ASE Holding Announces Subsidiary ASE Semiconductor Manufacturing Co., Ltd. Acquires Land and Buildings in Zhongli Industrial Park

1. Name and nature of the subject property (e.g., land located at Section XX, Subsection XX, Beitun District, Taichung City): Land: Lots 985-0, 986-0, and 987-1, Zhonggong Section, Zhongli District, Taoyuan City Buildings: Building numbers 96-0, 96-1, 112-0, 222-0, 223-0, 224-0, 1962-0, and 1963-0, Zhonggong Section, Zhongli District, Taoyuan City

2. Date on which the event occurred: 7/30/115 ~ 7/30/115

3. Board approval date: July 30, 2026 (Minguo Year 115)

4. Other approval dates: Not applicable

5. Quantity of units transacted (e.g., XX square meters, equivalent to XX ping), unit price, and total transaction amount: Transaction quantity: Land area: 37,573 square meters (approximately 11,365.83 ping) Building area: 29,294.48 square meters (approximately 8,861.58 ping) Total transaction amount: NT$5,672,650,671 (exclusive of tax)

6. Counterparty and its relationship with the company (if the counterparty is an individual and not a related party of the company, name disclosure may be omitted): Counterparty: Gua Gua Co., Ltd. (hereinafter referred to as 'Gua Gua Company') 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 between the previous transferor and the company and the counterparty, the previous transfer date, and the transfer amount: Not applicable

8. If the owner of the subject asset was a related party of the company within the past five years, state 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 schedule): Not applicable

10. Delivery or payment terms (including payment periods and amounts), contractual restrictions, and other important agreements: Payment terms: As stipulated in the sales contract Contractual restrictions: None Other important agreements: None

11. Method of determining the transaction (e.g., bidding, price comparison, or negotiation), reference basis for price determination, and decision-making unit: Method of transaction determination and decision-making unit: Approved by resolution of the Board of Directors of ASE Semiconductor Manufacturing Company Reference basis for price determination: Based on valuation reports issued by two professional appraisal firms, and negotiated with Gua Gua Company through a real estate broker.

12. Name of professional appraisal firm or company and appraisal amount: Appraisal firm: Tianhe Real Estate Appraisers Joint Office Appraisal amount: NT$5,206,992,128 (exclusive of tax) Appraisal firm: Cushman & Wakefield Real Estate Appraisers Office Appraisal amount: NT$5,223,705,820 (exclusive of tax)

13. Names of professional appraisers: A: Tianhe Real Estate Appraisers Joint Office: Li Zhi-wei B: Cushman & Wakefield Real Estate Appraisers Office: Hu Chun-chun

14. License numbers of professional appraisers: A: (108) Beishi Gu No. 000272 B: (100) Beishi Gu No. 000175

15. Whether the appraisal report is for a limited price, specific price, or special price: No or not applicable

16. Whether the appraisal report has not yet been obtained: No or not applicable

17. Reason for not obtaining the appraisal report: Not applicable

18. If there are significant differences in appraisal results, state the reasons and the accountant's opinion: Not applicable

19. Name of accounting firm: Not applicable

20. Name of accountant: Not applicable

21. Accountant's license number: Not applicable

22. Broker and brokerage fees: None

23. Specific purpose or use for the acquisition or disposal: To meet future capacity expansion needs at ASE Company's Zhongli plant

24. Opinions of directors who objected to this transaction: Not applicable

25. Whether this transaction is a related-party transaction: No

26. Date of supervisor approval or audit committee consent: Not applicable

27. Whether this transaction involves acquiring real estate or its right-of-use assets from a related party: No

28. Evaluation price under Article 16 of the 'Regulations Governing the Acquisition or Disposition of Assets by Publicly Issued Companies': Not applicable

29. Evaluation price under Article 17 of the same regulations if the price evaluated under the previous item is lower than the transaction price: Not applicable

30. Previous date on which material information regarding the same event was disclosed: Not applicable

31. Other explanatory matters: In coordination with Gua Gua Company's factory relocation schedule, Gua Gua Company intends to immediately lease back all the land and buildings from ASE Company upon completion of this transaction. The western plant will be leased for 6 months and the eastern plant for 24 months. Specific leasing terms will be separately stipulated in a lease agreement.