| Mtbsoftware Limited | Information & communication | 2002 |
| Mudassir Services Ltd | Other services | 2012 |
| Muddy Bugs Limited | Education | 2010 |
| Mulgas 2 Ltd | Financial services | 2014 |
| Mulgas Limited | Professional & scientific | 2007 |
| Mulliner Investments Limited | Real estate | 1994 |
| Multicontrols Limited | Manufacturing | 2013 |
| Multiprop Electrical Limited | Administrative & support | 2025 |
| Multiprop Group Limited | Professional & scientific | 2021 |
| Multitracks Limited | Manufacturing | 2018 |
| Multitron Limited | Wholesale & retail | 2012 |
| Mumbai Local Street Food Ltd | Hospitality | 2026 |
| Munnsuk Ltd | Manufacturing | 2021 |
| Munro of Fowey Limited | Real estate | 2022 |
| Murshad G 804 Takeaway Ltd | Hospitality | 2024 |
| Murtaza Investments Ltd | Real estate | 2021 |
| Muse Beauticians Ltd | Other services | 2024 |
| Mushu & Company Limited | Education | 2021 |
| Musilearn Ltd | Education | 2026 |
| Muslims Unite Ltd | Other services | 2026 |
| Mustafa Homes & Development Limited | Real estate | 2014 |
| Mutule Ltd | Construction | 2020 |
| MVA Express Ltd | Transport & logistics | 2025 |
| MVG Trans Ltd | Transport & logistics | 2025 |
| Mvsquared Limited | Information & communication | 2005 |
| MW CFO Services Ltd | Professional & scientific | 2022 |
| MWC Consulting Limited | Administrative & support | 2022 |
| MWC Properties Limited | Real estate | 2023 |
| Mwccf Holdings Ltd | Financial services | 2022 |
| MXM Legal Services Limited | Professional & scientific | 2024 |
| My Business and Lifestyle Assistant Ltd | Administrative & support | 2018 |
| My Home Direct Limited | Real estate | 2015 |
| My Kids FUN Limited | Real estate | 2021 |
| My Link Ltd | Information & communication | 2024 |
| My Little EYE Productions Ltd | Information & communication | 2011 |
| My Planet Health C.I.C. | Education | 2025 |
| My Tech Coach Limited | Information & communication | 2025 |
| My Voyage Care Solutions Limited | Health & social care | 2022 |
| Mychainmap Ltd | Information & communication | 2025 |
| Mydan Alsham Ltd | Hospitality | 2022 |
| Mylor Financial Management Limited | Professional & scientific | 2012 |
| Mymakan Express Limited | Hospitality | 2025 |
| Myrtle and MAY Ltd | Hospitality | 2022 |
| Mysa Furniture Ltd | Wholesale & retail | 2024 |
| Mythirdplace Ltd | Information & communication | 2024 |
| Mytime Care Agency Ltd | Administrative & support | 2021 |
| Myzzi Limited | Wholesale & retail | 2022 |
| N & a [Guildford] Limited | Construction | 2002 |
| N D Williams Ltd | Construction | 2015 |
| N K T Travels Limited | Transport & logistics | 2017 |
| N K Webb Limited | Financial services | 2008 |
| N&J Marshall Ltd | Professional & scientific | 2018 |
| NA Builders & Construction Ltd | Construction | 2024 |
| NA Taxis Ltd | Transport & logistics | 2019 |
| Nadia Fitness Ltd | Other services | 2026 |
| Nagrom Ltd | Administrative & support | 2017 |
| Nails by EMZ Ltd | Other services | 2025 |
| Najih Limited | Wholesale & retail | 2020 |
| Nala Property Investments Ltd | Real estate | 2022 |
| Namam Limited | Professional & scientific | 2025 |
| Namaqua Capital Advisors Limited | Financial services | 2021 |
| Nameless Motorsport Ltd | Arts & recreation | 2024 |
| Nanofab International Ltd | Wholesale & retail | 2025 |
| Naoste Limited | Real estate | 2015 |
| NAP & SON Housing Limited | Real estate | 2022 |
| Narrabox Comics Publishing Limited | Information & communication | 2023 |
| Narratology Marketing Limited | Professional & scientific | 2016 |
| Nasa Finance Ltd | Financial services | 2020 |
| Nascadh Consulting Ltd | Information & communication | 2026 |
| Nashe UK Properties Ltd | Extraterritorial | 2019 |
| Nasjet Ltd | Information & communication | 2013 |
| Natalie Moss Photography Limited | Professional & scientific | 2022 |
| Nataly the Pastry LAB Limited | Manufacturing | 2025 |
| Natasu Ltd | Administrative & support | 2024 |
| Natcho Creative Ltd | Information & communication | 2023 |
| Natel Computing Limited | Professional & scientific | 1997 |
| Nath & RAJ Private Ltd | Wholesale & retail | 2026 |
| Nathan Hallam Design Ltd | Information & communication | 2018 |
| National Association of Security Dog Users | Other services | 1996 |
| National Clay Target Shooting Association Ltd | Extraterritorial | 2005 |
| National Shooting Centre Limited | Arts & recreation | 1998 |
| Natural Beauty Enhanced Ltd | Other services | 2025 |
| Natural Relax Ltd | Health & social care | 2013 |
| Natural World Consulting Ltd | Administrative & support | 2010 |
| Nature's Healing Limited | Health & social care | 2017 |
| Naturoyoga Ltd | Health & social care | 2018 |
| Nautical Cloud Ltd | Information & communication | 2023 |
| Navara Browbar Limited | Other services | 2012 |
| Navarino Electric Systems Limited | Manufacturing | 1998 |
| Navcom Avionics Assets Limited | Transport & logistics | 2012 |
| Navcom Avionics Ltd | Transport & logistics | 2012 |
| Navigator Natural Energy Ltd | Manufacturing | 2026 |
| Nayaa Properties Ltd | Real estate | 2025 |
| NCT Surveying Services Limited | Professional & scientific | 1998 |
| ND Supermarket Ltd | Wholesale & retail | 2021 |
| NDJ Productions Ltd | Arts & recreation | 2025 |
| NDM Professional Services Limited | Professional & scientific | 2026 |
| NE Roofing Solutions Ltd | Construction | 2015 |
| Neagu Company Ltd | Wholesale & retail | 2024 |
| Neale Family Estates Limited | Construction | 1999 |