| Lotus Care Management Services Limited | Health & social care | 2014 |
| Lotus Care Paisley Court Ltd | Health & social care | 2024 |
| Lotus Care Raleigh Court Ltd | Health & social care | 2024 |
| Lotus Enterprise Ltd | Wholesale & retail | 2025 |
| Lotus Group Holdings Limited | Health & social care | 2017 |
| Lovely Corp Limited | Wholesale & retail | 2024 |
| LOW Price Store Limited | Wholesale & retail | 2010 |
| LPM Works Ltd | Construction | 2023 |
| LRK Solutions Ltd | Information & communication | 2026 |
| LT GAS Limited | Construction | 2021 |
| LTA London Ltd | Hospitality | 2016 |
| LU Swaa Limited | Real estate | 2020 |
| Luca & SON Limited | Construction | 2015 |
| Lucia Residential Ltd | Health & social care | 2024 |
| Lucky Convenience Ltd | Wholesale & retail | 2026 |
| Lucky Strike Competition Ltd | Wholesale & retail | 2025 |
| Luckys Lootbox Ltd | Wholesale & retail | 2026 |
| Lukasz MKS Ltd | Transport & logistics | 2017 |
| Lukasz Window Cleaning Limited | Administrative & support | 2024 |
| Lumoss Ltd | Professional & scientific | 2023 |
| LUX CR Autos Limited | Wholesale & retail | 2025 |
| Luxerior Chauffeur Group Limited | Transport & logistics | 2025 |
| Luxor Property Investment Ltd | Real estate | 2026 |
| Luxury Design Tailors Ltd | Other services | 2013 |
| Luxury Level General Trading Ltd | Real estate | 2024 |
| Luxury Limo Taxi Ltd | Transport & logistics | 2026 |
| Luxury Travel Services Ltd | Administrative & support | 2019 |
| Luxx Inc Ltd | Wholesale & retail | 2021 |
| Lwazii Ltd | Health & social care | 2020 |
| Lyonia Lucida VT Ltd | Administrative & support | 2024 |
| M & a Stores Limited | Wholesale & retail | 2016 |
| M & M Foods London Ltd | Wholesale & retail | 2019 |
| M & N UK Traders Ltd | Wholesale & retail | 2025 |
| M Hoxha Ltd | Information & communication | 2026 |
| M Karam Ltd | Real estate | 2021 |
| M Property Care Ltd | Administrative & support | 2026 |
| M&A Construction and Building Ltd | Construction | 2023 |
| M&M Construction 4U Ltd | Construction | 2016 |
| M&M GBS Ltd | Construction | 2016 |
| M&S Medicare Ltd | Health & social care | 2021 |
| M&V Trans Ltd | Transport & logistics | 2026 |
| M'All Interiors Ltd | Construction | 2019 |
| M. R. Gokani Limited | Wholesale & retail | 2004 |
| M.H. Beauty Supply Limited | Wholesale & retail | 2010 |
| M4 Handyman Ltd | Other services | 2025 |
| M4M Facilities Ltd | Administrative & support | 2026 |
| M4M Group Ltd | Wholesale & retail | 2019 |
| M6 Property Ltd | Real estate | 2025 |
| MA Service Station Ltd | Wholesale & retail | 2024 |
| Ma-Domi Ltd | Construction | 2024 |
| Maadsa Limited | Information & communication | 2025 |
| Maak Industries Ltd | Wholesale & retail | 2020 |
| MAC & Young Ltd | Transport & logistics | 2004 |
| MAC Flooring Ltd | Construction | 2019 |
| MAC Fuels and Retail Limited | Wholesale & retail | 2016 |
| Madan Brother’S Investment Limited | Real estate | 2025 |
| Maggi Foods Limited | Wholesale & retail | 2007 |
| Magic Staircases Ltd | Construction | 2022 |
| Magik Trading Ltd | Manufacturing | 2023 |
| Magnificent Services Ltd | Health & social care | 2013 |
| Magnum Analysis Limited | Professional & scientific | 1994 |
| Mahesh Group Ltd | Education | 2023 |
| Mainstage Hire Limited | Administrative & support | 2026 |
| Maintenance Pro Ltd | Other services | 2021 |
| Maison Modernè Studio Ltd | Professional & scientific | 2025 |
| Maja Polish Deli Limited | Wholesale & retail | 2007 |
| MAK Global Group Ltd | Professional & scientific | 2020 |
| Making Connections Work Limited | Professional & scientific | 2012 |
| Malayalee Muslim Cultural & Welfare Association (UK) | Other services | 2005 |
| Malin Commercial Ltd | Wholesale & retail | 2023 |
| MAM Intercontinental Ltd | Manufacturing | 2019 |
| Mamma Marketing Limited | Other services | 2023 |
| Mancini Consultancy Ltd | Wholesale & retail | 2026 |
| Mandala London Ltd | Manufacturing | 2018 |
| Manea Capital Limited | Other services | 2026 |
| Mangat Roofing & Building Ltd | Construction | 2019 |
| Mango Rentals Ltd | Real estate | 2025 |
| Mannat Limited | Wholesale & retail | 2010 |
| Mannat Real Estate Ltd | Real estate | 2018 |
| Manoj Visuals Ltd | Other services | 2025 |
| Manolia Ltd | Hospitality | 2025 |
| Manor Croft Freehold Limited | Hospitality | 2010 |
| Manraj Empire Constructions Ltd | Construction | 2025 |
| Mansab Refrigeration Ltd | Manufacturing | 2020 |
| Mansfield Service Station Ltd | Wholesale & retail | 2023 |
| Mantar Ltd | Wholesale & retail | 2025 |
| Mantegh Ltd | Manufacturing | 2024 |
| Mantiq Ltd | Professional & scientific | 2014 |
| Manu's Fragrances Ltd | Wholesale & retail | 2025 |
| Manwithdvan Ltd | Transport & logistics | 2025 |
| Maokomavi Ltd | Health & social care | 2014 |
| Mapdevelopments Ltd | Construction | 2025 |
| Marasli Ltd | Hospitality | 2017 |
| Marayah Property Group Ltd | Real estate | 2025 |
| Marbud Construction Ltd | Construction | 2013 |
| Marbud Group Ltd | Construction | 2023 |
| Margot Construction Ltd | Administrative & support | 2017 |
| Marius Construction Work Ltd | Construction | 2024 |
| Markpoint Limited | Wholesale & retail | 2025 |
| Marlo Holdings Limited | Financial services | 2021 |