| London and Surrey Psychology Clinic Ltd | Health & social care | 2014 |
| London Basement Pumps Limited | Construction | 2018 |
| London Capital Inventories Limited | Households | 2020 |
| London Capital Services Ltd | Administrative & support | 2023 |
| London College of Chinese Medicine Ltd | Education | 2018 |
| London Consultant Services Ltd | Professional & scientific | 2026 |
| London Energys Solutions Ltd | Wholesale & retail | 2018 |
| London FOX Limited | Hospitality | 2021 |
| London Gastroenterology Consultancy LLP | | 2013 |
| London Gastroenterology Services Ltd | Health & social care | 2009 |
| London House, Property Management Company Limited | Households | 1993 |
| London Line Associates Limited | Information & communication | 1996 |
| London Master Painter Ltd | Construction | 2025 |
| London Renewable Energy Ltd | Construction | 2018 |
| London Tamil Academy Limited | Health & social care | 2024 |
| London Tamil Humour Club Ltd | Other services | 2026 |
| London's Exceptional Warriors Ltd | Health & social care | 2019 |
| Londoncape Limited | Real estate | 2012 |
| Lonesome Dog Films Ltd | Information & communication | 2013 |
| Lonesome Dog Holdings Ltd | Financial services | 2026 |
| Lonesome Dog Records Limited | Information & communication | 2014 |
| Lonesome Dog Ventures Ltd | Financial services | 2026 |
| Longley Architecture Limited | Professional & scientific | 2013 |
| Lonvey Ltd | Real estate | 2021 |
| Lore Consultants Limited | Information & communication | 2024 |
| Loreto Technology Limited | Information & communication | 2022 |
| Lorino Associates Limited | Professional & scientific | 2010 |
| Loro Piana Art Consultancy Limited | Other services | 2024 |
| LOS Santos Ltd | Transport & logistics | 2015 |
| Louis Company Ltd | Professional & scientific | 2024 |
| Love IS a Cupcake Limited | Hospitality | 2016 |
| Lovehill Ltd | Agriculture & fishing | 2025 |
| Lovelace Long Ditton Limited | Households | 1992 |
| Lowcourier Ltd | Construction | 2019 |
| LR Offshore Engineering Ltd | Professional & scientific | 2024 |
| LRB Southern Services Ltd | Construction | 2025 |
| Lsmad Ltd | Information & communication | 2026 |
| LSP Safe Home Mortgage Ltd | Construction | 2025 |
| Lstnup International Ltd | Information & communication | 2024 |
| LSX Construction Ltd | Construction | 2024 |
| LT Structures Ltd | Construction | 2022 |
| Ltd Connect International Limited | Professional & scientific | 2022 |
| Ltd Connect Tax Services Limited | Professional & scientific | 2018 |
| LUA Properties Limited | Real estate | 2021 |
| Luben HR Consulting Ltd | Other services | 2011 |
| Lucero Ltd | Real estate | 2023 |
| Lucie Bird Limited | Health & social care | 2025 |
| LUCKY71 Ltd | Transport & logistics | 2023 |
| Lucy Down Photography Limited | Professional & scientific | 2011 |
| Lucy White Ltd | Other services | 2012 |
| Lucyd Business Consulting Ltd | Professional & scientific | 2025 |
| Luigi Pet Supplies Limited | Wholesale & retail | 2026 |
| Lulu Langtree Limited | Professional & scientific | 2009 |
| Luma House Ltd | Other services | 2025 |
| Lumanai Recruitment Ltd | Information & communication | 2023 |
| Lumox Ltd | Manufacturing | 2025 |
| Lumoz Ltd | Real estate | 2025 |
| Luodis Limited | Information & communication | 2025 |
| Luxe Luggage Limited | Wholesale & retail | 2025 |
| Luxxo Burgers Ltd | Hospitality | 2019 |
| Lvnh Holdings Ltd | Financial services | 2025 |
| Lvnh Wimborne Ltd | Construction | 2025 |
| LVT Post Ltd | Information & communication | 2026 |
| Lyme Court (Surbiton) Limited | Households | 1962 |
| Lyndhurst Gate Management Company Limited | Households | 2004 |
| Lynstone Building Services Ltd | Construction | 2019 |
| Lynwood Close Flat Management Company Limited | Households | 2001 |
| Lynwood Enterprises Limited | Wholesale & retail | 1985 |
| M & D Property Maintenance Ltd | Administrative & support | 2018 |
| M & M Properties Ltd | Real estate | 2015 |
| M J Bridges & Sons Ltd | Construction | 2011 |
| M N K Investments Limited | Real estate | 2018 |
| M O'Donnell Limited | Professional & scientific | 2012 |
| M S Kalsi (UK) Limited | Health & social care | 2006 |
| M&B Accountancy Services Limited | Professional & scientific | 2004 |
| M&E Roofing Group Ltd | Construction | 2025 |
| M&G Signature Homes Limited | Real estate | 2025 |
| M&L Trading Co. Ltd | Wholesale & retail | 2022 |
| M&Mautotraders Ltd | Wholesale & retail | 2023 |
| M&Mengservices Ltd | Construction | 2024 |
| M&R Roofing Specialists Ltd | Construction | 2013 |
| M&S Plumbing Services Ltd | Construction | 2024 |
| M.S.K. Consultancy Solutions Ltd | Information & communication | 2009 |
| M.T.A Construction Ltd | Construction | 2014 |
| M5 Consultancy Ltd | Professional & scientific | 2020 |
| MA & SS Ltd | Real estate | 2023 |
| MA Gasworks Ltd | Other services | 2021 |
| Maango Limited | Professional & scientific | 2017 |
| Maas Marketing Ltd | Professional & scientific | 2025 |
| Mackewn Commercial Solutions Ltd | Professional & scientific | 2025 |
| Macplus Limited | Information & communication | 2008 |
| Macro Kinetic Limited | Financial services | 2026 |
| Madhurs Ltd | Wholesale & retail | 2022 |
| Magenta Research Limited | Professional & scientific | 2016 |
| Magic Windows Ltd | Construction | 2025 |
| Magic Wood Floor Ltd | Construction | 2016 |
| Magnetar Digital Strategy Limited | Professional & scientific | 2021 |
| Magra Build Ltd | Construction | 2024 |
| Maguire Bros Limited | Construction | 2018 |
| Magvik Ltd | Construction | 2024 |