Taisei Steel Announces Results of 2026 Shareholder Meeting: Board of Directors (Including Independent Directors) Re-Election List (Corrected Shareholding at Time of Appointment)

1. Date of Change: 2026/06/16

2. Category of Appointed or Changed Personnel (please select from: corporate director, corporate supervisor, independent director, individual director, or individual supervisor): Corporate Director, Individual Director, Independent Director

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

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

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

8. Reason for Change: Re-election due to end of term

9. Shareholding at Time of Appointment for New Appointees: Director: Hsieh Li-Yun, representative of Wei-Yi Investment Co., Ltd. (196,430 shares) Director: Hsieh Jung-Kun, representative of Da-Ying-Cheng Investment Co., Ltd. (95,101,808 shares) Director: Tsai Yung-Yu (1,719,618 shares) Director: Tsai Chao-Chin (4,097,180 shares) Director: Ou I-Lan, representative of 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, representative of Taipei City Lin Fang-Chin Social Welfare & Charity Foundation (2,607,156 shares) Independent Director: Lan Hsien-Ming (83,984 shares) Independent Director: Liang Chi-Yen (0 shares) Independent Director: Lee Pei-Ling (0 shares) Independent Director: Fang Yen-Ting (0 shares)

10. Original Term (e.g., xx/xx/xx ~ xx/xx/xx): 2023/06/26 ~ 2026/06/25

11. Effective Date of New Appointees: 2026/06/16

12. Director Turnover Rate During Same Term: Not applicable

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

14. Supervisor Turnover Rate During 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 significant information also meets Article 7, Paragraph 6 of the Enforcement Rules of the Securities and Exchange Act regarding matters significantly affecting shareholder rights or securities prices): None