| Cloud Smart Solutions Ltd | Buckinghamshire |
| Cloud Systems | |
| Cloud Technology Solutions Ltd | Greater Manchester |
| Cloud Wireless | |
| Cloud8 | East Sussex |
| Cloud8 Ltd | |
| Cloud9 Systems | Greater London |
| Cloudabove | |
| CloudApps Ltd | Berkshire |
| Cloudblue Web Design | Nottinghamshire |
| CloudBuy | |
| CloudCoCo Group plc | |
| CloudConnX Ltd | |
| CloudDirect | Berkshire |
| Cloudev Ltd | Greater London |
| Cloudfind Ltd | |
| Cloudgi | |
| CloudGuard AI | |
| Cloudhouse Technologies | |
| Cloudina Ltd | |
| Cloudit | |
| Cloudlearn Technologies Ltd | |
| CloudM | |
| CloudMailin | |
| CloudMargin Ltd | |
| CloudNC | |
| CloudNine Consultants Ltd | Somerset |
| Cloudoko Ltd | |
| Cloudologix | |
| CloudOrigin Ltd | |
| Cloudpay | |
| CloudPlease Ltd | |
| Cloudreach | |
| CloudScape Connect Ltd | Leicestershire |
| CloudSense Ltd | |
| Cloudserve | Dorset |
| Cloudsmith | Belfast |
| Cloudsoft Corporation Ltd | |
| Cloudsteps Ltd | |
| CloudTech24 | Surrey |
| Cloudtopia | |
| CloudyIT | Buckinghamshire |
| Cloudzant | |
| Clove Technology | Dorset |
| Club Studio Ltd | |
| Clubnet Digital Ltd | Devon |
| Clue Computing Co. Ltd | Bristol |
| Clues & Co | Essex |
| Clustermarket | |
| CLX | West Sussex |