2415 Chang Hsin to Participate in Uni Securities-Hosted Online Investor Briefing

Announcement Date: July 18, 2026 Statement Date: July 17, 2026 Statement Time: 14:47:28 Company Code: 2415 Company Name: Chang Hsin Purpose: Our company has been invited to participate in an online investor briefing hosted by Uni Securities. Applicable Clause: Clause 12 Factual Date: July 23, 2026 Details: Applicable under Article 4, Subsection XX, Clause: 12 Factual Date: 7/23/115 (July 23, 2026) 1. Date of Investor Briefing: 7/23/115 (July 23, 2026) 2. Time of Investor Briefing: 2:00 PM 3. Location of Investor Briefing: Online Investor Briefing 4. Summary of Investor Briefing: Presentation of the first quarter 2026 business operations overview during the online investor briefing hosted by Uni Securities 5. Other Disclosures: None For complete financial and business information, please visit the 'Investor Briefing Schedule' or 'Investor Presentation' section on Taiwan's Public Information Observation Station.