| Natforwords Limited | Administrative & support | 2014 |
| Nath Dalton Barbering Ltd | Other services | 2020 |
| Nathan Dring and Associates Limited | Professional & scientific | 2023 |
| Nathan Parks Ltd | Information & communication | 2017 |
| Nation Property Group Development Ltd | Real estate | 2023 |
| Nation Property Group Ltd | Real estate | 2019 |
| National Car Boot Sales Limited | Wholesale & retail | 2011 |
| National Car Parks Group Limited | Professional & scientific | 1998 |
| National Car Parks Limited | Transport & logistics | 1931 |
| National Centre for Diversity Ltd | Professional & scientific | 2005 |
| National Coaching Foundation(The) | Arts & recreation | 1987 |
| National Endurance Centre Limited | Arts & recreation | 2016 |
| National Energy Advice Bureau Limited | Other services | 2019 |
| National Groundworks Limited | Construction | 2018 |
| National OIL Services Limited | Water & waste | 2024 |
| National Parking Corporation Limited | Professional & scientific | 1973 |
| National Poetry Centre Ltd | Arts & recreation | 2021 |
| National Quick Courier Limited | Transport & logistics | 2020 |
| National Series of Boxing Ltd | Arts & recreation | 2016 |
| National Shutters & Security Specialists Ltd | Manufacturing | 2022 |
| National Storage Solutions Ltd | Transport & logistics | 2021 |
| National Testing Solutions Ltd | Professional & scientific | 2026 |
| National Tiles (Leeds) Ltd | Construction | 2019 |
| National Tiles Limited | Construction | 2018 |
| National Wealth Fund Limited | Financial services | 2009 |
| Nationwide Composite Doors Ltd | Wholesale & retail | 2025 |
| Nationwide Construction Agency Ltd | Administrative & support | 2025 |
| Nationwide Decorators & Sprayfinishing Limited | Construction | 2015 |
| Nationwide Doors Direct Limited | Wholesale & retail | 2015 |
| Nationwide Dual Controls Limited | Wholesale & retail | 2012 |
| Nationwide Office Supplies Limited | Administrative & support | 2013 |
| Nationwide Renewables Ltd | Energy | 2016 |
| Nationwide Road Movers Limited | Transport & logistics | 2022 |
| Nationwide Safety Management Ltd | Construction | 2017 |
| Nationwide Security Solutions Limited | Administrative & support | 2018 |
| Nationwide Valeting Limited | | 2001 |
| Nativo Limited | Information & communication | 2005 |
| Natmabel Healthcare Ltd | Health & social care | 2025 |
| Natmac (Armley) LLP | | 2008 |
| Natmac (Horsforth) LLP | | 2008 |
| Natpadthai Restaurant Ltd | Hospitality | 2019 |
| Natrum Ltd | Wholesale & retail | 2023 |
| Natur-All Limited | Wholesale & retail | 2018 |
| Natura Colour and Polymer Research Ltd | Professional & scientific | 2022 |
| Natural GAS Services (Training) Limited | Education | 1999 |
| Natural Inrod International UK Ltd | Other services | 2021 |
| Natural NOW Ltd | Wholesale & retail | 2017 |
| Natural Pearl Consultancy & Services Ltd | Information & communication | 2024 |
| Natural Stone (Leeds) Limited | Wholesale & retail | 2011 |
| Natural Stone Cladding UK Ltd | Manufacturing | 2024 |
| Naturally Special Ltd | Professional & scientific | 2021 |
| Nature Asset Management Ltd | Financial services | 2024 |
| Natureinks Limited | Wholesale & retail | 2012 |
| Natureon Ltd | Manufacturing | 2025 |
| Naturise Ltd | Professional & scientific | 2020 |
| Natz Services Ltd | Construction | 2025 |
| Naul Corporates Ltd | Administrative & support | 2025 |
| Nauluigh Limited | Financial services | 2008 |
| NAV Walker Talent Acquisition Ltd | Administrative & support | 2025 |
| Navangad Ltd | Transport & logistics | 2026 |
| Navi Technologies Limited | Information & communication | 2024 |
| Navids Technology Holdings Limited | Financial services | 2025 |
| Navigation Agency Ltd | Professional & scientific | 2022 |
| Navigation Court Limited | Real estate | 2010 |
| Navigation Point Management Limited | Households | 2012 |
| Navigatr Limited | Information & communication | 2019 |
| Navigliox Limited | Information & communication | 2025 |
| Navigova Limited | Information & communication | 2025 |
| Navillus Medical Ltd | Health & social care | 2024 |
| Navireon Ltd | Wholesale & retail | 2026 |
| Navjivna Homes Ltd | Real estate | 2020 |
| Navonicare Limited | Health & social care | 2022 |
| Navotech Group Limited | Information & communication | 2025 |
| Navs Couriers Ltd | Transport & logistics | 2025 |
| Navtej Hunjan Ltd | Health & social care | 2024 |
| Nawaab Catering Ltd | Hospitality | 2025 |
| Nawaab Restaurant Ltd | Hospitality | 2024 |
| Nawab Investment Holdings Limited | Real estate | 2026 |
| Nawal for Training and Consulting Ltd | Education | 2025 |
| Nawaz Events Catering Limited | Hospitality | 2020 |
| Nawaz Logistical Ltd | Transport & logistics | 2025 |
| Nawras Foods Ltd | Wholesale & retail | 2017 |
| Nawroz 231 Ltd | Other services | 2025 |
| Nayab and Sana Ltd | Health & social care | 2014 |
| Nayana Consulting Ltd | Information & communication | 2019 |
| Naylor Propco Ltd | Real estate | 2020 |
| Naylor Technology Limited | Information & communication | 2025 |
| Naylors Limited | Wholesale & retail | 1997 |
| Naysa Health Care Limited | Public administration | 2025 |
| Nazli Labs Ltd | Information & communication | 2015 |
| Nazmas Pizzas and Pancake HUT Ltd | Hospitality | 2024 |
| NB Pokestop Limited | Wholesale & retail | 2025 |
| NB Security Services Ltd | Administrative & support | 2022 |
| NB Technology Services Limited | Financial services | 2015 |
| Nbakery Co Ltd | Manufacturing | 2025 |
| Nbandi Limited | Real estate | 2014 |
| Nbbm Medical Limited | Health & social care | 2026 |
| NBC Group Holdings Ltd | Real estate | 2018 |
| NBK Infrastructure Limited | Construction | 2026 |
| NBP Group Limited | Construction | 2021 |