[Winbond] Announcement regarding the purchase of machinery and equipment

1. Name and nature of the subject matter: Equipment for production use. 2. Date of occurrence: April 7, 2026 to May 21, 2026. 3. Date of Board approval: May 5, 2026. 4. Other resolution dates: Not applicable. 5. Transaction scale: A batch of machinery and equipment; cumulative transaction amount is 1,811,637,230 TWD. 6. Counterparty: Lam Research International Sdn. Bhd; Relationship with the company: None. 7-8. Related matters: Not applicable. 9. Profit/loss on disposal: Not applicable (acquisition of assets). 10. Payment terms: Payments based on order conditions. 11. Determination method: Negotiated and evaluated in accordance with the company's 'Procedures for Acquisition or Disposal of Assets'. 12-22. Valuation/Accounting: Not applicable. 23. Purpose: For production use. 24-30. Others: Not applicable. 31. Other remarks: This case was approved by the Board of Directors on February 10, 2026, and May 5, 2026.