Wistron Subsidiary Announces Construction of Factory-Office Building in Kaohsiung via Land Lease and Commissioned Building Model

1. Type of Contract: Land Lease and Commissioned Construction 2. Date of Event: June 26, 2026 3. Board Approval Date: June 26, 2026 (Minguo Year 115) 4. Other Approval Dates: Not applicable 5. Counterparty and Relationship with the Company: Not yet determined 6. Main Contents of the Contract (including total contract value, expected investment amount, contract period, restrictive clauses, and other important terms): In response to practical requirements for building structure and high-end interior finishes, the budget will be increased by NT$23.11 billion, bringing the cumulative construction expenditure to NT$56.5 billion. 7. Name of Professional Appraisal Firm and Appraisal Results: Not applicable 8. Name of Real Estate Appraiser: Not applicable 9. License Number of Real Estate Appraiser: Not applicable 10. Specific Purpose of Acquisition: To meet business development and strategic planning needs 11. Dissenting Director Opinions on the Transaction: Not applicable 12. Is this a Related-Party Transaction? No 13. Date of Supervisor Approval or Audit Committee Consent: June 26, 2026 (Minguo Year 115) 14. Is the Appraisal Report a Limited, Specific, or Special Price? No or Not applicable 15. Has an Appraisal Report Not Been Obtained? No or Not applicable 16. Reason for Not Obtaining Appraisal Report: Not applicable 17. Reasons for Significant Differences in Appraisal Results and Auditor's Opinion: Not applicable 18. Name of Accounting Firm: Not applicable 19. Name of Auditor: Not applicable 20. Auditor's License Number: Not applicable 21. Previous Material Information Disclosure Date for the Same Event: This is an update to the announcement made on January 19, 2022 (Minguo Year 111) by the subsidiary Kaohsiung Jing-Jie-Da Optoelectronics Technology Co., Ltd. (abbreviated as KOE), regarding the plan to construct a factory-office building at the B3 site of the Cianjhen Technology Industrial Park via land lease and commissioned construction. 22. Other Disclosures: The counterparties for civil engineering and electrical/mechanical works were announced on June 16, 2023 (Minguo Year 112) and January 5, 2024 (Minguo Year 113), respectively.