| Luckgreen Limited | Agriculture & fishing | 1983 |
| Lucy Clark Consulting Limited | Administrative & support | 2024 |
| Lucy Embroidery Ltd | Manufacturing | 2019 |
| Ludlow Welding Ltd | Construction | 2019 |
| Luli Gardens Ltd | Administrative & support | 2021 |
| Lunara Consultancy Ltd | Construction | 2025 |
| Lunara Vision Ltd | Construction | 2025 |
| Luncheon Limited | Hospitality | 2025 |
| Lush by Lottie Training Academy Limited | Education | 2026 |
| LVR Beauty Limited | Other services | 2026 |
| LX Communications Limited | Wholesale & retail | 1998 |
| M & a Trade Solutions Limited | Wholesale & retail | 2025 |
| M & C Real Estate Ltd | Real estate | 2022 |
| M & D Building Services Ltd. | Construction | 1993 |
| M & P Dunn Construction Limited | Construction | 2015 |
| M & S Developments (GB) Limited | Professional & scientific | 2004 |
| M C Works Ltd | Professional & scientific | 2013 |
| M J Lewis & SON (Boat Sales) Limited | Wholesale & retail | 1998 |
| M Kruse Limited | Administrative & support | 2021 |
| M P Construction Builders Limited | Construction | 2014 |
| M Yarham Holdings Ltd | Construction | 2025 |
| M. F. T. C. Ltd | Administrative & support | 2023 |
| M.B. Surfacing Limited | Construction | 2001 |
| M.J. Ventham & Co Limited | Extraterritorial | 2003 |
| M1 Nails Heybridge Ltd | Other services | 2025 |
| Maas Spice Ltd | Hospitality | 2026 |
| MAC Tools Burnley Limited | Wholesale & retail | 2022 |
| Macadamac Surfaces Limited | Construction | 2018 |
| Macanta Group Ltd | Professional & scientific | 2018 |
| Mackenzie Development Projects (One) Limited | Construction | 2022 |
| Mackenzie Development Projects Limited | Construction | 2022 |
| Mackenzie Living (Esher) Ltd | Construction | 2021 |
| Mackenzie Living (Folkestone) Ltd | Construction | 2021 |
| Mackenzie Living Limited | Construction | 2019 |
| Macklin House Management Company Limited | Households | 1997 |
| Macnev Limited | Wholesale & retail | 2023 |
| Madder GEM Properties Limited | Real estate | 2024 |
| Madison Capital Limited | Administrative & support | 2021 |
| MAF Business Solutions Limited | Professional & scientific | 2026 |
| Mahady Consulting Limited | Professional & scientific | 2020 |
| Maisyshub Ltd | Health & social care | 2022 |
| Makyra Communications Ltd | Information & communication | 2022 |
| Maldon & District Community Voluntary Service | Administrative & support | 2001 |
| Maldon & Tiptree Football Club Limited | Arts & recreation | 2010 |
| Maldon & Tiptree Plastering Ltd | Construction | 2022 |
| Maldon and District Citizens Advice Bureau | Health & social care | 2011 |
| Maldon BGE Limited | Financial services | 2026 |
| Maldon Building Services (Maintenance Division) Ltd | Extraterritorial | 2007 |
| Maldon Building Services Limited | Construction | 1999 |
| Maldon Car Sales Ltd | Wholesale & retail | 2019 |
| Maldon Car Wash Ltd | Other services | 2023 |
| Maldon Cars & Vans Ltd | Wholesale & retail | 2020 |
| Maldon Commercials Limited | Wholesale & retail | 2018 |
| Maldon Community Pre-School | Education | 2009 |
| Maldon Design Limited | Professional & scientific | 2012 |
| Maldon Fire Safety Limited | Construction | 2024 |
| Maldon Fish & Chips Limited | Hospitality | 2023 |
| Maldon Fish Ltd | Hospitality | 2019 |
| Maldon Foot Clinic Limited | Health & social care | 2014 |
| Maldon GIG Rowing Club CIC | Arts & recreation | 2020 |
| Maldon Gymnastics Club Ltd | Arts & recreation | 2023 |
| Maldon Holdings Limited | Financial services | 2024 |
| Maldon Housing Association Limited | Real estate | 2006 |
| Maldon Interiors Ltd | Professional & scientific | 2023 |
| Maldon Kebab & Pizza Ltd | Hospitality | 2025 |
| Maldon Kebab Limited | Hospitality | 2025 |
| Maldon Lettings Limited | Other services | 2008 |
| Maldon Loft Services Ltd | Construction | 2025 |
| Maldon Lofts Limited | Construction | 2022 |
| Maldon Machinery Services Limited | Manufacturing | 2024 |
| Maldon Maki Limited | Hospitality | 2025 |
| Maldon Marine Limited | Manufacturing | 1960 |
| Maldon Masonic Hall Limited | Hospitality | 2002 |
| Maldon Mechanical Engineers Ltd | Professional & scientific | 2024 |
| Maldon Nails Ltd | Other services | 2013 |
| Maldon Rapid Repair Ltd | Construction | 2026 |
| Maldon Rays Limited | Other services | 2022 |
| Maldon Reclamation Limited | Construction | 2025 |
| Maldon Roofing Contractors Limited | | 1996 |
| Maldon Shot Blasting & Powder Coating Ltd | Manufacturing | 2004 |
| Maldon Skin Clinic Ltd | Other services | 2021 |
| Maldon Tandoori Restaurant Ltd | Hospitality | 2021 |
| Maldon Taxi Limited | Transport & logistics | 2024 |
| Maldon Timber & Mouldings Ltd | Manufacturing | 2023 |
| Maldon United Football Club Limited | Education | 2023 |
| Malik Group of Business Ltd | Wholesale & retail | 2020 |
| Maltel Ltd | Health & social care | 2015 |
| Mamma Italia Ltd | Wholesale & retail | 2021 |
| Mane Hairdresser Ltd | Other services | 2023 |
| Mannequin Interiors Ltd | Wholesale & retail | 2022 |
| Mannin Veen Associates Ltd | Professional & scientific | 2006 |
| Manning Amusements Limited | Arts & recreation | 2024 |
| Manning Organisation Limited | Arts & recreation | 2024 |
| Mannings Amusements Limited | Arts & recreation | 2001 |
| Mannings International Limited | Arts & recreation | 2023 |
| Mannings Organisation Limited | Administrative & support | 1989 |
| Manningtree Maintenance Limited | Construction | 2024 |
| Mans Best Friend Dog Care Ltd | Other services | 2026 |
| Marble Events Ltd | Wholesale & retail | 2011 |
| Marc Antoni (Bracknell) Limited | Other services | 2013 |