ASE Holding Announces Subsidiary's Acquisition of Facility Engineering Assets from Jing Tai Engineering

Announcement Date: 2026/07/08 Statement Date: 2026/07/07 Statement Time: 16:56:02 Company Code: 3711 Company Name: ASE Holding Subject: Announcement on behalf of subsidiary ASE Semiconductor Manufacturing Co., Ltd. regarding the acquisition of facility engineering assets for business operations from Jing Tai Engineering Co., Ltd. Compliance Clause: Item 20 Date of Occurrence: 2026/07/07 Details: 1. Name and nature of the subject matter (e.g., land located in Section XX, Subsection XX, North District, Taichung City): Facility engineering assets for business operations 2. Date of occurrence: 2025/07/10 ~ 2026/07/07 3. Board approval date: Not applicable 4. Other approval dates: Approval level: Approved by General Manager July 7, 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$314,133 thousand (excluding tax) Total transaction amount: NT$314,133 thousand (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: Jing Tai Engineering Co., Ltd. Relationship with the company: None 7. If the counterparty is a related party, disclose the reason for selecting the related party as the transaction party, the previous owner, the relationships among 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 within the past five years was a related party of the company, 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. Method of determining the transaction (e.g., bidding, competitive bidding, or negotiation), basis for price determination, and decision-making unit: Transaction determination method and pricing basis: Competitive bidding and negotiation Decision-making unit: In accordance with the company's internal approval authority regulations 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 restricted 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 obtaining the appraisal report: Not applicable 18. Reasons for significant differences in appraisal results and auditor's opinion: Not applicable 19. Name of accounting firm: Not applicable 20. Name of auditor: Not applicable 21. License number of auditor: Not applicable 22. Broker and brokerage fees: None 23. Specific purpose or use of the acquisition or disposal: For production and operational use 24. Opinions of directors who objected to the transaction: Not applicable 25. Whether the transaction is with a related party: No 26. Date of supervisor approval or audit committee consent: Not applicable 27. Whether the transaction involves acquiring real estate or right-of-use assets from a related party: No 28. Valuation price according to Article 16 of the 'Asset Acquisition and Disposal Rules for Publicly Issued Companies': Not applicable 29. Valuation price according to 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 material information disclosure regarding the same event: Not applicable 31. Other explanatory matters: None