| Mzed Studio Limited | Information & communication | 2024 |
| MÔR Discovery Ltd | Professional & scientific | 2023 |
| MÔR Dog Ltd | Manufacturing | 2021 |
| MÔR Ladron Spirits Ltd | Manufacturing | 2020 |
| MÔR Moments Limited | Professional & scientific | 2025 |
| N & N Contractors Ltd | Construction | 2015 |
| N and G Fabb Limited | Real estate | 1996 |
| N Bowden Limited | Construction | 2021 |
| N Cursio Lettings Ltd | Real estate | 2018 |
| N D John Wine Merchants Limited | Wholesale & retail | 2000 |
| N R Bacon Limited | Professional & scientific | 2008 |
| N V Hair Studios Limited | Other services | 2009 |
| N&F Ltd | Wholesale & retail | 2026 |
| N&G Building & Roofing Services Ltd | Construction | 2026 |
| N.A.D Plumbing Limited | Construction | 2015 |
| N2D Consultancy Limited | Wholesale & retail | 2025 |
| N2N Services Ltd | Transport & logistics | 2020 |
| NA Duenas Project Management Services Ltd | Construction | 2011 |
| NA Living Ltd | Real estate | 2025 |
| Naagaa Convenience Limited | Wholesale & retail | 2019 |
| Naamec Limited | Construction | 2000 |
| Nabelsi UK Trading Ltd | Transport & logistics | 2019 |
| Nabil & Nabil Limited | Real estate | 2017 |
| Nadim Building Ltd | Construction | 2022 |
| Nadora Wellness Ltd | Health & social care | 2021 |
| NAEKAK732 Ltd | Health & social care | 2024 |
| NAG Property Services Ltd | Construction | 2018 |
| Nahmii Limited | Health & social care | 2004 |
| Nail Vanity Ltd | Other services | 2025 |
| Nails & Lashes Ltd | Other services | 2025 |
| Nails on Ltd | Other services | 2012 |
| Naim Takeaway Limited | Hospitality | 2015 |
| Naissance Estates LLP | | 2020 |
| NAJ Barber Ltd | Other services | 2024 |
| Nakama Games Ltd | Information & communication | 2023 |
| Nakoncosmetics Ltd | Wholesale & retail | 2017 |
| Nala's Shop Ltd | Manufacturing | 2024 |
| Nali Building & Construction Limited | Construction | 2025 |
| Nali Properties SA2 Ltd | Real estate | 2025 |
| Namawas Ltd | Transport & logistics | 2019 |
| Nanobiomatrix Ltd | Information & communication | 2016 |
| Nanoglow Ltd | Professional & scientific | 2023 |
| Nanrose Retail Ltd | Wholesale & retail | 2020 |
| Nantvero Limited | Wholesale & retail | 2025 |
| Narc Survivor Ltd | Information & communication | 2021 |
| Nartech Limited | Professional & scientific | 2011 |
| Nartech-Dx Limited | Extraterritorial | 2022 |
| Nartech-Os Limited | Wholesale & retail | 2023 |
| Nas-Architect Ltd | Construction | 2016 |
| Nasarp Company Limited | Wholesale & retail | 2019 |
| Natec Electrical Solutions Limited | Construction | 2013 |
| Nathan Jones Property Ltd | Real estate | 2017 |
| National Children’S Awards Ltd | Administrative & support | 2020 |
| National Market Limited | Wholesale & retail | 2025 |
| Nationwide Insurance Services (Inc. Peter J Maimone Insurance Services EST. 1976) Ltd | Administrative & support | 2004 |
| Natspa Ltd | Wholesale & retail | 2024 |
| Natural Computing Applications Forum | Other services | 1993 |
| Natural Element Global Ltd | Wholesale & retail | 2023 |
| Natural Stone & Tile Company Ltd | Construction | 2013 |
| Naturalistic Products Ltd | Wholesale & retail | 2018 |
| Nava Aesthetics by Steph Ltd | Other services | 2024 |
| Navagrace Limited | Health & social care | 2011 |
| Navigator Yachting Limited | Transport & logistics | 2004 |
| Nayana Limited | Real estate | 2023 |
| Nazmel Ltd | Hospitality | 2019 |
| NB Design Limited | Professional & scientific | 2000 |
| NB Living Ltd | Real estate | 2026 |
| Nbty (2015) Limited | Professional & scientific | 2015 |
| NCA Homes Limited | Real estate | 2023 |
| NCB Ventures Ltd | Construction | 2020 |
| NCW Bikes Limited | Wholesale & retail | 2025 |
| ND John Wine Limited | Extraterritorial | 2011 |
| NDW Electrical Services Ltd | Construction | 2015 |
| NE10 Vodka Ltd | Administrative & support | 2021 |
| Neagle & SON Scaffolding Ltd | Construction | 2019 |
| Near the Pier Limited | Hospitality | 2024 |
| Nearside Productions Ltd. | Arts & recreation | 2017 |
| Neary Metal Limited | Wholesale & retail | 2022 |
| Neat Housing Limited | Real estate | 2022 |
| Neath & Tennant Canals Trust Limited | Health & social care | 1977 |
| Neath Abbey Freight Services Limited | Transport & logistics | 1992 |
| Neath Abbey Land Ltd | Real estate | 2025 |
| Neath Abbey Wharf Ltd | Real estate | 2025 |
| Neath Car Sales Ltd | Wholesale & retail | 2025 |
| Neath Developments SPV 1 Ltd | Construction | 2019 |
| Neath Garage,Transport and Haulage Company,Limited | Real estate | 1919 |
| Neath Port Properties Limited | Real estate | 2024 |
| Neath Port Talbot (Recycling) Limited | Water & waste | 1998 |
| Neath Port Talbot Shopmobility Limited | Other services | 1997 |
| Neath Port Talbot Waste Management Co. Ltd. | Water & waste | 1991 |
| Neath Taxis Ltd | Transport & logistics | 2012 |
| NEATH24/7 Ltd | Transport & logistics | 2023 |
| Neatmast Limited | | 1984 |
| Neatswitch Limited | Construction | 2001 |
| Nebulon Solutions Ltd | Administrative & support | 2025 |
| Necrews Developments Ltd | Financial services | 2023 |
| NED Transport Solutions Ltd | Transport & logistics | 2025 |
| Need a Will Ltd | Professional & scientific | 2025 |
| Neeow Ltd | Financial services | 2024 |
| Neezo Ltd | Wholesale & retail | 2020 |