Cosmo Energy Holdings Co Ltd (Cosmo Energy) is primarily engaged in various business sectors including the petroleum business, petrochemical business, oil development business, and renewable energy business. The company and its consolidated subsidiaries operate as independent management units based on the products and services. The company also has a presence in the car leasing business for individuals.

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Cosmo Energy’s R&D arm focuses on research and development initiatives across its subsidiaries. Through Cosmo Oil Co Ltd, the company is focused on strengthening competitiveness in the petroleum refining field and conducts research in the petrochemical field, petroleum development field, and corporate research field. Cosmo Oil Lubricants Co Ltd works towards developing environmentally friendly lubricants and heat dissipation materials. Maruzen Petrochemical Co Ltd focuses on strengthening and expanding existing businesses and developing products and technologies that contribute to carbon neutrality. In FY2025, the company incurred a research and development expenditure of JPY5,243 million which was 0.2% of the company’s total revenue.