3711 ASE Holding Announces Subsidiary's Acquisition of Production Equipment Exceeding NT$2.3 Billion

Date of Announcement: July 7, 2026 Date of Statement: July 6, 2026 Time of Statement: 20:45:46 Company Code: 3711 Company Name: ASE Holding Subject: Announcement on behalf of subsidiary Silicon Precision Industries Co., Ltd. regarding acquisition of operating machinery and equipment exceeding NT$1 billion Applicable Clause: Clause 20 Date of Event: July 6, 2026

1. Name and nature of the subject matter (e.g., land located in Section XX, Subsection XX, North District, Taichung City): Operating machinery and equipment

2. Date of Event: June 15, 2026 ~ July 6, 2026

3. Board approval date: Not applicable

4. Other approval dates: Approval level: Approved by General Manager July 6, 2026 (ROC Year 115)

5. Quantity of units (e.g., XX square meters, equivalent to XX ping), unit price, and total transaction amount: Acquired 7 batches Average unit price per batch: NT$334,743,565 Total transaction amount: NT$2,343,204,958

6. Counterparty and its relationship with the company (if the counterparty is a natural person and not a related party of the company, 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 counterparty, the previous transferor, the relationship among the previous transferor, 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 date of acquisition and disposal by the related party, the price, and the relationship with the company at the time of transaction: Not applicable

9. Estimated gain (or loss) on 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 restriction clauses, and other important agreed matters: Wire transfer. Contractual restriction clauses: None. Other important agreed matters: None.

11. Decision method of this transaction (e.g., bidding, price comparison, or negotiation), reference basis for price determination, and decision-making unit: Transaction decision method: Price comparison/negotiation. Reference basis for price determination: Reference to historical transaction data and market conditions. Decision-making unit: Decided according to internal company 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 obtaining the appraisal report: Not applicable

18. If there is a significant difference in the appraisal result, 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 fee: None

23. Specific purpose or use of the acquisition or disposal: For operational use

24. Opinion of any director who expressed dissent on this transaction: None

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 right-of-use assets from a related party: No

28. Valuation price under Article 16 of the 'Asset Acquisition and Disposal Rules for Publicly Issued Companies': Not applicable

29. Valuation price under 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 release regarding the same event: Not applicable

31. Other explanatory matters: None