| Ls-Painters Ltd | Construction | 2017 |
| LSA Decorating Ltd | Construction | 2023 |
| LSC Cricklewood Ltd | Education | 2023 |
| LSC Leytonstone Ltd | Education | 2019 |
| LSC ME Ltd | Education | 2024 |
| LSC Stanmore Ltd | Education | 2019 |
| LSC Willesden Ltd | Education | 2023 |
| LSG Groundworks Ltd | Construction | 2021 |
| LTS Decorating Services Ltd | Other services | 2010 |
| LU2 Limited | Real estate | 2024 |
| Luca Perfect Services Ltd | Construction | 2018 |
| Luci LUX Ltd | Construction | 2020 |
| Lucid Dreams Cooperation Limited | Information & communication | 2024 |
| Lucid Dreams Pictures Limited | Information & communication | 2024 |
| Luckstar Enterprises Limited | Information & communication | 2011 |
| Lucky Dhillon Photography Limited | Professional & scientific | 2013 |
| Lucky Enterprise Limited | Wholesale & retail | 2025 |
| Lucky Mobile Tyre Ltd | Wholesale & retail | 2024 |
| Ludian Harapaj Projects Limited | Construction | 2022 |
| Ludorum Enterprises Limited | Information & communication | 2006 |
| Luga Global Ltd | Wholesale & retail | 2023 |
| Luggage Stall Ltd | Wholesale & retail | 2020 |
| Lukas Dryliner Ltd | Administrative & support | 2017 |
| Luma Productions Ltd | Information & communication | 2014 |
| Lumevia Systems Limited | Professional & scientific | 2025 |
| Lumicopharma Limited | Wholesale & retail | 2025 |
| Lumiere Tanning Ltd | Other services | 2024 |
| Lumiere X Art London Limited | Manufacturing | 2025 |
| Luminar Partners Ltd | Administrative & support | 2022 |
| Luminar Veritas Ltd. | Other services | 1998 |
| Luminium Limited | Education | 2003 |
| Luminous Property Group Ltd | Real estate | 2017 |
| Luminous RE Ltd | Real estate | 2017 |
| Lumsleigh Ltd | Extraterritorial | 2013 |
| Lumybel Eco Homes Ltd | Construction | 2022 |
| Lumybel Projects Limited | Professional & scientific | 2021 |
| Lumybel Retro Fit Ltd | Construction | 2022 |
| Luna & Co London Limited | Real estate | 2025 |
| Luna Horizon Limited | Administrative & support | 2025 |
| Lunara Health Limited | Health & social care | 2025 |
| Luner Limited | Hospitality | 2015 |
| Lungo Construction Limited | Construction | 2022 |
| Luross Ltd | Extraterritorial | 2010 |
| Lusera Construction Ltd | Construction | 2025 |
| Lustre of London Limited | Wholesale & retail | 2016 |
| Luton Advanced Dental Care Ltd | Health & social care | 2022 |
| Luvsh Holding Limited | Financial services | 2026 |
| LUX Property Solutions Ltd | Real estate | 2021 |
| LUX Vitae Limited | Professional & scientific | 2025 |
| Luxe Carpet and Flooring Ltd | Construction | 2025 |
| Luxe Essence Group Ltd | Wholesale & retail | 2024 |
| Luxe Lift Limited | Transport & logistics | 2025 |
| Luxe Pack Limited | Administrative & support | 2021 |
| Luxedrivecars Limited | Transport & logistics | 2023 |
| Luxentia Stays Ltd | Real estate | 2026 |
| Luxium Refresh Ltd | Wholesale & retail | 2024 |
| Luxury Home LET Ltd | Real estate | 2023 |
| Luxury Minibus London Ltd | Transport & logistics | 2021 |
| Luxury Villas Limited | Real estate | 2022 |
| Luxus Bar Holding Ltd | Financial services | 2023 |
| Luxwelle Ltd | Manufacturing | 2020 |
| Luxx LIT Ltd | Other services | 2024 |
| LW Services London Ltd | Water & waste | 2023 |
| LXW JI Chicken Ltd | Hospitality | 2023 |
| LY CAM Ltd | Wholesale & retail | 2024 |
| Lydtex Limited | Wholesale & retail | 2014 |
| LYK Investments Ltd | Real estate | 2022 |
| LYK Property Management Ltd | Real estate | 2022 |
| Lynestar Ltd | Transport & logistics | 2025 |
| M & a Gems and Jewellery Ltd | Wholesale & retail | 2020 |
| M & a Photography Ltd | Professional & scientific | 2024 |
| M & B London Limited | Real estate | 2011 |
| M & C Accounting Limited | Professional & scientific | 2012 |
| M & C Events Limited | Administrative & support | 2006 |
| M & D International Food Ltd | Wholesale & retail | 2017 |
| M & E Capital Ltd | Professional & scientific | 2026 |
| M & J Holdings (Edgware) Limited | Financial services | 2020 |
| M & J Properties (Edgware) Limited | Real estate | 2020 |
| M & M Double Glazing Ltd | Construction | 2011 |
| M & N Catering (Kent) Limited | Hospitality | 2012 |
| M & R Deal Advisory Limited | Professional & scientific | 2020 |
| M & T Linedance Events Limited | Other services | 2024 |
| M B Logistik Ltd | Transport & logistics | 2016 |
| M Bazgan & BRO Ltd | Construction | 2016 |
| M Boys Properties Ltd | Real estate | 2025 |
| M C Management Limited | Administrative & support | 2022 |
| M Elegance Ltd | Wholesale & retail | 2025 |
| M F Properties London Limited | Real estate | 2018 |
| M Feraru Services Ltd | Construction | 2019 |
| M for Menopause Limited | Health & social care | 2017 |
| M Gavrilas Construction Ltd | Construction | 2015 |
| M K Parker Limited | Construction | 2024 |
| M Law Consultancy Limited | Professional & scientific | 2020 |
| M Sidiq & Sons Limited | Wholesale & retail | 2023 |
| M&A Brickwork Ltd | Construction | 2022 |
| M&A Food Centre Ltd | Wholesale & retail | 2025 |
| M&A Investments Ltd | Real estate | 2023 |
| M&B Care Group Limited | Health & social care | 2018 |
| M&B Rail Limited | Construction | 2017 |
| M&C Build Limited | Construction | 2024 |