| Nine J Limited | Professional & scientific | 2009 |
| Nine Real Estate Ltd | Real estate | 2024 |
| Nineteen Services Ltd | Other services | 2026 |
| Ninety Five Digital Ltd | Professional & scientific | 2021 |
| Nirguna Solutions Limited | Information & communication | 2022 |
| Nishtha Business Services Limited | Information & communication | 2010 |
| Nixon's Rapid Mail & Freight Limited | Transport & logistics | 2014 |
| Nixuss Ltd | Information & communication | 2007 |
| NJK UK Solutions Limited | Information & communication | 2017 |
| NJS Construction Group Limited | Construction | 2025 |
| NK Gastrointestinal Care Limited | Health & social care | 2019 |
| NK Palazzo Ltd | Real estate | 2025 |
| NKM Global Events Ltd | Administrative & support | 2021 |
| NKM Properties Ltd | Real estate | 2017 |
| NKR TR@NS4RM Konsulting Ltd | Information & communication | 2018 |
| NL Data Solutions Limited | Information & communication | 2023 |
| NLB Property Ltd | Real estate | 2020 |
| Nlitedesign Ltd | Real estate | 2013 |
| NLT Marketing Limited | Professional & scientific | 2026 |
| NMM Property Limited | Real estate | 2023 |
| NMM Transport Services Ltd | Transport & logistics | 2024 |
| Nn&Lm Holdings Limited | Health & social care | 2026 |
| NO 10 Properties (Wendover) Limited | Financial services | 2020 |
| NO 32 Ltd | Real estate | 2013 |
| NO Perfect Parent Company CIC | Education | 2026 |
| Noble Landscapes Ltd | Administrative & support | 2018 |
| Noble Restaurant Limited | Hospitality | 2018 |
| Nobles Holding Limited | Real estate | 2025 |
| Nobo Group Limited | Professional & scientific | 1985 |
| Nobo Office Supplies Limited | Extraterritorial | 1985 |
| Nodus Events Limited | Information & communication | 2026 |
| Noise.Co.Uk Trustee Ltd | Professional & scientific | 2024 |
| Nokree Limited | Education | 2026 |
| Nola & Friends Limited | Other services | 2023 |
| Nonivlok Limited | Manufacturing | 2016 |
| Noonray Limited | Information & communication | 2020 |
| NOR Logistics Ltd | Transport & logistics | 2016 |
| Nord Adventure Anywhere Ltd | Wholesale & retail | 2025 |
| Nordic Generation Limited | Administrative & support | 2019 |
| Norfolk & Goode Properties Limited | Extraterritorial | 2019 |
| Norishor Ltd | Wholesale & retail | 2021 |
| Norma Care Limited | Health & social care | 2022 |
| Norman Court Trading Limited | Construction | 2019 |
| Normead Ltd | Hospitality | 2025 |
| Nortec Solutions Limited | Manufacturing | 1998 |
| North Base Camp Ltd | Manufacturing | 2024 |
| North IMS Limited | Administrative & support | 2010 |
| North Mill Stoves Limited | Construction | 2010 |
| North Property Holdings Limited | Real estate | 2017 |
| North Sea MED Ltd | Health & social care | 2013 |
| Northampton Orthodontics Limited | Health & social care | 2007 |
| Northorpe FEN Solar Farm Limited | Construction | 2025 |
| Northside Demolition Limited | Construction | 1991 |
| Notara PMS Ltd | Information & communication | 2026 |
| Note Haddenham Limited | Professional & scientific | 1999 |
| Nova Tech Solution Services Ltd | Information & communication | 2026 |
| Novadom Properties Ltd | Real estate | 2025 |
| Novulis Consulting UK Ltd | Information & communication | 2023 |
| Noyek Limited | Information & communication | 2019 |
| Noy’S Star Ltd. | Health & social care | 2019 |
| NPP Member Group (UK) Limited | Other services | 2023 |
| NR Business Solutions Limited | Administrative & support | 2025 |
| NRT Roofing & Building Ltd | Construction | 2026 |
| NRW Environmental Consultants Ltd | Professional & scientific | 2018 |
| NS Motorcycle Engineers Ltd | Wholesale & retail | 2021 |
| Nsdelta Limited | Information & communication | 2023 |
| NT Contract Consulting Services Private Ltd | Professional & scientific | 2025 |
| NTH Advisory Ltd | Professional & scientific | 2023 |
| Ntiques Limited | Wholesale & retail | 2018 |
| NTN Labs Ltd | Information & communication | 2025 |
| Ntpc Ltd | Professional & scientific | 2019 |
| NTS Optics Limited | Health & social care | 2020 |
| Nufreedom Ltd | Wholesale & retail | 2024 |
| NUH Estates Limited | Real estate | 2019 |
| Nulife Natural Pet Health Limited | Wholesale & retail | 2023 |
| Numbers Limited | Professional & scientific | 2006 |
| Numidian Ltd | Real estate | 2025 |
| NUR Choudhury Limited | Health & social care | 2012 |
| Nurses Alliance Care Solutions Limited | Administrative & support | 2023 |
| Nurses Alliance Limited | Health & social care | 2014 |
| Nurtival Homes Limited | Health & social care | 2025 |
| Nurture Inc Limited | Health & social care | 2023 |
| Nusight Opticians Ltd | Wholesale & retail | 2014 |
| NUT Tree Consulting Limited | Administrative & support | 2011 |
| Nutramedix Limited | Wholesale & retail | 2024 |
| Nutri-Ful Ltd | Health & social care | 2025 |
| Nutriance Limited | Wholesale & retail | 2019 |
| Nutriano Ltd | Health & social care | 2018 |
| Nutriworld Limited | Hospitality | 2020 |
| Nuyard Beechcroft Limited | Wholesale & retail | 2023 |
| Nuyard Group Limited | Wholesale & retail | 2017 |
| Nuyard Holdings Limited | Financial services | 2026 |
| NV Building Construction Ltd | Construction | 2023 |
| NXT GEN Scaffolding (Bucks) Ltd | Construction | 2026 |
| NY Best Deals Limited | Wholesale & retail | 2024 |
| Nyami Studio Limited | Construction | 2024 |
| Nyaradzo Services Ltd | Health & social care | 2018 |
| Nylon Colours France Limited | Administrative & support | 2008 |
| Nyxi Limited | Wholesale & retail | 2018 |
| O&L Electrical Ltd | Construction | 2015 |