| Next Chapter Animal Rescue CIC | Professional & scientific | 2024 |
| Next Level Electrics Limited | Construction | 2021 |
| Nextline Partners Ltd | Professional & scientific | 2026 |
| Nexus Estate Agents Ltd | Real estate | 2023 |
| Nexus Solution Groundworks Ltd | Construction | 2026 |
| Nexusprovide Limited | Wholesale & retail | 2024 |
| NFW Accounting Services Limited | Professional & scientific | 2005 |
| NGS Media Ltd | Information & communication | 2024 |
| Nhae Limited | Professional & scientific | 2013 |
| Nhpb Limited | Professional & scientific | 2016 |
| Niche Lodgings Ltd | Real estate | 2016 |
| Nicholas LE GAL Limited | Professional & scientific | 2024 |
| Nicholas Wooff Limited | Construction | 2017 |
| Nick Lynch Consulting Limited | Professional & scientific | 2019 |
| Nicu Albu Ltd | Transport & logistics | 2021 |
| Nigel Wilson Associates Ltd | Professional & scientific | 2003 |
| Night Sky Health Ltd | Professional & scientific | 2021 |
| Nijjar Dairies Limited | Wholesale & retail | 1993 |
| Nijjar Family Limited | Professional & scientific | 2016 |
| Nijjar Group Freshway Holdings Limited | Professional & scientific | 2021 |
| Nijjar Group Holdings (Acton) Limited | Professional & scientific | 2010 |
| Nijjar Holdings Limited | Professional & scientific | 1995 |
| Nijjar Property Limited | Manufacturing | 1995 |
| NIK Design Ltd | Professional & scientific | 2010 |
| Niket Ltd | Wholesale & retail | 2025 |
| Nikov Motion Ltd | Wholesale & retail | 2025 |
| Nimontron Indian Restaurant Ltd | Hospitality | 2019 |
| Nirgun Limited | Hospitality | 2019 |
| NJ Burch Limited | Professional & scientific | 2016 |
| NJD Associates UK Ltd | Professional & scientific | 2019 |
| Njsolutions.Co.Uk Ltd. | Information & communication | 2006 |
| NKI Medsec Services Ltd | Administrative & support | 2024 |
| Nmmcs Limited | Professional & scientific | 2016 |
| Nmxix Ltd | Financial services | 2023 |
| NO 27 Station Road Management Company Limited | Households | 2013 |
| NO Limits Gym Ltd | Arts & recreation | 2022 |
| NO Ordinary Salon Ltd | Other services | 2019 |
| Noble Sports Management Ltd | Professional & scientific | 2021 |
| Noela Ltd | Wholesale & retail | 2025 |
| Noise Monkey Limited | Information & communication | 2017 |
| Nojux Ltd | Manufacturing | 2019 |
| Nona Solutions Limited | Construction | 2020 |
| Nook Coffee Ltd | Hospitality | 2015 |
| Noor Al-Mustaqbal Ltd | Real estate | 2024 |
| Noor Fashionware Limited | Wholesale & retail | 2015 |
| Noor Sanctuary Limited | Health & social care | 2015 |
| Norbros Property Limited | Construction | 2016 |
| Norbros Solutions Limited | Construction | 2025 |
| Norris Property Holdings Limited | Real estate | 2001 |
| Nortex Consult Limited | Information & communication | 2022 |
| North Camp Enduro MCC Ltd | Arts & recreation | 2024 |
| North Farm Developments Ltd | Construction | 2025 |
| North Lincolnshire Motor Company Limited | Real estate | 1987 |
| North Modding Studios Limited | Arts & recreation | 2017 |
| North SP Group Limited | Financial services | 2017 |
| North Star Holdings Ltd | Real estate | 2025 |
| North Strategies Limited | Information & communication | 2017 |
| Northbank Print Management Limited | Professional & scientific | 2015 |
| Northbrook Energy Advisory Limited | Professional & scientific | 2016 |
| Northcote Mansions Limited | Households | 2003 |
| Northern Estate Agencies Limited | Real estate | 1990 |
| Northfield Estates Limited | Professional & scientific | 1998 |
| Northfields Estates Limited | Other services | 1989 |
| Northfields Holdings Limited | Extraterritorial | 2019 |
| Northlake Partners Ltd | Education | 2017 |
| Northlake Services Ltd | Professional & scientific | 2026 |
| Northway Lodge Ltd | Health & social care | 2025 |
| Norwegian Wood Residents Association Limited | Households | 2011 |
| NOT Just Digital 101 Limited | Professional & scientific | 2019 |
| NOT SO Naughty Limited | Manufacturing | 2026 |
| Nova Talent Solutions Ltd | Administrative & support | 2024 |
| Noveltech Labs Ltd | Manufacturing | 2023 |
| Novo Tech Solutions Ltd | Professional & scientific | 2023 |
| Npvcleaners Limited | Administrative & support | 2025 |
| NRG Creative Projects Ltd | Administrative & support | 2020 |
| Nrmodgil Limited | Real estate | 2017 |
| NSG Delivery Limited | Transport & logistics | 2024 |
| NSS Plus Ltd | Manufacturing | 2018 |
| NTQ Worldwide Limited | Wholesale & retail | 2023 |
| Ntree Holdings Limited | Financial services | 2025 |
| Ntree Technology Limited | Information & communication | 2020 |
| Nucast Limited | | 1984 |
| Nuco Limited | Energy | 1994 |
| Nudge Accounting Limited | Financial services | 2016 |
| Nuges Ltd | Information & communication | 2017 |
| Numatic International Limited | Manufacturing | 1963 |
| Number 1 Honey END Lane Limited | Households | 2019 |
| Nuralife Ltd | Public administration | 2026 |
| Nureon Engineering Limited | Professional & scientific | 2026 |
| Nurses Today Limited | Administrative & support | 2022 |
| Nurture & Equip Ltd | Education | 2026 |
| Nurturenest Home Care Limited | Health & social care | 2024 |
| Nutriment Ltd | Manufacturing | 2013 |
| Nxgen Sports Partners Ltd | Other services | 2025 |
| NXT GEN Sports Group Ltd | Arts & recreation | 2024 |
| Nxtgen Developments Ltd | Real estate | 2022 |
| Nxtgen Finance Ltd | Financial services | 2026 |
| Nxtgen Real Estate Limited | Real estate | 2023 |
| O Maxim Haulage Ltd | Transport & logistics | 2018 |
| O&E 1618 Ltd | Hospitality | 2018 |