| Nicole Shorey Ltd | Health & social care | 2011 |
| Nicoleta Sparkles Ltd | Administrative & support | 2025 |
| Niels Bellinger Productions Limited | Arts & recreation | 2002 |
| Nigel Dorning Associates Limited | Professional & scientific | 2018 |
| Nightingale Global Co., Ltd. | Extraterritorial | 2018 |
| Nightingale Quarter Apart-Hotel Limited | Construction | 2012 |
| Nightingale Training and Consultancy Services Limited | Education | 2021 |
| Nigma Health Limited | Professional & scientific | 2018 |
| Nikolli Builders Ltd | Construction | 2020 |
| Nimble Communications Ltd | Professional & scientific | 2018 |
| Nimbus Ltd | Real estate | 1981 |
| Nine Heads PUB Co. Ltd | Hospitality | 2023 |
| Nine White Deer Consulting Ltd | Professional & scientific | 2026 |
| Nineteen the Mall Management Company Limited | Households | 1987 |
| Ningaloo Consulting Ltd | Information & communication | 2010 |
| Ninski Limited | Other services | 2016 |
| Niraj Alok Ltd | Information & communication | 2021 |
| Nirmal Medical Limited | Health & social care | 2014 |
| Nish Infotech Ltd | Information & communication | 2017 |
| Nixon Media Ltd | Information & communication | 2018 |
| NJS (Electrical Services) Limited | Construction | 2002 |
| NKH Business Services Limited | Professional & scientific | 2019 |
| NM Fulfilment Limited | Wholesale & retail | 2023 |
| NM Maths and Science Ltd | Education | 2026 |
| NMD Accountants Ltd | Professional & scientific | 2023 |
| NN Roofing Contractors Limited | Other services | 2012 |
| NNC M&E Limited | Real estate | 2013 |
| NO 13 Freelands Limited | Households | 2017 |
| NO Comment Gallery Limited | Wholesale & retail | 2025 |
| NO Limit Cycling Club Ltd | Arts & recreation | 2023 |
| NO Wahala Limited | Information & communication | 2023 |
| Noble House RTM Company Limited | Households | 2018 |
| Noble PM Limited | Construction | 2014 |
| Noblecopy Limited | Wholesale & retail | 1991 |
| Noctilucent Ltd | Wholesale & retail | 2021 |
| Noesis Business Solutions Limited | Information & communication | 2026 |
| Noesis Infotech Limited | Real estate | 2020 |
| Noesis Investments Limited | Real estate | 2026 |
| Noha Smith Services Ltd | Real estate | 2010 |
| Noisyspace Limited | Professional & scientific | 2006 |
| Nokomis Limited | Extraterritorial | 2023 |
| Nolab Ltd | Hospitality | 2023 |
| Nolan's Thai Boxing and Fitness Ltd | Arts & recreation | 2020 |
| Nomad Trackdays Ltd | Hospitality | 2025 |
| Nomert Facilities Management Ltd | Administrative & support | 2024 |
| Nonet House RTM Company Limited | Households | 2022 |
| Noones Autos Limited | Administrative & support | 2025 |
| Noor Capital Holdings Ltd | Financial services | 2026 |
| Noor Property Investment Group Ltd | Real estate | 2026 |
| Noori Trading Ltd | Wholesale & retail | 2024 |
| Noorthstar Ltd | Administrative & support | 2019 |
| Norack Ltd | Real estate | 2025 |
| Norbury Avenue RTM Company Ltd | Households | 2018 |
| Norcal Engineering Limited | Extraterritorial | 2013 |
| Nordic Jeweller Ltd | Wholesale & retail | 2025 |
| Nordkapp International Limited | Professional & scientific | 2024 |
| Norindil Ltd | Information & communication | 2024 |
| Norlux Electrical Ltd | Construction | 2024 |
| Norlux Properties Ltd | Construction | 2024 |
| Norm Yachting Ltd | Extraterritorial | 2024 |
| Norman Park Track Management Limited | Arts & recreation | 1992 |
| Normans Butchers Limited | Wholesale & retail | 2007 |
| North Court Management Limited | Households | 2001 |
| North East and Teesside Limited | Real estate | 2022 |
| North Lodge Property Management Limited | Real estate | 2025 |
| North London Training Trust Limited | Other services | 1994 |
| North Road B Ltd | Real estate | 2021 |
| North South Design Ltd | Information & communication | 2016 |
| North Star (2000) Limited | Construction | 1997 |
| Northill House (London) Freehold Company Limited | Households | 2022 |
| Northill House (London) RTM Company Limited | Real estate | 2020 |
| Northlands (Bromley) RTM Company Limited | Real estate | 2020 |
| Northleach Property Management Limited | Real estate | 2022 |
| Northstone Ventures Limited | Wholesale & retail | 2025 |
| Norton House Property Investments Limited | Real estate | 2021 |
| NOS Software Solutions Limited | Information & communication | 2019 |
| NOT Waste C.I.C. | Professional & scientific | 2018 |
| NOT Waste Milverton CIC | Water & waste | 2020 |
| Notches London Limited | Professional & scientific | 2019 |
| Nothe Kellaway Limited | Hospitality | 2023 |
| Notice Period Limited | Wholesale & retail | 2014 |
| Nour Advisory Limited | Professional & scientific | 2023 |
| Nouryx Group Ltd | Wholesale & retail | 2026 |
| Nova Bioelectrics Limited | Professional & scientific | 2020 |
| Nova Chapter Limited | Financial services | 2026 |
| Nova Secretarial Services Ltd | Administrative & support | 2025 |
| Novacapvt Ltd | Wholesale & retail | 2025 |
| Novafori Ltd. | Information & communication | 2011 |
| Novaris London Limited | Professional & scientific | 2025 |
| Novellus Capital Limited | Professional & scientific | 2013 |
| Novellus Limited | Financial services | 2017 |
| Novellus Property Limited | Real estate | 2024 |
| Novia House Management Company Limited | Households | 2013 |
| Nowexalted Limited | Information & communication | 2025 |
| NOX Solutions Group Ltd | Construction | 2023 |
| NOY Properties Limited | Real estate | 2023 |
| NPJ Service Limited | Real estate | 2025 |
| Npm-Uk Ltd | Real estate | 2021 |
| NR Link Consultancy Ltd | Professional & scientific | 2023 |
| NR1 Limited | Health & social care | 2024 |