Form 4: Monolithic Power Systems Exec Sells $3.5M in Stock

Maurice Sciammas, EVP of WW Sales & Marketing at Monolithic Power Systems, reported the sale of 3,976 shares of common stock for approximately $3.5 million.

Summary

• Maurice Sciammas, Executive Vice President of Worldwide Sales & Marketing for Monolithic Power Systems Inc. (MPWR), reported a transaction involving company common stock.
• On November 24, 2025, Mr. Sciammas sold 3,976 shares of common stock at a price of $895.23 per share.
• The total value of the shares sold amounts to approximately $3,559,000.48.
• This transaction was executed pursuant to a Rule 10b5-1 pre-arranged trading plan.
• Following the sale, Mr. Sciammas directly beneficially owns 144,330 shares of common stock.
• Additionally, Mr. Sciammas indirectly beneficially owns 96,030 shares through various trusts and accounts, including The Joseph Roger Sciammas 2020 Irrevocable Trust, Rosalind Sciammas Family 2021 Trust, Rosalind Sciammas Brokerage Account, Sciammas Family Trust, various Sciammas GRATs, The Patrick Francis Sciammas 2020 Irrevocable Trust, By Sciammas Trust 2020, Clement Sciammas Family 2021 Trust, Peter Rafferty and Eric Toothill 2021 Trust, The Chloe Liliane Sciammas 2020 Irrevocable Trust, and Clement Sciammas Trust.

Sentiment

Score: 5

Explanation: The sentiment is neutral. While insider selling can sometimes be perceived negatively, the explicit mention of a Rule 10b5-1 plan indicates the transaction was pre-scheduled and not a reaction to new, non-public information, thus mitigating potential negative interpretations.

Positives

• The transaction was made pursuant to a Rule 10b5-1(c) contract, instruction, or written plan, indicating the sale was pre-scheduled and not based on new, non-public information, which can mitigate negative market perception.

Negatives

• The sale by a high-level executive, even if pre-planned, reduces their direct ownership stake in the company, which some investors may interpret as a lack of conviction.

Future Outlook

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

Industry Context

This insider transaction report provides specific details about an executive's stock activity and does not directly offer insights into broader industry trends or competitive landscape within the semiconductor sector.

Related Party Transactions

• Mr. Sciammas holds a significant portion of his beneficial ownership indirectly through various family trusts and accounts, including The Joseph Roger Sciammas 2020 Irrevocable Trust, Rosalind Sciammas Family 2021 Trust, Sciammas Family Trust, various Sciammas GRATs, The Patrick Francis Sciammas 2020 Irrevocable Trust, By Sciammas Trust 2020, Clement Sciammas Family 2021 Trust, Peter Rafferty and Eric Toothill 2021 Trust, and The Chloe Liliane Sciammas 2020 Irrevocable Trust.

Stakeholder Impact

• Shareholders may observe the reduction in direct ownership by a key executive, which could lead to varied interpretations regarding management's long-term commitment or valuation perspective, despite the pre-planned nature of the sale.

Key Dates

Recommendation

The sale of shares by an executive, even if pre-planned under a 10b5-1 plan, is generally not a strong positive signal. However, the pre-scheduled nature prevents it from being a strong negative signal either, as it doesn't imply a lack of confidence based on new information. Therefore, a 'hold' recommendation is appropriate, suggesting no immediate change in investment thesis based solely on this transaction.

Keywords

Monolithic Power Systems, MPWR, Insider Trading, Form 4, Stock Sale, Executive Compensation, Maurice Sciammas, Semiconductor