| Myhoyland Community Group CIC | Information & communication | 2026 |
| Mystery MAN Limited | Information & communication | 2022 |
| Mzhp Limited | Health & social care | 2013 |
| N & B Property Solutions Ltd | Construction | 2019 |
| N & K Surveying Ltd | Professional & scientific | 2023 |
| N B (Press) Ltd | Professional & scientific | 2003 |
| N B Service Solutions Limited | Professional & scientific | 2020 |
| N C D International Limited | Manufacturing | 2002 |
| N H & Sons Properties Ltd | Other services | 2023 |
| N Jones & SON Ltd | Transport & logistics | 2017 |
| N M a (Agencies) Limited | Administrative & support | 2000 |
| N P & D J Darwin Ltd | Agriculture & fishing | 2003 |
| N Yoxall Groundworks Ltd | Construction | 2014 |
| N&D Building & Garden Supplies Ltd | Wholesale & retail | 2026 |
| N&N Family Properties Ltd | Real estate | 2015 |
| N&S Engineering Ltd | Wholesale & retail | 2018 |
| N-Hood Ltd | Professional & scientific | 2021 |
| N.I.B.S Construction Ltd | Construction | 2022 |
| N.I.B.S Developments Ltd | Real estate | 2021 |
| Nafa Entertainment Limited | Administrative & support | 2024 |
| Naga Properties Ltd | Real estate | 2018 |
| Nageena Limited | Wholesale & retail | 2010 |
| Nailed IT Roofing Limited | Construction | 2024 |
| Nailmaker Brewing Company Ltd | Manufacturing | 2017 |
| Nailmaker Distilling Company Ltd. | Manufacturing | 2017 |
| Nailmaker PUB Company Ltd | Hospitality | 2022 |
| Nairn Boxing & Fitness Centre Limited | Arts & recreation | 2025 |
| NAL Care Ltd | Administrative & support | 2023 |
| Nali Barber S74 Ltd | Other services | 2024 |
| Nalvey Contract Solutions Limited | Professional & scientific | 2024 |
| Nannahbakes Ltd | Hospitality | 2025 |
| Napper Property Limited | Real estate | 2024 |
| Nasolf Limited | Wholesale & retail | 2026 |
| Natalie Smith Photography Ltd | Professional & scientific | 2026 |
| National Building Products Limited | Wholesale & retail | 2023 |
| National Land Ltd | Extraterritorial | 2005 |
| National Market Traders Federation Ltd | Extraterritorial | 2015 |
| National Provincial House Ltd | Real estate | 2020 |
| National Roofing Supplies Limited | Construction | 2019 |
| Nationwide Electricity Limited | Energy | 2008 |
| Nationwide Power Ltd | Extraterritorial | 2012 |
| Nationwide Retail Limited | Wholesale & retail | 2007 |
| Native Tech Ltd | Information & communication | 2025 |
| Natural Cement Distribution Limited | Manufacturing | 1996 |
| Nature and Science Agriculture Limited | Wholesale & retail | 2009 |
| Navigate Financial Ltd | Financial services | 2024 |
| Navigate Transport Solutions Ltd | Professional & scientific | 2025 |
| Navon Consulting Ltd | Administrative & support | 2026 |
| Naylor & Ellis Electrical Ltd | Construction | 2025 |
| Naylor Commercial Properties Limited | Manufacturing | 1994 |
| Naylor Concrete Products Ltd | Manufacturing | 1943 |
| Naylor Drainage Holdco Limited | Financial services | 2024 |
| Naylor Drainage Ltd | Manufacturing | 1938 |
| Naylor Electrical Contractors Ltd | Construction | 2026 |
| Naylor Industries Limited | Financial services | 2023 |
| Naylor Property Holdings Limited | Financial services | 2023 |
| Naylor Specialist Plastics Limited | Manufacturing | 1938 |
| Naylor Technical Solutions Ltd. | Mining & quarrying | 2000 |
| Naylor Utilities Limited | Construction | 2017 |
| NB Gardening Services Limited | Administrative & support | 2013 |
| NB Jennings Plumbing & Heating Limited | Construction | 2009 |
| NBL OLE Construction Ltd | Administrative & support | 2016 |
| Nble Ltd | Construction | 2025 |
| NCK Property Services Limited | Construction | 2021 |
| NCO Marketing Ltd | Professional & scientific | 2021 |
| NCP Nanny Services Limited | Other services | 2025 |
| Nddservices Ltd | Transport & logistics | 2022 |
| NDG Marketing Services Ltd | Wholesale & retail | 2026 |
| NDJ Transport Ltd | Transport & logistics | 2025 |
| NDS Electrical & Security Limited | Construction | 2013 |
| NE Power Ltd | Construction | 2024 |
| Neal & Scott Property Ltd | Real estate | 2019 |
| Neal Smith Construction Limited | Construction | 2012 |
| Neapolitan Fire Ltd | Wholesale & retail | 2025 |
| Neca Investment Ltd | Real estate | 2025 |
| Needham Financial Ltd | Professional & scientific | 2024 |
| Needlewood Management Company Limited | Real estate | 2015 |
| Neeko Technology Services Ltd | Wholesale & retail | 2016 |
| Neil Judge Contracting Limited | Construction | 2024 |
| Neil LE Masurier Plastering Ltd | Construction | 2025 |
| Neil Wake Services Ltd | Construction | 2012 |
| Nelutu&Andreea Ltd | Financial services | 2020 |
| NEO Strategic Consulting Limited | Professional & scientific | 2015 |
| Neon Phoenix Ltd | Wholesale & retail | 2025 |
| Neoteric Structural Engineers Limited | Professional & scientific | 2024 |
| Nerd Engine Limited | Information & communication | 2026 |
| Nerdy Ltd | Professional & scientific | 2008 |
| Nero Angling Limited | Wholesale & retail | 2020 |
| Nesh Mobility Solutions Limited | Wholesale & retail | 2017 |
| Nestled Ltd | Professional & scientific | 2024 |
| Network Management Solutions Limited | Information & communication | 1998 |
| Neutrix Industries Ltd | Construction | 2026 |
| Neville Roofing Services Limited | Construction | 2021 |
| New Barnsley House Limited | Hospitality | 2025 |
| New Build Labour Ltd | Construction | 2019 |
| New Deniros Pizza Limited | Hospitality | 2025 |
| New Flow Therapies & Wellbeing Community Interest Company | Health & social care | 2026 |
| New Gaze Films Ltd | Information & communication | 2023 |
| New GEN Solutions Group Ltd | Construction | 2025 |
| New Hall Farm Limited | Agriculture & fishing | 1960 |