| LM Forestry Ltd | Agriculture & fishing | 2012 |
| Lmsevents Ltd | Hospitality | 2023 |
| Lochinger Properties Limited | Real estate | 2023 |
| Logix Surveying Limited | Professional & scientific | 2021 |
| Loma Properties Limited | Construction | 2024 |
| London AC Properties Ltd | Real estate | 2025 |
| London and Kent Safetytraining at Ltd | Education | 2015 |
| London Clock Company Limited | Wholesale & retail | 1967 |
| London Clock Holding Company Limited(The) | Professional & scientific | 1983 |
| London Piano Forte Network Limited | Arts & recreation | 2018 |
| London Watch Company Limited | Wholesale & retail | 1948 |
| Long Game Business Networking Ltd | Administrative & support | 2025 |
| Lovesport Limited | Construction | 2012 |
| Lowparsto Ltd | Professional & scientific | 2020 |
| LP Plumbing and Heating Ltd | Construction | 2019 |
| LRB Electrical & Renewables Ltd | Construction | 2023 |
| Lukesfield Aero Services Limited | Manufacturing | 2019 |
| Lumino Electrical Ltd | Construction | 2012 |
| Luminova Energies Limited | Administrative & support | 1998 |
| Lunar Aesthetics by SAM Limited | Other services | 2025 |
| Lunsford Limited | Real estate | 2021 |
| LW Lighting Ltd | Administrative & support | 2020 |
| Lymphoedema United Ltd | Information & communication | 2021 |
| M & J Lawson LLP | | 2026 |
| M & R Consulting Limited | Professional & scientific | 2005 |
| M C Group Limited | Wholesale & retail | 1986 |
| M E B Design Limited | Professional & scientific | 2008 |
| M G Healthcare Ltd | Health & social care | 2007 |
| M O International LLP | | 2009 |
| M Woven Limited | Manufacturing | 2018 |
| M Z Engineering Limited | Construction | 2005 |
| M-Tech Motorworks Ltd | Wholesale & retail | 2026 |
| M.B.E. Engineering Supplies (Kent) Limited | Wholesale & retail | 1975 |
| M.H. Viserv Ltd | Professional & scientific | 2026 |
| M.Orengo Ltd | Information & communication | 2025 |
| M2 Building Solutions Kent Ltd | Construction | 2023 |
| Macgregor Insurance Brokers Ltd | Financial services | 2022 |
| Mactec Faultless Ltd | Construction | 2017 |
| Maggam Limited | Transport & logistics | 2001 |
| Magical Phoenix 2025 Limited | Hospitality | 2025 |
| Maidstone Electrical Contractors Limited | Construction | 2013 |
| Maidstone Home Care Limited | Health & social care | 2010 |
| Maidstone Photographic Services Limited | Professional & scientific | 2009 |
| Maidstone Signs Asset Management Ltd | Financial services | 2015 |
| Maidstone Signs Limited | Manufacturing | 1971 |
| Maiford MBO Ltd | Construction | 2019 |
| Malbun Limited | Information & communication | 2025 |
| Mallon Publishing Ltd | Information & communication | 2022 |
| Managed Technology Corporation Ltd | Administrative & support | 2013 |
| Mann Consultancy Ltd | Administrative & support | 2019 |
| Mara Property Group Ltd | Real estate | 2025 |
| Mara Property Services Ltd | Construction | 2022 |
| Marcela Associates Ltd | Professional & scientific | 2017 |
| Marcela Building Solutions Ltd | Construction | 2020 |
| Marine Gardens Management Company Ltd | Real estate | 2024 |
| Martha Fitzgerald Consultancy Limited | Professional & scientific | 2020 |
| MAS Evolution Limited | Arts & recreation | 2025 |
| Matching Green Consultants Limited | Professional & scientific | 2019 |
| Mateo (UK) Limited | Extraterritorial | 2015 |
| Matrick Co Ltd | Construction | 2019 |
| Matthews Commissioning Ltd | Construction | 2023 |
| Maude Properties Limited | Real estate | 2019 |
| Mawson Allen Ltd | Administrative & support | 2020 |
| Maximum Ideas Limited | Professional & scientific | 2017 |
| MB General Builders Limited | Construction | 2017 |
| MC Rental Limited | Administrative & support | 1989 |
| Mccoppin & Brown Sports Horses Ltd | Wholesale & retail | 2024 |
| MCD Associates Limited | Professional & scientific | 2001 |
| MCG (Holdings) Ltd | Wholesale & retail | 2009 |
| MCK Elite Security Limited | Administrative & support | 2018 |
| Mckarlen Limited | Wholesale & retail | 2016 |
| Mcneill Holdings Ltd | Financial services | 2024 |
| MDH Security Services Ltd | Manufacturing | 2023 |
| ME2U Valeting and Detailing Ltd | Other services | 2023 |
| Mec-Fix Limited | Manufacturing | 2026 |
| Medi Cover Ltd | Health & social care | 2023 |
| Media NOW Limited | Information & communication | 2017 |
| Mediaatmos Ltd. | Information & communication | 2018 |
| Medical Transportation Devices Limited | Transport & logistics | 2024 |
| Medway House Boats Limited | Manufacturing | 2018 |
| Meeral Limited | Health & social care | 2003 |
| Megamix Ltd | Hospitality | 2018 |
| Mehe Limited | Hospitality | 2022 |
| Melad Takeaway Ltd | Hospitality | 2019 |
| Melrich Limited | Construction | 2002 |
| Menomoney Ltd | Education | 2022 |
| MEP (Aeroplastics) Limited | Manufacturing | 2021 |
| MEP (Special Projects) Limited | Manufacturing | 2005 |
| MEP Group Limited | Manufacturing | 2006 |
| MEP Ltd | Manufacturing | 1976 |
| MER Catering Limited | Hospitality | 2017 |
| Meredith Traffic Management Limited | Construction | 2016 |
| Mericor Holding Limited | Information & communication | 2008 |
| Merrals Shaw Limited | Administrative & support | 2020 |
| Metapixels Ltd | Information & communication | 2022 |
| MI BIO Products Ltd | Wholesale & retail | 2021 |
| Microspot Limited | Information & communication | 1964 |
| Mikel Group Ltd | Financial services | 2023 |
| Millers Field Management Limited | Households | 2002 |
| Mimi Global Ltd | Wholesale & retail | 2023 |