Unimicron Announces Acquisition of Factory Engineering Services Data

1. Name and nature of the target object (if it is preferred stock, specify the agreed issuance conditions, such as dividend rate, etc.): Factory engineering 2. Date of fact occurrence: 2026/01/15 ~ 2026/04/15 3. Date of board of directors' approval: Not applicable 4. Date of other approval: Approval level: Chairman's approval April 15, 2026 5. Transaction unit quantity (e.g., XX square meters, equivalent to XX ping), price per unit, and total transaction amount: Transaction unit quantity: One batch; Total transaction amount: NT$613,100,000 6. Transaction counterparty and relationship with the company (if the counterparty is a natural person and not a related party, their name may be omitted): Liewei Technology Engineering Co., Ltd.; Not a related party 7. If the transaction counterparty is a related party, also announce the reason for selecting the related party as the transaction object and the owner of the previous transfer, the relationship between the owner of the previous transfer, the company, and the transaction counterparty, the date of the previous transfer, and the transfer amount: Not applicable 8. If the owner of the subject of the transaction has been a related party of the company within the last five years, the date and price of acquisition and disposal by the related party, and the relationship with the company at the time of the transaction should also be announced: Not applicable 9. Estimated profit (or loss) from disposal (not applicable for asset acquisition) (if deferred, explain the recognition status in a table): Not applicable 10. Delivery or payment terms (including payment period and amount), contract restrictions, and other important agreed matters: Payment according to order terms; Contract restrictions and other important agreed matters: None 11. Method of decision for this transaction (e.g., bidding, price comparison, or negotiation), reference basis for price determination, and decision-making unit: Transaction decision method: Negotiation Reference basis for price determination: According to market prices Decision-making unit: Approved and decided according to the company's procurement management regulations 12. Name of professional appraisal firm or company and its appraisal amount: Not applicable 13. Name of professional appraiser: Not applicable 14. Professional appraiser's license number: Not applicable 15. Whether the appraisal report is a limited price, specific price, or special price: No or not applicable 16. Whether an appraisal report has not yet been obtained: No or not applicable 17. Reason for not obtaining an appraisal report: Not applicable 18. If there is a significant difference in the appraisal results, the reason for the difference and the opinion of the accountant: Not applicable 19. Name of accounting firm: Not applicable 20. Name of accountant: Not applicable 21. Accountant's license number: Not applicable 22. Broker and brokerage fee: Not applicable 23. Specific purpose or use of acquisition or disposal: For production and operational use 24. Opinions of dissenting directors regarding this transaction: Not applicable 25. Is this transaction a related party transaction: No 26. Date of supervisor's approval or audit committee's consent: Not applicable 27. Did this transaction involve the acquisition of real estate or its usage rights from a related party: No 28. According to Article 16 of the "Regulations Governing the Acquisition or Disposal of Assets by Publicly Offered Companies", the appraised price: Not applicable 29. If the appraised price in the preceding paragraph is lower than the transaction price, the appraised price according to Article 17 of the same regulations: Not applicable 30. Date of previous announcement of material information on the same matter: Not applicable 31. Other matters to be noted: None