| QubeGB Ltd | Scottish Borders |
| QubeTech | |
| Qubstudio | |
| Que Media | |
| Quechua Digital Advisory | |
| Queen Margaret University | |
| Queen Mary University of London | Greater London |
| Queen Mary University of London - School of Electronic Engineering and Computer Science | Greater London |
| Queen Mary University of London - School of Mathematical Sciences | Greater London |
| Queen's University Belfast | Belfast |
| Queen's University Belfast - School of Electronics, Electrical Engineering and Computer Science | Belfast |
| Quegal Ltd | |
| Quell Therapeutics Ltd | |
| QuellTX Ltd | |
| Quench.ai | |
| QueryClick Ltd | Edinburgh |
| QueryTree | |
| Quesst Digital Ltd | Lancashire |
| Quest Computing | South Yorkshire |
| Quest Search and Selection | |
| QuestDB | Greater London |
| Questers Global Group | |
| Quetzal Finance | |
| Quick and Simple Web Design | Staffordshire |
| Quick Circuits Ltd | Berkshire |
| Quick Innovations Ltd | Greater London |
| Quick Intelligence Ltd | |
| Quick Web Ltd | |
| QuickBlox | |
| QuickFile Ltd | |
| Quickfire Digital Ltd | |
| Quickline Communications Ltd | |
| Quicklizard Ltd | |
| QuickPrice | Belfast |
| Quicktext | |
| Quiet PC Ltd | North Yorkshire |
| Quik Internet | Buckinghamshire |
| Quine Technologies Ltd | |
| Quintadena Ltd | West Midlands |
| Quintech Computer Systems Ltd | Gloucestershire |
| Quinton Crane Electronics Ltd | Derbyshire |
| Quirkos | |
| Quiss Technology plc | Staffordshire |
| Quix | |
| Quix Analytics | |
| Quizbot.ai | |
| Qulix Systems | Cheshire |
| Qumata | |
| Quontex Ltd | |
| Quorso | |