O.K. Isokariari Nigeria Limited (O.K.I) is an engineering, procurement, and construction (EPC) firm established in 1972. The company specialises in civil engineering and building projects, providing services such as turnkey project delivery, geotechnical investigation, and the construction of buildings, roads, and bridges. It also manufactures reinforced concrete products, including precast beams, slabs, and culverts.
Headquartered in Port Harcourt, Rivers State, O.K.I operates an office in Abuja, FCT. The company states that it has completed projects across Nigeria and serves clients in sectors including oil and gas, construction, and infrastructure. Its management team includes roles such as Managing Director, General Manager for Engineering, and Contract Manager.



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