[Winbond] The Company will hold its Q1 2026 institutional investor conference to explain the financial results and operational overview

Compliance with Article 4, Paragraph 12 Date of occurrence: 2026/05/05 1. Date of the institutional investor conference: 2026/05/05 2. Time of the institutional investor conference: 15:00 3. Location of the institutional investor conference: Orchid Room, 5F, Humble House Taipei, Curio Collection by Hilton (No. 18, Songgao Rd., Xinyi Dist., Taipei City) 4. Brief information of the institutional investor conference: The Company will hold its Q1 2026 institutional investor conference to explain the financial results and operational overview for the first quarter of 2026. 5. Any other matters that need to be specified: None. For complete financial and business information, please refer to the Institutional Investor Conference List or the Investor Conference section on the Market Observation Post System.