Monolithic Power Systems, Inc.

Monolithic Power Systems, Inc. (MPS) is a publicly traded American semiconductor company founded in 1997. Headquartered in West Palm Beach, Florida, the company trades on the Nasdaq under the ticker symbol MPWR. For the full year 2025, MPS reported revenue of $2.79 billion and had over 4,500 employees. The company operates on a fabless manufacturing model, designing and marketing its products while outsourcing fabrication.

MPS provides high-performance, semiconductor-based power electronics solutions. Its products include analog and mixed-signal integrated circuits (ICs) that convert, control, and monitor electrical power. Major product lines consist of DC-to-DC converters, AC-to-DC solutions, power management ICs, LED drivers, and motor drivers. These components are used in a wide variety of applications across the cloud computing, automotive, industrial, communications, and consumer electronics markets.

The company's patent litigation history consists entirely of defending its technology. Based on the provided case data, Monolithic Power Systems has been a defendant in all four tracked lawsuits and has not been a plaintiff. This posture is typical of an operating company targeted by patent assertion entities. All tracked suits were filed by Greenthread Ltd or Greenthread, LLC, entities that have been characterized as non-practicing entities (NPEs) and have also filed suits against other major technology companies like Intel, Dell, and Samsung.

The notable litigation involving MPS is a series of cases brought by Greenthread in the U.S. District Court for the District of Delaware, all concerning semiconductor patents. The initial district court case, filed in 2023, was stayed in April 2024 pending the outcome of inter partes review (IPR) proceedings that MPS initiated at the Patent Trial and Appeal Board (PTAB) to challenge the validity of the asserted patents. The subsequent listings in 2026 at the Court of Appeals for the Federal Circuit are appeals related to these proceedings.