Tseng Saria sold ~$142M in Monolithic Power Systems, Inc. stock
Monolithic Power Systems, Inc. (MPWR) · Data via SEC EDGAR Form 4
Price Performance · 10 days before → 90 days after trade
▲ = insider buy date
Trade Details · Public SEC Filing
Insider
Tseng Saria
Role
—
Transaction
Open-Market Sale
Approx. Value
~$142M
Trade Date
Nov 26, 2025
Company
Monolithic Power Systems, Inc.
Ticker
MPWRSource
SEC EDGAR Form 4
Why This Trade Stands Out
Strong conviction signal
Scored above average across multiple factors. Roughly 15% of insider trades qualify as Strong.
~$142M sale
Trades over $1M are rare. When insiders put this much of their own money on the line, they tend to have high conviction in their company's direction.
3 insiders traded in the same window
When multiple insiders independently buy within 30 days, it's called a cluster. Studies show clustered insider purchases outperform solo trades significantly, because several people with inside knowledge are reaching the same conclusion.
How good is Tseng Saria at picking stocks?
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Tseng Saria wasn't the only one selling.
3 insiders at Monolithic Power Systems, Inc. traded within the same 30-day window.
See who else bought · FreeOn November 26, 2025, Tseng Saria — a corporate insider at Monolithic Power Systems, Inc. — filed a Form 4 with the SEC disclosing an open-market sale of approximately ~$142M in Monolithic Power Systems, Inc. (MPWR) stock.
This transaction was part of a cluster — 3 insiders at Monolithic Power Systems, Inc. made open-market sales within the same 30-day window. Cluster activity from multiple independent insiders is one of the most studied patterns in insider trading research.
Under Section 16(a) of the Securities Exchange Act of 1934, corporate insiders must report all open-market stock transactions to the SEC within two business days. These filings — known as Form 4s — are publicly available on the SEC's EDGAR database. VeritySignals filters and scores the full Form 4 stream to surface high-conviction signals like this one.
VeritySignals Conviction Analysis
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All data sourced from publicly available SEC Form 4 filings via EDGAR · Not financial advice · Past performance does not guarantee future results.
At a Glance
More MPWR Insider Activity
Tseng Saria
May 27, 2026
~$27M
STRONG
Hsing Michael
May 22, 2026
~$134M
STRONG
Xiao Deming
May 18, 2026
~$263M
STRONG
Xiao Deming
May 6, 2026
~$144M
STRONG
How to Read Insider Trades
What is this?
When company executives buy or sell their own stock, they must report it to the SEC within 2 days. These public filings reveal what the people who know the company best are doing with their own money.
Why does it matter?
Insiders can sell for many reasons (taxes, diversification, expenses), but they generally only buy for one: they think the stock is going up. That's why insider purchases are more predictive than sales.
What makes a trade "strong"?
We score trades on 15+ factors: the insider's role (CEO > director), trade size relative to their salary, whether other insiders also bought (clusters), and historical accuracy of the insider.
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