| MSS Investments Limited | Other services | 2013 |
| MSS Myrtle Investment Limited | Real estate | 2024 |
| MSW Engineering Solutions Limited | Manufacturing | 2014 |
| Mtstrading Ltd | Wholesale & retail | 2023 |
| Muddled Puzzles Ltd | Information & communication | 2019 |
| Mugai Limited | Wholesale & retail | 2025 |
| Muhammad Management UK Ltd | Real estate | 2026 |
| Muka Limited | Construction | 2015 |
| Mukhlis Solutions Ltd | Information & communication | 2025 |
| Mumstars Ltd | Health & social care | 2022 |
| Munchzillaa Limited | Hospitality | 2024 |
| Munish's Techfin Limited | Information & communication | 2021 |
| Murahari Ltd | Construction | 2025 |
| Muralhas Limited | Real estate | 2025 |
| Muruka Ltd | Hospitality | 2025 |
| Muscle Car Dreams Ltd | Information & communication | 2021 |
| Mush Electrical & Building Limited | Construction | 2016 |
| Mustang Investment Group Ltd | Real estate | 2025 |
| Mustard Seed Properties Ltd | Real estate | 2021 |
| Musuj Ltd | Wholesale & retail | 2025 |
| Muzaana Care Services Ltd | Health & social care | 2017 |
| Mway Capital Ltd | Administrative & support | 2025 |
| MXA Property Management Ltd | Real estate | 2019 |
| My Art Logistics Limited | Transport & logistics | 2025 |
| My Kitchen Limited | Hospitality | 2022 |
| My New Boiler Limited | Construction | 2021 |
| My Webinars Limited | Information & communication | 2016 |
| My Webworld Ltd | Information & communication | 2019 |
| My-Tech Ltd | Information & communication | 2017 |
| Myacademix Ltd | Education | 2023 |
| Mymoon Consulting Ltd | Information & communication | 2016 |
| MYR Logistics Ltd | Transport & logistics | 2022 |
| Myron Capital Limited | Hospitality | 2025 |
| Myrtle & Myrrh Ltd | Manufacturing | 2025 |
| Mystic Events Ltd | Arts & recreation | 2018 |
| Mzntrip Ltd | Administrative & support | 2024 |
| N G N Property Investments Ltd | Real estate | 2017 |
| N Lopes Wellness & Massage Ltd | Other services | 2026 |
| N.P (Sarb) Ltd | Transport & logistics | 2025 |
| Naban Ltd | Other services | 2015 |
| Nacd Group Ltd | Wholesale & retail | 2017 |
| Nacora Insurance Brokers Limited | Financial services | 1983 |
| Nadytree Ltd | Wholesale & retail | 2025 |
| Nafnafglobal Limited | Administrative & support | 2023 |
| Naidu's Kitchen Limited | Wholesale & retail | 2021 |
| Najia Ltd | Wholesale & retail | 2025 |
| Naksha Ltd. | Information & communication | 2013 |
| Nakyazze Ltd | Manufacturing | 2024 |
| Nallhead Stables Limited | Agriculture & fishing | 2016 |
| Narichov Ltd | Real estate | 2026 |
| Narragansett Bay Company Limited | Extraterritorial | 2022 |
| NAS Gold Ltd | Hospitality | 2016 |
| Nasgoc Ltd | Health & social care | 2015 |
| Nasiri Legal Limited | Professional & scientific | 2024 |
| Natasha Bhatia Limited | Professional & scientific | 2015 |
| Nationwide Van Rental Ltd | Administrative & support | 2023 |
| Natural Food Hub Ltd | Wholesale & retail | 2024 |
| Natural Wood Play Grounds Limited | Construction | 2011 |
| Naveda Tech Ltd | Information & communication | 2025 |
| Navi Solutions London Ltd | Wholesale & retail | 2025 |
| Navmeet Properties Ltd | Real estate | 2025 |
| Naya Pana Ltd | Arts & recreation | 2025 |
| Naya Tech Services Limited | Information & communication | 2022 |
| NAZ Consultants Management Limited | Professional & scientific | 2014 |
| NAZ Pharmaceuticals Limited | Health & social care | 2025 |
| Nazzz Ltd | Wholesale & retail | 2023 |
| NB GOU Limited | Wholesale & retail | 2018 |
| NBK Heating & Plumbing Ltd | Construction | 2021 |
| NCM Distributors (North) Ltd | Administrative & support | 2020 |
| NCM Distributors Limited | Administrative & support | 2011 |
| NDI Group Ltd | Real estate | 2021 |
| NDP Smart Build Ltd | Construction | 2026 |
| NDS Finance Limited | Information & communication | 2008 |
| NDS Group Limited | Information & communication | 1985 |
| Near Surrey Construction Ltd | Construction | 2026 |
| Nearras Bakes Limited | Wholesale & retail | 2023 |
| Nearshore Ltd | Information & communication | 2016 |
| Nefertiti Aesthetics Ltd | Health & social care | 2023 |
| Nefertiti Shop Ltd | Information & communication | 2022 |
| Nepali Builder Ltd | Real estate | 2021 |
| Nepali Cultural Centre UK Ltd | Other services | 2025 |
| Nephthys Ltd | Other services | 2020 |
| Nest&Play Trading Ltd | Wholesale & retail | 2026 |
| NET 2 NET UK Ltd | Wholesale & retail | 2014 |
| NET Dragons Limited | Information & communication | 2014 |
| NET Essence Limited | Information & communication | 2009 |
| Nett Services Ltd | Transport & logistics | 2025 |
| Network Access Ltd | Construction | 2020 |
| Network Maintenance Limited | Information & communication | 1993 |
| Neuva Group Limited | Real estate | 2020 |
| New Clive Ltd | Real estate | 2025 |
| New Favourite Food Ltd | Wholesale & retail | 2023 |
| New FIX Limited | Construction | 2022 |
| New Galloway 1E Ltd | Professional & scientific | 2019 |
| New Golden Carpets & Furniture Limited | Wholesale & retail | 2007 |
| New Horizon Cleaning Limited | Administrative & support | 2003 |
| New Horizon Health and Social Care Ltd | Public administration | 2025 |
| New Jack Haulier Ltd | Transport & logistics | 2018 |
| New Spring Developments Ltd | Real estate | 2019 |
| New Start Estate Agents Ltd | Real estate | 2023 |