Unimicron: The Company Obtains Relevant Information on Plant Engineering

1. Name and nature of the subject matter (e.g., land in XX section, XX subsection, North District, Taichung City): Plant engineering. 2. Date of Occurrence: 2025/4/14~2026/4/8. 3. Board of Directors Approval Date: Not applicable. 4. Other Approval Date: Approval Level: Chairman's approval. April 8, 2026. 5. Transaction unit quantity (e.g., XX square meters, equivalent to XX ping), unit price, and total transaction amount: Transaction unit quantity: one batch; Total transaction amount: NT$302,661,458. 6. Counterparty 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): Jia Hong Environmental Protection Co., Ltd.; Not a related party. 7. If the counterparty is a related party, the reason for selecting the related party as the transaction object, the previous owner, the relationship between the previous owner and the company and the counterparty, the previous transfer date, and the transfer amount should also be announced: Not applicable. 8. If the owner of the transaction target has been a related party of the company within the past five years, the related party's acquisition and disposal dates, prices, and relationship with the company at the time of the transaction should also be announced: Not applicable. 9. Estimated disposal profit (or loss) (not applicable for asset acquisition) (deferred items should be listed and explained): Not applicable. 10. Delivery or payment terms (including payment period and amount), contract restrictive clauses, and other important agreements: Payment according to order terms, no contract restrictive clauses or other important agreements. 11. Method of determining this transaction (e.g., bidding, 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 according to the company's procurement management regulations. 12. Name of professional appraiser's office or company and its appraisal amount: Not applicable. 13. Professional appraiser's name: 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 significant difference in the appraisal results, the reason for the difference and the accountant's opinion: Not applicable. 19. Name of accounting firm: Not applicable. 20. Accountant's name: Not applicable. 21. Accountant's license number: Not applicable. 22. Broker and brokerage fees: Not applicable. 23. Specific purpose or use of acquisition or disposal: For production and operation. 24. Opinions of directors who dissented from this transaction: Not applicable. 25. This transaction is a related party transaction: No. 26. Date of supervisor's approval or audit committee's consent: Not applicable. 27. This transaction is 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 in the preceding item is lower than the transaction price, the price evaluated according to Article 17 of the same regulations: Not applicable. 30. Date of previous major announcement regarding the same event: Not applicable. 31. Other matters to be stated: None. Keywords: Major Announcement