DY Technology Subsidiary Yuanmao Optoelectronics (Wuhan) Co., Ltd. Announces Cumulative RMB-Linked Principal-Guaranteed Structured Deposits Reached Disclosure Threshold

1. Name and nature of the subject matter (if preferred shares, specify issuance terms such as dividend rate): RMB Structured Deposit Products

2. Date of occurrence: 115/4/23 ~ 115/7/23

3. Board approval date: Not applicable

4. Other approval dates: Approval level: Approved by Chairman July 23, 115 (Minguo calendar)

5. Transaction quantity, unit price, and total transaction amount: RMB 83,000,000

6. Counterparty and its relationship with the company (if the counterparty is a natural person and not a related party, name disclosure may be omitted): Industrial Bank / Non-related party

7. If the counterparty is a related party, disclose the reason for selecting them, previous transferor, relationships among previous transferor, company, and counterparty, transfer date, and amount: Not applicable

8. If the ownership of the subject asset was held by a related party of the company within the past five years, disclose the related party’s acquisition and disposal dates, price, and relationship with the company at the time: Not applicable

9. Matters related to the disposal of receivables (including types of collateral attached to disposed receivables; if receivables from related parties, disclose names and book value amounts): Not applicable

10. Gain (or loss) from disposal (not applicable for acquisition of securities) (if previously deferred, provide a table showing recognition status): Not applicable

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

12. Decision-making method for this transaction, reference basis for pricing, and decision-making unit: Based on company’s internal approval authority

13. Net asset value per share of the securities-issuing company (if applicable): Not applicable

14. Cumulative holdings (including this transaction) of these securities to date, including quantity, amount, ownership percentage, and any rights restrictions (e.g., pledge status): RMB 41,000,000 Rights restriction status: None

15. Cumulative securities investments (including this transaction) under Article 3 of the 'Regulations on 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 company’s latest financial statements, and the amount of working capital in the latest financial statements (Note 2): Percentage of total assets in parent’s latest standalone financial statements: 8.30% Percentage of equity attributable to owners of the parent in latest consolidated financial statements: 10.32% Working capital amount in parent’s latest standalone financial statements: NT$1,410,180 thousand

16. Broker and brokerage fees: Not applicable

17. Specific purpose or use of the acquisition or disposal: Redemption of principal-guaranteed floating-return structured deposits

18. Dissenting opinions from directors regarding this transaction: Not applicable

19. Is this transaction with a related party? No

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

21. Did the accountant issue a non-reasonableness opinion on this transaction? Not applicable

22. Name of accounting firm: Not applicable

23. Name of accountant: Not applicable

24. Accountant’s license number: Not applicable

25. Does this involve a change in business model? No

26. Explanation of business model change: Not applicable

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

28. Source of funds: Internal funds

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

30. Other explanatory matters: None