[jpp-KY] Announcement of Adjustment to Conversion Price of the Fifth Unsecured Convertible Bonds Issued in the Republic of China

1. Factual Event Date: 06/24/2026 (R.O.C. Year 115) 2. Company Name: Kingboard Precision Holdings Co., Ltd. 3. Relationship with Company (please enter本公司or Subsidiary):本公司 4. Cross-shareholding Ratio: Not applicable 5. Reason for Occurrence: In accordance with the issuance and conversion regulations of the fifth unsecured convertible bonds issued by the Company in the Republic of China, the conversion price shall be adjusted. 6. Response Measures: Due to the distribution of cash dividends, pursuant to Article 12 of the issuance and conversion regulations of the fifth unsecured convertible bonds issued in the Republic of China, the conversion price shall be adjusted. Therefore, effective from July 17, 2026, the conversion price of the fifth unsecured convertible bonds issued by the Company in the Republic of China will be adjusted from NT$322.6 to NT$318.5. 7. Other Matters to be Disclosed (If the subject of the event or resolution is a publicly issued company or above, this major information simultaneously meets the criteria under Article 7, Paragraph 9, Item 9 of the Enforcement Rules of the Securities and Exchange Act regarding matters having significant impact on shareholders' rights or securities prices): None Keyword: Major Information