On September 10, Monolithic Power fell 3.05% in pre-market trading, trading at $1,165.02/share, with turnover of $712,600.

On the news front, the U.S. International Trade Commission disclosed that a company has filed a Section 337 investigation request concerning certain vertical power delivery systems and their components, naming Monolithic Power and its Chengdu and Shanghai subsidiaries as respondents. If the investigation proceeds, it could create potential uncertainty regarding market access for the company's related products in the United States.

The decline was compounded by a broad selloff across the semiconductor sector. Among major peers, Intel fell 4.04%, Micron Technology dropped 2.94%, Advanced Micro Devices declined 2.62%, Broadcom lost 1.75%, and NVIDIA slipped 1.39%.

Notably, just one day earlier, Monolithic Power announced a long-term manufacturing partnership with GlobalFoundries to deploy its process technology at a 300mm facility in Singapore, aimed at scaling high-performance power management solutions. The company also reported strong Q2 results in late July, with adjusted EPS of $6.50 beating the $5.87 consensus by over 10%, and revenue of $980.6 million surpassing the $903.3 million estimate, while guiding Q3 revenue to $1.14–$1.16 billion well above consensus.

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