| N & a Healy Enterprises Limited | Health & social care | 2021 |
| N & a Property Project Management Limited | Construction | 2018 |
| N V L Building Solutions Limited | Construction | 2014 |
| N.E. European Ltd | Professional & scientific | 2024 |
| N.P.S. Investments Limited | Real estate | 2014 |
| Naisbit Electrical Solutions and Trade Ltd | Manufacturing | 2022 |
| Naitive Ltd | Information & communication | 2024 |
| Naked Lunch Limited | Arts & recreation | 2011 |
| Namib Security Limited | Administrative & support | 2013 |
| Napior Ltd | Transport & logistics | 2014 |
| Nasuni UK Ltd | Information & communication | 2015 |
| National Battery Centre Limited | Professional & scientific | 2017 |
| National Digital Centre Limited | Professional & scientific | 2017 |
| National Fuel Solutions Ltd | Wholesale & retail | 2023 |
| Natural Destiny Limited | Wholesale & retail | 2016 |
| Natural Look INK Ltd | Other services | 2023 |
| Natural Vitality Screening Limited | Health & social care | 2023 |
| Nature Commodities Trading Ltd | Manufacturing | 2019 |
| NAV Online Limited | Information & communication | 2011 |
| Nazim Ahmed Consulting Ltd | Wholesale & retail | 2021 |
| NB Creative Ltd | Arts & recreation | 2023 |
| Ncgb Limited | Real estate | 2024 |
| NDL Project Development Limited | Professional & scientific | 2015 |
| Neave Research Ltd | Manufacturing | 2020 |
| Nebula Bidco Limited | Financial services | 2021 |
| Nebula Midco 1 Limited | Financial services | 2021 |
| Nebula Midco 2 Limited | Financial services | 2021 |
| Nebula Topco Limited | Financial services | 2021 |
| Need a Friend Ltd | Administrative & support | 2026 |
| Neika Property Holdings Ltd | Real estate | 2024 |
| Nelli Distribution Ltd | Wholesale & retail | 2025 |
| Nelu Buzdugan Ltd | Transport & logistics | 2026 |
| Neptune Property Management Ltd | Households | 2019 |
| Ness & Lilu Pet Care Services Ltd | Extraterritorial | 2025 |
| Nest Properties and Lettings Ltd | Real estate | 2025 |
| Nesta Marketing Ltd | Information & communication | 2017 |
| Nesta Property Ltd | Information & communication | 2017 |
| Net-Hero Limited | Professional & scientific | 2021 |
| Network Experts Internet Ltd | Information & communication | 2008 |
| Network Experts Limited | Information & communication | 2003 |
| Neura Mobile Robots Ltd | Manufacturing | 1980 |
| Nevo Developments Limited | Wholesale & retail | 2005 |
| New Aura Limited | Other services | 2006 |
| New Beginning Trading Ltd | Transport & logistics | 2023 |
| New Horizon Sailing Limited | Arts & recreation | 2016 |
| New Master Ltd | Other services | 2018 |
| New Nicholsons Limited | Financial services | 2022 |
| New Rise DHC Ltd | Hospitality | 2022 |
| New Takesi Limited | Financial services | 2022 |
| Newbury Orthodontics Limited | Health & social care | 2015 |
| Newfound Letting Ltd | Real estate | 2026 |
| Newman Ventures Limited | Wholesale & retail | 2012 |
| Newmarch Consulting Limited | Professional & scientific | 2019 |
| Newmills Farm Limited | Real estate | 2023 |
| Nexus Bay Ltd | Wholesale & retail | 2025 |
| Nexus Programme Consulting Ltd | Information & communication | 2025 |
| NG Equipment Limited | Administrative & support | 2021 |
| NGD Projects Ltd | Construction | 2022 |
| NGP Limited | Real estate | 2021 |
| NGU Capital Partners Ltd | Real estate | 2022 |
| Nicaura Ltd | Health & social care | 2025 |
| Nice Moon Limited | Information & communication | 2011 |
| Nichol Consulting Ltd | Construction | 2021 |
| Nicholson Nurseries Limited | Agriculture & fishing | 2003 |
| Nicholsons Trustee Limited | Extraterritorial | 2025 |
| Nick Alcraft Accounting Services Ltd | Construction | 2001 |
| Nick Barnes Wealth Management Limited | Financial services | 2010 |
| Nick Bolton Ltd | Manufacturing | 2020 |
| Nick Castle Osteo Limited | Health & social care | 2025 |
| Nick Jones Limited | Arts & recreation | 2003 |
| Nick White Solutions Limited | Information & communication | 2019 |
| Nine Group Limited | Arts & recreation | 2025 |
| Niralak Energy Ltd | Wholesale & retail | 2017 |
| Nirmala Group Ltd | Wholesale & retail | 2024 |
| Nitin Patel Consulting Limited | Professional & scientific | 2019 |
| NJ Construction Group Ltd | Construction | 2025 |
| NJS Investments Oxon Limited | Professional & scientific | 2019 |
| NJS Properties Oxon Limited | Real estate | 2019 |
| Nmp&Acp Consulting Ltd | Public administration | 2023 |
| NO Sahme Limited | Professional & scientific | 2020 |
| NO.44 Fish Bar Ltd | Hospitality | 2025 |
| NO9 Properties Limited | Real estate | 2023 |
| Nobb Ltd | Wholesale & retail | 2020 |
| Nocton Hall Ltd | Extraterritorial | 2011 |
| Noetarist Ltd | Information & communication | 2025 |
| Nolan Fuel Oils Limited | Wholesale & retail | 1988 |
| Nomad Nick Ltd | Administrative & support | 2025 |
| Nomis Nails L' Atelier Ltd | Other services | 2023 |
| Norphen 3A'S Ltd | Health & social care | 2014 |
| Norris Property Management Ltd | Households | 2025 |
| Norse Industries Limited | Real estate | 2010 |
| North Bicester Physiotherapy Clinic Ltd | Health & social care | 2017 |
| North South Wines Limited | Wholesale & retail | 2014 |
| Norton UK Group Ltd | Construction | 2024 |
| NOT Another London Ltd | Wholesale & retail | 2023 |
| Noticeboardtv Ltd | Information & communication | 2009 |
| Nova Entries Ltd | Information & communication | 2025 |
| Nova Goalkeeping Limited | Wholesale & retail | 2025 |
| Nova Green International Ltd | Professional & scientific | 2024 |
| Novum Cleaning Limited | Administrative & support | 2020 |