[Quanta] Participating in Morgan Stanley Securities' Q2 2026 Operational Results Online Conference Call

Complies with Clause 4, Article XX: 12 Factual Date: 8/13/2026

1. Date of the Corporate Briefing: 8/13/2026 2. Time of the Corporate Briefing: 3:30 PM 3. Location of the Corporate Briefing: Online Conference Call 4. Summary of Briefing Information: Quanta has been invited by Morgan Stanley Securities to participate in the 'Q2 2026 Operational Results Online Conference Call.' 5. Other Disclosures: For detailed information, please refer to the Public Information Observation Station and the company's official website on the day of the event. Complete financial and business information can be found under the 'Corporate Briefing Schedule' or 'Earnings Call' section on the Public Information Observation Station.