| Molly's Wonderful World of Treats Limited | Hospitality | 2022 |
| Monarch Builders South East Ltd | Construction | 2019 |
| Monsop Limited | Wholesale & retail | 2023 |
| MOP Margate Ltd | Hospitality | 2026 |
| Morgans Margate Ltd | Hospitality | 2013 |
| Morgcambells Limited | Real estate | 2021 |
| Mori Mori Limited | Hospitality | 2022 |
| Morleystones Built Environment Ltd | Professional & scientific | 2012 |
| Morphed Ltd | Professional & scientific | 2019 |
| Morris Movers & House Clearances Ltd | Water & waste | 2026 |
| Morrison Plummers Ltd | Construction | 2014 |
| Morrison Renewables Kent Ltd | Construction | 2018 |
| MORROCISSE1985 Limited | Transport & logistics | 2026 |
| Moshi Moshi Services Ltd | Information & communication | 2019 |
| Motel Design Ltd | Professional & scientific | 2016 |
| Motmarket Ltd | Wholesale & retail | 2025 |
| Movie Media and Marketing Ltd | Information & communication | 2016 |
| Moxam Ltd | Education | 2020 |
| MPI Group Management Ltd | Real estate | 2024 |
| MR Kebab Margate Ltd | Hospitality | 2025 |
| Mr-L Support Services Ltd | Professional & scientific | 2014 |
| Mrsacorn Design's Ltd | Arts & recreation | 2023 |
| MS Carpentry and Building Solutions Ltd | Manufacturing | 2022 |
| MSK Intelligence Limited | Information & communication | 2021 |
| Mskrealty Ltd | Real estate | 2019 |
| Msmm Ltd | Health & social care | 2023 |
| MSS Lifting & Installations Ltd | Construction | 2025 |
| Mtap GAS Ltd | Construction | 2020 |
| MTC Civils Construction Limited | Water & waste | 2025 |
| Mull Club Ltd | Manufacturing | 2020 |
| Murray's General Stores Limited | Wholesale & retail | 2013 |
| MW Videos Ltd | Information & communication | 2025 |
| My Angels M.M.E Community Interest Company | Information & communication | 2024 |
| My Name IS James Limited | Professional & scientific | 2017 |
| My Teams 365 Ltd | Information & communication | 2021 |
| MYA Consultancy Services Ltd | Professional & scientific | 2020 |
| Myco Creative Limited | Administrative & support | 2025 |
| Mylamy Ltd | Manufacturing | 2025 |
| Myris Consulting Ltd | Professional & scientific | 2012 |
| N & D Bailey & Sons Ltd | Real estate | 2017 |
| NA Cleaning Solutions Ltd | Administrative & support | 2020 |
| Na-Ni Healthcare Ltd | Administrative & support | 2019 |
| NAJ Fish & Chips Ltd | Hospitality | 2025 |
| Nanopro-Tech Ltd | Information & communication | 2016 |
| Napoli Street Food Ltd | Hospitality | 2025 |
| Nash Court Farm Storage Ltd | Administrative & support | 2021 |
| Nash-Hayden Holdings Limited | Administrative & support | 2017 |
| Nasternak Properties Ltd | Real estate | 2026 |
| Nasternak Realty LLP | | 2020 |
| Nasty Touring Ltd | Arts & recreation | 2022 |
| Nasza Biedronka Margate Limited | Wholesale & retail | 2024 |
| Naturally Devine Ltd | Wholesale & retail | 2026 |
| Naya Property Investment Limited | Real estate | 2016 |
| Nayland Rock Hotel Margate Limited | Administrative & support | 2016 |
| NBE Fitness CIC | Manufacturing | 2021 |
| NC Creative CIC | Education | 2026 |
| Neat, Clean & Tidy Limited | Other services | 2018 |
| NEB Rail Ltd | Extraterritorial | 2019 |
| Neighbourhood Pilates Ltd | Other services | 2022 |
| Neil Appleton Limited | Other services | 2008 |
| Neilan Investments Ltd | Financial services | 2026 |
| Nelson Therapy Services Ltd | Health & social care | 2007 |
| Neon County Limited | Wholesale & retail | 2025 |
| NET New Marketing Ltd | Information & communication | 2026 |
| NET PAY Ltd | Wholesale & retail | 2004 |
| Netty Betty Ltd | Wholesale & retail | 2023 |
| New Margate CIC | Professional & scientific | 2013 |
| New Metro Tiling Ltd | Construction | 2025 |
| New Road Contractors Limited | Construction | 2010 |
| Newron Medical Services Limited | Health & social care | 2011 |
| Nexalease Limited | Administrative & support | 2025 |
| Nextgen AS Ltd | Information & communication | 2025 |
| Nexus Gemstones Ltd | Manufacturing | 2024 |
| NH Gambling Consultant Ltd | Professional & scientific | 2023 |
| Nice Film Market Ltd | Arts & recreation | 2018 |
| Nick Horsley Limited | Information & communication | 2015 |
| Nicole Gomez Ltd | Administrative & support | 2025 |
| Night Harvest CIC | Arts & recreation | 2022 |
| Nitl Ltd | Information & communication | 2022 |
| NJK Developments Ltd | Real estate | 2025 |
| NM Cooper Brickwork Limited | Construction | 2018 |
| NO Care Like Home. Ltd | Health & social care | 2022 |
| NO Mercy Apparel Ltd | Wholesale & retail | 2025 |
| NOB Media Limited | Information & communication | 2023 |
| Noise and Motion Limited | Professional & scientific | 2012 |
| Noka Studio Limited | Information & communication | 2024 |
| Nomadic Judo C.I.C. | Education | 2019 |
| Nomis Design Limited | Professional & scientific | 2009 |
| Noodle Swan Ltd | Other services | 2019 |
| Noon Lighting Design Limited | Construction | 2023 |
| Norfolk Heron Holdings Ltd | Real estate | 2026 |
| Normax Estates Limited | Real estate | 2016 |
| Normax Limited | Real estate | 2025 |
| Northdown Carpets Ltd | Administrative & support | 2022 |
| Northdown Carriers Limited | Transport & logistics | 2012 |
| Northdown Community Project Community Interest Company | Other services | 2010 |
| Northdown Kent Ltd | Hospitality | 2026 |
| Northdown Road Barbers Ltd | Other services | 2020 |
| Northdown Studios Ltd | Arts & recreation | 2017 |
| Northern Court (Management) Limited | Households | 1988 |