U.S. Semiconductor Executives Sell Company Shares Worth Billions

Maurice Sciammas, Senior Vice President of Sales and Marketing at Monolithic Power Systems, Inc. (NASDAQ: MPWR), sold 30,000 shares of the company’s common stock on May 4 under a 10b5-1 trading plan, generating approximately $47.7 million (roughly KRW 64 billion) in proceeds. He disclosed that he continues to hold a significant indirect stake through various family and trust accounts.

On May 6, Deming Xiao, Senior Vice President of Global Operations, sold about 29,000 shares in an open-market transaction, netting around $48 million (approximately KRW 65 billion). On the same day, reporting insider Eugen J. Elmiger disposed of roughly 12,000 shares, raising about $19.7 million (around KRW 26 billion). All three executives retained equity positions—either directly or via family and trust holdings—after their respective sales.

In its April 30 release of first-quarter fiscal 2026 results, Monolithic Power Systems reported record quarterly revenue of $804.2 million, surpassing both the prior-year period and the preceding quarter. The company also announced a favorable ruling in its patent litigation with Bel Power Solutions, with the court ordering the opposing party to bear the legal costs.

Meanwhile, on May 12, U.S. investor-rights law firm Rosen Law Firm issued a press release stating it has launched an investigation into potential breaches of fiduciary duty by the company’s directors and officers, underscoring emerging legal-risk concerns.

Monolithic Power Systems, founded in 1997 by analog semiconductor engineer Michael Hsing, is a NASDAQ-listed designer and seller of high-performance power-management semiconductors used in data centers, AI infrastructure, automotive systems and telecommunications equipment.