| J Goodland Electrical Ltd | Construction | 2024 |
| J L Burnell Construct & Maintain Ltd | Construction | 2026 |
| J Norris Electrical Limited | Construction | 2017 |
| JAC Family Company Limited | Extraterritorial | 2010 |
| Jack Bird Ltd | Extraterritorial | 2019 |
| Java Forge Ltd | Wholesale & retail | 2024 |
| JBS Building (SW) Ltd | Construction | 2025 |
| JDP Digital Limited | Information & communication | 2014 |
| Jealous Sweets Limited | Wholesale & retail | 2024 |
| JJS Occasions Limited | Wholesale & retail | 2013 |
| JM Weld Solutions Ltd | Manufacturing | 2017 |
| JMC Caravans Ltd | Manufacturing | 2024 |
| John Beveridge Limited | Professional & scientific | 2001 |
| John Wakley Ltd | Construction | 2018 |
| Jones & Monk Limited | Health & social care | 2018 |
| Joy Building Company Limited | Real estate | 2020 |
| JPW Installations Ltd | Construction | 2013 |
| Julian Rodda Plumbing and Heating Ltd | Construction | 2018 |
| Just Pick Cribbs Limited | Construction | 2010 |
| K J Billing Limited | Construction | 2003 |
| K&D Somerset Limited | Financial services | 2026 |
| King Developments Ltd | Construction | 2025 |
| Kings Electrical & Maintenance (SW) Ltd | Manufacturing | 2024 |
| Kings Oak Accountancy Services Limited | Professional & scientific | 2009 |
| Korzico Limited | Professional & scientific | 2025 |
| Kystone Limited | Construction | 2015 |
| L P Services (South West) Ltd | Construction | 2021 |
| L.H. Solar Limited | Energy | 2014 |
| Lakeside Carpentry Ltd | Construction | 2019 |
| Landscaping Works (SW) Ltd | Administrative & support | 2020 |
| Laura Terrace Limited | Households | 1980 |
| Lavender Country Kitchen Ltd | Hospitality | 2019 |
| Laver Cars Limited | Transport & logistics | 2014 |
| Leigh Road Management Company Limited | Households | 2013 |
| Leigh Road Restaurant Limited | Hospitality | 2021 |
| Levana Strategic Limited | Information & communication | 2026 |
| Little Burcott Limited | Agriculture & fishing | 2002 |
| LJK Site Services Ltd | Wholesale & retail | 2023 |
| Lowen Stephens Motorsport Ltd | Professional & scientific | 2026 |
| LP Developments Ltd | Real estate | 2025 |
| LS Musculoskeletal Clinic Limited | Other services | 2018 |
| Luigi Costanza Bros (Properties) Limited | Extraterritorial | 2001 |
| Luigi Costanza Bros Limited | Real estate | 1985 |
| M&D Business Limited | Health & social care | 2020 |
| M2 Smart Energy Ltd | Construction | 2026 |
| Maggs Travel Ltd | Other services | 2023 |
| Magnus Home Improvements Ltd | Construction | 2009 |
| Magnus Homes South West Ltd | Professional & scientific | 2013 |
| Maia Executive Taxi Ltd | Transport & logistics | 2017 |
| MAL Green Executive Chauffeur Services Ltd | Transport & logistics | 2014 |
| Manor Farm West Coker Management Limited | Real estate | 1988 |
| Mariden Ltd Ltd | Health & social care | 2026 |
| Mark Robbins Improvements Ltd | Construction | 2011 |
| Marshall's Landscaping (SW) Ltd | Administrative & support | 2024 |
| Mayfleet Limited | Real estate | 1994 |
| MCORINA28 Ltd | Health & social care | 2019 |
| Mendip Business Park Ltd | Households | 2020 |
| Mendip Mobility Limited | Wholesale & retail | 2007 |
| Mental Health in Combat Sports CIC | Education | 2024 |
| MI Wheel Limited | Arts & recreation | 2015 |
| Michael King's Limited | Manufacturing | 1994 |
| Miers Motor Co. Limited | Real estate | 1965 |
| Millfield Foundation | Administrative & support | 2007 |
| Millfield Nurseries Limited | Education | 2024 |
| Millfield Overseas Limited | Education | 2012 |
| MJB Cleaning and Consultancy Limited | Professional & scientific | 2009 |
| MJH Bespoke Joinery Ltd | Manufacturing | 2026 |
| MK9 Ltd | Education | 2024 |
| Modular Clean Air Limited | Extraterritorial | 2025 |
| Molden CUT (Street) Ltd | Other services | 2025 |
| Molyneux Property Services Limited | Real estate | 2016 |
| Moorview Plant Hire Limited | Transport & logistics | 2006 |
| Moulderz Electrical Services Ltd | Construction | 2022 |
| MPR Architectural Design Limited | Professional & scientific | 2016 |
| MR SEN Ltd | Real estate | 2022 |
| MTG99 Services Ltd | Information & communication | 2021 |
| Munitio Cyber Ltd | Information & communication | 2025 |
| Murphy Stevens Ltd | Professional & scientific | 2022 |
| My Fine Deli Ltd | Hospitality | 2021 |
| My Property Profile Ltd | Real estate | 2007 |
| Myamber Limited | Wholesale & retail | 2016 |
| N-Accounting Limited | Professional & scientific | 2026 |
| Natural Event Europe Limited | Administrative & support | 2008 |
| Needed Properties Ltd. | Real estate | 1997 |
| Ness's Cafe Limited | Hospitality | 2013 |
| New Beginnings Bar Ltd | Hospitality | 2022 |
| Newh Ltd | Transport & logistics | 2020 |
| Newhfarm Limited | Agriculture & fishing | 2025 |
| Nexora Intelligent Systems Limited | Information & communication | 2024 |
| Nexthop Global Limited | Information & communication | 2016 |
| NO 18 Limited | Wholesale & retail | 2023 |
| NO 2. Green Lane Management Company Limited | Real estate | 2008 |
| Nrweeks Welding Limited | Manufacturing | 2022 |
| Nuclearmarket Ltd | Information & communication | 2012 |
| O Frost Forestry & Arboriculture Limited | Agriculture & fishing | 2017 |
| O&B Motorsport Ltd | Professional & scientific | 2026 |
| Oakfield Contracts Ltd | Professional & scientific | 1997 |
| Oakfield Services (Street) Ltd | Construction | 2014 |
| Oasis Diamond and Gold Group Ltd | Manufacturing | 2020 |
| Oasis Gold Corporation Limited | Manufacturing | 2020 |