| NAV Ubhi Laser & Beauty Ltd | Other services | 2019 |
| Navitas Solutions Limited | Information & communication | 2004 |
| NB VA Services Ltd | Administrative & support | 2025 |
| NCM Editorial & Copywriting Limited | Professional & scientific | 2008 |
| NE Plus Ultra Consulting Limited | Professional & scientific | 2010 |
| Nebula Global Services Limited | Other services | 2020 |
| Nectarine Studio Ltd | Administrative & support | 2022 |
| Neddy Dean Productions (SON) Limited | Information & communication | 2021 |
| Neemdor Ltd | Information & communication | 2025 |
| Neighbourhood Work Centres Limited | Administrative & support | 1993 |
| Neil & SON Cleaning Limited | Administrative & support | 2019 |
| Neil Curtis & Sons Funeral Contractors Limited | Other services | 2005 |
| Neil Curtis & Sons Landscapes Ltd | Administrative & support | 2024 |
| Nelfin Ltd | Financial services | 2021 |
| Nemo Business Management Limited | Wholesale & retail | 2005 |
| Nemo Racing Limited | Wholesale & retail | 2019 |
| NEO Ventures Group Ltd | Wholesale & retail | 2026 |
| Neo-Plan Consulting Limited | Information & communication | 2025 |
| Neon Daddy Limited | Professional & scientific | 2021 |
| Neon Leaders Limited | Professional & scientific | 2026 |
| Neonstone Limited | Information & communication | 2009 |
| Neptune Property Group Limited | Construction | 2025 |
| Nervecentre Software Ltd | Information & communication | 2010 |
| Nestable Limited | Real estate | 2024 |
| NET Enterprise Holdings Limited | Professional & scientific | 2026 |
| Netcomm Services Limited | Professional & scientific | 2015 |
| Netlink Communications Limited | Information & communication | 1998 |
| Netlink Fttx Ltd | Information & communication | 2022 |
| Netlink Utilities Ltd | Construction | 2024 |
| Netperformance Management Ltd | Professional & scientific | 2021 |
| Netreo UK Limited | Wholesale & retail | 2020 |
| Netserv Inc Limited | Information & communication | 2014 |
| Nettle PIE Productions Ltd | Information & communication | 2025 |
| Network 24 Limited | Information & communication | 2006 |
| Network Solutions Services Limited | Information & communication | 2008 |
| Neuralnetica Limited | Information & communication | 2024 |
| Neuro Assessment Hub Ltd | Health & social care | 2025 |
| Never Ending Bubbles Ltd | Manufacturing | 2025 |
| Neverland Skincare Ltd | Other services | 2017 |
| New Brightsource Energy UK Limited | Information & communication | 2022 |
| New Build Landscaping Ltd | Administrative & support | 2020 |
| New Court Managements Limited | Households | 1964 |
| New Information Paradigms Limited | Information & communication | 1988 |
| New Management Paradigms Limited | Professional & scientific | 1988 |
| New Media Medicine Ltd | Education | 2012 |
| New PAD Ltd | Real estate | 2024 |
| New Road Porthcawl Properties LLP | | 2016 |
| New Spirit Naturals Limited | Wholesale & retail | 1999 |
| New to YOU Automotive Limited | Wholesale & retail | 2026 |
| Newbourne (Catford Hill) Limited | Construction | 2021 |
| Newbourne Properties Limited | Construction | 2012 |
| Newbridge Advisory Limited | Professional & scientific | 2019 |
| Newcastle South L and a Limited | Administrative & support | 2025 |
| Newcraft Roofing & Building Ltd | Construction | 2023 |
| Newey Mccartney Holdings Ltd | Other services | 2019 |
| Newstep Limited | Professional & scientific | 2004 |
| Newton Developments Ltd | Real estate | 2020 |
| Nexgen Innovation Consulting Limited | Professional & scientific | 2011 |
| Nexient Consulting Ltd | Information & communication | 2024 |
| Nexnova Ltd | Information & communication | 2021 |
| Nexo Technologies Ltd | Information & communication | 2025 |
| Next Level Landscapes Ltd. | Administrative & support | 2018 |
| Next State (UK) Limited | Professional & scientific | 2024 |
| Next State Ventures (UK) Limited | Information & communication | 2025 |
| Next Steps Occupational Therapy Ltd | Other services | 2025 |
| Nextauto UK Ltd | Wholesale & retail | 2020 |
| Nextgen Holdings Limited | Information & communication | 2006 |
| Nextgen Technology Limited | Information & communication | 2004 |
| Nextsuss Limited | Wholesale & retail | 2025 |
| Nexus Engineering and Utilities Limited | Professional & scientific | 2025 |
| Nexus Property Partners Ltd | Administrative & support | 2024 |
| NF Consultancy Ltd | Health & social care | 2024 |
| NGD Media Ltd | Professional & scientific | 2018 |
| Ngozika Catering Ltd | Hospitality | 2026 |
| Nicam Projects Ltd | Real estate | 2025 |
| Nicara Branded Merchandise Limited | Wholesale & retail | 2024 |
| Nice Resourcing Ltd | Administrative & support | 2019 |
| Nicetime App Limited | Information & communication | 2025 |
| Nick Hall Coaching Ltd | Professional & scientific | 2023 |
| Nicky Morris Travel Limited | Administrative & support | 2025 |
| Nicky Rees Marketing Ltd | Professional & scientific | 2015 |
| Nicola Florist Limited | Wholesale & retail | 2025 |
| Nicola Roest Limited | Professional & scientific | 2015 |
| Nicola Sims Consulting Limited | Professional & scientific | 2007 |
| Nicoletti Consulting Ltd | Information & communication | 2023 |
| Nigel Sullivan Surveying Ltd | Professional & scientific | 2016 |
| Night Time Stories Limited | Information & communication | 2009 |
| NIM Air Limited | Transport & logistics | 2025 |
| Nimia Coffee Ltd | Hospitality | 2022 |
| Ninety Plus Five Ltd | Wholesale & retail | 2026 |
| Niococktails UK Ltd | Wholesale & retail | 2019 |
| Nirvana Spa & Leisure Limited | Arts & recreation | 1971 |
| Nivetha Properties Limited | Real estate | 2017 |
| Niyonika Consultancy Ltd | Wholesale & retail | 2022 |
| NJC Labs Limited | Information & communication | 2019 |
| NJM Racing Ltd | Other services | 2018 |
| NLH Therapy Ltd | Health & social care | 2023 |
| NLK Consulting Ltd | Information & communication | 2013 |
| NMT Consulting Limited | Administrative & support | 2015 |
| Nnbtv Software Limited | Information & communication | 2013 |