Unimicron Subsidiary Announces Disposal of Right-of-Use Assets in Kunshan

1. Name and nature of the underlying asset: Real estate located at No. 880, Yuyang Road, Yushan Town, Kunshan City (disposal of right-of-use assets by subsidiary Kunshan Dingshengxin Electronics). 2. Date of occurrence: April 24, 2026 3. Date of board resolution: April 24, 2026 4. Other approval date: Not applicable 5. Quantity, price per unit, and total transaction amount: Area: 20,927.68 square meters; Monthly rent: RMB 800,000 (excluding tax); Term: 227 months; Right-of-use asset value (discounted): RMB 138,796,472. 6. Counterparty and its relationship with the company: Kunshan Dingxin Electronics Co., Ltd.; parent company. 7. Reason for selecting related party: Both companies are parent-subsidiary and located near each other in Kunshan. 8. Where the asset owner in the last 5 years was a related party: Not applicable 9. Expected gain or loss from disposal: Monthly rental income of RMB 800,000; total discounted value of RMB 138,796,472. 10. Delivery or payment terms: RMB 800,000/month from May 1, 2026, to March 31, 2045; no restrictive clauses. 11. Method of determination, price reference, and decision-making unit: Negotiation based on appraisal report; approved by Board of Directors. 12. Name of professional appraiser and appraisal amount: Suzhou Zhongan Land & Real Estate Appraisal Co., Ltd.; annual rental value RMB 9,426,800. 13. Name of professional appraiser: Yuan Feng, Chen Shu 14. Appraiser license number: 3219980074, 3220040256 15. Whether the appraisal report is for limited, specific, or special price: No 16. Whether appraisal report is not yet obtained: No 17. Reason for not obtaining appraisal report: Not applicable 18. Accountant's opinion on differences: Not applicable 19. Name of accounting firm: Not applicable 20. Name of accountant: Not applicable 21. Accountant license number: Not applicable 22. Broker and broker fee: None 23. Concrete purpose or use of acquisition/disposal: To meet employee dormitory and living facility needs for Kunshan Dingxin Electronics. 24. Opinions of dissenting directors: None 25. Whether the transaction is a related party transaction: Yes 26. Date of Supervisor approval or Audit Committee agreement: Not applicable 27. Whether the transaction involves acquisition of real estate from related parties: No 28. Price evaluated according to Article 16: Not applicable 29. Price evaluated according to Article 17: Not applicable 30. Date of previous announcement: Not applicable 31. Other matters specified: None