Unimicron Acquires Machinery and Equipment Information

1. Name and nature of the underlying asset (e.g., land in XX section, XX sub-section, North District, Taichung City): Machinery and equipment. 2. Date of occurrence: 2026/2/3~2026/4/28. 3. Date of board resolution: Not applicable. 4. Other approval dates: Approval level: Chairman's approval. April 28, 2026. 5. Transaction quantity (e.g., XX square meters, equivalent to XX ping), unit price, and total transaction amount: Transaction quantity: One batch; Total transaction amount: TWD 1,162,505,857. 6. Counterparty and its relationship with the company (if the counterparty is a natural person and not a related party of the company, disclosure of their name may be omitted): ASMPT NEXX, INC.; not a related party. 7. If the counterparty is a related party, the reasons for selecting the related party as the transaction counterparty, the previous owner of the transferred asset, the relationship between the previous owner and the company and the counterparty, the previous transfer date, and the transfer amount should also be disclosed: Not applicable. 8. If the owner of the transaction subject within the last five years was a related party of the company, the acquisition and disposal dates, prices, and the relationship with the company at the time of the transaction should also be disclosed: Not applicable. 9. Estimated disposal profit (or loss) (not applicable for asset acquisition) (for deferred items, a table should be provided explaining the recognition status): Not applicable. 10. Delivery or payment terms (including payment period and amount), contractual restrictive clauses, and other important agreed matters: Payment terms based on order conditions; contractual restrictive clauses and other important agreed matters: None. 11. Decision-making method for this transaction (e.g., tender, price comparison, or negotiation), reference basis for price determination, and decision-making unit: Decision-making method: Negotiation. Reference basis for price determination: Market price. Decision-making unit: Approved by company procurement management regulations. 12. Name of professional appraiser's firm or company and its appraisal amount: Not applicable. 13. Name of professional appraiser: Not applicable. 14. Professional appraiser's practicing certificate number: Not applicable. 15. Is the appraisal report for a limited price, specific price, or special price: No or not applicable. 16. Has the appraisal report not yet been obtained: No or not applicable. 17. Reason for not yet obtaining the appraisal report: Not applicable. 18. If there is a significant difference in the appraisal results, the reasons for the difference and the accountant's opinion: Not applicable. 19. Name of accounting firm: Not applicable. 20. Name of accountant: Not applicable. 21. Accountant's practicing certificate number: Not applicable. 22. Broker and brokerage fees: Not applicable. 23. Specific purpose or use of the acquisition or disposal: For production use. 24. Opinions of directors who expressed dissenting opinions on this transaction: Not applicable. 25. Is this transaction a related party transaction: No. 26. Date of approval by supervisors or audit committee: Not applicable. 27. Is this transaction an acquisition of real estate or its right of use assets from a related party: No. 28. Price evaluated according to Article 16 of the "Regulations Governing the Acquisition or Disposal of Assets by Public Companies": Not applicable. 29. If the price evaluated according to the preceding paragraph is lower than the transaction price, the price evaluated according to Article 17 of the same regulations: Not applicable. 30. Date of previous material information release on the same event: Not applicable. 31. Other explanatory matters: None. Keyword: Material Information.