OIO Holdings Limited, an investment holding company, provides blockchain technology services in Singapore and internationally. It operates through two segments, Mechanical and Electrical Engineering Services and Blockchain Technology Services. The Mechanical and Electrical Services segment provides solutions and services in the areas of fire protection systems, plumbing and sanitary systems, as well as heating, ventilation, and air-conditioning systems. This segment serves main contractors, property developers, luxury hotels, statutory boards, listed companies, and government bodies. The Blockchain Technology Services segment provides blockchain agency and consulting services, which include sales agency services and software development outsource agency services to blockchain companies; and staking services, which include digital wallets and staking services to retail customers, as well as research and development services to enterprise customers. It also involves in the procurement of equipment and components, such as offloading hoses, as well as provision of logistic services to offshore oil rigs; construction of buildings; installation of industrial machinery and equipment; and property owing activities, as well as provision of mechanical engineering works. The company was formerly known as DLF Holdings Limited and changed its name to OIO Holdings Limited in July 2020. OIO Holdings Limited was founded in 1999 and is based in Singapore.