[Zhen Ding-KY] Invited to Participate in the 2026 Q2 Industry Forum Hosted by Cathay Securities

Disclosure Clause Article 4, Paragraph XX: 12. Date of occurrence: 115/05/27. 1. Date of investor conference: 115/05/27. 2. Time: 09:30 AM. 3. Location: Grand Hyatt Taipei (No. 2, Songshou Rd, Xinyi Dist, Taipei City). 4. Summary: The company is invited to the 2026 Q2 Industry Forum hosted by Cathay Securities to explain the PCB industry outlook and operational performance. 5. Other matters: None. For complete financial and business information, please refer to the investor conference list on the Market Observation Post System.