| Agora Digital Markets Ltd | |
| AGR Automation Ltd | |
| Agrismart | |
| Agrivi | Greater London |
| Agrolabs Ltd | |
| Agronomics | |
| Agroxy | |
| AGT Computer Services Ltd | |
| AGT Web | |
| Agumdoo Design | Stirling |
| AGW Electronics Ltd | Derbyshire |
| AGWebData | Suffolk |
| Agylia Group Ltd | Gloucestershire |
| AH Partnership Ltd | |
| AHB Information Technology Solutions | |
| Ahead4 Ltd | Essex |
| Ahoy Branding Ltd | Greater Manchester |
| AI Build Ltd | |
| AI Business | |
| AI Expo | |
| AI Factory | |
| AI Hardware & Edge AI Summit | |
| AI Hardware & Edge AI Summit Europe | |
| AI Magazine | |
| Ai Networks | Greater London |
| Ai Solutions Ltd | Bedfordshire |
| AI Studio | |
| AIApply Ltd | |
| AilseVax | |
| AIM Internet Ltd | West Midlands |
| Aimes Grid Services Ltd | Merseyside |
| Aindale Business and Technology Ltd | West Yorkshire |
| Air | West Midlands |
| Air Design Ltd | |
| Air IT | Derbyshire |
| Air IT | |
| Air Web Solutions | Greater London |
| Aira Digital Ltd | |
| Airangel Ltd | |
| AirBlade Software Ltd | |
| Airbyte Digital Ltd | |
| Aire Global Ltd | |
| Aire Logic Ltd | |
| Airedale Computers | |
| AireWeb | West Yorkshire |
| Airfinity Ltd | |
| AIRPA Research & Development | |
| Airparks Services Ltd | |
| Airport Information Systems Ltd | Nottinghamshire |
| AirPortr | |