| N.J.M. (Guildford) Limited | Wholesale & retail | 1985 |
| N.R. Taylor Limited | Wholesale & retail | 1991 |
| N73G Aviation Ltd | Transport & logistics | 2024 |
| N73G Limited | Transport & logistics | 2024 |
| Nabu Consulting Limited | Professional & scientific | 2009 |
| Naddict Ltd | Wholesale & retail | 2025 |
| Nae's Activities Ltd | Education | 2014 |
| Nafici Eco Cellulose Technology Limited | Professional & scientific | 2017 |
| Nafici Ecopulping Suffolk Limited | Manufacturing | 2022 |
| Nafici Environmental Research Limited | Manufacturing | 2008 |
| Nafici Group Limited | Financial services | 2019 |
| Nairn Fletcher Family Investment Company Limited | Financial services | 2023 |
| Nana & Sons Ltd | Education | 2023 |
| Nanaksar Properties Ltd | Real estate | 2024 |
| Napa 1989 Ltd | Real estate | 2024 |
| Napier Motor Company Limited | Wholesale & retail | 2008 |
| Nart Consulting Limited | Professional & scientific | 2025 |
| Naruschka Henriques Limited | Health & social care | 2008 |
| Nasc Projects Ltd | Information & communication | 2025 |
| Nasreen Ltd | Administrative & support | 2025 |
| Nathan James Property Developments Ltd | Real estate | 2024 |
| National Fdis Ltd | Construction | 2021 |
| Nations Health Limited | Health & social care | 2024 |
| Natura Enviro Ltd | Professional & scientific | 2025 |
| Natural Stone Consultants Ltd | Professional & scientific | 2019 |
| Nature Time Limited | Health & social care | 2008 |
| Navyf Ltd | Wholesale & retail | 2026 |
| Ncsm Media Limited | Information & communication | 2014 |
| Neals Restaurants Ltd | Hospitality | 2008 |
| Neat & Stripy Limited | Administrative & support | 2008 |
| Neate Holdings Limited | Financial services | 2022 |
| Nectar Marquees Limited | Administrative & support | 2026 |
| Need's Farm Flowers Limited | Agriculture & fishing | 2025 |
| Neighbourhood (Housing) Solutions Limited | Extraterritorial | 2009 |
| Neil Harding Loft Ladders Ltd | Construction | 2021 |
| Neilson Boutique - Forest ROW Ltd | Wholesale & retail | 2010 |
| Neilson Boutique Southern Ltd | Wholesale & retail | 2010 |
| Nekta LAB Ltd | Information & communication | 2025 |
| Nelson Mews Management Company Limited | Households | 2011 |
| Nelson Training Services Ltd | Professional & scientific | 2019 |
| Neoballet Limited | Arts & recreation | 2016 |
| Neogroup.Ai Limited | Financial services | 2022 |
| Neoscape Design Studio Ltd | Professional & scientific | 2019 |
| NET Activate.Com Limited | Professional & scientific | 2000 |
| Net-A-Kitchen Ltd | Wholesale & retail | 2024 |
| Nets Branding Limited | Administrative & support | 2025 |
| Nets International Holdings Ltd | Financial services | 2023 |
| Netsol Technologies Europe Limited | Information & communication | 1986 |
| Netsol Technologies Limited | Extraterritorial | 2002 |
| Network Factoring Limited | | 1984 |
| Network GSA Ltd | Administrative & support | 2016 |
| Network Installations Limited | Information & communication | 1983 |
| Network UK Uniform Limited | Wholesale & retail | 2006 |
| Neuro Connect Therapeutic and Educational Group Limited | Health & social care | 2025 |
| Neurovasc Ltd | Wholesale & retail | 2024 |
| Neverguesswhat Ltd | Professional & scientific | 2025 |
| Nevill Argyle Ltd | Manufacturing | 2018 |
| New AGE Spirit Limited | Extraterritorial | 1999 |
| New Design 20 Ltd | Manufacturing | 2020 |
| New Heights Consulting Ltd | Professional & scientific | 2019 |
| New Horizon Strategies Limited | Professional & scientific | 2022 |
| New Jumbo Ltd | Hospitality | 2026 |
| New Prospect Consulting Limited | Information & communication | 2011 |
| Newamport Company Ltd | Extraterritorial | 2014 |
| Newcombe Management Limited | Real estate | 2025 |
| Newdigate Farms Limited | Agriculture & fishing | 1952 |
| Newman Bros Tone Ltd | Wholesale & retail | 2021 |
| Newman Developments Limited | Construction | 1988 |
| Newmarket Corporate Member Limited | Financial services | 1999 |
| Newpark Properties Limited | Real estate | 1964 |
| Newrose Residential Ltd | Professional & scientific | 2014 |
| Newsprintuk Limited | Wholesale & retail | 2022 |
| Nexada Ltd | Hospitality | 2025 |
| Nexora Management Limited | Wholesale & retail | 2024 |
| Nexora Paye Team a Ltd | Administrative & support | 2026 |
| Nexora Paye Team B Ltd | Administrative & support | 2026 |
| Nexora Paye Team C Ltd | Administrative & support | 2026 |
| Nexora Paye Team D Ltd | Administrative & support | 2026 |
| Nexora Paye Team Ltd | Administrative & support | 2026 |
| Next Phase Recruitment Holdings Limited | Financial services | 2016 |
| Nexus United Ltd | Construction | 2024 |
| NFH Accountancy Limited | Professional & scientific | 2024 |
| NFM Property Ltd | Real estate | 2022 |
| Nfts Flat Space Art Limited | Arts & recreation | 2021 |
| NGK Autos Limited | Wholesale & retail | 2025 |
| Nglp Holdings Limited | Professional & scientific | 2025 |
| NHA Energy Consultants Ltd | Professional & scientific | 2017 |
| Nich Projects Limited | Financial services | 2013 |
| Niche Products Limited | Professional & scientific | 2020 |
| Nicholas J FOX Limited | Construction | 2010 |
| Nicholson & Underwood Limited | Construction | 2002 |
| Nick Harvey Management Limited | Other services | 2004 |
| Nick Taylor Limited | Wholesale & retail | 2008 |
| Nicks Historical Tours Ltd | Administrative & support | 2023 |
| Nicky Macfarlane Consulting Limited | Professional & scientific | 2020 |
| Nigel Wait Building and Carpentry Limited | Construction | 2011 |
| Night Garden Limited | Professional & scientific | 2012 |
| Nightingale Professional Ltd | Health & social care | 2022 |
| Nikunjo UK Ltd | Hospitality | 2023 |
| NINETEEN72 Performance Ltd | Wholesale & retail | 2023 |