| Multi-Skills Construction Services Limited | Administrative & support | 2000 |
| Multilevel International Construction Ltd | Construction | 2010 |
| Mulver Limited | Real estate | 2021 |
| Mumma's Kitchen Ltd | Hospitality | 2017 |
| Mumtaz Enterprises Ltd | Hospitality | 2021 |
| Munster Services Limited | Construction | 2019 |
| Muraul Properties UK Limited | Real estate | 2025 |
| MUS Food Ltd | Hospitality | 2025 |
| Muscadel Limited | Real estate | 1992 |
| Muse Inc CIC | Information & communication | 2021 |
| Music Waves Limited | Information & communication | 2024 |
| Mutley Meadows Ltd | Administrative & support | 2019 |
| Mutlum Trade Ltd | Hospitality | 2020 |
| Mutosh Tech Ltd | Information & communication | 2024 |
| Mutual AID Road Reps CIC | Health & social care | 2020 |
| MUX Imagery Ltd | Information & communication | 2025 |
| MV Universal Ltd | Construction | 2019 |
| MVS Tree Surgery Ltd | Administrative & support | 2021 |
| Mwcap Ltd | Financial services | 2019 |
| Mwmes Ltd | Construction | 2018 |
| MWW Security Ltd | Administrative & support | 2018 |
| My Brother BOB Limited | Professional & scientific | 2009 |
| My Core Pathways Ltd | Health & social care | 2025 |
| My Local Trades Limited | Extraterritorial | 2023 |
| My Solution Group Ltd | Information & communication | 2019 |
| Mydentity Plus | Other services | 2013 |
| Myhealthcpd Ltd | Education | 2021 |
| Myson Consulting and Services Ltd | Professional & scientific | 2022 |
| Mystic POD Ltd | Wholesale & retail | 2026 |
| N a Dudley Electrical Contractors Limited | Construction | 2005 |
| N Mills Brickwork Ltd | Construction | 2005 |
| N P Decorators Limited | Construction | 2003 |
| N P Trutwein Limited | Construction | 2007 |
| N R Howell Limited | Administrative & support | 2002 |
| N R Leisure Limited | Hospitality | 2020 |
| N-Code Ltd | Administrative & support | 2010 |
| N-Compass London Limited | Other services | 2011 |
| N.W.N Foods Limited | Hospitality | 2022 |
| N1 Express Ltd | Wholesale & retail | 2019 |
| N9NE Ltd | Other services | 2011 |
| NA Marketing Services Limited | Other services | 2001 |
| NA Property Services Ltd | Construction | 2016 |
| Naaz Limited | Hospitality | 1999 |
| NAC Property Ltd | Real estate | 2022 |
| Nachieve Group Ltd | Wholesale & retail | 2023 |
| Nadal Ltd | Construction | 2019 |
| Nadder Valley Carpentry Ltd | Construction | 2021 |
| Naels Group Ltd | Health & social care | 2023 |
| Nagrom Enterprises Limited | Professional & scientific | 1983 |
| Nagsu Properties Ltd | Real estate | 2025 |
| Nails Palace (Gillingham) Ltd | Other services | 2026 |
| Nana 2010 Ltd | Construction | 2015 |
| Nanny K S Donuts Ltd. | Hospitality | 2020 |
| Naomi Austen Limited | Administrative & support | 2026 |
| Napwood Systems Ltd | Information & communication | 2026 |
| Nardone Oilfield Industry Services Ltd | Professional & scientific | 2019 |
| Nasen New Material (Tianjin) Co., Ltd | Manufacturing | 2023 |
| Nasih Logistic Limited | Transport & logistics | 2013 |
| Nasseri Brothers Limited | Hospitality | 2014 |
| NAT Estates Management Limited | Real estate | 2025 |
| Natalia RAD Properties Ltd | Real estate | 2023 |
| National Social Media Awards Limited | Arts & recreation | 2019 |
| Nations Revival Chapel Ltd | Extraterritorial | 2025 |
| Nationwide Road Management Ltd | Construction | 2022 |
| Nature Works for Health Ltd | Professional & scientific | 2020 |
| Naturesline Foods Limited | Manufacturing | 2025 |
| Navscon Business Services Ltd | Wholesale & retail | 2023 |
| Navscon Limited | Administrative & support | 2019 |
| Nawab Gillingham Ltd | Hospitality | 2021 |
| Naxin Heavy Industry Group Co., Ltd | Manufacturing | 2023 |
| Nazde Ltd | Real estate | 2020 |
| Nazli Automobile Ltd | Wholesale & retail | 2020 |
| Nazool Limited | Hospitality | 2024 |
| NB Drylining Services Ltd | Construction | 2025 |
| NB Groundwork & Construction Ltd | Construction | 2025 |
| Nbag Ltd | Professional & scientific | 2023 |
| NC Group Construct Ltd | Construction | 2024 |
| ND Accreditation Limited | Education | 2025 |
| Ndicath Ltd | Wholesale & retail | 2024 |
| Ndumum Ltd | Health & social care | 2021 |
| NE Accounting & Tax Services Limited | Professional & scientific | 2020 |
| NE Management Systems Limited | Professional & scientific | 2013 |
| Nectorplan Ltd | Administrative & support | 2016 |
| Nefora Ltd | Arts & recreation | 2026 |
| Negu Tuition Services Ltd | Information & communication | 2019 |
| Nehedar Limited | Information & communication | 2019 |
| Nelson Social Club Limited | Hospitality | 2026 |
| Nemar Investments Limited | Real estate | 2023 |
| Neocept (UK) Limited | Professional & scientific | 2003 |
| Neoflat Property Limited | Construction | 2019 |
| NET Days Ltd | Information & communication | 2025 |
| Neural AI Recruitment Ltd | Information & communication | 2019 |
| New Alternative Investments Ltd | Financial services | 2011 |
| New Chans Limited | Hospitality | 2019 |
| New China Chef Ltd | Hospitality | 2024 |
| New Covenant Church Gillingham | Other services | 2025 |
| New Dragon Inn Chineses Takeaway Ltd | Hospitality | 2019 |
| New Forest Removals (Channel Islands) Limited | Professional & scientific | 2018 |
| New Future Trading Limited | Administrative & support | 2023 |
| New Generation Ballerz Limited | Education | 2023 |