[ASE Technology] Subsidiary ASE Advanced Semiconductor Announces Facility Engineering Project Contract

1. Name and nature of the object: Facility engineering project for business use. 2. Date of occurrence: 2026/04/15 ~ 2026/06/03. 3. Date of board approval: N/A. 4. Other authorization date: Authorized by General Manager, June 3, 2026. 5. Quantity, price, and total amount: One lot, total transaction amount of NT$300,209,000 (excluding tax). 6. Counterparty and relationship: Chang Ding Engineering Co., Ltd.; no relationship with the company. 7-9. Related party transactions and others: N/A. 10. Delivery or payment terms: Payment by wire transfer or letter of credit. 11. Determination method: Price comparison and negotiation. 12-22. Valuation and expert information: N/A. 23. Specific purpose: For production and operational use.