Sumiseki Holdings Inc

This article is part of the
Ownership Project at
Global Energy Monitor which includes ownership data on


Coal Plants,

Oil and Gas Plants, 

Bioenergy Plants,

Coal Mines,

Iron and Steel Plants,

Iron Ore Mines,

Cement and Concrete,

Chemicals,

Oil and NGL Pipelines, and

Gas Pipelines,

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Sumiseki Holdings Inc (住石ホールディングス株式会社) is a legal entity registered in Japan, with headquarters in Tôkyô [Tokyo], Japan.

This entity is publicly listed, and it is not the result of a joint venture.

Table 1: Organization identifiers


ID Scheme	Code	ID data source
Global Energy Monitor (GEM)	E100001000882	–
Global Legal Entity Identifier Index	not found	–
PermID: Refinitiv Permanent Identifier	4298077477	^[1]
S&P Capital IQ	47864925	–

Ownership Structure

Direct Ownership

Table 2: Direct ownership


Entity	Percentage / Percentage range
ASO	56.9^[2]
The Master Trust Bank of Japan	5.1^[2]
small shareholder(s)	37.9^[2]

Ultimate Beneficial Ownership

Table 3: Ultimate beneficial ownership


GEM ID	Entity	Country
E100000123261	natural persons	N/A
E100001015587	small shareholders	N/A
E100001010595	The Vanguard Group	United States
E100001015833	Blackrock Advisors	United States
E100001016257	Asahi Mutual Life Insurance	Japan
E100002001974	member/employee owned	–
E100002005080	ASO	Japan

Intermediate Entities

Sumiseki Holdings has 17 intermediate entities, which can be found here.

Direct Subsidiaries

Table 4: Direct subsidiaries


GEM ID	Entity	Country/Area
E100001000877	Wambo Coal	Australia
E100001000880	Sumiseki Materials	Japan
E100001000884	United Wambo Joint Venture	Australia

Asset Ownership

Table 5: Owned assets


Project	Asset type	Country/Area	Status	GEM tracker
United Wambo Coal Mine	Coal Mine	Australia	operating	GCMT
Wambo Underground Coal Mine	Coal Mine	Australia	operating	GCMT

Articles and Resources

Additional data

To access additional data, including a downloadable dataset, summary data, and interactive tools, please visit the Global Energy Ownership Tracker on the Global Energy Monitor website.

References

↑ https://permid.org/1-4298077477. {{cite web}}: Missing or empty |title= (help)
↑ ^2.0 ^2.1 ^2.2 "株式情報 - 株式概要｜住石ホールディングス株式会社". www.sumiseki.co.jp. Archived from the original on 2026-03-16. Retrieved 2025-07-09.

[autoref_0-1] ttps://permid.org/1-4298077477. {{cite web}}: Missing or empty |title= (help)

[autoref_1-2] 2.0 ^2.1 ^2.2 "株式情報 - 株式概要｜住石ホールディングス株式会社". www.sumiseki.co.jp. Archived from the original on 2026-03-16. Retrieved 2025-07-09.

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