[TSU] Announcement of Consolidated Financial Results for May 115

1. Date of occurrence: 115/06/04 2. Company name: Taiwan Steel Union Co., Ltd. 3. Relationship to the company: The Company 4. Mutual shareholding ratio: Not applicable 5. Reason for occurrence: (Unit: NT$1,000) Item May 115 May 114 Jan-May 115 Jan-May 114 Consolidated Revenue 278,202 276,315 1,086,114 1,011,370 Consolidated Operating Profit 152,647 118,520 522,432 412,577 Consolidated Pre-tax Profit 149,933 111,022 516,107 393,956 This data is the company's consolidated self-settled figure and has not been audited by an accountant.

Company revenue mainly comes from zinc oxide sales and waste recycling income. Recycling income is recognized based on the actual amount of reuse. The shipment volume of zinc oxide is as follows, and revenue recognition is handled in accordance with the provisions of the Regulations Governing the Preparation of Financial Reports by Securities Issuers: 115 114 May Shipment Volume (Tons) 4,513 4,224 Jan-May Shipment Volume (Tons) 20,656 22,493

The company's May 115 self-settled revenue was announced on the Market Observation Post System on June 4, 115. 6. Countermeasures: Not applicable. 7. Other matters: None.