Reed Semiconductor files patent suit against Monolithic Power Systems

Reed Semiconductor Corp. filed a patent infringement lawsuit against Monolithic Power Systems Inc. (NASDAQ: MPWR) in the U.S. District Court for the Western District of Texas, according to a company statement.

The lawsuit, filed as Case No. 6:25-cv-00449, alleges infringement of U.S. Patent No. 7,960,955, which covers power semiconductor devices incorporating a linear regulator to stabilize input voltage across multiple MPS product families.

Reed's filing follows previous lawsuits initiated by MPS in 2023, 2024, and 2025 in the U.S. District Court for the District of Delaware. Reed claims that discovery in those cases revealed the claims to be baseless and asserts that MPS engaged in bad-faith interference with Reed's business relationships and contractual agreements.

"While we would prefer to compete in the marketplace on the strength of our technologies, the evidence is clear that MPS has improperly profited from the misappropriation of others' intellectual property," said Wenkai Wu, Chief Executive Officer of Reed Semiconductor.

Reed Semiconductor, founded in 2019 in Rhode Island, develops semiconductor solutions for power management applications. The company focuses on technologies including Constant On-Time control, Smart Power Stage architecture, and DDR5 PMICs for AI and data center applications.

Morgan Lewis LLP represents Reed Semiconductor in the matter, according to the company statement.

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