ASE Technology Holding Announces Subsidiary's Acquisition of Operating Equipment from Onto Innovation, Inc.

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 operational use

2. Date on which the event occurred: 02/09/115 ~ 06/29/115

3. Board approval date: Not applicable

4. Other approval dates: Approval level: Approved by the General Manager June 29, 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$1,011,830 thousand (excluding tax) Total cumulative transaction amount: NT$1,011,830 thousand (excluding tax)

6. Counterparty and its relationship with the company (if the counterparty is a natural person and not a related party of the company, the name may be omitted): Counterparty: Onto Innovation, Inc. Relationship with the company: None

7. If the counterparty is a related party, state the reason for selecting the related party as the transaction counterpart, 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 asset’s owner within the past five years was a related party of the company, state the date of acquisition and disposal, 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 restrictions, and other important agreements: Delivery or payment terms: Payment via telegraphic transfer or letter of credit Contractual restrictions: None Other important agreements: None

11. Method of determining the transaction (e.g., bidding, price comparison, or negotiation), basis for price determination, and decision-making unit: Method of determination and basis for price: Price comparison and negotiation Decision-making unit: As per the company’s 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 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. 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 fee: None

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

24. Opinion of directors who objected to the transaction: Not applicable

25. Whether the transaction is a related-party transaction: 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 as per Article 16 of the 'Asset Acquisition and Disposal Handling Standards for Publicly Issued Companies': Not applicable

29. Valuation price as per Article 17 if the valuation under the previous item is lower than the transaction price: Not applicable

30. Previous date of material information disclosure for the same event: Not applicable

31. Other explanatory matters: None