Taiwan Steel Union Co., Ltd. Announces Unaudited Consolidated Profit and Loss for March 2026

1. Date of occurrence of the event: 2026/04/08 2. Company name: Taiwan Steel Union Co., Ltd. 3. Relationship with the company (please enter 'this company' or 'subsidiary'): This company 4. Mutual shareholding ratio: Not applicable 5. Reason for occurrence: (Unit: NTD Thousand) March 2026 March 2025 Jan-Mar 2026 Jan-Mar 2025 Consolidated Net Operating Revenue 130,063 185,537 435,086 492,781 Consolidated Unaudited Operating Profit 45,896 77,809 168,083 189,288 Consolidated Unaudited Pre-tax Profit 46,786 79,155 168,115 179,449 This data is the company's consolidated unaudited figures and has not been audited by an accountant. The company's revenue mainly comes from zinc oxide sales and waste recycling revenue from customers. Waste recycling revenue is recognized based on actual recycling volume. The zinc oxide shipment quantities are as follows, and revenue recognition is handled in accordance with the Regulations Governing the Preparation of Financial Reports by Securities Issuers: 2026 2025 March shipment quantity (tons) 6,136 3,383 Jan-Mar shipment quantity (tons) 11,768 13,943 The company's unaudited revenue for March 2026 was announced on the Market Observation Post System on April 8, 2026. 6. Countermeasures: Not applicable. 7. Other matters to be specified (if the subject of the event or resolution is a public company or above, this material information also complies with Article 7, Paragraph 9 of the Enforcement Rules of the Securities and Exchange Act, which has a significant impact on shareholders' equity or securities prices): None.