| Leisure Controls (Holdings) Limited | Manufacturing | 2014 |
| Leisure Controls International Limited | Manufacturing | 2004 |
| Lemon DOT HR Consultancy Limited | Administrative & support | 2011 |
| Leonardo Electronics Pension Scheme (Trustee) Ltd | Professional & scientific | 2005 |
| Leonardo Futureplanner (Trustee) Limited | Financial services | 2018 |
| Leonardo Helicopters Pension Scheme (Trustee) Limited | Manufacturing | 2011 |
| Leonardo Pension Schemes (Trustee) Ltd | Financial services | 2024 |
| Leptech Limited | Information & communication | 2005 |
| Lettermaze Limited | Construction | 2012 |
| Lewis and COX Limited | Financial services | 1984 |
| Lewis Downton Building Co Limited | Construction | 2025 |
| Lewis Quarries Ltd | Mining & quarrying | 2016 |
| Lewisells Ltd | Real estate | 2025 |
| LG Wealth Investments Ltd | Real estate | 2024 |
| Liberty Dairy Ltd | Manufacturing | 2018 |
| Liberty Loves UK Limited | Manufacturing | 2018 |
| Light Alder Ltd | Agriculture & fishing | 2021 |
| Lighter Leaves Ltd | Administrative & support | 2020 |
| Lighting Salvage Hunters Ltd | Wholesale & retail | 2020 |
| Lightning Training Solutions Limited | Administrative & support | 2010 |
| Lily AYO Ltd | Administrative & support | 2025 |
| Limitless Horizons SW Ltd | Health & social care | 2025 |
| Lincreal Precision Engineering Limited | Manufacturing | 1989 |
| Little Polar Records Limited | Arts & recreation | 2003 |
| Livingston Oak Ltd | Real estate | 2021 |
| Livingston Oak Property Holdings Limited | Real estate | 2023 |
| LIX Group Ltd | Hospitality | 2018 |
| LJ Property Partners Ltd | Real estate | 2023 |
| LJD Property Management Limited | Real estate | 2017 |
| Llfe Limited | Wholesale & retail | 2025 |
| Lmalton Supplies Ltd | Wholesale & retail | 2025 |
| LMP Medical Limited | Health & social care | 2015 |
| LN Nails Studio Ltd | Other services | 2024 |
| Lnyanzi Medical Services Limited | Health & social care | 2023 |
| Locado Internet Ltd | Professional & scientific | 2018 |
| Locado Marketing Ltd | Professional & scientific | 2018 |
| Locked Box Limited | Transport & logistics | 2021 |
| Lockett Tree Surgery Ltd | Agriculture & fishing | 2023 |
| Loders Butchers Limited | Wholesale & retail | 2017 |
| Logi Hawk Ltd | Wholesale & retail | 2022 |
| London Basket U.K. Ltd | Wholesale & retail | 2025 |
| Longman Cheese Sales Limited | Wholesale & retail | 1999 |
| Longman Property Developments Limited | Construction | 2016 |
| Longmead Veterinary Practice Limited | Professional & scientific | 2007 |
| Loose Heads Ltd | Wholesale & retail | 2024 |
| Lost Lady SOC. Ltd | Wholesale & retail | 2019 |
| Lottisham Church Farm Limited | Agriculture & fishing | 2020 |
| Lottisham Farms Holdings Limited | Agriculture & fishing | 2020 |
| Lottisham Farms Limited | Agriculture & fishing | 1960 |
| Love Sculpt Ltd | Other services | 2024 |
| Lower Bagber Farms Limited | Agriculture & fishing | 2005 |
| Lower Covey Limited | Education | 2002 |
| LP Training & Consultancy Limited | Administrative & support | 2026 |
| LPC Carpentry Ltd | Manufacturing | 2023 |
| LRW Assessments Limited | Health & social care | 2021 |
| LSA Electromagnetics Limited | Professional & scientific | 2014 |
| Lucys Estates Ltd | Real estate | 2017 |
| Luminos Health Ltd | Health & social care | 2026 |
| Luna Noir Limited | Wholesale & retail | 2025 |
| Lunar Sea Ltd | Administrative & support | 2016 |
| Lupton Wood and Partners Limited | Professional & scientific | 2005 |
| Lustrelake Investments Limited | Professional & scientific | 1963 |
| Luxe. Barbershop Ltd | Other services | 2024 |
| Luxury Accommodation Services Ltd | Real estate | 2023 |
| Luxury Lodgings Limited | Real estate | 2023 |
| LV Smart Phones Ltd | Wholesale & retail | 2024 |
| Lycka & Moose Ltd | Hospitality | 2024 |
| Lydden Group Ltd | Financial services | 2026 |
| Lyngray Developments Limited | Real estate | 1984 |
| Lynx Garage Limited | Wholesale & retail | 2019 |
| Lynx MOT Testing Centre Limited | Wholesale & retail | 2003 |
| Lyster Close Flat Management (2) Ltd. | Households | 2009 |
| M & J Bowers Limited | Water & waste | 2006 |
| M & J Crossman Limited | Agriculture & fishing | 2005 |
| M & L Supplies Ltd | Extraterritorial | 2023 |
| M & P Yeovil Ltd | Professional & scientific | 2024 |
| M & R Williams (Yeovil) Limited | Other services | 2000 |
| M & S White & SON Limited | Agriculture & fishing | 2015 |
| M G & a J Gingell Roofing Contractors Ltd. | Construction | 1997 |
| M Holden Mechanical Services Ltd. | Professional & scientific | 2013 |
| M J Electrical & Maintenance Ltd | Construction | 2022 |
| M J Gillan Limited | Wholesale & retail | 2006 |
| M J Sherring Limited | Other services | 2013 |
| M S Wealth Consultancy Ltd | Professional & scientific | 2018 |
| M.Icmeler Ltd | Health & social care | 2023 |
| Maak Properties and Management Ltd | Real estate | 2022 |
| Maco Limited | Wholesale & retail | 2022 |
| Made by Blake Limited | Manufacturing | 2018 |
| Magdalena&Tsenomir Ltd | Transport & logistics | 2022 |
| Magic Spice Ltd | Hospitality | 2015 |
| Magna Motors Limited | Extraterritorial | 1959 |
| Mainbeam Limited | Real estate | 2022 |
| Make IT! Education Limited | Education | 2019 |
| Maltons EST Ltd | Hospitality | 2023 |
| Manbuild Limited | Construction | 2016 |
| Mandarin Food House Limited | Hospitality | 2024 |
| Mandarin Yeovil Limited | Hospitality | 2026 |
| Manning & James Limited | Wholesale & retail | 2012 |
| Maperton Holdings Limited | Financial services | 2021 |
| Maple Garden Management Ltd | Administrative & support | 2005 |