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Related Party Transactions

12 Months Ended

Dec. 31, 2025

TextBlock 1 [Abstract]

Related Party Transactions

37. Related Party Transactions

(a) Related parties of the Company as of December 31, 2025 are as follows:

Type		Company
Investments in associates and joint ventures		[Domestic] POSCO MC MATERIALS, Samcheok Blue Power Co.,Ltd., SNNC and others.
		[Foreign] Roy Hill Holdings Pty Ltd, POSCO-NPS Niobium LLC, KOBRASCO, PT NICOLE METAL INDUSTRY, HBIS-POSCO Automotive Steel Co.,Ltd, South-East Asia Gas Pipeline Company Ltd., 9404-5515 Quebec Inc., KOREA LNG LTD., Nickel Mining Company SAS and others.

(b) Significant transactions between the Company and its related parties for the years ended December 31, 2023, 2024 and 2025 are as follows:

1) For the year ended December 31, 2023

(in millions of Won)		Sales and others								Purchase and others
		Sales				Dividends				Others				Purchase of material				Others
Associates and joint ventures(*1)
New Songdo International City Development, LLC		￦	208,536				—				1,484				—				279
SNNC			164,827				—				87				637,638				1,749
Noeul Green Energy Co., Ltd.			6,499				—				28				—				10,320
POS-SEAH STEEL WIRE(TIANJIN)CO.,Ltd			14,477				—				—				—				—
POS-SeAH Steel Wire(Nantong) Co., Ltd.			43,811				—				—				73				—
South-East Asia Gas Pipeline Company Ltd.			—				59,295				—				—				—
POSCO MC MATERIALS			113,542				9,000				—				6,861				1,564
Samcheok Blue Power Co., Ltd.			503,283				10,020				—				—				—
Pocheon-Hwado Highway Corp.			160,233				—				—				—				—
Roy Hill Holdings Pty Ltd			—				367,445				—				1,611,073				—
Others			474,846				212,578				14,970				590,717				102,067
		￦	1,690,054				658,338				16,569				2,846,362				115,979

(*1) As of December 31, 2023, the Company provided guarantees to related parties.

2) For the year ended December 31, 2024

(in millions of Won)		Sales and others												Purchase and others
		Sales				Dividends				Others				Purchase of material				Others
Associates and joint ventures(*1)
New Songdo International City Development, LLC		￦	216,657				—				1,427				—				145
SNNC			121,658				—				8				377,168				3,620
POSCO-SAMSUNG-SLOVAKIA PROCESSING CENTER			43,098				—				—				781				—
Gyeonggi Green Energy Co., Ltd.			31,036				—				—				—				6,675
POS-SEAH STEEL WIRE(TIANJIN)CO.,Ltd			13,733				—				—				—				—
POS SeAH Steel Wire(Nantong) Co., Ltd.			52,993				—				—				243				—
South-East Asia Gas Pipeline Company Ltd.			—				64,208				—				—				—
POSCO MC MATERIALS			137,209				1,800				—				8,107				526
Samcheok Blue Power Co., Ltd.			377,636				10,993				946				—				—
Pocheon-Hwado Highway Corp.			59,691				—				—				—				65
HBIS-POSCO Automotive Steel Co., Ltd			41,369				—				—				37,241				—
Roy Hill Holdings Pty Ltd			—				284,541				260				1,729,832				—
Others			421,095				149,647				4,434				520,477				255,084
		￦	1,516,175				511,189				7,075				2,673,849				266,115

(*1) As of December 31, 2024, the Company provided guarantees to related parties.

3) For the year ended December 31, 2025

(in millions of Won)		Sales and others(*1)												Purchase and others
		Sales				Dividends				Others				Purchase of material				Others
Associates and joint ventures
New Songdo International City Development, LLC		￦	52,814				—				48,449				—				54
SNNC			101,468				—				8				484,571				4,163
POSCO-SAMSUNG-SLOVAKIA PROCESSING CENTER			44,882				—				—				5				—
Gyeonggi Green Energy Co., Ltd.			7,103				—				—				—				3,438
POS-SEAH STEEL WIRE(TIANJIN)CO.,Ltd			13,185				—				—				—				—
POS SeAH Steel Wire(Nantong) Co., Ltd.			51,513				—				—				357				—
South-East Asia Gas Pipeline Company Ltd.			—				37,273				—				—				—
POSCO MC MATERIALS			132,097				3,000				—				6,913				820
Samcheok Blue Power Co., Ltd.			246,619				2,795				352				20				4
POSCO(Guangdong) Automotive Steel Co., Ltd			195,811				—				—				266,549				—
HBIS-POSCO Automotive Steel Co., Ltd			24,870				—				—				66,886				1,391
Roy Hill Holdings Pty Ltd			—				213,794				—				1,544,120				—
Others			224,899				119,247				2,051				447,364				42,945
		￦	1,095,261				376,109				50,860				2,816,785				52,815

(*1) As of December 31, 2025, the Company provided guarantees to related parties (see Note 38). 

