Form 4: Monolithic Power Systems Insider Sells Shares

Saria Tseng, EVP & General Counsel of Monolithic Power Systems Inc., reported the sale of common stock totaling 1,014 shares on April 1, 2026, executed under a Rule 10b5-1 trading plan.

Summary

• Saria Tseng, Executive Vice President and General Counsel of Monolithic Power Systems Inc. (MPWR), has reported transactions involving the sale of company common stock.
• These sales occurred on April 1, 2026, and were executed as part of a pre-arranged Rule 10b5-1 trading plan adopted on November 28, 2025.
• A total of 1,014 shares were sold across multiple transactions, with weighted average sale prices ranging from $1,130.82 to $1,137.71.
• Following these transactions, Tseng directly beneficially owns 173,582 shares of common stock.
• An additional 1,000 shares are held indirectly through the C&T Discovery Foundation.

Sentiment

Score: 5

Explanation: StockSavvy.ai views this as a neutral filing, as the reported sales were conducted under a pre-established trading plan, indicating a structured approach to personal portfolio management rather than a reaction to adverse company news.

Negatives

• Insider selling activity, while executed under a pre-planned trading strategy, can sometimes be perceived negatively by the market.

Risks

• The Rule 10b5-1 trading plan is designed to provide an affirmative defense against allegations of insider trading, mitigating some risks associated with the sales.
• The specific reasons for the sales are not detailed, but such sales could be for personal financial diversification or liquidity needs.

Future Outlook

The filing does not contain forward-looking statements or guidance. It solely reports on past transactions.

Management Comments

• The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

Industry Context

StockSavvy.ai notes that insider selling, particularly when conducted under a Rule 10b5-1 plan, is a common occurrence in the semiconductor industry as executives manage their personal portfolios. The execution of these sales at prices above $1,130 per share reflects the current valuation of Monolithic Power Systems.

Corporate Governance

Stakeholder Impact

• Shareholders: The sales may lead to minor downward pressure on the stock price due to increased supply, though the Rule 10b5-1 plan mitigates concerns about negative insider sentiment.
• Employees: The transactions do not directly impact employee stock options or benefits but reflect executive compensation and portfolio management.
• Management: Demonstrates adherence to regulatory requirements for insider trading and personal financial planning.

Next Steps

• The reporting person may continue to execute transactions under the Rule 10b5-1 trading plan.
• The company may provide further information regarding specific sale prices upon request from regulatory bodies or security holders.

Key Dates

Keywords

Monolithic Power Systems, MPWR, Form 4, Insider Trading, Rule 10b5-1, Stock Sale, Beneficial Ownership, Saria Tseng, EVP General Counsel