Monolithic Power Systems (MPWR) shares closed at $1550.02 on May 15, 2026. The stock declined 3.96% during the regular session. After-hours trading prices currently sit near $1548.99. The stock faced a volatile week, including a 3.71% drop on May 12 and a 2.20% slide on May 14.
No company-specific news or guidance updates were released during this period. The downward move aligns with a broader technology sector retreat following a disappointing U.S.–China trade summit. Negotiators failed to resolve semiconductor export restrictions during the meeting. Reports that China blocked certain Nvidia chip imports further pressured the sector. Traders should monitor macro headlines before markets reopen on May 18, 2026.