| Name | Region |
|---|---|
| designlaboratory* | |
| Designmc Ltd | |
| DesignMe | |
| DesignNG | |
| DesigNNish | |
| Designpix Ltd | North Yorkshire |
| DesignRemotely | |
| DesignStack Ltd | |
| DesignStudio Group Ltd | |
| Designwebskills | Glasgow |
| Desirable Image | South Yorkshire |
| Desk Top Publishing Microsystems Ltd | West Yorkshire |
| Deskpro Ltd | |
| Desktop IT Ltd | |
| Despark | |
| Despatch Cloud Ltd | North Yorkshire |
| Desquared Marketing Ltd | |
| DestiNet Ltd | |
| DestinyPharma Ltd | |
| Destroy All Monsters | Leicestershire |
| Desugn & I | |
| Desynz Ltd | Greater London |
| Detected | |
| Deuce Creative | |
| Dev-WP | |
| Deva Electronic Controls Ltd | Merseyside |
| DevAngels Ltd | |
| DevBench | |
| Devbox Technologies | |
| Develo | |
| Develop and Promote Ltd | |
| Develop Conference | |
| Developer Connection | |
| Developer Society Ltd | |
| Developer Solutions | Devon |
| DeveloperHub.io Ltd | |
| Developers Studio | |
| DeveloperTech News | |
| DevelopHer | |
| Developing Dreams Ltd | East Sussex |
| Developing Experts | |
| Developing Infrastructure | |
| Developing IT Ltd | |
| DevelopMyTeam | |
| Develte Ltd | |
| Devenia Ltd | |
| Dever Software Ltd | |
| DevGap | |
| DevGrid | |
| Device Authority Ltd | Berkshire |