| JPL Property Limited | Real estate | 2014 |
| JPL Telecom Limited | Information & communication | 2004 |
| JT Construction Services Limited | Construction | 2018 |
| Jtec Environmental Limited | Professional & scientific | 2003 |
| Juliet Stallwood Limited | Manufacturing | 2021 |
| Justice for Children CIC | Health & social care | 2026 |
| Kaleemo Ltd | Real estate | 2020 |
| Kathizer Limited | Hospitality | 2017 |
| Kavanna Ltd | Hospitality | 2024 |
| Kemare Ltd | Financial services | 2019 |
| Kerb Ltd | Construction | 2024 |
| Kern Thorpe Ltd | Information & communication | 2026 |
| Kilburn Inn Limited | Hospitality | 2023 |
| Kingfisher Business Associates Limited | Professional & scientific | 1999 |
| Kings Arms Alehouse Ltd | Hospitality | 2020 |
| Kingston View Properties Limited | Construction | 2017 |
| Kirkthevet Ltd | Financial services | 2021 |
| Kristyna Sellnerova Ltd | Information & communication | 2019 |
| Landshire Country Foods Limited | Extraterritorial | 1996 |
| Larkbeare Holdings Limited | Agriculture & fishing | 1965 |
| Larrangton-White Limited | Other services | 2017 |
| Laura Barber Ltd | Professional & scientific | 2019 |
| LDD Electronic Consulting Ltd | Professional & scientific | 2021 |
| Legacy Ironworks Ltd | Manufacturing | 2025 |
| LH Associates Ltd | Professional & scientific | 2025 |
| Lime (CM) Limited | Construction | 2025 |
| Liquid EGG Co Limited | Extraterritorial | 2023 |
| LJ Saint Ltd | Information & communication | 2020 |
| Logix Couriers Ltd | Transport & logistics | 2011 |
| Logix Solutions UK Limited | Real estate | 2021 |
| Logsure Limited | Agriculture & fishing | 2025 |
| Love Dazzle.Com Limited | Wholesale & retail | 2009 |
| Lucky Nails Ltd | Other services | 2026 |
| Lucy Birkhead Photography Limited | Professional & scientific | 2014 |
| Luffingham Limited | Financial services | 2020 |
| LVP Public Relations Ltd | Information & communication | 1998 |
| M P & E Leigh-Firbank Limited | Agriculture & fishing | 2007 |
| M.B. Crocker Holdings Limited | Financial services | 2024 |
| M.B. Crocker Limited | Agriculture & fishing | 1985 |
| M.B. Crocker Property (Holdings) Limited | Financial services | 2024 |
| M.B. Crocker Property Limited | Real estate | 2024 |
| Mahallati Holding Groups Ltd | Real estate | 2023 |
| Mamma Italiauk Ltd | Wholesale & retail | 2024 |
| Marcus White Ltd | Real estate | 2002 |
| Maritimo (UK) Limited | Extraterritorial | 2007 |
| Market Place (Sturminster) Management Company Limited | Households | 2007 |
| Market Place DRY Cleaners Limited | Other services | 2022 |
| Marnhull Stone Limited | Mining & quarrying | 1990 |
| Marshall's 'Metal Fabrication Limited | Manufacturing | 2011 |
| Martin Richards Agricultural Engineers Limited | Manufacturing | 2003 |
| Masterfit Flooring Limited | Wholesale & retail | 1999 |
| Medhurst French Polishers Limited | Other services | 2025 |
| Melchester Meadows Management Co Limited | Households | 2002 |
| Mellor Design Ltd | Professional & scientific | 2006 |
| Metallic Properties Ltd | Real estate | 2024 |
| Mill Point Holdings Limited | Real estate | 2024 |
| MJC Plant Inspection Limited | Manufacturing | 2012 |
| Mooley MOO Holdings Ltd | Financial services | 2020 |
| Moonfleet Camping Ltd | Administrative & support | 2022 |
| Moonma Limited | Wholesale & retail | 2026 |
| Mopenconsulting Limited | Information & communication | 2017 |
| Morton New Limited | Real estate | 2013 |
| Mosslee Enterprises Limited | Manufacturing | 1986 |
| Motley Digital Limited | Information & communication | 2021 |
| Motorcycle Vision Limited | Wholesale & retail | 2007 |
| Mouzle Limited | Professional & scientific | 2009 |
| MSB Studio Ltd | Information & communication | 2026 |
| Mucho Moolah Limited | Professional & scientific | 2018 |
| N16 Building & Maintenance Ltd | Construction | 2015 |
| Namah Group Limited | Manufacturing | 2026 |
| Nazareth Lodge Limited | Health & social care | 2007 |
| Netley Payroll Solutions Ltd | Professional & scientific | 2026 |
| New House Farm Ventures Limited | Agriculture & fishing | 2026 |
| New Radiation (2008) LLP | | 2008 |
| New Street Marnhull Management Limited | Households | 2002 |
| Newmore Consulting Limited | Information & communication | 2017 |
| Newton Services Limited | Construction | 2016 |
| NFP (Wessex) Limited | Professional & scientific | 2013 |
| Nicholas Breese Building Limited | Construction | 2008 |
| North Dorset Changeovers Ltd | Administrative & support | 2021 |
| Northover Energy Ltd | Extraterritorial | 2017 |
| NPL Asset Management Limited | Real estate | 1996 |
| NXB Limited | Professional & scientific | 2005 |
| NÜ RUG Limited | Wholesale & retail | 2023 |
| O & U (Developments) Dorset Ltd | Financial services | 2006 |
| Oakleaf Marquees Limited | Administrative & support | 2010 |
| Obhdorset Limited | Real estate | 2024 |
| OH SO Inviting Limited | Extraterritorial | 2010 |
| Okeford Consultants Ltd | Construction | 2018 |
| Okeford View Limited | Agriculture & fishing | 2014 |
| Old Market Mews Limited | Households | 2000 |
| Old Vicarage Capital Ltd | Professional & scientific | 2025 |
| Old Village Hall Management Ltd | Households | 2010 |
| Olives ET AL Limited | Manufacturing | 1999 |
| Olly Williams Limited | Information & communication | 2010 |
| Onko Industries Ltd | Information & communication | 2025 |
| Opal Mortgage Solutions Limited | Professional & scientific | 2014 |
| Orchard Gardens Management Company Sturminster Newton Limited | Households | 2008 |
| Original Content Ltd | Information & communication | 2011 |
| P C Perrett & Sons Limited | Agriculture & fishing | 2009 |