2303 UMC: Announcement regarding the acquisition of factory equipment

Announcement Date: May 27, 2026. Statement Date: May 26, 2026. Company Name: UMC. Subject: Announcement regarding the acquisition of factory equipment. Date of occurrence: May 26, 2026. Details: 1. Name of the asset: Factory equipment. 2. Date of occurrence: May 25-26, 2026. 3. Board approval: N/A. 4. Other approval: N/A. 5. Transaction volume: One batch. Total amount: NT$3,476,344,098. 6. Counterparty: L&K Engineering (Singapore branch), non-related party. 7. Related party details: N/A. 8. Ownership history: N/A. 9. Disposal gain/loss: N/A. 10. Payment terms: Based on order conditions. 11. Decision method: Negotiation. 12-22. Professional appraisal: N/A. 23. Purpose: For production use. 24-31. Other: N/A.