| Solifi | Buckinghamshire |
| Sollatek | Berkshire |
| Solo60 | |
| Solomon Software | Hertfordshire |
| Solsoft | |
| Solution 7 Ltd | |
| Solution Consultants ICT Ltd | |
| Solution IP | Bristol |
| Solution Support Ltd | Staffordshire |
| Solution-I | |
| Solutionpath Ltd | |
| Solutions (Aberdeen) Ltd | Aberdeen |
| Solutions 2 Enterprise Ltd | Cheshire |
| Solutions 4 IT Ltd | |
| Solutions Digital Repairs | |
| Solutions for HR | |
| Solutions in I.T. Ltd | Leicestershire |
| Solutions NI | Mid-Ulster |
| Solutions Through Learning | |
| Solutions, Inc. | East Sussex |
| Solutions30 UK | |
| SolutionsPT Ltd | Greater Manchester |
| SOLV Ltd | Highland |
| Solvd Ltd | Hampshire |
| Solve | Cornwall |
| Solve-IT Southwest Ltd | Devon |
| Solvi & Heirs Ltd | |
| Solvo.ai Ltd | |
| Solweb | Dorset |
| Somerset Design | Bristol |
| Somerset Web Design Ltd | Somerset |
| Somerset Web Services Ltd | Somerset |
| Somerston Capital Ltd | |
| Somerville Development Partners Ltd | |
| SomewhatMedia | |
| Sona Technologies Ltd | |
| Sonar Systems | |
| Sonder Digital | |
| Sonet Digital | Kent |
| Sonictek Ltd | Tyne and Wear |
| Sonin | |
| Sonix Software Ltd | |
| Sonnedix | |
| Sonrai Analytics | |
| Sontec Electronics Ltd | Norfolk |
| Sony Europe B.V. | Surrey |
| SoPost Ltd | |
| Sorce Ltd | Berkshire |
| Sorex Sensors Ltd | |
| Sorrento Networks International, Inc. | Belfast |