Reporting Period
April 1, 2025 to March 31, 2026
Although this report covers activities in fiscal 2025, some information may be more recent. Some of the information may be from activities reported in FY2024, prior to the update.
Reporting Scope
This report covers Cosmo Energy Holdings Co., Ltd., Cosmo Oil, Cosmo Oil Marketing, Cosmo Energy Exploration & Production, Maruzen Petrochemical, as well as 47 subsidiaries.
The Group’s core operating companies are Cosmo Oil, Cosmo Oil Marketing, and Cosmo Energy Exploration & Production, and its semi-core operating company is Maruzen Petrochemical.
Companies directly managed by Cosmo Energy Holdings
However, some of the data in the report applies only to employees of Cosmo Oil, the core operating companies, or certain Group companies. In such cases, details are provided in footnotes.
Report Issuance and Website Updates
Cosmo Report
November 2025; Previous report: October 2024; Next publication scheduled: Around November 2026 (published annually)
Sustainability website
May to November2026; Previous update: Juneto November 2025 Next update scheduled: June to November 2027 (updated annually)
The Cosmo Report, plus IR andSustainability Websites
The Cosmo Report (PDF booklet edition) is designed for easy reading, and more details are available on the Group’s IR and sustainability pages.
In editing, we focus on priority issues with reference to the GRI Standards from the Global Reporting Initiative.
Contact Information
Sustainability Initiative Department, Cosmo Energy Holdings Co., Ltd.
Email: cosmo_csr@cosmo-oil.co.jp
Please share your thoughts with us about the Cosmo Report, our sustainability website, and the Cosmo Energy Group's sustainability initiatives.
Cosmo Energy Holdings and Group Companies Covered by the Consolidated Medium-Term Management Plan
Companies Directly Managed by Cosmo Energy Holdings (as of March 31, 2026)
Holding Company
Cosmo Energy Holdings Co., Ltd.
Core Operating Companies
| Cosmo Energy Exploration & Production Co., Ltd. | Planning in the energy exploration and production business |
|---|---|
| Cosmo Oil Co., Ltd. | Imports and exports, refining, storage, and sales of crude oil and petroleum products |
| Cosmo Oil Marketing Co., Ltd. | Sales of oil products, vehicle leasing and low-carbon solutions (including green energy supply) |
Semi-Core Operating Company
| Maruzen Petrochemical Co., Ltd. | Production and sales of petrochemical |
|---|
Affiliates of Cosmo Energy Exploration & Production Co., Ltd.
| Abu Dhabi Oil Co., Ltd. | Exploration, production, and sales of crude oil |
|---|---|
| Qatar Petroleum Development Co., Ltd. | Operator involved in crude oil exploration and production |
| Cosmo E&P Albahriya Limited | Exploration and survey of crude oil, natural gas, and other mineral resources |
| Cosmo E&P USA Inc. | Lithium Resource Exploration and Production |
Affiliates of Cosmo Oil Co., Ltd.
| Cosmo Matsuyama Oil Co., Ltd. | Manufacture and sale of petroleum and petrochemical products |
|---|---|
| CM Aromatics Co., Ltd. | Manufacture and sale of petrochemical products |
| Hokuto Kogyo Co., Ltd. | Operations within logistics sites, transportation and sales of petroleum products, as well as construction and installation contracts |
| Cosmo Kaiun Co., Ltd. | Marine transport of petroleum products |
| Cosmo Petro Service Co., Ltd. | Refinery onsite operations |
| Cosmo Techno Yokkaichi Co., Ltd. | Refinery onsite operations and transport |
| Cosmo Refinery Support Sakai Co., Ltd. | Refinery onsite operations |
| Sakaide Cosmo Kosan Co., Ltd. | Logistics site operations |
| Cosmo Oil International Pte. Ltd. | Import and Export of Crude Oil and Petroleum Products |
| Cosmo Oil of U.S.A. Inc. | Import and Export of Crude Oil and Petroleum Products |
| Kitagas Fureasuto Hakodate Minami Co., Ltd. | Sales, Repair, and Inspection of Gas Appliances |
| Chiba Cosmo Koun Co., Ltd. | Ship agency services |
| Saffaire Sky Energy, LLC | Manufacture and sale of biojet fuel, bionaphtha, and biodiesel |
Affiliates of Cosmo Oil Marketing Co., Ltd.
| Cosmo Oil Sales Corporation | Sales of petroleum products and operation of service stations |
|---|---|
| Cosmo Energy Solutions Co., Ltd. | Sales of petroleum products, retail electricity, and environmental products |
| Cosmo Oil Property Service Co., Ltd. | Real Estate Management Related to Petroleum Product Sales |
| Osadano Gas Center Co., Ltd. | Supply and sales of municipal gas |
| Tocos Car Support Corporation | Contract Management of Self-Service Stations |
| Cosmo Reform Co., Ltd. | Construction, Renovation, etc. |
| Amtecs Co., Ltd. | Sales of Automotive Maintenance Equipment |
Affiliates of Maruzen Petrochemical Co., Ltd.
| Keiyo Ethylene Co., Ltd. | Manufacturing of basic petrochemical products such as ethylene and propylene |
|---|---|
| Maruzen Chemical Trading Co., Ltd. | Petrochemicals, specialty chemicals, containers and packaging materials, etc. |
| Sunplac Corporation | Manufacture and sale of polyolefins and plastic products |
| Sunplac Thailand Co.,Ltd. | Manufacture and sales of plastic products |
| Maruzen America Inc. | Sales and technical service agency for export products |
Other subsidiaries
| Cosmo Oil Lubricants Co., Ltd. | Research, manufacturing, and sales of lubricating oils and greases |
|---|---|
| Cosmo Lube Service Co., Ltd. | Operations within a lubricant manufacturing plant |
| CEAM LLC | Acquisition, Ownership, and Disposal of Real Estate |
| Cosmo Engineering Co., Ltd. | Comprehensive Engineering Services for Plant Facilities |
| Cosmo Iwatani Hydrogen Engineering LLC | Engineering Services for Hydrogen-Related Projects |
| Cosmo Trade & Service Co., Ltd. | Insurance Agency Business and Car Care Product Sales |
| SUMMIT TRADING CO.,Ltd. | Catering, sale of Japanese food products |
| MUSASHI INTERNATIONAL CO.(W.L.L) | Sales of Japanese food, daily necessities, and other items |
| JMG Trading Sdn. Bhd. | Import and wholesale of Japanese food |
| Cosmo Business Associates Co., Ltd. | Outsourcing services for accounting, finance, purchasing, general affairs, and human resources |
| Cosmo Oil Europe B.V. | Business development support and business investment outside Japan |
| Cosmo Eco Power Co., Ltd. | Wind power generation business |
| Ikata Eco Park Co., Ltd. | Wind power generation business |
| Sasebo City Shikamachi-cho Wind Power LLC | Wind power generation business |