Form 4: Monolithic Power Exec Sells Shares for Tax Obligations

Monolithic Power Systems' EVP & General Counsel, Saria Tseng, disposed of 54,543 shares of common stock to cover tax liabilities from RSU vesting.

Summary

• Saria Tseng, Executive Vice President & General Counsel of Monolithic Power Systems Inc. (MPWR), reported a transaction on October 30, 2025.
• The transaction involved the disposition of 54,543 shares of common stock at a price of $1,096.63 per share.
• This disposition was for tax withholding purposes, specifically to satisfy income tax obligations related to the earnout and vesting of market-based restricted stock units (RSUs) granted in October 2022.
• Following this transaction, Saria Tseng directly beneficially owns 207,331 shares of Monolithic Power Systems common stock.

Sentiment

Score: 5

Explanation: The transaction is a routine tax withholding event following the vesting of restricted stock units, which is a neutral event for the company's operational performance and does not indicate any new positive or negative developments.

Positives

• The transaction indicates the vesting of market-based restricted stock units (RSUs), suggesting the achievement of performance conditions or time-based vesting for the executive.

Negatives

• A significant number of shares (54,543) were disposed of, reducing the executive's direct beneficial ownership in the company.

Future Outlook

NA

Industry Context

This is a routine insider transaction for tax purposes and does not directly reflect broader industry trends or competitive dynamics.

Stakeholder Impact

• Minimal direct impact on shareholders as this is a routine tax-related transaction for executive compensation and does not reflect operational changes or strategic shifts.

Key Dates

Recommendation

This Form 4 reports a routine tax withholding transaction by an executive following the vesting of restricted stock units. It does not provide new information regarding the company's operational performance, financial health, or strategic direction that would warrant a change in investment recommendation.

Keywords

Monolithic Power Systems, MPWR, Form 4, Insider Transaction, Stock Sale, Tax Withholding, Restricted Stock Units, Saria Tseng, Executive Compensation