[Powertech Technology] Public Announcement of Machinery and Equipment Procurement

1. Name and nature of the underlying asset: Packaging equipment and spare parts. 2. Date of occurrence: October 28, 2025 to June 2, 2026. 3. Date of approval by the Board of Directors: Not applicable. 4. Date of other approval: Approval level: Chairman. June 2, 2026. 5. Transaction volume, unit price, and total transaction amount: One batch; Total transaction amount: NTD 503,786,850. 6. Counterparty and relationship with the Company: KLA CORPORATION; Relationship: None. 7. Reason for selecting a related party as counterparty and details of previous transfers (if applicable): Not applicable. 8. Information on owners who were related parties within the past five years (if applicable): Not applicable. 9. Estimated gain (or loss) on disposal (not applicable to asset acquisition): Not applicable. 10. Terms of delivery or payment, contract restrictions, and other important covenants: Payments shall be made in accordance with the purchase agreement (purchase order). 11. Method of determining the transaction, reference basis for price determination, and decision-making unit: Price comparison and negotiation were conducted according to the company's procurement guidelines, and procurement was executed after approval by the responsible supervisor. 12. Name of professional appraisal firm and appraised value: Not applicable. 13. Name of professional appraiser: Not applicable. 14. License number of professional appraiser: Not applicable. 15. Whether the appraisal report is for limited, specific, or special price: No or Not applicable. 16. Whether the appraisal report has not yet been obtained: Yes. 17. Reason for not obtaining the appraisal report: Not applicable. 18. Reason for material discrepancy and CPA's opinion (if applicable): Not applicable. 19. Name of CPA firm: Not applicable. 20. Name of CPA: Not applicable. 21. License number of CPA: Not applicable. 22. Broker and brokerage fee: Not applicable. 23. Concrete purpose or use of acquisition or disposal: For operational and production use. 24. Dissenting opinions from directors on this transaction: Not applicable. 25. Whether the transaction is a related party transaction: No. 26. Date of approval by supervisors or consent by Audit Committee: Not applicable. 27. Whether the transaction involves 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 Public Companies: Not applicable. 29. Appraised price evaluated pursuant to Article 17 of the Regulations when the appraised price is lower than the transaction price: Not applicable. 30. Date of previous announcement on the same event: Not applicable. 31. Other matters to be specified: None.