| Medicentre Sussex Ltd | Health & social care | 2024 |
| Medico Reports Ltd | Health & social care | 2008 |
| Mediflex Ltd | Wholesale & retail | 2023 |
| Medina Quay Meats Limited | Wholesale & retail | 1962 |
| Mediscience Consultancy Ltd | Professional & scientific | 2017 |
| Medway & Swale DAB Limited | Information & communication | 2021 |
| Medway Haematology Practice Ltd | Administrative & support | 2011 |
| Meeson Homes Limited | Construction | 2008 |
| Megabounce Ashford Limited | Arts & recreation | 2016 |
| Megaleio Ltd | Professional & scientific | 2025 |
| Megha Architecture Ltd | Information & communication | 2024 |
| Mehra Capital Group Limited | Financial services | 2025 |
| Mehrabani | Other services | 2021 |
| Mel-Dannie Global Resources Ltd | Wholesale & retail | 2012 |
| Melan & COA Limited | Financial services | 2020 |
| Melanie Ashford Ltd | Wholesale & retail | 2024 |
| Meldensi Property Ltd | Real estate | 2021 |
| Melia Consulting Limited | Administrative & support | 2008 |
| Melladome Limited | Wholesale & retail | 2020 |
| Melluish & Davis Associates Ltd | Other services | 2004 |
| Meloc Ltd | Information & communication | 2017 |
| Melvin Head Carpets Limited | Administrative & support | 2005 |
| Memow Limited | Arts & recreation | 2014 |
| Mendabath (U.K.) Limited | Construction | 1983 |
| Mendes Transport Ltd | Transport & logistics | 2016 |
| Mentor Education Services Limited | Administrative & support | 2001 |
| Menuanalyser Ltd | Information & communication | 2014 |
| Menyl Ltd | Information & communication | 2026 |
| Menzies Energy LLP | | 2011 |
| Mepa Commerce Ltd | Wholesale & retail | 2026 |
| Mepw Limited | Financial services | 2020 |
| Mercantile Overseas Trading Limited | Manufacturing | 1940 |
| Mercato Limited | Professional & scientific | 1999 |
| Merchexpress Ltd | Administrative & support | 2022 |
| Mercury Cars (Ashford) Limited | Wholesale & retail | 1994 |
| Mercury Windows Limited | Construction | 1995 |
| Mercy and Co Limited | Wholesale & retail | 2026 |
| Merida Energy Advisors Ltd | Professional & scientific | 2020 |
| Meridian Hill Financial Consultancy Limited | Construction | 2019 |
| Meritronics Limited | Manufacturing | 1973 |
| Meritum Integrated Care LLP | | 2013 |
| Mero Mole Brands Ltd | Professional & scientific | 2025 |
| Merot Holdings Limited | Financial services | 2021 |
| Merrywood Farm Limited | Agriculture & fishing | 2012 |
| Mersham Business Solutions Ltd | Information & communication | 2004 |
| Mervic Nath Ltd | Transport & logistics | 2021 |
| Meryash Consulting Limited | Administrative & support | 2010 |
| Meshandpest Ltd | Wholesale & retail | 2024 |
| Messer Group Holdings Ltd | Professional & scientific | 2021 |
| Metallicum Solutions Limited | Construction | 2023 |
| Metals for Industrial Chemistry Limited | Wholesale & retail | 2015 |
| Metalwork Estimating Services Ltd | Construction | 2023 |
| Metcc Solutions Ltd | Professional & scientific | 2019 |
| Metend Limited | Real estate | 2019 |
| Meterlube Systems Limited | Manufacturing | 1996 |
| Method Systems Ltd. | Information & communication | 2014 |
| Metis Films Limited | Information & communication | 2024 |
| Metromark Ltd | Administrative & support | 2024 |
| Metta Pet Clinic Ltd | Professional & scientific | 2024 |
| Meşoglu Limited | Manufacturing | 2025 |
| MF Data Comms. Limited | Information & communication | 2001 |
| MF Prime Ltd | Professional & scientific | 2022 |
| MG Ecoclean Ltd | Administrative & support | 2025 |
| MG Taxi Ltd | Transport & logistics | 2023 |
| MG Working Solutions Ltd | Professional & scientific | 2024 |
| MG3 Environmental Limited | Construction | 2013 |
| MGD Holdings Limited | Financial services | 2016 |
| MGF Investments Limited | Information & communication | 2011 |
| MGI Electrical Limited | Construction | 2004 |
| MGM Steel Fabrication Ltd | Manufacturing | 2024 |
| MGM Steel Limited | Manufacturing | 2025 |
| MGO Cares Limited | Health & social care | 2022 |
| MGW Financial Ltd | Financial services | 2024 |
| MH Associates Training Ltd | Education | 2023 |
| MH Street Services Limited | Construction | 2016 |
| MH70 Ltd | Education | 2024 |
| MHC COG Ltd | Administrative & support | 2026 |
| MHD Painting & Decorating Contractors Ltd | Construction | 2020 |
| Micah Care Limited | Health & social care | 2013 |
| Micarta Ltd | Construction | 2018 |
| Michael Barnes Building Limited | Construction | 2015 |
| Michael Bass Ltd | Construction | 2024 |
| Michael Daly Associates Limited | Professional & scientific | 2007 |
| Michael Joyce Property Ltd | Real estate | 2001 |
| Michael Keeley (Agri Services) Limited | Administrative & support | 2003 |
| Michael Neil Builders Ltd | Construction | 2017 |
| Michael Odei Limited | Health & social care | 2025 |
| Michael Pankhurst Accountants Ltd. | Professional & scientific | 2011 |
| Michael Wood Electrical Limited | Construction | 2017 |
| Michiancy Ltd | Health & social care | 2023 |
| Michmagconsult Limited | Information & communication | 2023 |
| Mickelborough Ltd | Financial services | 2026 |
| Microcare Technologies Ltd | Information & communication | 2012 |
| Micromarvel Limited | Information & communication | 2010 |
| Microwave Service Company Ltd | Manufacturing | 2007 |
| MID - Woodcreations Ltd | Professional & scientific | 2025 |
| MID Kent Fisheries Limited | Agriculture & fishing | 2002 |
| MID Kent Resin Finish Limited | Construction | 2020 |
| MID Kent Tools and Fixings Limited | Wholesale & retail | 2008 |
| Middle Park Cottages Limited | Hospitality | 2022 |