Fatal accident at POSCO Holdings (PKX) POSCO E&C Shinansan Line site

Rhea-AI Filing Summary

POSCO HOLDINGS INC. reported a serious industrial accident at its subsidiary POSCO E&C’s Shinansan Line Section 3-2 construction site. One worker died after a fall from height in a vertical shaft during electrical work preparation, with the cause still under investigation.

The accident occurred and was reported to the Ministry of Employment and Labor on June 9, 2026. Authorities have completed site inspections, and accident prevention measures are being prepared. The Seoul Regional Employment and Labor Office (Gwanak Branch) issued a partial work suspension order for all vertical cable lining operations in Section 3-2.

Key Figures

Fatalities: 1 fatality Injuries: 0 injured Accident date: June 9, 2026 +2 more

5 metrics

Fatalities 1 fatality Serious industrial accident at Shinansan Line Section 3-2

Injuries 0 injured Serious industrial accident at Shinansan Line Section 3-2

Accident date June 9, 2026 Date of occurrence of serious industrial accident

Report date June 9, 2026 Reported to Ministry of Employment and Labor

Work suspension scope Section 3-2 vertical cable lining Partial work suspension order issued June 9, 2026

Key Terms

Serious industrial accident, Ministry of Employment and Labor, partial work suspension order, Seoul Regional Employment and Labor Office (Gwanak Branch)

4 terms

Serious industrial accident regulatory

"Occurrence of a Serious Industrial Accident (Disclosure of POSCO HOLDINGS’ Subsidiary Company POSCO E&C)"

Ministry of Employment and Labor regulatory

"Date of Report to the Ministry of Employment and Labor | | June 9, 2026"

partial work suspension order regulatory

"issued a partial work suspension order in Section 3-2 for all vertical cable lining operations"

Seoul Regional Employment and Labor Office (Gwanak Branch) regulatory

"the Seoul Regional Employment and Labor Office (Gwanak Branch) issued a partial work suspension order"

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Form 6-K: How Foreign Companies Report to the SEC →

Available on EDGAR 06/10/2026 - 06:04 AM Accepted by SEC EDGAR 06/10/2026 - 06:04 AM Learn about SEC filing dates

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 June, 2026

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 3-2
		Description of Accident		Fall from height during electrical work preparation in a vertical shaft; cause of the fall has yet to be identified.
		Number of Fatalities		1
		Number of the Injured		0
2. Date of Occurrence of Serious Industrial Accident				June 9, 2026
3. Date of Report to the Ministry of Employment and Labor				June 9, 2026
4. Measures Taken and Future Plans				Site inspections have been completed by the police and the Ministry of Employment and Labor. Accident prevention measures are being written to prevent recurrence of serious incidents.
5. Other important details to be considered for investment decisions				On June 9, 2026, the Seoul Regional Employment and Labor Office (Gwanak Branch) issued a partial work suspension order in Section 3-2 for all vertical cable lining operations.

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:		June 10, 2026				By		/s/ Han, Young Ah
								(Signature)
								Name: Han, Young Ah
								Title: Executive Vice President

FAQ

What serious industrial accident did POSCO HOLDINGS (PKX) disclose in this 6-K?

POSCO HOLDINGS disclosed a serious industrial accident at POSCO E&C’s Shinansan Line Section 3-2 site, where one worker died after falling from height in a vertical shaft during electrical work preparation. The exact cause of the fall has not yet been identified.

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

The accident occurred on June 9, 2026, at the Shinansan Line Section 3-2 site. It was reported the same day to the Ministry of Employment and Labor, indicating prompt regulatory notification following the fatal incident at POSCO HOLDINGS’ subsidiary POSCO E&C.

How many fatalities and injuries resulted from the POSCO HOLDINGS (PKX) accident?

The disclosed accident resulted in one fatality and no injuries. A worker died after falling from height during electrical work preparation in a vertical shaft, highlighting the severity of the incident despite the absence of additional injured personnel reported by POSCO HOLDINGS.

What regulatory action followed the POSCO HOLDINGS (PKX) industrial accident?

On June 9, 2026, the Seoul Regional Employment and Labor Office (Gwanak Branch) issued a partial work suspension order. The order applies to all vertical cable lining operations in Section 3-2, directly affecting ongoing activities at the Shinansan Line construction site.

What measures is POSCO HOLDINGS (PKX) taking after the serious industrial accident?

Site inspections by police and the Ministry of Employment and Labor have been completed. POSCO HOLDINGS states that accident prevention measures are being drafted to prevent recurrence of similar serious incidents, focusing on safety improvements following the fatal fall at POSCO E&C’s worksite.

Which POSCO HOLDINGS (PKX) subsidiary and project section were involved in the accident?

The accident involved POSCO HOLDINGS’ subsidiary POSCO E&C at the Shinansan Line Section 3-2. This section is specifically referenced as the location of the fatal fall and is also the focus of the subsequent partial work suspension order on vertical cable lining operations.