| Nayyar Holdings Limited | Professional & scientific | 2010 |
| Nayyar Properties Limited | Real estate | 2010 |
| Nayyar Textiles Garments Limited | Wholesale & retail | 1939 |
| Nayyar Textiles Limited | Administrative & support | 1990 |
| NAZ Builders Extension & Loft Limited | Construction | 2024 |
| Nazar Construction Ltd | Construction | 2020 |
| Nazco Properties Ltd | Real estate | 2025 |
| NB Coaching Development Ltd | Education | 2024 |
| Ncbi Training CIC | Education | 2019 |
| NCC South East Limited | Construction | 2002 |
| Ncivs Ltd | Professional & scientific | 2025 |
| ND Cafe Ltd | Hospitality | 2025 |
| NDR Electrical Services Ltd | Construction | 2022 |
| NE NA London Ltd | Wholesale & retail | 2026 |
| Nederveen & Davies Ltd | Hospitality | 2026 |
| Nederveen Ltd | Information & communication | 2021 |
| NEF Energy Limited | Wholesale & retail | 2019 |
| Nefe Ventures Limited | Information & communication | 2015 |
| Nefesh Services Limited | Wholesale & retail | 2020 |
| Negrusa Limited | Health & social care | 2016 |
| Neil Sullivan & Sons Limited | Administrative & support | 2001 |
| Neilson Partners LLP | | 2024 |
| NEK Consultants Limited | Construction | 2011 |
| Nela Scaffolding Ltd | Construction | 2016 |
| Nelk Ltd | Information & communication | 2006 |
| Neoda Limited | Other services | 2014 |
| Neopaps Limited | Real estate | 1998 |
| Nepsun Limited | Information & communication | 2012 |
| Nera Solutions Ltd | Wholesale & retail | 2018 |
| Nerd Limited | Professional & scientific | 2017 |
| Neric Finance Limited | Financial services | 1968 |
| Neric Limited | Professional & scientific | 1980 |
| Nermiltes-Uk Ltd | Administrative & support | 2026 |
| Netcore Cloud Limited | Information & communication | 2018 |
| Nettem Ltd | Administrative & support | 2022 |
| Netty Harbut Ltd | Financial services | 2019 |
| Netty Properties Ltd | Real estate | 2022 |
| Network Healthcare (Kent) Ltd | Administrative & support | 2014 |
| Netzeero Ltd | Professional & scientific | 2025 |
| Neuro Coaching Collective Limited | Other services | 2024 |
| Nevena Court (Freehold) Limited | Real estate | 1986 |
| Never Satisfied Movement Ltd | Wholesale & retail | 2026 |
| Neville Court (Croydon) Residents Association Limited | Households | 1969 |
| New Beckenham Cricket Club Limited | Arts & recreation | 2022 |
| New ERA Technology Group Limited | Wholesale & retail | 2019 |
| New Gence Limited | Information & communication | 2020 |
| New Harbour Bridging Limited | Financial services | 2016 |
| New Life Ministries International | Professional & scientific | 2007 |
| New Media XL Ltd | Information & communication | 2010 |
| New Mill Quarter RTM Company Limited | Households | 2025 |
| New Naratif Limited | Professional & scientific | 2017 |
| New Path Productions Limited | Professional & scientific | 2009 |
| New Tech Tools Limited | Manufacturing | 2001 |
| New Tomorrow Ltd | Wholesale & retail | 2022 |
| New Vandal Media Ltd | Information & communication | 2024 |
| Newagile Ltd | Wholesale & retail | 2021 |
| Newera Lakeside Limited | Administrative & support | 2019 |
| Newera Partnership Limited | Administrative & support | 2019 |
| Newgrange Properties Limited | Real estate | 2012 |
| Newlands House (London) RTM Company Limited | Real estate | 2025 |
| Newnhams Gate Management Co Ltd | Real estate | 2009 |
| Newrig Ltd | Energy | 2024 |
| Newromeo Property Management Limited | Households | 2002 |
| Newtcp CIC | Arts & recreation | 2014 |
| Newton Media Holdings Limited | Information & communication | 2012 |
| Newton Media Ltd | Information & communication | 2003 |
| Newton Richmere Property Consultants Limited | Real estate | 2019 |
| Nexa Collective Ltd | Health & social care | 2022 |
| Nexaplay Technologies Limited | Information & communication | 2026 |
| Nexaya Ltd | Real estate | 2025 |
| Nexere Consulting Limited | Administrative & support | 1998 |
| Nexim Ltd | Professional & scientific | 2020 |
| Next Dent Ltd | Wholesale & retail | 2018 |
| Next GEN FT Limited | Information & communication | 2025 |
| Next Steps Properties Ltd | Real estate | 2024 |
| Nextera Ventures Limited | Financial services | 2022 |
| Nextground Property Management Limited | Households | 1989 |
| Nexum New Builds Limited | Construction | 2026 |
| Nexus Cart Ltd | Wholesale & retail | 2025 |
| Nexus Red Limited | Professional & scientific | 2013 |
| NFA Consultancy Ltd | Health & social care | 2012 |
| NFB Logistics Limited | Transport & logistics | 2023 |
| NFS Autos Ltd | Wholesale & retail | 2021 |
| NG Works Limited | Professional & scientific | 2018 |
| Ngati Ranana Limited | Education | 2018 |
| NGP Flooring Ltd | Construction | 2019 |
| NGU International Ltd | Extraterritorial | 2018 |
| Nheta Auto Engineering Ltd | Professional & scientific | 2026 |
| NHN Trading Limited | Hospitality | 2022 |
| Niab Ventures Ltd | Real estate | 2017 |
| Niapson's Ltd | Construction | 2017 |
| Nical Limited | Real estate | 2025 |
| Nice Gaff Antiques Ltd | Wholesale & retail | 2020 |
| Nicgab Limited | Financial services | 2024 |
| Niche Building Contractors Ltd | Construction | 2025 |
| Niche Electrical Contractors Limited | Construction | 2019 |
| Niche Mortgage Info Limited | Information & communication | 2019 |
| Nicholas James of Locksbottom Ltd | Wholesale & retail | 2018 |
| Nichols Trading (London) Ltd | Administrative & support | 2016 |
| Nick Langham Associates Limited | Education | 2025 |