| Lttr Consultancy Ltd | Professional & scientific | 2025 |
| Lucas Grant Ltd | Manufacturing | 2018 |
| Lucent Leader Limited | Professional & scientific | 2024 |
| Lucie Harrington Limited | Other services | 2018 |
| Lucky Dog Film Production Limited | Information & communication | 2018 |
| Lucy Laura Limited | Information & communication | 2025 |
| Ludens Electronics Ltd | Wholesale & retail | 2022 |
| Luigi Bidco Limited | Professional & scientific | 2017 |
| Luigi Debtco Limited | Professional & scientific | 2017 |
| Luigi EBT Limited | Financial services | 2020 |
| Luigi Midco Limited | Professional & scientific | 2017 |
| Luigi Topco Limited | Professional & scientific | 2017 |
| Luke Madden Limited | Financial services | 2014 |
| Lume Studios Consulting Ltd | Information & communication | 2020 |
| Lumico Limited | Professional & scientific | 2012 |
| LUX Nails Farnham Ltd | Other services | 2025 |
| LUX7 Lighting Design Ltd | Construction | 2024 |
| Luxe Auto Limited | Other services | 2020 |
| Luxe Connection Ltd | Professional & scientific | 2024 |
| Lyceum Developments Limited | Households | 1997 |
| Lydia Allen Interiors Ltd | Professional & scientific | 2020 |
| Lydia London Limited | Other services | 2024 |
| Lynch Lane Management (Lambourn) Limited | Households | 2000 |
| Lynch Road (Farnham) Management Company Limited | Administrative & support | 2010 |
| Lynqit Ltd | Financial services | 2024 |
| Lysaght Equestrian Ltd | Agriculture & fishing | 2023 |
| M & C Doust Limited | Information & communication | 2019 |
| M & M Construction Design and Build Ltd | Construction | 2012 |
| M and J AMP Holdings Limited | Financial services | 2026 |
| M Booth Consulting Ltd | Information & communication | 2023 |
| M Booth Property Ltd | Real estate | 2026 |
| M D W Consulting Solutions Ltd | Professional & scientific | 2022 |
| M E R Consulting Ltd | Professional & scientific | 2019 |
| M Goode Ltd | Transport & logistics | 2023 |
| M J Gilbert Ltd. | Construction | 2011 |
| M J Riley Limited | Wholesale & retail | 2002 |
| M R Leggett Limited | Construction | 2003 |
| M S Electrical Services (Farnham) Limited | Construction | 2002 |
| M&D Partnership Limited | Real estate | 2025 |
| M&E Rental Properties Ltd | Real estate | 2023 |
| M&K Technical Services Ltd | Wholesale & retail | 2025 |
| M&M Pepperpot Hospitality Ltd | Hospitality | 2017 |
| M&P International (UK) Limited | Manufacturing | 2000 |
| M&S Trees Limited | Agriculture & fishing | 2018 |
| M-Tech Engineering Solutions Ltd | Construction | 2004 |
| M-Tech Holdings Limited | Financial services | 2015 |
| M.B. Garden Buildings Limited | Manufacturing | 2007 |
| M.B.Electrical Services (Surrey) Limited | Construction | 2014 |
| M.C.H. (Beckton) Management Company Limited | Households | 1982 |
| M.P.L. Building Services Limited | Manufacturing | 1998 |
| Maandishi Limited | Administrative & support | 2012 |
| Maase Group Limited | Professional & scientific | 2018 |
| MAC Collective Limited | Wholesale & retail | 2026 |
| Macallan Consulting Limited | Information & communication | 2013 |
| Macandrew Duncan Limited | Professional & scientific | 2014 |
| Macgregor Portfolio Limited | Real estate | 2024 |
| Machinery Solutions&Consultants Limited | Wholesale & retail | 2004 |
| Mack Rentals Limited | Hospitality | 2024 |
| Mackenzie Financial Management Limited | Financial services | 2006 |
| Macklow Smith Limited | Manufacturing | 2008 |
| Maclean Electrical Contractors Ltd | Construction | 2023 |
| Macleod Developments Limited | Real estate | 1997 |
| Macro Supply Co Ltd | Manufacturing | 2025 |
| MAD About Skiing Limited | Extraterritorial | 2012 |
| Made With Love Movie Club Limited | Information & communication | 2015 |
| Madimoo Ltd | Wholesale & retail | 2016 |
| Madina Construction Limited | Wholesale & retail | 2009 |
| MAG Holdings Limited | Real estate | 1986 |
| Magna Collection Ltd | Manufacturing | 2021 |
| Magone Digital Limited | Information & communication | 2026 |
| Mahay Consulting Services Ltd | Professional & scientific | 2021 |
| Mahony Scaffolding Services Limited | Real estate | 2016 |
| Maidwell Projects Limited | Financial services | 2019 |
| Main Media & Training Ltd | Information & communication | 2023 |
| Mainsail Accounting and Consulting Limited | Professional & scientific | 2023 |
| Maison Eleve Limited | Construction | 2026 |
| Maison Restaurant Ltd | Hospitality | 2021 |
| Maitlandqs (Holdings) Limited | Professional & scientific | 2008 |
| Maitlandqs 2023 Limited | Professional & scientific | 2023 |
| Maitlandqs Limited | Professional & scientific | 1989 |
| Majestic Journeys Ltd | Wholesale & retail | 2024 |
| Majlis Ansarullah (UK) Ltd | Health & social care | 2009 |
| Majlis Khuddamul Ahmadiyya (UK) | Other services | 2010 |
| Makmillio Tech Ltd | Health & social care | 2022 |
| Mali Properties Limited | Real estate | 2015 |
| Malibu Securities Limited | Professional & scientific | 2010 |
| Malki Healthcare Solutions Ltd | Health & social care | 2020 |
| Malthouse Court Limited | Households | 1986 |
| Mama MIA Restaurant Limited | Hospitality | 2006 |
| Mama’S Wagon Limited | Hospitality | 2025 |
| Mamdani Opticians Limited | Wholesale & retail | 1999 |
| Mammal Swag Ltd | Wholesale & retail | 2022 |
| Manage BO Limited | Administrative & support | 2013 |
| Manage DT Limited | Administrative & support | 2013 |
| Manage NND Limited | Administrative & support | 2011 |
| Management Intelligence Ltd | Professional & scientific | 1997 |
| Manda Software Services Limited | Information & communication | 2022 |
| Mandarin Court Residents Association Ltd | Real estate | 1999 |
| Manfield Family Office Ltd | Financial services | 2025 |
| Mango Sunrise Limited | Education | 2014 |