OIO Holdings Ltd. is an investment holding company. It operates through the following segments: Mechanical and Electrical Engineering Services, Management Services, and Blockchain Technology Services. The Mechanical and Electrical Engineering Services segment includes solutions and services in fire protection systems; plumbing and sanitary systems; and heating, ventilation, and air-conditioning systems. The Management Services segment provides contract work management and fulfillment services. The Blockchain Technology Services segment focuses on blockchain agency, consulting, and staking services. The company was founded by Chi Seng Fan on September 13, 2017 and is headquartered in Singapore.