[ASE Technology] Announcement of Facility Engineering Project by Subsidiary SPIL

1. Contract type: Facility engineering 2. Date of event: 2025/7/3 - 2026/5/27 3. Board approval date: N/A 4. Other approval: General Manager (2026/5/27) 5. Counterparty: Pengyi Co., Ltd. (No relationship) 6. Contract details: Total 947,156,827 TWD; Duration 2025/7/3 to 2028/12/31 7. Appraiser: N/A 8. Appraiser name: N/A 9. License number: N/A 10. Purpose: Production and operation 11. Director dissent: None 12. Related party transaction: No 13. Audit committee approval: N/A 14. Restricted price: No 15. Report not obtained: No 16. Reason: N/A 17. Variance: N/A 18. Accounting firm: N/A 19. Accountant name: N/A 20. License number: N/A 21. Previous disclosure: N/A 22. Other: None