| N3XA Advanced Hydration Limited | Manufacturing | 2026 |
| N5 Limited | Administrative & support | 2002 |
| Nabil Fahmy Enterprises Limited | Health & social care | 2021 |
| Nadan Development Company Limited | Real estate | 1956 |
| Nadeem Noor Business Ltd | Construction | 2019 |
| Nadyaydin Ltd | Professional & scientific | 2024 |
| Nafd Limited | Other services | 2018 |
| Nafd Ventures Limited | Administrative & support | 2016 |
| Nahiyan Property Ltd | Real estate | 2025 |
| Nailed IT Beauty Ltd | Other services | 2025 |
| Nails by Christina Ltd | Other services | 2024 |
| Nails Culture Ltd | Other services | 2021 |
| NAJ Interiors Limited | Construction | 2021 |
| Najieravan Ltd | Education | 2024 |
| Naml Ltd | Health & social care | 2011 |
| Nana Communications Limited | Information & communication | 2018 |
| Nantgarw Ltd | Water & waste | 2006 |
| Napking Sales Limited | Manufacturing | 1993 |
| Napp Comfort Ltd | Wholesale & retail | 2025 |
| Napton Property Investments Limited | Real estate | 2016 |
| Naqvi Holdings Limited | Real estate | 2021 |
| Narayan Limited | Financial services | 2018 |
| Narborough Court Limited | Households | 1996 |
| Nareshd Consultancy Limited | Professional & scientific | 2022 |
| Naseeb Ecom Ltd | Wholesale & retail | 2025 |
| Nash Holdings Ltd | Real estate | 2021 |
| Nash Locums Limited | Health & social care | 2011 |
| Nasihah Ltd | Professional & scientific | 2020 |
| Nasima Limited | Extraterritorial | 2014 |
| Nasir's Nest Ltd | Real estate | 2021 |
| Naskin Clinic Ltd | Other services | 2026 |
| Natalie Fisk Creative Ltd | Professional & scientific | 2020 |
| Natas (UK) Ltd | Extraterritorial | 2011 |
| Natas Asbestos:Training Ltd | Water & waste | 2010 |
| Nathan Oldfield Consulting Ltd | Information & communication | 2010 |
| Nathan Oldfield Property Ltd | Real estate | 2023 |
| National Association of Funeral Directors | Other services | 2017 |
| National Building Plastics Limited | Extraterritorial | 2023 |
| National Conference Centre Limited | Hospitality | 2015 |
| National Forum of Engineering Centres | Education | 2004 |
| National Hire Solutions Limited | Administrative & support | 2020 |
| National Motorcycle Museum (Services) Limited(The) | Wholesale & retail | 1984 |
| National Oak Structures Limited | Wholesale & retail | 2024 |
| National Plastics (Building Products) Limited | Extraterritorial | 2016 |
| National Plastics Limited | Extraterritorial | 2019 |
| National Skills Academy for Power Limited | Other services | 2010 |
| Nationwide Accessories Ltd | Wholesale & retail | 2026 |
| Nationwide Collections Limited | Wholesale & retail | 2016 |
| Nationwide Support Specialists Limited | Administrative & support | 2024 |
| Nationwide Tracing Services Ltd | Information & communication | 2015 |
| Nationwide Transport Services Limited | Transport & logistics | 2025 |
| Native Systems Limited | Information & communication | 1995 |
| Natural Health Products Limited | Wholesale & retail | 1989 |
| Natural Nails Olton Ltd | Other services | 2023 |
| Natural Treatment Clinic Ltd | Health & social care | 2023 |
| Nature's Gift Limited | Wholesale & retail | 2016 |
| Nature's Own Prescriptions CIC | Education | 2026 |
| Nature's Science Ltd | Other services | 2018 |
| Naughty Chocolate Ltd | Wholesale & retail | 2018 |
| Naughty Panda Limited | Hospitality | 2023 |
| Naughty Prawn Ltd | Information & communication | 2019 |
| NAV Hussain Ltd | Manufacturing | 2016 |
| Navigation Wealth Management Limited | Professional & scientific | 2019 |
| Navtech Engineering Services Limited | Other services | 2004 |
| Navtech Systems Limited | Manufacturing | 2024 |
| Navtrad Limited | Extraterritorial | 2012 |
| Nawazk Medics Ltd | Health & social care | 2022 |
| NB TTN Properties Limited | Real estate | 2024 |
| NBA Capital 2 Ltd | Real estate | 2022 |
| NBA Capital 3 Ltd | Real estate | 2024 |
| NBA Capital Ltd | Real estate | 2017 |
| NBK Recycling UK Limited | Water & waste | 2017 |
| NC IT Limited | Information & communication | 2015 |
| Ncbf | Arts & recreation | 2004 |
| Ncbf Trading Limited | Professional & scientific | 2004 |
| NCH Consultancy Services Limited | Professional & scientific | 2008 |
| NCL Workspace Limited | Wholesale & retail | 2002 |
| Nearperfect Limited | Wholesale & retail | 2001 |
| Need Construction Ltd | Construction | 2023 |
| Nefyn Limited | Professional & scientific | 2011 |
| Negative Entries Ltd | Financial services | 2025 |
| Nehanethra Limited | Real estate | 2023 |
| Neil Freeman Design Limited | Manufacturing | 2002 |
| Neil Kimberley Coaching Limited | Professional & scientific | 2012 |
| Neilsons Recycling Limited | Wholesale & retail | 2014 |
| Nela Owen Ltd | Professional & scientific | 2014 |
| Nella Consulting Ltd | Information & communication | 2011 |
| Nels Logistics Ltd | Transport & logistics | 2020 |
| Nelson Lighting (Commercial) Limited | Extraterritorial | 2011 |
| Nelson Lighting Company Limited | Wholesale & retail | 1996 |
| NEO Aesthetics Ltd | Other services | 2020 |
| NEO Foodhalls Limited | Hospitality | 2020 |
| Neocare UK Limited | Wholesale & retail | 2006 |
| Neocleous Properties Ltd | Real estate | 2023 |
| Neocloud Limited | Information & communication | 2024 |
| Neom Change Consulting Limited | Professional & scientific | 2022 |
| Nerdy Banana Limited | Wholesale & retail | 2013 |
| Nesh Duck Ltd | Real estate | 2021 |
| Nest & Growth Limited | Real estate | 2023 |
| Nest Ground Ltd | Real estate | 2025 |