[ASEH] ASE Semiconductor Acquires Machinery and Equipment from TOKYO ELECTRON LIMITED

ASE Technology Holding Co., Ltd. (ASEH) has announced on behalf of its subsidiary, Advanced Semiconductor Engineering, Inc. (ASE), the acquisition of machinery and equipment for business operations from TOKYO ELECTRON LIMITED.

The detailed disclosure of the transaction is as follows:

1. Name and nature of the subject matter: Machinery and equipment for business operations. 2. Date of occurrence of the event: November 19, 2025, to June 11, 2026. 3. Date of approval by the Board of Directors: Not applicable. 4. Date of other approval/decision: Approved by the General Manager on June 11, 2026. 5. Transaction volume, unit price, and total transaction amount: Volume is one batch. The cumulative total transaction amount is NT$1,008,466 thousand (excluding tax). 6. Counterparty and its relationship with the Company: TOKYO ELECTRON LIMITED. There is no relationship between the counterparty and the Company. 7. Reason for choosing a related party as the transaction counterparty (if applicable): Not applicable. 8. History of ownership of the subject matter by related parties in the past five years (if applicable): Not applicable. 9. Estimated gain (or loss) from disposal: Not applicable (for asset acquisition). 10. Delivery or payment terms, contract restrictive covenants, and other important agreements: Payment via wire transfer (T/T) or Letter of Credit (L/C). There are no restrictive covenants or other special agreements. 11. Method of determining the transaction price, reference basis, and decision-making unit: Determined through price comparison and negotiation. The decision-making unit acted in accordance with the internal delegation of authority rules. 12. Name of professional appraiser firm 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 limited, specific, or special price: No or not applicable. 16. Whether the appraisal report has not been obtained yet: No or not applicable. 17. Reason for not obtaining the appraisal report: Not applicable. 18. Reason for significant difference in appraisal results and opinion of CPA: 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 production and operational use. 24. Opinions of directors expressing dissent to the transaction: Not applicable. 25. Whether the transaction is a related-party transaction: No. 26. Date of Supervisor's recognition or Audit Committee's consent: Not applicable. 27. Whether the transaction is an acquisition of real property or right-of-use assets thereof from a related party: No. 28. Appraisal price evaluated under Article 16 of the Regulations Governing the Acquisition and Disposal of Assets by Public Companies: Not applicable. 29. Appraisal price evaluated under Article 17 of the Regulations when evaluated price is lower than transaction price: Not applicable. 30. Date of previous announcement of material information on the same event: Not applicable. 31. Other clear statements: None.

This transaction represents a standard equipment procurement by ASE to support its ongoing manufacturing operations and secure stable production capacity through high-quality semiconductor equipment from Tokyo Electron.