| Lush & Lavish Gardens Ltd | Administrative & support | 2026 |
| Lush Meadow Care Ltd | Health & social care | 2022 |
| Lusof Consulting Ltd | Professional & scientific | 2017 |
| Lusso Living Ltd. | Wholesale & retail | 2024 |
| Lutomax Financial Limited | Financial services | 2008 |
| Lutomax Holdings Limited | Financial services | 2020 |
| Luxe AC Ltd | Energy | 2025 |
| Luxe Arcane Ltd | Wholesale & retail | 2025 |
| Luxuryfinder Limited | Wholesale & retail | 2024 |
| Lyndens Accountants Ltd | Professional & scientific | 2014 |
| Lyndie Limited | Real estate | 2024 |
| Lynsted Labs Limited | Agriculture & fishing | 2019 |
| Lynsted Landscapes Ltd | Administrative & support | 2024 |
| Lyon Partners Limited | Administrative & support | 2014 |
| M & a Work Ltd | Construction | 2022 |
| M & K Facilities Limited | Administrative & support | 2025 |
| M & L Contracting Limited | Administrative & support | 2008 |
| M a B (Kent) Limited | Financial services | 2010 |
| M and S Leisure Kent Limited | Hospitality | 2012 |
| M C Attwood Limited | Agriculture & fishing | 2012 |
| M Carworld Ltd | Wholesale & retail | 2026 |
| M Curtis & SON Ltd | Construction | 2014 |
| M I Cholakov Ltd | Transport & logistics | 2018 |
| M J Technical Innovations Limited | Administrative & support | 2011 |
| M M Cleaning Services (Kent) Limited | Administrative & support | 2014 |
| M Manyonga Ltd | Health & social care | 2009 |
| M S M Accounting Services Limited | Professional & scientific | 2012 |
| M T Metalcraft Ltd | Construction | 2021 |
| M&C Properties (Kent) Ltd | Real estate | 2023 |
| M&M Bathrooms & Kitchens Ltd | Administrative & support | 2015 |
| M-Kube Limited | Professional & scientific | 2020 |
| M. Body Surfacing Limited | Construction | 2018 |
| M.G. Metals Limited | Extraterritorial | 2026 |
| M.W. Victoria Transport Limited | Transport & logistics | 2019 |
| M3 Property Investments Ltd | Real estate | 2024 |
| MAB Group Holdings Limited | Professional & scientific | 2001 |
| MAC Aesthetics Clinic Ltd | Other services | 2025 |
| MAC Campers Ltd | Administrative & support | 2022 |
| MAC Wash Limited | Extraterritorial | 2008 |
| Macair Climate Solutions Ltd | Administrative & support | 2016 |
| Macas Limited | Real estate | 2003 |
| Machinery Safety Solutions Limited | Professional & scientific | 2013 |
| Mack Consultant Limited | Other services | 2013 |
| Macnash Ltd | Information & communication | 2020 |
| Maco Door & Window Hardware (UK) Limited | Wholesale & retail | 1986 |
| Macrommune Therapeutics Ltd | Professional & scientific | 2026 |
| MAD Couriers Limited | Transport & logistics | 2025 |
| Made Possible Ltd | Construction | 2015 |
| Made to Measure Mortgages Ltd | Financial services | 2020 |
| Madeforliving Ltd | Construction | 2022 |
| Maestro Consultancy Limited | Professional & scientific | 2018 |
| MAG and SON Scaffolding Ltd | Construction | 2025 |
| Maggies Mops Ltd | Administrative & support | 2020 |
| Magic WOK Limited | Hospitality | 2022 |
| Magnified Media Ltd | Information & communication | 2024 |
| Magpie Property Investment Limited | Real estate | 1987 |
| MAH Trading Ltd | Professional & scientific | 2011 |
| Maico Ventilation UK Limited | Financial services | 2008 |
| Maidstone and Mid-Kent Motor Club Limited | Arts & recreation | 1938 |
| Maidstone Firewood Logs Ltd | Agriculture & fishing | 2025 |
| Maintain Safety Consulting Ltd | Professional & scientific | 2022 |
| Maisel Ltd | Administrative & support | 2017 |
| Maison Vert Ltd | Construction | 2017 |
| Make IT Sweet Ltd | Wholesale & retail | 2023 |
| Malc Consultancy Services Ltd | Administrative & support | 2026 |
| Maldani Ltd | Wholesale & retail | 2025 |
| Malling Technical Services Ltd | Information & communication | 2019 |
| Mama Ready Ltd | Wholesale & retail | 2026 |
| Manage Consult Ltd | Construction | 2021 |
| Mandalorian Property Limited | Real estate | 2021 |
| Manny Cutler Building & Landscape Specialist Ltd | Construction | 2025 |
| Manse Advisory & Analytics Ltd | Professional & scientific | 2026 |
| Manser & Co. Limited | Construction | 2016 |
| Manston Management Limited | Real estate | 2020 |
| Mantid Limited | Construction | 1978 |
| Mapani Ltd | Health & social care | 2025 |
| Maralyn Court (Westgate) Management Limited | Households | 1978 |
| March Services (London) Limited | Construction | 2010 |
| Mariamj Limited | Extraterritorial | 2023 |
| Mariano&Desiree Construction Ltd | Construction | 2021 |
| Marin Limited | Wholesale & retail | 2002 |
| Marine Court (Tankerton) Limited | Households | 2011 |
| Marine Parade Limited | Construction | 2021 |
| Maritime AV Limited | Professional & scientific | 2014 |
| Marius International Transport Ltd | Transport & logistics | 2012 |
| Mark James Media Ltd | Professional & scientific | 2025 |
| Marketing & Business Development Limited | Extraterritorial | 2009 |
| Marketing Events and Travel Ltd | Administrative & support | 2016 |
| Marry ME Cyprus Limited | Other services | 2016 |
| Marshlands Lettings Limited | Real estate | 2016 |
| Martin Fine Art Ltd | Information & communication | 2001 |
| MAS Car & Commercial Limited | Wholesale & retail | 2002 |
| Mase Properties Management Ltd | Real estate | 2025 |
| Mash and Mint Limited | Wholesale & retail | 2024 |
| Masters Building & Development Limited | Real estate | 2020 |
| Masters Driver Hire and Haulage Ltd | Transport & logistics | 2025 |
| Mater Mega Media Limited | Professional & scientific | 2023 |
| Material World Expos Ltd | Manufacturing | 2025 |
| Mathi Retail Ltd | Wholesale & retail | 2021 |
| Mathi Service Ltd | Wholesale & retail | 2022 |