(c) The balances of receivables and payables arising from significant transactions between the Company and its related parties as of December 31, 2024 and 2025 are as follows:

1) December 31, 2024

(in millions of Won)		Receivables(*1)																Payables
		Trade accounts and notes receivable				Loan				Others				Total				Trade accounts and notes payable				Others				Total
Associates and joint ventures
New Songdo International City Development, LLC		￦	96,730				—				1,657				98,387				—				30,087				30,087
Gyeonggi Green Energy Co., Ltd.			5,846				—				10,706				16,552				—				567				567
POSCO(Guangdong) Automotive Steel Co., Ltd			46,547				6,162				—				52,709				48,866				—				48,866
AMCI (WA) PTY LTD			—				142,767				—				142,767				—				—				—
HBIS-POSCO Automotive Steel Co.,Ltd			13,924				—				—				13,924				5,483				1,922				7,405
POS-SEAHSTEELWIRE(TIANJIN)CO.,Ltd			5,970				—				—				5,970				—				—				—
Samcheok Blue Power Co., Ltd.			189,173				—				148				189,321				—				77,187				77,187
Nickel Mining Company SAS			—				68,793				122				68,915				—				358				358
POS-SeAH Steel Wire(Nantong) Co., Ltd.			19,628				—				—				19,628				—				—				—
POSCO MC MATERIALS			14,544				—				168				14,712				1,314				357				1,671
Pocheon-Hwado Highway Corp.			10,985				—				—				10,985				—				—				—
UITrans LRT Co., Ltd.			13,592				51,051				9,187				73,830				—				—				—
Roy Hill Holdings Pty Ltd			25,023				—				8,836				33,859				356,234				25				356,259
SNNC			12,861				—				70				12,931				10,322				1,298				11,620
FQM Australia Holdings Pty Ltd			—				292,764				—				292,764				—				—				—
Others			27,728				19,730				138,239				185,697				10,168				10,129				20,297
		￦	482,551				581,267				169,133				1,232,951				432,387				121,930				554,317

(*1) As of December 31, 2024, the Company recognized an allowance for doubtful account for receivables above amounting to ￦506,673 million.

2) December 31, 2025

(in millions of Won)		Receivables(*1)																Payables
		Trade accounts and notes receivable				Loan				Others				Total				Trade accounts and notes payable				Others				Total
Associates and joint ventures
New Songdo International City Development, LLC		￦	25,497				—				10,100				35,597				—				4				4
Gyeonggi Green Energy Co., Ltd.			—				—				14,832				14,832				—				—				—
POSCO(Guangdong) Automotive Steel Co., Ltd			32,218				6,212				—				38,430				37,313				—				37,313
AMCI (WA) PTY LTD			—				136,580				—				136,580				—				—				—
HBIS-POSCO Automotive Steel Co.,Ltd			3,701				—				—				3,701				15,584				207				15,791
POS-SEAHSTEELWIRE(TIANJIN)CO.,Ltd			4,965				—				—				4,965				—				—				—
Samcheok Blue Power Co., Ltd.			273,880				—				193				274,073				—				381				381
Nickel Mining Company SAS			—				75,857				707				76,564				—				358				358
POS-SeAH Steel Wire(Nantong) Co., Ltd.			13,334				—				—				13,334				150				—				150
POSCO MC MATERIALS			10,838				—				358				11,196				894				506				1,400
Pocheon-Hwado Highway Corp.			5,491				—				—				5,491				—				2				2
UITrans LRT Co., Ltd.			—				39,333				4,214				43,547				—				—				—
Roy Hill Holdings Pty Ltd			39,761				—				9,610				49,371				426,829				—				426,829
SNNC			10,694				—				28,433				39,127				5,439				447				5,886
FQM Australia Holdings Pty Ltd			—				292,591				—				292,591				—				—				—
Others			27,327				21,995				138,447				187,769				49,756				71,663				121,419
		￦	447,706				572,568				206,894				1,227,168				535,965				73,568				609,533

(*1) As of December 31, 2025, the Company recognized an allowance for doubtful account for receivables above amounting to ￦531,031 million.

