| Nanosoft Tuitions Ltd | Education | 2024 |
| Napier House Trustees Limited | Administrative & support | 2003 |
| Nappa Management Limited | Transport & logistics | 1980 |
| Narcissus Gardens Limited | Administrative & support | 2002 |
| Narrow Road Capital Ltd | Financial services | 2022 |
| Nash House Ventures Ltd | Professional & scientific | 2024 |
| Naskan Ltd | Real estate | 2023 |
| Natacha Cyrine Seghair Ltd | Information & communication | 2022 |
| Natbrands Ltd | Wholesale & retail | 1999 |
| Nathan Edwards Racing Ltd | Arts & recreation | 2024 |
| National Schools Equestrian Association Ltd | Arts & recreation | 2009 |
| National Tortoise Sanctuary | Agriculture & fishing | 2025 |
| Natural Craft Ltd | Construction | 2026 |
| Natural Healing Ltd | Health & social care | 2020 |
| Natural Light Films Limited | Professional & scientific | 1991 |
| Natural Search and Selection Limited | Administrative & support | 2008 |
| Natural Search Limited | Extraterritorial | 2022 |
| Natural Search Trustees Limited | Professional & scientific | 2025 |
| Naturalpackagingco Ltd | Manufacturing | 2025 |
| Naveed'Secommerce Ltd | Wholesale & retail | 2024 |
| Navizone Ltd | Professional & scientific | 2001 |
| Naylor Accountancy Services Ltd | Professional & scientific | 2011 |
| Nazgul Trading Limited | Financial services | 2009 |
| NC Services Ltd | Construction | 2018 |
| NDK Consulting Group LLP | | 2023 |
| NDK Consulting Holdings Limited | Financial services | 2023 |
| NDK Consulting.Co.Uk Limited | Administrative & support | 2004 |
| NDK Cyber Recruitment Limited | Administrative & support | 2016 |
| NDK Infosec LLP | | 2018 |
| NDK Property Investment Limited | Real estate | 2019 |
| NDK Property Management LLP | | 2019 |
| Nedhil Ventures Ltd | Health & social care | 2024 |
| Negtransporter Ltd | Transport & logistics | 2021 |
| Neighbourhood Guardian Services Ltd | Administrative & support | 2026 |
| Neil Slater & Associates Opinions Limited | Real estate | 2012 |
| Nelly LEY Jewellery Workshop Ltd | Other services | 2025 |
| Nelly LEY Ltd. | Manufacturing | 2016 |
| Nemesis Computing Services Limited | Information & communication | 1994 |
| Nemus Tree and Garden Care Limited | Administrative & support | 2012 |
| Nenyo Consulting Ltd | Information & communication | 2023 |
| Neofin Ltd | Information & communication | 2021 |
| Neon Technologies Ltd | Professional & scientific | 2009 |
| NES Haulage UK Ltd | Transport & logistics | 2026 |
| Nest & Fern Limited | Wholesale & retail | 2020 |
| Nestian Exclusives Ltd | Real estate | 2021 |
| NET4ALL Limited | Arts & recreation | 2022 |
| Nether Pixel Studios Limited | Information & communication | 2017 |
| Netherton Investments (Padstow) Limited | Real estate | 2021 |
| Nettlestead Associates Ltd | Professional & scientific | 2015 |
| NETWORKS4TV Limited | Information & communication | 2007 |
| Neural Risk Solutions Ltd | Financial services | 2025 |
| Neurita Ltd | Manufacturing | 2021 |
| Neurojava Limited | Professional & scientific | 2024 |
| Never Enough Ltd | Wholesale & retail | 2016 |
| Nevill Gardens (Tunbridge Wells) Management Limited | Households | 2007 |
| Nevill Management Company Limited | Real estate | 2023 |
| Nevill Park Road Limited | Administrative & support | 1958 |
| Neville House JV Ltd | Construction | 2024 |
| Neville House Tunbridge Wells Management Ltd | Households | 2026 |
| Neville Terrace Ltd | Construction | 2021 |
| New Cambridge Project Management Ltd | Information & communication | 2025 |
| New Consulting Ltd | Hospitality | 2007 |
| New House Farm (Bodiam) Limited | Agriculture & fishing | 1998 |
| New House Leisure Limited | Real estate | 2000 |
| New Jimmy's Cafe Limited | Hospitality | 2007 |
| New Pages Limited | Wholesale & retail | 2018 |
| New Shoes Theatre | Arts & recreation | 2009 |
| New Steps Care Ltd | Other services | 2025 |
| Newfoodsolutions Ltd | Wholesale & retail | 2024 |
| Newington Green (Sittingbourne) Management Company Limited | Construction | 2026 |
| Newland Enterprises Limited | Wholesale & retail | 2021 |
| Newlands Healthcare Limited | Administrative & support | 2009 |
| Newlands Thames Ditton (Management Company) Limited | Households | 2011 |
| Newman Estate Contractors Limited | Construction | 2000 |
| Newton Aycliffe Newsagents Ltd | Wholesale & retail | 2025 |
| Newton Lofts RTM Company Limited | Households | 2021 |
| Newton Road RTM Company Limited | Households | 2005 |
| Nexgen Foods and Supplies Ltd | Hospitality | 2025 |
| Next Electronics Ltd | Manufacturing | 2009 |
| Next Step Financial Solutions Limited | Financial services | 2005 |
| Nextgen Advisors Ltd | Financial services | 2026 |
| Nexus Health and Fitness Limited | Health & social care | 2021 |
| Nexus Residential City Residence Limited | Construction | 2020 |
| Nexus Residential Element Liverpool Ltd | Construction | 2020 |
| Nexus Residential L3 Limited | Construction | 2025 |
| Nexus Residential One Baltic Square Limited | Construction | 2018 |
| Nexus Residential One Baltic Square Management Limited | Real estate | 2021 |
| Nexus Residential Soapworks Ltd | Construction | 2020 |
| Nexus Residential Soapworks Management Ltd | Real estate | 2025 |
| Nexus Travel Limited | Administrative & support | 2025 |
| Nexus/H Limited | Extraterritorial | 1972 |
| NGT Holdings LLP | | 2019 |
| Nice Distribution Ltd | Wholesale & retail | 2016 |
| Nice TEE Ltd | Wholesale & retail | 2026 |
| Nich Properties LLP | | 2024 |
| Nick Gritton Agencies Ltd | Professional & scientific | 2016 |
| Nick Kellett Limited | Wholesale & retail | 2002 |
| Nick Lupu Ltd | Information & communication | 2024 |
| Nicola Barker Consulting Limited | Professional & scientific | 2024 |
| Nicola Neil Limited | Professional & scientific | 2012 |