| N.A.N Installation Lifts UK Ltd | Construction | 2019 |
| N2A Products Limited | Wholesale & retail | 2021 |
| NA Architects Limited | Professional & scientific | 2020 |
| Nabrey Global Limited | Wholesale & retail | 2020 |
| Nahar Corporation Limited | Professional & scientific | 2022 |
| Nahar Solutions Ltd | Information & communication | 2015 |
| Nailedit Mobile Beauty Ltd | Other services | 2017 |
| Nails & Spa ( Tolworth) Limited | Other services | 2023 |
| Naked Property Developments Ltd | Financial services | 2020 |
| Naked Property Penzance Limited | Construction | 2021 |
| Naked Southampton Ltd | Construction | 2021 |
| Nanodome Limited | Information & communication | 2008 |
| Naqvi Immigration Chambers Ltd | Professional & scientific | 2026 |
| NAR Persian Kebab Ltd | Hospitality | 2025 |
| Naraz Industry Limited | Professional & scientific | 2023 |
| NAS Healthcare Solutions Limited | Health & social care | 2012 |
| Natalie Ellen Weddings Ltd | Other services | 2018 |
| Nath Consultancy Ltd | Professional & scientific | 2017 |
| Nationwide Independent Consultants Limited | Financial services | 2012 |
| Natural Medicine Limited | Health & social care | 2019 |
| Naturally Whole Ltd | Manufacturing | 2019 |
| Nature's Answer Limited | Wholesale & retail | 2018 |
| NAY Thai House Limited | Hospitality | 2023 |
| Nayab Traders Ltd | Wholesale & retail | 2019 |
| Nayeb Accountants Ltd | Professional & scientific | 2025 |
| NB Building Services AB Ltd | Construction | 2024 |
| Nbys Tech Ltd | Information & communication | 2023 |
| Ncounter Limited | Information & communication | 2021 |
| ND 2019 Ltd | Other services | 2019 |
| ND YET UK Limited | Health & social care | 2017 |
| Ndbq Services Limited | Construction | 2025 |
| Nedies Media Limited | Administrative & support | 2015 |
| Neeva Wholesale Ltd | Wholesale & retail | 2025 |
| Neighbourhood Property Invest Ltd | Real estate | 2020 |
| Nell Court (Surbiton) Residents Association Limited | Households | 1979 |
| Nelson Food and Wine Ltd | Wholesale & retail | 2019 |
| NEO Transport Planning Ltd | Professional & scientific | 2025 |
| Neolux Consulting Ltd | Professional & scientific | 2021 |
| Nepo World Ltd | Construction | 2025 |
| Nest Construction Limited | Construction | 2018 |
| Netro Systems Limited | Information & communication | 2023 |
| Neurogrid Solutions AI Limited | Information & communication | 2025 |
| Neville House Residents Management Limited | Households | 1975 |
| New Appearance Painting Ltd | Construction | 2020 |
| New ERA Community Projects CIC | Health & social care | 2021 |
| New Khasturi Ltd | Hospitality | 2026 |
| New Malden Theatre Academy LLP | | 2022 |
| New Milano 71 Ltd | Hospitality | 2024 |
| New Surbiton Limited | Hospitality | 2021 |
| New Territories Ltd | Real estate | 2025 |
| New WOO Ltd | Hospitality | 2020 |
| New York Investment Property Limited | Real estate | 2013 |
| Newman-Milone Creative Ltd | Professional & scientific | 2024 |
| Newpoint Management Company Limited | Construction | 2020 |
| Newtega Limited | Professional & scientific | 2025 |
| Nexera Privacy Limited | Other services | 2023 |
| Next Step Property Investments Ltd | Real estate | 2019 |
| Nfinity Global Limited | Wholesale & retail | 2022 |
| NGN Associates Limited | Information & communication | 2012 |
| NH Data Services Ltd | Information & communication | 2017 |
| NHJ2 Ltd | Transport & logistics | 2025 |
| NHR Properties Ltd | Real estate | 2024 |
| Nicholson Kirkwood Ltd | Professional & scientific | 2017 |
| Nick Taylor Mechanical Limited | Construction | 2015 |
| Nida (UK) Ltd | Professional & scientific | 2012 |
| Nightingale Hearing Implants Limited | Wholesale & retail | 2025 |
| Nightingale Protection Ltd | Financial services | 2025 |
| Nightjar Solutions Limited | Professional & scientific | 2015 |
| Nikh Limited | Transport & logistics | 2026 |
| Nikitas Ugly Duckling Properties Ltd | Real estate | 2025 |
| Nikolay Machev Ltd | Construction | 2025 |
| Nine Zero Holdings Limited | Financial services | 2025 |
| Nine Zero Trading Ltd | Wholesale & retail | 2017 |
| Ninja Delivery Limited | Information & communication | 2019 |
| Nion Traders Ltd | Wholesale & retail | 2025 |
| Nipper Alley Ltd | Households | 2023 |
| NJ Food Tech Ltd | Hospitality | 2024 |
| Njala International Limited | Professional & scientific | 2002 |
| Njalo Investments Ltd | Real estate | 2020 |
| NK Associates Ltd | Professional & scientific | 2026 |
| NKV Group Ltd | Information & communication | 2019 |
| NKV Investments Ltd | Construction | 2023 |
| NKV Real Estate Ltd | Financial services | 2026 |
| Nmsm Construction Ltd | Construction | 2020 |
| Nmsm Professionals Ltd | Construction | 2024 |
| NN Capital Ltd | Wholesale & retail | 2016 |
| NNP Fire Ltd | Administrative & support | 2024 |
| Nocturnes Films Ltd | Information & communication | 2022 |
| Noei Lets Ltd | Real estate | 2022 |
| Nogti Nails Ltd | Other services | 2025 |
| Noire Estates Limited | Real estate | 2021 |
| Nola&Co Ltd | Arts & recreation | 2022 |
| Nolan-Harris Limited | Professional & scientific | 2016 |
| Nomadia Gear Ltd | Wholesale & retail | 2025 |
| Nordalis Ltd | Professional & scientific | 2025 |
| North Services Limited | Wholesale & retail | 2022 |
| Northbrook Solutions Limited | Information & communication | 2002 |
| Northway Removal & Storage Ltd | Transport & logistics | 2026 |
| Notibrus Limited | Real estate | 2024 |
| Notifia Software Ltd | Information & communication | 2019 |