| Microspot Ltd | |
| Microsupply | Perth and Kinross |
| Microtech Electronics Ltd | Buckinghamshire |
| Microtech Support | East Ayrshire |
| Microtek Components Ltd | Berkshire |
| Microtek Services Ltd | West Yorkshire |
| Microweber CMS Ltd | |
| Mid Sussex Websites | |
| Mid-Blue | Kent |
| Midas Communications | Gloucestershire |
| Midas Design Consultants Ltd | |
| Midas Interactive Entertainment Ltd | Essex |
| Midas Solutions | Lancashire |
| Middlesex ITeC Ltd | Greater London |
| Middlesex University | Greater London |
| Middlesex University - Department of Computer Science | Greater London |
| Midgard | Swansea |
| Midland Communications Co. Ltd | Gloucestershire |
| Midland Computer Exchange | |
| Midland Computers | Shropshire |
| Midland Data Networks | Nottinghamshire |
| Midland Networks Group Holdings Ltd | |
| Midland Telecom Ltd | West Midlands |
| Midlands IT Support | West Midlands |
| Midlands Macintosh User Group | West Midlands |
| Mids Medical Ltd | |
| Midshire | West Midlands |
| Midsoft | |
| Midven | |
| Midwich | Norfolk |
| MIE Solutions UK Ltd | Worcestershire |
| Mighty Social | |
| Migrate Data Ltd | |
| Mike Lewis Consultants Ltd | Edinburgh |
| Mike Street | |
| Mike Weaver Communications Ltd | West Midlands |
| MiKopy Ltd | Hampshire |
| Mikrotek Solutions Ltd | Oxfordshire |
| Milamber Ventures plc | |
| Miles Industrial Electronics Ltd | Northamptonshire |
| Milk Bottle Designs | Bedfordshire |
| Milk Round Software | West Sussex |
| Milkshake Design UK Ltd | Cheshire |
| Milktub Ltd | |
| Milky Tea Ltd | |
| Mill House Internet Services | |
| MIllenium Consulting | Kent |
| Millennium Ltd | Rutland |
| Miller Solutions | Derbyshire |
| Millerchip Software Ltd | Hampshire |