| Lyca Ltd | Health & social care | 2022 |
| Lyco Limited | Real estate | 2026 |
| Lyde Green Management Company Limited | Households | 2015 |
| Lymeberry Limited | Information & communication | 2015 |
| Lymington Carter Limited | Administrative & support | 2020 |
| LYN Academy Ltd | Information & communication | 2016 |
| Lync Recruitment Ltd | Administrative & support | 2015 |
| Lynch on Blindness Limited | Public administration | 2025 |
| Lyndhurst Court RTM Company Limited | Households | 2009 |
| Lyndhurst Property Services Limited | Households | 2004 |
| Lyngrove Management Limited | Households | 1995 |
| Lyniemo Franelius Ellis Ltd | Health & social care | 2025 |
| Lynn's Creations | Other services | 2015 |
| Lynwood Court (Horsham) Management Company Limited | Households | 1990 |
| Lynworth (UK) Limited | Administrative & support | 2005 |
| Lynx UK Solutions Limited | Administrative & support | 2007 |
| Lynxway Limited | Other services | 2024 |
| Lyra Estates Ltd | Real estate | 2022 |
| Lysander Mews Residents Management Company Limited | Households | 2012 |
| Lyte Charging Limited | Other services | 2019 |
| Lyttelton Court 1 14-34A RTM Company Limited | Households | 2011 |
| Lyttelton Court 2 35-48A RTM Company Limited | Households | 2011 |
| Lyttelton Court 3 49-69A RTM Company Limited | Households | 2011 |
| Lyttelton Court RTM Company Limited | Households | 2011 |
| Lyttelton Rock Limited | Health & social care | 2009 |
| LZ Technology Ltd | Financial services | 2011 |
| M & a Tappers Limited | Construction | 2016 |
| M & H Management Limited | Professional & scientific | 2025 |
| M & H Properties London Limited | Construction | 2015 |
| M & H Shop Repair Centre Ltd | Other services | 2018 |
| M & J Contract Development Limited | Construction | 2009 |
| M & J Gant Property Ltd | Real estate | 2024 |
| M & L Property Maintenance Ltd | Construction | 2025 |
| M & N Roofing MK Ltd | Construction | 2023 |
| M & R Properties Limited | Real estate | 2016 |
| M & R Retail Limited | Wholesale & retail | 2011 |
| M & S Rawal Properties Limited | Real estate | 2025 |
| M & Z Rugs Shop Ltd | Wholesale & retail | 2025 |
| M a H UK Transport Ltd | Transport & logistics | 2006 |
| M a Roberts & Sons Ltd | Construction | 2011 |
| M and M Care Support Limited | Administrative & support | 2021 |
| M B Empire Limited | Other services | 2018 |
| M Busy Cleaning Ltd | Administrative & support | 2026 |
| M C (Croydon) Management Company Limited | Households | 1989 |
| M D H Business Advisers Limited | Professional & scientific | 2009 |
| M Halford Consulting Limited | Professional & scientific | 2023 |
| M Jones & Co. Limited | Construction | 1996 |
| M KAY Consultant Ltd | Professional & scientific | 2012 |
| M Khan ENT Ltd | Health & social care | 2024 |
| M N S Developers Ltd | Real estate | 2017 |
| M N S Property Limited | Real estate | 2004 |
| M P Wharmby Limited | Construction | 2009 |
| M R Scaffolding Services Ltd | Construction | 2014 |
| M Rail Ltd | Construction | 2025 |
| M V Formwork Ltd | Professional & scientific | 2014 |
| M Yelding Ltd | Construction | 2019 |
| M&A Accounting Services Ltd | Professional & scientific | 2025 |
| M&A Wholesale and Catering Ltd | Wholesale & retail | 2022 |
| M&D Business Management Consultancy Limited | Professional & scientific | 2019 |
| M&F Solutions Ltd | Manufacturing | 2025 |
| M&H Removals Ltd | Transport & logistics | 2026 |
| M&J Houseware Ltd | Other services | 2026 |
| M&K Carpentry (South) Ltd | Manufacturing | 2025 |
| M&K Supermarket (Sweets) Limited | Wholesale & retail | 2025 |
| M&K Training Ltd | Education | 2021 |
| M&M Impero Ltd | Construction | 2024 |
| M&S Lettings Property Ltd | Real estate | 2019 |
| M&S 2007 Limited | Transport & logistics | 2025 |
| M&S Business Associates Limited | Wholesale & retail | 2018 |
| M&S Land Holdings Ltd | Real estate | 2023 |
| M&V Property Investments Ltd | Real estate | 2022 |
| M-Bay Trading Limited | Wholesale & retail | 2005 |
| M-Click Limited | Wholesale & retail | 2024 |
| M. S. Electrical Services (UK) LLP | | 2010 |
| M.A Abode Ltd | Real estate | 2022 |
| M.A.T. Property Developers Ltd | Real estate | 2026 |
| M.Ade Collection Ltd | Wholesale & retail | 2020 |
| M.D.Catharina Electrical Ltd | Energy | 2022 |
| M.D.J. Associates Limited | Other services | 2004 |
| M.E. Duffell Limited | Wholesale & retail | 1972 |
| M.G. Electrics Limited | Construction | 2001 |
| M.I Electrical & Data Limited | Construction | 2002 |
| M.I.B. Card Ltd | Financial services | 2021 |
| M.J. Layman Electrical Limited | Construction | 2015 |
| M.K & Sons Builders Limited | Construction | 2024 |
| M.K. London Holdings Limited | Information & communication | 2022 |
| M.P. Marek Ltd | Transport & logistics | 2022 |
| M.R. Squared Ltd | Professional & scientific | 2009 |
| M.S-2 Stores Limited | Wholesale & retail | 2004 |
| M.S. Cobra Construction Limited | Construction | 2013 |
| M.S. Food Hygiene Training Ltd | Education | 2004 |
| M.Z.R. Engineering (Europe) Limited | Professional & scientific | 1984 |
| M/S Shadan & Co. Ltd | Professional & scientific | 2026 |
| M1 Barbers Limited | Other services | 2022 |
| M2M Park Management Company Limited | Households | 2018 |
| M4JAMAICANCUISINE Limited | Hospitality | 2026 |
| M99 Consultancy Services Limited | Professional & scientific | 2018 |
| MA & Co Accountants Limited | Professional & scientific | 2022 |
| MA SAS Raja Limited | Real estate | 2025 |
| MA Tranport Services Ltd | Transport & logistics | 2024 |