| LSG Scientific Consulting Ltd | Professional & scientific | 2017 |
| LSG Solutions Ltd | Administrative & support | 2013 |
| Lsvm Fuels Limited | Wholesale & retail | 2021 |
| LT Racking Limited | Manufacturing | 2012 |
| Ltabp Limited | Other services | 2019 |
| LTW Holdings Limited | Financial services | 2022 |
| Luadmi Transport Ltd | Transport & logistics | 2024 |
| Lubaroc Limited | Construction | 2016 |
| Lucas Chemicals Limited | Manufacturing | 1977 |
| Luccaindiamal Holdings Ltd | Real estate | 2024 |
| Lucky Delicious Limited | Hospitality | 2026 |
| Lucky OU Limited | Wholesale & retail | 2025 |
| Lucy & YAK EOT Limited | Financial services | 2025 |
| Lucy and YAK Ltd | Wholesale & retail | 2017 |
| Lucy Denizkiran Ltd | Professional & scientific | 2026 |
| LUI Smith Delivery Ltd | Transport & logistics | 2026 |
| Luks Green Ltd | Construction | 2023 |
| Lumen & OLF Candle Company Limited | Manufacturing | 2020 |
| Lumi Restaurant & Gardens Ltd | Hospitality | 2025 |
| Luminara Insight Ltd | Professional & scientific | 2021 |
| Luna Aquatics Limited | Wholesale & retail | 2025 |
| Luna Delivery Ltd | Transport & logistics | 2024 |
| Lunah Support Limited | Administrative & support | 2022 |
| Lunches and Themes Ltd | Hospitality | 2023 |
| Lundhill Agriculture Limited | Professional & scientific | 2016 |
| Lundowood Mini Market Ltd | Wholesale & retail | 2025 |
| Lundwood Local Ltd | Wholesale & retail | 2024 |
| Lungarno Living Limited | Real estate | 2005 |
| Lupa Tools Ltd | Other services | 2018 |
| Lurcher Industries Ltd | Wholesale & retail | 2025 |
| Luto Research Limited | Professional & scientific | 2004 |
| LUX AFP Limited | Transport & logistics | 2025 |
| LUX Bright Solutions Ltd | Wholesale & retail | 2013 |
| LUX Core Creative Ltd | Professional & scientific | 2025 |
| LUX Elice Limited | Other services | 2024 |
| LUX Empire Ltd | Wholesale & retail | 2019 |
| Luxe Bridal Ltd | Wholesale & retail | 2021 |
| Luxe Glow Ltd | Other services | 2026 |
| Luxe Living Interiors Ltd | Wholesale & retail | 2022 |
| Luxe Skin Ltd | Other services | 2022 |
| Luxe World Limited | Wholesale & retail | 2025 |
| Luxury Door Solutions Ltd | Construction | 2019 |
| LUZ Advanced Clinical Practice Ltd | Administrative & support | 2023 |
| LV8 Ltd | Professional & scientific | 2023 |
| LW Accounting and Business Services Ltd | Professional & scientific | 2021 |
| LW GAS and Renewables Ltd | Construction | 2024 |
| LW Strategies Ltd | Real estate | 2025 |
| Lygocare Ltd | Health & social care | 2018 |
| LYN Bassett Digital Ltd | Professional & scientific | 2020 |
| Lynwood Care Services Limited | Health & social care | 2015 |
| Lyon Automotive Limited | Wholesale & retail | 2023 |
| Lyra AI Ltd | Information & communication | 2026 |
| L’Shawe Beds Carpets & Floors Limited | Wholesale & retail | 2024 |
| M & a Civils Ltd | Construction | 2025 |
| M & C Imports Limited | Wholesale & retail | 2016 |
| M & C Road Holdings Limited | Construction | 2022 |
| M & D Projects UK Limited | Manufacturing | 2005 |
| M & J Building and Joinery Services Limited | Construction | 2004 |
| M & K Locum Services Ltd | Health & social care | 2021 |
| M & S Parton Limited | Wholesale & retail | 2013 |
| M & S Powder Coating Ltd | Manufacturing | 2010 |
| M & T Farnsworth Limited | Wholesale & retail | 2015 |
| M & W Property Solutions Limited | Real estate | 2024 |
| M and S Property Solutions Limited | Construction | 2024 |
| M and S Pubs Ltd | Hospitality | 2025 |
| M Brookes Plumbing and Heating Ltd | Construction | 2020 |
| M D Cars Ltd | Wholesale & retail | 2004 |
| M Ekin Electrical Services Limited | Construction | 2012 |
| M G Commercial Management (North East) Limited | Construction | 2003 |
| M G Floors Limited | Administrative & support | 2014 |
| M Gaughan Transport Limited | Transport & logistics | 2022 |
| M Group Property Estates Ltd | Real estate | 2018 |
| M Group Solutions Ltd | Information & communication | 2023 |
| M H Enterprises Limited | Transport & logistics | 2015 |
| M H Kitchens & Joinery Limited | Construction | 2025 |
| M Hudson Roofing Ltd | Construction | 2019 |
| M M a Transport Limited | Transport & logistics | 2012 |
| M Malley Joinery Ltd | Construction | 2024 |
| M Masaniello Ltd | Construction | 2015 |
| M PUB Ltd | Hospitality | 2018 |
| M R W Autos Ltd | Transport & logistics | 2010 |
| M S CAD Solutions Limited | Professional & scientific | 2007 |
| M&C Property Holding Company Limited | Real estate | 2024 |
| M&E Medical Ltd | Health & social care | 2025 |
| M&E Property Services Ltd | Real estate | 2026 |
| M&Kez Laundry Services Limited | Other services | 2026 |
| M&M Building & Garden Supplies Ltd | Extraterritorial | 2024 |
| M&N Trans Ltd | Transport & logistics | 2026 |
| M&R Electric Limited | Professional & scientific | 2017 |
| M&S Luxury Lets Limited | Real estate | 2025 |
| M. a. Wilson Building & Paving Ltd | Construction | 2012 |
| M. Shimwell Ltd | Construction | 2026 |
| M.A.C. Moorhouse Air Conditioning Ltd | Manufacturing | 1997 |
| M.A.D DUO Ltd | Real estate | 2020 |
| M.A.M Facilities Limited | Real estate | 2018 |
| M.A.M Roofing (Services) Limited | Construction | 2012 |
| M.B. Products Limited | Manufacturing | 1991 |
| M.C Young Engineering Ltd | Energy | 2019 |
| M.C. Engineering (UK) Limited | Manufacturing | 2009 |
| M.E.M. SRB Logistics Ltd | Transport & logistics | 2025 |