| Nagras Properties Limited | Households | 2024 |
| NAJ & Van Services Ltd | Water & waste | 2020 |
| NAL Construction Limited | Real estate | 1995 |
| NAL Plant Limited | Construction | 1984 |
| NAM Computer Consulting Limited | Information & communication | 2001 |
| Namakkal Subramaniyam Limited | Wholesale & retail | 2019 |
| Namaste Nepal Limited | Hospitality | 2025 |
| Nana's Natural Doggy Treats Ltd | Wholesale & retail | 2022 |
| Nankivell's (Sheffield) Limited | Manufacturing | 1994 |
| Nankivells Fitted Furniture Limited | Manufacturing | 2013 |
| Nanzan Properties Limited | Real estate | 2026 |
| Napier Plumbing & Heating Ltd | Professional & scientific | 2015 |
| Napton Catering Limited | Hospitality | 2014 |
| Nascent Blockchain Ltd | Information & communication | 2020 |
| Natbourne Limited | Hospitality | 2025 |
| Nathan Birch Transportation Ltd | Transport & logistics | 2022 |
| National Hereditary Breast Cancer Helpline | Wholesale & retail | 2011 |
| National Signs Limited | Manufacturing | 2003 |
| National Smokeless Fuels Limited | Professional & scientific | 1973 |
| Nationwide Boat Surveys Ltd | Manufacturing | 2021 |
| Nationwide Builders Merchants Limited | Construction | 2009 |
| Nationwide Graffiti Removal Limited | Extraterritorial | 2022 |
| Nationwide Hygiene Supplies Limited | Wholesale & retail | 1986 |
| Nationwide Roof Cleaning Limited | Construction | 2025 |
| Nativus Ltd | Extraterritorial | 2022 |
| Natural Born Media Ltd | Information & communication | 2012 |
| Natural British Limited | Manufacturing | 2017 |
| Navigation Yard Residences Limited | Real estate | 2026 |
| NAW Automotive Ltd | Wholesale & retail | 2024 |
| Naylor & Slater Property Development Ltd | Construction | 2016 |
| Naylors Airport Transfers Limited | Transport & logistics | 2022 |
| Naylors Transport Group Limited | Transport & logistics | 2009 |
| NAZ & Sons (Chesterfield) Ltd | Transport & logistics | 2025 |
| NC & DR Property Developments Limited | Hospitality | 2010 |
| NC Immigration Services Ltd | Professional & scientific | 2024 |
| NCA Developments Limited | Construction | 2023 |
| NCH 206 Limited | Hospitality | 2023 |
| NCS Investments Ltd | Transport & logistics | 2024 |
| NDS Ultrasound Ltd | Health & social care | 2024 |
| NE Inspection Services Ltd | Professional & scientific | 2022 |
| Neavo Ltd | Information & communication | 2012 |
| Nebula Plumbing and Heating Ltd | Construction | 2024 |
| Nectarous Ltd | Wholesale & retail | 2024 |
| Needham Healthcare Ltd | Health & social care | 2024 |
| Needham Holdings Ltd | Financial services | 2023 |
| Needham Specialised Machines Limited | Manufacturing | 1990 |
| Needhams Refrigeration Ltd | Manufacturing | 2012 |
| Neil Smith Welding & Fabrications Limited | Manufacturing | 2020 |
| Neilson Holdings (UK) Limited | Real estate | 2006 |
| Nelca Limited | Public administration | 2024 |
| Nell+Lola Ltd | Wholesale & retail | 2011 |
| Nelster Estates Ltd | Real estate | 2019 |
| NEO TEC UPS Ltd | Information & communication | 2025 |
| NEO Tropic Telecom Ltd | Wholesale & retail | 2024 |
| Neodyne UK Limited | Professional & scientific | 2022 |
| Neppy Limited | Hospitality | 2025 |
| NER Holdings Ltd | Real estate | 2025 |
| Nest 36 Limited | Construction | 2021 |
| Netcoms.Co.Uk (Holdings) Ltd | Information & communication | 2014 |
| Netherleigh Court Management Limited | Real estate | 2001 |
| Nethu Management Ltd | Wholesale & retail | 2013 |
| Nethu Retail Ltd | Wholesale & retail | 2018 |
| Netscene Limited | Other services | 2003 |
| Network Direct Logistics Limited | Real estate | 2003 |
| Network King Limited | Arts & recreation | 2018 |
| Neville Swift Limited | Wholesale & retail | 2020 |
| New Africa Food Company Limited | Wholesale & retail | 2018 |
| New Albany Consulting Ltd | Professional & scientific | 2024 |
| New Beginnings Training Ltd | Education | 2025 |
| New Chatsworth Car Wash Ltd | Administrative & support | 2026 |
| New City 50 Ltd | Hospitality | 2026 |
| New Day Leisure Ltd | Wholesale & retail | 2019 |
| New Direction Inclusive Education Limited | Education | 2008 |
| New Directions Flexible Social Care Solutions (Home Counties) Limited | Health & social care | 2021 |
| New Directions Flexible Social Care Solutions Ltd | Health & social care | 2010 |
| New Door AV Ltd | Real estate | 2024 |
| New Level Accounting Ltd | Professional & scientific | 2025 |
| New LFC Chesterfield Ltd | Hospitality | 2019 |
| New Oak Estates Limited | Real estate | 2016 |
| New Perceptions Training Ltd | Administrative & support | 2026 |
| New Square Properties Limited | Real estate | 1960 |
| New VA KEI Limited | Hospitality | 2026 |
| New Waahoo Limited | Hospitality | 2015 |
| New Waste Solutions Ltd | Water & waste | 2019 |
| New-Food Innovation Ltd | Professional & scientific | 2011 |
| Newberry Property Ltd | Real estate | 2026 |
| Newbold Bedrooms Limited | Wholesale & retail | 2015 |
| Newbold Food Ltd | Hospitality | 2024 |
| Newbold MOT Centre Limited | Wholesale & retail | 2003 |
| Newbold Render Specialist Ltd | Construction | 2022 |
| Newbold Tecnik Ltd | Professional & scientific | 2021 |
| Newbold Valeting Ltd | Wholesale & retail | 2019 |
| Newcastle Business Park Developments | | 1989 |
| Newcoe Limited | Wholesale & retail | 2016 |
| Newcou Limited | Wholesale & retail | 2016 |
| Newland Developments Ltd | Construction | 2014 |
| Newman Property Investments Ltd | Real estate | 2015 |
| Newpro Developments Ltd | Real estate | 2023 |
| Newton Allan Ltd | Other services | 2009 |
| Newton Castings Ltd | Manufacturing | 2023 |