| Nawin Ltd | Wholesale & retail | 2023 |
| Nawotrans Ltd | Transport & logistics | 2020 |
| Nayla Trading Limited | Wholesale & retail | 2015 |
| NAZ Security Solutions Ltd | Administrative & support | 2022 |
| Nazareth Holding Ltd | Financial services | 2024 |
| ND Autocare Ltd | Wholesale & retail | 2022 |
| Nd-Windows Ltd | Construction | 2014 |
| NDB Foods Ltd | Hospitality | 2022 |
| Neagu Building Ltd | Construction | 2023 |
| Neatshore Limited | Real estate | 1992 |
| Nectuu Limited | Other services | 2026 |
| Nefertiti Gold Ltd | Manufacturing | 2015 |
| NEK Trans Ltd | Transport & logistics | 2015 |
| Nelky Corp Limited | Real estate | 2026 |
| Neodymium Ltd | Wholesale & retail | 2025 |
| Neofood Ltd | Hospitality | 2024 |
| Nepalese Doctors Association (UK) Limited | Other services | 2026 |
| Nepalese Entrepreneur Network in the UK Ltd | Other services | 2020 |
| Nepta Solutions Ltd | Information & communication | 2024 |
| Nest and Legacy Property Ltd | Construction | 2025 |
| Nestled Flames Ltd | Extraterritorial | 2024 |
| Netacademy Ltd | Education | 2014 |
| Netbasic Solutions Limited | Information & communication | 2008 |
| Nevaura Digital Limited | Information & communication | 2026 |
| Nevermiss Automations Ltd | Information & communication | 2026 |
| Nevil Ltd | Construction | 2026 |
| New Chicken Limited | Wholesale & retail | 2020 |
| New Control Limited | Construction | 2012 |
| New Perfect Space Ltd | Construction | 2025 |
| New Shoreham Investments Limited | Real estate | 2010 |
| New Style Salon Ltd | Other services | 2019 |
| New United Marketing Ltd | Real estate | 2018 |
| New Xlka Limited | Administrative & support | 2012 |
| Newform London Ltd | Construction | 2007 |
| Newmake Furniture Ltd | Wholesale & retail | 2014 |
| Newsource Systems Limited | Wholesale & retail | 2012 |
| Newyork Designs Ltd | Wholesale & retail | 2014 |
| Nexarive Ltd | Manufacturing | 2023 |
| Nexbrite Limited | Wholesale & retail | 2025 |
| Nexgen UK Investments Limited | Financial services | 2021 |
| Next House Estate Limited | Real estate | 2025 |
| Next Life Materials Ltd | Water & waste | 2025 |
| Next Mile Consulting Limited | Information & communication | 2025 |
| Next Stepp Recruitment Limited | Administrative & support | 2025 |
| Nexus Reach Ltd | Professional & scientific | 2024 |
| Nexus Recovery Ltd | Transport & logistics | 2026 |
| NIA Retail Ltd | Wholesale & retail | 2026 |
| Niall Ferguson Limited | Professional & scientific | 2011 |
| Nice Frames Construction Ltd | Construction | 2023 |
| Nicholas Court (Management) Limited | Households | 1957 |
| Nick Stick Ltd | Construction | 2023 |
| Nicky B Ltd | Administrative & support | 2012 |
| Nico & Nunzi (Holdings) Limited | Professional & scientific | 2009 |
| Nicole Zysk Aesthetics Ltd | Other services | 2020 |
| Nieman Property Limited | Real estate | 2024 |
| Nieman Rehabilitation Ltd | Health & social care | 2021 |
| Nightjobz Ltd | Administrative & support | 2025 |
| Nikita Kochhar Ltd | Real estate | 2024 |
| Niko Building Ltd | Construction | 2016 |
| Nikoloff Limited | Transport & logistics | 2017 |
| Nilaverse Ltd | Manufacturing | 2025 |
| Nime Food & Wine Ltd | Wholesale & retail | 2025 |
| Nimka Life Ltd | Professional & scientific | 2015 |
| Nirbhau Nirvair Logistics Ltd | Transport & logistics | 2024 |
| Nirruthya Kshetraa Ltd | Arts & recreation | 2026 |
| Nirvaan Accessories Limited | Wholesale & retail | 2019 |
| Nirvik Consulting Ltd | Professional & scientific | 2025 |
| Nisany Property Ltd | Real estate | 2023 |
| Nish P Consultancy Ltd | Professional & scientific | 2019 |
| Nishra Ltd | Real estate | 2021 |
| NJ London Limited | Wholesale & retail | 2024 |
| NK Building and Decoration Ltd | Construction | 2018 |
| NK Properties London Ltd | Real estate | 2021 |
| NKM Properties Management Ltd | Construction | 2010 |
| Nmvb Finance Limited | Financial services | 2023 |
| Nmvb Properties Limited | Real estate | 2023 |
| Nn&Sp Properties Ltd | Households | 2025 |
| Nnateghian Limited | Health & social care | 2026 |
| Nnfresh Ltd | Administrative & support | 2021 |
| Noah Autos Ltd | Construction | 2024 |
| Nobel EV Parts Ltd | Wholesale & retail | 2026 |
| Noborderline Ltd | Wholesale & retail | 2026 |
| Nommies Ltd | Extraterritorial | 2018 |
| Noor AL Qamar Limited | Wholesale & retail | 2025 |
| Noor E Ishq Ltd | Wholesale & retail | 2025 |
| Noor Fragrance Limited | Manufacturing | 2024 |
| Noor’S Halal Food Ltd | Hospitality | 2025 |
| Norah International Ltd | Wholesale & retail | 2022 |
| Noravision Limited | Administrative & support | 2025 |
| Norben Developments Limited | Construction | 1999 |
| North African Plastics Trading Company Ltd | Wholesale & retail | 2021 |
| Nosh N Go Express Ltd | Hospitality | 2022 |
| Notting Hill Accounting Ltd | Professional & scientific | 2026 |
| Notting Hill Medical Limited | Health & social care | 2024 |
| Nova Door and Windows Ltd | Construction | 2026 |
| Novamarsh Limited | Other services | 2017 |
| Novaturient Tours & Travel Limited | Administrative & support | 2020 |
| NOW Properties Ltd | Real estate | 2018 |
| NR Automotive Ltd | Wholesale & retail | 2020 |
| NRM Limited | Construction | 2019 |