MONOLITHIC POWER SYSTEMS INC

We are a party to actions and proceedings in the ordinary course of business, including challenges to the enforceability or validity of our intellectual property, claims that our products infringe on the intellectual property rights of others, and employment matters. We may also be subject to litigation initiated by our stockholders. These proceedings often involve complex questions of fact and law and* may require the expenditure of significant funds and the diversion of other resources to prosecute and defend. We defend ourselves vigorously against any such claims. As of December 31, 2024,* there were no material pending legal proceedings to which we were a party.

On February 4, 2025, a purported class action lawsuit was filed against us and certain of our executives. The lawsuit is captionedWaterford Twp. Gen. Emps. Ret. Sys. v. Monolithic Power Systems, Inc., et al., No. 25-cv-220 (W.D. Wash.), and alleges that we violated Sections 10(b) and 20(a) of the Securities Exchange Act of 1934, as amended, and Rule 10b-5 promulgated thereunder, by making material misstatements or omissions relating to our business, including with respect to our business relationship with Nvidia. The lawsuit seeks an unspecified amount of damages as well as attorneys’ fees and other relief. We believe the lawsuit is meritless and intend to defend against it vigorously.