[ASE Technology Holding] Announcement on behalf of subsidiary ASE Semiconductor regarding acquisition of machinery and equipment for operational use from KLA CORPORATION

1. Name and nature of underlying asset: Machinery and equipment for operational use. 2. Date of occurrence: 2026/02/09~2026/05/14. 3. Board resolution date: N/A. 4. Date of other approval: General Manager approval on May 14, 2026. 5. Transaction volume, unit price, and total amount: One batch, totaling TWD 1,081,422 thousand (tax excluded). 6. Counterparty: KLA CORPORATION (No relationship with the company). 10. Payment terms: Wire transfer or letter of credit. 11. Decision method: Price comparison and negotiation. 23. Purpose: For production and operational use.