| Life Chiropractic Clinics Limited | Health & social care | 2006 |
| Life Property Services Limited | Real estate | 2015 |
| Lifeshurdle Holdings Limited | Financial services | 2026 |
| Lifeshurdle Limited | Health & social care | 2023 |
| Lifestyle BH Limited | Real estate | 2021 |
| Lifestyle Group (UK) Ltd | Wholesale & retail | 2015 |
| Light Corporation Architectural Ltd | Manufacturing | 2019 |
| LIKE2BIKE Limited | Administrative & support | 2012 |
| Lilley Property Ltd | Real estate | 2025 |
| Lillie’S Home Services Ltd | Administrative & support | 2025 |
| Lillywhite Property Builds Ltd | Construction | 2025 |
| Lillywhite Property Claims Ltd | Other services | 2023 |
| Lillywhite Property Estates Ltd | Real estate | 2023 |
| Lillywhite Property Maintenance Ltd | Construction | 2020 |
| Limetree Carpentry & Joinery Ltd | Construction | 2014 |
| Linear Interiors Limited | Construction | 2014 |
| Link Management Limited | Administrative & support | 2018 |
| Lion Building New Homes Limited | Construction | 2003 |
| Lioness Digital Marketing Ltd | Information & communication | 2020 |
| Liquid Luxury Ltd | Wholesale & retail | 2024 |
| List Link Ltd | Professional & scientific | 2024 |
| Lister & Co Project Consultants Limited | Professional & scientific | 2014 |
| Little Black Dog Limited | Professional & scientific | 2014 |
| Little Box of Horror Ltd | Wholesale & retail | 2026 |
| Littlebury Court Residents Association Limited | Households | 1986 |
| LJG Heating Services Ltd | Construction | 2025 |
| LJJ Associates Limited | Financial services | 2001 |
| LJM Project Services Ltd | Construction | 2014 |
| LLB Solutions Essex Ltd | Manufacturing | 2026 |
| LLJ Fire Limited | Public administration | 2025 |
| LMV Enterprises Limited | Wholesale & retail | 2016 |
| LMV Property Limited | Real estate | 2021 |
| Loaded With Menace Limited | Wholesale & retail | 2022 |
| Local Buzz Marketing Limited | Professional & scientific | 2014 |
| Local Central Heating Ltd | Construction | 2016 |
| Local Hero London Limited | Hospitality | 2020 |
| Local Trade Group Ltd | Professional & scientific | 2026 |
| Loft Makers London Ltd | Construction | 2017 |
| London Black CAB Transfers Ltd | Transport & logistics | 2020 |
| London Drilling School Ltd | Education | 2015 |
| London Green (Charlton) Ltd | Construction | 2013 |
| London Hill Medical Ltd | Health & social care | 2019 |
| London Market Finance Ltd | Professional & scientific | 2019 |
| London School of Clinical Communications and Hypnosis Ltd | Education | 2017 |
| Loram Homes Ltd | Construction | 2016 |
| Loud Mouth Marketing Limited | Information & communication | 2026 |
| Louis Pollock Enterprises Ltd | Professional & scientific | 2022 |
| Love Bees Ltd | Manufacturing | 2018 |
| Lowe Infrastructure Consulting Limited | Professional & scientific | 2025 |
| LP Energy Associates Limited | Professional & scientific | 2022 |
| LP Testing & Compliance Limited | Professional & scientific | 2026 |
| LPS Enterprises Limited | Professional & scientific | 2025 |
| LRD Atlas Ltd | Real estate | 2019 |
| LTF Services Limited | Construction | 2009 |
| Lucy White Permanent Make UP Ltd | Other services | 2022 |
| Lucy White Permanent Make UP Training Ltd | Education | 2023 |
| Luna Project Management Ltd | Construction | 2017 |
| Luso Limited | Financial services | 2019 |
| Lutener Road Ltd | Real estate | 2022 |
| Luxe Construction Limited | Construction | 2013 |
| LUXE31EVENTS Limited | Hospitality | 2026 |
| LW Digital Influence Limited | Administrative & support | 2017 |
| LWH Autos Limited | Wholesale & retail | 2025 |
| LWH Electrical Ltd | Construction | 2016 |
| Lychgate Farm Cafe Limited | Hospitality | 2023 |
| Lynchpin Media Ltd | Information & communication | 2012 |
| Lyndbourne Court Management Company Limited | Households | 1990 |
| Lyndbourne Court RTM Company Limited | Households | 2013 |
| Lynwood Lettings Ltd | Real estate | 2019 |
| Lyons Carpentry Contractors (Essex) Ltd | Construction | 2025 |
| M & H Consulting Services Ltd | Professional & scientific | 2016 |
| M & M Roofing & Building Limited | Construction | 2006 |
| M & M Selley Ltd | Construction | 2023 |
| M a Pipelay Ltd | Construction | 2025 |
| M Agyakwa Recruitment Ltd | Administrative & support | 2025 |
| M&M Holdings East London Limited | Financial services | 2015 |
| M&R Demolition Specialists Limited | Construction | 2012 |
| M.& M.Demolition Co.Limited | Construction | 1965 |
| M.A.Pipelay & Maintenance Limited | Construction | 2011 |
| M1 Plates Limited | Extraterritorial | 2024 |
| M3 Contracting (GB) Ltd | Construction | 2017 |
| M3 Plant Hire Ltd | Administrative & support | 2018 |
| MAC Field Services Ltd | Construction | 2014 |
| Macleod Atelier Ltd | Professional & scientific | 2026 |
| Mahib Limited | Information & communication | 2019 |
| MAID2CLEAN South Coast Ltd | Administrative & support | 2017 |
| Major Incident Planning Limited | Professional & scientific | 2016 |
| Makeupbyshannonh Limited | Other services | 2025 |
| Mambo Direct Limited | Manufacturing | 2013 |
| Mangofrog Ltd | Wholesale & retail | 2020 |
| Manifesting Baby Ltd | Other services | 2024 |
| Manumission Ltd | Professional & scientific | 2001 |
| Maplefords Flooring Ltd | Wholesale & retail | 2021 |
| Maps Trading Limited | Wholesale & retail | 2008 |
| Maps Wealth Management Limited | Financial services | 2005 |
| Maps Wills & Trusts Limited | Financial services | 2007 |
| Marbelous Group Ltd | Financial services | 2024 |
| Marbelous Quartz Ltd | Manufacturing | 2024 |
| Marchant IT Services Limited | Professional & scientific | 2024 |
| Marchetti Stone & Ceramics Limited | Manufacturing | 2025 |