ASE Technology: Subsidiary ASE Semiconductor announces acquisition of factory engineering from Kun Lin Engineering

1. Name and Nature of Subject Matter: Factory facility engineering for business use 2. Date of Occurrence: 2025/11/11 ~ 2026/04/21 3. Date of Board Resolution: Not applicable 4. Other Resolution Date: Approved by General Manager on 2026/04/21 5. Quantity, Unit Price, and Total Amount: One batch, Total Amount: TWD 319,084,000 (excluding tax) 6. Counterparty: Kun Lin Engineering Co., Ltd. (Relationship: None) 7. Related Party Transaction: No 10. Payment Terms: Wire transfer or Letter of Credit 11. Determination Method: Price comparison and negotiation 23. Purpose of Acquisition: For production and operational use 25. Related Party Transaction: No 30. Previous Disclosure: Not applicable 31. Other Matters: None