| Nirvanic Ltd | Financial services | 2017 |
| Nirvau Ltd | Information & communication | 2020 |
| Nisa Fast Food Ltd | Hospitality | 2024 |
| Nishcam Consultancy Ltd | Professional & scientific | 2025 |
| Nishcam Properties Ltd | Real estate | 2024 |
| Nitor Plus Limited | Information & communication | 2017 |
| Nityaa Enterprises Ltd | Health & social care | 2009 |
| Nivaasa Stays Ltd | Real estate | 2025 |
| Nivnest Ltd | Manufacturing | 2023 |
| Niwinski Transport Limited | Construction | 2013 |
| Nizado Ltd | Information & communication | 2022 |
| Nizip Ltd | Administrative & support | 2017 |
| NJ & O Ltd | Wholesale & retail | 2026 |
| NJ Barber Property Holdings Limited | Real estate | 2020 |
| NJ Track Limited | Wholesale & retail | 2011 |
| NJD Consult Limited | Professional & scientific | 2021 |
| NJE Design Services Ltd | Professional & scientific | 2012 |
| Njong Enterprise Limited | Wholesale & retail | 2023 |
| NK & Co Ventures Limited | Financial services | 2025 |
| NK Funding Ltd | Financial services | 2024 |
| NKB & Associates U.K. Limited | Hospitality | 2013 |
| NKB Consultancy Ltd | Real estate | 2020 |
| NKN Motors Ltd | Wholesale & retail | 2025 |
| NLJ Investments Limited | Financial services | 2024 |
| NM Business Services Ltd | Administrative & support | 2025 |
| NM Trading & Services Ltd | Professional & scientific | 2021 |
| NMA Studio Ltd | Other services | 2025 |
| Nmcwatch:Registrant Care CIC | Public administration | 2020 |
| NMS Catering Limited | Hospitality | 2010 |
| NMT Crane Hire Limited | Administrative & support | 2001 |
| NN Plumbing & Heating Ltd | Construction | 2021 |
| NO 14 Ampthill Ltd | Wholesale & retail | 2022 |
| NO Junk Mail Ltd | Transport & logistics | 2011 |
| NO More Allen Keys Ltd | Other services | 2025 |
| NO Nonsense Technology Limited | Information & communication | 2012 |
| NO Sweat Properties Ltd | Administrative & support | 2024 |
| NO. 6 Planning Limited | Professional & scientific | 2025 |
| NO.1 Property Ltd | Real estate | 2018 |
| NO1 Estate Agents Ltd | Real estate | 2019 |
| Noble & Reading Hearcare Ltd | Wholesale & retail | 2021 |
| Noble Haven Homes Ltd | Real estate | 2025 |
| Noble Search Limited | Administrative & support | 2017 |
| Noble Signature Kitchens Limited | Wholesale & retail | 2010 |
| Nocrus Limited | Information & communication | 2016 |
| Noddwin Audio Ltd | Information & communication | 2021 |
| Noel's Bookkeeping and Payroll Company Limited | Professional & scientific | 2012 |
| Nohow Contract Services Limited | Extraterritorial | 2009 |
| Nohow International Limited | Administrative & support | 1994 |
| Noir & Notes by LB Limited | Hospitality | 2025 |
| Noldor Ltd | Information & communication | 2025 |
| Non-Stop Cleaners Limited | Administrative & support | 2018 |
| Nonno's Deli Limited | Hospitality | 2015 |
| Noorrix Logistics Ltd | Transport & logistics | 2026 |
| Noorrix Ltd Ltd | Wholesale & retail | 2026 |
| Noorrix Motors Ltd | Wholesale & retail | 2026 |
| Noovos Group Ltd | Other services | 2024 |
| Noranna Group Limited | Real estate | 2025 |
| Norbrook Developments Limited | Real estate | 1997 |
| Nori Brickwork Limited | Construction | 2026 |
| Normela Ltd | Information & communication | 2025 |
| Norse IT Limited | Information & communication | 2021 |
| Norse Precision Castings Limited | Manufacturing | 1977 |
| North Beds Limited | Mining & quarrying | 2012 |
| North Hertfordshire Building Company Limited | Construction | 2007 |
| North Street Rushden Limited | Construction | 2018 |
| Northampton Plaster Co Limited | Construction | 2015 |
| Northampton TKD Limited | Other services | 2016 |
| Northbridge Wharf Management Company Limited | Households | 1995 |
| Northill Developments Limited | Construction | 2014 |
| Northill Homes Limited | Real estate | 2021 |
| Northwind Marketing Ltd. | Administrative & support | 2013 |
| Northwood Project Management Limited | Professional & scientific | 2012 |
| Norto Productions Limited | Information & communication | 2016 |
| Norton Hill Systems Ltd | Professional & scientific | 2025 |
| Norton Properties (Essex) Limited | Construction | 1993 |
| Noruva Enterprise Ltd | Extraterritorial | 2025 |
| NOS Communicare Ltd | Information & communication | 2012 |
| NOT Guilty App Ltd | Information & communication | 2025 |
| Notanotherjobapplication Limited | Professional & scientific | 2026 |
| Notsap Ltd | Construction | 2023 |
| Nottingham Flexo Limited | Manufacturing | 1998 |
| Noulton Properties Limited | Real estate | 2017 |
| Nova C&S Solutions Ltd | Professional & scientific | 2023 |
| Nova Residential Homes Ltd | Health & social care | 2026 |
| Nova Skincare Ltd | Other services | 2025 |
| Novadrip Store Ltd | Wholesale & retail | 2025 |
| Novakin Limited | Construction | 2026 |
| Novakovic & Co Accountants Ltd | Professional & scientific | 2009 |
| Novakovic & Co Limited | Professional & scientific | 2002 |
| Novalex Limited | Professional & scientific | 2008 |
| Novall Limited | Education | 2007 |
| Novapak Equipment Limited | Manufacturing | 2003 |
| Novell Roofing Ltd | Construction | 2020 |
| Novus Cafe Ltd | Hospitality | 2026 |
| Novus Libertas Limited | Health & social care | 2018 |
| Novus MGM Ltd | Information & communication | 2024 |
| Nowbim Limited | Professional & scientific | 2024 |
| NOX Capital Holdings Limited | Financial services | 2024 |
| Npbl Healthcare Ltd | Health & social care | 2014 |
| NR Admin Services Ltd | Administrative & support | 2021 |