOpen-market sale Common Stock	-1,126	$925.55	$1.0M	183,438	Nov 28, 2025
Nov 26, 2025	SOpen-market sale Common Stock	-10,360	$926.02	$9.6M	173,078	Nov 28, 2025
Nov 26, 2025	SOpen-market sale Common Stock	-1,845	$927.41	$1.7M	171,233	Nov 28, 2025
Nov 26, 2025	SOpen-market sale Common Stock	-984	$928.60	$914k	170,249	Nov 28, 2025
Nov 26, 2025	SOpen-market sale Common Stock	-2,238	$929.29	$2.1M	168,011	Nov 28, 2025
Nov 26, 2025	SOpen-market sale Common Stock	-680	$930.48	$633k	167,331	Nov 28, 2025

Related signals

Other insiders at MONOLITHIC POWER SYSTEMS INC and this insider’s other filings.

Score	Company	Insider	Value	Holdings	Filed
30Weak	MPWRsell10b5-1 MONOLITHIC POWER SYSTEMS INC	Michael Hsing CEO	$40M 30,000 shares	-4%	14 d ago
36Weak	MPWRsell 2 MONOLITHIC POWER SYSTEMS INC	Robert W Dean II Interim CFO	$42k 32 shares	-0%	Aug 26, 2026
31Weak	MPWRsell 2 MONOLITHIC POWER SYSTEMS INC	Kuo Wei Herbert Chang director	$64k 50 shares	-9%	Aug 25, 2026
37Weak	MPWRsell 3 MONOLITHIC POWER SYSTEMS INC	Robert W Dean II Interim CFO	$8,482 6 shares	-0%	Aug 19, 2026
38Weak	MPWRsell 3 MONOLITHIC POWER SYSTEMS INC	Kuo Wei Herbert Chang director	$71k 50 shares	-8%	Aug 13, 2026
48Moderate	MPWRsell 3 MONOLITHIC POWER SYSTEMS INC	Robert W Dean II Interim CFO	$141k 105 shares	-1%	Aug 6, 2026
16Weak	MPWRsell 310b5-1 MONOLITHIC POWER SYSTEMS INC	Maurice Sciammas EVP, WW Sales & Marketing	$40k 30 shares	-3%	Aug 5, 2026
20Weak	MPWRsell10b5-1 MONOLITHIC POWER SYSTEMS INC	Maurice Sciammas EVP, WW Sales & Marketing	$20M 15,000 shares	-9%	Jul 17, 2026
1Weak	MPWRsell10b5-1 MONOLITHIC POWER SYSTEMS INC	Maurice Sciammas EVP, WW Sales & Marketing	$41k 30 shares	-3%	Jul 6, 2026
16Weak	MPWRsell 510b5-1 MONOLITHIC POWER SYSTEMS INC	Maurice Sciammas EVP, WW Sales & Marketing	$46k 30 shares	-2%	Jun 3, 2026

Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.