Exhibit 99.1 Corporate Governance Report Disclosure [000001] Corporate Governance Report Corporate governance report document Corporate Governance Report Form ATTN: Korea Exchange (KRX) Pursuant to Article 24-2 of the KOSPI Market Disclosure Regulations and Article 7-2 of its Enforcement Rules, POSCO HOLDINGS hereby submits its Corporate Governance Report. The Company affirms that this report contains no false statements or omissions of material facts. May 30, 2025 Lee, Ju Tae President & Representative Dir ...