[ASE Holding] Subsidiary Taiwan Fullrose Electronics Announces Acquisition of Factory Engineering Services from Jiawang System Technology

1. Name and nature of the subject matter: Factory utility engineering for business use. 2. Date of occurrence: May 7, 2025 to April 21, 2026. 3. Date of board approval: Not applicable. 4. Other decision date: Approved by the General Manager on April 21, 2026. 5. Transaction volume, unit price, and total amount: Volume: One batch; Unit price: NT$666,922,000 (excluding tax); Total amount: NT$666,922,000 (excluding tax). 6. Counterparty and relationship: Jiawang System Technology Co., Ltd. Relationship: None. 7. Reasons for selecting a related party: Not applicable. 8. Previous owners who were related parties in the last 5 years: Not applicable. 9. Estimated gain or loss: Not applicable (acquisition of assets). 10. Delivery or payment terms: Wire transfer or letter of credit. Contract restrictions: None. Other important stipulations: None. 11. Determination method and decision-making unit: Determined by price comparison and negotiation. Decision-making unit: Handled according to company authority regulations. 12. Professional appraiser: Not applicable. 13. Name of appraiser: Not applicable. 14. Certificate number: Not applicable. 15. Limited/Specific/Special price: No or Not applicable. 16. Appraisal report pending: No or Not applicable. 17. Reason for pending appraisal: Not applicable. 18. Significant difference in appraisal: Not applicable. 19. Accounting firm: Not applicable. 20. Name of accountant: Not applicable. 21. Certificate number: Not applicable. 22. Broker and fees: None. 23. Specific purpose of acquisition: For production and operational use. 24. Dissenting opinions of directors: Not applicable. 25. Related party transaction: No. 26. Approval by supervisors or audit committee: Not applicable. 27. Acquisition of real estate from related party: No. 28. Valuation according to Article 16 of regulations: Not applicable. 29. Valuation according to Article 17 of regulations: Not applicable. 30. Date of previous announcement on same matter: Not applicable. 31. Other remarks: None.