| Newmax Solutions Limited | Health & social care | 2012 |
| Newminerals Ltd | Manufacturing | 2025 |
| Nexaglow Ltd | Wholesale & retail | 2026 |
| Next 2 Best Ltd | Transport & logistics | 2025 |
| Next Level Properties Ltd | Financial services | 2021 |
| Nextgen Technologies Ltd | Administrative & support | 2016 |
| Nexus Group Technologies Limited | Information & communication | 2009 |
| Nexus Managed Solutions Limited | Information & communication | 1997 |
| Neykov Limited | Construction | 2023 |
| NFM Group Limited | Administrative & support | 2018 |
| NFM Pinnacle Ltd | Other services | 2012 |
| Ngen Ventures Ltd | Construction | 2022 |
| NGR Chains Limited | Wholesale & retail | 2020 |
| NGT Solutions Ltd | Construction | 2011 |
| Nguk & Pro Aspect Partners Ltd | Manufacturing | 2025 |
| Nguk Group Limited | Construction | 2023 |
| Nguk Limited | Construction | 2020 |
| NH Capital Women's Sports Holdings Ltd | Financial services | 2026 |
| Niaz Ltd | Wholesale & retail | 2026 |
| Nick Barton Design Limited | Professional & scientific | 2008 |
| Nick Blakemore Limited | Information & communication | 2017 |
| Nick Coomer Building Limited | Construction | 2011 |
| Nick Interiors Ltd | Construction | 2015 |
| Nick LNT Limited | Transport & logistics | 2023 |
| Nick Property UK Limited | Real estate | 2024 |
| Nickfield Merchants Self Drive Ltd | Transport & logistics | 2025 |
| Nicks Plumbing Limited | Construction | 2023 |
| Nicku Construction Ltd | Construction | 2022 |
| Night Life Inflatable Events Limited Partnership | | 2023 |
| Nike Idialu-Ikato & Co Ltd | Health & social care | 2009 |
| Nikjl Limited | Construction | 2006 |
| Nikolayvornikov Ltd | Construction | 2025 |
| Nikos & Afrodite Ltd | Health & social care | 2025 |
| Nilex Ltd | Wholesale & retail | 2026 |
| Niman Group Ltd | Construction | 2023 |
| Nine Cubed Ltd | Financial services | 2025 |
| Nine Lions Property Investors and Developers Ltd | Real estate | 2022 |
| Nineteen Hair & Beauty Limited | Other services | 2017 |
| Ninitots Limited | Wholesale & retail | 2020 |
| NIP E DAJ Properties Ltd | Real estate | 2024 |
| Nishan Tandoori Ltd | Hospitality | 2023 |
| Nitmerforms Developments Limited | Real estate | 1963 |
| Nitro-Palette Limited | Information & communication | 2025 |
| Nitrovery Limited | Information & communication | 2017 |
| Niya Nine Ltd | Wholesale & retail | 2026 |
| Nizm Holdings Limited | Real estate | 2016 |
| Nizm Limited | Information & communication | 2012 |
| NJ Henry Contracts Limited | Construction | 2008 |
| NJ Henry Properties Ltd | Real estate | 2019 |
| NJH Contracts Ltd | Construction | 2025 |
| NJS Haulage Limited | Transport & logistics | 2024 |
| NK Interim Management & Consultancy Limited | Professional & scientific | 2022 |
| NK Physiotherapy Ltd | Other services | 2014 |
| NK Vapes London Ltd | Wholesale & retail | 2025 |
| NLM Freight Group Ltd | Transport & logistics | 2016 |
| NLS Carpentry & Joinery Ltd | Construction | 2018 |
| NM Style Limited | Other services | 2015 |
| NNJ Properties Ltd | Real estate | 2017 |
| NO More Leaks 24/7 Ltd | Hospitality | 2024 |
| NO2 Nails Ltd | Other services | 2023 |
| Noar Design & Build Ltd | Construction | 2023 |
| Noble & Sons Construction Ltd | Construction | 2025 |
| Nocturn Music Group Limited | Professional & scientific | 2020 |
| Noire Graft Limited | Transport & logistics | 2018 |
| Nokken Cabins Limited | Professional & scientific | 2024 |
| Noma Legal Ltd | Professional & scientific | 2025 |
| Nopeterno Limited | Professional & scientific | 2019 |
| Nordica LUX Rides Limited | Transport & logistics | 2023 |
| North London Care (Havering) Ltd | Health & social care | 2006 |
| Northbanq Ventures Ltd | Professional & scientific | 2025 |
| Northo Limited | Financial services | 2010 |
| Norwich Dental Implant Centre Limited | Health & social care | 2008 |
| Norwich Dental Spa Limited | Health & social care | 2007 |
| NOT Just Lettings Ltd | Real estate | 2023 |
| Nougaire Ltd | Professional & scientific | 2023 |
| NOUGHT4 Ltd | Information & communication | 2020 |
| Nova Berry Services Ltd | Administrative & support | 2025 |
| Nova Lets Ltd | Real estate | 2025 |
| Nova Prospect Ltd | Hospitality | 2023 |
| NOVA360 Ltd | Construction | 2018 |
| Novakayaldn Ltd | Wholesale & retail | 2024 |
| Novatel Systems Limited | Information & communication | 1998 |
| NOW Street Foods Ltd | Hospitality | 2019 |
| Nowa Art Studio Limited | Arts & recreation | 2023 |
| Nowtri Ltd | Wholesale & retail | 2022 |
| NP Property Solutions Limited | Financial services | 2025 |
| NP3 Services Limited | Administrative & support | 2017 |
| NR Heating Ltd | Construction | 2011 |
| NRGR8 Limited | Administrative & support | 2005 |
| NS Digital Ltd | Wholesale & retail | 2023 |
| Nshilpi Properties Limited | Real estate | 2022 |
| NSL Cross Border Services Limited | Real estate | 2006 |
| NU Bunk Ltd | Real estate | 2026 |
| NUA Mortgage Services Limited | Financial services | 2017 |
| Nuby Services Limited | Real estate | 2018 |
| Nucassa Developments Ltd | Construction | 2025 |
| Nugen Energy Services Limited | Administrative & support | 2011 |
| Nutralfa Ltd | Wholesale & retail | 2018 |
| Nutrition Kitchen Ltd | Education | 2020 |
| Nuvex Build Ltd | Construction | 2026 |