US Semiconductor Executives Sell Hundreds of Millions in Company Shares

On March 30 and April 1, Saria Tseng, Chief Legal Officer, and Maurice Sciammas, Senior Vice President of Sales at Monolithic Power Systems Inc. (MPWR), executed staged open-market sales of company shares under prearranged Rule 10b5-1 trading plans, raising approximately $60 million (around 80 billion KRW) in cash. Tseng sold about 27,000 shares at the end of March and an additional 1,400 on April 1, while Sciammas sold roughly 30,000 shares the same day. SEC filings show that both executives still hold hundreds of thousands of shares, either directly or indirectly.

The company’s stock recently broke above $1,200 at the end of February amid expectations that it will supply power modules for NVIDIA’s next-generation GPUs, and it has been trading near record highs since. On April 8, shares jumped about 8% intraday to a 52-week high near $1,290, reflecting heightened anticipation of AI-related benefits. In its fourth-quarter fiscal 2025 results, Monolithic Power Systems reported quarterly revenue of approximately $750 million—a record high—and earnings per share that slightly beat market estimates, confirming that growth remains driven by data-center and AI power-management solutions.

Headquartered in the United States, Monolithic Power Systems designs and supplies analog and mixed-signal power ICs used in cloud data centers, automotive applications, and industrial electronics. Its annual revenue has grown into the billions of dollars for more than a decade, and the company has rapidly expanded its presence in AI server and enterprise data-center markets, strengthening its role in the global power-semiconductor supply chain.