Monolithic Power Systems CEO Hsing sells $40.3m in stock

Monolithic Power Systems CEO Michael Hsing sold $40.3 million worth of company stock on September 28, 2026, following a pre-arranged Rule 10b5-1 trading plan. The sale, which consisted of multiple transactions across various prices, occurred as MPWR shares have risen 49% year-to-date, trading at $1,347. Despite the insider sale, the stock currently appears overvalued according to InvestingPro analysis, with a P/E ratio of 81.61 and being featured on the Most Overvalued stocks list.

However, Monolithic Power Systems has achieved notable financial milestones, reaching its prior annual revenue capacity target of $4 billion and setting new targets exceeding $6 billion, with a long-term goal of $8 billion. This development has led Stifel to reiterate a Buy rating on the stock and Truist Securities to raise its price target to $1,889.

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