| Neat & Tidy Pro Cleaners Limited | Administrative & support | 2025 |
| Neatfit Ltd | Construction | 2016 |
| Nebula Construction Group Ltd | Construction | 2021 |
| Neca | Health & social care | 1984 |
| Neca Services Limited | Health & social care | 1997 |
| Neca Training Limited | Education | 2004 |
| Necessary Group Limited | Administrative & support | 2025 |
| Necfl C.I.C. | Arts & recreation | 2025 |
| Necommercialsolutions Limited | Real estate | 2025 |
| Necra C.I.C. | Public administration | 2024 |
| Nedicks Limited | Wholesale & retail | 2024 |
| Nedullions Limited | Professional & scientific | 2025 |
| Nedvita Limited | Wholesale & retail | 2025 |
| Need Solutions Ltd | Professional & scientific | 2011 |
| Needletail Ltd | Other services | 2025 |
| Neeta IC Ltd | Financial services | 2018 |
| Negombos UK Ltd | Wholesale & retail | 2024 |
| Neighbourhood Coffee Heaton Ltd | Hospitality | 2023 |
| Neighbourhood Energy Action Limited | Extraterritorial | 1995 |
| Neil GR LLP | | 2023 |
| Neil Herron Consultancy Limited | Professional & scientific | 2025 |
| Neil Housings Limited | Real estate | 2022 |
| Neil Jones Property Development Ltd | Construction | 2017 |
| Neil Wilson Design Ltd | Professional & scientific | 2019 |
| Neill Event Safety Services Ltd | Arts & recreation | 2021 |
| Nejad Services Ltd | Administrative & support | 2025 |
| Nejj Holdings Limited | Financial services | 2024 |
| Nekta Food & Juice Bar Ltd | Wholesale & retail | 2019 |
| NEL Technologies Limited | Manufacturing | 1984 |
| Nellalen Limited | Health & social care | 2014 |
| Nelly & Nova Limited | Wholesale & retail | 2021 |
| Nelson Construction (N/E) Limited | Construction | 2015 |
| Nelson Yard Limited | Real estate | 2013 |
| Nemro Properties Limited | Real estate | 2006 |
| Nemsk Sports Imaging LLP | | 2021 |
| NEO Automotive Ltd | Arts & recreation | 2025 |
| NEO Orthodontics North East Limited | Health & social care | 2018 |
| Neoark IT Ltd | Information & communication | 2024 |
| Neodata Ltd | Information & communication | 2023 |
| Neoffers.Co.Uk Ltd | Wholesale & retail | 2020 |
| Neon Law Limited | Extraterritorial | 2011 |
| Neon Legal Limited | Professional & scientific | 2010 |
| Neonrapid Limited | Wholesale & retail | 2024 |
| Nepc 2023 Ltd | Hospitality | 2023 |
| Nephos Limited | Real estate | 2024 |
| Nepi Incrementum (Eldon Street) Ltd | Administrative & support | 2022 |
| Nepi Incrementum (New Herrington) Ltd | Construction | 2023 |
| Nepi Incrementum Ltd | Construction | 2022 |
| Nepi M&Co NO 1 Limited | Real estate | 2018 |
| Nepi MK Limited | Real estate | 2018 |
| Nepi Scarm Limited | Real estate | 2018 |
| Nepm Ltd | Real estate | 2020 |
| Nepro Ltd | Real estate | 2026 |
| Nept NE Ltd | Arts & recreation | 2020 |
| Neptune Financial Systems Limited | Administrative & support | 2019 |
| Neptune Inspection Services Ltd | Mining & quarrying | 2013 |
| Neptune North Limited | Information & communication | 2024 |
| Nerd Cubed Limited | Arts & recreation | 2012 |
| Nerds Cooking Limited | Information & communication | 2023 |
| Nerdz & Alphaz Ltd | Wholesale & retail | 2025 |
| Nerja Owners Association Limited | Other services | 1989 |
| Nerone 1927 Limited | Hospitality | 2019 |
| Nerve Labs Ltd | Information & communication | 2025 |
| Nescit Cedere Limited | Other services | 2023 |
| Nese Financial Limited | Financial services | 2022 |
| Nesitebuild Limited | Construction | 2023 |
| Nest Steps Ltd | Information & communication | 2025 |
| Nestnurturegroup Ltd | Health & social care | 2024 |
| NET Fusion Limited | Wholesale & retail | 2020 |
| NET Zero Consulting North East Limited | Construction | 2019 |
| NET Zero Management Ltd | Professional & scientific | 2021 |
| NET Zero Technologies NE Limited | Energy | 2022 |
| Netchain Auto Ltd | Information & communication | 2026 |
| Netherton Park Stables Limited | Agriculture & fishing | 2002 |
| Netlink Trading Limited | Information & communication | 1999 |
| Netolia Ltd | Information & communication | 2024 |
| Netpresto Limited | Information & communication | 1998 |
| Netra Global Ltd | Wholesale & retail | 2025 |
| Netsaveit Ltd | Wholesale & retail | 2021 |
| Netsells Limited | Information & communication | 2012 |
| Netsoftuk Solution Ltd | Construction | 2019 |
| Netsol Limited | Information & communication | 2018 |
| Network Artists Ltd | Arts & recreation | 2006 |
| Network Ticketing Limited | Transport & logistics | 1987 |
| Networkbeat Limited | Professional & scientific | 1998 |
| Netwurk Group Ltd | Information & communication | 2020 |
| Neuchatel Designs Limited | Arts & recreation | 2025 |
| Neudio Ltd | Information & communication | 2025 |
| Neuro Specialists Consultation Ltd | Health & social care | 2023 |
| Neuro Specialists Limited | Extraterritorial | 2016 |
| Neuro Tide Limited | Professional & scientific | 2023 |
| Neuro-Cybernetics Ltd | Professional & scientific | 2019 |
| Neuroats Ltd | Manufacturing | 2026 |
| Neurohealth & System Advisory Ltd | Professional & scientific | 2026 |
| Neuronest Psychology Ltd | Health & social care | 2025 |
| Neurorad Consultation Limited | Health & social care | 2016 |
| Neuroscience Research Consultancy Ltd | Professional & scientific | 2023 |
| Neurospectrum Property Services Limited | Real estate | 2024 |
| Neurotech Innovation Ltd | Extraterritorial | 2020 |
| Neurotech Solutions Limited | Extraterritorial | 2020 |