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OCI Holdings Company Ltd. is a holding company established in May 2023 to enhance the transparency of the OCI Holdings’ governance structure and corporate value. OCI Holdings has established a governance system to facilitate prompt and professional decision-making according to the characteristics of each of its business companies with the focus on improving the competitiveness of the main business company.

OCI Company Ltd. specializes in the chemical industry, established in May 2023 through a spin-off of all chemical-related operations managed by OCI Holdings.

OCI SE Co., Ltd. utilizes its advanced operational expertise and exceptional energy efficiency to supply high-quality energy to tennants within the Saemangeum Industrial Complex at competitive prices.

Established in 2012, OCI Power Co., Ltd. specializes in the photovoltaic (PV) business. It provides a one-stop total service encompassing business development and acquisition, financing, design, construction, management and operation of PV projects.

Established in 1997, OCI Information & Communications Co., Ltd. leverages its extensive experience in ERP implementation to offer optimal operational services tailored to customer needs, including operational improvement consulting and IT training.

OCI Dream Co., Ltd. is a subsidiary-type standard workplace for individuals with disabilities. It aims to provide high-quality employment opportunities for people with both severe and mild disabilities, promoting economic independence and contributing to the creation of healthy social value.

Established in 2008, DCRE Co., Ltd. launched the 'CITYOCIEL' project and is currently promoting a large-scale urban development initiative to redevelop Incheon Yonghyeon-Hakik Block 1, located at the site of OCI’s former Incheon Plant.

OCI-Ferro Co., Ltd. is a foreign-invested company (joint investment between OCI Holdings Co., Ltd. and Ferro Corp. in the U.S.) specializing in ceramic materials and importation/sales of frit, a ceramic material used for architectural and industrial purposes, and black enamel and silver paste for automobiles.

OCI Specialty Co., Ltd. supplies key materials for green energy, including slim rods for polysilicon and wafers for solar cells. Through continuous innovation and research and development, the company is advancing to become a global leader in the green energy materials industry.

Bukwang Pharm Co., Ltd. established in 1960, is a research and development-centric pharmaceutical company with a strong foundation in drug research, development, production, and marketing. Currently, it has established diverse global partnerships with over 30 overseas companies.