[Winbond] Announcement on Ordering Equipment

1. Name and nature of the target: Equipment for business use. 2. Date of occurrence: Dec 23, 2026 - May 22, 2027 3. Date of board approval: May 5, 2026 4. Other resolution dates: Not applicable 5. Transaction quantity and price: A batch of equipment; cumulative transaction total amount is 1,232,511,620 TWD. 6. Counterparty and relationship: Advantest Corp.; relationship: None. 7. If counterparty is a related party: Not applicable 8. Ownership in the last 5 years: Not applicable 9. Expected profit: Not applicable 10. Payment terms: According to order conditions. 11. Decision method: Decided through negotiation and evaluation in accordance with company procedures. 12-22. Professional evaluation: Not applicable 23. Purpose of acquisition: For production use. 24-29. Nature of transaction: Not a related party transaction. 30. Previous announcements: Not applicable 31. Other remarks: Approved by board meetings on Feb 10 and May 5, 2026.