Denchi Group Ltd, based in Caithness, is a leading supplier and manufacturer of battery systems to the defence, rail, marine, oil and gas and medical sectors, with interests in renewable hydrogen production, grid-scale battery storage and combined-energy vector management.

Dense Air is a Global wholesale wireless network operator providing 4G and 5G ‘Networks As a Service’ in licensed and unlicensed spectrum to MNO’s, MVNO’s, Fixed Network Operators and Private Enterprises.

DG Cities Ltd is the commercial smart cities arm of the Royal Borough of Greenwich. It enables the organisation to work flexibly with external partners in research consortia, local government, consultancy and other new business opportunities related to smart city development.

We provide an inclusive service for the development of software for infrastructure and utility organisations. We have a proven track record of delivering cost effective, reliable systems that help build and maintain assets.

Dialog Semiconductor is a leading provider of standard and custom integrated circuits (ICs) and other products that power the Internet of Things (IoT) and Industrial IoT applications.

Enabling smarter networks. Managed Services | System Integration | Consultancy We transform telecom networks, deploy new technologies, and manage vendors, for operators, service providers and regulators. Digis Squared. Independent telecoms expertise.

Digital Catapult supports and promotes digital innovation and transformation to drive growth in the UK economy.

at800 was set up under Government direction to ensure that viewers who rely on Freeview for TV can continue to receive it, or are offered a suitable alternative, when 4G mobile services at 800 MHz are activated in their area. Satellite and cable services will not be affected.

Digital Steam engine is a new startup that is expanding the role of open source and a new credit based learning framework, including franchises.