| Maxj Media Limited | Information & communication | 2022 |
| Maxted Properties Limited | Real estate | 2021 |
| Mayes & Johnson Ltd | Real estate | 2010 |
| MB Consultancy Design Ltd | Other services | 2012 |
| MB Technical Direction Ltd | Professional & scientific | 2021 |
| MB Wellbeing Limited | Public administration | 2022 |
| MBZ Autos Limited | Wholesale & retail | 2015 |
| MC Building Services Ltd | Construction | 2025 |
| MC OTM Management Ltd | Real estate | 2025 |
| Mckenzie Legal Limited | Professional & scientific | 2017 |
| Mcnally Electrical Ltd | Construction | 2011 |
| MCS (Kent) Ltd | Construction | 2021 |
| Mdaa Builders Ltd | Construction | 2016 |
| Meeple Corp Limited | Information & communication | 2023 |
| Meld Consulting Ltd | Professional & scientific | 2024 |
| Meltdowns Limited | Professional & scientific | 2004 |
| Merch Collective Limited | Wholesale & retail | 2015 |
| Mercurial Media Ltd. | Administrative & support | 2016 |
| Mermaid (Broadstairs) Ltd | Hospitality | 2021 |
| Metal Frame Tech Limited | Manufacturing | 2021 |
| Meyors Street Food Ltd | Hospitality | 2026 |
| Michael Crees Racing Limited | Administrative & support | 2023 |
| Michael Ruane Limited | Professional & scientific | 2016 |
| Miles More Garden Maintenance Ltd | Administrative & support | 2025 |
| Milestrades Ltd | Financial services | 2024 |
| Miller & Thunder Limited | Arts & recreation | 2023 |
| Mind Food Body Ltd | Education | 2023 |
| Mind the GAP Broadstairs Ltd | Hospitality | 2024 |
| Mint VFX Limited | Professional & scientific | 2025 |
| Minter Group Ltd | Professional & scientific | 2017 |
| Mitico Homes Ltd | Real estate | 2025 |
| MJ Domestic Plumbing & Heating Limited | Construction | 2021 |
| MJ REN Limited | Energy | 2016 |
| MJW Consulting (S.E.) Limited | Professional & scientific | 2021 |
| MK Hoyse Ltd | Hospitality | 2024 |
| MK Landscape and Design Limited | Administrative & support | 2024 |
| MK Sweepers Ltd | Transport & logistics | 2024 |
| MMM Concrete Limited | Construction | 2019 |
| Mojo Mind Limited | Health & social care | 2026 |
| Moonride Ltd | Transport & logistics | 2025 |
| Moovio Limited | Real estate | 2020 |
| Morgan Energy Consultancy Services Ltd | Professional & scientific | 2016 |
| Morgan Jones Limited | Administrative & support | 2002 |
| Morning Breeze Limited | Health & social care | 2012 |
| Mosbo Design Limited | Construction | 2022 |
| Mothers Meeting Limited | Professional & scientific | 2013 |
| MPS Consulting & Events Ltd | Administrative & support | 2024 |
| MR DOT Limited | Arts & recreation | 2025 |
| MRT Rentals Ltd | Real estate | 2024 |
| MS Fundraising Ltd | Administrative & support | 2025 |
| MSG Custom Audio Limited | Wholesale & retail | 2015 |
| Msp+D Ltd | Professional & scientific | 2020 |
| Mulberry Abodes and Consultancy (MAC) Limited | Real estate | 2017 |
| Mullally Ltd | Professional & scientific | 2018 |
| Mumps Oldham Limited | Construction | 2019 |
| MW Maintenance (Kent) Ltd | Construction | 2015 |
| My Coaching and Consulting Limited | Professional & scientific | 2018 |
| Myriad Music Ltd | Arts & recreation | 2019 |
| Mythologie Ltd | Other services | 2023 |
| N & S Design Solutions Limited | Professional & scientific | 2003 |
| N F a Architects Limited | Professional & scientific | 2007 |
| N&C Agile Developments Ltd | Professional & scientific | 2022 |
| NAJ Turkish Restaurant Ltd | Hospitality | 2024 |
| Nakhawa Ltd | Information & communication | 2024 |
| Nanoblox Limited | Information & communication | 2021 |
| Naps (UK) Ltd | Other services | 2011 |
| Narc&Co Ltd | Health & social care | 2021 |
| Naregal Ltd | Health & social care | 2022 |
| Nature Cure Hub Limited | Health & social care | 2024 |
| Naveed & Sons Limited | Wholesale & retail | 2015 |
| NB Tech Engineering Limited | Information & communication | 2025 |
| Need Financial Planning Ltd | Financial services | 2017 |
| Nel’S Carpet Cleaning Ltd | Administrative & support | 2021 |
| Nemay Limited | Real estate | 2016 |
| Neptune and Back Films Limited | Information & communication | 2026 |
| Neptune Games Ltd | Information & communication | 2026 |
| Nera Competitions Ltd | Professional & scientific | 2024 |
| Netfluid Limited | Information & communication | 2023 |
| New Beginnings (IOT) Ltd | Administrative & support | 2013 |
| New Friendly House Limited | Hospitality | 2021 |
| Nexus Visual Limited | Professional & scientific | 2019 |
| Nick Hensher Limited | Professional & scientific | 2016 |
| Niewidzialni. Usłysz Mnie CIC | Administrative & support | 2026 |
| Nightingale Wealth Advisory Limited | Financial services | 2005 |
| Nils Solutions Limited | Information & communication | 2021 |
| Nimaco Kent Limited | Hospitality | 2018 |
| Nipon Food Express Limited | Hospitality | 2010 |
| Nkechi Okorocha Ltd | Professional & scientific | 2009 |
| NLO Associates Limited | Professional & scientific | 2024 |
| NO 1 Sowell Street Management Company Limited | Extraterritorial | 2026 |
| NO 4 Westbrook Gardens Management Company Limited | Households | 2008 |
| NO.5 Beer Company Ltd | Wholesale & retail | 2021 |
| Noble Writing & Consultancy Ltd | Professional & scientific | 2011 |
| Noblevfx Limited | Information & communication | 2023 |
| NOO Ventures Limited | Real estate | 2026 |
| NOPRESSURE22 Limited | Administrative & support | 2026 |
| Norfolk Forklift Training Limited | Extraterritorial | 2024 |
| Northdownhill Cafe Ltd | Hospitality | 2026 |
| Northumberland Mews Limited | Real estate | 2015 |
| Novala Ltd | Professional & scientific | 2021 |