Form 4: Monolithic Power CEO Awarded 302,920 Shares

Monolithic Power Systems CEO Michael Hsing received 302,920 shares of common stock following the vesting of market-based restricted stock units.

Summary

• Michael Hsing, CEO and Director of Monolithic Power Systems Inc. (MPWR), acquired 302,920 shares of common stock.
• The acquisition occurred on October 25, 2025, at an acquisition price of $0, as a result of the vesting of market-based restricted stock units (MSUs).
• These MSUs were originally granted on October 25, 2022, subject to the achievement of five stock price targets and relative total stockholder return percentile rank over a three-year performance and vesting period.
• The Company's Compensation Committee of the Board of Directors certified and approved the achievement of the performance criteria for the MSUs on October 25, 2025.
• All 302,920 shares fully vested on October 25, 2025, according to the grant agreement.
• Following this transaction, Michael Hsing directly beneficially owns 1,117,587 shares of common stock.
• Additionally, Michael Hsing indirectly beneficially owns 133,040 shares through the M Hsing 04 Trust and 12,825 shares through the ZH Family 2020 Trust.

Sentiment

Score: 7

Explanation: The successful vesting of a significant equity grant to the CEO indicates the achievement of performance targets and aligns management's interests with shareholders, which is generally a positive signal.

Positives

• The successful vesting of a significant equity grant to the CEO indicates the achievement of pre-defined performance criteria, including stock price targets and relative total stockholder return.
• The increased direct beneficial ownership by the CEO aligns management's interests more closely with those of shareholders.

Future Outlook

This filing reports a past transaction and does not contain forward-looking statements or guidance regarding the company's future performance.

Industry Context

This report details a routine insider compensation event, which is common across publicly traded companies as a mechanism for executive incentive and retention. It does not provide broader industry trends or competitive insights.

Corporate Governance

Stakeholder Impact

• Shareholders: The increased direct ownership by the CEO enhances alignment between management and shareholder interests, potentially signaling confidence in the company's future performance.
• Employees: The successful vesting of performance-based awards can serve as a positive example of the company's commitment to rewarding achievement, potentially boosting morale and retention.

Key Dates

Recommendation

The filing reports a routine vesting of market-based restricted stock units for the CEO, indicating successful achievement of performance targets. While positive for management alignment and reflecting past performance, it does not present new fundamental information to warrant a change in investment recommendation based solely on this report. The event was largely anticipated given the nature of MSU grants.

Keywords

Monolithic Power Systems, MPWR, Michael Hsing, SEC Form 4, Restricted Stock Units, CEO Compensation, Insider Ownership, Equity Grant, Stock Vesting