MPWR Surges 2.88% on 192nd-Ranked Trading Volume Amid CEO Share Sale and Record Earnings

On August 18, 2025, Monolithic Power Systems (MPWR) rose 2.88% with a trading volume of $480 million, ranking 192nd in market activity. The stock’s performance followed a significant insider transaction involving its CEO and recent earnings report.

Michael Hsing, MPWR’s CEO, sold 17,631 shares for $16.77 million on August 15, with prices ranging between $825.69 and $836.40. Post-transaction, Hsing retained direct ownership of 814,667 shares, alongside indirect holdings through trusts. This move came amid the company’s Q2 2025 earnings release, which reported record revenue of $664.6 million—surpassing expectations—and an EPS of $4.21, exceeding forecasts by $0.10. Despite strong financial results, the stock dipped during regular trading but edged higher in after-hours sessions.

Analysts have not revised their ratings following the earnings update, reflecting cautious market sentiment. The company maintains a “GREAT” financial health score, with seven consecutive years of dividend growth. However, the stock’s post-earnings trajectory suggests mixed investor confidence, balancing robust fundamentals against recent volatility.

A backtest of a strategy buying the top 500 stocks by daily trading volume and holding for one day yielded a cumulative return of 23.4% from 2022 to the present, generating $2,340 in profit. This modest gain highlights the impact of market volatility and the strategy’s conservative approach.