POSCO HOLDINGS INC. - Report of Foreign Private Issuer

On December 18, 2025, a serious industrial accident occurred at the Shinansan Line Section 4-2 site, resulting in one fatality and two injuries. A worker was struck by a falling reinforcing bar. The incident was reported to the Ministry of Employment and Labor on the same day. A partial work suspension order for all lining operations in Section 4-2 was issued by the Seoul Regional Employment and Labor Office. The company, POSCO E&C, has stated that site inspections were conducted by relevant authorities and that measures to prevent recurrence will be established. This report is filed by POSCO HOLDINGS INC. as a foreign private issuer.