| MXD Limited | Information & communication | 1998 |
| My Eco Move Group Limited | Financial services | 2025 |
| My Eco Move Limited | Information & communication | 2022 |
| My Montessori Way Ltd | Health & social care | 2025 |
| My Skills for Life Limited | Professional & scientific | 2013 |
| My Wild Life Ltd | Administrative & support | 2009 |
| Myster Ltd | Information & communication | 2018 |
| N & a Management Company Limited | Hospitality | 2007 |
| N and N Property Group Ltd | Hospitality | 2026 |
| N Brewer Construction Ltd | Administrative & support | 2014 |
| N P Tripp Roofing Limited | Construction | 2002 |
| N S M Properties Limited | Construction | 2003 |
| N&D Sheppard Limited | Agriculture & fishing | 2008 |
| N. M. Smith Limited | Financial services | 2008 |
| N.B.A. Refrigeration Company Limited | Manufacturing | 1986 |
| N.Vassie Ltd | Professional & scientific | 2022 |
| Nair Properties Limited | Extraterritorial | 1919 |
| Namashi Holdings Limited | Extraterritorial | 2024 |
| Namashi Ltd | Information & communication | 2021 |
| Naos Education Limited | Education | 2011 |
| Napthine Porter Ltd | Professional & scientific | 2010 |
| Natalie Howson Skin Specialist Limited | Other services | 2013 |
| Natasha Collins Real Estate Limited | Administrative & support | 2017 |
| Nathan Davis Limited | Construction | 2024 |
| National Credit Control Centre Ltd | Administrative & support | 2026 |
| Natural Apptitude Limited | Information & communication | 2013 |
| Natural Numbers Limited | Professional & scientific | 2007 |
| Nature Conservation Ltd | Arts & recreation | 2025 |
| Naturesway (Wiltshire) Ltd | Administrative & support | 2016 |
| Nautilus Financial Planning Limited | Financial services | 2007 |
| Nbfsr Limited | Professional & scientific | 2015 |
| NC & NCC Investments Limited | Construction | 2018 |
| NC Property Holdings Ltd | Real estate | 2021 |
| NCM Advisory Ltd | Other services | 2018 |
| ND Drink Solutions Ltd | Other services | 2010 |
| Needham Property Ltd | Real estate | 2022 |
| Neepa Healthcare Ltd | Health & social care | 2018 |
| Neex Neco & Deba Ltd | Hospitality | 2017 |
| Neil Hudson Sales Consultancy Ltd | Administrative & support | 2016 |
| Neil Johnston Creative Limited | Information & communication | 2023 |
| Neil Project Management Ltd | Construction | 2021 |
| Neil Wells Brickwork Limited | Construction | 2005 |
| Nektar Natura UK Limited | Manufacturing | 2025 |
| Nemo Sales Ltd | Wholesale & retail | 2025 |
| Neoform Limited | Professional & scientific | 2013 |
| Neon Events and Marketing Limited | Arts & recreation | 2009 |
| Nesh Limited | Professional & scientific | 2008 |
| Nest SW Ltd | Real estate | 2025 |
| Nesthappy Limited | Information & communication | 2026 |
| Netflection Consulting Ltd | Information & communication | 2006 |
| Netherstreet Enterprises Ltd | Agriculture & fishing | 2021 |
| Netspin Limited | Information & communication | 1995 |
| Netuser Limited | Information & communication | 2003 |
| Network X Limited | Information & communication | 2017 |
| Networkology Ltd | Information & communication | 2013 |
| Neufdixneuf Ltd | Wholesale & retail | 2025 |
| Neuman Consulting Limited | Professional & scientific | 2017 |
| Neutopia Ltd | Manufacturing | 2025 |
| Nevbservices Limited | Construction | 2025 |
| New Build Flooring Limited | Wholesale & retail | 2015 |
| New Century Electronic Ltd | Professional & scientific | 2020 |
| New Holborn Limited | Other services | 2021 |
| New House Farm (Marshfield) Ltd | Agriculture & fishing | 2023 |
| New Metropolis Limited | Real estate | 2006 |
| New Mortgage Services Ltd | Financial services | 2021 |
| New Road Restaurant Ltd | Hospitality | 2025 |
| New Station Developments Ltd. | Administrative & support | 1981 |
| New World Chippenham Limited | Hospitality | 2021 |
| NEWCO01 Ltd | Construction | 2024 |
| Newleaf Property Development & Maintenance Ltd | Construction | 2009 |
| Nexusgermanica Ltd | Wholesale & retail | 2018 |
| Nfor and Brothers Limited | Health & social care | 2019 |
| NHF Global Limited | Transport & logistics | 2023 |
| Nick & Co Estate Agents Limited | Real estate | 2006 |
| Nick Brain Hairdressing Limited | Other services | 2003 |
| Nick Carey Ltd | Professional & scientific | 2024 |
| Nick Pocock Electrical Limited | Construction | 2017 |
| Nick Rule Farrier Limited | Administrative & support | 2004 |
| Nids Holding Limited | Financial services | 2023 |
| Nighthawk Property Limited | Administrative & support | 2003 |
| Nikhols Holdings Limited | Real estate | 2021 |
| Nilsson Services Limited | Information & communication | 2023 |
| Nimble Care Ltd | Health & social care | 2017 |
| Nine Consulting Limited | Information & communication | 2009 |
| Niru Trader Ltd | Wholesale & retail | 2026 |
| NLG Visuals Ltd | Information & communication | 2011 |
| NM Jones Plant & Groundworks Limited | Construction | 2003 |
| NM Media Ltd. | Information & communication | 2018 |
| NMC Architectural Limited | Professional & scientific | 2007 |
| NO September Ltd | Professional & scientific | 2019 |
| Noble Decor Hire Ltd | Administrative & support | 2025 |
| Noble PUB Group Ltd | Hospitality | 2024 |
| Nodus Consulting Limited | Professional & scientific | 2025 |
| Noisemonger Ltd | Arts & recreation | 2023 |
| Nollo Bathroom Design Ltd | Wholesale & retail | 2024 |
| Nomi Homeware Limited | Wholesale & retail | 2023 |
| Nomis Ventures Ltd | Professional & scientific | 2018 |
| Nonesuch Books Ltd | Wholesale & retail | 2026 |
| Nonsuch Nurseries Limited | Wholesale & retail | 2013 |
| North Coast Devon Limited | Real estate | 2009 |