| Nant DDU Lodge Hotel Holding Ltd | Financial services | 2024 |
| Nant DDU Lodge Hotel Limited | Hospitality | 1994 |
| NAO Creative Ltd | Professional & scientific | 2019 |
| Napoletana UK Ltd | Hospitality | 2018 |
| Napoli Lavoro Equipment Ltd | Administrative & support | 2020 |
| Napoli Lavoro Ltd | Real estate | 2020 |
| Nappy Endings Limited | Other services | 2017 |
| Nasus Limited | Information & communication | 2016 |
| Natasha Denona Make UP Ltd. | Wholesale & retail | 2015 |
| Natasha Foundation Limited | Education | 2011 |
| Nationwide Homes and Lets Ltd | Real estate | 1996 |
| Natjak Ltd | Financial services | 2019 |
| Natural Form Limited | Wholesale & retail | 1990 |
| Natural Hair UK Limited | Administrative & support | 2008 |
| Natural Milk Boost Limited | Other services | 2019 |
| Natural Voices Choirs Limited | Other services | 2025 |
| Navillus Electrical Ltd | Extraterritorial | 2015 |
| Navitas Electrical Limited | Construction | 2009 |
| Nawat Investments Ltd | Construction | 2016 |
| NB Nail Company Ltd | Other services | 2025 |
| NB Potters Bar Limited | Other services | 2022 |
| NBC Promotions Limited | Wholesale & retail | 2019 |
| Nbdesai Ltd | Professional & scientific | 2025 |
| Nchl Investments Ltd | Real estate | 2020 |
| Nckg Ltd | Real estate | 2022 |
| NCM International Limited | Construction | 1998 |
| ND Shots Limited | Administrative & support | 2026 |
| NDB Associates Ltd | Professional & scientific | 2025 |
| NDM Auto Care Ltd | Wholesale & retail | 2011 |
| Necimage Limited | Other services | 2022 |
| Negz Ltd | Professional & scientific | 2025 |
| Neil Hawes and Associates Limited | Professional & scientific | 1994 |
| Neil Murdoch Consultancy Limited | Administrative & support | 2010 |
| Neil Twyman Limited | Wholesale & retail | 1989 |
| Neka Investments Ltd | Financial services | 2024 |
| NEO Commerce Services Ltd | Information & communication | 2010 |
| NEO Properties Ltd | Extraterritorial | 2012 |
| Neomed Writing Ltd | Administrative & support | 2021 |
| Neon Tree Ltd | Administrative & support | 2025 |
| Neoteh Management Limited | Other services | 2006 |
| Nepotis Ltd | Wholesale & retail | 2016 |
| Neptune Records Ltd | Information & communication | 2022 |
| Netbar Enterprises Ltd | Professional & scientific | 2014 |
| Network Inc Limited | Professional & scientific | 2022 |
| Network Selects Limited | Financial services | 2002 |
| Neural Innovations Ltd | Information & communication | 2023 |
| Neuronalics Ltd | Information & communication | 2011 |
| Nevek Limited | Administrative & support | 2011 |
| Neville Cleaners Limited | Real estate | 1948 |
| New Crane Wharf Headlease Limited | Real estate | 2005 |
| New Formations Limited | Administrative & support | 2019 |
| New Horizon Health Ltd | Professional & scientific | 2022 |
| New Hour Ltd | Information & communication | 2022 |
| New York Vintage Company Limited | Wholesale & retail | 2011 |
| Newingstoke Limited | Real estate | 2020 |
| Newland Construction Limited | Construction | 1991 |
| Newland Investors Limited | Real estate | 2018 |
| Newsline Limited | Wholesale & retail | 2010 |
| Newspec Build Ltd | Construction | 2026 |
| Newtown Holdings Limited | Real estate | 2022 |
| Newurban Limited | Wholesale & retail | 2001 |
| Nexa Connect Healthcare Ltd | Health & social care | 2026 |
| Nexatra Ltd | Information & communication | 2025 |
| Nexbase Limited | Construction | 2013 |
| Nexgen Creative Limited | Professional & scientific | 2024 |
| Nexsa Limited | Real estate | 2018 |
| Nexstore Limited | Transport & logistics | 2012 |
| Next GEN Fitness Ltd | Arts & recreation | 2014 |
| Next Kick Academy Ltd | Education | 2026 |
| Nexus Estates London Limited | Real estate | 2024 |
| NGS Ventures Limited | Administrative & support | 2020 |
| NH Associates Limited | Professional & scientific | 2016 |
| Niall Cropper Sound Ltd | Information & communication | 2018 |
| Nialto Services Limited | Information & communication | 2018 |
| Nice Carpet & Services Ltd | Administrative & support | 2023 |
| Nicesection Residents Management Limited | Households | 1987 |
| Nicholas Tech Solutions Limited | Information & communication | 2025 |
| Nicky Kendall Ltd | Administrative & support | 2025 |
| Nicolas Macris Limited | Professional & scientific | 2020 |
| Nidama Ltd | Real estate | 2024 |
| Nigel Rose Ltd | Administrative & support | 1981 |
| Niko.Electrical Solutions Ltd | Construction | 2025 |
| Nimble Armadillo Limited | Information & communication | 2022 |
| Nineteen SIX Limited | Information & communication | 2021 |
| Ninety Degree Stewardship Ltd | Real estate | 2019 |
| Ninos Performance Limited | Wholesale & retail | 2026 |
| Nipa Holdings Limited | Other services | 2025 |
| Nirvaan Fields Limited | Financial services | 2020 |
| Nlpcsolutions Ltd | Information & communication | 2024 |
| NMH Solicitors Ltd | Professional & scientific | 2015 |
| NO 1 Wetherby Gardens Limited | Households | 1960 |
| NO' 6 Cafe Limited | Hospitality | 2025 |
| NO. 42 Properties Ltd | Real estate | 2024 |
| Nomolos Investments Limited | Administrative & support | 2021 |
| Norbury Deli Limited | Real estate | 2013 |
| Norfolk Care Homes Ltd | Health & social care | 2014 |
| Noricum Trading | | 1998 |
| North Coast Contractors Ltd | Construction | 2023 |
| North Internet Limited | Information & communication | 2018 |
| North London Counselling Ltd | Extraterritorial | 2014 |