| Myrtle Business Services Limited | Professional & scientific | 2012 |
| Myrus Smith Limited | Professional & scientific | 1994 |
| Myswitchpro Limited | Other services | 2019 |
| Myswitchpro Two Limited | Information & communication | 2021 |
| MYT Accounts Limited | Professional & scientific | 2021 |
| MZ Sharh Ltd | Wholesale & retail | 2025 |
| N & J Properties Limited | Real estate | 2000 |
| N Bhowmik Ltd | Real estate | 2022 |
| N L Robertson Hair Limited | Other services | 2025 |
| N&A Associates Ltd | Real estate | 2023 |
| N&R Accounting Ltd | Professional & scientific | 2024 |
| N. Santos Ltd | Construction | 2018 |
| N.Chohan Ltd | Health & social care | 2025 |
| Na&M Limited | Information & communication | 2026 |
| Naad Spandan Music & Wellbeing CIC | Education | 2026 |
| Naaz Solutions Limited | Professional & scientific | 2018 |
| Nadi Properties Ltd | Real estate | 2026 |
| Nadux Enterprises Ltd | Professional & scientific | 2020 |
| Nafpp Ltd | Other services | 2023 |
| Nagas Tech Ltd | Extraterritorial | 2022 |
| Nahida Limited | Hospitality | 2020 |
| Nail Concept GD Ltd | Other services | 2024 |
| Nailed by Riri Academy Ltd | Education | 2025 |
| Nails DE Angel Limited | Other services | 2025 |
| Najssq Limited | Wholesale & retail | 2024 |
| Naked Assets Ltd | Financial services | 2025 |
| Naks London Ltd | Real estate | 2024 |
| Namaste Nepali Community UK Ltd | Other services | 2020 |
| Nami Consulting Ltd | Information & communication | 2022 |
| Nanabull Ltd | Financial services | 2023 |
| Naniko Limited | Health & social care | 2019 |
| NAP Property Management Limited | Real estate | 2011 |
| Napton Holdings Limited | Real estate | 2025 |
| Narccorn Limited | Construction | 2014 |
| Narcissist Studios Ltd | Information & communication | 2022 |
| Narrenge Ltd | Hospitality | 2014 |
| NAS Investments (UK) Limited | Real estate | 2002 |
| NAS Properties Limited | Real estate | 2001 |
| Naseebbaba Ltd | Transport & logistics | 2021 |
| Naseema Dental Supplies Limited | Manufacturing | 2023 |
| Nash and Partners Ltd | Health & social care | 2022 |
| Nashex Ltd | Education | 2025 |
| Nashira Consulting Ltd | Professional & scientific | 2025 |
| Nassan Limited | Other services | 2011 |
| NAT Agency 101 Ltd | Professional & scientific | 2020 |
| NAT Films Ltd | Information & communication | 2019 |
| Natalie Gollop Limited | Professional & scientific | 2021 |
| National Fire & Security Systems Ltd | Administrative & support | 2017 |
| Nationwide Accountants & Tax Advisors Ltd | Professional & scientific | 2010 |
| Nationwide Cleaners (South London) Limited | Administrative & support | 2011 |
| Nationwide Roof Professionals Ltd | Construction | 2025 |
| Nativity Theatre Limited | Administrative & support | 2016 |
| Natural ME Ceylon Limited | Real estate | 2024 |
| Natural Viibe Limited | Wholesale & retail | 2023 |
| Naturalcuppa Ltd | Manufacturing | 2014 |
| Naturcare Ltd. | Health & social care | 2011 |
| Nature's Shield Limited | Extraterritorial | 2013 |
| Naturelink Ltd | Wholesale & retail | 2021 |
| Naunton Morgan Consulting Limited | Professional & scientific | 2025 |
| NAV Intellects Ltd | Information & communication | 2018 |
| Navi Consulting Limited | Wholesale & retail | 2019 |
| Navi Properties Limited | Real estate | 2021 |
| Navigation House Management Company Limited | Households | 2005 |
| Navonmesh Ltd | Information & communication | 2016 |
| Nawazco Limited | Households | 2022 |
| Nayan (UK) Limited | Health & social care | 2014 |
| Nbkc PVT Ltd | Wholesale & retail | 2017 |
| Nblc Property Ltd | Real estate | 2020 |
| Nbsk Ltd | Wholesale & retail | 2013 |
| NCN Projects Ltd | Construction | 2023 |
| NCR Building Services Limited | Construction | 2019 |
| NDA Civil/Structures Solution Ltd | Construction | 2018 |
| NDH Direct Ltd | Wholesale & retail | 2013 |
| NDS Property Limited | Real estate | 2021 |
| Ndtv Technologies Limited | Information & communication | 2013 |
| Nealcon Ltd | Information & communication | 2017 |
| Neat & Tidy Landscape Limited | Administrative & support | 2015 |
| Neceda Limited | Wholesale & retail | 2016 |
| Nectar Monitoring Limited | Information & communication | 2014 |
| Neer Properties Ltd | Real estate | 2018 |
| Neetto Ltd | Wholesale & retail | 2025 |
| Neloo Properties Limited | Real estate | 2023 |
| Nelson Landscapes Ltd | Administrative & support | 2022 |
| NEO Block Management Ltd | Households | 2025 |
| Neoenergeia Limited | Energy | 2018 |
| Neon Nights Events Ltd | Administrative & support | 2025 |
| Neospace Design and Build Ltd | Construction | 2024 |
| Neriox Ltd | Construction | 2023 |
| Nest Bathrooms Ltd | Construction | 2023 |
| Nest Building Group Ltd | Construction | 2022 |
| Nest Cafe & Kitchen Ltd | Hospitality | 2025 |
| Nestwell Ltd | Real estate | 2024 |
| Netcat Solutions Limited | Information & communication | 2008 |
| Netnester Ltd | Information & communication | 2019 |
| Network Horizon Limited | Financial services | 2025 |
| Network Needs Limited | Information & communication | 2006 |
| Neura Systems Ltd | Information & communication | 2025 |
| Neureka Consulting Limited | Information & communication | 2012 |
| Neurmedsrv Ltd | Health & social care | 2023 |
| New Chicken Land Ltd | Hospitality | 2017 |