| Data City Innovations Ltd | |
| Data Clinic Ltd | Cheshire |
| Data Cubed Ltd | |
| Data Designs | Herefordshire |
| Data Developments | West Midlands |
| Data Direct Thames Valley Ltd | Berkshire |
| Data Dwell | |
| Data Encryption Systems | Somerset |
| Data Encryption Systems Ltd | Somerset |
| Data Fetcher | |
| Data Harvest | |
| Data HQ Ltd | |
| Data Installation & Suppliers Ltd | West Yorkshire |
| Data Interchange plc | Cambridgeshire |
| Data Interconnect | |
| Data Language | |
| Data Laser Mail | |
| Data Management Associates | Carmarthenshire |
| Data One Ltd | Leicestershire |
| Data Oversight Ltd | |
| Data Pro IT Ltd | |
| Data Product Services Ltd | Hampshire |
| Data Recovery Direct Ltd | Greater London |
| Data Recovery Hospital | South Yorkshire |
| Data Recovery London | Greater London |
| Data Recovery Services Ltd | |
| Data Revolution | |
| Data Science Festival | |
| Data Select Ltd | Buckinghamshire |
| Data Send UK Ltd | Greater London |
| Data Shepherd Ltd | |
| Data Spartan | |
| Data Standards Ltd | |
| Data Store 365 Ltd | |
| Data Strategy Consulting Ltd | |
| Data Valley Sales Ltd | |
| Data Web Security Ltd | |
| Data-Ware.co.uk | Warwickshire |
| Data8 Ltd | Cheshire |
| Databarracks Ltd | |
| Database For Business | Northamptonshire |
| Databowl | |
| DataCapture Ltd | |
| Datacenta Hosting | Dorset |
| Datacentre Services 4 U | |
| Datacentreplus UK | |
| Datactics | |
| DataDevil Ltd | Cumbria |
| Datadial Ltd | |
| DataEQ | |