[Unimicron] Our Company Acquires Information Related to Plant Engineering

1. Name and nature of the subject matter (e.g., land in XX section, XX subsection, Beitun District, Taichung City): Plant Engineering 2. Date of occurrence of the event: 2025/5/14~2026/5/4 3. Date of board of directors' resolution: Not applicable 4. Other approval dates: Approval level: Chairman's approval May 4, 2026 (ROC calendar 115/5/4) 5. Quantity of transaction units (e.g., XX square meters, equivalent to XX pings), unit price, and total transaction amount: Quantity of transaction units: One batch; Total transaction amount: NTD 303,257,848 6. The counterparty to the transaction and its relationship with the company (if the counterparty is a natural person and not a related party of the company, their name may be omitted): XunJie Technology Co., Ltd.; Non-related party 7. If the counterparty is a related party, the reason for selecting the related party as the transaction counterparty, the owner of the previous transfer, the relationship between the owner of the previous transfer, the company and the counterparty, the date of the previous transfer, and the transfer amount shall also be disclosed: Not applicable 8. If the ownership of the transaction subject matter has been a related party of the company within the last five years, the acquisition and disposal dates, prices, and relationship with the company at the time of the transaction shall also be disclosed: Not applicable 9. Estimated disposal gain (or loss) (not applicable to asset acquisition) (for deferred cases, the recognition status should be listed and explained): Not applicable 10. Delivery or payment terms (including payment period and amount), contract restriction clauses, and other important agreements: Payment according to order terms, contract restriction clauses and other important agreements: None 11. Method of determining this transaction (e.g., tender, price comparison or negotiation), reference basis for price determination, and decision-making unit: Transaction determination 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 appraised amount: Not applicable 13. Name of professional appraiser: Not applicable 14. Professional appraiser's license number: Not applicable 15. Is the appraisal report 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 material difference in the appraisal results, the reason for the difference and the CPA's opinion: Not applicable 19. Name of CPA firm: Not applicable 20. Name of CPA: Not applicable 21. CPA's license number: Not applicable 22. Broker and brokerage fees: Not applicable 23. Specific purpose or use of acquisition or disposal: For production and operational use 24. Opinions of directors who expressed dissent 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-to-use assets from a related party: No 28. Price evaluated in accordance with Article 16 of the "Regulations Governing the Acquisition and Disposal of Assets by Public Companies": Not applicable 29. If the price evaluated in the preceding paragraph is lower than the transaction price, the price evaluated in accordance with Article 17 of the same regulations: Not applicable 30. Date of previous material information disclosure for the same event: Not applicable 31. Other explanatory matters: None