| Name | Region |
|---|---|
| Zudu Ltd | Dundee |
| Zumo Financial Services Ltd | |
| Zumzum | Greater Manchester |
| Zupa | Hampshire |
| Zuru Media | Hampshire |
| Zut Games Ltd | |
| Zut Media | Merseyside |
| Zuti | Essex |
| Zycomm Electronics Ltd | Derbyshire |
| Zygo Consulting | Nottinghamshire |
| Zygology Systems Ltd | Buckinghamshire |
| Zylentrix Ltd | |
| Zynk Software Ltd | |
| Zynstra Ltd | Somerset |
| Zypha Technologies Ltd | |
| Zytec Systems (UK) Ltd | Leicestershire |
| Zytronic UK | Tyne and Wear |
| Zyxel Networks UK Ltd | Berkshire |
| ZZ Creative Ltd | Leicestershire |
| Zzish | Greater London |
| Zzoomm plc |