| Jordans Cafe (Horton) Limited | Hospitality | 2018 |
| Jordans Farms Limited | Agriculture & fishing | 2011 |
| JPG Accounting Ltd | Professional & scientific | 2023 |
| JSC Financial Limited | Financial services | 2024 |
| K and P Cafe Limited | Hospitality | 2023 |
| Kath Roberts Ltd | Other services | 2016 |
| Kaymar (South West) Limited | | 1982 |
| Kennford Management Company Ltd | Households | 2021 |
| Kent Periscopes Limited | Manufacturing | 2005 |
| Kevin Routley Builders Limited | Construction | 2015 |
| Kierhan Ellis Coaching & Therapy Ltd | Health & social care | 2022 |
| Kinesia Ltd | Health & social care | 2018 |
| Kingdom Kleen Ltd | Administrative & support | 2022 |
| Knight Electrical Switchgear Ltd. | Manufacturing | 2010 |
| Lambit Ltd | Information & communication | 2010 |
| Langford Carpentry Limited | Construction | 2026 |
| Larcombe Consultants Ltd | Transport & logistics | 2016 |
| Lawn Services Limited | Administrative & support | 2018 |
| Learys SW Ltd | Manufacturing | 2012 |
| Lees Valeting Ltd | Wholesale & retail | 2025 |
| Lehr Limited | Construction | 2024 |
| Level UP (South West) Limited | Administrative & support | 2006 |
| Lightcurve Limited | Information & communication | 2006 |
| Lilywhite Mortgages Limited | Financial services | 2025 |
| Little Axes Limited | Information & communication | 2023 |
| Little Hobson Ltd | Hospitality | 2025 |
| Livellum Ltd | Manufacturing | 2015 |
| LO Interiors (Somerset) Limited | Professional & scientific | 2022 |
| Logistical Management Services International Limited | Transport & logistics | 1997 |
| Lost Soul Collective Ltd | Wholesale & retail | 2020 |
| Loulousmelts Ltd | Wholesale & retail | 2020 |
| Love and Rockets Events Ltd | Arts & recreation | 2023 |
| Lower Sea Farm Management Company Limited | Households | 2019 |
| Lowland Trading Ltd | Wholesale & retail | 2009 |
| Loxston Groundcare Limited | Manufacturing | 1994 |
| Loyal Retainers Ltd | Information & communication | 2012 |
| Lrhc Somerset LLP | | 2019 |
| LT Convenience Ltd | Wholesale & retail | 2024 |
| Lufton Limited | Extraterritorial | 2012 |
| Luke Mann Writing Services Ltd | Arts & recreation | 2023 |
| Lythium Ltd | Information & communication | 2020 |
| M & G Harding Developments Limited | Construction | 2006 |
| M & S Gould Limited | Construction | 2017 |
| M5 Motors Ltd | Wholesale & retail | 2025 |
| Macs Printing Limited | Administrative & support | 2020 |
| Magnum Vehicle Solutions Limited | Wholesale & retail | 2008 |
| Manders Financial Services Limited | Financial services | 2014 |
| Mark Landon Ltd | Professional & scientific | 2023 |
| Mark Lovell Limited | Wholesale & retail | 1990 |
| Marks Away SW Ltd | Construction | 2024 |
| Martin Telfer Limited | Professional & scientific | 2012 |
| Martyn England Construction Limited | Agriculture & fishing | 2001 |
| Matthew B Downing Water Drilling Services Ltd | Construction | 2024 |
| Matthew Horgan Limited | Construction | 2003 |
| Mawbuild Construction Ltd | Construction | 2022 |
| Mawbuild Ltd | Construction | 2019 |
| Mawfit Ltd | Arts & recreation | 2018 |
| Mawfit Yeovil Ltd | Arts & recreation | 2019 |
| Mawproperty Ltd | Real estate | 2022 |
| Mayfair Recoatings Ltd | Construction | 2018 |
| Mayfair Refurbishments Limited | Construction | 2010 |
| Mearswood Limited | Other services | 2016 |
| MEC (Ilminster) Ltd | Construction | 2015 |
| Medland Motorsport Media Ltd | Information & communication | 2015 |
| Mela Construction Limited | Construction | 2013 |
| Mianda Terrace Management Company Limited | Households | 2002 |
| Milamber Ltd | Information & communication | 2022 |
| Millwood (South West) Limited | Construction | 2018 |
| Minster Architectural Technologists Ltd | Professional & scientific | 2026 |
| Minster Tippers South West Ltd | Construction | 2019 |
| Minsterstone Limited | Manufacturing | 1995 |
| Miriam's Brewed With Love Ltd | Hospitality | 2025 |
| Mitchams Accountants Limited | Professional & scientific | 2010 |
| Monkeypuzzle Computers Limited | Information & communication | 2002 |
| Monks Yard Limited | Hospitality | 2010 |
| Montpellier Enterprises Limited | Arts & recreation | 2012 |
| Morgan Sweet Limited | Construction | 2003 |
| Morph Digital Limited | Information & communication | 2012 |
| Morphsites Ltd | Information & communication | 2010 |
| Mpfl SX Ltd | Real estate | 2026 |
| MS Gyms Ltd | Arts & recreation | 2015 |
| MSR Plant Hire Ltd | Construction | 2021 |
| Muddy Paws Fields Ltd. | Other services | 2018 |
| N C Welding & Electrical Services Limited | Manufacturing | 2010 |
| NAC Limited | Real estate | 2001 |
| National Fencing Contractors Ltd | Construction | 2018 |
| Natti Fuel Ltd | Wholesale & retail | 2026 |
| Neuroconnect CIC | Health & social care | 2023 |
| Non-Such Productions Ltd | Information & communication | 2018 |
| Npalk Ltd | Professional & scientific | 2025 |
| Nutrition 2030 Limited | Professional & scientific | 2020 |
| O G Protection Ltd | Administrative & support | 2024 |
| Oak Barn Photography Ltd. | Professional & scientific | 2014 |
| Oakwater Holidays Limited | Hospitality | 2025 |
| Oakwood Accounting Ltd | Professional & scientific | 2020 |
| Octopi Promotions Limited | Other services | 2013 |
| Old Farm Court (Management) Limited | Real estate | 1996 |
| Oliver Donaldson Consultant Ltd | Health & social care | 2016 |
| Olivers Orchard Management Company Limited | Households | 2000 |
| Only Footprints Limited | Extraterritorial | 2009 |