| NOW Think Limited | Professional & scientific | 2011 |
| Nowell & Richards Insurance Services Limited | Financial services | 1999 |
| Nowell Forecourts Limited | Wholesale & retail | 2014 |
| Nowell Investments Limited | Real estate | 2017 |
| Nowell Limited | Wholesale & retail | 2014 |
| Nowell Properties Limited | Real estate | 2014 |
| Nowroz Store Ltd | Wholesale & retail | 2025 |
| Nowt BUT Clean Ltd | Administrative & support | 2025 |
| Noxcentra Limited | Information & communication | 2026 |
| NP (Leeds) Limited | Financial services | 2025 |
| NP Brickwork & Building Ltd | Construction | 2014 |
| NP Group International Ltd | Information & communication | 2022 |
| NPB Bruno Services Ltd | Administrative & support | 2012 |
| Npbb Management Ltd | Professional & scientific | 2024 |
| NPP Build Ltd | Construction | 2020 |
| NPP Developments Ltd | Construction | 2016 |
| NPP Group Limited | Real estate | 2016 |
| NPP Homes Limited | Real estate | 2019 |
| NPQ Services Limited | Administrative & support | 2017 |
| NPS Cleaning Ltd | Administrative & support | 2023 |
| NPW Rentals Ltd | Real estate | 2024 |
| NR Leeds Ltd | Wholesale & retail | 2024 |
| NR Physio Ltd | Health & social care | 2022 |
| NRA 786 Consultancy Ltd | Professional & scientific | 2018 |
| Nram (NO.2) Limited | Extraterritorial | 1987 |
| Nram Limited | Financial services | 2015 |
| NRB Offshore Limited | Energy | 2024 |
| Nrbar Faith Limited | Health & social care | 2012 |
| NRC Lifestyle Ltd | Wholesale & retail | 2019 |
| NRD Realisations Ltd | Construction | 2020 |
| Nreh Ltd | Other services | 2021 |
| NRG Consulting Services Ltd | Information & communication | 2024 |
| Nrich Interior Design Limited | Professional & scientific | 2014 |
| Nrivesh Technologies Ltd | Information & communication | 2025 |
| Nrlawton Ltd | Health & social care | 2019 |
| NRM Digital Ltd | Professional & scientific | 2020 |
| Nrwconsults Ltd | Administrative & support | 2026 |
| NRY Property Ltd | Real estate | 2026 |
| NS Chauhan Music Limited | Information & communication | 2019 |
| NS Clinical Ltd | Health & social care | 2019 |
| NS Consultancy Services Ltd | Professional & scientific | 2021 |
| NS Finance Limited | Professional & scientific | 2019 |
| NS IT Ltd | Information & communication | 2024 |
| NS Management Services Ltd | Administrative & support | 2023 |
| NS Spark to Clean Limited | Households | 2021 |
| NS2WE Ltd | Real estate | 2023 |
| NSA Accountants Ltd | Professional & scientific | 2017 |
| Nscg Chemistry Limited | Administrative & support | 2023 |
| Nscg Diagnostics Limited | Administrative & support | 2000 |
| NSD Properties Ltd | Real estate | 2015 |
| Nsemmo Ltd | Real estate | 2019 |
| Nsert (UK) Limited | Wholesale & retail | 2012 |
| Nshare Ltd | Information & communication | 2009 |
| NSJ Projects Limited | Real estate | 2025 |
| NSK Pension Trustee Limited | Professional & scientific | 1988 |
| NSL Casemakers Limited | Manufacturing | 2016 |
| NSL Security Systems Ltd | Administrative & support | 2020 |
| NSM Music Group Limited | Professional & scientific | 2000 |
| NSM Music Limited | Manufacturing | 1967 |
| NSR Consulting Limited | Professional & scientific | 2013 |
| NSR Quality Management Services Ltd | Professional & scientific | 2015 |
| NSS Travel Ltd | Administrative & support | 2023 |
| Nssk Holdings Ltd | Financial services | 2023 |
| NT Accountancy & Consultancy Ltd | Professional & scientific | 2023 |
| NT Air Conditioning Ltd | Construction | 2026 |
| NT Editing Limited | Information & communication | 2008 |
| NT GAS & Heating Limited | Construction | 2017 |
| Ntal Limited | Wholesale & retail | 2021 |
| Ntar Ltd | Professional & scientific | 2022 |
| NTC Events Ltd | Hospitality | 2024 |
| NTG Engineering and Safety Solutions Ltd | Professional & scientific | 2009 |
| NTG Fulfilment Services Ltd | Manufacturing | 2026 |
| NTG Operations Ltd | Manufacturing | 2026 |
| NTH END Road Limited | Real estate | 2014 |
| NTH Group Ltd | Professional & scientific | 2018 |
| NTI Consulting Ltd | Professional & scientific | 2019 |
| Ntimotei Ltd | Transport & logistics | 2025 |
| Ntmotors Limited | Wholesale & retail | 2024 |
| NTR Consulting Ltd | Professional & scientific | 2017 |
| NTR Investments Limited | Real estate | 2013 |
| Ntulapa Ltd | Wholesale & retail | 2024 |
| Ntwosix Consulting Limited | Professional & scientific | 2025 |
| NTZ Consulting Limited | Administrative & support | 2016 |
| NTZ Properties Limited | Real estate | 2018 |
| NTZ Trading Ltd | Wholesale & retail | 2025 |
| NU Cuts Limited | Manufacturing | 2016 |
| NU Energy Group Limited | Professional & scientific | 2023 |
| NU Express Ltd | Wholesale & retail | 2024 |
| NU HQ Limited | Real estate | 2015 |
| NU IT Services Ltd | Information & communication | 2009 |
| NU Shooz Ltd | Information & communication | 2024 |
| NU Space Homes (Green Hammerton) Limited | Construction | 2020 |
| NU Vehicle Solutions Ltd | Wholesale & retail | 2016 |
| Nu-Heat (Holdings) Limited | Financial services | 2017 |
| Nu-Heat UK Limited | Wholesale & retail | 1995 |
| Nuad Hathavej Ltd | Health & social care | 2018 |
| Nuaire Limited | Manufacturing | 1966 |
| Nubreed Hotels Ltd | Administrative & support | 2019 |
| Nuclear (Holdings) Limited | Financial services | 2016 |
| Nuclear Decommissioning Limited | Construction | 2019 |