3711 ASE Group

Disclosure Date: 1150704 Statement Date: 1150703 Statement Time: 182303 Company Code: 3711 Company Name: ASE Group Subject: Announcement on behalf of subsidiary ASE Semiconductor Manufacturing Co., Ltd. regarding the acquisition of machinery and equipment for business operations from KLA CORPORATION Compliance Clause: Article 20 Date of Occurrence: 1150703 Details: 1. Name and nature of the subject matter (e.g., land located in Section XX, Subsection XX, North District, Taichung City): Machinery and equipment for business operations 2. Date of occurrence: 115/5/13 ~ 115/7/3 3. Board approval date: Not applicable 4. Other approval dates: Approval level: Approved by General Manager July 3, 2026 (Minguo Year 115) 5. Quantity of units (e.g., XX square meters, equivalent to XX ping), unit price, and total transaction amount: Transaction quantity: One batch Unit price: NT$1,116,382 million (excluding tax) Total transaction amount: NT$1,116,382 million (excluding tax) 6. Counterparty and its relationship with the company (if the counterparty is an individual and not a related party, name disclosure may be omitted): Counterparty: KLA CORPORATION Relationship with the company: None 7. If the counterparty is a related party, state the reason for selecting the related party as the transaction party, the previous owner, the relationship between the previous owner, the company, and the counterparty, the previous transfer date, and the transfer amount: Not applicable 8. If the owner of the subject matter was a related party of the company within the past five years, disclose the related party's acquisition and disposal date, price, and relationship with the company at the time of transaction: Not applicable 9. Estimated gain (or loss) from disposal (not applicable for asset acquisition) (if deferred, provide a table showing recognition): Not applicable 10. Delivery or payment terms (including payment period and amount), contractual restrictions, and other important agreements: Delivery or payment terms: Payment by telegraphic transfer or letter of credit Contractual restrictions: None Other important agreements: None 11. Decision method for this transaction (e.g., bidding, price comparison, or negotiation), basis for price determination, and decision-making unit: Decision method and basis for price determination: Price comparison and negotiation Decision-making unit: In accordance with the company's internal approval authority 12. Name of professional appraiser firm or company and appraisal amount: Not applicable 13. Name of professional appraiser: Not applicable 14. License number of professional appraiser: Not applicable 15. Whether the appraisal report is for a limited price, specific price, or special price: No or not applicable 16. Whether an appraisal report has 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 result, state the reason for the difference and the accountant's opinion: Not applicable 19. Name of accounting firm: Not applicable 20. Name of accountant: Not applicable 21. License number of accountant: Not applicable 22. Broker and brokerage fees: None 23. Specific purpose or use of the acquisition or disposal: For production and business operations 24. Opinions of directors who objected to this transaction: Not applicable 25. This transaction is a related-party transaction: No 26. Date of supervisor approval or audit committee consent: Not applicable 27. This transaction involves acquiring real estate or its right-of-use assets from a related party: No 28. Price evaluated under Article 16 of the 'Asset Acquisition and Disposal Rules for Publicly Issued Companies': Not applicable 29. Price evaluated under Article 17 of the same rules, if the price under the previous item is lower than the transaction price: Not applicable 30. Previous date of material information disclosure regarding the same event: Not applicable 31. Other statements: None