| Langley Court (Beckenham) Management Company Limited | Households | 2019 |
| Langley Waterside Residents Association Limited | Households | 2012 |
| Langly-Smith Lecturing and Learning Limited | Other services | 2018 |
| Lantern Blinds Ltd | Wholesale & retail | 2025 |
| Lantern View Property Management Limited | Households | 2003 |
| Lapstone Engineering Limited | Manufacturing | 1995 |
| Lapstone Holdings Limited | Financial services | 2024 |
| Lara Sharp Limited | Professional & scientific | 2017 |
| Larant Transport Limited | Transport & logistics | 2014 |
| Larkbear Management Company Limited | Households | 2020 |
| Larkfell Limited | Wholesale & retail | 1975 |
| Larkham Design Ltd | Professional & scientific | 2013 |
| Larkhill Eventing Limited | Arts & recreation | 2025 |
| Larkwood Estates Limited | Real estate | 2025 |
| Larkwood Kitchens Limited | Wholesale & retail | 2023 |
| Larmer Tree Limited | Arts & recreation | 2014 |
| Larsena Limited | Administrative & support | 2017 |
| Lascar Electronics Limited | Manufacturing | 2005 |
| Lascar Limited | Extraterritorial | 2005 |
| Laser Assure Ltd | Professional & scientific | 2022 |
| Lashbrook Media Ltd | Professional & scientific | 2011 |
| Latchmere Lodge (Durrington) Limited | Households | 1987 |
| Latchmore Healthcare Associates LLP | | 2019 |
| Latton Place Management Limited | Households | 2017 |
| Launchcode Limited | Professional & scientific | 1995 |
| Laura Jade Home Care Services Ltd | Health & social care | 2026 |
| Laurem Ipsum Limited | Arts & recreation | 2025 |
| Lautoka Vintage Ltd | Wholesale & retail | 2020 |
| Lavender Copse Management Company Limited | Households | 2008 |
| Lawati Property Ltd | Real estate | 2024 |
| Lawford Lane Residents Limited | Households | 1990 |
| Lawntech Limited | Other services | 2010 |
| Lawrence Marshall Web Ltd | Information & communication | 2023 |
| Laww Developments Ltd | Construction | 2023 |
| Laww Lettings Limited | Real estate | 2025 |
| Laxton Grange Management Limited | Households | 2007 |
| Lazerpoint Ltd | Wholesale & retail | 2002 |
| Laztec (European) Limited | Information & communication | 2025 |
| LB Consulting (UK) Limited | Professional & scientific | 2013 |
| LBB Business Solutions Limited | Professional & scientific | 2014 |
| LC Engineering (South West) Ltd | Wholesale & retail | 2023 |
| LCD Building Services Limited | Construction | 2025 |
| LCS Training and Mentoring Ltd | Education | 2025 |
| LD Travel LUX Ltd | Transport & logistics | 2026 |
| LDJ HR & Employee Relations Ltd | Professional & scientific | 2026 |
| LDS Advisors Ltd | Administrative & support | 2021 |
| LE Sablier Limited | Professional & scientific | 2008 |
| LEA Consulting Ltd | Professional & scientific | 2022 |
| Leacroft (West Heath) Management Company Limited | Households | 2007 |
| Leadership Development Holdings Limited | Professional & scientific | 1989 |
| Leadership Development Limited | Education | 1979 |
| Leadership Essentials Limited | Professional & scientific | 2024 |
| Leadfoot Racing Limited | Wholesale & retail | 2016 |
| Learning 2XL Limited | Administrative & support | 2017 |
| Learning 3D Limited | Education | 2019 |
| Learning in Media Limited | Education | 2015 |
| Leasepro Solutions Limited | Administrative & support | 2025 |
| Lechlade on Thames Heritage and Development Trust | Other services | 2003 |
| Leckford Group Limited | Professional & scientific | 2011 |
| LEE Oades Consulting Limited | Information & communication | 2008 |
| LEE Technology Limited | Information & communication | 2009 |
| Leeds Landscapes Ltd | Administrative & support | 2003 |
| Leeson Properties (Winchester) Ltd | Real estate | 2020 |
| Legend Barbershop 1 Ltd | Other services | 2026 |
| Legero International (UK) Limited | Professional & scientific | 2023 |
| Leilac Limited | Mining & quarrying | 2009 |
| Lemon PIX Limited | Wholesale & retail | 2010 |
| Lemon Twist Tapas Bar Ltd | Hospitality | 2018 |
| Lennyvent Limited | Manufacturing | 2018 |
| Leobo Pet Day Care Solutions Ltd | Other services | 2015 |
| Leon Maculewicz Creative Ltd | Construction | 2023 |
| Leopard Capital 1 Limited | Real estate | 2016 |
| Leopard Capital 2 Limited | Real estate | 2017 |
| Leopard Capital 3 Limited | Real estate | 2017 |
| Leopard Capital 4 Limited | Real estate | 2021 |
| Leopard Capital 5 Limited | Real estate | 2021 |
| Leopard Capital Holdings Limited | Real estate | 2026 |
| Leopard Capital Project Management Ltd | Real estate | 2026 |
| Leopard Capital UK Limited | Real estate | 2016 |
| LES Wilson Limited | Professional & scientific | 2002 |
| Lesley a Thomas Limited | Professional & scientific | 2020 |
| Letsah Limited | Professional & scientific | 2013 |
| Letterbell Limited | Professional & scientific | 2005 |
| Lettings-R-Us (Holdings) Limited | Extraterritorial | 2009 |
| Lettings-R-Us Franchising Limited | Extraterritorial | 2014 |
| Lettings-R-Us Limited | Real estate | 2004 |
| Lettings-R-Us Properties Limited | Real estate | 2009 |
| Level Trade Limited | Other services | 2022 |
| Level UP Salisbury CIC | Other services | 2024 |
| Lewis Chapman Productions Ltd | Information & communication | 2026 |
| Lewis Entertainments Limited | Information & communication | 2000 |
| Lewis Property Services Ltd | Administrative & support | 2002 |
| Lewis-Jones Ltd | Professional & scientific | 2019 |
| LEX Nautica Ltd | Professional & scientific | 2024 |
| Lexfox Retail Limited | Wholesale & retail | 2023 |
| Lexi Short Ltd | Professional & scientific | 2021 |
| Lexis Information Systems Limited | Professional & scientific | 2005 |
| LEY Lines Music & Arts Ltd | Administrative & support | 2026 |
| LF Industry Ltd | Manufacturing | 2020 |
| LH & EB Holdings Limited | Real estate | 2023 |