| London Nest Investments Ltd | Financial services | 2019 |
| London Orthopaedic Associates Limited | Health & social care | 2025 |
| London Phoenix Security Ltd | Administrative & support | 2021 |
| London Reconstruction Ltd | Education | 2019 |
| London Road Living Ltd | Construction | 2020 |
| London Stem Innovation and Investments Ltd | Information & communication | 2020 |
| London Transport Solutions Limited | Transport & logistics | 2020 |
| London Van Hire Limited | Administrative & support | 2024 |
| London Wildflower Ltd | Arts & recreation | 2017 |
| Londoncarriages&Couriers Ltd | Administrative & support | 2014 |
| Long Wings Food Trading Ltd | Wholesale & retail | 2024 |
| Longmore Convenience Store Limited | Wholesale & retail | 2006 |
| Longtrips Ltd | Transport & logistics | 2026 |
| Lordchem Ltd | Wholesale & retail | 2018 |
| Lossassist International Limited | Professional & scientific | 2007 |
| Lotus Care (Aaron Lodge) Limited | Health & social care | 2017 |
| Lotus Care (Bridge House) Ltd | Health & social care | 2018 |
| Lotus Care (Cressington Court) Limited | Health & social care | 2017 |
| Lotus Care (Dunollie) Limited | Health & social care | 2019 |
| Lotus Care (Finch Manor) Ltd | Health & social care | 2018 |
| Lotus Care (Glenarie Manor) Ltd | Health & social care | 2016 |
| Lotus Care Bennett House Ltd | Health & social care | 2023 |
| Lotus Care Finch Manor (Holdings) Ltd | Health & social care | 2025 |
| Lotus Care Holdings Limited | Health & social care | 2021 |
| Lotus One Developments Limited | Real estate | 2026 |
| Lotus One Holdings Limited | Other services | 2026 |
| Louise Ioannou Ltd | Administrative & support | 2017 |
| Louise's Kitchen Garden Limited | Wholesale & retail | 2025 |
| Love Farm Medicines Limited | Financial services | 2023 |
| Love Lane Tandoori Ltd | Hospitality | 2024 |
| Love Your Run Limited | Arts & recreation | 2025 |
| Lovethelinks Limited | Wholesale & retail | 2010 |
| Lovett Construction Services Limited | Other services | 2019 |
| Loxdon Properties Limited | Real estate | 2025 |
| Lozi Investments Limited | Health & social care | 2014 |
| LPT (Glastonbury) Ltd | Real estate | 2014 |
| LPT (London) Ltd | Real estate | 2025 |
| LPV Global Ltd | Information & communication | 2024 |
| LR Bookkeeping Ltd | Professional & scientific | 2021 |
| Lrmm Properties Limited | Real estate | 2024 |
| LRS Digital Solutions Ltd | Information & communication | 2022 |
| LSP Enterprises Ltd. | Health & social care | 2011 |
| LSR Care Limited | Administrative & support | 2021 |
| Lucaciu Construction Limited | Construction | 2018 |
| Luciana Berry Limited | Hospitality | 2019 |
| Luckoni Trading & Investments Ltd | Real estate | 2006 |
| Luckydale Limited | Real estate | 1986 |
| Lullaby Music and Post Ltd | Information & communication | 2002 |
| Lulu Barton Photography Limited | Professional & scientific | 2025 |
| Lumen Content Ltd | Information & communication | 2023 |
| Lumitiq Ltd | Construction | 2014 |
| Luton Landmark Properties Ltd | Real estate | 2021 |
| Luton Metal Recycling Holdings Limited | Financial services | 2026 |
| Lutra London Limited | Professional & scientific | 2007 |
| LUX Education Group Ltd | Education | 2024 |
| LUX Renovate Limited | Real estate | 2024 |
| Luxe Experiences & Travel Services Ltd | Administrative & support | 2024 |
| Luxe Foods and Hospitality Limited | Hospitality | 2018 |
| Luxe Hospitality (Liverpool) Limited | Hospitality | 2024 |
| Luxova Ltd | Other services | 2025 |
| Luxury Hospitality Ltd | Hospitality | 2016 |
| Luxury Rentals (UK) Limited | Hospitality | 2003 |
| Luxury Sole Ltd | Wholesale & retail | 2019 |
| Luxury Wood Flooring Ltd | Wholesale & retail | 2011 |
| LWO Heating Services Ltd | Construction | 2020 |
| LWS Technologies Ltd | Information & communication | 2023 |
| LX Interior Works Limited | Construction | 2019 |
| Lyfe FS Ltd | Financial services | 2020 |
| Lygon Stores Limited | Health & social care | 1998 |
| Lyme Bay Building & Heating Ltd | Construction | 2020 |
| Lyme Bay Building Co Ltd | Construction | 2012 |
| Lyte Camera Limited | Information & communication | 2014 |
| M & a Hatch END Limited | Administrative & support | 2023 |
| M & H Property Management Limited | Real estate | 2015 |
| M Dann Creative Limited | Arts & recreation | 2017 |
| M Four 2 SIX Limited | Wholesale & retail | 2025 |
| M G Corporate Finance Ltd | Professional & scientific | 2002 |
| M K Pinner Property Ltd | Real estate | 2023 |
| M K Technets Ltd | Wholesale & retail | 2010 |
| M K Wealth and Management Ltd | Real estate | 2020 |
| M PS Food and Wine Limited | Wholesale & retail | 2013 |
| M Z DIN Ltd | Hospitality | 2025 |
| M&Ak Consulting Limited | Professional & scientific | 2014 |
| M&C Catering and Events Limited | Wholesale & retail | 2024 |
| M&J's Coffee and More Limited | Hospitality | 2022 |
| M&K Right Choice Ltd | Transport & logistics | 2014 |
| M&L Asset Management Ltd | Financial services | 2025 |
| M&L Group Ltd | Real estate | 2011 |
| M&M Railway Services Ltd | Construction | 2016 |
| M&Mpharm Ltd | Health & social care | 2011 |
| M&N Enterprises Limited | Real estate | 2015 |
| M&S Mechanical Engineering Limited | Construction | 2015 |
| M&S Mechanical Services Ltd | Construction | 2022 |
| M&S Retail Services Limited | Wholesale & retail | 2014 |
| M&S Techno Ltd | Extraterritorial | 2018 |
| M. Youde Consultancy Limited | Administrative & support | 2010 |
| M.E. Rumble & Sons Limited | Real estate | 1938 |
| M.R. GB Investments Limited | Real estate | 2019 |
| M/S Batra Bros. Food and Beverages Limited | Hospitality | 2019 |
| M2M London Blinds Limited | Manufacturing | 2017 |