[Radiant Opto-Electronic] Announcement of Corporate Information Session

Subject to Article IV, Paragraph XX: 12 Date of Fact Occurrence: 2026/04/24 1. Date of Corporate Information Session: 2026/04/24 2. Time of Corporate Information Session: 14:15 3. Location of Corporate Information Session: Emerald and Pearl Halls, 3rd Floor, Le Méridien Taipei (3F, No. 38, Songren Rd., Xinyi Dist., Taipei City) 4. Key Information from Corporate Information Session: Q1 2026 operational results and company future outlook. 5. Other matters to be noted: None.

For complete financial and business information, please refer to the list of corporate information sessions or the session items on the Market Observation Post System.