Monolithic Power's 260th-Ranked $420M Trading Day Closes With 1.45% Drop as Insider Sells 4000 Shares Amid Record Earnings and Fair Value Debate

On September 2, 2025, Monolithic Power (MPWR) traded with a volume of $0.42 billion, ranking 260th in market activity. The stock closed down 1.45% for the session.

Director Eugen J. Elmiger executed six open-market sales of 4,000 shares on August 29, 2025, at weighted-average prices ranging from $844.00 to $849.41. Post-transaction, his beneficial ownership was reduced to 17,213 shares. The transactions, executed through an attorney-in-fact, were disclosed via SEC Form 4 and reflect standard liquidity management rather than strategic corporate actions. The price range suggests the sales occurred near the stock’s recent high, potentially signaling insider confidence in valuation or personal financial planning.

The trades occurred amid Monolithic’s Q2 2025 earnings report, which showed record revenue of $664.6 million and EPS of $4.21, surpassing estimates. Despite strong results, the stock declined during regular trading, though it saw a modest after-hours rebound. The insider activity adds to mixed signals for investors, balancing positive fundamentals against short-term volatility. Analysts note the stock currently trades near its calculated fair value, leaving room for both technical and fundamental interpretations.

Transaction details include: 800 shares at $844.25, 700 at $845.54, 700 at $846.66, 900 at $847.30, 100 at $848.03, and 800 at $849.41. Total proceeds amounted to $3,386,841. Post-sale holdings of 17,213 shares indicate reduced but still significant insider alignment with the company’s long-term performance.