| Llan Ltd | Professional & scientific | 2024 |
| LLC Leasehold Limited | Real estate | 2025 |
| LM Promotions Limited | Arts & recreation | 2023 |
| LM Property (NE) Limited | Real estate | 2026 |
| Lockett Block Management Limited | Real estate | 2012 |
| Lockett Estates Limited | Real estate | 2012 |
| Lockett International Limited | Real estate | 2015 |
| Lockett Investments Limited | Financial services | 2012 |
| Lockett Spain Limited | Real estate | 2015 |
| Lodgespace Ltd | Construction | 2024 |
| London Pain Management Ltd | Health & social care | 2015 |
| Longboyds Residents' Association (Cobham) Limited | Households | 1992 |
| Loop Songs Limited | Information & communication | 2017 |
| Lorie Umali Ltd | Households | 2025 |
| Loriners Residents Company Limited | Households | 1999 |
| LS Builders Ltd | Construction | 2010 |
| LSC Academy Limited | Arts & recreation | 2025 |
| LSC26 Limited | Arts & recreation | 2023 |
| Luke Littler Darts Limited | Arts & recreation | 2024 |
| Luminor Risk Limited | Professional & scientific | 2025 |
| Luna Mora Limited | Professional & scientific | 2025 |
| Luxe Smart Homes Limited | Administrative & support | 2017 |
| Luxury Mosaic Art by Anda Ltd | Manufacturing | 2019 |
| LV8SPORT Limited | Arts & recreation | 2017 |
| LWO Properties Limited | Real estate | 2026 |
| Lyder Properties Limited | Real estate | 2021 |
| M C Squared Limited | Professional & scientific | 1993 |
| M Hicks Limited | Professional & scientific | 2015 |
| M Rollins Plumbing & Heating Limited | Construction | 2012 |
| M&H Squared Ltd | Real estate | 2020 |
| M.A. Property Management Limited | Real estate | 1998 |
| M.F Cleaning Service Ltd | Other services | 2014 |
| M.L.P Advisors (UK) Limited | Construction | 2021 |
| M2E Tech Limited | Professional & scientific | 2025 |
| M@Verick Limited | Information & communication | 1998 |
| MA2 Image Limited | Administrative & support | 2019 |
| Macgechan Film Services Ltd | Information & communication | 2026 |
| Madiera Learning Ltd | Education | 2025 |
| Mai-Mai &SON Scaffolding Ltd | Construction | 2021 |
| Makes SEN5E Ltd | Other services | 2024 |
| Malcolm Burgess Limited | Real estate | 2002 |
| Maloal Limited | Professional & scientific | 2021 |
| Manor Court Residents' Association Limited | Real estate | 1959 |
| Marbledye Limited | Construction | 1994 |
| Marcap Holdings Limited | Financial services | 2022 |
| Marc’S Canine Companions Limited | Other services | 2025 |
| Mark Stevenson TV Ltd | Information & communication | 2015 |
| Market Close (Keswick Road) Residents Management Company Limited | Households | 2017 |
| Martin & Pleasance UK Limited | Wholesale & retail | 2011 |
| Martin Transformation Advisory Ltd | Professional & scientific | 2026 |
| Mary Hackett & Associates Limited | Professional & scientific | 2003 |
| Matchedmedia Ltd | Professional & scientific | 2025 |
| Mathieu Chaze Photography Ltd | Professional & scientific | 2019 |
| Maths Inspiration Limited | Education | 2013 |
| Matrix Pro Services Limited | Information & communication | 2025 |
| Mattosuk Multi Services Ltd | Construction | 2022 |
| Maunder Taylor Simmonds Ltd | Professional & scientific | 2025 |
| Maybridge Associates Ltd | Administrative & support | 2016 |
| Mayflower Residential Limited | Real estate | 2018 |
| MCG Lifestyle Ltd | Wholesale & retail | 2025 |
| Mckenzie Management Limited | Professional & scientific | 1987 |
| Mcmillan Properties Ltd | Real estate | 2016 |
| Mcneil Group Holdings Limited | Financial services | 2025 |
| Meck Management Ltd | Professional & scientific | 2025 |
| Medapti Ltd | Wholesale & retail | 2013 |
| Medic Testing Limited | Health & social care | 2020 |
| Medident (UK) Ltd | Manufacturing | 2002 |
| Megwich Ltd | Information & communication | 2016 |
| Mehrya Ltd | Wholesale & retail | 2026 |
| Melisa Diagnostics Limited | Professional & scientific | 2005 |
| Meliso Limited | Professional & scientific | 2017 |
| Merchant Ventures Investments Limited | Financial services | 2005 |
| Meridian Waterside (Southampton) Management Company Limited | Households | 2017 |
| Mesh Systems Europe Limited | Construction | 2018 |
| Meta Trading Limited | Wholesale & retail | 2021 |
| Metro Marketing Limited | Information & communication | 2019 |
| Metroduct Ltd | Construction | 2022 |
| Mexfield Investments Limited | Real estate | 2025 |
| MGH Technology Solutions Limited | Real estate | 1996 |
| MH Rental Estates Limited | Real estate | 2023 |
| MHC Group Limited | Professional & scientific | 2005 |
| Middle Earth Holdings Limited | Professional & scientific | 2024 |
| Middlemass James Limited | Construction | 2026 |
| Midlothian Capital Partners Limited | Financial services | 2015 |
| Midmoor Limited | Arts & recreation | 2018 |
| MIG Partners LLP | | 2022 |
| Migration Studios Ltd | Information & communication | 2023 |
| Mihin Limited | Real estate | 2025 |
| Mike Turner Car Repairs Ltd. | Wholesale & retail | 2003 |
| Mill Road Technology Limited | Information & communication | 2017 |
| Mill View (Cobham) Management Company Limited | Households | 2011 |
| Millennial Sports Management Ltd | Professional & scientific | 2018 |
| Millesime 1990 Escapes Limited | Administrative & support | 2025 |
| Millesime 1990 Fine Wines Limited | Wholesale & retail | 2026 |
| Millesime 1990 Holdings Limited | Financial services | 2025 |
| Mimos Courier Services LP | | 2008 |
| Mind Blossom and Bloom Ltd | Public administration | 2023 |
| Minerva International Education Limited | Education | 2022 |
| Minerva Land Limited | Real estate | 2025 |
| Minerva Private Homes Ltd | Administrative & support | 2019 |