| London City Philharmonic Limited | Education | 2016 |
| London Deluxe Apartments Ltd | Real estate | 2018 |
| London Host Families Ltd | Hospitality | 2012 |
| London K&O Constrution Ltd | Construction | 2024 |
| London Metallics Ltd | Administrative & support | 2019 |
| London Moorings Ltd | Real estate | 2017 |
| London Music Society | Education | 2017 |
| London Removal Specialist Limited | Transport & logistics | 2020 |
| London Rubbish Ltd | Administrative & support | 2011 |
| London Seamless Flat Roofing Ltd. | Construction | 2005 |
| London Street Band Ltd | Arts & recreation | 2017 |
| London Suzuki Group(The) | Education | 1985 |
| London Tavern Trails Limited | Administrative & support | 2011 |
| London Transporter Ltd | Transport & logistics | 2018 |
| London VEG & Fruits Delivery Ltd | Wholesale & retail | 2014 |
| Londres Turismo Ltd | Transport & logistics | 2014 |
| Long Mews Residents Association Limited | Households | 1987 |
| Longevi Ltd | Information & communication | 2026 |
| Lords Agricultural Machineries Limited | Wholesale & retail | 2016 |
| Lords of Motion Limited | Information & communication | 2023 |
| Lorion Homes Limited | Real estate | 2024 |
| Lost&Found Archives Ltd | Professional & scientific | 2012 |
| Louise Holland Enterprises Limited | Professional & scientific | 2013 |
| Loutfi Consulting Limited | Professional & scientific | 2017 |
| Lovegrove Future Projects Ltd | Professional & scientific | 2023 |
| Lovely Kitchen Ltd | Hospitality | 2023 |
| LP Business & Management Ltd | Wholesale & retail | 2019 |
| LRN3 Ltd | Information & communication | 2025 |
| LS Best Ltd | Construction | 2018 |
| LSC Security Services Ltd | Administrative & support | 2021 |
| LSP Consulting & Management Ltd | Wholesale & retail | 2023 |
| LSY Engineering Consultants Ltd | Construction | 2016 |
| Luci.Lex Ltd | Professional & scientific | 2025 |
| Lucianne Limited | Information & communication | 2016 |
| Lumminary Ltd | Information & communication | 2017 |
| Lumvios Limited | Education | 2022 |
| LUX Automotive Ltd | Wholesale & retail | 2011 |
| LUX Plumbing Ltd | Construction | 2024 |
| Luxe Cucine by Aster Ltd | Wholesale & retail | 2025 |
| Luxe Decor by Giorgio Graesan Ltd | Wholesale & retail | 2024 |
| Luxe Decor Lighting Ltd | Wholesale & retail | 2025 |
| Luxe Taskmasters Ltd | Professional & scientific | 2025 |
| Luxion Jane Limited | Wholesale & retail | 2025 |
| Luxprimestay Ltd | Hospitality | 2025 |
| Luxury Things Ltd | Extraterritorial | 2024 |
| Lyndor Properties Ltd | Real estate | 2026 |
| Löyly Bathhouse Ltd | Other services | 2025 |
| M Digital Services Ltd | Information & communication | 2024 |
| M Goldhands Construction Ltd | Construction | 2018 |
| M Maria Limited | Professional & scientific | 2014 |
| M P Brentford Limited | Wholesale & retail | 2012 |
| M S Agile Ltd | Information & communication | 2019 |
| M&M Realstates Ltd | Real estate | 2024 |
| M&T Construction Limited | Construction | 2021 |
| M&Y Building Solutions Ltd | Construction | 2023 |
| M.G SS Limited | Construction | 2024 |
| M1 Moto Ltd | Wholesale & retail | 2019 |
| Maani Construction Ltd | Construction | 2025 |
| MAD & Soph Limited | Health & social care | 2020 |
| Mafekin Avenue Limited | Households | 2018 |
| MAG Worldwide Audit Tax Legal Ltd | Wholesale & retail | 2022 |
| Magic Holdings Limited | Hospitality | 2020 |
| Magic Overseas Limited | Administrative & support | 2025 |
| Magicomm Limited | Information & communication | 2003 |
| Magnum Windows Limited | Construction | 2012 |
| Maguie Ltd | Wholesale & retail | 2015 |
| Maidenhair Tree Design & Renovation Ltd | Construction | 2025 |
| Main Publishing Group Ltd | Wholesale & retail | 2023 |
| Maio Studio Limited | Other services | 2017 |
| Majestic Accountants Limited | Professional & scientific | 2012 |
| Majgo UK LLP | | 2015 |
| Make a Difference ( SRI Lanka ) Ltd | Health & social care | 2011 |
| Makeitnew Ltd | Information & communication | 2020 |
| Mallorca Project Ltd | Wholesale & retail | 2025 |
| Mameli Ltd | Professional & scientific | 2025 |
| MAN Industry Ltd | Wholesale & retail | 2023 |
| MAN Resources Ltd | Information & communication | 2016 |
| Managementhome Limited | Households | 2026 |
| Mann Estates Limited | Real estate | 2021 |
| Manraj Construction Ltd | Construction | 2024 |
| Maple Applications Limited | Information & communication | 2018 |
| Maple&Moon Ltd | Manufacturing | 2025 |
| Maremma Houses Ltd | Construction | 2013 |
| Marg Education International Limited | Education | 2023 |
| Marianna Financial Services Limited | Financial services | 2020 |
| Marida Coffee Ltd | Wholesale & retail | 2024 |
| Mariri Jewels Ltd | Wholesale & retail | 2024 |
| Mark Deda Decoration Ltd | Construction | 2025 |
| Market Cloud Ltd | Information & communication | 2019 |
| Marketplug Limited | Information & communication | 2020 |
| Marko Luxury Chauffeurs Limited | Transport & logistics | 2026 |
| Marmary Ltd | Wholesale & retail | 2024 |
| Martin Kiaran Smith Limited | Professional & scientific | 2005 |
| Martindale Advisory Limited | Professional & scientific | 2026 |
| Marvel Tech Business Consulting Ltd | Information & communication | 2019 |
| Marvella Limited | Construction | 2025 |
| Marwood Motor Finance Limited | Wholesale & retail | 2011 |
| Mary Taylor Developments Ltd | Administrative & support | 2022 |
| Mary Taylor Ltd | Financial services | 2020 |
| Maryam's Kitchen Limited | Hospitality | 2018 |