| Maple Gardens (Tunbridge Wells) Management Limited | Households | 2006 |
| Maple Management Limited | Administrative & support | 1998 |
| Maple Planning & Development Ltd | Professional & scientific | 2018 |
| Mapleridge Actuarial Limited | Financial services | 2018 |
| Mapple (UK) Limited | Professional & scientific | 2013 |
| Marese Langan Ltd | Other services | 2008 |
| Marevco Limited | Administrative & support | 2012 |
| Margin 1ST Ltd | Professional & scientific | 2019 |
| Maria Parker Limited | Professional & scientific | 2023 |
| Marie Coleman Consulting Ltd | Professional & scientific | 2025 |
| Marine Cargo Surveys Limited | Financial services | 2016 |
| Mariners Consultants Limited | Professional & scientific | 2020 |
| Mariners Enterprises LLP | | 2020 |
| Marinos Fish & Chips Ltd | Hospitality | 2017 |
| Marinski Limited | Wholesale & retail | 2026 |
| Mark Adam Limited | Wholesale & retail | 2002 |
| Mark Court Freehold Limited | Other services | 2007 |
| Mark Nicholson Consulting Limited | Professional & scientific | 2018 |
| Market Data Services Limited | Information & communication | 1995 |
| Market Quarter Phase 3 (Tonbridge) Management Limited | Households | 2008 |
| Marketing Drive Ltd | Professional & scientific | 2020 |
| Marley Dance Floors Limited | Extraterritorial | 2014 |
| Marram Capital Limited | Financial services | 2023 |
| Marshall Court (Anerley) RTM Company Limited | Households | 2013 |
| Martha Homes Limited | Real estate | 2023 |
| Martin Hulbert Design Limited | Professional & scientific | 2010 |
| Martin Plastering Contractors Ltd | Construction | 2009 |
| Martinair Air Conditioning Limited | Construction | 2006 |
| Martins Mews Residents Company Limited | Households | 2010 |
| Marvellous Mums Limited | Other services | 2017 |
| Mary Mary Creates Gardens Ltd | Administrative & support | 2015 |
| Mary Mary Designs Gardens Ltd | Administrative & support | 2023 |
| Mary Mary Garden Designer Ltd. | Administrative & support | 2023 |
| Mary Pawpins Ltd | Other services | 2025 |
| Marzipan Eats Limited | Hospitality | 2021 |
| Marzipan Holdings Limited | Financial services | 2021 |
| Masaru Ventures Ltd | Wholesale & retail | 2025 |
| Masethu Limited | Construction | 2014 |
| Maslins EOT Limited | Professional & scientific | 2021 |
| Maslins Limited | Professional & scientific | 2010 |
| Mason Consulting Ltd | Information & communication | 1994 |
| Mason Homes Development Ltd | Construction | 2019 |
| Masrani Enterprises Limited | Wholesale & retail | 2001 |
| Masse Consulting Ltd | Professional & scientific | 2026 |
| Master of Malt Limited | Manufacturing | 2018 |
| Master Plaster Pros Limited | Construction | 2025 |
| Masterlead Ltd | Information & communication | 2024 |
| Mastermind Tours Ltd | Information & communication | 2014 |
| Matfield Fruit Supplies Ltd | Real estate | 1983 |
| Matharoo Capital Ltd | Real estate | 2021 |
| Matilda Burn Ceramics Limited | Other services | 2025 |
| Matt Adamson Coaching and Consultancy Limited | Professional & scientific | 2024 |
| Matt Beevor Ltd | Professional & scientific | 2022 |
| Mattartwork Limited | Professional & scientific | 2019 |
| Matter OUT of Place Limited | Information & communication | 2013 |
| Mattgdj Video Production Ltd | Information & communication | 2021 |
| Matthew Mountier Lighting Limited | Arts & recreation | 2008 |
| Matthew Robert Productions Limited | Information & communication | 2018 |
| Matthew Walker Photography Ltd | Professional & scientific | 2015 |
| Mattingleymakes Ltd | Wholesale & retail | 2025 |
| MAX Tuition Limited | Education | 2025 |
| MAX. Maths Co. Ltd | Education | 2022 |
| Maxillia Management Limited | Information & communication | 2006 |
| Maximartra Limited | Financial services | 2017 |
| Maxipay Accounting Services Limited | Administrative & support | 2005 |
| Maxipay International Ltd | Professional & scientific | 2001 |
| Maxipay Umbrella Ltd | Administrative & support | 2016 |
| Maxit Solutions Ltd | Information & communication | 1999 |
| Maxol Facilities Management Limited | Administrative & support | 2012 |
| Maxsports Limited | Wholesale & retail | 1996 |
| MAY Contain Nuts Productions Ltd | Arts & recreation | 2025 |
| Maya Partners Ltd | Financial services | 2018 |
| Maybourne & Russell (Tenterden) Limited | Construction | 2019 |
| Mayclair Services Limited | Administrative & support | 2012 |
| Maye Tekuta C.I.C. | Education | 2024 |
| Mayfield Vineyards Ltd | Manufacturing | 2014 |
| Mayflower Business Services SW Ltd | Administrative & support | 2024 |
| Maynard Nightingale Ltd | Construction | 2026 |
| Maynards Sanctuary Ltd | Agriculture & fishing | 2022 |
| Mays Personal Training Limited | Other services | 2008 |
| Maytech Communications Ltd | Information & communication | 1996 |
| Maythird Limited | Administrative & support | 2008 |
| Maytums Moves Limited | Transport & logistics | 2025 |
| Mayura Property Ltd | Real estate | 2018 |
| Mayvern Court Management Limited | Households | 1987 |
| Mayville Publishing Company Limited | Information & communication | 1971 |
| MB Data Solutions Ltd | Information & communication | 2023 |
| MBD Global Ltd | Information & communication | 2024 |
| MBK Solicitors Ltd | Professional & scientific | 2020 |
| MBR & Partners Ltd | Professional & scientific | 2020 |
| MC Pension Services Limited | Professional & scientific | 2020 |
| Mcarthurstonecreations Ltd | Manufacturing | 2025 |
| MCB Country Services Ltd | Administrative & support | 2019 |
| Mccabe Consulting Ltd | Professional & scientific | 2025 |
| Mccarthy Properties Limited | Construction | 1961 |
| Mccm Consulting Ltd | Professional & scientific | 2020 |
| Mccoys Property Income Limited | Real estate | 2024 |
| Mcknight Inns Limited | Hospitality | 2018 |
| Mcmaster Business Development Ltd | Professional & scientific | 2008 |
| Mcmurray Wellness Ltd | Professional & scientific | 2017 |