| Nikki J Owen Limited | Professional & scientific | 2007 |
| Nikosfoodtrade Ltd | Wholesale & retail | 2022 |
| Nilash Letting Ltd | Real estate | 2018 |
| NIM Geospatial UK Ltd | Professional & scientific | 2022 |
| Nimal Service Ltd | Wholesale & retail | 2015 |
| Nimbasuk Ltd | Administrative & support | 2024 |
| Nina Burgess Ltd. | Wholesale & retail | 2010 |
| Ninelands Ltd | Real estate | 2015 |
| Nineveh Laboratories Ltd | Wholesale & retail | 2026 |
| NJ Sports Ltd | Wholesale & retail | 2026 |
| NKA Studio Ltd | Professional & scientific | 2021 |
| Nlct Limited | Information & communication | 2023 |
| Nmsic Ltd | Financial services | 2021 |
| Nnergi Consulting Ltd | Administrative & support | 2010 |
| Nnworthy Ltd | Professional & scientific | 2025 |
| NO Nonsense Solutions Ltd | Professional & scientific | 2014 |
| NO. 41 Bridge Road (Epsom) Managements Limited | Other services | 1975 |
| NO. Nine Bridge Road Wallington Company Limited | Households | 1982 |
| NO.150 Worple Road Management Company Limited | Households | 1984 |
| NO.5 Construction Ltd | Construction | 2024 |
| NO.7 Epsom Road (Leatherhead) Managements Limited | Households | 1973 |
| NO.8 Brunswick Road(Sutton)Management Company Limited | Households | 1972 |
| Noble Field Sports Limited | Arts & recreation | 2012 |
| Noble Maxwell Ltd | Information & communication | 2019 |
| Noisaa Elah Limited | Administrative & support | 2017 |
| Noise Group Limited | Manufacturing | 2022 |
| Noisemap Limited | Information & communication | 2008 |
| Noka Scaffolding Ltd | Construction | 2025 |
| Nomad Education Services UK Limited | Education | 2023 |
| Nomads Agency UK Ltd | Professional & scientific | 2018 |
| Non-Stop Music Limited | Administrative & support | 2010 |
| Nonsuch Electrical Solutions Ltd | Construction | 2004 |
| Norden Heating & Plumbing Supplies Ltd | Wholesale & retail | 2007 |
| Norfolk Uncovered Ltd | Agriculture & fishing | 2023 |
| Nork Residents Company Limited | Other services | 1988 |
| Norkbrook Ltd | Construction | 2025 |
| Norman Harris Limited | Administrative & support | 2025 |
| Norman Services Ltd | Information & communication | 2026 |
| Norstrom Threshing Limited | Professional & scientific | 2020 |
| Nortech Recruitment Ltd | Administrative & support | 2021 |
| North Business Consulting Group Ltd | Administrative & support | 2024 |
| North East Surrey College of Technology Trust | Education | 1990 |
| Northamptonshire Wood Recycling CIC | Water & waste | 2014 |
| Northdene Consulting Limited | Professional & scientific | 2022 |
| Northfield Development Consultants Limited | Real estate | 2005 |
| Northgate Capital Properties Ltd | Professional & scientific | 2026 |
| Northpoint Close (Management Company) Limited | Households | 2003 |
| Northpoint Close Limited | Households | 2018 |
| Northstreet Accountants Ltd | Information & communication | 2024 |
| Northwood Kingston Limited | Real estate | 2005 |
| Norwood Road Management (136-138) Limited | Households | 2000 |
| Noslen Legal Ltd | Professional & scientific | 2015 |
| NOT Just Computers Limited | Information & communication | 2002 |
| NOT the Bowling Club Ltd | Households | 2020 |
| Notable ACT Limited | Professional & scientific | 2017 |
| Notlost Limited | Other services | 2017 |
| Notman-Watt Consulting Limited | Professional & scientific | 2013 |
| Nova Cosmetics Care Ltd | Other services | 2026 |
| Novacore Limited | Information & communication | 2009 |
| Novaira Limited | Information & communication | 2010 |
| Novell Limited | Professional & scientific | 2016 |
| Novello Castles Surveyors Limited | Professional & scientific | 1991 |
| Novello Private Office Limited | Professional & scientific | 2024 |
| Novello Surveyors Ltd | Professional & scientific | 2019 |
| Noviabionrg Limited | Professional & scientific | 2025 |
| NOW Near Next Ltd. | Information & communication | 2010 |
| Nower Close (Epsom) Residents Management Company Limited | Households | 2018 |
| Noxa Ltd | Wholesale & retail | 2026 |
| NP Ultrasound Limited | Health & social care | 2026 |
| Nprd IT Ltd | Information & communication | 2021 |
| NPS Accountancy and Business Services Ltd | Professional & scientific | 2020 |
| Nrmj Limited | Information & communication | 2014 |
| NS Simple Properties Ltd | Real estate | 2020 |
| NS Simple Solutions Ltd | Information & communication | 2023 |
| NSD Technologies Limited | Administrative & support | 2016 |
| NSS Partners Limited | Information & communication | 2018 |
| NT 159 Ltd | Information & communication | 2024 |
| NTA Business Ltd | Health & social care | 2026 |
| Ntbt Transport Ltd | Transport & logistics | 2016 |
| NU Boyana UK Limited | Administrative & support | 2017 |
| Nu-Edge Property Management Limited | Real estate | 2020 |
| Nube DE Boina Limited | Wholesale & retail | 2024 |
| Nuffield Health | Health & social care | 1957 |
| Nuffield Health Care Limited | Health & social care | 1976 |
| Nuffield Health Day Nurseries Limited | Administrative & support | 1998 |
| Nuffield Health Pension Trustees Limited | Administrative & support | 2016 |
| Nuffield Health Wellbeing Limited | Arts & recreation | 1993 |
| Nuffield Nursing Homes Trust | Health & social care | 2003 |
| Nuffield Proactive Health Group Ltd | Administrative & support | 2005 |
| Nuffield Proactive Health Ltd | Health & social care | 1981 |
| Nuffield Proactive Health Medical Ltd | Health & social care | 2003 |
| Nuhemp Ltd | Wholesale & retail | 2019 |
| NULL0 Ltd | Information & communication | 2022 |
| Numquam Dede Limited | Professional & scientific | 2013 |
| Nuno Mendes Limited | Hospitality | 2014 |
| Nuprol Holdings Ltd | Professional & scientific | 2012 |
| Nuprol Ltd | Wholesale & retail | 2012 |
| Nurasla Ltd | Wholesale & retail | 2023 |
| Nuro Design & Build Limited | Construction | 2021 |
| Nuro Homes Limited | Construction | 2019 |