Taisei Steel Announces Results of 2026 Shareholders' Meeting: Board of Directors (Including Independent Directors) Election and Newly Elected Members (Updated Titles)

1. Date of Change: 115/06/16

2. Category of Appointed or Changed Personnel (please specify: corporate director, corporate supervisor, independent director, individual director, or individual supervisor): corporate director, individual director, independent director

3. Former Titles and Names: Director: Hsieh Li-Yun, representative of Wei-Yi Investment Co., Ltd. Director: Hsieh Jung-Kun, representative of Da-Ying-Cheng Investment Co., Ltd. Director: Tsai Yung-Yu Director: Tsai Chao-Chin Director: Ou I-Lan, representative of Li-Chih Investment Co., Ltd. Director: Hsieh Ni-I Director: Tu Shih-Hsien Director: Lin Mei-Feng, representative of Taipei City Lin Fang-Chin Social Welfare & Charity Foundation Independent Director: Shen Ming-Chang Independent Director: Hsu Chun-An Independent Director: Wang Kuang-Hsiang Independent Director: Wang Kuang-Tz

4. Former Resumes: Director: Hsieh Li-Yun (Wei-Yi Investment Co., Ltd.) – Chairman of Ta-Cheng Stainless Steel Industrial Co., Ltd. Director: Hsieh Jung-Kun (Da-Ying-Cheng Investment Co., Ltd.) – Director and General Manager of Ta-Cheng Stainless Steel Industrial Co., Ltd. Director: Tsai Yung-Yu – Chairman of Chin-Ho Enterprise Co., Ltd. Director: Tsai Chao-Chin – Chairman of Fang-Sheng Screw Co., Ltd. Director: Ou I-Lan (Li-Chih Investment Co., Ltd.) – Chairman of Li-Chi Industrial Co., Ltd. Director: Hsieh Ni-I – Director of Ta-Cheng Stainless Steel Industrial Co., Ltd. Director: Tu Shih-Hsien – Vice President of Ta-Cheng International (USA) Director: Lin Mei-Feng (Taipei City Lin Fang-Chin Social Welfare & Charity Foundation) – Director of Ta-Cheng Stainless Steel Industrial Co., Ltd. Independent Director: Shen Ming-Chang – Independent Director, Compensation Committee Member, and Audit Committee Member of Ta-Cheng Stainless Steel Industrial Co., Ltd. Independent Director: Hsu Chun-An – Independent Director, Compensation Committee Member, and Audit Committee Member of Ta-Cheng Stainless Steel Industrial Co., Ltd. Independent Director: Wang Kuang-Hsiang – Independent Director, Compensation Committee Member, and Audit Committee Member of Ta-Cheng Stainless Steel Industrial Co., Ltd. Independent Director: Wang Kuang-Tz – Independent Director and Audit Committee Member of Ta-Cheng Stainless Steel Industrial Co., Ltd.

5. New Titles and Names: Director: Hsieh Li-Yun, representative of Wei-Yi Investment Co., Ltd. Director: Hsieh Jung-Kun, representative of Da-Ying-Cheng Investment Co., Ltd. Director: Tsai Yung-Yu Director: Tsai Chao-Chin Director: Ou I-Lan, representative of Li-Chih Investment Co., Ltd. Director: Hsieh Ni-I Director: Tu Shih-Hsien Director: Lin Mei-Feng, representative of Taipei City Lin Fang-Chin Social Welfare & Charity Foundation Independent Director: Lan Hsien-Ming Independent Director: Liang Chi-Yen Independent Director: Lee Pei-Ling Independent Director: Fang Yen-Ting

6. New Resumes: Director: Hsieh Li-Yun (Wei-Yi Investment Co., Ltd.) – Chairman of Ta-Cheng Stainless Steel Industrial Co., Ltd. Director: Hsieh Jung-Kun (Da-Ying-Cheng Investment Co., Ltd.) – Director and General Manager of Ta-Cheng Stainless Steel Industrial Co., Ltd. Director: Tsai Yung-Yu – Chairman of Chin-Ho Enterprise Co., Ltd. Director: Tsai Chao-Chin – Chairman of Fang-Sheng Screw Co., Ltd. Director: Ou I-Lan (Li-Chih Investment Co., Ltd.) – Chairman of Li-Chi Industrial Co., Ltd. Director: Hsieh Ni-I – Director of Ta-Cheng Stainless Steel Industrial Co., Ltd. Director: Tu Shih-Hsien – Vice President of Ta-Cheng International (USA) Director: Lin Mei-Feng (Taipei City Lin Fang-Chin Social Welfare & Charity Foundation) – Director of Ta-Cheng Stainless Steel Industrial Co., Ltd. Independent Director: Lan Hsien-Ming – Former General Manager / Chairman of China Steel Aluminum Co., Ltd. Independent Director: Liang Chi-Yen – Member of Compensation Committee, Shin-Kuang Textile Co., Ltd. Independent Director: Lee Pei-Ling – Founder of Taipei Private Wen-Tsai Smart Academic Tutoring Center Independent Director: Fang Yen-Ting – Director, JSTK Advisory LLC (USA)

7. Nature of Change (please enter 'resignation', 'dismissal', 'term expiration', 'deceased', or 'new appointment'): term expiration

8. Reason for Change: Board re-election due to term expiration

9. Shareholding of Newly Appointed Directors at Time of Election: Director: Hsieh Li-Yun (Wei-Yi Investment Co., Ltd.) – 196,430 shares Director: Hsieh Jung-Kun (Da-Ying-Cheng Investment Co., Ltd.) – 95,101,808 shares Director: Tsai Yung-Yu – 1,770,618 shares Director: Tsai Chao-Chin – 4,097,180 shares Director: Ou I-Lan (Li-Chih Investment Co., Ltd.) – 466,989 shares Director: Hsieh Ni-I – 1,126,552 shares Director: Tu Shih-Hsien – 8,046,716 shares Director: Lin Mei-Feng (Taipei City Lin Fang-Chin Social Welfare & Charity Foundation) – 2,580,156 shares Independent Director: Lan Hsien-Ming – 0 shares Independent Director: Liang Chi-Yen – 0 shares Independent Director: Lee Pei-Ling – 0 shares Independent Director: Fang Yen-Ting – 0 shares

10. Previous Term (e.g., xx/xx/xx ~ xx/xx/xx): 112/06/26 ~ 115/06/25

11. Effective Date of New Appointments: 115/06/16

12. Director Turnover Rate within Same Term: Not applicable

13. Independent Director Turnover Rate within Same Term: Not applicable

14. Supervisor Turnover Rate within Same Term: Not applicable

15. Is the change in directors one-third or more (yes or no): no

16. Other Matters to be Clarified (if the subject is a publicly issued company, this information also qualifies as a material event under Article 7, Paragraph 6 of the Enforcement Rules of the Securities and Exchange Act that significantly affects shareholders' rights or stock prices): none