| Niraariya Investments Limited | Real estate | 2023 |
| Nirwana Foods Ltd | Wholesale & retail | 2025 |
| Nisa Holdings Limited | Financial services | 2024 |
| Nisa's Fashion and Bridal Limited | Wholesale & retail | 2023 |
| Nisab UK Ltd | Transport & logistics | 2022 |
| Nisha Solutions Ltd | Information & communication | 2016 |
| Nishiban Ltd. | Professional & scientific | 1993 |
| Nismo Transport Ltd | Transport & logistics | 2015 |
| Nissy TEE Ltd | Manufacturing | 2018 |
| Nita Zahir Consulting Ltd | Other services | 2011 |
| Nivaya Ltd | Real estate | 2016 |
| NJ Change Consulting Ltd | Information & communication | 2014 |
| NJ Facilities Management Limited | Real estate | 2026 |
| NJ Productions Limited | Administrative & support | 2015 |
| NJC Estimating Services Limited | Professional & scientific | 2010 |
| NJR London Ltd | Real estate | 2021 |
| NJW Installations Ltd | Manufacturing | 2004 |
| NJW Properties Ltd | Real estate | 2012 |
| NKS Real Estate (SUB) Ltd | Real estate | 2025 |
| NKS Real Estate Ltd | Construction | 2003 |
| NKZ Logistics and Trading Ltd | Wholesale & retail | 2025 |
| NL Consulting Limited | Real estate | 2014 |
| Nlighten Minds Ltd | Wholesale & retail | 2018 |
| Nmabor Services Limited | Health & social care | 2012 |
| Nmad Logistics Ltd | Construction | 2019 |
| NMG Autos UK Ltd | Wholesale & retail | 2019 |
| Nmhyk Ltd | Administrative & support | 2017 |
| NMK Academy Ltd | Other services | 2019 |
| NMK Aesthetics Ltd | Other services | 2019 |
| NMK Properties Ltd | Real estate | 2017 |
| NNA Construction Ltd | Manufacturing | 2024 |
| NO.25 Capital Ltd | Real estate | 2022 |
| Noahbella Ltd | Manufacturing | 2021 |
| Nobel Biocare U.K. Limited | Manufacturing | 1984 |
| Noble Design Build & Renovate Ltd | Construction | 2018 |
| Noble Land & Property Ltd | Real estate | 2017 |
| Nojan Services Limited | Construction | 2020 |
| Nomad Logistics Ltd | Administrative & support | 2017 |
| Nong Gaow Limited | Other services | 2017 |
| Nonstop Ltd | Information & communication | 2019 |
| Noon Products Limited | Manufacturing | 1987 |
| Noor Cars Ltd | Administrative & support | 2021 |
| Noorcap Limited | Real estate | 2023 |
| Nora Electrical Ltd | Construction | 2023 |
| Nordicbee Limited | Wholesale & retail | 2025 |
| Norgine Pharma UK Limited | Wholesale & retail | 2024 |
| Norgine Pharmaceuticals Limited | Wholesale & retail | 1998 |
| North Contracts Limited | Construction | 2013 |
| North East Alexandra Avenue Limited | Professional & scientific | 1996 |
| North Star Risk Management LLP | | 2020 |
| North West London Roofing Ltd | Construction | 2022 |
| Northbanx Systems Consultancy Limited | Information & communication | 2025 |
| Northfields Management Company Limited | Households | 1982 |
| Northstar Datawerks Ltd | Information & communication | 2026 |
| Northstar Road Logistics Ltd | Transport & logistics | 2026 |
| Northwick Park (Chalgarth) Management Company Limited | Households | 1993 |
| Northwood High Street (Management) Company Limited | Households | 2012 |
| Northwood Investment Group Ltd | Real estate | 2024 |
| Notta TAJ Ltd | Administrative & support | 2023 |
| Nova Electronics Ltd | Information & communication | 2022 |
| Nova Engineering Consultants Limited | Professional & scientific | 2026 |
| Nova Healthcare Services Limited | Health & social care | 2021 |
| Nova Marketing Solutions Limited | Administrative & support | 2018 |
| Nova Search Limited | Administrative & support | 2023 |
| Novabrook Enterprises Limited | Real estate | 2017 |
| Novachife Limited | Wholesale & retail | 2025 |
| Novare Solutions Ltd | Professional & scientific | 2025 |
| Novastra-Ai Ltd | Information & communication | 2025 |
| Novel Foods Limited | Manufacturing | 2011 |
| Novira Global Ltd | Professional & scientific | 2023 |
| NP & Co Developers Ltd | Construction | 2024 |
| NP Carpentry Ltd. | Manufacturing | 2019 |
| NP Innovative Interiors Ltd | Manufacturing | 2020 |
| NR Habitat Limited | Real estate | 2021 |
| NR Orion LLP | | 2015 |
| NR Recruits Ltd | Administrative & support | 2025 |
| NR Smarttech Ltd | Other services | 2025 |
| NRC Consultancy Limited | Professional & scientific | 2023 |
| NRD Consultancy Services Limited | Financial services | 2024 |
| Nrithya Sangeetha Academy Limited | Education | 2007 |
| Nrod Limited | Professional & scientific | 2022 |
| Nrpl Ltd | Transport & logistics | 2024 |
| NRS Technologies Ltd | Information & communication | 2018 |
| NRV Ltd | Wholesale & retail | 2020 |
| NS Financials Limited | Financial services | 2013 |
| NS London Consultancy Ltd | Professional & scientific | 2022 |
| NS Property & Estates Limited | Real estate | 2022 |
| NS Staff Agency Limited | Administrative & support | 2021 |
| NS Staff Associates Limited | Administrative & support | 2023 |
| NSB Cleaners Limited | Other services | 2021 |
| NSB Produce Supplies Ltd | Manufacturing | 2025 |
| NSB Security Limited | Arts & recreation | 2021 |
| NSC Estates Ltd | Real estate | 2022 |
| NSE2 Ltd | Transport & logistics | 2026 |
| NSM Construction and Recurtment Limited | Construction | 2025 |
| NSP Transport Ltd | Transport & logistics | 2026 |
| NT Property Development Limited | Real estate | 2024 |
| NU - FX - Limited | Administrative & support | 1997 |
| Nuanyang Building and Interior Ltd | Construction | 2023 |
| Nublar Ltd | Information & communication | 2018 |