| Leweston Farm LLP | | 2006 |
| Leweston School (Sherborne) Limited | Education | 2025 |
| Liberty Orchards Limited | Agriculture & fishing | 2010 |
| Lifehouse Feng Shui Ltd | Extraterritorial | 2022 |
| Lifted Imaging Ltd | Professional & scientific | 2017 |
| Linen Ltd | Manufacturing | 2025 |
| Little Fones Landscapes Limited | Administrative & support | 2021 |
| Little Tidcombe Farm LVA LLP | | 2017 |
| Little Venice Developments Limited | Construction | 2013 |
| Littler Pepper Holdings Ltd | Financial services | 2019 |
| Live Loads Media Ltd | Information & communication | 2026 |
| Livingstone Leisure Holdings Limited | Financial services | 2023 |
| Livingstone Leisure Limited | Arts & recreation | 2011 |
| Llore Productions Ltd | Information & communication | 2013 |
| LM1 Accountancy Limited | Professional & scientific | 2009 |
| Lobster Communications Limited | Professional & scientific | 2002 |
| Lodge Hill Communications Ltd | Professional & scientific | 2014 |
| Lolly Limited | Professional & scientific | 2002 |
| Londonderry Administrative Services Limited | Real estate | 1953 |
| Londonderry Property Services Limited | Real estate | 2009 |
| Longdog Shepherd Huts Limited | Manufacturing | 2023 |
| Looe LVA LLP | | 2021 |
| Lopen LVA LLP | | 2015 |
| Lovaan Limited | Other services | 2022 |
| LS Flooring Sherborne Ltd | Wholesale & retail | 2023 |
| Lucky Day Projects Ltd | Information & communication | 2024 |
| Lucky Fiver Limited | Financial services | 2024 |
| Lumaya Ltd | Arts & recreation | 2025 |
| Luminis Marketing Limited | Professional & scientific | 2019 |
| Luna Electrical Services Ltd | Construction | 2016 |
| Lupi Properties Limited | Administrative & support | 2012 |
| Lyons Gate Contracting Services Limited | Administrative & support | 2018 |
| M & R Yeatman Ltd | Agriculture & fishing | 2019 |
| M G FOX Plastering Ltd | Construction | 2026 |
| M J R Roofing & Construction Ltd | Construction | 2019 |
| M R Tizzard Limited | Agriculture & fishing | 2008 |
| M Scaffolding & Brickwork Ltd | Construction | 2025 |
| Macintosh Antiques Ltd. | Wholesale & retail | 2013 |
| Madris Consulting Limited | Manufacturing | 2024 |
| Magrose Consulting Ltd | Professional & scientific | 2018 |
| MAJESTY7 Ltd | Manufacturing | 2012 |
| Make Structures Consulting Engineers Ltd | Professional & scientific | 2021 |
| Mallard Productions Limited | Extraterritorial | 2017 |
| Maltings Management (NO. 1) Limited(The) | Real estate | 1985 |
| Manor Court (1 - 28) RTM Company Limited | Households | 2025 |
| Manor Court (29 - 30) RTM Company Limited | Households | 2025 |
| Manor Farm Country House Management Company Limited | Real estate | 1996 |
| Manston LVA LLP | | 2015 |
| Manual Investing Limited | Real estate | 1993 |
| MAP Editions Limited | Arts & recreation | 2024 |
| Maple Estates Limited | Real estate | 1968 |
| Marcel Limited | Professional & scientific | 2017 |
| Marchgem Limited | Manufacturing | 2014 |
| Marglass Limited | Extraterritorial | 1990 |
| Mark Beard Painting & Decorating Specialist Limited | Construction | 2003 |
| Mark Lovatt Associates Limited | Information & communication | 2009 |
| Marketing Numbers Limited | Professional & scientific | 2002 |
| Marlborough LVA LLP | | 2017 |
| Marmalade Starfish Ltd | Professional & scientific | 2012 |
| Marsh Keene Limited | Professional & scientific | 2022 |
| Marston Care Limited | Health & social care | 2008 |
| Martin Worley Limited | Construction | 2021 |
| Martock LVA LLP | | 2017 |
| Marvin FOX Limited | Extraterritorial | 2023 |
| Mary Phillip Fergus Ltd | Wholesale & retail | 2016 |
| Mason Civils Ltd | Construction | 2025 |
| Matengen Holdings Ltd | Professional & scientific | 2025 |
| Mathas Food Products Sherborne Ltd | Manufacturing | 2025 |
| Matthew Roskell Antiques Ltd | Wholesale & retail | 2017 |
| Matthews Properties Limited | Construction | 2003 |
| Mayer Films Ltd | Arts & recreation | 2012 |
| Mayflower Logistics Ltd | Transport & logistics | 2022 |
| Mccullagh Limited | Extraterritorial | 2013 |
| Mcdermott Marketing Ltd | Extraterritorial | 2020 |
| Mdmcc Ltd | Professional & scientific | 2017 |
| ME My Selfemployment Ltd | Professional & scientific | 2024 |
| Mead Court Management Company 1999 Limited | Real estate | 1999 |
| MEDIATION4CONSTRUCTION Limited | Professional & scientific | 2013 |
| Medtourelite Ltd | Information & communication | 2024 |
| Melbury Gallery Limited | Wholesale & retail | 2003 |
| Mendips Raceway Limited | Arts & recreation | 2000 |
| Merefield & Henstridge Limited | Other services | 2001 |
| Meridian Planning Limited | Professional & scientific | 2025 |
| Merlin Spirit Ltd | Wholesale & retail | 2020 |
| Merriott Garden Centre LVA LLP | | 2017 |
| Merriott LVA LLP | | 2015 |
| Merymar Limited | Construction | 2012 |
| Merys Hopkins Limited | Professional & scientific | 2017 |
| MG Textiles Ltd | Manufacturing | 2016 |
| Michelle Lewis Communications Ltd | Professional & scientific | 2018 |
| Mid-Wessex Investigations Limited | Administrative & support | 2005 |
| Middle Brother Ltd | Arts & recreation | 2015 |
| Middle Farm Holidays Ltd | Hospitality | 2012 |
| Midwest Office Equipment Limited | Wholesale & retail | 2010 |
| Midwest the Stationers Ltd | Wholesale & retail | 2026 |
| Milborne Construction Ltd | Construction | 2025 |
| Milborne Port Pharmacy Limited | Wholesale & retail | 2008 |
| Mill House Trees Limited | Agriculture & fishing | 2023 |
| Milli Molli Mandi Limited | Wholesale & retail | 2024 |
| Millie Pilkington Limited | Professional & scientific | 2011 |