| Namah Ltd | Information & communication | 2015 |
| Namaste Mortgages Ltd | Financial services | 2026 |
| Namwaske Ltd | Professional & scientific | 2013 |
| Nano Media Ltd | Information & communication | 2025 |
| Nash and Hodge Engineers Limited | Professional & scientific | 1951 |
| Nash Precision Engineering Ltd | Manufacturing | 2009 |
| Natha Ecommerce Solutions Ltd | Information & communication | 2018 |
| Nathan & Nathan UK Limited | Administrative & support | 2021 |
| Nathan Digital UK Ltd | Information & communication | 2024 |
| Nathan Nash Film Ltd | Information & communication | 2024 |
| Nathan Russell Construction Ltd | Construction | 2025 |
| National Builders Limited | Construction | 2023 |
| National Garden Home Ltd | Administrative & support | 2026 |
| National Independent Consumer Organisation | Education | 2001 |
| National Masonry Academy Limited | Education | 2024 |
| National Training & Consultancy Services Ltd. | Education | 2018 |
| Natra Limited | Wholesale & retail | 2018 |
| Natsa Steps Limited | Administrative & support | 2013 |
| Natural Beauty Basingstoke Ltd | Other services | 2022 |
| Natural Dog Noms Ltd | Wholesale & retail | 2022 |
| Naturally Legit Ltd | Manufacturing | 2020 |
| Naustec Ltd | Information & communication | 2026 |
| Nautilus UK Bidco Limited | Financial services | 2024 |
| Navara Logistics Ltd | Transport & logistics | 2018 |
| Navigator International Logistics Ltd | Transport & logistics | 2019 |
| Navocean UK Limited | Transport & logistics | 2015 |
| Navodit Ltd | Education | 2025 |
| Navsar Ltd | Health & social care | 2023 |
| Nblaz Consulting Limited | Other services | 2024 |
| ND Facades Limited | Construction | 2022 |
| ND Landscapes Limited | Administrative & support | 2022 |
| Ndelecare Ltd | Administrative & support | 2018 |
| NE Prime Properties Ltd | Real estate | 2024 |
| Neale Turk LLP | | 2009 |
| Near Water UK Limited | Real estate | 2015 |
| Nearly Irish Limited | Wholesale & retail | 2024 |
| Nebula NAS Limited | Information & communication | 2025 |
| NED Removals Ltd | Transport & logistics | 2025 |
| Need ALL Ltd | Extraterritorial | 2024 |
| Need IT Doing? Ltd | Construction | 2026 |
| Needmain Limited | Hospitality | 1979 |
| Neek Labs Limited | Information & communication | 2025 |
| Nefise’S Insights Ltd | Professional & scientific | 2024 |
| Neil Dainton Golf Consultancy Limited | Arts & recreation | 2014 |
| Neil Minton Life Planning Ltd | Financial services | 2025 |
| NEO Design & Build Limited | Construction | 2020 |
| Neon People Group Limited | Financial services | 2025 |
| Neon People Limited | Professional & scientific | 2025 |
| Neon Pepper HR Ltd | Administrative & support | 2026 |
| Nephi Ltd | Real estate | 2003 |
| Nerdexpress Limited | Information & communication | 2018 |
| Nested Hermitage Daycare Limited | Education | 2023 |
| Netactive UK Limited | Extraterritorial | 2000 |
| Netproviso Limited | Information & communication | 2014 |
| Nettle and Fern Gardening Ltd | Administrative & support | 2024 |
| New City Gourmet Ltd | Hospitality | 2023 |
| New Creation Private Limited | Hospitality | 2026 |
| New Horizon Care Limited | Health & social care | 2019 |
| New Ideal KBS Ltd | Construction | 2018 |
| New Star Networks Ltd | Information & communication | 2010 |
| New Winchester Sushi Ltd | Wholesale & retail | 2022 |
| Newcastle Under Lyme Dental Practice Ltd | Health & social care | 2013 |
| Newclark Property Limited | Real estate | 2017 |
| Newelco (Uskside) Limited | Manufacturing | 1883 |
| Newlake Studios Ltd | Information & communication | 2024 |
| Newmans Chocolates Limited | Professional & scientific | 1937 |
| Newpop Holdings Ltd | Real estate | 2024 |
| Newton Star Ltd | Transport & logistics | 2026 |
| Nexafusion Limited | Information & communication | 2023 |
| Nexia Limited | Administrative & support | 2023 |
| Nexora Consolidated Limited | Information & communication | 2026 |
| Next HOP Harness Consulting Limited | Information & communication | 2018 |
| Nextlaundry Limited | Other services | 2024 |
| Nexus Comms Ltd | Information & communication | 2026 |
| Nexus UK Investments Ltd | Real estate | 2020 |
| Ngwh Limited | Health & social care | 2017 |
| NH Clinics Limited | Health & social care | 2019 |
| Niaz Global Ltd | Wholesale & retail | 2024 |
| Niccy Naccy NOO Limited | Real estate | 2025 |
| Niche Collective Ltd | Wholesale & retail | 2026 |
| Niche Marketing & Design Limited | Professional & scientific | 2012 |
| Nicholas Creativity Ltd | Professional & scientific | 2023 |
| Nick Cargo Trans Ltd | Transport & logistics | 2025 |
| Nick Compton Construction Limited | Construction | 2011 |
| Nick Manuel Ltd | Construction | 2007 |
| Nico Painting Ltd | Construction | 2024 |
| Nicolov Logistics Ltd | Transport & logistics | 2017 |
| Nield Homes Limited | Real estate | 2025 |
| Nield Property Limited | Real estate | 2019 |
| Nightball Holdings Limited | Financial services | 2025 |
| Nightball Technologies Limited | Information & communication | 2020 |
| Nightingale Project Management Ltd | Construction | 2018 |
| Nihitech Ltd | Information & communication | 2016 |
| Nikola Sky Ltd | Transport & logistics | 2017 |
| Nikomi Ltd | Manufacturing | 2019 |
| Niksons Transport Ltd | Transport & logistics | 2018 |
| Nimba Services Ltd | Transport & logistics | 2022 |
| Nimbus Experiences (Chipping Norton) Ltd | Real estate | 2026 |
| Nimbus Property Developments Ltd | Construction | 2010 |
| Nine Bears Consultancy Limited | Professional & scientific | 2020 |