6-K: POSCO subsidiary incident at stainless steel plant in Pohang

Rhea-AI Filing Summary

POSCO Holdings reported a serious industrial accident at a subsidiary facility. The incident occurred at the stainless steel annealing and pickling plant in Pohang Works and involved presumed inhalation of acidic fumes from a pipe leak while moving between work areas. The accident resulted in 1 fatality and 3 injured on November 5, 2025.

The company reported the incident to the Ministry of Employment and Labor on the same day. A site inspection was conducted by the police and the Ministry, and the company stated it will establish measures to prevent recurrence.

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Accepted by SEC EDGAR 11/05/2025 - 06:03 AM Learn about SEC filing dates

FAQ

What did POSCO Holdings (PKX) disclose in this 6-K?

The company reported a serious industrial accident at a subsidiary’s stainless steel annealing and pickling plant in Pohang Works with 1 fatality and 3 injured.

Where did the POSCO Holdings (PKX) incident occur?

At the stainless steel annealing and pickling plant located at Pohang Works.

How many casualties were reported by POSCO Holdings (PKX)?

The incident resulted in 1 fatality and 3 injured.

When did the POSCO Holdings (PKX) accident occur?

The accident occurred on November 5, 2025.

When was the incident reported to authorities by POSCO Holdings (PKX)?

It was reported to the Ministry of Employment and Labor on November 5, 2025.

What steps did POSCO Holdings (PKX) say it is taking?

Police and Ministry inspections were conducted, and the company will establish measures to prevent recurrence.

Which POSCO Holdings (PKX) entity was involved?

The disclosure pertains to subsidiary POSCODX.

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 November, 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 POSCODX)

1. Details of the Serious Accident		Location of Occurrence		Stainless Steel Annealing and Pickling Plant at Pohang Works
		Description of Accident		Inhalation of acidic fumes from a pipe leak while moving between work areas (presumed)
		Number of Fatalities		1
		Number of the Injured		3
2. Date of Occurrence of Serious Industrial Accident				November 5, 2025
3. Date of Report to the Ministry of Employment and Labor				November 5, 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.

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: November 5 , 2025				By		/s/ Han, Young-Ah
						(Signature)
						Name: Han, Young-Ah
						Title: Senior Vice President