| PWR Pack Ltd | |
| PXN Ventures | |
| PXOSYS, Inc. | Greater London |
| PXP Financial | Hertfordshire |
| Pycno IoT Sensors | |
| PyCon UK | Cardiff |
| Pyronix Ltd | South Yorkshire |
| Pytech | |
| Pythagoras Communications Ltd | Berkshire |
| Python Technology Ltd | Oxfordshire |
| PythonAnywhere, LLP | |
| Q Associates Ltd | Berkshire |
| Q Base Data Services Ltd | Cheshire |
| Q Electronics Ltd | West Yorkshire |
| Q Internet | |
| Q One Tech | |
| Q Software Global Ltd | Surrey |
| Q-ball media Ltd | Devon |
| Q-Bot Ltd | |
| Q-Systems Ltd | Essex |
| Q-Tec Solutions | |
| Qadre Ltd | Greater London |
| Qatalog Ltd | |
| QB Design | West Midlands |
| QBD | Worcestershire |
| Qbic Internet Solutions | Northamptonshire |
| QBS PC Help UK | Causeway Coast and Glens |
| QBS Software | Greater London |
| QCon London | |
| QED Naval Ltd | |
| QFS Ltd | Cheshire |
| QGate | Hampshire |
| Qi Marketing & Web Design | |
| Qi3 Ltd | |
| QIB (UK) plc | |
| QiC Systems Ltd | Hampshire |
| QikServe | |
| QinetiQ | Hampshire |
| Qkine Ltd | |
| QM Systems Ltd | Worcestershire |
| QMS Ltd | Surrey |
| QMTech Ltd | |
| Qodeo | |
| Qogita | |
| QoreIT | |
| Qorum | |
| QR Code Generator, Inc. | Isle of Man |
| QRO Solutions | |
| QS Quacquarelli Symonds Ltd | |
| Qtac Solutions Ltd | Bristol |