| N&P Crayford MRF Limited | Water & waste | 2021 |
| N&P Feedstock Hooton Ltd | Water & waste | 2017 |
| N&P Feedstock Pcel Ltd | Water & waste | 2020 |
| N&P Hartlepool MRF Ltd | Water & waste | 2023 |
| N&P TSP Holdings Ltd | Financial services | 2021 |
| N&P UK Holding Ltd | Financial services | 2017 |
| N&P UK Production Holding Ltd | Financial services | 2017 |
| N-Able UK Tech Ltd | Health & social care | 2020 |
| N-Ableuk Ltd | Health & social care | 2018 |
| N.B.C. (Air Conditioning) Limited | Energy | 2004 |
| N.K Hughes Cars Ltd | Transport & logistics | 2025 |
| N3 Group MCR Ltd | Professional & scientific | 2025 |
| N8 Ductwork Limited | Construction | 2025 |
| Nachiappa's Ltd | Information & communication | 2011 |
| Naddproperties Ltd | Real estate | 2022 |
| Nagra Retail Limited | Wholesale & retail | 2024 |
| Nahar Lael Ltd | Professional & scientific | 2024 |
| Nailswag Limited | Other services | 2013 |
| Najd Properties Limited | Real estate | 2017 |
| Najm Consultancy Limited | Professional & scientific | 2026 |
| Naked Frank Theatre | Arts & recreation | 2020 |
| Naked Politics CIC | Education | 2020 |
| Naked Politics Media Ltd | Information & communication | 2025 |
| Nakia Physio Limited | Health & social care | 2025 |
| Naksh Infotech Limited | Information & communication | 2018 |
| Namaste Digital UK Ltd | Information & communication | 2025 |
| Nandra Chauffeur Services Limited | Transport & logistics | 2021 |
| Nanomatic Limited | Information & communication | 2020 |
| Naodav Properties Limited | Real estate | 2023 |
| Narteh Transport Services Ltd | Transport & logistics | 2020 |
| Naryanone Ltd | Construction | 2023 |
| Nasi Isda Uxbridge Ltd | Hospitality | 2025 |
| Nasrul-Lahi-Il-Fatih Society of Nigeria United Kingdom & Ireland | Other services | 2004 |
| Natcat Films Ltd | Information & communication | 2023 |
| Nathalie Boon Co. Ltd | Real estate | 2024 |
| Natharinie SRI Co. Ltd | Real estate | 2024 |
| National Business Communications Ltd | Administrative & support | 2018 |
| National Maritime Limited | Administrative & support | 2019 |
| National Traffic Management Ltd | Public administration | 2018 |
| Nationwide Fostering Limited | Health & social care | 2019 |
| Natural Edge Media Ltd | Information & communication | 2011 |
| Natural Mountains Ltd | Wholesale & retail | 2021 |
| Natural Stone Installers Limited | Construction | 2015 |
| Natvis Ltd | Other services | 2010 |
| Naul Road Development Ltd | Construction | 2016 |
| Navidesa Ltd | Health & social care | 2018 |
| Navigator Records Limited | Extraterritorial | 2007 |
| Navisys Ltd | Information & communication | 2026 |
| Navya Ventures Ltd | Real estate | 2023 |
| Nazir Logistics Limited | Transport & logistics | 2020 |
| NBS Partners Limited | Administrative & support | 2012 |
| NC Homes( UK) Limited | Real estate | 2024 |
| Nccl Planning Consultants Ltd | Professional & scientific | 2021 |
| NCK Pest Proofing and Property Maintenance Solutions Ltd | Construction | 2024 |
| NCL Bytebridge Ltd | Wholesale & retail | 2025 |
| Ncssitis Ltd | Information & communication | 2023 |
| ND Bell Construction Ltd | Construction | 2014 |
| NDA International Limited | Wholesale & retail | 2018 |
| Nddl Limited | Hospitality | 2022 |
| Nebula Luxe Properties Ltd | Real estate | 2024 |
| Nebutek Limited | Administrative & support | 2011 |
| NEE Consultancy Limited | Information & communication | 2022 |
| Neefah Signature Ltd | Wholesale & retail | 2021 |
| Neemkaroli IT Ltd | Information & communication | 2025 |
| Neil Biddle Tennis Limited | Arts & recreation | 2022 |
| Neil Harris Consulting Ltd | Construction | 2018 |
| NEL Haven Ltd | Wholesale & retail | 2026 |
| Nemo's Removals Ltd | Transport & logistics | 2020 |
| Nemos Removals Domestic Ltd | Transport & logistics | 2021 |
| Neon Flamingo Limited | Information & communication | 2017 |
| Nepicar Sand Ltd | Mining & quarrying | 2008 |
| Nero Premium Ltd | Wholesale & retail | 2025 |
| Nerva Holdings Ltd | Real estate | 2023 |
| Nest Sphere London Ltd | Households | 2026 |
| Nestamedia Studios Limited | Information & communication | 2014 |
| Nested Healthcare Services Ltd | Health & social care | 2024 |
| NET Church Dartford Limited | Other services | 2011 |
| Netcare Service Limited | Information & communication | 2023 |
| Netsolandsec Ltd | Information & communication | 2012 |
| Netwall Limited | Administrative & support | 2010 |
| Network of Nigerian Teachers in the Diaspora-Nntd Ltd | Education | 2025 |
| Neuera Packaging Ltd | Manufacturing | 2014 |
| Nevaeh Niks Ltd | Other services | 2021 |
| Neven Construction Ltd | Construction | 2023 |
| Neverfailing Motors Ltd | Wholesale & retail | 2021 |
| New 4 Growth Ltd | Wholesale & retail | 2020 |
| New Abingdon Sushi Ltd | Wholesale & retail | 2020 |
| New Begin Properties Limited | Real estate | 2014 |
| New Beginnings Ventures Limited | Real estate | 2025 |
| New Connections Support C.I.C. | Health & social care | 2021 |
| New Creations Collective Ltd | Arts & recreation | 2020 |
| New Form Plumbing Ltd | Construction | 2017 |
| New Headington Sushi Ltd | Wholesale & retail | 2024 |
| New High Wycombe Sushi Ltd | Wholesale & retail | 2024 |
| New Homes Group London Limited | Real estate | 2025 |
| New Impression of China Cultural Communication (UK) Limited | Wholesale & retail | 2018 |
| New Products 4 ME Ltd | Wholesale & retail | 2026 |
| New Season Transformations Ltd | Administrative & support | 2026 |
| Newai Intelligence Ltd | Professional & scientific | 2026 |
| Newco UK Properties Ltd | Households | 2017 |