[PSMC] Announcement of Acquisition of Semiconductor Manufacturing Facilities and Equipment

1. Name and nature of the underlying asset: Semiconductor product manufacturing facilities and machinery equipment

2. Date of occurrence of the event: August 1, 2025 to June 2, 2026 (Minguo 114/8/1 to 115/6/2)

3. Date of approval by the Board of Directors: Not applicable

4. Other date of approval: Approval level: General Manager June 2, 2026

5. Transaction unit volume, unit price, and total transaction amount: Transaction unit volume: One batch Unit price: As agreed by both parties Total transaction amount: NT$1,556,641 thousand, based on the agreed terms

6. Counterparty and its relationship with the Company: Counterparty: Applied Materials South East Asia Pte. Ltd. Relationship with the Company: None

7. Where the counterparty is a related party, the reason for choosing them and details of prior transfer: Not applicable

8. Where the owner of the underlying asset in the past 5 years was a related party of the Company: Not applicable

9. Estimated gain (or loss) from disposal: Not applicable (acquisition of assets)

10. Terms of delivery or payment, restrictive covenants, and other important agreements: (1) Terms of delivery or payment: As agreed by both parties (2) Restrictive covenants and other important agreements: None

11. The method of determining the transaction, the reference basis for the price decision, and the decision-making unit: Method of transaction determination: Price comparison and negotiation Reference basis for price decision: Based on quotation sheets provided by the original manufacturer and other vendors. After price comparison and negotiation, decided by the Procurement Department and User Department according to authorized approval levels. Decision-making unit: General Manager

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

13. Name of professional appraiser: Not applicable

14. Appraiser license number: Not applicable

15. Whether the appraisal report contains limited, specific or special prices: 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. Reason for major discrepancy in appraisal results and CPA opinions: Not applicable

19. Name of CPA firm: Not applicable

20. Name of CPA: Not applicable

21. CPA license number: Not applicable

22. Broker and brokerage fee: None

23. Concrete purpose or use of the acquisition or disposal: For wafer product manufacturing use

24. Dissenting opinions of directors concerning this transaction: Not applicable

25. Whether the transaction is a related-party transaction: No

26. Date of approval by supervisors or consent by the Audit Committee: Not applicable

27. Whether the transaction is an acquisition of real estate or right-of-use assets thereof from a related party: No

28. Appraised price evaluated pursuant to Article 16 of the Regulations Governing the Acquisition and Disposal of Assets by Publicly Held Companies: Not applicable

29. If the appraised price is lower than the transaction price, evaluated pursuant to Article 17 of the same Regulations: Not applicable

30. Date of previous announcement of material information on the same event: Not applicable

31. Other explanatory matters: None.