[Unimicron] Participation in Citi's 2026 Taiwan Tech Conference

Compliance with Article 4, Paragraph XX: 12. Date of occurrence: 115/06/04. 1. Date of investor conference: 115/06/04. 2. Time of investor conference: 14:00. 3. Location of investor conference: W Taipei. 4. Summary of the conference: The company was invited to participate in the Citi's 2026 Taiwan Tech Conference hosted by Citi, where it provided explanations regarding the company's publicly released financial figures and operational performance. 5. Other matters: None. For complete financial and business information, please refer to the investor conference list or the investor conference section on the Market Observation Post System.