[Yulon] IEC Technologies, S. de R.L. de C.V., Subsidiary in Mexico Region Announces Additional Payment for Self-Funded Construction Project

1. Type of Contract: Self-funded construction project 2. Event Date: June 30, 2026 ~ August 6, 2026 3. Board Approval Date: June 30, 2026 (Republic of China Year 115) 4. Other Approval Dates: Not applicable 5. Counterparty and Relationship with Company: Ace United Engineering Mexico S.A. DE C.V. and Zhengyuan Construction S.A. DE C.V. (unrelated parties) 6. Main Contract Contents (including total contract amount, expected investment amount, contract start and end dates, restrictive clauses, and other important terms): Additional construction cost of USD 71.7 million for the Juarez City, Mexico plant site; total budget increased to not exceed USD 111.7 million 7. Name of Professional Appraisal 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 construct production and warehouse facilities to meet future order demands 11. Dissenting Director’s Opinion on This Transaction: None 12. Is This Transaction a Related-Party Transaction? No 13. Date of Supervisor Approval or Audit Committee Consent: Not applicable 14. Is the Appraisal Report at a Limited Price, Specific Price, or Special Price? No or Not applicable 15. Has an Appraisal Report Not Yet Been Obtained? No or Not applicable 16. Reason for Not Yet 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 Accountant: Not applicable 20. License Number of Accountant: Not applicable 21. Previous Date of Material Information Disclosure on the Same Matter: June 30, 2026 (ROC Year 115) 22. Other Disclosures: This announcement supplements previously disclosed information regarding counterparties in the June 30, 2026 announcement.