[Inventec] (Supplement to Announcement Dated 115/03/10) Board Approves Mexican Subsidiary IEC Technologies, S. de R.L. de C.V. to Construct Factory Locally to Meet Operational Needs

1. Type of Contract: Turnkey construction project 2. Event Date: 115/3/10 ~ 115/8/6 3. Board Approval Date: March 10, 2026 (ROC Year 115) 4. Other Approval Dates: Not applicable 5. Counterparty and Relationship to Company: Ace United Engineering Mexico S.A. de C.V. and Zhengyuan Construction S.A. de C.V. (non-related parties) 6. Main Contract Contents (including total contract amount, estimated investment amount, contract start and end dates), restrictive clauses, and other important terms: The total factory budget shall not exceed USD 40 million 7. Name of Professional Appraiser Firm or Company and Appraisal Result: 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 improve material logistics management efficiency and retain production scalability flexibility for future order demands 11. Dissenting Director Opinions on This Transaction: None 12. Is This a Related-Party Transaction? No 13. Supervisor Approval or Audit Committee Consent Date: Not applicable 14. Is the Appraisal Report 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. Reasons for Significant Differences in Appraisal Results and Auditor's Opinion: Not applicable 18. Name of Accounting Firm: Not applicable 19. Name of Accountant: Not applicable 20. License Number of Accountant: Not applicable 21. Previous Date of Material Information Disclosure on the Same Event: March 10, 2026 (ROC Year 115) 22. Other Disclosures: This announcement supplements information regarding counterparties disclosed in the March 10, 2026 announcement.