OIO Holdings Ltd. is an investment holding company, which engages in the provision of engineering services and solutions. It operates through the following segments: Mechanical and Electrical Engineering Services; Turnkey Contracting Services; Management Services; and Blockchain Agency and Consulting Services. The Mechanical and Electrical Engineering Services segment relates to offering of solutions and services in fire protection systems, plumbing and sanitary systems, and heating, ventilation, and air-conditioning systems. The Turnkey Contracting Services segment includes one-stop solutions and services for the entire span of a construction project from planning and design, coordination and supervision, and implementation. The Managements Services segment comprised of contract work management and fulfilment services. The Blockchain Agency and Consulting Services focuses to sales agency services to blockchain companies in respect of their blockchain-related products and services, software development outsource agency services. The company was founded by Chi Seng Fan on September 13, 2017 and is headquartered in Singapore.