4590 Tonda-Sou to Hold Corporate Briefing at VC Association Annual Meeting 'Taiwan Stock Exchange Special Session'

Disclosure Date: July 8, 2026 Statement Date: July 7, 2026 Statement Time: 13:44:47 Company Code: 4590 Company Name: Tonda-Sou

Subject: The company was invited to participate in the corporate briefing session at the 'Taiwan Stock Exchange Special Session' during the VC Association Annual Meeting.

Applicable Clause: Clause 12 Factual Date: July 8, 2026

Details: In accordance with Clause 4, Subsection XX, Item 12. Factual Date: July 8, 2026

1. Date of Corporate Briefing: July 8, 2026 2. Time of Corporate Briefing: 09:40 AM 3. Location of Corporate Briefing: 6th Floor, Taipei Cultural and Creative Park (No. 88, Yanchang Road, Xinyi District, Taipei City) 4. Summary of Corporate Briefing: The company was invited to the corporate briefing session at the 'Taiwan Stock Exchange Special Session' during the VC Association Annual Meeting, where it presented its operational performance and future outlook. 5. Other Matters to be Disclosed: None

For complete financial and business information, please refer to the corporate briefing schedule or the corporate presentation section on the Public Information Observation Station website.