Unimicron Acquires Factory Engineering-Related Data

1. Name and nature of the subject matter (e.g., land located in Section XX, Subsection XX, North District, Taichung City): Factory Engineering

2. Date of occurrence: 08/14/2025 ~ 07/31/2026

3. Board approval date: Not applicable

4. Other approval dates: Approval level: Approved by Chairman July 31, 2026 (ROC Year 115)

5. Quantity of transaction units (e.g., XX square meters, equivalent to XX ping), unit price, and total transaction amount: Quantity: One batch; Total transaction amount: TWD 304,097,622

6. Counterparty and its relationship with the company (if the counterparty is a natural person and not a related party of the company, name disclosure may be omitted): Cheng Teh Fire Protection Co., Ltd.; Unrelated party

7. If the counterparty is a related party, disclose the reason for selecting the related party as the transaction party, the previous transferor, the relationship among the previous transferor, the company, and the counterparty, the previous transfer date, and the transfer amount: Not applicable

8. If the ownership of the subject matter was held by a related party of the company within the past five years, disclose the date of acquisition and disposal by the related party, price, and the relationship with the company at the time of transaction: Not applicable

9. Estimated gain (or loss) on disposal (not applicable for asset acquisition) (if deferred, list and explain recognition): Not applicable

10. Delivery or payment terms (including payment period and amount), contractual restrictions, and other important agreements: Payment according to purchase order terms; Contractual restrictions and other important agreements: None

11. Decision method for this transaction (e.g., bidding, price comparison, negotiation), reference basis for price determination, and decision-making unit: Transaction decision method: Negotiation Reference basis for price determination: Market conditions Decision-making unit: Approved in accordance with company procurement management regulations

12. Name of professional appraiser firm or company and appraisal amount: Not applicable

13. Name of professional appraiser: Not applicable

14. Professional appraiser license number: Not applicable

15. Whether the appraisal report is for a limited price, specific price, or special price: No or Not applicable

16. Whether the appraisal report has not yet been obtained: No or Not applicable

17. Reason for not obtaining the appraisal report: Not applicable

18. Reasons for significant differences in appraisal results and auditor's opinion: Not applicable

19. Name of auditor firm: Not applicable

20. Name of auditor: Not applicable

21. Auditor 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. Opinion of any director who objected to this transaction: Not applicable

25. This transaction is a related-party transaction: Yes

26. Date of supervisor approval or audit committee consent: Not applicable

27. This transaction involves acquiring real estate or right-of-use assets from a related party: No

28. Valuation price under Article 16 of the 'Asset Acquisition and Disposal Rules for Publicly Issued Companies': Not applicable

29. Valuation price under Article 17 of the same rules if the valuation under the previous item is lower than the transaction price: Not applicable

30. Previous date of major information announcement regarding the same event: Not applicable

31. Other explanatory matters: None