POSCO Holdings Inc. approved appointment of CHUNG, Seok Mo as Inside Director. Date of birth is November 3, 1966. Professional Experience: 2025.12~ (Present) Head, Business Synergy Division (Sr. EVP), POSCO HOLDINGS INC., 2025.1 (Former) Head, Industrial Gas Business Unit (EVP), POSCO & (concurrently) President, POSCO ZHONGTAI AIR SOLUTION, 2022.2 (Former) Head, Industrial Gas Business TF Team (EVP), POSCO, 2020.1 (Former) Head, Secondary Battery Materials Business Office (Sr. VP), POSCO and 2018.1 (Former) President, eNtoB.

Team is 1 Year. the company also appointed KIM, Jooyoun as Outside Director. Date of birth is June 29, 1967.

Professional Experience: 2023~ (Present) Outside Director, SK Innovation Co. Ltd., 2019~2022 (Former) Vice Chair, P&G Korea/Japan & Global Chief Marketing Officer, P&G Grooming, 2018~2019 (Former) Vice President, P&G Gillette Asia. 2016~2018 (Former) CEO, P&G Korea, 2012~2015 (Former) Marketing Director, P&G Asia-Pacific India, 2011~2012 (Former) Global Brand Franchise Leader, P&G and 2005~2010 (Former) Marketing Director, P&G Korea.