| Mortell Homes Limited | Construction | 2020 |
| Moss 3D Limited | Professional & scientific | 2018 |
| Moss Investments Ltd | Real estate | 2002 |
| Most Mira | Education | 2009 |
| Mota Properties Ltd | Real estate | 2025 |
| Motis Freeflow Limited | Transport & logistics | 2019 |
| Mould Removal Kent Ltd | Administrative & support | 2025 |
| Movega Removals Limited | Information & communication | 2016 |
| MPP Image Creation Ltd | Professional & scientific | 2011 |
| MR R Barbers Ltd | Other services | 2025 |
| MR. Whippet's Cafe Limited | Hospitality | 2023 |
| Mr.Binz Limited | Administrative & support | 2025 |
| MRF Services (South East) Limited | Construction | 2024 |
| Mrfixitkent Ltd | Construction | 2019 |
| MSK Consulting Limited | Information & communication | 2010 |
| MT Drains Kent Ltd | Water & waste | 2019 |
| MT Wells Property Ltd | Construction | 2023 |
| Mtime Alion Advisory Trading Ltd | Wholesale & retail | 2026 |
| MTM Carpentry Ltd | Manufacturing | 2024 |
| MTY Manager Services Ltd | Construction | 2017 |
| Muce Home Ltd | Real estate | 2025 |
| Muce London Ltd | Wholesale & retail | 2024 |
| Much More Creative Limited | Professional & scientific | 2016 |
| Muffincare Ltd | Health & social care | 2022 |
| Mukar Life Ltd | Water & waste | 2026 |
| Mulberry Mews Management Ltd | Real estate | 2025 |
| Mulberry Place NR3 MAN Co Limited | Households | 2022 |
| Multiply Online Ltd | Professional & scientific | 2024 |
| Mumdad Records Ltd | Information & communication | 2020 |
| Music Café Folkestone Limited | Hospitality | 2023 |
| Music Developments Ltd | Hospitality | 2019 |
| Music Intel Ltd | Information & communication | 2026 |
| Musical Walkabout CIC | Health & social care | 2017 |
| Mustang Motors Ltd | Wholesale & retail | 2016 |
| Musthang Ltd | Construction | 2019 |
| Mvdv Limited | Wholesale & retail | 2016 |
| MW Aviation Training Ltd | Transport & logistics | 2019 |
| MWE Business Services Limited | Administrative & support | 2023 |
| MWG Locums Limited | Wholesale & retail | 2020 |
| My 4 Stars Limited | Wholesale & retail | 2024 |
| Mybizpool Ltd | Information & communication | 2019 |
| Mysozi Accommodations Ltd | Hospitality | 2021 |
| Mysozi Ltd | Hospitality | 2019 |
| Mysozi Properties Ltd | Real estate | 2021 |
| N & H Catering and Events Limited | Hospitality | 2020 |
| N a Brown Services Ltd | Transport & logistics | 2006 |
| N J Apps Ltd | Agriculture & fishing | 2021 |
| N J Apps Properties Ltd | Real estate | 2024 |
| N R Electrical Services (NR) Ltd | Construction | 2023 |
| N&Sg Smiles Ltd | Health & social care | 2023 |
| Nadia Doherty Creative Ltd | Arts & recreation | 2024 |
| Nail and Beauty Excellence Limited | Wholesale & retail | 2019 |
| Nailed IT Commercial Carpentry Ltd | Manufacturing | 2022 |
| Nails & Beauty Zone Limited | Other services | 2016 |
| Nakg Limited | Transport & logistics | 2023 |
| Nally Track and Corporate Limited | Hospitality | 2006 |
| Nanda PTY Ltd | Real estate | 2018 |
| Napoleon Management (Sandgate) Limited | Households | 2015 |
| Nash & Tinson-Shaw Ltd | Real estate | 2021 |
| Nasser Ltd | Information & communication | 2015 |
| Natalina's Ltd | Hospitality | 2024 |
| National Chimney Sweeping Safety Association Limited | Administrative & support | 2018 |
| Native SKI Ltd | Hospitality | 2016 |
| Native Three Ltd | Wholesale & retail | 2021 |
| Natow Logistics Ltd | Wholesale & retail | 2025 |
| Natural Health Centre Folkestone Ltd | Health & social care | 2010 |
| Natural Look Medical Aesthetics Ltd | Other services | 2023 |
| Natural Resonance Festival CIC | Professional & scientific | 2025 |
| Natural Symphony Ltd | Information & communication | 2021 |
| Nautilus Court Limited | Real estate | 2004 |
| NAZ Kent Limited | Hospitality | 2017 |
| Nbco Consulting Limited | Administrative & support | 2017 |
| Neal Training Limited | Professional & scientific | 1996 |
| Necker & Co. Limited | Professional & scientific | 2003 |
| Neil Connor Limited | Administrative & support | 2011 |
| Neil Muller Ltd | Construction | 2010 |
| Neka Wellbeing Ltd | Health & social care | 2024 |
| Neka Wellbeing Sandgate Ltd | Health & social care | 2024 |
| Nemesis Vidar Ltd | Information & communication | 2025 |
| Neon Naked Events Ltd | Arts & recreation | 2024 |
| Nepali Food Hub Limited | Hospitality | 2025 |
| Nephin Property Ltd | Real estate | 2017 |
| Nerd Shelf Limited | Wholesale & retail | 2025 |
| Nestdore Ltd | Information & communication | 2025 |
| Nestforge Ltd | Real estate | 2025 |
| NET an Agent Ltd | Information & communication | 2011 |
| NET Villages Group Limited | Financial services | 2022 |
| NET2TEL Limited | Information & communication | 2003 |
| Netgains FX Ltd | Wholesale & retail | 2020 |
| Netprocure Ltd | Information & communication | 2025 |
| Neuratron Group Limited | Financial services | 2004 |
| Neuratron Limited | Information & communication | 2000 |
| Neurofract Ltd | Information & communication | 2026 |
| NEV50 Limited | Hospitality | 2025 |
| New Hawkinge Catering Ltd | Hospitality | 2026 |
| New Guard Pest Control Ltd | Administrative & support | 2020 |
| New Himalayan Cafe Limited | Hospitality | 2016 |
| New Hope Holdings Limited | Financial services | 2021 |
| New Horizons Broad Oak Limited | Health & social care | 2002 |
| New Planet School Ltd | Education | 2022 |