| N. I. Optom Ltd | Health & social care | 2023 |
| N.A Murphy Construction Company Limited | Construction | 2022 |
| N.A Property Management Ltd | Real estate | 2018 |
| N.A.M. Transport Solutions Ltd | Transport & logistics | 2021 |
| N.A.S.A Builders Ltd | Construction | 2016 |
| N.A.Transport and Tooling Ltd | Transport & logistics | 2020 |
| N.F Holdings Ltd | Financial services | 2021 |
| N.I Luton Properties Ltd | Real estate | 2024 |
| N.M.J. Motorhouse Limited | Wholesale & retail | 1999 |
| N.M.V Associated Ltd | Administrative & support | 2023 |
| N.P.E.C. (UK) Limited | Wholesale & retail | 1992 |
| N.S. Cladding Solutions Ltd | Construction | 2025 |
| N205 Ltd | Wholesale & retail | 2026 |
| N2M Care Service Limited | Health & social care | 2018 |
| N2M3 Consulting Ltd | Professional & scientific | 2023 |
| N2MV Limited | Real estate | 2021 |
| N9 Motors Ltd | Wholesale & retail | 2025 |
| N91 Ltd | Wholesale & retail | 2026 |
| NA Holdings Limited | Real estate | 2022 |
| NA Numbers Limited | Professional & scientific | 2015 |
| Naaaz Ltd | Wholesale & retail | 2025 |
| Naairporttransfers Ltd | Transport & logistics | 2025 |
| Naarc Ltd | Real estate | 2020 |
| Nabeeljeweller Ltd | Manufacturing | 2024 |
| NAD Construct Ltd | Construction | 2021 |
| NAD Medical Device Consultancy Limited | Professional & scientific | 2013 |
| Nadar Builders & Maintenance Ltd | Construction | 2025 |
| Nadco Limited | Real estate | 2022 |
| Naddy Construction Services Limited | Professional & scientific | 2019 |
| Nadeem Holdings Ltd | Real estate | 2021 |
| Nadeem Plaza Limited | Real estate | 2022 |
| Nadia Care Centre Limited | Extraterritorial | 2011 |
| Nadia Work Ltd | Information & communication | 2024 |
| Nadorr Luxury Ltd | Wholesale & retail | 2021 |
| NAF Property Capital Limited | Real estate | 2023 |
| Naff Co 54 Limited | Wholesale & retail | 2018 |
| Nafisa Umbreen Ltd | Arts & recreation | 2022 |
| Nafisa Umbreen Property Holdings Ltd | Real estate | 2023 |
| Nagul VEG Limited | Wholesale & retail | 2024 |
| NAH Transport Ltd | Transport & logistics | 2019 |
| Nahal Dairy Limited | Wholesale & retail | 2014 |
| Nahammar Ltd | Health & social care | 2023 |
| Nahul Ltd | Wholesale & retail | 2025 |
| Nailed by Zaina Limited | Other services | 2023 |
| Nails Laundry Ltd | Wholesale & retail | 2022 |
| Najaf Auto Repairs Ltd | Wholesale & retail | 2026 |
| Najiha Ltd | Wholesale & retail | 2025 |
| Nakatomi Solutions Limited | Professional & scientific | 2021 |
| Nakheel Ltd | Real estate | 2025 |
| Nakhlat AL Nahreen Group Ltd | Wholesale & retail | 2018 |
| Naky Limited | Wholesale & retail | 2012 |
| Nalain's Group Limited | Transport & logistics | 2022 |
| NAM & KAN Ltd | Hospitality | 2011 |
| Namaa Vibe Ltd | Wholesale & retail | 2025 |
| Namgiles & Co Limited | Professional & scientific | 2022 |
| Nami Limited | Construction | 2026 |
| Namo Gange Wellness Limited | Administrative & support | 2026 |
| Nanak Employment Service Ltd | Construction | 2024 |
| Nanfuka Ltd | Health & social care | 2018 |
| Nans Food Ltd | Agriculture & fishing | 2022 |
| Napier Court Management (Luton) Limited | Households | 1985 |
| Napier Homes Limited | Real estate | 2018 |
| Napier House (LU1) RTM Company Limited | Households | 2023 |
| Nappy Head Limited | Manufacturing | 2004 |
| Narrowgate Assets Ltd | Real estate | 2020 |
| Narrowgate Residential Ltd | Real estate | 2024 |
| Narsa Ltd | Information & communication | 2026 |
| Narya Limited | Real estate | 2011 |
| Narya Retail Limited | Wholesale & retail | 2009 |
| Narya SVP Limited | Real estate | 2015 |
| Narya SVP2 Limited | Real estate | 2021 |
| NAS Fleet Management Limited | Transport & logistics | 2026 |
| NAS Property Holdings Ltd | Real estate | 2025 |
| Nasa Investments Ltd | Real estate | 2016 |
| Nasalin Services Limited | Construction | 2015 |
| Nasar Iqbal Limited | Wholesale & retail | 2025 |
| Nascot Dental Team Training Ltd | Education | 2025 |
| Nashcare 2 Limited | Health & social care | 2021 |
| Nasiha Limited | Education | 2022 |
| Nasinz Interprises Ltd | Wholesale & retail | 2026 |
| Nasojaer Ltd | Real estate | 2024 |
| Nasons Farm Fresh Limited | Manufacturing | 2023 |
| Nasons Performance & Sports Cars Ltd | Wholesale & retail | 2025 |
| Nasons Property Solutions Ltd | Real estate | 2024 |
| Nassaf Limited | Professional & scientific | 2026 |
| Nassir Consultant Ltd | Transport & logistics | 2025 |
| NAT Assets and Properties Limited | Real estate | 2021 |
| NAT Systems Ltd | Information & communication | 2014 |
| Natell Ltd | Wholesale & retail | 2021 |
| Nathalie & Thomas Ltd | Wholesale & retail | 2023 |
| Nathan Arrow Limited | Professional & scientific | 2005 |
| National Care Ltd | Health & social care | 2015 |
| National Property Maintenance Ltd | Households | 2020 |
| National Removal Solutions Ltd | Transport & logistics | 2026 |
| National Resilience Centre C.I.C. | Health & social care | 2025 |
| National Sameday Road Transport Limited | Transport & logistics | 2018 |
| National Sameday Trucking Limited | Transport & logistics | 2017 |
| National Switch Limited | Construction | 2018 |
| Nationwide Driveways Ltd | Administrative & support | 2018 |
| Nationwide Glazing Limited | Construction | 2005 |