【Advantech】Supplemental Announcement Regarding Taoyuan Factory Construction - Electromechanical and Fire Protection Engineering Contract Awarded

1. Type of contract: Build on own land by entrusted construction 2. Date of occurrence: 2026/5/4~2026/5/4 3. Date approved by the board of directors: Not applicable 4. Other approval dates: Approval level: Chairman's approval May 4, 2026 (ROC 115th year) 5. Counterparty to the contract and its relationship with the company: Chen Quan Electromechanical Engineering Co., Ltd. / Non-related party 6. Main contents of the contract (including total contract amount, estimated amount to be invested, and contract start and end dates), restrictive clauses, and other important agreed matters: Total contract price for electromechanical and fire protection engineering: NT$268,000 thousand (including tax) 7. Name of professional appraiser's firm or company and its appraisal result: Not applicable 8. Name of real estate appraiser: Not applicable 9. Real estate appraiser's professional certificate number: Not applicable 10. Specific purpose of acquisition: Operational needs 11. Opinions of directors who dissented from this transaction: None 12. This transaction is a related party transaction: No 13. Date of approval by supervisors or audit committee: Not applicable. 14. Is the appraisal report a limited price, specific price, or special price: No or not applicable 15. Is the appraisal report not yet obtained: No or not applicable 16. Reasons for not yet obtaining the appraisal report: Not applicable 17. If there is a significant discrepancy in the appraisal result, the reason for the discrepancy and the accountant's opinion: Not applicable 18. Name of accounting firm: Not applicable 19. Name of accountant: Not applicable 20. Accountant's professional certificate number: Not applicable 21. Date of previous significant announcement on the same event: February 10, 2026 and March 23, 2026 22. Other matters to be specified: On February 10, 2026, the board of directors resolved that the total budget for the Taoyuan factory's entrusted construction project was NT$1.66 billion; On March 23, 2026, supplemental information was provided regarding the construction engineering contractor and amount; This supplemental information specifies the electromechanical and fire protection engineering contractor and amount.