| MYC Services Limited | Construction | 2025 |
| Myers Property Group Ltd | Real estate | 2026 |
| Mylora Aviation Consultancy Ltd | Professional & scientific | 2023 |
| Myocean Resources Limited | Information & communication | 2007 |
| Myprintexpress Ltd | Professional & scientific | 2023 |
| Mywavecommunications Limited | Information & communication | 2025 |
| Myyd Ltd | Health & social care | 2025 |
| MZS Export and Consultancy UK Limited | Wholesale & retail | 2023 |
| N & K Projects Limited | Real estate | 2024 |
| N Builders Ltd | Construction | 2022 |
| N K Z Property Solutions Limited | Real estate | 2025 |
| N P Smith Construction Ltd | Construction | 2004 |
| N W Mackay Services Limited | Construction | 2007 |
| N&J Security Limited | Administrative & support | 2026 |
| N&N Balloons Limited | Arts & recreation | 2024 |
| N&S Mechanical Ltd | Construction | 2019 |
| N.B.M Eyecare Ltd | Health & social care | 2023 |
| N.C Entrate Electrical Limited | Construction | 2025 |
| N.C. Construction Services Limited | Construction | 2003 |
| N.C. Property Services Limited | Construction | 2025 |
| N.J.S Property Management Limited | Other services | 2016 |
| N14 Construction Ltd | Construction | 2019 |
| N1C Services Limited | Construction | 2021 |
| N8 Property Solutions Ltd | Construction | 2014 |
| NA Commerce Ltd | Wholesale & retail | 2026 |
| Nabco Healthcare Ltd | Health & social care | 2022 |
| NAD Plus Direct Ltd | Wholesale & retail | 2026 |
| Nadira Limited | Real estate | 2018 |
| Nafin Limited | Education | 2016 |
| Naga Consulting Limited | Information & communication | 2016 |
| Nahak Vala Limited | Real estate | 2025 |
| Nailmtee Limited | Other services | 2023 |
| Naimg Limited | Arts & recreation | 2020 |
| Naish Creative Imaging Limited | Professional & scientific | 2018 |
| Naitsirc Ltd | Professional & scientific | 2019 |
| Najairo Properties Ltd | Real estate | 2025 |
| Naksh Limited | Real estate | 2025 |
| Namzim Limited | Health & social care | 2021 |
| Nany Building Ltd | Construction | 2020 |
| Napier Psychology Ltd | Professional & scientific | 2011 |
| Naqi Business Management Limited | Professional & scientific | 2018 |
| NAR Construct Ltd | Construction | 2024 |
| Narboro Court Management Company Limited | Households | 1982 |
| Nasima Patel Consultancy Ltd | Professional & scientific | 2014 |
| Natalex Property Ltd | Households | 2025 |
| Natalex Velocity Ltd | Manufacturing | 2019 |
| Nataquatic Ltd | Education | 2025 |
| Natcyn Ltd | Health & social care | 2023 |
| Natgab Consultancy Limited | Information & communication | 2015 |
| Natheekarn Limited | Real estate | 2025 |
| National Food Delivery Limited | Hospitality | 2017 |
| Navy Fashion Limited | Other services | 2018 |
| Nayasha Fashion House Ltd | Wholesale & retail | 2017 |
| NAZ Lets Ltd | Real estate | 2024 |
| Nazneen Akash Properties Limited | Real estate | 2024 |
| Nazneen Sudhan Akash Prashar Ltd | Health & social care | 2020 |
| NB IT Ltd | Construction | 2023 |
| Nbtlf Limited | Real estate | 2023 |
| NCS Life Solutions Limited | Information & communication | 2022 |
| ND Building & Renovation Ltd | Construction | 2026 |
| ND Major Properties Limited | Real estate | 2024 |
| ND Planning Limited | Professional & scientific | 2019 |
| Nebacheo Medical Ltd | Health & social care | 2015 |
| Nebula Home Construction Ltd | Construction | 2023 |
| Nebula Home Improvements Ltd | Real estate | 2020 |
| NEC Logistics Limited | Wholesale & retail | 2023 |
| Needpro Homes Ltd | Real estate | 2026 |
| Neil Greenway Limited | Health & social care | 2019 |
| Nelmes INV Ltd | Real estate | 2023 |
| Nelson Wire Art Ltd | Arts & recreation | 2025 |
| Nemain Services Ltd | Information & communication | 2019 |
| Nemos Plaice Limited | Hospitality | 2019 |
| Nene Learning Limited | Information & communication | 2004 |
| Nenkov Ltd | Construction | 2014 |
| Neon Energy Brokers Ltd | Energy | 2020 |
| NET Pros UK Ltd | Professional & scientific | 2014 |
| Netboi Solutions Ltd | Other services | 2024 |
| Netgroupstat Limited | Real estate | 2009 |
| Neti Properties Ltd | Real estate | 2023 |
| Neurasys Ltd | Information & communication | 2025 |
| Neuropharma Limited | Health & social care | 2025 |
| Nevas Group Ltd | Construction | 2023 |
| New Covenant House Limited | Financial services | 2026 |
| New Decorations and Brickwork Ltd | Construction | 2025 |
| New ERA Technical Consulting Limited | Professional & scientific | 2013 |
| New Forest Dental Practice Limited | Health & social care | 2007 |
| New Heights Fitness Limited | Arts & recreation | 2020 |
| New Links Consulting Services Ltd | Professional & scientific | 2022 |
| New Look Ortholabs Ltd | Health & social care | 2004 |
| New Model Holdings Limited | Real estate | 2017 |
| New Pro IT Ltd | Information & communication | 2014 |
| New Radio 5G Consulting Ltd. | Information & communication | 2019 |
| New Regal Fish Bar Limited | Hospitality | 2020 |
| New Troy Consultants Ltd | Administrative & support | 2024 |
| New Vision London Construction Ltd | Construction | 2016 |
| New Vision Recruitment Limited | Administrative & support | 2023 |
| Newbury Dentist Limited | Health & social care | 2006 |
| Newday Drywall Ltd | Construction | 2019 |
| Newham Boxing Ltd | Arts & recreation | 2026 |
| Newham Community Recycling Limited | Extraterritorial | 2000 |