| LSC Education Consultancy Limited | Administrative & support | 2016 |
| LSN Investments Ltd | Financial services | 2025 |
| Lsztrading Limited | Transport & logistics | 2023 |
| Lualua Limited | Manufacturing | 2010 |
| Luca Events Limited | Hospitality | 2020 |
| Lucerne Villa (Shanklin) Management Company Limited | Households | 1986 |
| Lucian Car Wash Limited | Other services | 2021 |
| Luckie Sibindi Ltd. | Health & social care | 2018 |
| Lucky Designs Ltd | Professional & scientific | 2019 |
| Lucky NO 7 Coffee Limited | Manufacturing | 2025 |
| Lucky NO. 7 Limited | Professional & scientific | 2022 |
| Luckytrucker UK Competitions Ltd | Transport & logistics | 2024 |
| Ludlow Property Group Ltd | Real estate | 2020 |
| Lufash Logistics Ltd | Transport & logistics | 2025 |
| Luis Homes Limited | Real estate | 2024 |
| Luisiana Firu Ltd | Health & social care | 2019 |
| Luke Bailey Media Ltd | Professional & scientific | 2019 |
| Luke Rowe Cycling Limited | Arts & recreation | 2012 |
| Luke Thorpe Ltd | Manufacturing | 2025 |
| Luma Renovations Ltd | Real estate | 2026 |
| Lumarla Ltd | Wholesale & retail | 2026 |
| Lumax Precision Engineering Limited | Professional & scientific | 2021 |
| Lumber Construction (South Wales) Ltd | Construction | 2022 |
| Lumen PM Ltd | Professional & scientific | 2025 |
| Lumeo Lighting Ltd | Construction | 2025 |
| Lumicad Ltd | Professional & scientific | 2021 |
| Lumin Solutions Ltd | Wholesale & retail | 2024 |
| Luminia Support Ltd | Public administration | 2025 |
| LUMUS360 Ltd. | Professional & scientific | 1998 |
| Lunaris Games Ltd | Information & communication | 2019 |
| Luné Cosmetics Ltd | Wholesale & retail | 2026 |
| Lupeek Services Ltd | Professional & scientific | 2025 |
| Lush EP Aesthetics Ltd | Other services | 2020 |
| Lushington Garden Buildings (IOW) Limited | Construction | 2013 |
| Lushington Garden Buildings Limited | Construction | 2002 |
| Lusso Systems Limited | Manufacturing | 2019 |
| Luxe Hair Lounge Academy Ltd | Other services | 2022 |
| Luxe Key Properties Ltd | Real estate | 2024 |
| Luxstar Limited | Transport & logistics | 2020 |
| Luxury Pet Care Ltd | Wholesale & retail | 2019 |
| LW & Co Engineering Technology Solutions Limited | Wholesale & retail | 2024 |
| LW Techsolutions Ltd | Manufacturing | 2025 |
| LW15 Properties Ltd | Real estate | 2018 |
| Lwsdesigns Ltd | Wholesale & retail | 2025 |
| Lyceum Property Partners LLP | | 2024 |
| LYDS6 Properties Limited | Real estate | 2015 |
| Lyncroft Management Limited | Households | 1989 |
| Lyndhurst Services UK Limited | Hospitality | 2002 |
| Lyngar Scaffolding Limited | Construction | 2011 |
| Lynn PIT Landfill LLP | | 2011 |
| Lynn Resources Limited | Wholesale & retail | 2025 |
| Lynrise Limited | Administrative & support | 1994 |
| Lynwood Investments Limited | Real estate | 2006 |
| Lyons Gate Investments Limited | Real estate | 2018 |
| M & a Properties NPT Ltd | Real estate | 2023 |
| M & a Services Bristol Ltd | Transport & logistics | 2020 |
| M & D Sewing Machines Limited | Professional & scientific | 2008 |
| M & E Contractors Limited | Construction | 2018 |
| M & F Williams Limited | Real estate | 2015 |
| M & L Williams Limited | Construction | 2012 |
| M & M Automotive (Newport) Ltd | Wholesale & retail | 2017 |
| M & M Bricklaying Limited | Construction | 2018 |
| M & P Property (South Wales) Limited | Real estate | 2015 |
| M & P Services 2020 Limited | Transport & logistics | 2020 |
| M & R Williams Farm Services Limited | Administrative & support | 1995 |
| M & T Orthotics Ltd | Health & social care | 2005 |
| M 4 Motoring Driving School Limited | Transport & logistics | 2014 |
| M a Gwillim Limited | Professional & scientific | 2010 |
| M a Rees Property Ltd | Real estate | 2026 |
| M Architecture & Interiors Limited | Professional & scientific | 2020 |
| M B Composites Limited | Professional & scientific | 2010 |
| M B Kennerley Associates Ltd | Professional & scientific | 2021 |
| M Bradly Investments Limited | Real estate | 2006 |
| M Bull Aerospace Ltd | Professional & scientific | 2014 |
| M Collingwood Limited | Construction | 2025 |
| M E P Freight Services Limited | Construction | 1994 |
| M Ferreira Ltd | Health & social care | 2013 |
| M Group Holdings Limited | Professional & scientific | 2002 |
| M H Davies Construction Limited | Construction | 2025 |
| M H Davies Properties Limited | Construction | 2025 |
| M H Davies Transport Limited | Transport & logistics | 2025 |
| M J Agri Tuning Ltd | Professional & scientific | 2023 |
| M J Austin Ltd | Agriculture & fishing | 2015 |
| M J B Networking Limited | Information & communication | 2013 |
| M J Gallagher Limited | Agriculture & fishing | 2025 |
| M J Wallace Limited | Construction | 2016 |
| M Jones Maintenance Services Ltd | Manufacturing | 2026 |
| M M Roofing Services Limited | Construction | 2023 |
| M Maull Groundworks Ltd | Construction | 2018 |
| M Mining & Strategies Ltd | Professional & scientific | 2026 |
| M N Business Services Ltd | Professional & scientific | 2011 |
| M Nazir Empire Ltd | Wholesale & retail | 2025 |
| M P Contractors Limited | Construction | 2003 |
| M POP Trans Ltd | Transport & logistics | 2024 |
| M R Debenham Limited | Water & waste | 2008 |
| M Ralph Plumbing Ltd | Construction | 2024 |
| M&G Sheppard Properties Limited | Real estate | 2017 |
| M&J Holdings (IOW) Ltd | Financial services | 2026 |
| M&K Brothers Ltd | Wholesale & retail | 2020 |
| M&L Investments Limited | Administrative & support | 2016 |