| Luke Triggs Bathrooms Limited | Manufacturing | 2012 |
| Luna MAE London Limited | Manufacturing | 2012 |
| Lunney Communications Ltd | Professional & scientific | 2005 |
| Luppitt Commons Limited | Real estate | 2022 |
| Luppitt Landscape Partnership CIC | Professional & scientific | 2024 |
| LW Psychology Ltd | Health & social care | 2013 |
| Lydgate Trading Post Ltd | Wholesale & retail | 2003 |
| Lyme Regis Sailing Club Limited | Other services | 2010 |
| Lynch Motor Company Limited | Manufacturing | 2002 |
| Lynden Properties (U.K.) Limited | Real estate | 1983 |
| Lyndsay Haines Ltd. | Information & communication | 2012 |
| M & D Keywood Plumbing Limited | Construction | 2018 |
| M D Pyle Limited | Agriculture & fishing | 2011 |
| M Dayment Construction Limited | Construction | 2025 |
| M G Webber West Country Grown Limited | Wholesale & retail | 2013 |
| M N Design Consultancy Limited | Construction | 2015 |
| M Raynor Crop Consultants Limited | Agriculture & fishing | 2003 |
| M Salter & SON Limited | Agriculture & fishing | 2015 |
| M'N R Mowers Limited | Manufacturing | 2004 |
| M.A. Witcombe Limited | Construction | 2007 |
| Machinery Masters Limited | Wholesale & retail | 2025 |
| Magellan Systems Limited | Information & communication | 1994 |
| Maharajha Ltd | Hospitality | 2024 |
| Maid in Devon Ltd | Administrative & support | 2023 |
| Maiow Limited | Administrative & support | 2000 |
| Make IT in Plastics Ltd | Extraterritorial | 2014 |
| Manageable DV Community Interest Company | Health & social care | 2022 |
| Many Hands Brewery Ltd | Manufacturing | 2017 |
| Margrave Studios Limited | Real estate | 1948 |
| Mark Hill Plumbing & Heating Limited | Construction | 2013 |
| MARK1 Conversions Ltd | Other services | 2005 |
| Marketing Chameleon Limited | Other services | 2018 |
| Martha Mockford Limited | Manufacturing | 1984 |
| Martin Summers Building Ltd | Construction | 2016 |
| Masonelle Ltd | Professional & scientific | 2025 |
| Matthew Hopper Films Limited | Information & communication | 2017 |
| Maude & Claude Limited | Wholesale & retail | 2022 |
| Mayfair Stone (SW) Ltd | Wholesale & retail | 2025 |
| MBA Energy Limited | Professional & scientific | 2015 |
| Meadows Crescent Management Limited | Households | 1984 |
| Melody Lane Records Limited | Information & communication | 2025 |
| Merrett Survey Limited | Professional & scientific | 2007 |
| Merritt Homes Limited | Real estate | 2003 |
| Mezinska Ltd | Health & social care | 2019 |
| MGB Waste Services Limited | Other services | 2019 |
| MHJ Properties Southwest Limited | Real estate | 2018 |
| Michael Pidsley Limited | Wholesale & retail | 2003 |
| Michael`S House of Hair Limited | Other services | 2008 |
| Micksan Consultancy Limited | Administrative & support | 2015 |
| Migolf Ltd | Wholesale & retail | 2023 |
| Miko Property (SW) Ltd | Real estate | 2025 |
| Milkshed Catering Limited | Hospitality | 2016 |
| Milla Consulting Ltd | Professional & scientific | 2014 |
| Millstock Limited | Real estate | 2007 |
| Millwood Homes (Norfolk) Limited | Construction | 2020 |
| Mirador Escapes Limited | Administrative & support | 2024 |
| MJL Mortgages Limited | Financial services | 2020 |
| Mjolnir Electrical Limited | Other services | 2017 |
| MK Soil Science Ltd | Professional & scientific | 2014 |
| MM New Natural Enhancement Ltd | Other services | 2025 |
| MN Professional Ltd | Professional & scientific | 2019 |
| MN Services Coxley Limited | Professional & scientific | 2009 |
| MO Trucks (SW) Ltd | Wholesale & retail | 2026 |
| Moonset Limited | Construction | 2005 |
| Moshulu Limited | Extraterritorial | 2000 |
| Moss Consulting Ltd | Professional & scientific | 2023 |
| Motor Metrics Ltd | Information & communication | 2026 |
| Mount Pleasant Business Park Ltd | Real estate | 2025 |
| Mouse of Cards Limited | Manufacturing | 2001 |
| Mousey Cottages (Wood Street) Maintenance Company Limited | Real estate | 1984 |
| Move Forward Gym Ltd | Arts & recreation | 2020 |
| MR Medical Aesthetics Ltd | Other services | 2025 |
| Mscl Limited | Professional & scientific | 2016 |
| MST Auctioneers Limited | Professional & scientific | 2008 |
| MTB Builders Ltd | Construction | 2020 |
| Mulberry Landscaping (South West) Limited | Administrative & support | 2019 |
| Multiform Technologies Limited | Administrative & support | 2003 |
| Mwpedwards Ltd | Education | 2023 |
| My Asset Management Limited | Real estate | 2015 |
| My E - Coach Limited | Extraterritorial | 2004 |
| My London Parts Ltd | Wholesale & retail | 2019 |
| Mye-Mentor Limited | Extraterritorial | 2006 |
| Mystrongbox Ltd | Administrative & support | 2017 |
| Naaduk Limited | Other services | 2014 |
| Naaduk Training Academy Limited | Professional & scientific | 2023 |
| Naomi Cleaver Limited | Professional & scientific | 2004 |
| NAP Quantity Surveying Ltd. | Professional & scientific | 2016 |
| Natural Choice Ltd | Wholesale & retail | 2023 |
| NDM Commercial Ltd | Professional & scientific | 2012 |
| Nelsonfox Ltd | Administrative & support | 2024 |
| Netcell Asset Management Limited | Administrative & support | 2011 |
| Netcell Solutions Limited | Information & communication | 2011 |
| New Street Garage Limited | Wholesale & retail | 2009 |
| Newcott Dairy Ltd | Agriculture & fishing | 2021 |
| News and Media Republic Limited | Information & communication | 2006 |
| Newscraft Limited | Information & communication | 2015 |
| NG Executive Support Ltd | Administrative & support | 2024 |
| Nilton Ltd | Hospitality | 2025 |
| Nitulescu Ltd | Health & social care | 2012 |
| NJ Thornton Ltd | Construction | 2024 |