| Modular Training for Broadcast Limited | Information & communication | 2021 |
| Monticasa Ltd | Real estate | 2022 |
| Moomii Limited | Wholesale & retail | 2021 |
| Moorhouse Music LLP | | 2014 |
| Morays Concepts Limited | Health & social care | 2025 |
| MORE2CONSTRUCTION Limited | Professional & scientific | 2023 |
| Morefloorless Limited | Wholesale & retail | 2010 |
| Motor Law Publications Limited | Information & communication | 1987 |
| Mount EVO Ltd | Wholesale & retail | 2021 |
| Mowbray Fields Ltd | Hospitality | 2019 |
| Moxoto Limited | Information & communication | 2018 |
| MPH Motor Engineers Limited | Wholesale & retail | 2016 |
| Mrccarpentry Limited | Manufacturing | 2023 |
| MSC Global Services Ltd | Wholesale & retail | 2026 |
| MSE Ventures Ltd | Wholesale & retail | 2024 |
| Mttt Ltd | Information & communication | 2024 |
| Muah Ltd | Wholesale & retail | 2014 |
| Mucky PUP Design Ltd | Administrative & support | 2017 |
| Murmuration Corporation Ltd | Real estate | 2024 |
| Murray Beelaerts Limited | Professional & scientific | 2016 |
| Mvsoxon Ltd | Wholesale & retail | 2024 |
| My Schoolwear Limited | Wholesale & retail | 2013 |
| My Traders Ltd | Wholesale & retail | 2025 |
| Mybennu Ltd | Wholesale & retail | 2024 |
| Myindos Ltd | Real estate | 2026 |
| Myla Homes Ltd | Construction | 2025 |
| Mymi Healthcare Ltd | Health & social care | 2023 |
| Myna Nails Ltd | Other services | 2026 |
| Myrka Limited | Financial services | 2026 |
| N Hammond Electrical Services Ltd | Construction | 2013 |
| Naar Investment Ltd | Real estate | 2023 |
| Nailcote Homes Ltd | Real estate | 2019 |
| NAJ Property Developer Ltd | Construction | 2026 |
| Nameless Planet Ltd | Wholesale & retail | 2022 |
| Namiec D Automobile Imports Limited | Wholesale & retail | 2025 |
| Napier Limited | Wholesale & retail | 1990 |
| Napier of London Limited | Professional & scientific | 1997 |
| NAS Project Management Limited | Professional & scientific | 2022 |
| Natalie Fraser Health and Beauty Ltd | Health & social care | 2012 |
| National Association for Able Children in Education | Education | 2008 |
| Natural Mystik Ltd | Manufacturing | 2017 |
| Natural Stone Tiles Ltd | Construction | 2004 |
| Naturally Neat Cleaners Ltd | Administrative & support | 2025 |
| NBS Clothing. Ltd | Wholesale & retail | 2026 |
| NE Vanguard Ltd | Information & communication | 2025 |
| Neil Thompson Strategic Services Limited | Professional & scientific | 2019 |
| Nestimate Ltd | Information & communication | 2025 |
| Network Fleet Ltd | Wholesale & retail | 2021 |
| Network Taxis Limited | Transport & logistics | 2000 |
| Network Vehicle Hire Ltd | Administrative & support | 2021 |
| Netzero Assets International Ltd | Information & communication | 2023 |
| New Manor Homes Limited | Construction | 2017 |
| New Pattern Labs Ltd. | Information & communication | 2023 |
| New Thing Limited | Professional & scientific | 2009 |
| Newskai Ltd | Real estate | 2026 |
| Newstone Investments (ES) Ltd | Financial services | 2023 |
| Newstone Investments (UK) Ltd | Real estate | 2023 |
| Nexara Care Limited | Health & social care | 2026 |
| Nexis Nutraceuticals Limited | Professional & scientific | 2025 |
| Nexstep Ltd | Construction | 2024 |
| Nezam Limited | Health & social care | 2025 |
| Nflm Ltd | Real estate | 2023 |
| Nfrh (UK) Ltd | Financial services | 2023 |
| Nfrps (UK) Ltd | Financial services | 2023 |
| NGO SPV Limited | Financial services | 2025 |
| NIC Sharman Consultancy Ltd | Professional & scientific | 2020 |
| Nicky Gymnastics Club Ltd | Administrative & support | 2024 |
| Nilocas Ltd | Health & social care | 2023 |
| Nito Konsult Ltd | Health & social care | 2022 |
| NNNEKYDEE1 Limited | Public administration | 2021 |
| Noel Williams Racing Limited | Agriculture & fishing | 2013 |
| North Star Marketing Operations Ltd | Professional & scientific | 2025 |
| Northbridgegroup Ltd | Manufacturing | 2025 |
| Northstar Security Limited | Administrative & support | 2019 |
| Nova Logistics Network Ltd | Transport & logistics | 2026 |
| Nsrh (ES) Ltd | Financial services | 2023 |
| Nsrh (UK) Ltd | Financial services | 2023 |
| Nsrps (ES) Ltd | Financial services | 2023 |
| Nsrps (UK) Ltd | Financial services | 2023 |
| Nsys Tech Ltd | Administrative & support | 2013 |
| Nude OX Limited | Wholesale & retail | 2023 |
| Nupay Ltd | Professional & scientific | 2025 |
| Nuspace Engineering Limited | Professional & scientific | 2025 |
| Nuway Services Ltd | Construction | 2016 |
| Nvhrh (UK) Ltd | Financial services | 2023 |
| Nvhrps (UK) Ltd | Financial services | 2023 |
| NW Marketing Ltd | Administrative & support | 2017 |
| NX First Ltd | Manufacturing | 2026 |
| Nyamira Labs Ltd | Information & communication | 2026 |
| O'Connor Associates Limited | Professional & scientific | 2022 |
| OA Idea Ltd | Information & communication | 2025 |
| Oakdell Properties Limited | Construction | 2006 |
| Oakley Wood Master Construction Ltd | Construction | 2016 |
| Oakmont Private Office Ltd | Real estate | 2019 |
| OAT Hair and Beauty Ltd | Other services | 2026 |
| OB Travels and Logistics Services Limited | Wholesale & retail | 2022 |
| Obhrai Corporation Ltd | Professional & scientific | 2022 |
| OBN (UK) Ltd | Other services | 2008 |
| OBN Compliance Limited | Professional & scientific | 2022 |
| OBS Consultancy Ltd | Professional & scientific | 2025 |