| Loppy Digital Limited | Information & communication | 2025 |
| Loulou Locations Ltd | Professional & scientific | 2006 |
| Love From Lola Limited | Wholesale & retail | 2020 |
| Lovelace and Green Ltd | Wholesale & retail | 2022 |
| LOW Pressure Consulting Ltd | Professional & scientific | 2026 |
| Loxima Limited | Information & communication | 2016 |
| Loxville Limited | Real estate | 2024 |
| LPH Contracting Limited | Construction | 1999 |
| LTA Construction Ltd | Construction | 2019 |
| LTS Property Services LLP | | 2004 |
| LTV Ltd | Professional & scientific | 2020 |
| Lubella Limited | Information & communication | 2015 |
| Lubiss Limited | Professional & scientific | 2014 |
| Luca Consulting Services Limited | Professional & scientific | 2024 |
| Lucentracare Ltd | Health & social care | 2025 |
| Lucey Contracting Ltd | Administrative & support | 2011 |
| Lucky 8 PR Limited | Professional & scientific | 2014 |
| Lumina Visuals Ltd | Information & communication | 2026 |
| Luna and Wick Ltd | Wholesale & retail | 2020 |
| Lunch Box (2001) Ltd. | Hospitality | 2001 |
| Lushomo Communications Ltd | Professional & scientific | 2016 |
| LUX Barbers Leatherhead Ltd | Other services | 2023 |
| Luxewellness Spa Limited | Construction | 2020 |
| Luxora Worldwide Ltd | Wholesale & retail | 2025 |
| Lycans GAS Utilities Limited | Construction | 2016 |
| Lyndhurst Court (Sutton) Residents Association Limited | Households | 1961 |
| Lynx Hill Residents (East Horsley) Limited | Households | 2017 |
| Lyons Development Group Ltd | Households | 2026 |
| M D H Projects Ltd | Construction | 2015 |
| M Financial Limited | Financial services | 2026 |
| M&C Cafe Limited | Hospitality | 2026 |
| M&Fj Ltd | Real estate | 2024 |
| M&Tplumbingandheating Ltd | Construction | 2022 |
| M.A.S. Property Limited | Real estate | 2007 |
| M27CDD Ltd | Information & communication | 2023 |
| M2M2 Limited | Education | 2024 |
| Macdonald Fencing & Sons Ltd | Construction | 2014 |
| Machine Vision Ltd | Information & communication | 2012 |
| Madaju Construction Ltd | Construction | 2023 |
| Maddox Construction Services Limited | Construction | 2010 |
| Made by MIA Limited | Hospitality | 2025 |
| Made to Measure Mentoring Limited | Education | 2017 |
| MAF Engineering Ltd | Financial services | 2007 |
| MAG Group Scaffolding Ltd | Other services | 2018 |
| MAG Living Spaces Ltd | Real estate | 2024 |
| Magic Ponies Limited | Arts & recreation | 2022 |
| Magis Solutions Ltd | Professional & scientific | 2012 |
| Magma London Ltd | Manufacturing | 2014 |
| Magnum Cars & Carriages Limited | Transport & logistics | 2015 |
| Maha Nandini Traders Ltd | Hospitality | 2024 |
| Maicon Associates Limited | Professional & scientific | 1999 |
| MAIDS4CLEANING Limited | Administrative & support | 2012 |
| Mainframed Ltd | Professional & scientific | 2014 |
| Maison LE MAS Ltd | Professional & scientific | 2022 |
| Maitland Close Residents Company Limited | Households | 1998 |
| Maltby Asset Management Limited | Real estate | 2025 |
| Malykhin & Co Ltd | Administrative & support | 2020 |
| Mamavito Limited | Hospitality | 2023 |
| Mamushka Limited | Extraterritorial | 2009 |
| Management Business Solutions Limited | Professional & scientific | 2018 |
| Maninvest Limited | Real estate | 1996 |
| Manitserve Limited | Professional & scientific | 2002 |
| Manor Close East Horsley Residents' Association Limited | Other services | 1970 |
| Manor Court (Sutton) Housing Association Limited | Households | 1994 |
| Manor Court Residents Company Limited | Households | 1993 |
| Manor Park Properties Limited | Real estate | 2016 |
| Mansfield Holding Limited | Professional & scientific | 2019 |
| Mansion House Management International Ltd. | Administrative & support | 2016 |
| MAP International Limited | Manufacturing | 2022 |
| MAP Promotions Limited | Manufacturing | 2024 |
| Maple Grove Bookham Management Limited | Extraterritorial | 2007 |
| Marchsec Ltd | Professional & scientific | 2021 |
| Marco JOE Fazio Ltd | Professional & scientific | 2019 |
| Marion Court RTM Limited | Households | 2008 |
| Mario’S Woodworks Ltd | Construction | 2020 |
| Mark Cooke Creative Services Ltd | Professional & scientific | 2024 |
| Mark Foster Limited | Information & communication | 2005 |
| Mark Nugent Electrical Services Limited | Information & communication | 2012 |
| Mark Olyott Electrical Services Ltd | Construction | 2019 |
| Marlan Glenn Associates Ltd | Professional & scientific | 2022 |
| Marlborough House (Leatherhead) Limited | Households | 2009 |
| Marper Ventures Limited | Professional & scientific | 2021 |
| Marsh Real Estate Limited | Real estate | 2025 |
| Martial X Academy (Woking) Ltd | Education | 2023 |
| Martin Matthews Consultants Limited | Professional & scientific | 1982 |
| Martindale Freehold Ltd | Real estate | 2022 |
| Martins Electrics Limited | Construction | 2009 |
| Marula Properties Limited | Construction | 2020 |
| Marvel Plumbing and Heating Ltd | Construction | 2026 |
| Maske Estates Limited | Real estate | 2016 |
| Mason Byrne Ltd | Real estate | 2026 |
| Masonmaritime Ltd | Professional & scientific | 2023 |
| Material Hangout Limited | Wholesale & retail | 2023 |
| Maths Academy Limited | Education | 2007 |
| Matortho Group Holdings Limited | Professional & scientific | 2020 |
| Matortho Holdings Limited | Financial services | 2021 |
| Matortho Limited | Health & social care | 2010 |
| Matt the Sash Ltd | Construction | 2025 |
| Matthew P Evans Limited | Professional & scientific | 2014 |
| Matthews & Partners Ltd | Professional & scientific | 1995 |