| Long Barn Catering Limited | Hospitality | 1999 |
| Longriver Holdings Limited | Financial services | 1998 |
| Longriver Trading Limited | Wholesale & retail | 1998 |
| Longview Plumbing Ltd | Water & waste | 2025 |
| Lord’S Services Ltd | Construction | 2023 |
| Lost & Found Courier Services Ltd | Transport & logistics | 2019 |
| Lost & Found International Couriers Ltd | Transport & logistics | 2026 |
| Lotties Yard Limited | Hospitality | 2018 |
| Lotus Global Maritime Ltd | Transport & logistics | 2022 |
| Loudwater 888 Ltd | Wholesale & retail | 2025 |
| Louis Brands Ltd | Wholesale & retail | 2026 |
| Louisa J Shepherd Limited | Hospitality | 2012 |
| Louise Guita Limited | Administrative & support | 2015 |
| Love Notes Limited | Manufacturing | 2022 |
| Love That Lawn Limited | Professional & scientific | 2018 |
| Lowbrook Academy Trust | Education | 2011 |
| Lowbrook Contract Services Limited | Professional & scientific | 2021 |
| Lowbrook Trading Company Limited | Education | 2011 |
| Lowri 2017 Limited | Information & communication | 2021 |
| Loxo Solutions Ltd | Professional & scientific | 2018 |
| Loyalty Cover Limited | Financial services | 2019 |
| Loyalty Cover Software Limited | Information & communication | 2023 |
| LPB Property Maintenance Ltd | Administrative & support | 2025 |
| Lsrb Services Ltd | Administrative & support | 2023 |
| LSV Consultancy Limited | Professional & scientific | 2015 |
| LTS Events Limited | Professional & scientific | 2022 |
| Luanna Productions Limited | Arts & recreation | 2019 |
| Lucentsys Ltd | Information & communication | 2012 |
| Lucidus Consulting Limited | Professional & scientific | 2000 |
| Lucky Bay Properties Ltd | Real estate | 2026 |
| Lucky Box Limited | Wholesale & retail | 2014 |
| Lucy Apples Ltd | Arts & recreation | 2025 |
| Lucy Loves Science Ltd | Professional & scientific | 2018 |
| Luda Bingo Limited | Extraterritorial | 2015 |
| Ludorum Limited | Professional & scientific | 2024 |
| Luis' PUB Company Ltd | Hospitality | 2014 |
| Lukas Auto Ltd | Wholesale & retail | 2026 |
| Lukas Blues Spedition Ltd | Transport & logistics | 2014 |
| Luke Dabbs Post Production Ltd | Information & communication | 2025 |
| Luke Harris Ltd | Manufacturing | 2024 |
| Lumi Control Limited | Information & communication | 2022 |
| Lumi Lettings Limited | Real estate | 2023 |
| Lumira Nexus Ltd | Information & communication | 2026 |
| Lummus Consultants International Limited | Professional & scientific | 2000 |
| Lunar Design Limited | Professional & scientific | 2004 |
| Lundy Investors Limited | Financial services | 2016 |
| Lustrawin Ltd | Wholesale & retail | 2024 |
| Luxury Sales Group Limited | Wholesale & retail | 2022 |
| Luxya Limited | Real estate | 2020 |
| LWS Collection Services Limited | Extraterritorial | 1994 |
| LX3 Property Ltd | Real estate | 2015 |
| Lysander Mead Management Company Limited | Real estate | 1992 |
| LYT Cubed Ltd | Professional & scientific | 2023 |
| M & D Family Ltd | Hospitality | 2014 |
| M & T Engineering Limited | Wholesale & retail | 2005 |
| M C I Media Ltd | Information & communication | 1996 |
| M Cargo Solutions Ltd | Transport & logistics | 2023 |
| M E Last Films Limited | Manufacturing | 2025 |
| M E SUB Limited | Professional & scientific | 1992 |
| M Holmes Properties Ltd | Real estate | 2017 |
| M T Baker Limited | Construction | 2005 |
| M T Construction Ltd | Construction | 2016 |
| M T Perry Engineering Limited | Manufacturing | 1994 |
| M Whyte Design Limited | Professional & scientific | 2019 |
| M&D Mini Market Ltd. | Wholesale & retail | 2025 |
| M&H Berkshire Ltd | Real estate | 2023 |
| M&M Driving Services Limited | Transport & logistics | 2024 |
| M&Ma Ltd | Other services | 2026 |
| M&N Simple Properties Ltd | Real estate | 2026 |
| M&R Accounting Ltd | Professional & scientific | 2015 |
| M&R Consulting Holdings Limited | Financial services | 2023 |
| M&S Decor (South) Limited | Construction | 2012 |
| M&S Investments (London) Ltd | Real estate | 2025 |
| M-Riaz Limited | Health & social care | 2025 |
| M.C. Robins & Co. Limited | Construction | 1973 |
| M.O.T and Automotive Services Ltd | Professional & scientific | 2018 |
| M9DESIGN Limited | Professional & scientific | 2005 |
| MA Corporate Finance Ltd | Professional & scientific | 2025 |
| Maanifique Sculpt Studio Ltd | Other services | 2026 |
| Maarf Holdings Limited | Financial services | 2026 |
| Maarf Limited | Financial services | 2025 |
| Maars T Online Ltd | Information & communication | 2015 |
| Macaw Management Limited | Administrative & support | 1998 |
| Macbream Investments Limited | Real estate | 1960 |
| Macdonald Plumbing and Heating Services Limited | Construction | 2008 |
| Macgregor Industries Limited | Manufacturing | 1962 |
| Machinery Automation Ltd | Wholesale & retail | 2016 |
| Mack Transporter Ltd | Transport & logistics | 2019 |
| Mackinlay Explorer Limited | Arts & recreation | 2026 |
| Macneice Assets Limited | Financial services | 2025 |
| Macon Services Limited | Construction | 2014 |
| Macp Property Company Ltd | Real estate | 2012 |
| Macrotek Limited | Information & communication | 2007 |
| MAD Studios Ltd | Manufacturing | 2024 |
| MAD Truck Works Limited | Wholesale & retail | 2026 |
| Madam Samurai Properties Limited | Information & communication | 2009 |
| Maddox Ford Limited | Information & communication | 1987 |
| Madhavji Trading Ltd | Wholesale & retail | 2023 |
| Magictouchv Limited | Wholesale & retail | 2016 |
| Magnet Digital Limited | Information & communication | 2021 |