| L and C Group Limited | Wholesale & retail | 2022 |
| L E Butler Ltd | Financial services | 2023 |
| L H Ventures Ltd | Wholesale & retail | 2024 |
| L L Consultancy & Design Limited | Professional & scientific | 2024 |
| L S L Architecture Ltd | Professional & scientific | 2018 |
| L S Plumbing, Heating & GAS Engineer Ltd | Other services | 2005 |
| L&D Garage Two Ltd | Wholesale & retail | 2023 |
| L&J H Asset Management Ltd | Financial services | 2025 |
| L&M Logistics Limited | Transport & logistics | 2024 |
| L'Autre Croix Limited | Hospitality | 2022 |
| L. O. Clothier & Sons Limited | Agriculture & fishing | 1959 |
| L.E.W. Techniques Limited | Manufacturing | 1966 |
| L.G. Electrical Limited | Construction | 2004 |
| L.M.Agriculture Limited | Professional & scientific | 1932 |
| LA Belle Boudoir Ltd | Wholesale & retail | 2017 |
| LA Danutz SRL Ltd | Health & social care | 2017 |
| LAB Mechanical Services Limited | Construction | 2026 |
| Label Webshop Limited | Wholesale & retail | 2014 |
| Labour Campaign for Human Rights Ltd. | Other services | 2013 |
| Ladymead Properties LLP | | 2018 |
| Laet Ltd | Wholesale & retail | 2019 |
| Laird Property Ltd | Households | 2023 |
| Lake Consultancy and Investments Limited | Information & communication | 1983 |
| Lakeside House Dental Practice Limited | Health & social care | 2022 |
| Lakeside Living Developments Limited | Construction | 2026 |
| Lakeview-Keinton (Management Company) Ltd | Households | 2019 |
| Lakshmi Therapy Ltd | Health & social care | 2021 |
| Lalapanzi Ltd | Real estate | 2018 |
| Lamb & Flag Blagdon Hill Ltd | Hospitality | 2019 |
| Lambpark Court Management (1993) Company Limited | Other services | 1993 |
| Lambs Co. Films Ltd | Information & communication | 2025 |
| Lamina Imprints Limited | Manufacturing | 2022 |
| Lamplighters Management Limited | Real estate | 2008 |
| LAN Health Care Ltd | Administrative & support | 2024 |
| LAN Home Care Ltd | Administrative & support | 2024 |
| Lance Levy Investments 2013 Limited | Financial services | 2013 |
| Lance Levy Investments Limited | Real estate | 2006 |
| Landford Enterprises Ltd | Financial services | 2022 |
| Landlord GAS Checks Ltd | Construction | 2017 |
| Landlordcentral Ltd | Real estate | 2020 |
| Landmark Pavers Limited | Administrative & support | 2011 |
| Landmark Southern Limited | Construction | 2004 |
| Landmore Developments Limited | Construction | 2016 |
| Landscape Southwest Ltd | Administrative & support | 2022 |
| Lane Lettings Ltd | Real estate | 2026 |
| Lang Solutions Ltd | Professional & scientific | 2026 |
| Lansparent Holdings Limited | Information & communication | 2023 |
| Lantex UK Ltd | Professional & scientific | 2009 |
| Lantons Ltd | Agriculture & fishing | 2018 |
| Larch Wood Timber Buildings Ltd | Construction | 2021 |
| Larfsen Bows Ltd. | Information & communication | 1998 |
| Larkhill Road Yeovil Management Company Limited | Households | 2007 |
| Larkman Edgcumbe Limited | Professional & scientific | 1989 |
| Larkwood Limited | Professional & scientific | 2006 |
| Larmak Holdings Ltd | Financial services | 2024 |
| Last Estate Agents Ltd | Real estate | 2021 |
| Lasting Classics Limited | Wholesale & retail | 2015 |
| Later the Same Day Ltd | Arts & recreation | 2017 |
| Laterem S/W Ltd | Construction | 2024 |
| Latham Enterprise Ltd | Wholesale & retail | 2021 |
| Latsite Limited | Wholesale & retail | 1976 |
| Lattanzio I.T. Services Limited | Information & communication | 2009 |
| Lattice Projects Limited | Construction | 2006 |
| Laughing Gull Teas Ltd | Hospitality | 2026 |
| Launceston Farm Limited | Agriculture & fishing | 2009 |
| Launchpad Brand Consultancy Ltd | Professional & scientific | 2023 |
| Laura Bardell Ltd | Information & communication | 2016 |
| Laura Hill Investments Limited | Financial services | 2017 |
| Laura Waring Ltd | Financial services | 2023 |
| Laurel Hill (Cribbs Causeway) 15 Apartments Management Company Limited | Households | 2022 |
| Laurel Hill (Cribbs Causeway) 6 Apartments Management Company Limited | Households | 2021 |
| Laurel Hill (Cribbs Causeway) Management Company Limited | Households | 2021 |
| Laurel Hine Centre Ltd | Health & social care | 2020 |
| Laurel Homecare Limited | Health & social care | 2019 |
| Laurence Mitchell Ltd | Professional & scientific | 2015 |
| Laurene Doula & Haptonomy Ltd | Other services | 2023 |
| Lavender Hill Holidays Limited | Agriculture & fishing | 2010 |
| Laytons Wings Ltd | Manufacturing | 2024 |
| Lazfields Ltd | Professional & scientific | 2018 |
| Lcgolf Ltd | Arts & recreation | 2025 |
| LCT Plant Hire Ltd | Administrative & support | 2026 |
| LE Property Group Ltd | Construction | 2026 |
| Lead Kind Ltd. | Administrative & support | 2024 |
| Leadbooks Ltd | Professional & scientific | 2025 |
| Leadership for Today (L4T) Ltd | Administrative & support | 2002 |
| Leatside Storage & Distribution Limited | Transport & logistics | 2019 |
| Leaze Farm Ltd | Agriculture & fishing | 2013 |
| LED Architects LLP | | 2024 |
| Ledgability Limited | Professional & scientific | 2003 |
| LEE Evans Limited | Construction | 2006 |
| LEE Kukor Morgan Limited | Information & communication | 2007 |
| Leegan Property Ltd | Construction | 2026 |
| Leeman Enterprises Limited | Professional & scientific | 2018 |
| Lees Equine Ltd | Professional & scientific | 2022 |
| Left Field Agriculture Ltd | Agriculture & fishing | 2025 |
| Legal Actions Support Services Ltd | Professional & scientific | 2018 |
| Legends Barber Shop Ltd | Other services | 2011 |
| Legion Road Limited | Households | 1991 |
| Leigh Hair & Beauty Limited | Other services | 2025 |
| Lema Group Limited | Financial services | 2025 |