| Nightflix Drive-In Cinema Ltd | Information & communication | 2020 |
| Nightingale Admin Ltd | Administrative & support | 2021 |
| Nightingale Homes (Gillingham) Ltd | Real estate | 1992 |
| Nightingale Homes (Upchurch) Ltd | Real estate | 2008 |
| Nikita by Niki Limited | Wholesale & retail | 2016 |
| Nikos Group Ltd | Wholesale & retail | 2025 |
| Nine Acres Asset Management Consultancy Limited | Professional & scientific | 2022 |
| NINE10 Property Investments Ltd | Real estate | 2025 |
| Nippd Ltd | Other services | 2024 |
| Nisbets Trading Co Ltd | Wholesale & retail | 2026 |
| Nittya Energy Limited | Wholesale & retail | 2025 |
| NJM London Clothing Ltd | Wholesale & retail | 2024 |
| Njmannie Welding and Fabrication Ltd | Manufacturing | 2019 |
| NK Accounting and Related Services Ltd | Professional & scientific | 2024 |
| NK Construction Group Ltd | Construction | 2026 |
| Nkemjika Ltd | Health & social care | 2021 |
| Nkrv Limited | Information & communication | 2026 |
| Nktrans Ltd | Transport & logistics | 2025 |
| NMB Training Ltd | Professional & scientific | 2022 |
| NMP Medical Services Ltd | Health & social care | 2024 |
| NN Digi COM Ltd | Wholesale & retail | 2024 |
| Nnewiuk Properties Ltd | Real estate | 2024 |
| NO Average JOE Limited | Administrative & support | 2025 |
| NO BAD Days Limited | Other services | 2021 |
| NO Pain Numb Ltd | Wholesale & retail | 2024 |
| NO.1 WOK Limited | Hospitality | 2024 |
| NO.84 Limited | Hospitality | 2023 |
| NO.84 Mobile Limited | Hospitality | 2025 |
| Noah and Theo Ltd | Wholesale & retail | 2020 |
| Noah’S ARK Nursery & PRE School Ltd | Education | 2021 |
| Nobelt Global Ltd | Administrative & support | 2020 |
| Noble Flip Property Limited | Real estate | 2026 |
| Noble Medics Ltd | Health & social care | 2013 |
| Nodus AI Ltd | Professional & scientific | 2026 |
| Noelthy Care and Support Services Limited | Health & social care | 2025 |
| Noelthy Consult Services Limited | Information & communication | 2024 |
| Noelthy Estates and Design Limited | Real estate | 2022 |
| Nokuthula Limited | Professional & scientific | 2015 |
| NON Mech Plant Co Ltd | Construction | 2016 |
| Noor Emporium Ltd | Wholesale & retail | 2024 |
| Norbert Pepel Fitness Limited | Other services | 2026 |
| Nordiko Ltd | Wholesale & retail | 2024 |
| North Kent Independent Advocacy Scheme | Health & social care | 2005 |
| Northdowners Nurseries Limited | Agriculture & fishing | 2010 |
| Northern Excellence Ltd | Administrative & support | 2025 |
| Northfleet Electrical Limited | Construction | 2012 |
| Northfleet Support Services Ltd | Other services | 2013 |
| Northreed RTM Company Limited | Households | 2017 |
| Norths Garden Maintenance Ltd | Financial services | 2025 |
| Northwest Consulting Ltd | Professional & scientific | 2022 |
| Northwickbro Ltd | Wholesale & retail | 2026 |
| Norton Design & Build Ltd | Construction | 2025 |
| Nostalgic Designs Limited | Real estate | 2005 |
| NOT Just ANY Doctor Ltd | Education | 2025 |
| NOT Just Flowers Ltd | Wholesale & retail | 2018 |
| Nouveauidea Ltd | Professional & scientific | 2024 |
| Nova J Trade Ltd | Wholesale & retail | 2025 |
| Novara Orbital Dynamics Limited | Manufacturing | 2025 |
| Novha Properties Ltd | Real estate | 2025 |
| Novia Holdings Limited | Professional & scientific | 1990 |
| Novia Limited | Wholesale & retail | 1996 |
| Novus Capital Group Ltd | Financial services | 2026 |
| Novus Industrial Services Ltd | Construction | 2024 |
| Noyes Property Holdings LLP | | 2019 |
| NPE Services Ltd | Manufacturing | 2021 |
| Nrdl (NOW Retail Design) Ltd | Manufacturing | 2018 |
| NRG UK Holdings Limited | Professional & scientific | 2020 |
| Nrnilievi Ltd | Transport & logistics | 2019 |
| Nrpsi | Other services | 2011 |
| NSG Services Limited | Financial services | 2023 |
| NSS Global Ltd | Other services | 2017 |
| Ntaa Ltd | Construction | 2024 |
| Ntlc Scaffolding Ltd | Construction | 2024 |
| Nubianshe (Support, Heal & Empower) International CIC | Administrative & support | 2025 |
| Number 45 Holdings Limited | Financial services | 2018 |
| Number 5 Dalby Square Management Limited | Real estate | 2024 |
| Number 54 Holdings Limited | Financial services | 2018 |
| Number 714 Limited | Financial services | 2018 |
| Nunes IT Services Ltd | Information & communication | 2015 |
| Nurstead Court Holdings Limited | Professional & scientific | 2021 |
| Nurstead Court Limited | Hospitality | 2002 |
| Nurture Associates Limited | Other services | 2024 |
| Nutrisi Limited | Manufacturing | 2019 |
| Nuttyme Limited | Manufacturing | 2024 |
| Nxdrive Limited | Wholesale & retail | 2023 |
| Nybk Limited | Wholesale & retail | 2020 |
| O M Scaffolding Ltd | Construction | 2024 |
| O&F Construction Ltd | Construction | 2026 |
| O'Brien Access Solutions Ltd | Construction | 2018 |
| O'Connors Engineering Limited | Administrative & support | 2014 |
| O'Hara Recycling Ltd | Construction | 2026 |
| O.M.G. 3D Print Ltd | Manufacturing | 2025 |
| OA Tutors Ltd | Education | 2025 |
| OAI Contracts Ltd | Construction | 2023 |
| Oak & Sherman Limited | Professional & scientific | 2017 |
| Oakbrook Limited | Professional & scientific | 2015 |
| Oakleigh Farms Limited | Agriculture & fishing | 1997 |
| Oakleigh Grove Investments Limited | Financial services | 2022 |
| Oakleigh Nurseries Ltd | Agriculture & fishing | 2025 |
| Oakley Day Nursery Limited | Health & social care | 2014 |