| Nextlevel Creator Network Ltd | Professional & scientific | 2025 |
| Nexus 2020 Limited | Households | 2009 |
| Nexus Building Solutions Limited | Construction | 2010 |
| Nexus Interim Executives Ltd. | Other services | 2018 |
| Nexus Interiors Ltd | Construction | 2023 |
| Nexus Roof Windows Limited | Construction | 2021 |
| Nexus UK Capital Limited | Households | 2016 |
| Nhmd Ltd | Manufacturing | 2012 |
| NI ANN Limited | Professional & scientific | 2024 |
| Niam Lettings Ltd | Real estate | 2019 |
| Niche Weddings & Events Ltd | Wholesale & retail | 2020 |
| Nichola Jane Limited | Other services | 2021 |
| Nicholas Brooks Kitchens & Bedrooms Ltd | Construction | 2018 |
| Nicholas JON Recruitment Limited | Administrative & support | 2008 |
| Nick Avery Ltd | Information & communication | 2004 |
| Nicks Barber Ltd | Other services | 2020 |
| Nicks Hair and Beauty Salon Limited | Other services | 2013 |
| Nicola Clarke Communications Ltd | Professional & scientific | 2025 |
| Nigel & Roberts Ltd | Real estate | 2023 |
| Nigel Heron Properties Ltd | Construction | 2004 |
| Nigel Markham Limited | Construction | 2009 |
| Nijco Properties Limited | Real estate | 2023 |
| Nijjar Developments Limited | Real estate | 2022 |
| Nimar Ltd | Wholesale & retail | 2025 |
| Nine Hills Consulting Limited | Information & communication | 2022 |
| Nine Mine Iron Ltd | Manufacturing | 2015 |
| Nineteen Seventy Seven Holdings Limited | Administrative & support | 2024 |
| Nishan Cash & Carry Ltd | Wholesale & retail | 2022 |
| Njay Holdings Ltd | Real estate | 2022 |
| Njay Investments Ltd | Real estate | 2017 |
| NJC Holding Limited | Professional & scientific | 2022 |
| NJC Retail Solutions Ltd | Professional & scientific | 2019 |
| Njord Survey Ltd | Mining & quarrying | 2023 |
| NJW Landscape Solutions Ltd | Professional & scientific | 2018 |
| NKA Project Innovations Limited | Information & communication | 2025 |
| NKB Interiors Ltd | Construction | 2025 |
| NKD Consultants Limited | Professional & scientific | 2017 |
| NKH Legal Limited | Professional & scientific | 2025 |
| NKL Pharma Consulting Ltd | Professional & scientific | 2025 |
| NLX Consultancy and Training Ltd | Professional & scientific | 2026 |
| NNK Family Ltd | Wholesale & retail | 2026 |
| NO 1 Management Limited | Real estate | 2017 |
| NO 3 Dale Street, Leamington Spa Freehold Company Limited | Households | 2009 |
| NO Escape Aldgate Limited | Arts & recreation | 2023 |
| NO Escape Coffee Limited | Hospitality | 2023 |
| NO Escape Limited | Arts & recreation | 2017 |
| NO Escape Trafalgar Square Limited | Arts & recreation | 2023 |
| NO Escape Victoria Limited | Arts & recreation | 2021 |
| NO Revs Limited | Information & communication | 2025 |
| NO.4 CT Limited | Real estate | 2021 |
| Noahs Eco Nest Limited | Manufacturing | 2025 |
| Nobel Autoparts U.K. Limited | Manufacturing | 2007 |
| Nobel Holding Group Limited | Professional & scientific | 2013 |
| Noise Rating Ltd | Extraterritorial | 2023 |
| Noisy Pixels Ltd | Construction | 2026 |
| Nomad Rush Limited | Professional & scientific | 2024 |
| Nook Kitchens & Bathrooms Ltd | Manufacturing | 2019 |
| Nool & Noble Ltd | Manufacturing | 2026 |
| Nordalp UK Ltd | Information & communication | 2025 |
| Nordic Walking UK Limited | Arts & recreation | 2008 |
| Northbound Supply Limited | Professional & scientific | 2026 |
| Northleach Court Care Home Limited | Health & social care | 2018 |
| Northstar Connect Staffing Ltd | Information & communication | 2014 |
| Nostradamus Consulting Limited | Professional & scientific | 2019 |
| Notanotherchair Ltd | Manufacturing | 2018 |
| Notice Board Company (UK) Ltd | Wholesale & retail | 2002 |
| Notion Holdings Limited | Financial services | 2018 |
| Notion Limited | Professional & scientific | 2002 |
| Novo Heat Limited | Professional & scientific | 2024 |
| Novus Creo Consulting Limited | Professional & scientific | 2025 |
| Nowgem Int'L Limited | Real estate | 2017 |
| Nowgems Ltd | Professional & scientific | 2025 |
| NPW Associates Limited | Administrative & support | 2020 |
| Nrg-Fuels(Uk) Limited | Wholesale & retail | 2024 |
| NRJ Consultants Limited | Water & waste | 2014 |
| NRL Creative & Design Limited | Professional & scientific | 2012 |
| Nrsh Limited | Hospitality | 2014 |
| Nskl Ltd | Construction | 2026 |
| NST Publishing Ltd | Administrative & support | 2015 |
| Nulogic Holdings Limited | Financial services | 2026 |
| Nulogic Training Limited | Other services | 2017 |
| Number 54 Elsham Road Limited | Households | 1992 |
| Nupac Limited | Manufacturing | 2015 |
| Nurol Makina UK Ltd | Manufacturing | 2023 |
| Nursegate UK Ltd | Administrative & support | 2021 |
| Nutrition Ambition Ltd | Wholesale & retail | 2023 |
| Nuvitrace Limited | Wholesale & retail | 2026 |
| Nuvo Creative Limited | Professional & scientific | 2012 |
| Nuwa Perfumes Ltd | Manufacturing | 2025 |
| Nvance Limited | Information & communication | 2015 |
| Nvous Films Limited | Information & communication | 2003 |
| NWM United Ltd | Information & communication | 2022 |
| Nycg Ltd | Professional & scientific | 2015 |
| Nylander Pearl Ltd | Information & communication | 2020 |
| Nzed Projectco 1 Limited | Energy | 2022 |
| Nzed Projectco 10 Limited | Energy | 2026 |
| Nzed Projectco 11 Limited | Energy | 2026 |
| Nzed Projectco 2 Limited | Energy | 2022 |
| Nzed Projectco 3 Limited | Energy | 2022 |
| Nzed Projectco 4 Limited | Energy | 2024 |