Chung Hsin Fiber Subsidiary Chiu Chang Announces Sale of Taichung Bank Common Shares Exceeding NT$300 Million

1. Security Name: Common shares of Taichung Commercial Bank Co., Ltd.

2. Transaction Date: April 24, 2026 to June 29, 2026 (Minguo Year 115)

3. Board Approval Date: Not applicable

4. Other Approval Dates: Approval Level: Approved by Chairman April 22, 2026 (Minguo Year 115)

5. Transaction Quantity, Unit Price, and Total Amount: Quantity: 19,753,570 shares Unit Price: Average of approximately NT$19.39 Total Transaction Amount: NT$382,926,229

6. Disposal Gain (or Loss) (not applicable for acquisition of securities): Disposal gain of approximately NT$228,010 thousand

7. Relationship with the Target Company: Taichung Bank is an equity-method investee company of parent company Chung Hsin Fiber.

8. Cumulative Holdings of the Subject Securities (including this transaction) to Date – Quantity, Amount, Ownership Percentage, and Restrictions (e.g., pledged shares): Chung Hsin: 1,277,768,406 shares, NT$20,269,770,990, 21.22%, 592,060 thousand shares pledged Pan Ya: 341,322,463 shares, NT$5,414,493,303, 5.63%, no pledged shares Te Hsing Investment: 17,650,648 shares, NT$275,487,211, 0.29%, 4,500 thousand shares pledged Chiu Chin Industrial: 10,354,498 shares, NT$212,784,934, 0.17%, 9,175 thousand shares pledged Chiu Chang: 0 shares, NT$0, 0%, no pledged shares

9. Cumulative securities investments (including this transaction) under Article 3 of the 'Asset Acquisition and Disposal Rules for Publicly Issued Companies' 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: 0.74%, 1.34%, NT$213,965,015

10. Specific Purpose of Acquisition or Disposal: Realization of gains

11. Dissenting Director Opinions on this Transaction: Not applicable

12. Is this a Related-Party Transaction: No

13. Counterparty and Relationship with the Company: Not applicable

14. Supervisor Approval or Audit Committee Consent Date: Not applicable. Reason: Approved by Chairman on April 22, 2026 (Minguo Year 115)

15. Previous Date of Material Information Disclosure on the Same Event: Not applicable

16. Other Disclosures: The disposal gain is estimated at approximately NT$228,010 thousand based on acquisition cost; however, under IFRS 9, the actual gain or loss recognized in the current year will depend on the financial statements audited or reviewed by independent certified public accountants.