[Century Iron and Steel] Announcement pursuant to Article 25, Paragraph 1, Subparagraph 4 of the Regulations Governing Loaning of Funds and Making of Endorsements/Guarantees by Public Companies

1. Date of occurrence: 2026/04/21 2. The company being endorsed/guaranteed: (1) Company name: PT CENTURY INDONESIA WIND ENERGY (2) Relationship with the endorsing/guaranteeing company: A subsidiary in which the company holds 99.93% directly. (3) Limit of endorsement/guarantee (NTD thousands): 1,111,157 (4) Original balance of endorsement/guarantee (NTD thousands): 0 (5) Amount of new endorsement/guarantee (NTD thousands): 795,250 (6) Balance of endorsement/guarantee as of the date of occurrence (NTD thousands): 795,250 (7) Actual amount drawn down by the guaranteed company (NTD thousands): 0 (8) Reason for the new endorsement/guarantee: To act as a joint guarantor for subsidiary PT CENTURY INDONESIA WIND ENERGY in applying for a bank credit line. 3. Collateral provided by the guaranteed company: (1) Content: N/A (2) Value (NTD thousands): 0 4. Recent financial statement data of the guaranteed company: (1) Capital (NTD thousands): 97,137 (2) Accumulated profit/loss (NTD thousands): -8,691 5. Release from the endorsement/guarantee liability: (1) Conditions: Upon completion of the subsidiary's loan repayment and termination of the financing agreement with the bank. (2) Date: Upon expiration of the subsidiary's credit agreement. 6. Total limit on endorsements/guarantees (NTD thousands): 1,111,157 7. Balance of endorsements/guarantees as of the date of occurrence (NTD thousands): 795,250 8. Ratio of endorsements/guarantees balance to net worth of the company's recent financial statement: 7.16% 9. Ratio of the sum of endorsements/guarantees, long-term investments, and loan balances to net worth: 142.00% 10. Other matters to be specified: The aforementioned guarantee amount is converted using the Bank of Taiwan's average closing spot exchange rate of 31.81 on April 13, 2026.