2382 Quanta Announces Adjustment of Conversion Price for Fifth Offshore Unsecured Convertible Bonds

Announcement Date: August 4, 2026 Statement Date: August 3, 2026 Statement Time: 16:00:22 Company Code: 2382 Company Name: Quanta Subject: Public Announcement on Adjustment of Conversion Price for Fifth Offshore Unsecured Convertible Bonds Applicable Clause: Item 51 Factual Date: August 3, 2026

Details: 1. Factual Date: 8/3/2026 (ROC Year 115) 2. Company Name: Quanta 3. Relationship with Company (Please enter '本公司' or 'Subsidiary'):本公司 (Our Company) 4. Cross-shareholding Ratio: Not applicable 5. Reason for Occurrence: Adjusting the conversion price benchmark date due to cash capital increase issuing ordinary shares participating in the issuance of offshore depository receipts 6. Response Measures: Adjustment of conversion price for the fifth offshore unsecured convertible bonds: Effective from August 3, 2026, the conversion price will be adjusted from NT$383.98 to NT$380.15. (The USD to TWD exchange rate used in calculating the conversion price is 1:30.224) 7. Other Matters to be Disclosed (If the subject of the event or resolution is a publicly issued company or above, this material information also meets the criteria under Article 7, Paragraph 9 of the Enforcement Rules of the Securities and Exchange Act regarding matters having significant impact on shareholders' equity or security prices): None