SARIA TSENG's Securities Transactions and Plan Adoption

The filing details the securities transactions of SARIA TSENG, an officer of MONOLITHIC POWER SYSTEMS, INC. The notice was filed on 10/16/2025, and the plan was adopted on 08/30/2024. TSENG acquired 1499 and 1313 Common shares on 02/03/2024 and 02/07/2024, respectively, as Performance Shares. In the past three months, TSENG sold 14028 Common shares on 10/15/2025 for $14,254,973.04 and 14510 Common shares on 09/18/2025 for $13,268,669.50. The aggregate market value of the securities sold is $2,884,322.27, and the total number of units outstanding is 47,892,000. The transactions were executed through Morgan Stanley Smith Barney LLC Executive Financial Services.