CSHC Announces Consolidated Revenue and Pre-Tax Profit for May 2026

1. Date of Fact: June 22, 2026 2. Company Name: China Steel Corporation 3. Relationship with Company (Please enter '本公司' or 'Subsidiary'):本公司 (Parent Company) 4. Cross-shareholding Ratio: Not applicable 5. Reason for Occurrence: None 6. Response Measures: None 7. Other Matters to be Disclosed (If the entity involved in the event or resolution is a publicly issued company or above, this significant information simultaneously meets the criteria under Article 7, Paragraph 9, Item 9 of the Enforcement Rules of the Securities and Exchange Act, regarding matters having significant impact on shareholders' equity or securities prices): China Steel Corporation has independently calculated its consolidated operating revenue for May 2026 at NT$29,955,286 thousand, and its consolidated pre-tax net profit at NT$1,354,442 thousand.