| NA Essentials Ltd | Wholesale & retail | 2024 |
| NA Global Ventures Limited | Wholesale & retail | 2025 |
| Naagin London Ltd | Wholesale & retail | 2021 |
| Naala Ltd | Wholesale & retail | 2025 |
| Naar UK Ltd | Wholesale & retail | 2018 |
| Naari Ventures Limited | Hospitality | 2022 |
| Nabeel Civil Engineering Ltd | Construction | 2023 |
| Nachy Burgers Limited | Hospitality | 2025 |
| NAG Metals & Technologies Ltd | Wholesale & retail | 2019 |
| Nagle & Co Property Limited | Real estate | 2020 |
| Nahenniker Limited | Real estate | 2023 |
| Nahila Properties Limited | Real estate | 2024 |
| Naija House of Flavors Limited | Hospitality | 2025 |
| Naijaachops Ltd | Wholesale & retail | 2020 |
| Najim Child Disability | Health & social care | 2020 |
| Najs Investments | Financial services | 2023 |
| Nakba Ltd | Wholesale & retail | 2025 |
| Naked Noise Limited | Information & communication | 2013 |
| Nakimuli Limited | Health & social care | 2023 |
| Nakwam Recruitment and Valeting Ltd | Administrative & support | 2025 |
| Nala Property Group Limited | Real estate | 2025 |
| Nalita Transport and Logistics Ltd | Mining & quarrying | 2023 |
| Nalua Skin Ltd | Wholesale & retail | 2023 |
| Namaskar Consultancies Ltd | Information & communication | 2019 |
| Namaskar Investments Ltd | Real estate | 2020 |
| Namtech Solutions Limited | Information & communication | 2017 |
| Namu Beauty Limited | Wholesale & retail | 2025 |
| Nanah’S Hair Lair Ltd | Other services | 2025 |
| Nandiza Properties Ltd | Real estate | 2023 |
| Nandu Limited | Wholesale & retail | 2019 |
| Nangiana Ltd | Wholesale & retail | 2023 |
| Nankeep Ltd | Administrative & support | 2020 |
| Nannyplus Household Staff Limited | Administrative & support | 2019 |
| Nano Nurture Ltd | Health & social care | 2025 |
| Nano Particles Ltd | Professional & scientific | 2010 |
| Nanoifp Ltd | Other services | 2023 |
| Nanomater Consultants Ltd | Professional & scientific | 2015 |
| Nanovai Ltd | Health & social care | 2025 |
| Nanshy Limited | Wholesale & retail | 2012 |
| Nanudanu Ltd | Construction | 2020 |
| Nanzedube Ltd | Health & social care | 2015 |
| Naolyte Ltd | Manufacturing | 2025 |
| Naomi Scott Design Ltd | Other services | 2011 |
| Napier Parking Limited | Transport & logistics | 2006 |
| Napier Racing Limited | Professional & scientific | 2014 |
| Naprous Ltd | Administrative & support | 2021 |
| NAQ Limited | Construction | 2017 |
| Nara Properties Ltd | Real estate | 2020 |
| Narayana Limited | Hospitality | 2024 |
| Narkar Consultancy Ltd | Information & communication | 2023 |
| Narmada Enterprise Ltd | Information & communication | 2019 |
| Narrative Media Limited | Information & communication | 2016 |
| Narrow Healthcare Ltd | Health & social care | 2024 |
| Narsrej Limited | Health & social care | 2023 |
| NAS Bags Ltd | Wholesale & retail | 2026 |
| Nasa UMB Ltd | Administrative & support | 2016 |
| Nasalt Limited | Real estate | 1979 |
| Nasd Consulting Limited | Other services | 2012 |
| Nash Educational Services Limited | Education | 2007 |
| Nash Estate Agents Group Limited | Financial services | 2025 |
| Nash Heating Services Limited | Construction | 2020 |
| Nash Homes Ltd | Real estate | 2019 |
| Nash Ridings Management Company Limited | Households | 2015 |
| Nashe Logistics Limited | Transport & logistics | 2024 |
| Nashil Automotive Engineers Limited | Wholesale & retail | 2000 |
| Nashrose (Record Shop) Limited | Other services | 1987 |
| Nastigan Limited | Construction | 2026 |
| Nasvegas Services Limited | Administrative & support | 2017 |
| Nasz Sklep MK Ltd | Wholesale & retail | 2021 |
| Natalie Finch Limited | Professional & scientific | 2018 |
| Natalie Joseph Hypnotherapy Limited | Health & social care | 2021 |
| Natam Global Ltd | Transport & logistics | 2018 |
| Natex Holdings Limited | Financial services | 2024 |
| Natex UK Limited | Manufacturing | 2000 |
| Natexx Ltd | Transport & logistics | 2018 |
| Nathan & Chloe Ltd | Construction | 2023 |
| Nathan Grace Ltd | Professional & scientific | 2017 |
| Nathan James Ltd | Wholesale & retail | 2016 |
| Nathan Media Ltd | Arts & recreation | 2025 |
| Nathaniel & Partners Ltd | Financial services | 2018 |
| Nathi IT Consulting Services Ltd. | Information & communication | 2015 |
| Nathwani Consulting Limited | Information & communication | 2011 |
| Nation Feeders Ltd | Hospitality | 2015 |
| National Building & Construction Awards Ltd | Professional & scientific | 2025 |
| National Film and Sci-Fi Museum Limited | Arts & recreation | 2020 |
| National Film and Sci-Fi Museum Trading Limited | Arts & recreation | 2020 |
| National House-Building Council | Financial services | 1936 |
| National Locums Ltd | Administrative & support | 2009 |
| National Property Partners Ltd | Construction | 2024 |
| National Safety Inspections Ltd | Construction | 2017 |
| National Salvage Limited | Wholesale & retail | 2026 |
| National Truck and Trailer Sales Limited | Professional & scientific | 1937 |
| Nationwide Recycling Services (UK) Ltd | Water & waste | 2013 |
| Nationwide Security Plus Ltd | Administrative & support | 2016 |
| Natkany Ltd | Transport & logistics | 2021 |
| Natlustech Ltd | Information & communication | 2019 |
| Natural Eyebrows Ltd | Other services | 2021 |
| Natural I AM Ltd | Other services | 2018 |
| Natural Nibbles Pastries Ltd | Manufacturing | 2025 |
| Natural Source Waters Association Limited | Professional & scientific | 2008 |