Sunmaychi Announces Organizational Restructuring of Subsidiary Investment

Release Date: July 17, 2026 Statement Date: July 16, 2026 Statement Time: 17:29:38 Company Code: 2442 Company Name: Sunmaychi Subject: Announcement Regarding Subsidiary Investment Restructuring – Supplemental Explanation to the April 14, 2026 Announcement Applicable Clause: Clause 20 Factual Date: July 16, 2026

1. Name and Nature of the Subject Matter (if preferred shares, specify terms such as dividend rate): Ordinary shares of Chicheng Capital Co., Ltd. (formerly Chicheng Construction Co., Ltd.)

2. Factual Date: July 16, 2026 ~ July 16, 2026

3. Board Approval Date: April 14, 2026

4. Other Approval Dates: Not applicable

5. Transaction Quantity, Unit Price, and Total Amount: Number of Units: 29,100,000 shares Unit Price: Approximately NT$10 per share Total Transaction Amount: NT$291,000,000

6. Counterparty and Relationship with the Company (if individual and not a related party, name may be omitted): Counterparty: Yaolin Co., Ltd. Relationship: Yaolin Co., Ltd. is a 100%-owned subsidiary of the Company

7. If the counterparty is a related party, disclose the reason for selection, previous transferor, relationship among previous transferor, company, and counterparty, transfer date, and amount: (1) Reason for selecting related party: Group organizational restructuring (2) Previous transfer information: Not applicable

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

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

10. Gain (or loss) from disposal (not applicable if acquiring securities) (if previously deferred, explain recognition): The transaction is part of internal group restructuring and results in no disposal gain or loss in the consolidated financial statements.

11. Delivery or payment terms (including payment periods and amounts), contractual restrictions, and other important agreements: As stipulated in the contract

12. Decision-making method, pricing reference basis, and decision-making unit: Decision-making method and unit: Board of Directors Pricing reference basis: Evaluated based on net asset value from internal financial statements and estimated capital increase amount

13. Net asset value per share of the securities-issuing company: NT$9.99

14. Cumulative holdings (including this transaction) of the securities as of now – quantity, amount, ownership percentage, and rights restrictions (e.g., pledge status): Quantity: 13,850,000 shares Amount: NT$138,500,000 Ownership Percentage: 32.25% Rights Restrictions: None

15. Cumulative securities investments under Article 3 of the 'Asset Acquisition and Disposal Rules for Publicly Issued Companies' (including this transaction) as a percentage of total assets and equity attributable to owners of the parent in the latest financial statements, and the amount of working capital: Percentage of total assets: 4.99% Percentage of shareholders' equity: 15.90% Working capital amount: NT$7,725,141 thousand

16. Broker and brokerage fees: Not applicable

17. Specific purpose or use of the acquisition or disposal of securities: Group organizational restructuring

18. Dissenting opinions from directors regarding the transaction: None

19. Whether this transaction is a related-party transaction: Yes

20. Date of supervisor approval or audit committee consent: April 14, 2026

21. Whether the accountant issued a non-reasonableness opinion: No

22. Name of accounting firm: Yung Sheng United Certified Public Accountants

23. Name of accountant: Wu Shang-Wen

24. Accountant’s license number: Taipei City CPA Certificate No. 1713 Taiwan Provincial CPA Certificate No. 1951

25. Whether this involves 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: Yaolin Co., Ltd. is a construction contractor for the Company, and transactions are normal engineering contracting activities. Amount paid in the past year: NT$82,500,000 Expected payment in the next year: NT$205,448,210

28. Source of funds: Internal funds

29. Previous date of material information disclosure on the same event: April 14, 2026

30. Other explanatory matters: Supplemental explanation to the April 14, 2026 announcement, correcting the cumulative holdings of the securities including quantity, amount, and ownership percentage.