| North Yorkshire 3D Printing Ltd | Professional & scientific | 2025 |
| North-South Group Ltd | Information & communication | 2025 |
| Northbound Consulting Ltd | Professional & scientific | 2026 |
| Northbrook Holdings Ltd | Financial services | 2025 |
| Northern Hospitality Band Ltd | Arts & recreation | 2025 |
| Northern Parties Ltd | Administrative & support | 2026 |
| Northern Software Systems Ltd | Information & communication | 2025 |
| Northern Songs Limited | Wholesale & retail | 2016 |
| Northern Water Limited | Construction | 2025 |
| Northfield View Apartments Resident Management Co Ltd | Households | 2025 |
| Northgate Building Limited | Construction | 2023 |
| Northgate Consultancy Limited | Professional & scientific | 2024 |
| Northgate Recruitment Ltd | Administrative & support | 2026 |
| Northjet Pressure Cleaning Ltd | Administrative & support | 2025 |
| Northland (Beverley) Limited | Construction | 2022 |
| Northland (Brandeston) Limited | Construction | 2020 |
| Northland (Chiltern) Ltd | Construction | 2002 |
| Northland (Newton) Limited | Construction | 2018 |
| Northland Property Investments Limited | Real estate | 2020 |
| Northland Thame LLP | | 2010 |
| Northmead Limited | Other services | 2021 |
| Northrock Estates Limited | Real estate | 2025 |
| Northstar Collaboration Limited | Information & communication | 2022 |
| Northwood Management Company Limited | Households | 2004 |
| Norton Rise Limited | Construction | 2023 |
| Norvaneae Ltd | Wholesale & retail | 2026 |
| Norwood Street Ltd | Real estate | 2022 |
| Nosh Markets Limited | Information & communication | 2018 |
| NOT a Robot Studio Ltd | Professional & scientific | 2025 |
| NOT Little for Long Photography Limited | Professional & scientific | 2025 |
| Notes on MEN Ltd | Arts & recreation | 2025 |
| Notley & Co Ltd | Construction | 2019 |
| Notley Heights Management Company Limited | Real estate | 2001 |
| Notretaw Ltd | Real estate | 2025 |
| Noureen Asif & Co Ltd | Wholesale & retail | 2025 |
| Nourish Peckham CIC | Hospitality | 2026 |
| Nova Bridge Venture Limited | Information & communication | 2025 |
| Nova Cloud Solutions Ltd | Information & communication | 2025 |
| Nova Digital Ltd | Information & communication | 2013 |
| Nova Iter Limited | Information & communication | 2026 |
| Nova Motorhouse Ltd | Wholesale & retail | 2025 |
| Nova Research Supply Ltd | Wholesale & retail | 2026 |
| Novaapex Trade Ltd | Wholesale & retail | 2026 |
| Novaciri Ltd | Wholesale & retail | 2023 |
| Novaclinicsuk Ltd | Health & social care | 2025 |
| Novainno UK Ltd | Wholesale & retail | 2025 |
| Novaki Home Limited | Real estate | 2025 |
| Novalink Ventures Ltd | Professional & scientific | 2026 |
| Novanna Limited | Wholesale & retail | 1989 |
| Novanorth Partners Limited | Real estate | 2025 |
| Novaspora Solutions Limited | Professional & scientific | 2026 |
| Novastaff Solutions Ltd | Administrative & support | 2025 |
| Novocase Limited | Manufacturing | 2025 |
| Novregen Advisory Limited | Professional & scientific | 2025 |
| Nowton Spice Ltd | Hospitality | 2026 |
| NOX Codex Ltd | Information & communication | 2026 |
| NOX Consulting Ltd | Information & communication | 2020 |
| Noxtrium Records Ltd | Wholesale & retail | 2025 |
| Noya Property Management Ltd | Real estate | 2020 |
| NP Financial Services Ltd | Financial services | 2024 |
| NPL Trading Company Ltd | Wholesale & retail | 2023 |
| NR Media Ltd | Professional & scientific | 2025 |
| Nscom Ltd | Wholesale & retail | 2026 |
| NSK Building Services Limited | Construction | 2021 |
| NT & Partners London Limited Liability Partnership | | 2007 |
| NTB Consultants LLP | | 2008 |
| NTB Holdings Limited | Real estate | 2021 |
| NTB Limited | Financial services | 2025 |
| Nteg Ltd | Wholesale & retail | 2020 |
| NTH Cube Limited | Information & communication | 2018 |
| Ntroulias ENG Services Ltd | Professional & scientific | 2019 |
| Nube A-B Ltd | Professional & scientific | 2012 |
| NUBEING9 Studios Ltd | Arts & recreation | 2025 |
| Nucontext Agency Ltd | Professional & scientific | 2025 |
| Nudora Group Ltd | Information & communication | 2025 |
| Nuevoz Post Production Limited | Information & communication | 2023 |
| Nuggs 1268 Limited | Hospitality | 2018 |
| Nulty Limited | Real estate | 2024 |
| Numa Talent Ltd | Administrative & support | 2026 |
| Numbelievable Ltd | Wholesale & retail | 2026 |
| Number 300 Ltd | Professional & scientific | 2010 |
| Number 4 Consulting Limited | Other services | 2019 |
| NUMBER70 Ltd | Administrative & support | 2011 |
| Nupipeco Ltd | Wholesale & retail | 2026 |
| NUR Guides Ltd | Administrative & support | 2024 |
| Nura SOS Limited | Wholesale & retail | 2026 |
| Nurem Industrial UK Limited | Manufacturing | 2025 |
| Nuroli Ltd | Information & communication | 2026 |
| Nursing Career Coach UK Limited | Professional & scientific | 2025 |
| Nurture Children's Care Limited | Health & social care | 2024 |
| Nurture Corporation Ltd | Information & communication | 2025 |
| Nurturewell CIC | Education | 2025 |
| Nusia Ltd | Wholesale & retail | 2021 |
| Nutbrook Holdings Limited | Real estate | 2019 |
| Nutbrook Investments Ltd | Real estate | 2019 |
| Nutbrook Property Limited | Real estate | 2019 |
| Nutworth Ltd | Information & communication | 2023 |
| Nuumi Limited | Arts & recreation | 2019 |
| Nuvanti Limited | Administrative & support | 2018 |
| Nuxela Ltd | Information & communication | 2025 |