| Nagra & Mettla Transport Ltd | Transport & logistics | 2024 |
| NAH Then Ltd | Hospitality | 2025 |
| Nahla Consultancy Limited | Professional & scientific | 2024 |
| Naija FC Sheffield Ltd | Arts & recreation | 2026 |
| Nail Design Salon Ltd | Other services | 2025 |
| Nail Zone Limited | Other services | 2024 |
| Nailbar Spa Limited | Other services | 2014 |
| Nailbarlk Ltd | Other services | 2026 |
| Nailed by Nana Ltd | Other services | 2025 |
| Nails for YOU (UK) Limited | Other services | 2012 |
| Naishan Care Ltd | Health & social care | 2015 |
| NAJ Auto Body Repair Ltd | Wholesale & retail | 2023 |
| Naji Building & Maintenance Limited | Administrative & support | 2013 |
| Najis S4 Limited | Wholesale & retail | 2025 |
| Najjy Ltd | Health & social care | 2024 |
| Naked Events Limited | Administrative & support | 2005 |
| Nali Car Wash Ltd | Administrative & support | 2024 |
| Nali Express Limited | Wholesale & retail | 2021 |
| Naliè Ltd | Education | 2026 |
| Nally Couriers Limited | Transport & logistics | 2019 |
| Nally Limited | Wholesale & retail | 2023 |
| Naly Food Ltd | Wholesale & retail | 2024 |
| NAM Technical Services Limited | Professional & scientific | 2025 |
| Nameshop.Co Ltd | Wholesale & retail | 2024 |
| Namron Ltd | Manufacturing | 1968 |
| NAN House Ltd | Wholesale & retail | 2025 |
| Nanaonestoplounge Ltd | Other services | 2023 |
| Nandi GIZ Limited | Health & social care | 2017 |
| Nannymaya Ltd | Information & communication | 2022 |
| Nanobyte Software Solutions Limited | Information & communication | 2021 |
| Nanoncolytics Ltd | Professional & scientific | 2022 |
| Nanoplas Technologies Ltd | Professional & scientific | 2012 |
| Nanovector Ltd | Information & communication | 2026 |
| Naomiisobel Ltd | Administrative & support | 2025 |
| Naos Osteopathy Limited | Health & social care | 2024 |
| Napa Psyche Ltd | Other services | 2025 |
| Napoli Kebabs Limited | Hospitality | 2023 |
| Napolis Limited | Hospitality | 2010 |
| Naporto Ltd | Hospitality | 2024 |
| Naqqash Pizza Limited | Hospitality | 2025 |
| Naqvi Real Estates Limited | Real estate | 2026 |
| NAR Foods Takeaway Limited | Hospitality | 2024 |
| Naran Group Holdings Ltd | Real estate | 2026 |
| Naran Holdings Chesterfield Ltd | Real estate | 2026 |
| Naran Holdings Ltd | Real estate | 2023 |
| Nardin Bay Ltd | Real estate | 2023 |
| Nari Food Group Ltd | Hospitality | 2024 |
| Narocroc Consulting Limited | Professional & scientific | 2015 |
| Narra Minimarket Limited | Wholesale & retail | 2025 |
| Narratechnic Limited | | 1988 |
| Narrative North Ltd | Information & communication | 2026 |
| Narvitek Ltd | Professional & scientific | 2025 |
| NAS Radmed Ltd | Health & social care | 2019 |
| Nasalyzer Ltd | Manufacturing | 2024 |
| Nasaney Ltd | Professional & scientific | 2024 |
| Naseem Hamed Enterprises Limited | Real estate | 1995 |
| Nash Content Ltd | Professional & scientific | 2024 |
| Nash Shelby Limited | Information & communication | 2020 |
| Nash Software Services Ltd | Information & communication | 2022 |
| Nashaman Properties Limited | Real estate | 2014 |
| Nashiday Ltd | Wholesale & retail | 2025 |
| Nassure Ltd | Wholesale & retail | 2025 |
| NAT Property Solutions Limited | Real estate | 2022 |
| Nat's Clean and Sorted Limited | Administrative & support | 2023 |
| Natalie Cookson Consulting Ltd | Professional & scientific | 2017 |
| Natalie Hattersley Ltd | Financial services | 2017 |
| Natalie Naaman Fitness & Wellness Ltd | Health & social care | 2021 |
| Natasja Fourie Limited | Administrative & support | 2023 |
| Natha Services Limited | Construction | 2025 |
| Nathan GUY Hair Limited | Other services | 2010 |
| Nathan IAN Brammah Limited | Professional & scientific | 2017 |
| Nathan Jordan Ltd | Transport & logistics | 2017 |
| Nathan Patmore Consulting Ltd | Professional & scientific | 2024 |
| Nathan Richardson Hair Ltd | Other services | 2023 |
| Nathan's (Stannington) Ltd | Hospitality | 2014 |
| National Association for Voluntary and Community Action | Other services | 1991 |
| National Blinds Limited | Manufacturing | 2017 |
| National Calibration Ltd | Extraterritorial | 2023 |
| National Campervans Ltd | Manufacturing | 2020 |
| National Education Group Ltd | Education | 2017 |
| National Envelope Surveys (NES) Limited | Professional & scientific | 2026 |
| National Ice Skating Association of the United Kingdom Limited | Arts & recreation | 1992 |
| National Races Ltd | Professional & scientific | 2025 |
| National Skating Association of Great Britain Limited | Professional & scientific | 1985 |
| National Training Solutions Ltd | Extraterritorial | 2016 |
| National Vans Ltd | Wholesale & retail | 2019 |
| Nations and Regions Investments Limited | Financial services | 2023 |
| Nationwide Blinds Ltd | Manufacturing | 2021 |
| Nationwide Centre of Clinical Sexology Ltd | Public administration | 2026 |
| Nationwide Debt Enforcement Agency Limited | Professional & scientific | 2002 |
| Nationwide Recycle Services Ltd | Water & waste | 2013 |
| Nationwide Security Agency Ltd | Administrative & support | 2010 |
| Nationwide Stainless Holdings Limited | Financial services | 2019 |
| Nationwide Steel Buildings Ltd | Construction | 2020 |
| Nationwide Steelbuildingsuk Limited | Construction | 2026 |
| Nationwide Tape & Jointing Limited | Construction | 2018 |
| Nativa Ventures Ltd | Education | 2026 |
| Native Glory Accounting & Services Limited | Professional & scientific | 2002 |
| Natomed Limited | Health & social care | 2018 |
| Natsara Limited | Health & social care | 2019 |