| Nesimi Construction Ltd | Construction | 2017 |
| Nessa Lasers UK Limited | Wholesale & retail | 2019 |
| Nestos Shop Ltd | Wholesale & retail | 2023 |
| NET Objective (UK) Limited | Information & communication | 2001 |
| Netrel Nutrition Ltd | Wholesale & retail | 2026 |
| Neuronz Limited | Information & communication | 2021 |
| Neuronz Properties Limited | Real estate | 2024 |
| Neutra Aesthetics London Ltd | Other services | 2024 |
| Nevag Properties Ltd | Real estate | 2025 |
| Nevnate Health Ltd | Administrative & support | 2019 |
| Nevos Limited | Health & social care | 2021 |
| New Auto Tech Limited | Wholesale & retail | 2009 |
| New Chapter Consulting Group Ltd | Other services | 2016 |
| New Datum Limited | Other services | 2006 |
| New ERA & Generation Holdings Limited | Financial services | 2016 |
| New ERA Lettings Limited | Real estate | 2016 |
| New Lees Express Ltd | Hospitality | 2026 |
| New Lodge Assets Limited | Financial services | 2025 |
| New Master Consulting Ltd | Construction | 2010 |
| New Tribe Designs Limited | Professional & scientific | 2023 |
| Newbeck Limited | Financial services | 2020 |
| Newbrook Lettings Limited | Real estate | 2008 |
| Newgate Business Space Limited | Real estate | 2015 |
| Newgate Business Space NO2 Ltd | Financial services | 2018 |
| Newgreen Artificial Grass Limited | Administrative & support | 2022 |
| Newman Property Solutions Ltd | Real estate | 2022 |
| Newtime Consulting Limited | Information & communication | 2012 |
| Nexa Care Services Ltd | Health & social care | 2026 |
| Next Horizon Consulting Ltd | Professional & scientific | 2024 |
| Next Level Estates Ltd | Real estate | 2021 |
| Next Level Support Ltd | Administrative & support | 2024 |
| Next Move Automotives Ltd | Wholesale & retail | 2026 |
| Next Wave International | Other services | 2004 |
| Neza Aesthetics Ltd | Other services | 2025 |
| Neza Contractors Ltd | Construction | 2023 |
| Neza Ltd | Construction | 2021 |
| Ngmkt Limited | Professional & scientific | 2024 |
| NGU Contractors Ltd | Construction | 2023 |
| NHU Ltd | Administrative & support | 2019 |
| NHY Enterprise Limited | Real estate | 2024 |
| NI ROK Limited | Construction | 2013 |
| NIA Comms Limited | Professional & scientific | 2014 |
| Niaprojam Interiors Ltd | Financial services | 2020 |
| NIC and LOU Limited | Arts & recreation | 2012 |
| Nick Pirillas Consulting Ltd | Information & communication | 2025 |
| Nick Renovations Ltd | Construction | 2024 |
| Nicole Starfashion Limited | Manufacturing | 2011 |
| Niityaa Ltd | Professional & scientific | 2021 |
| Nikdar Star Ltd | Construction | 2021 |
| Nikinrn Limited | Water & waste | 2025 |
| Niko's Kitchen Ltd | Hospitality | 2023 |
| Nikunj Ltd | Manufacturing | 2025 |
| Nimble Internet Limited | Information & communication | 2022 |
| Nimblebyte Ltd | Information & communication | 2023 |
| Nimbus Contractors Ltd | Construction | 2025 |
| Niner Products Limited | Wholesale & retail | 2017 |
| Nitanda Ekhukhulu Ltd | Public administration | 2024 |
| NJM Woodmachinery (2000) Ltd | Wholesale & retail | 1999 |
| Nkwelectrical Ltd | Construction | 2018 |
| NLR North London Roofing Ltd | Construction | 2025 |
| Nm&W Property Ltd | Real estate | 2021 |
| NNC Construct Ltd | Construction | 2026 |
| NO One Right Answer Limited | Professional & scientific | 2011 |
| NO Sleep Logistics Ltd | Transport & logistics | 2025 |
| Noava Investments Limited | Real estate | 2022 |
| Noba International Limited | Professional & scientific | 2020 |
| Nomman Limited | Health & social care | 2020 |
| Nonwoven Trading Ltd. | Wholesale & retail | 2008 |
| Noonan Residential LLP | | 2017 |
| Nord Video Company Ltd | Information & communication | 2021 |
| Norma Hill Smith Limited | Wholesale & retail | 2026 |
| Norris Grove Limited | Real estate | 2022 |
| North London GAS Services Ltd | Construction | 2023 |
| North London Jaguars Ltd | Wholesale & retail | 2011 |
| North London Legal Services Limited | Administrative & support | 2019 |
| North Woolwich Road Management Company Limited | Real estate | 2022 |
| Northaw Estates Freehold Limited | Real estate | 2009 |
| Northaw Estates Group Limited | Financial services | 2009 |
| Northaw Estates Leasehold Limited | Real estate | 2009 |
| Northgate Holdings Ltd | Construction | 2025 |
| Northside MT Limited | Arts & recreation | 2019 |
| Northstar Turnkey Projects Ltd | Construction | 2023 |
| Northways Services Limited | Professional & scientific | 1958 |
| Norval Lesley Limited | Health & social care | 2025 |
| Novastone Construction Ltd | Real estate | 2019 |
| Novellino Bistro Ltd | Hospitality | 2019 |
| Novellino London Ltd | Hospitality | 2013 |
| Novum ECC UK Ltd | Professional & scientific | 2024 |
| Novum Property Services Ltd | Construction | 2021 |
| NOW Films Limited | Information & communication | 2023 |
| NPA Roofing & Building Ltd | Construction | 2025 |
| NQ Learning Ltd | Education | 2023 |
| NR Bathrooms & Buildings Limited | Construction | 2026 |
| NSD Roofing and Upvc Limited | Construction | 2021 |
| NSG Cleaning Contractors Ltd | Administrative & support | 2025 |
| NUE Millet Limited | Wholesale & retail | 2021 |
| Nurtured at Home Care Limited | Health & social care | 2023 |
| Nuto Electrics Ltd | Energy | 2025 |
| Nuttalls Electrical Ltd | Construction | 2025 |
| Nuvada Ltd | Other services | 2025 |