| MTA Driving School Ltd | Education | 2026 |
| MTL Supps UK Limited | Administrative & support | 2024 |
| MTO Holdings Ltd | Other services | 2024 |
| Mucklow Charitable Trust Limited | Health & social care | 1978 |
| Mucklow Trading Limited | Wholesale & retail | 2026 |
| Muddy Paws Dog Boarding Ltd | Agriculture & fishing | 2022 |
| Muflahi TM Ltd | Construction | 2023 |
| Muminun Ltd | Wholesale & retail | 2025 |
| Munie Tech Services Limited | Manufacturing | 2013 |
| Munir Bros Halal Poultry Ltd | Wholesale & retail | 2015 |
| Munir Investments Ltd | Real estate | 2024 |
| Munster Construction Services Limited | Construction | 2021 |
| Murrell Design Limited | Professional & scientific | 2019 |
| Murtath Muhsin Ltd | Construction | 2025 |
| MUS Services Ltd | Information & communication | 2020 |
| Music Education Solutions Limited | Education | 2008 |
| Musta Media Ltd | Information & communication | 2013 |
| MV Global Interiors Ltd | Manufacturing | 2012 |
| Mvmnt Properties Ltd | Real estate | 2025 |
| MW Ltd | Information & communication | 2008 |
| MWF Facilities Management Ltd | Administrative & support | 2024 |
| MWM Group Holdings Limited | Financial services | 2024 |
| MWM Technologies Ltd | Wholesale & retail | 2021 |
| My Drinks Shop Ltd | Wholesale & retail | 2017 |
| My Marquee Ltd | Administrative & support | 2024 |
| My Policy Limited | Financial services | 1995 |
| My Safe Spray (Holdings) Limited | Manufacturing | 2013 |
| Mycobloom Ltd | Education | 2024 |
| Myvirtualmedic Limited | Wholesale & retail | 2016 |
| N & C Enterprises Limited | Hospitality | 2011 |
| N a Investment Group Limited | Real estate | 2025 |
| N Clark Flooring Ltd | Construction | 2026 |
| N H Homes Limited | Real estate | 2020 |
| N J Treadwell Ltd | Real estate | 2019 |
| N&N a Ltd | Transport & logistics | 2024 |
| N&N Interiors Ltd | Construction | 2023 |
| N.D.B. Commercials Limited | Manufacturing | 2012 |
| Najreno Ltd | Real estate | 2024 |
| Nakashy Limited | Professional & scientific | 2025 |
| Nankee Jeweller Ltd | Wholesale & retail | 2025 |
| Nannidoal Ltd | Wholesale & retail | 2026 |
| Narborough Plantations Limited | Agriculture & fishing | 1910 |
| Narked at 90 Ltd | Manufacturing | 2007 |
| Narrowboat Surveys Limited | Other services | 2002 |
| Nassers Health Ltd | Health & social care | 2025 |
| National Ductwork Suppliers Ltd | Wholesale & retail | 2020 |
| Nationwide F&S Trustees Limited | Extraterritorial | 2019 |
| Nationwide Fire & Security (UK) Ltd | Administrative & support | 2007 |
| Nationwide Sprinkler Systems Ltd | Extraterritorial | 2018 |
| Natural Bazaar Ltd | Wholesale & retail | 2022 |
| Natural Learning and Growth Partnership LLP | | 2016 |
| Natural Progression Horticultural Ltd | Wholesale & retail | 2021 |
| Natures Caring Hands Limited | Health & social care | 2014 |
| Naucka Ltd | Wholesale & retail | 2025 |
| NBB Healthcare Limited | Wholesale & retail | 2022 |
| NC Gunning Machine Tools Ltd | Wholesale & retail | 2020 |
| NCT Commercials Limited | Wholesale & retail | 2022 |
| NDR Property Limited | Real estate | 2025 |
| Ne-Zi-Fe Limited | Extraterritorial | 2017 |
| Nebula Audio Limited | Administrative & support | 2002 |
| Needham's Grange Residents Management Company Limited | Households | 2019 |
| NEGINFOOD1996 Ltd | Hospitality | 2019 |
| Neon Green Investments Ltd | Real estate | 2025 |
| Neon Green Limited | Information & communication | 2022 |
| Neon Reborn Ltd | Wholesale & retail | 2025 |
| Nestcore Ltd | Real estate | 2025 |
| Netherton Motor Company Limited | Wholesale & retail | 2019 |
| Netherton Phones Solutions Ltd | Wholesale & retail | 2023 |
| NEU Horizons Ltd | Health & social care | 2025 |
| Neurovascular Solutions Limited | Health & social care | 2013 |
| Neville Registrars Limited | Financial services | 2003 |
| New ERA Films Ltd | Manufacturing | 2019 |
| New Spring Trust | Administrative & support | 2012 |
| New Start 2012 Ltd | Extraterritorial | 2012 |
| New Start Maintenance Ltd | Construction | 2014 |
| New Turkish Style Ltd | Other services | 2025 |
| New View Surfaces Limited | Manufacturing | 2017 |
| Newbrel Holdings Limited | Manufacturing | 2009 |
| Newbrel Limited | Manufacturing | 1992 |
| Newco Management & Development Ltd | Construction | 2012 |
| Newfield Electrical Limited | Construction | 2003 |
| Newfield Fire Limited | Extraterritorial | 2013 |
| Newline Computing Systems Limited | Information & communication | 1988 |
| Nexuz Limited | Wholesale & retail | 2018 |
| NFE 2020 Ltd | Financial services | 2020 |
| NGK Lighthouse Kitchen Ltd | Hospitality | 2023 |
| NGO Services Ltd | Administrative & support | 2019 |
| NH Fire & Security Ltd | Construction | 2024 |
| Nibroo Consulting Limited | Professional & scientific | 2017 |
| Nicklin Audit Limited | Extraterritorial | 2014 |
| Nicstable Limited | Households | 2017 |
| Nightingale Derbyshire Five Limited | Hospitality | 2024 |
| Nightingale Derbyshire Four Ltd. | Real estate | 2019 |
| Nightingale Derbyshire Limited | Real estate | 2018 |
| Nightingale Derbyshire One Ltd. | Real estate | 2019 |
| Nightingale Derbyshire Three Ltd. | Real estate | 2019 |
| Nightingale Derbyshire Two Ltd. | Real estate | 2019 |
| Nightingale FOX Developments Limited | Real estate | 2021 |
| Nightingale Quarter Management Company Limited | Real estate | 2020 |
| Nimmings Construction Ltd | Construction | 2019 |