| Lumi Boutique Ltd | Wholesale & retail | 2025 |
| Lumiaco Ltd | Wholesale & retail | 2025 |
| Luna Building Services Limited | Professional & scientific | 2016 |
| Luna QN Property Management Ltd | Real estate | 2024 |
| LUX Drive London Ltd | Administrative & support | 2016 |
| Luxe Grand Hotel Apartments Limited | Hospitality | 2025 |
| Luxenest Household Services Ltd | Administrative & support | 2026 |
| Luxesbuy Limited | Wholesale & retail | 2024 |
| Luxevue Investments Ltd | Wholesale & retail | 2025 |
| Luxmy Investment Ltd | Real estate | 2014 |
| Luxury Prestige Cars Ltd | Administrative & support | 2024 |
| Luxury Ride Chauffeur Services Ltd | Transport & logistics | 2022 |
| Luxury Tiles U.K Limited | Construction | 2016 |
| Luxury Trading Hub Limited | Wholesale & retail | 2025 |
| Luxury Transit Limited | Transport & logistics | 2023 |
| Lyallpur Galleria Ltd | Wholesale & retail | 2025 |
| Lyra Blue Ltd. | Construction | 2022 |
| Lyuven Ltd | Administrative & support | 2017 |
| LZ Couriers Ltd | Transport & logistics | 2016 |
| M & Faas Holdings Ltd | Financial services | 2025 |
| M & Faas Investment Group Ltd | Real estate | 2025 |
| M & Faas Ltd | Construction | 2020 |
| M & M Underwriting Limited | Financial services | 2008 |
| M & R Securities Limited | Real estate | 2025 |
| M K Enterprise (UK) Holding Limited | Financial services | 2016 |
| M K Enterprise (UK) Ltd | Real estate | 2007 |
| M R Chauffeur Services Limited | Transport & logistics | 2010 |
| M R Market Ltd | Wholesale & retail | 2025 |
| M S Windows & Conservatories Ltd | Construction | 2014 |
| M U Shohel Trading UK Ltd | Wholesale & retail | 2025 |
| M&A (London) Building Limited | Construction | 2024 |
| M&C Global Solutions UK Ltd | Information & communication | 2025 |
| M&D UK Trading Ltd | Transport & logistics | 2021 |
| M&D Wealth Ltd | Hospitality | 2024 |
| M&E Services (Mechanical and Electrical) Limited | Professional & scientific | 2003 |
| M&M Medicare Limited | Health & social care | 2016 |
| M&N Uyanik Investments Limited | Real estate | 2024 |
| M&N Uyanik Limited | Financial services | 2018 |
| M&R Well Health Ltd | Health & social care | 2026 |
| M&S London Limited | Real estate | 2017 |
| M&S Properties Portfolio Ltd | Real estate | 2022 |
| M.A.I Properties London Ltd | Real estate | 2024 |
| M.Hall Heating Limited | Construction | 2009 |
| M.J. Construction Services Limited | Construction | 2007 |
| M.T E-Commerce Group Ltd | Wholesale & retail | 2025 |
| M.Udroiu Ltd | Transport & logistics | 2026 |
| M/S EMI Engineering Ltd | Professional & scientific | 2018 |
| M3 Facilities Services Limited | Administrative & support | 2025 |
| M44 Homes Ltd | Real estate | 2019 |
| MA Arshad Ltd | Transport & logistics | 2022 |
| MA UK Motors Ltd | Wholesale & retail | 2019 |
| MAA Properties Ltd | Real estate | 2021 |
| Maan Accountancy Ltd | Professional & scientific | 2022 |
| Maan Consultancy Ltd | Professional & scientific | 2018 |
| Maan Consultants Limited | Administrative & support | 2010 |
| Maan Properties Ltd | Real estate | 2010 |
| Maan Trading Ltd | Transport & logistics | 2019 |
| Maas Building Cleaning Services Ltd | Administrative & support | 2026 |
| Maas Traders UK Limited | Transport & logistics | 2020 |
| MAC 46 Limited | Wholesale & retail | 2024 |
| Mackellar House Limited | Construction | 2022 |
| Madatamina Healthcare Ltd | Health & social care | 2012 |
| Madhushalini Limited | Information & communication | 2017 |
| Maepaul Ltd | Other services | 2018 |
| Maeron Ltd | Administrative & support | 2020 |
| Magbol UK Ltd | Health & social care | 2009 |
| Magic UK WOK Ltd | Hospitality | 2022 |
| Magma Consultancy Services Ltd | Information & communication | 2019 |
| Magni Constructions Ltd | Construction | 2026 |
| Magrec Limited | Manufacturing | 1974 |
| MAH Capital Ltd | Real estate | 2025 |
| Mahaba Limousine Limited | Transport & logistics | 2026 |
| Mahanth Limited | Information & communication | 2013 |
| Mahappa UK Ltd | Wholesale & retail | 2020 |
| Mahas Design Ltd | Wholesale & retail | 2017 |
| Mahdi Associates Ltd | Transport & logistics | 2014 |
| Mail Box Center Ltd | Other services | 2018 |
| Mailiq Ltd | Information & communication | 2023 |
| Mailosi Care Ltd | Health & social care | 2014 |
| Main Care Solutions Ltd | Administrative & support | 2025 |
| Maison Renard Ltd | Hospitality | 2025 |
| Maizbaan Ltd | Hospitality | 2024 |
| Majid and Sons (Service Stations) Limited | Wholesale & retail | 2004 |
| Majid&Co LLP | | 2021 |
| MAK London Services Ltd | Transport & logistics | 2024 |
| Maka Global Limited | Wholesale & retail | 2010 |
| Maka London Ltd | Wholesale & retail | 2015 |
| Maka Marketing Ltd | Wholesale & retail | 2017 |
| MAL Trading Ltd | Transport & logistics | 2021 |
| Malden Cars Ltd | Transport & logistics | 2019 |
| Malik Empires Ltd | Wholesale & retail | 2019 |
| Malik Heating Services Ltd | Construction | 2023 |
| Malik Residential Property (UK) Ltd | Real estate | 2021 |
| Malik Riaz and Sons Ltd | Construction | 2023 |
| MAM Entertainment Ltd | Professional & scientific | 2023 |
| MAM London Trading Ltd | Transport & logistics | 2017 |
| Mamas Property Investment Ltd | Real estate | 2017 |
| Mamomi Initiative C.I.C. | Education | 2010 |
| MAN Trading Ltd | Transport & logistics | 2021 |
| MAN4SECURITY Limited | Construction | 2010 |