| Naylor Software Services Limited | Information & communication | 2019 |
| NAZ Catering Limited | Hospitality | 2013 |
| Nazaqat Properties Ltd | Real estate | 2025 |
| NB Agri Ltd | Agriculture & fishing | 2020 |
| NB Ecom Ltd | Wholesale & retail | 2023 |
| NBG Groundworks Limited | Construction | 2024 |
| NBT UK Holdings Limited | Financial services | 2024 |
| NCA Associates Ltd | Professional & scientific | 2014 |
| Ncdt Limited | Hospitality | 2025 |
| Ncia Holdings Limited | Health & social care | 2017 |
| NCM Asset Management Limited | Real estate | 2016 |
| NCM Property Limited | Real estate | 2020 |
| NCR Building & Joinery Limited | Construction | 2025 |
| NCV Logistic Ltd | Transport & logistics | 2016 |
| NDH Labs Ltd | Professional & scientific | 2018 |
| Ndtec Limited | Information & communication | 2003 |
| Neat & Complete Maintenance Ltd | Construction | 2025 |
| Nebco Ltd | Wholesale & retail | 2020 |
| Nebig Packaging UK Limited | Administrative & support | 2018 |
| Nebula Wave Dynamics Ltd | Extraterritorial | 2025 |
| Nedaplast Ltd | Administrative & support | 2007 |
| Nedbe Partnership Ltd | Professional & scientific | 2025 |
| Need a Hand Ltd | Construction | 2003 |
| Need More Clicks Ltd | Information & communication | 2019 |
| Needham & Sons Limited | Professional & scientific | 2012 |
| Neepsend Pallets Limited | Manufacturing | 2010 |
| Neesh Trading Limited | Wholesale & retail | 2025 |
| Neil Boardman Windows Ltd | Construction | 2026 |
| Neil Clegg Transport Limited | Transport & logistics | 2009 |
| Neil Day Plumbing and Heating Limited | Construction | 2013 |
| Neil Gaskin Post Press Solutions Ltd | Other services | 2020 |
| Neil Peart Security Consultant and Project Management Ltd | Administrative & support | 2008 |
| Neil Riley Consulting Ltd | Administrative & support | 2016 |
| Neil Thompson Accounts Ltd | Professional & scientific | 2021 |
| Nekosoft Ltd | Information & communication | 2024 |
| NEL Transport Limited | Administrative & support | 2019 |
| Nemark Holdings Ltd | Financial services | 2023 |
| Nemark Professional IT Services Limited | Information & communication | 2008 |
| Nemark Properties Ltd | Real estate | 2023 |
| Nemazy Care Ltd | Health & social care | 2022 |
| Nemazy Ltd | Administrative & support | 2011 |
| Nemrut Pizza Limited | Hospitality | 2023 |
| Nenita Consult Ltd | Wholesale & retail | 2024 |
| Neolya Ltd | Information & communication | 2025 |
| Neotrez Limited | Professional & scientific | 2023 |
| Neovanta Ltd | Professional & scientific | 2025 |
| Neovara Industries Ltd | Extraterritorial | 2026 |
| Neovent Ltd | Wholesale & retail | 2025 |
| Nepalaye House Limited | Real estate | 2021 |
| Nephele Bags Limited | Wholesale & retail | 2021 |
| Neptune IT Solutions Ltd | Wholesale & retail | 2025 |
| Nero Architectural Coating Limited | Construction | 2023 |
| Nero Wraps Ltd | Wholesale & retail | 2025 |
| Nervana Limited | Financial services | 2025 |
| NES (Testing) Limited | Professional & scientific | 2002 |
| NES Pizza Limited | Hospitality | 2025 |
| Ness Bistro & Bars Ltd | Hospitality | 2024 |
| Nestkey Properties Ltd | Hospitality | 2022 |
| Nestlings & Co. Childcare Ltd | Health & social care | 2025 |
| NET Zero Developments Limited | Energy | 2025 |
| Netcloud Ltd | Information & communication | 2005 |
| Netcom Security Ltd | Administrative & support | 2023 |
| Netherhall Road Properties Limited | Real estate | 2003 |
| Nethermoor Group Limited | Administrative & support | 2022 |
| Netherthorpe GAS Services Limited | Energy | 2021 |
| Netherthorpe Properties Limited | Real estate | 2026 |
| Netko Limited | Hospitality | 2026 |
| Netpaz Ltd | Extraterritorial | 2025 |
| Nettle Transport Ltd | Transport & logistics | 2014 |
| Network Direct Doncaster Limited | Wholesale & retail | 2004 |
| Network Systems Group Limited | Manufacturing | 1999 |
| Neural Axon Ltd | Information & communication | 2022 |
| Neural Plasticity Ltd | Education | 2025 |
| Neuron Centre Limited | Real estate | 2012 |
| Neuronaute Ltd | Information & communication | 2025 |
| Never Ever Limited | Professional & scientific | 2007 |
| Never Presume ITS Limited | Professional & scientific | 2012 |
| Neve’S Gaff Ltd | Hospitality | 2026 |
| New Adventures (Doncaster) Limited | Education | 2015 |
| New Beginnings Care Ltd | Health & social care | 2024 |
| New Beni Ltd | Hospitality | 2025 |
| New China Palace Catering Limited | Hospitality | 2023 |
| New Curry House Takeaway Limited | Hospitality | 2018 |
| New Dawn Plumbing and Heating Limited | Construction | 2021 |
| New Horizons SY CIC | Health & social care | 2026 |
| New Link Productions Limited | Information & communication | 2021 |
| New Ocean Dynasty Limited | Hospitality | 2025 |
| New Options Engineering and Training Ltd | Construction | 2010 |
| New Rise Developments Ltd | Construction | 2019 |
| New Seasons Limited | Information & communication | 2024 |
| New Shipping Containers Ltd | Transport & logistics | 2025 |
| New Springfield Care Ltd | Health & social care | 2023 |
| New Station Motor Company Limited | Wholesale & retail | 2021 |
| New Van Leasing Ltd | Wholesale & retail | 2019 |
| New Victoria Care Ltd | Health & social care | 2023 |
| New Vision Education | Education | 2022 |
| New Vision Windows Limited | Manufacturing | 2019 |
| New Wakefield Sushi Limited | Hospitality | 2024 |
| New World Support Services Ltd | Health & social care | 2018 |
| New York Nails Anthony Tran Limited | Other services | 2018 |