Initial Statement of Beneficial Ownership

This filing reports the initial beneficial ownership of Po Hung Tsai, CFO of Silicon Motion Technology CORP. As of March 18, 2026, Mr. Tsai beneficially owns 46,350 American depositary shares indirectly through the Tsai Family Living Trust dated 10/09/2007, of which he and his spouse are co-trustees and beneficiaries. He disclaims beneficial ownership except to the extent of his pecuniary interest. Additionally, Mr. Tsai directly owns 1,900 American depositary shares. Each American depositary share represents four ordinary shares of the company.