| New Road Capital Holdings Ltd | Financial services | 2025 |
| New Road Capital Ltd | Real estate | 2025 |
| New Seasons Investments Ltd | Real estate | 2017 |
| New Star 66 Ltd | Hospitality | 2022 |
| New-Homes Real Estate UK Ltd | Real estate | 2025 |
| Newandtrading Properties Limited | Administrative & support | 2007 |
| Newark Black Limited | Administrative & support | 2024 |
| Newberry Court Management Company Limited | Households | 1998 |
| Newbridge Premium Pots Ltd | Wholesale & retail | 2020 |
| Newcomers AID CIC | Education | 2025 |
| Newcrest (Cambourne NO 2) Limited | Construction | 2017 |
| Newcrest Bedford Limited | Construction | 2017 |
| Newcrest Cambourne Limited | Construction | 2011 |
| Newcrest Ebbsfleet Limited | Construction | 2016 |
| Newcrest Estates Limited | Construction | 2011 |
| Newden Property Services Limited | Real estate | 2005 |
| Newglobe Resources Limited | Wholesale & retail | 2012 |
| Newleaf Oasis Limited | Health & social care | 2024 |
| Newmarket Printer Cartridges Limited | Wholesale & retail | 2024 |
| Newnham Road Residents' Association Limited | Households | 1987 |
| Newpath Supported Living Ltd | Health & social care | 2025 |
| Newport Executor and Trustee Company Limited | Extraterritorial | 1963 |
| Newtech Intelligent Automation Limited | Manufacturing | 1984 |
| Newton Longville PUB Limited | Administrative & support | 2025 |
| Newton Specialist Ltd | Construction | 2020 |
| Newton Sports Consultancy Ltd | Arts & recreation | 2023 |
| Newton Survey and Developments Limited | Construction | 1981 |
| Newway Conservatories Ltd | Construction | 2017 |
| Nexgen Automation Ltd Ltd | Professional & scientific | 2026 |
| Nexgen Integrated Services Ltd | Information & communication | 2019 |
| Nexgen IT Services Limited | Information & communication | 2016 |
| Nexgen Property Services Ltd | Real estate | 2022 |
| Nexora Group Ltd | Wholesale & retail | 2025 |
| Nexoraa Limited | Information & communication | 2025 |
| Next Door Lets Ltd | Real estate | 2024 |
| Next Door Retail Limited | Arts & recreation | 2017 |
| Next Level Capital Ltd | Financial services | 2020 |
| Next Level Engineering Ltd | Professional & scientific | 2024 |
| Next Level Scaffolding Services Ltd | Construction | 2020 |
| Next Phase Fitness Ltd | Health & social care | 2026 |
| Nextbridge Ltd | Wholesale & retail | 2026 |
| Nextform Projects Ltd | Construction | 2025 |
| Nextgen Hair & Beauty Training Limited | Education | 2025 |
| Nextgen Hardware Limited | Wholesale & retail | 2024 |
| Nexthome Housing Ltd | Real estate | 2026 |
| Nextwave Logistics Ltd | Transport & logistics | 2025 |
| Nexus Compliance Ltd | Professional & scientific | 2023 |
| Nexus Consult Plus Limited | Other services | 2024 |
| Nexus I B Limited | Financial services | 2020 |
| Nexus Safety Ltd | Professional & scientific | 2024 |
| Nexus Trove Holdings Limited | Real estate | 2023 |
| Nexus UK Investigations Ltd | Professional & scientific | 2019 |
| Neya Home Limited | Real estate | 2025 |
| NF Asset Management Company Limited | Real estate | 2017 |
| NFC Tank Haulage Limtied | Professional & scientific | 1969 |
| NG Ranasinghe Ltd | Real estate | 2026 |
| NGB Homes Ltd | Health & social care | 2024 |
| NH11HOMES Limited | Real estate | 2021 |
| NH99 Limited | Construction | 2026 |
| NI Healthcare Ltd | Health & social care | 2021 |
| NIA Recruitment Services Limited | Administrative & support | 2026 |
| Nibash Properties Ltd | Construction | 2020 |
| Nibbleyourtipple Ltd | Hospitality | 2018 |
| Nice Family Consultants Limited | Information & communication | 2011 |
| Nicer Consulting Limited | Professional & scientific | 2025 |
| Nicholas Worrall Limited | Construction | 2010 |
| Nick Clifton ENT Ltd | Health & social care | 2020 |
| Nick Gwynne Tattoo Limited | Wholesale & retail | 2022 |
| Nick Knacks Ltd | Wholesale & retail | 2006 |
| Nick Little Creative Limited | Administrative & support | 2014 |
| Nick Sinfield Physiotherapy Ltd | Health & social care | 2019 |
| Nickay Holdings Ltd | Professional & scientific | 2026 |
| Nickybells Limited | Health & social care | 2022 |
| Nicnad Limited | Health & social care | 2023 |
| Nico&Cris Ltd | Wholesale & retail | 2020 |
| Nicola Antonaccio Online Coaching Ltd | Other services | 2021 |
| Nicola Brady Ltd | Professional & scientific | 2026 |
| Nicole Brooke Limited | Administrative & support | 2011 |
| Nicolson Telecommunications Limited | Information & communication | 2006 |
| Niconec Limited | Health & social care | 2018 |
| Nigel Darren Cherry Holdings Ltd | Financial services | 2021 |
| Nightingale Finance Limited | Financial services | 1988 |
| Nightingale Security Services Ltd | Administrative & support | 2015 |
| Nightpark Developments Ltd | Real estate | 2019 |
| Niimcy JAY Ltd | Real estate | 2024 |
| Nijjer Property Group Ltd | Real estate | 2017 |
| Nikale Ltd | Construction | 2019 |
| Nikisnewrides Limited | Wholesale & retail | 2025 |
| Nikk Company Ltd | Administrative & support | 2021 |
| Nikki Godden Ltd | Other services | 2023 |
| Nikkypye Consulting Ltd | Health & social care | 2023 |
| Nile Business Services Ltd | Mining & quarrying | 2018 |
| Nimerals Ltd | Extraterritorial | 2021 |
| Nine Industries Ltd | Manufacturing | 2021 |
| Nine Kitchens & Bedrooms Ltd | Construction | 2021 |
| Nine Lives Software Limited | Information & communication | 2013 |
| Nine Yard Events Ltd | Hospitality | 2021 |
| Nineacres Consulting Limited | Other services | 2011 |
| Niro Digital Ltd | Professional & scientific | 2025 |
| Nirvana Inc. Limited | Real estate | 2005 |