| London Bargain Mart Limited | Wholesale & retail | 2024 |
| London Bespoke Joinery Limited | Construction | 2024 |
| London Bridge Consultancy Ltd | Professional & scientific | 2024 |
| London City CAB Ltd | Transport & logistics | 2024 |
| London City Trading Limited | Other services | 2023 |
| London College of Law and Business Ltd | Education | 2025 |
| London Development and Refurbishment Limited | Construction | 2019 |
| London Energy Assessors Ltd. | Other services | 2020 |
| London Experienced Cleaners Limited | Administrative & support | 2024 |
| London Express Removals Ltd | Transport & logistics | 2018 |
| London Land Development Limited | Construction | 2024 |
| London Luxury Events Ltd. | Other services | 2014 |
| London Maison Limited | Real estate | 2010 |
| London Mineral Resources Ltd | Mining & quarrying | 2023 |
| London Party & Decoration Ltd | Information & communication | 2026 |
| London Plastics Ltd | Wholesale & retail | 2018 |
| London Properties Management Ltd | Real estate | 2022 |
| London SB Properties Ltd | Real estate | 2026 |
| London Shaker Doors and Panels Ltd | Construction | 2025 |
| London Smart Build Ltd | Construction | 2015 |
| Londoners Garden SW14 Ltd | Administrative & support | 2023 |
| Londoners Garden SW6 Ltd | Administrative & support | 2023 |
| Londonroadnews Limited | Hospitality | 2017 |
| Longcare Ltd | Wholesale & retail | 2016 |
| Loodoo Ltd | Wholesale & retail | 2025 |
| Loopley Ltd | Wholesale & retail | 2025 |
| Lopex Ltd | Real estate | 2003 |
| Lopez C & C Ltd | Real estate | 2023 |
| Lorbax Property Solutions Ltd | Real estate | 2025 |
| Loredana Home Care Limited | Administrative & support | 2022 |
| Lornette and Rose Enterprise Ltd | Health & social care | 2021 |
| Lotus Bridge Capital Limited | Financial services | 2024 |
| Lotus Venture Capital Ltd | Real estate | 2024 |
| Louis Logistics and Removal Ltd | Transport & logistics | 2021 |
| Loutse Ltd | Health & social care | 2022 |
| Love Care Group Limited | Health & social care | 2024 |
| LOW Price Food & Wine Limited | Wholesale & retail | 2004 |
| LP Forge Ltd | Professional & scientific | 2026 |
| LR Plastering Ltd | Construction | 2024 |
| LS London Contractors Limited | Construction | 2021 |
| LSJ Professionals Ltd | Administrative & support | 2019 |
| LSV Properties Limited | Real estate | 2024 |
| LTP Market Limited | Hospitality | 2023 |
| LTT Books Limited | Professional & scientific | 2016 |
| LTV Events Ltd | Hospitality | 2026 |
| Lubov Limited | Other services | 2016 |
| Lucas Flooring & Carpentry Ltd | Construction | 2022 |
| Lucid Global Trading Limited | Wholesale & retail | 2025 |
| Lucky Services 38 Limited | Transport & logistics | 2017 |
| Lucky Chance Limited | Professional & scientific | 2022 |
| Lucky Express (Luton) Limited | Wholesale & retail | 2015 |
| Lucky Jaguar Studios Ltd | Information & communication | 2026 |
| Lucy's Cleaning Ltd | Administrative & support | 2026 |
| Luigit Ltd | Administrative & support | 2022 |
| LUK & MAR Construction Ltd | Construction | 2018 |
| Luli Concept Ltd | Health & social care | 2025 |
| Luminary Intelligence Ltd | Information & communication | 2026 |
| Lung-Line Ltd | Education | 2020 |
| Lush Design & Construction Ltd | Construction | 2019 |
| Lush LDN Limited | Other services | 2023 |
| Lush London Limited | Other services | 2023 |
| Luso Sports Ltd | Administrative & support | 2019 |
| Luxelimo Limited | Transport & logistics | 2021 |
| Luxfeel Ltd | Wholesale & retail | 2025 |
| Luzmon UK Limited | Arts & recreation | 2004 |
| LWP Holdings Ltd | Other services | 2026 |
| LWS Group Limited | Financial services | 2022 |
| Lyndon Energy Limited | Energy | 2011 |
| Lyndon Water Limited | Water & waste | 2016 |
| M & J Autos Limited | Wholesale & retail | 2013 |
| M & P O'Donnell Ltd | Construction | 2014 |
| M a D Lifts Ltd | Construction | 2018 |
| M a Rehman Ltd | Transport & logistics | 2022 |
| M Alexander Property Services Limited | Real estate | 2026 |
| M Asllani Constructions Ltd | Construction | 2023 |
| M F General Building & Decorating Limited | Construction | 2008 |
| M F Painting and Decorating Ltd | Construction | 2015 |
| M G Fitter Welder Limited | Construction | 2018 |
| M Hilasque Ltd | Health & social care | 2024 |
| M M I Security Ltd | Administrative & support | 2023 |
| M S H Training & Consultancy Limited | Professional & scientific | 2009 |
| M S Urban Services Ltd | Construction | 2025 |
| M Zain Asif Ltd | Wholesale & retail | 2025 |
| M&J Beauty Salon Ltd | Other services | 2025 |
| M&M Builders London Ltd | Construction | 2023 |
| M&S Motorz Ltd | Wholesale & retail | 2019 |
| M&T 7511 Ltd | Transport & logistics | 2022 |
| M.Debrah Limited | Professional & scientific | 2017 |
| M.F.H.J Ltd | Construction | 2025 |
| M.H Boss Limited | Construction | 2024 |
| M.V Car Services Ltd | Wholesale & retail | 2024 |
| M3 Housing Limited | Wholesale & retail | 2003 |
| M3M Properties Limited | Real estate | 2025 |
| M4U Building & Design Ltd | Construction | 2023 |
| MA Electrical Expert Ltd | Construction | 2021 |
| Mabanja & Sons Ltd | Health & social care | 2017 |
| Mabiza Dune Limited | Manufacturing | 2026 |
| Machinery Group Limited | Wholesale & retail | 2019 |
| Macky UG Limited | Wholesale & retail | 2022 |
| MAD Building Ltd | Construction | 2026 |