| Nasief PAY Ltd | Information & communication | 2025 |
| Naski-Grp Ltd | Administrative & support | 2018 |
| Nasrin Akhtar Retail Ltd | Wholesale & retail | 2025 |
| Nass Building Company Limited | Construction | 2019 |
| Nassengineering LLP | | 2025 |
| Nassolutioning Ltd | Information & communication | 2025 |
| Nastasa Transport Ltd | Construction | 2019 |
| Nasy Limited | Hospitality | 2015 |
| Nata Media Ltd | Information & communication | 2020 |
| Natalia Urbanska Ltd | Education | 2023 |
| Natel Evermore Ltd | Professional & scientific | 2025 |
| Nathan Evans Limited | Professional & scientific | 2009 |
| Nathan Garland Ltd | Wholesale & retail | 2025 |
| Nathan Smith Tree Surgery Ltd | Other services | 2018 |
| Nathan the Property Expert Ltd | Real estate | 2021 |
| Nathan Travel Ltd | Administrative & support | 2013 |
| Nathan Wyatt Ltd | Wholesale & retail | 2025 |
| Natim Comp Ltd | Other services | 2020 |
| Natineing Ltd | Wholesale & retail | 2025 |
| Nation Brothers Limited | Construction | 2004 |
| Nation Fitness Ltd | Arts & recreation | 2019 |
| Nation Society Builders Ltd | Education | 2025 |
| Nation Sports Ltd. | Arts & recreation | 2017 |
| Nation Trans Service Ltd | Transport & logistics | 2024 |
| National Beauty Distribution UK Limited | Wholesale & retail | 2022 |
| National Coach Holidays Limited | Transport & logistics | 2020 |
| National Company Rescue Ltd | Administrative & support | 2019 |
| National Corporates Ltd | Other services | 2015 |
| National Dance Company Wales | Arts & recreation | 1982 |
| National Design Ltd | Other services | 2021 |
| National Direct Service Ltd | Professional & scientific | 2017 |
| National Engraver Ltd | Wholesale & retail | 2014 |
| National Fostering Agency (Wales) CIC | Health & social care | 2026 |
| National Health Tech Limited | Professional & scientific | 2019 |
| National Industrial Supplies Ltd | Administrative & support | 2025 |
| National Insecurities Limited | Information & communication | 2018 |
| National Screeding Ltd | Construction | 2021 |
| National Technology Consortium Ltd | Information & communication | 2024 |
| National Vehicle Services Ltd | Wholesale & retail | 2018 |
| National Youth Arts Wales | Arts & recreation | 2016 |
| Nationwide Drains and Water Solutions Ltd | Administrative & support | 2019 |
| Nationwide Drops Ltd | Transport & logistics | 2023 |
| Nationwide Financial Assistance Ltd | Financial services | 2017 |
| Nationwide Insulation Contracts Ltd | Construction | 2023 |
| Nationwide Retrofit Ltd | Construction | 2014 |
| Nationwide Site Solutions Ltd | Administrative & support | 2015 |
| Nationwide Support Services Limited | Extraterritorial | 2010 |
| Nationwide Vehicle Rentals Group Ltd | Administrative & support | 2019 |
| Nationwide Vehicle Transporters Ltd | Transport & logistics | 2020 |
| Native Fragrance Ltd | Manufacturing | 2019 |
| Native Property Developments Ltd | Real estate | 2024 |
| Native Property Freeholds Ltd | Real estate | 2024 |
| Native Property Holdings Ltd | Financial services | 2024 |
| Native Property Investing Ltd | Real estate | 2024 |
| Native Radio CIC | Information & communication | 2025 |
| Natramon Ltd | Wholesale & retail | 2025 |
| Natstore Limited | Wholesale & retail | 2016 |
| Natulifri | Professional & scientific | 2025 |
| Natum Care Ltd | Wholesale & retail | 2024 |
| Natur Eco Ltd | Professional & scientific | 2020 |
| Natura Blanc Ltd | Wholesale & retail | 2025 |
| Natural BIO Kimchi Ltd | Hospitality | 2022 |
| Natural Family Planning Teachers Association | Education | 2000 |
| Natural Food Ingredients Ltd | Professional & scientific | 2004 |
| Natural Foods Direct (2000) Ltd | Wholesale & retail | 2001 |
| Natural Given Talent Limited | Arts & recreation | 2018 |
| Natural Health Goods Ltd | Wholesale & retail | 2018 |
| Natural Obsession and Sensuality Ltd | Wholesale & retail | 2020 |
| Natural Pet Food Supplies UK Ltd | Wholesale & retail | 2022 |
| Natural Product Europe Limited | Health & social care | 2009 |
| Natural Reaction Ltd | Extraterritorial | 2012 |
| Natural Reliance Ltd | Manufacturing | 2017 |
| Natural Return Ltd | Professional & scientific | 2023 |
| Natural Selection Electrics Ltd | Construction | 2024 |
| Natural Spice HFD Ltd | Hospitality | 2024 |
| Natural Taste Heaven Ltd | Manufacturing | 2024 |
| Naturally Perfect Ltd | Wholesale & retail | 2019 |
| Naturally Seven Ltd. | Real estate | 2012 |
| Naturalz (UK) Limited | Wholesale & retail | 2019 |
| Naturamemo Decor Ltd | Wholesale & retail | 2025 |
| Nature and ME Ltd | Wholesale & retail | 2020 |
| Nature B Limited | Manufacturing | 2017 |
| Nature's Back Ltd | Manufacturing | 2019 |
| Nature's Treat Ltd | Wholesale & retail | 2018 |
| Naturecare Ltd | Administrative & support | 2019 |
| Naturedrifter Ltd | Wholesale & retail | 2025 |
| Naturenesthandmade Ltd | Wholesale & retail | 2025 |
| Naturespure Health Products UK Ltd | Wholesale & retail | 2020 |
| Naturessolutioncbd Ltd | Wholesale & retail | 2019 |
| Natv Coffee Ltd | Hospitality | 2025 |
| Naughty Pixel Ltd | Information & communication | 2018 |
| Naunton Jones LE Masurier Limited | Professional & scientific | 2023 |
| Naup Ltd | Construction | 2025 |
| Nautical Blue Swing Limited | Agriculture & fishing | 2025 |
| Nautilus GIN Foundry Ltd | Manufacturing | 2016 |
| Nava Pind Ltd | Wholesale & retail | 2025 |
| Nava Talent Limited | Administrative & support | 2024 |
| Navabhi Ltd | Administrative & support | 2022 |
| Navarro Financial Consultancy Services Ltd | Financial services | 2016 |
| Navasquillo FUN Ltd | Information & communication | 2025 |