| Modalysis Ltd | Information & communication | 2015 |
| Modello (FG) Ltd | Wholesale & retail | 2022 |
| Modernmail Limited | Transport & logistics | 2023 |
| Modi and Esther Ltd | Real estate | 2013 |
| Modular Law Limited | Professional & scientific | 2017 |
| Modus Ponens Advisory Ltd | Administrative & support | 2026 |
| Moene Ltd | Financial services | 2017 |
| Mofat Limited | Transport & logistics | 2024 |
| Mogul Records Limited | Professional & scientific | 1988 |
| MOH Driving School Ltd | Education | 2025 |
| Mohkami Global Trade Ltd | Wholesale & retail | 2025 |
| Mojofuel Limited | Information & communication | 2000 |
| Mojok Care Limited | Administrative & support | 2026 |
| Mojok Foods Ltd | Hospitality | 2019 |
| Moksha Support Services Ltd | Health & social care | 2025 |
| Molls Munch Limited | Hospitality | 2025 |
| Moluxx Ltd | Other services | 2025 |
| Moments in Thyme Bar Services Ltd | Hospitality | 2026 |
| Moments in Thyme Hospitality Ltd | Hospitality | 2024 |
| Mona Estates Limited | Real estate | 2018 |
| Monap Limited | Wholesale & retail | 2018 |
| Monarch Digital Ltd | Information & communication | 2023 |
| Monat Bros Whisky Brokers Ltd | Wholesale & retail | 2022 |
| Mones ISA Ltd | Wholesale & retail | 2025 |
| Moneychat Limited | Financial services | 2025 |
| Moneychat Wallet Limited | Information & communication | 2021 |
| Moneyplus Hive Limited | Financial services | 2026 |
| Monika's Time Creators Limited | Other services | 2017 |
| Monitor Marketing Limited | Professional & scientific | 1993 |
| Monitra Ltd | Professional & scientific | 2006 |
| Monks Court Limited | Households | 2024 |
| Monpesh Ltd | Hospitality | 2025 |
| Monsey Estates Limited | Real estate | 2014 |
| Montague Medical Limited | Health & social care | 2012 |
| Montague Road Management Ltd | Real estate | 2026 |
| Moobish Ltd | Wholesale & retail | 2024 |
| Moonbright Star Properties Limited | Real estate | 2022 |
| Mooncat and Stone Tech Ltd | Wholesale & retail | 2025 |
| Moonstone Service Providers Ltd | Wholesale & retail | 2021 |
| Moore Music Ltd | Arts & recreation | 2026 |
| Moores and Sons Ltd | Real estate | 2023 |
| Moormate Limited | Information & communication | 2025 |
| Moorten Ltd | Real estate | 2002 |
| Moortide Ltd | Real estate | 1999 |
| Moqbel Ltd | Wholesale & retail | 2021 |
| Morada Limited | Professional & scientific | 2023 |
| Morcor Limited | Transport & logistics | 2013 |
| Mordi Ltd | Construction | 2025 |
| Mordy Ltd | Real estate | 2023 |
| More to This Life CIC | Professional & scientific | 2026 |
| Morester Ltd | Real estate | 2021 |
| Morinvest Holdings Limited | Financial services | 2024 |
| Morley Mills Ltd | Real estate | 2016 |
| Mornix Motion Pictures Limited | Information & communication | 2019 |
| Morson Global Services Limited | Administrative & support | 2012 |
| Morson Group Limited | Administrative & support | 2004 |
| Morson Holdings Limited | Administrative & support | 1999 |
| Morson Human Resources Limited | Administrative & support | 1992 |
| Morson International Holdings Limited | Financial services | 2025 |
| Morson Projects Limited | Manufacturing | 1979 |
| Mort Construction Co Ltd | Construction | 2008 |
| Mortar & Legacy Limited | Real estate | 2023 |
| Mortgage Point Limited(The) | Financial services | 1985 |
| Mosley Estates Ltd | Real estate | 2019 |
| Mossbrook Ltd | Real estate | 2024 |
| Mossland Developments Ltd | Real estate | 2021 |
| Mossley Road Estates Ltd | Real estate | 2024 |
| Mostalgia Ltd | Wholesale & retail | 2025 |
| Moston Express Ltd | Wholesale & retail | 2022 |
| Motek Racing Limited | Extraterritorial | 2025 |
| Moti's Furniture Ltd | Wholesale & retail | 2020 |
| Moti's Kitchen Limited | Hospitality | 2026 |
| Moti's Sandwiches Limited | Hospitality | 2026 |
| Motion Physio Ltd | Health & social care | 2024 |
| Motomo Ltd | Financial services | 2025 |
| Motor Accident Protection Services Limited | Professional & scientific | 1995 |
| Motor One Rental Ltd | Administrative & support | 2020 |
| Motor Workz Ltd | Wholesale & retail | 2022 |
| Motormova Ltd | Transport & logistics | 2026 |
| Motorpoint Manchester Ltd | Wholesale & retail | 2018 |
| Motorscreen Limited | Wholesale & retail | 2000 |
| Mottan Limited | Real estate | 2016 |
| Mount Chapel | Extraterritorial | 2013 |
| Mountain Sports Therapy Limited | Extraterritorial | 2024 |
| Mountside Freehold Ltd. | Real estate | 2026 |
| Mountwaver Ltd | Information & communication | 2025 |
| Mountwood Properties Ltd | Real estate | 1998 |
| Move the Needle Limited | Extraterritorial | 2022 |
| Movecheck Ltd | Real estate | 2025 |
| Moveinn Limited | Administrative & support | 2017 |
| Moving Forward (UK) Ltd | Other services | 2014 |
| Mowlow Holdings Ltd | Other services | 2023 |
| Mozkicks Ltd | Wholesale & retail | 2025 |
| MP FBA Solutions Limited | Wholesale & retail | 2023 |
| Mpet Services Ltd | Education | 2017 |
| MPH Strategy Consulting Limited | Professional & scientific | 2025 |
| MPM Designs Ltd | Manufacturing | 2021 |
| MPS Maintenance Limited | Construction | 2010 |
| MPT Employment Ltd. | Professional & scientific | 2017 |
| MR & JG Estates Ltd | Real estate | 2016 |