Form 4: Monolithic Power CFO Sells Shares for Tax Obligations

Monolithic Power Systems' EVP and CFO, Theodore Blegen, disposed of 48,298 shares of common stock to cover tax liabilities related to vested restricted stock units.

Summary

• Theodore Blegen, Executive Vice President and Chief Financial Officer of Monolithic Power Systems Inc. (MPWR), reported a transaction on October 30, 2025.
• The transaction involved the disposition of 48,298 shares of common stock at a price of $1,096.63 per share.
• This disposition was a mandatory withholding by the company to satisfy income tax obligations.
• The tax obligations arose from the earnout and vesting of market-based restricted stock units (RSUs) that were granted in October 2022.
• Following this transaction, Mr. Blegen directly beneficially owns 77,332 shares of common stock.
• Additionally, 5,331 shares are indirectly owned through an Irrevocable Trust FBO Sarah N. Blegen, and another 5,331 shares through an Irrevocable Trust FBO Theodore F. Blegen.

Sentiment

Score: 5

Explanation: The filing is neutral as it reports a mandatory tax-related disposition of shares following RSU vesting, which is a routine event for executives.

Positives

• The underlying event, the vesting of market-based restricted stock units granted in October 2022, indicates successful achievement of performance criteria by the executive.

Negatives

• The disposition of 48,298 shares, while for tax purposes, reduces the executive's direct ownership in the company.

Future Outlook

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

Industry Context

This Form 4 filing is a routine disclosure of an insider transaction for tax purposes and does not provide information relevant to broader industry trends or competitive analysis.

Related Party Transactions

• Theodore Blegen indirectly beneficially owns 5,331 shares through an Irrevocable Trust FBO Sarah N. Blegen.
• Theodore Blegen indirectly beneficially owns 5,331 shares through an Irrevocable Trust FBO Theodore F. Blegen.

Stakeholder Impact

• Shareholders: The transaction is a routine tax-related disposition and is unlikely to have a significant impact on the company's share price or long-term value.
• Employees: No direct impact on employees is indicated by this filing.

Key Dates

Keywords

Monolithic Power Systems, MPWR, Theodore Blegen, Form 4, insider transaction, stock sale, tax withholding, restricted stock units, RSU