AUO Disposes of Kaohsiung Plant Facilities and Related Utility Assets

1. Name and nature of the subject property (e.g., land located in Section XX, Subsection XX, Beitun District, Taichung City): C5E factory and related utility facilities located at Lot 21, 21-1, Lukou Section, Lukujiao District, Luzhu District, Kaohsiung City

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

3. Date approved by the board of directors: July 30, 2026 (Minguo Year 115)

4. Other approval dates: Not applicable

5. Quantity of units traded (e.g., XX square meters, equivalent to XX ping), unit price, and total transaction amount: Building area: 96,571.82 square meters (approximately 29,212.98 ping) A batch of auxiliary equipment Total transaction amount: NT$6.3 billion (excluding 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): ASE Semiconductor Manufacturing Co., Ltd.; unrelated party

7. If the counterparty is a related party, state the reason for selecting the related party as the transaction counterpart, the previous transferor, the relationships 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 asset was a related party of the company within the past five years, state the date of acquisition and disposal, price, and relationship with the company at the time: Not applicable

9. Estimated gain (or loss) from disposal (not applicable for asset acquisition) (for deferred gains, provide a table showing recognition schedule): Estimated disposal gain of approximately NT$4.28 billion (after deducting related transaction costs and estimated taxes)

10. Delivery or payment terms (including payment periods and amounts), contractual restrictions, and other important agreements: Payment in installments according to the terms of the real estate sales contract

11. Method of transaction decision (e.g., bidding, price comparison, negotiation), basis for price determination, and decision-making unit: Transaction decision method: Negotiation Basis for price determination: Market conditions and professional appraisal reports Decision-making unit: Board of Directors

12. Name of the professional appraisal firm or company and the appraised value: 1. Tianhe Real Estate Appraisers Joint Office, appraised value: NT$6.01 billion (excluding tax) 2. Hanna Real Estate Appraisers Joint Office, appraised value: NT$5.913 billion (excluding tax)

13. Names of professional appraisers: 1. Li Zhiwei 2. Liu Chenkai, Chen Haohan

14. Appraiser license numbers: 1. (108) Taipei Appraiser No. 000272 2. (112) Taipei Appraiser No. 000319, (106) Taipei Appraiser No. 000244

15. Whether the appraisal report provides 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. Reasons for significant differences in appraisal results and auditor's opinion: Not applicable

19. Name of the auditor firm: Not applicable

20. Name of the auditor: Not applicable

21. Auditor license number: Not applicable

22. Broker and brokerage fees: Not applicable

23. Specific purpose or use for the acquisition or disposal: Focus on light-asset operations, asset monetization, and financial structure optimization

24. Opinion of any director who objected to the transaction: None

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

26. Date of supervisor approval or audit committee consent: July 29, 2026 (Minguo Year 115)

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

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

29. Valuation amount 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 disclosure regarding the same event: Not applicable

31. Other explanatory matters: To accelerate the transfer timeline of the subject property and considering the demolition costs arising from this transaction, both parties agreed that the company will accelerate the dismantling, relocation, and removal operations of manufacturing equipment and specific utility equipment, and ASE Semiconductor Manufacturing Co., Ltd. will compensate the company for the resulting removal costs, estimated at approximately NT$500 million (excluding tax).