AU Optronics Announces Participation in Taishin Securities' Corporate Briefing Session

Pursuant to Clause 4, Item XX: 12

Factual Date: August 5, 2026

1. Date of Corporate Briefing Session: August 5, 2026 2. Time of Corporate Briefing Session: 3:30 PM 3. Location of Corporate Briefing Session: Online Corporate Briefing 4. Summary of Briefing: The company will participate in the corporate briefing session hosted by Taishin Securities, providing an overview of its business operations and financial status for the second quarter of 2026. 5. Other Disclosures: None

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