(d) Significant financial transactions between the Company and its related parties for the years ended December 31, 2023, 2024 and 2025 are as follows: 

1) For the year ended December 31, 2023

(in millions of Won)		Beginning				Lend				Collect				Others(*1)				Ending
Associates and joint ventures
UITrans LRT Co., Ltd.		￦	36,510				9,825				—				—				46,335
PT. Tanggamus Electric Power			5,014				—				(270	)			82				4,826
PT. Wampu Electric Power			3,988				—				(4,063	)			75				—
Nickel Mining Company SAS			63,024				—				(2,322	)			3,495				64,197
KRAKATAU POS-CHEM DONG-SUH CHEMICAL			3,802				—				(1,323	)			100				2,579
POS-SeAH Steel Wire (Thailand) Co., Ltd.			7,604				—				(7,828	)			224				—
AMCI (WA) PTY LTD			104,281				6,620				—				1,276				112,177
POS-AUSTEM WUHAN AUTOMOTIVE CO.,LTD			10,138				—				(5,321	)			341				5,158
Hyo-chun Co., Ltd.			2,382				—				—				—				2,382
POS-AUSTEM Suzhou Automotive Co., Ltd			12,673				—				(13,219	)			546				—
FQM Australia Holdings Pty Ltd			247,868				2,637				—				6,433				256,938
POHANG E&E Co. , LTD			100				1,546				—				—				1,646
POSCO(Guangdong) Automotive Steel Co., Ltd.			35,131				225,182				(246,259	)			278				14,332
		￦	532,515				245,810				(280,605	)			12,850				510,570

(*1) Includes adjustments of foreign currency translation differences and others.

2) For the year ended December 31, 2024

(in millions of Won)		Beginning				Lend				Collect				Others(*1)				Ending
Associates and joint ventures
UITrans LRT Co., Ltd.		￦	46,335				4,718				—				(2	)			51,051
PT. Tanggamus Electric Power			4,826				—				(1,288	)			316				3,854
Nickel Mining Company SAS			64,197				—				—				4,596				68,793
KRAKATAU POS-CHEM DONG-SUH CHEMICAL			2,579				—				(1,379	)			270				1,470
Hyo-chun Co., Ltd.			2,382				—				—				—				2,382
AMCI (WA) PTY LTD			112,177				6,499				—				24,091				142,767
POS-AUSTEM WUHAN AUTOMOTIVE CO.,LTD			5,158				—				—				478				5,636
FQM Australia Holdings Pty Ltd			256,938				3,126				—				32,700				292,764
POHANG E&E Co. , LTD			1,646				1,582				—				—				3,228
POSCO(Guangdong) Automotive Steel Co., Ltd.			14,332				59,402				(68,294	)			722				6,162
Gale International Korea, LLC			—				100				—				—				100
P&O Chemical Co., Ltd.			—				3,060				—				—				3,060
		￦	510,570				78,487				(70,961	)			63,171				581,267

(*1) Includes adjustments of foreign currency translation differences and others.

3) For the year ended December 31, 2025

(in millions of Won)		Beginning				Lend				Collect				Others(*1)				Ending
Associates and joint ventures
UITrans LRT Co., Ltd.		￦	51,051				—				(11,718	)			—				39,333
PT. Tanggamus Electric Power			3,854				—				(3,089	)			1,823				2,588
Nickel Mining Company SAS			68,793				—				—				7,064				75,857
KRAKATAU POS-CHEM DONG-SUH CHEMICAL			1,470				—				(1,435	)			(35	)			—
Hyo-chun Co., Ltd.			2,382				—				—				—				2,382
AMCI (WA) PTY LTD			142,767				73				(13,657	)			7,397				136,580
POS-AUSTEM WUHAN AUTOMOTIVE CO.,LTD			5,636				—				(5,733	)			97				—
FQM Australia Holdings Pty Ltd			292,764				—				—				(173	)			292,591
POHANG E&E Co. , LTD			3,228				1,444				—				—				4,672
POSCO(Guangdong) Automotive Steel Co., Ltd.			6,162				64,858				(64,914	)			106				6,212
Gale International Korea, LLC			100				344				—				—				444
P&O Chemical Co., Ltd.			3,060				—				—				(3,060	)			—
CAML			—				5,766				—				—				5,766
POS-AUSTEM Suzhou Automotive			—				6,143				—				—				6,143
		￦	581,267				78,628				(100,546	)			13,219				572,568

(*1) Includes adjustments of foreign currency translation differences and others.

(e) For the years ended December 31, 2024 and 2025, there were additional investments in associates and joint ventures and others amounting to ￦301,816 million and ￦213,279 million, respectively.

(f) For the years ended December 31, 2023, 2024 and 2025, details of compensation to the Company’s key management officers are as follows:

(in millions of Won)		2023				2024				2025
Short-term benefits		￦	199,608				190,253				163,545
Long-term benefits			9,641				9,858				3,056
Retirement benefits			38,934				29,261				24,829
		￦	248,183				229,372				191,430

Key management officers include directors (including non-standing directors), executive officers and fellow officers who have significant influences and responsibilities in the Company’s business and operations.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
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