POSCO HOLDINGS (PKX) details fatal site accident and lining work halt

Rhea-AI Filing Summary

POSCO HOLDINGS INC. reported a serious industrial accident at a construction site of its subsidiary POSCO E&C on the Shinansan Line Section 4-2. A reinforcing bar installed at the top of a tunnel fell and struck workers, causing one fatality and two injuries on December 18, 2025. The incident was reported to the Ministry of Employment and Labor on the same day.

A site inspection was conducted by the police and the Ministry of Employment and Labor, and the company states it will establish measures to prevent recurrence. On December 18, 2025, the Seoul Regional Employment and Labor Office, Seoul Southern Branch, issued a partial work suspension order covering all lining operations in Section 4-2, which is highlighted as information to be considered for investment decisions.

Insights

Industrial safety and regulatory risk analyst

POSCO reports a fatal site accident and faces a targeted work suspension.

POSCO HOLDINGS INC. discloses a serious industrial accident at POSCO E&C’s Shinansan Line Section 4-2 site, where a falling reinforcing bar in a tunnel caused one death and two injuries on December 18, 2025. This points to operational risk in construction activities, particularly in tunnel and heavy structural work.

Authorities reacted quickly: the incident was reported to the Ministry of Employment and Labor on the same day, followed by a site inspection by the police and the Ministry. The Seoul Regional Employment and Labor Office, Seoul Southern Branch, issued a partial work suspension order for all lining operations in Section 4-2, indicating regulatory scrutiny focused on that phase of the project.

The company states it will establish measures to prevent recurrence, but the specific scope, cost, or timing of these measures is not detailed in the excerpt. Any extended suspension or mandated changes could influence schedules or costs for this project, so future disclosures in company communications or filings would clarify operational and financial implications.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15D-16 UNDER

THE SECURITIES EXCHANGE ACT OF 1934

For the month of December, 2025

Commission File Number: 1-13368

POSCO HOLDINGS INC.

(Translation of registrant’s name into English)

POSCO Center, 440 Teheran-ro, Gangnam-gu, Seoul, Korea, 06194

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☒   Form 40-F ☐

Occurrence of a Serious Industrial Accident

(Disclosure of POSCO HOLDINGS’ Subsidiary Company POSCO E&C)

		1. Details of the Serious Accident		Location of Occurrence		Shinansan Line Section 4-2
				Description of Accident		A worker below was struck by a falling reinforcing bar installed at the top of the tunnel
				Number of Fatalities		1
				Number of the Injured		2
		2. Date of Occurrence of Serious Industrial Accident				December 18, 2025
		3. Date of Report to the Ministry of Employment and Labor				December 18, 2025
		4. Measures Taken and Future Plans				A site inspection was conducted (by the police and the Ministry of Employment and Labor), and the Company will establish measures to prevent recurrence.
		5. Other important details to be considered for investment decisions				On December 18, 2025, the Seoul Regional Employment and Labor Office, Seoul Southern Branch, issued a partial work suspension order for all lining operations in Section 4-2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

						POSCO HOLDINGS INC.
						(Registrant)
Date: December 19 , 2025				By		/s/ Han, Young-Ah
						(Signature)
						Name: Han, Young-Ah
						Title: Senior Vice President

FAQ

What serious industrial accident did POSCO HOLDINGS INC. (PKX) report?

POSCO HOLDINGS INC. reported that at POSCO E&C’s Shinansan Line Section 4-2 site, a reinforcing bar installed at the top of a tunnel fell and struck workers, resulting in one fatality and two injuries.

When did the POSCO (PKX) industrial accident occur and when was it reported?

The serious industrial accident occurred on December 18, 2025, and it was reported to the Ministry of Employment and Labor on the same date.

What regulatory action was taken after the POSCO E&C accident?

On December 18, 2025, the Seoul Regional Employment and Labor Office, Seoul Southern Branch, issued a partial work suspension order covering all lining operations in Section 4-2 of the Shinansan Line.

What measures does POSCO plan after the Shinansan Line Section 4-2 accident?

The company states that a site inspection was conducted by the police and the Ministry of Employment and Labor, and that it will establish measures to prevent recurrence of such accidents.

Which POSCO subsidiary was involved in the reported serious industrial accident?

The accident occurred at a site operated by POSCO E&C, a subsidiary of POSCO HOLDINGS INC., specifically on the Shinansan Line Section 4-2 project.

Why is the POSCO (PKX) accident disclosure relevant for investment decisions?

The company highlights that the Seoul Regional Employment and Labor Office issued a partial work suspension order for all lining operations in Section 4-2, noting this as information to be considered for investment decisions.