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

Monolithic Power Systems' EVP and CFO, Theodore Blegen, sold 3,070 shares of common stock on November 3, 2025, under a pre-arranged 10b5-1 trading plan.

Summary

• Theodore Blegen, EVP and CFO of Monolithic Power Systems Inc. (MPWR), reported the sale of 3,070 shares of common stock.
• The sales occurred on November 3, 2025, at weighted average prices ranging from $1,013.62 to $1,038.41 per share.
• These transactions were executed pursuant to a Rule 10b5-1 trading plan adopted by Mr. Blegen on February 26, 2025.
• Following these sales, Mr. Blegen directly beneficially owns 74,332 shares of common stock.
• He also indirectly beneficially owns 5,331 shares in an Irrevocable Trust FBO Sarah N. Blegen and 5,331 shares in an Irrevocable Trust FBO Theodore F. Blegen, which were not affected by these transactions.

Sentiment

Score: 5

Explanation: The sentiment is neutral. While insider selling can be a negative signal, the execution under a pre-arranged 10b5-1 plan mitigates concerns that the sale is based on new, negative material information. It's a planned liquidity event.

Positives

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

Negatives

• An executive selling a significant number of shares, even under a 10b5-1 plan, can be perceived as a slight negative signal regarding future growth prospects or valuation by some investors.

Future Outlook

NA

Industry Context

This is a routine insider transaction filing for a semiconductor company. Such filings are common across all industries and do not inherently reflect broader industry trends unless the volume or nature of insider activity is unusual across multiple companies.

Related Party Transactions

• Theodore Blegen indirectly beneficially owns shares held in Irrevocable Trusts FBO Sarah N. Blegen and Theodore F. Blegen, which are considered related party holdings.

Stakeholder Impact

• Shareholders may interpret the executive's sale as a slight negative signal, though the 10b5-1 plan reduces the severity of this interpretation.
• No direct impact on employees, customers, suppliers, or creditors is indicated by this filing.

Key Dates

Recommendation

The insider selling, while notable, was conducted under a pre-arranged 10b5-1 plan, which suggests it's a planned liquidity event rather than a reaction to new, adverse company developments. This reduces the immediate negative signal. Without additional financial or operational context, this filing alone does not warrant a change from a 'hold' position, as it's a routine disclosure of a planned transaction.

Keywords

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