Form 4: MPWR Exec Sells Shares for Tax Obligations

Monolithic Power Systems EVP Deming Xiao disposed of 54,543 shares of common stock to cover tax liabilities from RSU vesting.

Summary

• Deming Xiao, EVP, Global Operations at Monolithic Power Systems Inc. (MPWR), reported a disposal of common stock.
• The transaction occurred on October 30, 2025.
• A total of 54,543 shares of common stock were disposed of at a price of $1,096.63 per share.
• The total value of shares disposed for tax purposes amounts to approximately $59,850,000.09.
• This disposal was made 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, Deming Xiao directly beneficially owns 201,637 shares of common stock.
• Indirect beneficial ownership includes 20,455 shares by spouse and 4,336 shares by the Christopher Chao Xiao Trust.

Sentiment

Score: 5

Explanation: The transaction is a mandatory tax withholding event related to RSU vesting, which is a neutral event and does not reflect a voluntary investment decision by the executive.

Stakeholder Impact

• Minimal impact on shareholders as this is a routine, non-discretionary transaction for tax purposes related to executive compensation.

Key Dates

Recommendation

This Form 4 reports a routine, non-discretionary disposal of shares by an executive to cover tax obligations arising from the vesting of restricted stock units. Such transactions are common and do not typically signal a change in the company's fundamentals or the executive's confidence in the company. Therefore, it does not warrant a change in investment recommendation based solely on this filing.

Keywords

Monolithic Power Systems, MPWR, Deming Xiao, Insider Transaction, Form 4, Stock Sale, RSU Vesting, Tax Withholding, Executive Compensation