8499 Ding Xuan-KY: Announcement on Behalf of Subsidiary Longyang Electronic (Kunshan) Co., Ltd. Regarding the Disposal of Deposit Wealth Management Products

Announcement Date: 2026/05/16 Statement Date: 2026/05/15 Statement Time: 13:56:01 Company Code: 8499 Company Name: Ding Xuan-KY Subject: Announcement on Behalf of Subsidiary Longyang Electronic (Kunshan) Co., Ltd. Regarding the Disposal of Deposit Wealth Management Products Applicable Clause: Article 20 Date of Occurrence: 2026/05/15 Explanation: 1. Name and nature of the target (for preferred shares, the agreed issuance conditions, such as dividend rate, should also be indicated): CTBC Co-Prosperity Smart Gold-Linked RMB Structured Deposit A29036 Series C26A29036 CTBC Co-Prosperity Smart Gold-Linked RMB Structured Deposit A29037 Series C26A29037 2. Date of occurrence: 2026/05/15 to 2026/05/15 3. Date of board resolution: Not applicable 4. Other approval dates: Approval level: Handled according to company's approval authority May 15, 2026 5. Quantity, unit price, and total transaction amount: A29036 Series C26A29036 90 days: RMB 40 million A29037 Series C26A29037 90 days: RMB 40 million 6. Counterparty and its relationship with the company (if the counterparty is a natural person and not a related party of the company, their name may be omitted): CTBC Bank Co., Ltd.; Relationship with the company: None 7. If the counterparty is a related party, the reasons for selecting the related party as the transaction object, the previous owner, the relationship between the previous owner and the company and the counterparty, the previous transfer date and transfer amount should also be announced: Not applicable 8. If the owner of the transaction target has been a related party of the company within the past five years, the acquisition and disposal dates, prices, and the relationship with the company at the time of the transaction should also be announced: Not applicable 9. Matters related to the disposal of claims (including the type of collateral attached to the claims, and if the disposed claims belong to claims against related parties, the name of the related party and the book value of the disposed claims against that related party should also be announced): Not applicable 10. Disposal gain (or loss) (not applicable for acquisition of securities) (if deferred, a table explaining the recognition situation should be provided): Approximately NT$ 1.663 million 11. Delivery or payment terms (including payment period and amount), contract restriction clauses, and other important agreements: Paid in full at once 12. Method of determining this transaction, reference basis for price determination, and decision-making unit: Handled according to company's approval authority 13. Net value per share of the target company for acquiring or disposing of securities: Not applicable 14. As of now, the cumulative quantity, amount, shareholding ratio, and restrictions on rights (such as pledge status) of this transaction security (including this transaction): Quantity: Not applicable Amount: RMB 80 million Shareholding ratio: Not applicable Restrictions on rights: None Cumulative holding amount: RMB 80 million 15. As of now, the proportion of investment in securities (including this transaction) listed in Article 3 of the 'Regulations Governing the Acquisition and Disposal of Assets by Public Companies' to the total assets and owners' equity attributable to the parent company in the latest financial report, and the working capital amount in the latest financial report (Note 2): (1) Proportion to total assets: 25.8% (2) Proportion to owners' equity attributable to the parent company: 50.307% (3) Working capital amount: NT$ 6,975,964 thousand 16. Broker and brokerage fees: Not applicable 17. Specific purpose or use of acquisition or disposal: Short-term investment 18. Opinions of dissenting directors for this transaction: Not applicable 19. Is this transaction a related party transaction: No 20. Date of approval by supervisors or audit committee: Not applicable 21. Auditor's opinion on the unreasonableness of this transaction: Not applicable 22. Accounting firm name: Not applicable 23. Accountant name: Not applicable 24. Accountant's license number: Not applicable 25. Does it involve a change in operating model: No 26. Explanation of change in operating model: Not applicable 27. Transaction status with the counterparty in the past year and expected next year: Not applicable 28. Source of funds: Own funds 29. Date of previous material information disclosure for the same event: Not applicable 30. Other matters to be specified: None