| Nouize Ltd | Wholesale & retail | 2025 |
| Nouriens Ltd | Wholesale & retail | 2021 |
| Nourish With Fadumo Ltd | Health & social care | 2026 |
| Nourriturebespoke Ltd | Manufacturing | 2023 |
| Nous Analytics Ltd | Information & communication | 2026 |
| Nova - Northern Star CIC | Administrative & support | 2023 |
| Nova Advisors Limited | Professional & scientific | 2024 |
| Nova Care Staffing & Recruitment Limited | Health & social care | 2023 |
| Nova Champs Ltd | Extraterritorial | 2024 |
| Nova Electrical and Mechanical Ltd | Construction | 2024 |
| Nova J Pubs Ltd | Hospitality | 2026 |
| Nova Phoenix Studios Ltd | Information & communication | 2022 |
| Nova Satus 611 Ltd | Professional & scientific | 2017 |
| Nova Scientia Limited | Professional & scientific | 2020 |
| Novamrc Ltd | Information & communication | 2025 |
| Novasecureinstallations Ltd | Administrative & support | 2025 |
| Novaweb International Ltd | Wholesale & retail | 2022 |
| Novawyn Limited | Wholesale & retail | 2025 |
| Novel Sheff Ltd | Wholesale & retail | 2023 |
| Novelli Group Limited | Professional & scientific | 2024 |
| Noveum Limited | Information & communication | 2017 |
| Novex Technology Co., Ltd | Wholesale & retail | 2025 |
| Novice UK Ltd | Professional & scientific | 2008 |
| Novisage Ltd | Information & communication | 2025 |
| Novo Coaching Limited | Professional & scientific | 2014 |
| Novotech NDT Ltd | Professional & scientific | 2018 |
| NOW Dutton Limited | Administrative & support | 2014 |
| NOW Health International (UK) Limited | Financial services | 2010 |
| Nowak Abodes Limited | Real estate | 2023 |
| Nowasell Ltd | Professional & scientific | 2024 |
| Nowthen Cleaners Ltd. | Administrative & support | 2015 |
| NOX Press Ltd | Manufacturing | 2026 |
| NP Fine Ltd | Wholesale & retail | 2025 |
| NPC North Limited | Administrative & support | 2017 |
| Npfs Consultancy Ltd | Education | 2014 |
| NPL Limited | Construction | 2015 |
| NPM Consultancy Limited | Health & social care | 2024 |
| Nprime Holdings Limited | Professional & scientific | 2017 |
| Nprime Limited | Professional & scientific | 2005 |
| Nprintz Limited | Manufacturing | 2018 |
| Nprt Limited | Wholesale & retail | 2006 |
| NR Railtech Ltd | Manufacturing | 2026 |
| NRC Cleaning Services Limited | Construction | 2011 |
| NRC Group Holdings Limited | Construction | 2021 |
| NRC Services Limited | Construction | 1996 |
| NRH Holdings Ltd | Manufacturing | 2024 |
| Nrsk Estates Ltd | Real estate | 2023 |
| NRW Financial Services Ltd | Financial services | 2012 |
| NS Medcare Ltd | Health & social care | 2025 |
| NS Property Development Limited | Real estate | 2016 |
| Nsbo Consulting Ltd | Real estate | 2024 |
| NSM Soundworks Ltd | Arts & recreation | 2026 |
| Nsrf Ltd | Construction | 2025 |
| Nstarc Ltd | Information & communication | 2021 |
| NSU Physiques Ltd | Education | 2025 |
| NT Compliance and Competency Monitoring Limited | Other services | 2014 |
| NT H&S Limited | Administrative & support | 2015 |
| NT Jose Ltd | Information & communication | 2014 |
| NT Legal Services Ltd | Professional & scientific | 2022 |
| NT Software Consultancy Ltd | Wholesale & retail | 2018 |
| NTA Glass Ltd | Construction | 2013 |
| Ntarenic Ltd | Administrative & support | 2020 |
| NTK Aesthetics Ltd | Other services | 2026 |
| NTM Construction Limited | Construction | 2006 |
| NTM Rail Ltd | Construction | 2015 |
| NTS Holdings Group Limited | Financial services | 2024 |
| Ntuyo Ltd | Construction | 2025 |
| NU Nutrition Limited | Health & social care | 2024 |
| Nu-Con Ready Mixed Concrete Limited | Manufacturing | 2003 |
| Nu-Life Windows and Conservatories (UK) Ltd | Wholesale & retail | 2002 |
| Nu:Yu Beauty Ltd | Wholesale & retail | 2024 |
| Nubase Ltd | Hospitality | 2023 |
| Nubificus Ltd | Professional & scientific | 2018 |
| Nuclei Properties Limited | Real estate | 2004 |
| Nucleus Point Ltd | Information & communication | 2023 |
| Nucron Ltd | Professional & scientific | 2016 |
| Nudgg App Ltd | Information & communication | 2025 |
| Nudigita Ltd | Information & communication | 2019 |
| NUE International GF Limited | Wholesale & retail | 2022 |
| Nueco Group Limited | Construction | 2019 |
| Nuevo Properties Limited | Real estate | 2025 |
| Nugal Developments Ltd | Administrative & support | 2020 |
| NUH Corporations Ltd | Health & social care | 2026 |
| Nulife Commercial Valeting Limited | Wholesale & retail | 2018 |
| Number 1 Pizza Ltd | Other services | 2023 |
| Number 92-SUPPLY Ltd | Other services | 2024 |
| Number Crunchers (Payroll) Limited | Extraterritorial | 2008 |
| Number Crunchers (Sheffield) Limited | Professional & scientific | 2003 |
| Number One S2 Limited | Other services | 2022 |
| NUMBER-1 Global Limited | Health & social care | 2022 |
| Numbers Sensitive Private Limited | Professional & scientific | 2016 |
| Numed Healthcare Limited | Health & social care | 2024 |
| Numed Holdings Limited | Health & social care | 1977 |
| Numed Investments Limited | Health & social care | 2013 |
| Numed Limited | Health & social care | 1983 |
| Numenor Payements Ltd | Health & social care | 2022 |
| Numeric Pulse Data Solutions Ltd | Information & communication | 2025 |
| Nuola Ltd | Wholesale & retail | 2017 |
| NUR Baby Ltd | Wholesale & retail | 2025 |
| Nura Consulting Ltd | Information & communication | 2026 |