| NB Fitting Ltd | Manufacturing | 2023 |
| NB Leads Limited | Information & communication | 2025 |
| Nbsr Limited | Real estate | 2017 |
| NCL Online Ltd | Wholesale & retail | 2020 |
| NCM 15WH Limited | Construction | 2024 |
| NCM Group Ltd | Construction | 2024 |
| ND Optical Ltd | Financial services | 2019 |
| NDP Real Estate Limited | Real estate | 2019 |
| NDW Advisory Limited | Professional & scientific | 2015 |
| Ne@T Ltd | Other services | 2022 |
| Near OR FAR Limited | Wholesale & retail | 1986 |
| Neasden Property Holdings Limited | Financial services | 2021 |
| Neat Communications Limited | Professional & scientific | 2002 |
| Nebst Ltd | Construction | 2008 |
| Nebulus Holdings Ltd | Construction | 2026 |
| Necessitas Limited | Administrative & support | 2009 |
| Neeta Catering Ltd | Manufacturing | 2018 |
| Neevshiv Properties Limited | Real estate | 2022 |
| Neeyati Properties Ltd | Real estate | 2018 |
| Neil Reidman Ltd | Other services | 2015 |
| Neovision London Ltd | Health & social care | 2026 |
| Neptune Fish Bar London Ltd | Hospitality | 2018 |
| Neptune Property Investment Limited | Real estate | 2020 |
| Nerdy Elephant Limited | Wholesale & retail | 2016 |
| Nerina Logistics Ltd | Transport & logistics | 2020 |
| Nesh H Services Ltd | Real estate | 2022 |
| Nessa EVA Limited | Administrative & support | 2012 |
| Nest Power Limited | Manufacturing | 2023 |
| Nest Property Solutions Limited | Construction | 2018 |
| Nestintheuk Limited | Real estate | 2024 |
| NET Recruitment HKG Limited | Administrative & support | 2018 |
| Netsixthform Limited | Information & communication | 2006 |
| Network Driver Limited | Transport & logistics | 2019 |
| Network Equity Ltd | Information & communication | 2016 |
| Network Travel Services Limited | Administrative & support | 1971 |
| Networth Group Ltd | Professional & scientific | 2022 |
| Neuroaudiology Limited | Health & social care | 2025 |
| Neurology Links Ltd | Health & social care | 2010 |
| New Air Climate Control Ltd | Construction | 2015 |
| New Beat Solutions Ltd | Professional & scientific | 2025 |
| New Dawn Grooming Limited | Wholesale & retail | 2024 |
| New Dawn Properties Limited | Administrative & support | 2000 |
| New Friends Limited | Other services | 2018 |
| New Heights Academy Limited | Education | 2025 |
| New Space Limited | Construction | 2005 |
| New Stoke Newington Shul | Other services | 2011 |
| New World Montessori Nursery Schools Limited | Education | 2003 |
| Newbrit Limited | Information & communication | 2003 |
| Newbuildbots Ltd | Information & communication | 2025 |
| Newday Project Delivery Limited | Administrative & support | 2023 |
| Newman Klitynsky Limited | Professional & scientific | 2009 |
| Newpon Ltd | Construction | 2024 |
| Newstead Court RTM Company Limited | Households | 2004 |
| Nexgen Capital Limited | Real estate | 2016 |
| Nexgen Supply Limited | Wholesale & retail | 2024 |
| Nexo Marketing Limited | Professional & scientific | 2016 |
| Next Building Construction Ltd | Construction | 2026 |
| Nexuses Limited | Information & communication | 2011 |
| Nexxus Worldwide (UK) Ltd | Professional & scientific | 2006 |
| NG Abode Ltd | Real estate | 2020 |
| Ngamia the Next Generation Limited | Health & social care | 2013 |
| NHM London Limited | Health & social care | 2025 |
| Ni.Ba.Ta Limited | Hospitality | 2012 |
| Nibslakhani Ltd | Professional & scientific | 2024 |
| Nicholas Construction Limited | Construction | 2014 |
| Nicholas Hart Properties Limited | Real estate | 2013 |
| Nicholas Karel Limited | Professional & scientific | 2023 |
| Nicholas Wales Ltd | Professional & scientific | 2014 |
| Nick LEE Graphics Ltd | Professional & scientific | 2024 |
| Nicola-Props.Co.Uk Ltd | Information & communication | 2001 |
| Nident Ltd | Health & social care | 2022 |
| Nifet Property Investment Limited | Construction | 2018 |
| Nifty Logic Limited | Education | 2019 |
| Nigel Allfrey Associates Limited | Professional & scientific | 2011 |
| Night Shark Ltd | Professional & scientific | 2011 |
| NIK Huggins Limited | Professional & scientific | 2014 |
| Nikam Ltd | Real estate | 2017 |
| Nikerose Ltd | Real estate | 2023 |
| Nikhil Sharma Ltd | Information & communication | 2025 |
| Nikunj Homes Ltd | Real estate | 2024 |
| Nila Iliza Limited | Wholesale & retail | 2023 |
| Nilkanth Sales Ltd | Wholesale & retail | 2025 |
| Nimble Atlas Limited | Professional & scientific | 2025 |
| Nimfar Ltd | Information & communication | 2014 |
| Nimz Chana Photography Limited | Professional & scientific | 2025 |
| Nina Finance Limited | Financial services | 2014 |
| Nina Solomon Design Limited | Professional & scientific | 2007 |
| Ninefold Investments Limited | Real estate | 2022 |
| Niraj Shah Limited | Professional & scientific | 2022 |
| Nirakar Consultancy Ltd | Information & communication | 2024 |
| Nirang Limited | Real estate | 2018 |
| Niro Intelligence Ltd | Information & communication | 2026 |
| Niruka Properties Ltd | Real estate | 2010 |
| Nirvair IT Consulting Ltd | Other services | 2016 |
| Nirvana Court Properties Limited | Real estate | 2012 |
| Nirvana Investments UK Ltd | Real estate | 2020 |
| Nirvana Search Ltd | Administrative & support | 2025 |
| Nirvana Social Work Ltd | Other services | 2020 |
| Nirvana Squared Limited | Hospitality | 2017 |
| Nisai House Limited | Education | 2012 |