| Nature Sign Design Limited | Professional & scientific | 2007 |
| Naughton Toolan LLP | | 2026 |
| Navari Infrastructure Limited | Professional & scientific | 2020 |
| Navari Networks Limited | Information & communication | 2020 |
| Navari Online Limited | Financial services | 2020 |
| NB Quality & Construction Limited | Professional & scientific | 2025 |
| Nbg-B Acquisition UK Limited | Financial services | 2021 |
| Nbg-B Holding UK Limited | Financial services | 2021 |
| Nbg-B Intermediate UK Limited | Financial services | 2021 |
| Nbg-B UK Limited | Financial services | 2021 |
| NBM Resources Limited | Construction | 2021 |
| NC Consulting Services Ltd | Professional & scientific | 2025 |
| NCP II GP LLP | | 2024 |
| ND Mind Limited | Health & social care | 2020 |
| NDD Medical and Care Limited | Other services | 2016 |
| NDE Limited | Administrative & support | 2018 |
| NE Innovations Limited | Information & communication | 2013 |
| NE Investments Limited | Professional & scientific | 2007 |
| Nealle Page Limited | Professional & scientific | 2025 |
| Neapolis Properties Limited | Professional & scientific | 2006 |
| Neat Dynamics Limited | Information & communication | 2016 |
| Neat Ventures Limited | Information & communication | 2024 |
| NED Civil Engineering Limited | Construction | 2015 |
| Needen Holdings Ltd | Real estate | 2020 |
| Needenergy Limited | Energy | 2024 |
| Needham Hall Freehold Limited | Households | 2011 |
| Needham Hall Management Company Limited | Households | 2008 |
| Needitnow Limited | Wholesale & retail | 2025 |
| NEG Aviation Ltd | Manufacturing | 2021 |
| Neighbourhood Collab Limited | Wholesale & retail | 2023 |
| Neighbourhood Investments Ltd | Construction | 2023 |
| Neighbourhood Lettings Limited | Real estate | 2021 |
| Neighbourhood Touring Ltd | Administrative & support | 2024 |
| Neighbourly.Work Limited | Information & communication | 2026 |
| Neil Barrett Photography Limited | Professional & scientific | 2003 |
| Neil Black Limited | Professional & scientific | 2023 |
| Neil Hall Associates Limited | Professional & scientific | 2026 |
| Neil Harris Coaching & Consultancy Ltd | Professional & scientific | 2025 |
| Neil Redfern Photography Limited | Professional & scientific | 2013 |
| Neima Property Ltd | Real estate | 2024 |
| Neish Clothing Limited | Administrative & support | 2016 |
| Nelnet UK Holdings Limited | Financial services | 2026 |
| Nelson Project Management Limited | Professional & scientific | 2013 |
| Nemesis Property Ltd | Administrative & support | 2017 |
| Nemo Property Group Ltd | Real estate | 2023 |
| Nenog Integrated Resources Limited | Wholesale & retail | 2024 |
| NEO Consultancy Services Limited | Professional & scientific | 2025 |
| NEO Integration Limited | Professional & scientific | 2021 |
| Neom Ltd. | Manufacturing | 2004 |
| Neom Retail 1 Limited | Wholesale & retail | 2014 |
| Neophore Limited | Professional & scientific | 2017 |
| Neptune Limited | Professional & scientific | 2017 |
| Nerdwallet Ltd | Professional & scientific | 2005 |
| Nerdwallet UK Limited | Information & communication | 2020 |
| Nerve AI Limited | Information & communication | 2026 |
| NES Advantage Limited | Administrative & support | 2004 |
| NES Finance Limited | Administrative & support | 2006 |
| NES Fircroft Engineering Services Limited | Administrative & support | 1997 |
| NES Fircroft Limited | Financial services | 2020 |
| NES Fircroft Midco Limited | Financial services | 2020 |
| NES Fircroft Technical Services Limited | Administrative & support | 1995 |
| NES Global Limited | Administrative & support | 1992 |
| NES Global Talent Finance Limited | Financial services | 2012 |
| NES Global Talent Finco Limited | Administrative & support | 2013 |
| NES Global Talent Holdco Limited | Administrative & support | 2012 |
| NES Global Talent Holdings Ltd | Financial services | 2012 |
| NES Global Talent Limited | Financial services | 2012 |
| NES Group Limited | Financial services | 1998 |
| NES Halian Limited | Financial services | 2022 |
| NES Holdings Limited | Administrative & support | 2006 |
| NES International Limited | Administrative & support | 1984 |
| NES IT Limited | Administrative & support | 1983 |
| NES Managed Services Limited | Administrative & support | 2009 |
| NES Trustees Limited | Financial services | 1999 |
| NES UK Limited | Administrative & support | 1979 |
| Nesco Holdings Limited | Administrative & support | 1999 |
| Nesten Homes Limited | Construction | 2026 |
| Nesterwest Limited | Administrative & support | 2006 |
| Nesun Investments Limited | Construction | 2011 |
| NET Connection Limited | Information & communication | 2011 |
| Netchwood Finance Ltd | Financial services | 2009 |
| Netherlea Management Limited | Real estate | 2000 |
| Nethertech Limited | Professional & scientific | 2022 |
| Netmal Limited | Professional & scientific | 2024 |
| Netri & Fiore Clinic Ltd | Health & social care | 2019 |
| Nettleton Gate Limited | Real estate | 2001 |
| Network Vision Limited | Administrative & support | 2005 |
| Neubria Holdings Limited | Professional & scientific | 2019 |
| Neubria IP Limited | Financial services | 2020 |
| Neubria Limited | Wholesale & retail | 2017 |
| Neubria USA Limited | Wholesale & retail | 2019 |
| Neubria Worldwide Limited | Wholesale & retail | 2019 |
| Neural Technology Limited | Information & communication | 2013 |
| Neurio Products Ltd | Hospitality | 2019 |
| Neuro First Limited | Professional & scientific | 2025 |
| Neurocrine UK Limited | Professional & scientific | 2022 |
| Neurolaboratories Limited | Information & communication | 2018 |
| Neuroland Limited | Administrative & support | 2016 |
| Neurologic Clinical Services Ltd | Health & social care | 2024 |
| Neurosci Ltd | Professional & scientific | 2009 |