Form 4: Monolithic Power Systems EVP Sells Shares

Monolithic Power Systems' EVP & General Counsel, Saria Tseng, sold 19,920 shares of common stock on November 26, 2025, under a Rule 10b5-1 plan.

Summary

• Saria Tseng, Executive Vice President and General Counsel of Monolithic Power Systems Inc. (MPWR), reported the sale of common stock.
• A total of 19,920 shares of common stock were disposed of on November 26, 2025.
• The sales were executed at weighted average prices ranging from $922.78 to $930.48 per share.
• Following these transactions, Saria Tseng beneficially owns 167,331 shares of Monolithic Power Systems common stock.
• The transactions were made pursuant to a contract, instruction, or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Sentiment

Score: 5

Explanation: The sale of shares by an executive, while reducing insider ownership, was conducted under a pre-arranged Rule 10b5-1 plan, suggesting a scheduled liquidity event rather than a reaction to new company information. The high sale prices reflect a strong market valuation.

Positives

• The shares were sold at high prices, indicating a strong market valuation for Monolithic Power Systems stock at the time of the transactions.
• The transactions were conducted under a Rule 10b5-1 plan, suggesting a pre-scheduled liquidity event rather than a discretionary sale based on new, non-public information.

Negatives

• The sale of shares by an executive reduces the overall insider ownership percentage in the company.

Future Outlook

This Form 4 filing does not contain any forward-looking statements or guidance regarding the company's future performance or outlook.

Industry Context

This filing reports an individual executive's stock transaction and does not provide broader industry context or trends. Monolithic Power Systems operates in the semiconductor industry, specializing in high-performance, analog, and mixed-signal integrated circuits.

Stakeholder Impact

• Shareholders: The sale reduces the direct ownership stake of a key executive, which can sometimes be viewed as a slight reduction in alignment of interests, though mitigated by the 10b5-1 plan.

Key Dates

Keywords

Monolithic Power Systems, MPWR, Insider Trading, Form 4, Stock Sale, Saria Tseng, Executive Stock Sale, 10b5-1 Plan