| Modulo Ltd | |
| Modulous | Greater London |
| Modulr Finance Ltd | |
| Modus (Scotland) Ltd | Clackmannanshire |
| Mogrify Ltd | |
| Mohara | |
| MOJO CX | |
| Mojo Websites | |
| Moken Digital Ltd | |
| MoleSoft | Surrey |
| Moley Robotics | |
| Molfar Ltd | |
| Molo Agency | |
| Molten | Greater London |
| Molyon | |
| Momentum Bioscience Ltd | |
| Momentum Design | |
| Monaghan Consultants Ltd | Hertfordshire |
| Monarch Software Systems Ltd | |
| Monasis | South Yorkshire |
| Monek Ltd | Staffordshire |
| Monese | |
| Monese Ltd | |
| Monetise Media Ltd | Derbyshire |
| Monetizer | |
| Money Dashboard | Edinburgh |
| Moneybox | Greater London |
| Moneyfarm | Greater London |
| Moneyhub Financial Technology Ltd | |
| Moneyinfo Ltd | Warwickshire |
| MoneyMovr Ltd | |
| Moneynetint Ltd | |
| Moneypex | |
| Moneysoft Ltd | Hampshire |
| Moniepoint, Inc. | |
| Monitor Marketing Ltd | Greater Manchester |
| Monitra Ltd | |
| Monkey Puzzle Marketing | Surrey |
| MonkeyJob Systems | Suffolk |
| Monkish Web Design | |
| Monks | |
| Monochrome Ltd | Surrey |
| Monolith AI | |
| Montandon Ltd | |
| Monument Digital | |
| Monumental | |
| Monwell Ltd | |
| Moocowmedia Ltd | |
| MooD Enterprises Ltd | North Yorkshire |
| Moodeys Digital Marketing Agency | Bedfordshire |