Exhibit 99.1 PRESS RELEASE For Immediate Release Monolithic Power Systems Announces Results for the Second Quarter Ended June 30, 2025 KIRKLAND, WASHINGTON, July 31, 2025-- Monolithic Power Systems, Inc. ("MPS") (Nasdaq: MPWR), a fabless global company that provides high-performance, semiconductor-based power electronics solutions, today announced financial results for the quarter ended June 30, 2025. The financial results for the quarter ended June 30, 2025 were as follows: ● Revenue was $664.6 million for ...