3588 Tondachip to Participate in Online Investor Briefing Hosted by Kang Hwa Securities

Release Date: June 23, 2026 Statement Date: June 22, 2026 Statement Time: 14:00:27 Company Code: 3588 Company Name: Tondachip Subject: Announcement of Tondachip's participation in an online investor briefing hosted by Kang Hwa Securities Applicable Clause: Clause 12 Factual Date: June 23, 2026

Details: Applicable under Article 4, Clause XX: 12 Factual Date: June 23, 2026

1. Date of Investor Briefing: June 23, 2026 2. Time of Investor Briefing: 2:30 PM 3. Location of Investor Briefing: Online Investor Briefing (Webex Meeting) 4. Summary of Briefing: Tondachip has been invited to participate in an online investor briefing hosted by Kang Hwa Securities, during which the company will present information regarding its publicly disclosed financial figures and business performance. 5. Other Matters to be Disclosed: None

For complete financial and business information, please visit the 'Investor Briefings' section or 'Earnings Call' category on the Public Information Observation Station website.