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

Monolithic Power Systems' EVP and CFO, Theodore Blegen, sold 2,860 shares of common stock on January 2, 2026, through a pre-arranged 10b5-1 trading plan.

Summary

• Theodore Blegen, Executive Vice President and Chief Financial Officer of Monolithic Power Systems Inc (MPWR), reported sales of common stock.
• A total of 2,860 shares of common stock were sold on January 2, 2026.
• The sales were executed at weighted average prices ranging from $927.61 to $946.62 per share.
• These transactions were conducted pursuant to a Rule 10b5-1 trading plan adopted by Mr. Blegen on February 26, 2025.
• Following these transactions, Mr. Blegen directly owns 68,332 shares of common stock.
• Mr. Blegen also indirectly owns 5,331 shares each in an Irrevocable Trust FBO Sarah N. Blegen and an Irrevocable Trust FBO Theodore F. Blegen.

Sentiment

Score: 5

Explanation: The sale of shares by an executive, while executed under a pre-arranged 10b5-1 plan, represents a reduction in direct insider ownership. This is generally viewed neutrally to slightly negatively, as it's not a new discretionary sale based on current sentiment.

Negatives

• The EVP and CFO reduced his direct beneficial ownership by 2,860 shares of common stock.

Future Outlook

NA

Industry Context

NA

Stakeholder Impact

• Shareholders: A reduction in direct insider ownership, even if pre-planned, could be perceived as a slight negative, though the execution under a Rule 10b5-1 plan mitigates concerns about discretionary selling based on new information.

Key Dates

Recommendation

The reported insider sale by the EVP and CFO was executed under a pre-arranged Rule 10b5-1 trading plan, indicating it was not a discretionary sale based on recent material non-public information. While a reduction in insider ownership, the pre-planned nature suggests it is for personal financial management rather than a signal about the company's immediate prospects. Therefore, it does not significantly alter the investment thesis, warranting a 'hold' recommendation based solely on this filing.

Keywords

Monolithic Power Systems, MPWR, Insider Trading, Form 4, Stock Sale, Theodore Blegen, 10b5-1 Plan, Executive Compensation