| National Museum Directors' Council | Arts & recreation | 2025 |
| National Places LLP | | 2020 |
| National Refrigerants Ltd | Manufacturing | 1988 |
| National Refrigerants of America Ltd | Professional & scientific | 2008 |
| National Repairs Limited | Wholesale & retail | 2025 |
| National Utilities Ltd | Construction | 2016 |
| National Vehicle Logistics Ltd | Wholesale & retail | 2025 |
| Nationalmakeupawards Ltd | Wholesale & retail | 2019 |
| Nationwide Asbestos Management Limited | Administrative & support | 2014 |
| Nationwide Asset Holdings Ltd | Administrative & support | 2024 |
| Nationwide Car Sales UK Ltd | Wholesale & retail | 2012 |
| Nationwide Catering Ltd | Wholesale & retail | 2020 |
| Nationwide Consumer Consultants Limited | Administrative & support | 2016 |
| Nationwide Corporation Group Limited | Financial services | 2019 |
| Nationwide Facilities Services Limited | Administrative & support | 2019 |
| Nationwide Fencing Services Ltd | Construction | 2011 |
| Nationwide Fencing Supplies Ltd | Manufacturing | 2018 |
| Nationwide Film Location Services Limited | Administrative & support | 2020 |
| Nationwide Joinery NW Ltd | Construction | 2019 |
| Nationwide Management Solutions Limited | Administrative & support | 2023 |
| Nationwide Management Systems Limited | Administrative & support | 2023 |
| Nationwide Motor Sales Ltd | Wholesale & retail | 2022 |
| Nationwide SET Lighting Ltd | Information & communication | 2022 |
| Nationwide Sureties Limited | Financial services | 1999 |
| Nativeland Food Ltd | Wholesale & retail | 2026 |
| Natnolan Group Ltd | Wholesale & retail | 2020 |
| Natsam Ltd | Hospitality | 2026 |
| Natt Property Limited | Real estate | 2023 |
| Nattem Ltd | Professional & scientific | 2021 |
| Natterjack Consulting Ltd | Professional & scientific | 2025 |
| Natterjack Limited | Wholesale & retail | 2024 |
| NATUR4L Fresh Food Ltd | Wholesale & retail | 2025 |
| Natural Blush Limited | Education | 2022 |
| Natural Breaks Limited | Health & social care | 1994 |
| Natural Careers Care Ltd | Health & social care | 2024 |
| Natural Distinction Ltd | Professional & scientific | 2019 |
| Natural Folk Limited | Manufacturing | 2009 |
| Natural Soap Trading Ltd | Wholesale & retail | 2017 |
| Natural Strains Limited | Wholesale & retail | 2019 |
| Naturally Better Brands Ltd. | Administrative & support | 2018 |
| Naturavivauk Ltd | Wholesale & retail | 2022 |
| Nature in Exports & Imports Limited | Wholesale & retail | 2025 |
| Naturefuelcompany Limited | Wholesale & retail | 2025 |
| Naturopathic Nutrition Ltd | Health & social care | 2024 |
| Natutre Kart Ltd | Health & social care | 2024 |
| Naughty BUT Nice Liverpool Limited | Hospitality | 2020 |
| NAV REC Limited | Professional & scientific | 2014 |
| Navi EJ Holdings Limited | Wholesale & retail | 2025 |
| Navida Co. Ltd | Other services | 2025 |
| Navigation Consulting Limited | Information & communication | 2015 |
| Navigation Financial Services Limited | Financial services | 1999 |
| Naviquest Travels Ltd | Administrative & support | 2025 |
| Navir Ltd | Information & communication | 2014 |
| Navis Property Services Ltd | Households | 2025 |
| Navis Taxis Ltd | Transport & logistics | 2025 |
| Navis Transport Ltd | Transport & logistics | 2021 |
| Naxreadle Limited | Professional & scientific | 2016 |
| Nayana Properties Limited | Real estate | 2020 |
| Nayco 4 Limited | Real estate | 2014 |
| Nayeli the Label Ltd | Wholesale & retail | 2026 |
| Nayo News Ltd | Wholesale & retail | 2025 |
| Nayo Retail Ltd | Wholesale & retail | 2024 |
| Nays Brickwork Ltd | Administrative & support | 2026 |
| NAZ Estates Ltd | Real estate | 2024 |
| NAZ for Retail Ltd | Wholesale & retail | 2023 |
| NAZ Grill Liverpool Ltd | Hospitality | 2025 |
| Naz's Food Ltd | Hospitality | 2025 |
| Nazar Digital Creator Ltd | Professional & scientific | 2024 |
| Nazareth Care Services Ltd | Administrative & support | 2025 |
| Nazdar Investment Ltd | Real estate | 2017 |
| Nazeby (C.C.) Management Limited | Households | 1987 |
| Nazene Danielle School of Performing Arts Ltd | Arts & recreation | 2021 |
| Nazim Healthcare Ltd | Health & social care | 2023 |
| Nazs Group Ltd | Wholesale & retail | 2026 |
| NB Legal Services Limited | Professional & scientific | 2023 |
| NB Promotions Ltd | Administrative & support | 2022 |
| NB Properties NW Limited | Real estate | 2025 |
| NB Spmu & Beauty Ltd | Extraterritorial | 2023 |
| NB-19 Ltd | Administrative & support | 2021 |
| NBL Ltd | Professional & scientific | 2022 |
| NBS Consulting Group Ltd | Wholesale & retail | 2024 |
| NBS Ltd | Professional & scientific | 2025 |
| Nbsbm Ltd | Professional & scientific | 2025 |
| NC Developments (NW) Limited | Real estate | 2020 |
| NC Engineering Solutions Limited | Information & communication | 2013 |
| NC Painting & Decorating Ltd | Construction | 2020 |
| NC Product Design Ltd | Professional & scientific | 2026 |
| Ncam Limited | Hospitality | 2020 |
| NCB11 Limited | Financial services | 2022 |
| NCB73 Limited | Financial services | 2022 |
| NCC Construction Ltd | Manufacturing | 2018 |
| NCF Event Group Ltd | Arts & recreation | 2022 |
| NCF Rentals Ltd | Real estate | 2025 |
| NCG Ltd | Professional & scientific | 2019 |
| NCK Construction Limited | Construction | 2014 |
| NCO Global Ltd | Wholesale & retail | 2025 |
| NCS Media Limited | Administrative & support | 2025 |
| NCS Real Estate Consultants Limited | Professional & scientific | 2013 |
| NCS Real Estate Holdings Limited | Financial services | 2020 |
| NCT Solutions Limited | Construction | 2008 |