| MT Investment Holdings Ltd | Professional & scientific | 2022 |
| Mudd Creative Ltd | Arts & recreation | 2019 |
| Mugged. Coffee Ltd | Manufacturing | 2025 |
| Mughil Consultancy Services Limited | Information & communication | 2022 |
| Mulberry Homes (Churt) Ltd | Construction | 2019 |
| Mulberry Homes (Ropley) Ltd | Construction | 2014 |
| Mulberry Homes Group Ltd | Construction | 2021 |
| Muledi Consulting Services Ltd | Professional & scientific | 2023 |
| Muller Kocher Limited | Professional & scientific | 2012 |
| Multibyte Ltd | Information & communication | 2000 |
| Multimedia Theological Training Ltd | Education | 2011 |
| Munam Ltd. | Wholesale & retail | 2016 |
| Muqadas Kitchens Ltd | Hospitality | 2025 |
| Murmur Research and Consultancy Limited | Professional & scientific | 2017 |
| Music and Melody Limited | Information & communication | 2010 |
| Muugen Studios Ltd | Information & communication | 2020 |
| Mvbe Properties and Services Limited | Real estate | 2020 |
| MWOUK09 Ltd | Real estate | 2020 |
| Mwux Ltd | Professional & scientific | 2022 |
| My Best Choice Ltd | Wholesale & retail | 2026 |
| My Choice Fresh Ltd | Wholesale & retail | 2020 |
| My Door Fitters Ltd | Construction | 2026 |
| My Eden Limited | Wholesale & retail | 2013 |
| My First Car (Hampshire) Limited | Wholesale & retail | 2018 |
| Myami Excellent Logistics Ltd | Transport & logistics | 2024 |
| Mydatalife Limited | Information & communication | 2021 |
| Mylifeanchor Ltd | Information & communication | 2026 |
| Mystique Zone Ltd | Wholesale & retail | 2026 |
| Mytchett Ltd | Administrative & support | 2012 |
| N Drake Electrical Services Ltd | Construction | 2022 |
| N.H.G. High Voltage Consultancy Ltd | Construction | 2014 |
| NAB Associates Ltd | Professional & scientific | 2020 |
| Naijahousewife Ltd | Education | 2025 |
| Naimuri Limited | Information & communication | 2014 |
| Nainika Tech Solutions Ltd | Information & communication | 2018 |
| NAM Estate Agents Ltd | Real estate | 2021 |
| NAM Mortgages Ltd | Financial services | 2022 |
| Namco Automotive Limited | Wholesale & retail | 2003 |
| Namis Suites Ltd | Hospitality | 2026 |
| Namuna Hair & Beauty Training Centre Ltd | Other services | 2018 |
| Nanak Online Store Ltd | Wholesale & retail | 2026 |
| Napier Tika Ltd | Professional & scientific | 2025 |
| Narn Ltd | Information & communication | 2025 |
| Nash Healthcare PVT Ltd | Administrative & support | 2024 |
| NAT20 Ltd | Professional & scientific | 2020 |
| Nata Mobile Limited | Administrative & support | 2016 |
| Nationwide Mobility Limited | Wholesale & retail | 1997 |
| Natural Trade Brokers Limited | Professional & scientific | 2009 |
| Navari Talent Limited | Administrative & support | 2025 |
| Navoss Ltd | Wholesale & retail | 2025 |
| Navsmed Ltd | Manufacturing | 2026 |
| NB Design Studio Limited | Professional & scientific | 2014 |
| NC Dragon Limited | Hospitality | 2025 |
| NC Hires Limited | Administrative & support | 2018 |
| Nc-App Ltd | Information & communication | 2025 |
| NCU Digital Ltd | Information & communication | 2026 |
| ND Real Estate Aldershot Ltd | Real estate | 2024 |
| Ndoor Engineering Ltd | Professional & scientific | 2011 |
| NDP Energy Services Limited | Professional & scientific | 2015 |
| Ndreams Limited | Information & communication | 2002 |
| Near Light Limited | Information & communication | 2016 |
| Nedde Training Ltd | Professional & scientific | 2022 |
| Neighbourhood Care Limited | Health & social care | 2010 |
| Nender Residents Association Limited | Households | 1989 |
| Nendle Acoustics Company Limited | Extraterritorial | 1985 |
| Nendle Containerised Systems Limited | Professional & scientific | 1990 |
| Nendle Limited | Extraterritorial | 2004 |
| Neo-Sol Ltd | Administrative & support | 2010 |
| Neon AV Ltd | Professional & scientific | 2008 |
| Nepal Kitchens Limited | Hospitality | 2003 |
| Nepali Mann Udhyog Limited | Wholesale & retail | 2017 |
| Nepinex Ltd | Manufacturing | 2025 |
| Nestex Group Ltd | Financial services | 2024 |
| Nestwell Properties Ltd | Real estate | 2025 |
| New Dorp Ltd | Professional & scientific | 2015 |
| New Farnborough Sushi Ltd | Hospitality | 2022 |
| New Hybrid Trade Ltd | Wholesale & retail | 2019 |
| New Lite Property Services Ltd | Construction | 2018 |
| New Moon Comforts Ltd | Wholesale & retail | 2025 |
| New World Strategies Limited | Wholesale & retail | 2025 |
| Newlife IT Ltd | Water & waste | 2016 |
| Newman Cook Associates Limited | Professional & scientific | 2015 |
| Newsum Manufacturing Limited | Manufacturing | 2005 |
| Nexicog Ltd | Information & communication | 2025 |
| Nexo Recruitment Ltd | Administrative & support | 2018 |
| Next GEN Media Limited | Information & communication | 2025 |
| Nexteng Limited | Professional & scientific | 2020 |
| Nhat NAM Martial Arts (UK) Ltd | Education | 2017 |
| Nhuc Resources Limited | Health & social care | 2021 |
| Nicec Limited | Professional & scientific | 2007 |
| Nicholass Catering Limited | Hospitality | 2010 |
| Nick Lewis Ltd | Information & communication | 2010 |
| Nicola Agassi Ltd | Wholesale & retail | 2024 |
| Nicola Charlotte Ltd | Health & social care | 2024 |
| Night Sky Consulting Ltd | Professional & scientific | 2018 |
| Nightingale Residents Company Limited | Administrative & support | 1984 |
| Nika Construction Ltd | Construction | 2023 |
| Nimble IT Technologies Ltd | Information & communication | 2015 |
| Niyom Thai Massage Ltd | Health & social care | 2026 |
| Njc-Finance Limited | Professional & scientific | 2018 |