8499 Dingxuan-KY: Affiliate Longyang Electric (Kunshan) Announces Acquisition of Deposit-Linked Wealth Management Product

Announcement Date: June 26, 2026 Statement Date: June 25, 2026 Statement Time: 16:15:35 Company Code: 8499 Company Name: Dingxuan-KY Subject: Announcement on behalf of affiliate Longyang Electric (Kunshan) Co., Ltd. regarding the acquisition of a deposit-linked wealth management product Applicable Clause: Clause 20 Factual Date: June 25, 2026

1. Name and nature of the subject matter (for preferred shares, specify issuance terms such as dividend rate): CTBC Wealth Management Anying Elephant Fixed-Income Stable Two-Month Holding Period No. 46 Wealth Management Product AF264980

2. Factual Date: June 25, 2026 ~ June 25, 2026

3. Board Approval Date: Not applicable

4. Other Approval Dates: Approval Level: Executed according to company's authorization authority June 25, 2026

5. Transaction quantity, unit price, and total transaction amount: No. 46 Wealth Management Product AF264980 60 days: NT$49.7 million

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): CTBC Bank Co., Ltd.; Relationship with company: None

7. If the counterparty is a related party, state the reason for selecting the related party as the transaction counterparty, the previous transferee, the relationship among the previous transferee, the company, and the counterparty, the transfer date, and the transfer amount: Not applicable

8. If the owner of the subject matter had been a related party of the company within the past five years, state the related party's acquisition and disposal dates, price, and relationship with the company at the time of transaction: Not applicable

9. Matters related to the disposal of receivables (including types of collateral attached to the disposed receivables; if the disposed receivables include receivables from related parties, state the name of the related party and the book value of the receivables disposed): Not applicable

10. Gain (or loss) from disposal (not applicable for acquisition of securities) (if previously deferred, list and explain recognition status): Not applicable

11. Delivery or payment terms (including payment period and amount), contractual restrictions, and other important agreements: Paid in full

12. Decision-making method for this transaction, reference basis for price determination, and decision-making unit: Executed according to company's authorization authority

13. Net asset value per share of the securities-issuing company acquired or disposed: Not applicable

14. Cumulative number, amount, ownership percentage, and rights restriction status (e.g., pledge status) of the securities of this transaction (including this transaction) held to date: Quantity: Not applicable Amount: NT$49.7 million Ownership percentage: Not applicable Rights restriction status: None Cumulative holding amount: NT$49.7 million

15. Cumulative securities investment (including this transaction) under Article 3 of the 'Regulations Governing the Acquisition or Disposition of Assets by Publicly Issued Companies' as a percentage of total assets and equity attributable to owners of the parent in the most recent financial statements, and the amount of working capital in the most recent financial statements: (1) Percentage of total assets: 23.869% (2) Percentage of equity attributable to owners of the parent: 46.544% (3) Working capital amount: NT$6,975,964 thousand

16. Broker and brokerage fees: Not applicable

17. Specific purpose or use of the acquisition or disposal: Short-term investment

18. Dissenting director's opinion on this transaction: Not applicable

19. Is this transaction a related-party transaction: No

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

21. Did the accountant issue a non-reasonable opinion on this transaction: Not applicable

22. Name of accounting firm: Not applicable

23. Name of accountant: Not applicable

24. Accountant's practice certificate number: Not applicable

25. Does it involve a change in business model: No

26. Explanation of business model change: Not applicable

27. Transaction status with the counterparty in the past year and expected in the next year: Not applicable

28. Source of funds: Own funds

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

30. Other explanatory matters: None