Form 4: Monolithic Power CEO Sells $36.2M in Shares

Monolithic Power Systems CEO Michael Hsing reported the sale of 37,840 shares of common stock on November 11, 2025, for approximately $36.2 million.

Summary

• Michael Hsing, CEO and Director of Monolithic Power Systems Inc. (MPWR), reported the sale of common stock.
• The transactions occurred on November 11, 2025, and were executed under a Rule 10b5-1(c) plan.
• A total of 37,840 shares of common stock were disposed of in multiple transactions.
• The sales were conducted at weighted average prices ranging from $951.69 to $967.15 per share.
• The total proceeds from these sales amount to approximately $36,238,327.19.
• Following these transactions, Michael Hsing directly beneficially owns 955,669 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: 5

Explanation: Neutral. A Form 4 filing reports an insider transaction and does not inherently convey positive or negative sentiment about the company's performance or prospects. The sale was executed under a 10b5-1 plan, indicating it was pre-scheduled.

Future Outlook

NA

Industry Context

NA

Related Party Transactions

• Michael Hsing indirectly beneficially owns 133,040 shares of Common Stock through the M Hsing 04 Trust.
• Michael Hsing indirectly beneficially owns 12,825 shares of Common Stock through the ZH Family 2020 Trust.

Stakeholder Impact

• Shareholders: Disclosure of significant insider selling by the CEO could be interpreted negatively by some investors, though sales under a Rule 10b5-1 plan are typically pre-planned and not necessarily indicative of a change in management's view of the company's future.

Key Dates

Recommendation

The filing reports a significant sale of common stock by the CEO, Michael Hsing, totaling 37,840 shares. While the transaction was executed under a Rule 10b5-1 plan, which suggests it was pre-scheduled and not necessarily a reaction to new information, a large insider sale by a key executive warrants attention. Investors should monitor future insider activity and company performance, but this single event, particularly given the 10b5-1 context, does not provide a strong enough signal for an immediate 'buy' or 'sell' recommendation. A 'hold' stance is appropriate to observe further developments.

Keywords

Monolithic Power Systems, MPWR, Insider Sale, Form 4, Michael Hsing, CEO, Stock Sale, Equity Transaction, Rule 10b5-1