【Mingxuan】(Supplement to 2025/4/18 announcement) Announcement of the Board of Directors' resolution to sign a construction engineering contract with a related party.

1. Type of contract: Engineering contract 2. Date of occurrence of the event: 2026/4/14~2026/4/14 3. Date of board resolution: April 14, 2026 4. Other approval dates: Not applicable 5. Counterparty to the contract and its relationship with the company: Zhongfu Construction Co., Ltd., a substantial related party of the company. 6. Main content of the contract (including total contract amount, estimated investment amount, and contract start/end dates), restrictive clauses, and other important agreements: Authorization to sign construction engineering contracts with Zhongfu Construction Co., Ltd. for the following construction projects and within the transaction amount: Plot 158, Zhongxing Section, Xiangshan District, Hsinchu City, transaction amount NTD 8,076,480 thousand. Contract start and end dates: Not yet formally signed. Restrictive clauses and other important agreements: None. 7. Name of professional appraiser firm or company and its appraisal results: Not applicable 8. Name of real estate appraiser: Not applicable 9. Real estate appraiser's license number: Not applicable 10. Specific purpose of acquisition: To outsource construction engineering contracts for operational needs. 11. Opinions of directors who expressed dissent on this transaction: None 12. This transaction is a related party transaction: Yes 13. Date of approval by supervisors or audit committee: April 14, 2026 14. Is the appraisal report for a limited price, specific price, or special price: No or not applicable 15. Has the appraisal report not yet been obtained: No or not applicable 16. Reason for not yet obtaining the appraisal report: Not applicable 17. If there is a significant difference in the appraisal results, the reason for the difference and the accountant's opinion: Not applicable 18. Name of accounting firm: Not applicable 19. Name of accountant: Not applicable 20. Accountant's license number: Not applicable 21. Date of previous material information announcement for the same event: April 18, 2025 22. Other matters to be specified: 1. The company's shareholders' meeting on June 19, 2025, resolved to authorize an amount of NTD 8,100,000 thousand within one year to sign construction engineering contracts with related parties. The executed contract amount is NTD 23,520 thousand (announced on August 8, 2025). 2. This case was approved by the Board of Directors and will be submitted to the 2026 shareholders' meeting for discussion.