| Murrough Limited | Real estate | 2002 |
| Musa Skegness Limited | Hospitality | 2024 |
| MV Happy Homes Limited | Real estate | 2020 |
| My Little Garden Ltd | Wholesale & retail | 2024 |
| My Mosaic Ltd | Information & communication | 2021 |
| Myrelsi Ltd | Professional & scientific | 2019 |
| Myriad Developments Ltd | Professional & scientific | 2011 |
| N.E Window Cleaning Ltd | Administrative & support | 2025 |
| N3 Series Properties Ltd | Real estate | 2025 |
| N3 Series Property Ltd | Real estate | 2025 |
| Nadine Key Ltd | Financial services | 2019 |
| Nansledan Interiors Ltd | Wholesale & retail | 2019 |
| Nathan & Belle Limited | Information & communication | 2025 |
| National Association of Drainage Contractors | Other services | 2017 |
| National Drainage Academy Ltd | Education | 2020 |
| National Drainage Helpline Limited | Public administration | 2016 |
| Nationwide Pathology Limited | Health & social care | 2010 |
| Natural Grower Limited | Manufacturing | 2018 |
| Natural Structures Limited | Construction | 2010 |
| Nature's Store Limited | Extraterritorial | 2010 |
| Navarro Property Management Ltd | Real estate | 2025 |
| Navtech Broadcast Services Limited | Professional & scientific | 2023 |
| Nayls Physiotherapy Ltd | Health & social care | 2025 |
| Nayo Boutique Limited | Wholesale & retail | 2022 |
| NC Bookkeeping Services Limited | Professional & scientific | 2009 |
| Nchf Limited | Financial services | 2023 |
| Nearhand Ltd | Wholesale & retail | 2026 |
| Neema Consulting Ltd | Professional & scientific | 2009 |
| NEH Consulting Limited | Administrative & support | 2016 |
| Neil Williams IT Consultancy Limited | Information & communication | 2011 |
| Nellsons International Limited | Information & communication | 2025 |
| Nelson Street (Management) Company Limited | Real estate | 1999 |
| Neosapient Ltd | Professional & scientific | 2018 |
| Nerissa EVE Weddings Limited | Other services | 2013 |
| Nestra Lending Limited | Financial services | 1994 |
| NET Hub Utilities Limited | Construction | 2017 |
| NET Magik Limited | Information & communication | 2015 |
| NET Performance Ltd | Professional & scientific | 2017 |
| Netlio Ltd | Information & communication | 2026 |
| Netted App Limited | Information & communication | 2026 |
| Neun CIC | Professional & scientific | 2025 |
| Neurothrive Group Ltd | Education | 2026 |
| Nevill Holt Community Arts Limited | Arts & recreation | 2015 |
| Nevill View Consultants Limited | Professional & scientific | 2018 |
| New Frontier Publishing Ltd | Information & communication | 2008 |
| New Horizons Care Holdings Limited | Financial services | 2023 |
| New Horizons Care Limited | Health & social care | 2006 |
| New Revival Cloud Limited | Information & communication | 2023 |
| New Revival Limited | Professional & scientific | 2002 |
| Newley Properties Ltd | Real estate | 2020 |
| Newley Property Maintenance Ltd | Construction | 2022 |
| Newman Cozens Holdings Limited | Financial services | 2018 |
| Newman Cozens Limited | Financial services | 1999 |
| Nexora Controls Ltd | Professional & scientific | 2026 |
| Nexpo Limited | Wholesale & retail | 2014 |
| Nextpath Consulting Ltd | Professional & scientific | 2024 |
| Nexus 8 Consulting Ltd | Administrative & support | 2026 |
| Nexus Private Office Limited | Financial services | 2025 |
| Nexus Wealth & Investment Limited | Financial services | 2025 |
| NG Skin Clinic Limited | Other services | 2013 |
| Ngbg Property Ltd | Real estate | 2023 |
| Nicbar Ltd | Information & communication | 2017 |
| Nice (Design) Ltd | Professional & scientific | 2020 |
| Nick Redfern Music Limited | Education | 2017 |
| Nick Worrall Consulting Ltd | Professional & scientific | 2022 |
| Nico's Protein Pizza Ltd | Manufacturing | 2023 |
| Nicole Monroe Ltd | Information & communication | 2026 |
| Nigel Green Consultants Limited | Administrative & support | 2003 |
| Nike Limited | Extraterritorial | 2013 |
| Nileplex Limited | Hospitality | 2017 |
| Nine Lives Ltd | Information & communication | 2024 |
| Nishmat Ltd | Professional & scientific | 2024 |
| Njpotter Ltd | Wholesale & retail | 2012 |
| NLD Investments Limited | Real estate | 2011 |
| NME Holdings Limited | Arts & recreation | 1991 |
| NN Journal CIC | Information & communication | 2020 |
| NO Change Limited | Administrative & support | 2008 |
| NO Confusion Limited | Professional & scientific | 2000 |
| NO.23 (Uppingham) Limited | Hospitality | 2022 |
| Nocturnal Holdings Ltd | Hospitality | 2018 |
| Nocturnal in Great Bowden Limited | Hospitality | 2018 |
| Nocturnal in Market Harborough Ltd. | Hospitality | 2018 |
| Nocturnal in the East Langton Limited | Hospitality | 2018 |
| Nocturnal Wine Bar Ltd | Hospitality | 2018 |
| Nomad Box Company Ltd | Professional & scientific | 2000 |
| Nomad Limited | Manufacturing | 1961 |
| Nomad Walling Ltd | Manufacturing | 2025 |
| Norbrook Holdings Limited | Professional & scientific | 1988 |
| Norbrook Laboratories (G.B.) Limited | Wholesale & retail | 1983 |
| North Oak Recruitment Limited | Administrative & support | 2010 |
| North Star Pharmaceuticals Limited | Wholesale & retail | 2020 |
| Northamptonshire Roofing Ltd | Construction | 2021 |
| Northants Computers Limited | Wholesale & retail | 1998 |
| Northants Thermal Ltd | Construction | 2021 |
| Northstar Career Compass Limited | Professional & scientific | 2025 |
| Northstar Racing Ltd | Professional & scientific | 2025 |
| Norton Adams Consulting Limited | Extraterritorial | 2012 |
| Norton Development Properties Limited | Construction | 2023 |
| Norton Property Consultants Limited | Construction | 1995 |
| Nova Sidera Events Ltd | Administrative & support | 2024 |