Form 4: Monolithic Power CEO Sells Shares Under 10b5-1 Plan

Monolithic Power Systems CEO Michael Hsing sold 34,000 shares of common stock on February 10, 2026, as part of a pre-arranged Rule 10b5-1 trading plan.

Summary

• Michael Hsing, CEO and Director of Monolithic Power Systems Inc. (MPWR), sold a total of 34,000 shares of common stock on February 10, 2026.
• The sales were executed at weighted average prices ranging from $1,132.01 to $1,197.26 per share across multiple transactions.
• These transactions were conducted under a Rule 10b5-1 trading plan that Mr. Hsing adopted on August 28, 2025.
• Following these sales, Mr. Hsing directly beneficially owns 954,234 shares of common stock.
• Mr. Hsing also indirectly owns 133,040 shares through the M Hsing 04 Trust and 12,825 shares through the ZH Family 2020 Trust.

Sentiment

Score: 5

Explanation: StockSavvy.ai views this as a neutral event. While insider selling can be a negative signal, the execution under a pre-established 10b5-1 plan mitigates concerns about its implications for the company's immediate prospects.

Positives

• The sales were executed under a pre-arranged Rule 10b5-1 trading plan, indicating a planned divestment rather than a reaction to new, undisclosed negative information.

Negatives

• Insider selling, even under a 10b5-1 plan, represents a reduction in direct ownership by a key executive, which can sometimes be perceived negatively by investors.
• A significant number of shares (34,000) were sold, reducing the CEO's direct stake.

Future Outlook

NA

Industry Context

StockSavvy.ai notes that insider selling, even when pre-planned, is a common occurrence in the technology and semiconductor sectors, particularly for long-tenured executives managing their personal portfolios and liquidity. The semiconductor industry has seen significant growth, leading to substantial gains for executives, making such planned sales a routine part of wealth management.

Related Party Transactions

• Michael Hsing indirectly owns 133,040 shares through the M Hsing 04 Trust.
• Michael Hsing indirectly owns 12,825 shares through the ZH Family 2020 Trust.

Stakeholder Impact

• Shareholders: The sale of shares by the CEO could be perceived as a slight negative, but the 10b5-1 plan context generally reduces concerns about the company's future performance.

Key Dates

Recommendation

The insider selling, while significant in volume, was executed under a pre-arranged 10b5-1 plan, which typically signals a planned liquidity event rather than a reaction to new, adverse company information. This makes the event largely neutral for the stock's fundamental outlook. Investors should continue to hold based on broader company performance and industry trends, rather than interpreting this specific transaction as a strong buy or sell signal.

Keywords

Monolithic Power Systems, MPWR, Michael Hsing, Insider Trading, Form 4, Stock Sale, CEO, 10b5-1 Plan, Semiconductor, Power Management