| LMM Properties Limited | Extraterritorial | 2015 |
| LMM Technical Services Ltd | Information & communication | 2014 |
| Lmscr Services Ltd | Wholesale & retail | 2023 |
| LMY Incorporated Ltd | Hospitality | 2023 |
| LNS Development Group Limited | Real estate | 2026 |
| Local Media Marketing Ltd | Professional & scientific | 2011 |
| Lockharted Ltd | Information & communication | 2025 |
| Locks of Love by Annie Ltd | Other services | 2025 |
| Lodafriq Ltd | Health & social care | 2024 |
| LOGIC7 Foods Limited | Wholesale & retail | 2023 |
| LOGIC7 IT Limited | Information & communication | 2023 |
| Logicraft Limited | Transport & logistics | 2002 |
| Logiik Limited | Information & communication | 2016 |
| Logitrade Ltd | Transport & logistics | 2019 |
| Logo Motors Ltd | Wholesale & retail | 2018 |
| Loisirs a L'Ecole Ltd | Health & social care | 2020 |
| Lola Ventures Limited | Information & communication | 2025 |
| LOM Driving Limited | Transport & logistics | 2013 |
| Lonaire Ltd | Administrative & support | 2017 |
| London Ambulance Ltd | Transport & logistics | 2024 |
| London Auto Electrics Ltd | Wholesale & retail | 2020 |
| London Beacon Property Management Ltd | Construction | 2023 |
| London Borough Cricket CUP Limited | Arts & recreation | 2025 |
| London Building Compliance Ltd | Construction | 2025 |
| London Capital Holdings Limited | Financial services | 2024 |
| London Centre for Professional Excellence Ltd | Information & communication | 2021 |
| London City Cakes Limited | Hospitality | 2014 |
| London City Property Maintenance Limited | Construction | 2025 |
| London Coaching Experience Limited | Administrative & support | 2022 |
| London Law Consultants Ltd | Other services | 2016 |
| London Properties Management Services Ltd | Real estate | 2021 |
| London Roofing Contractors Ltd | Construction | 2022 |
| London Skills Training Academy Ltd | Education | 2025 |
| London Skin Consultancy Ltd | Health & social care | 2015 |
| London TCM Limited | Arts & recreation | 2018 |
| London Virgin Hair Limited | Other services | 2016 |
| London Virgin Hair Salon Limited | Other services | 2018 |
| LONDONRD27 Ltd | Hospitality | 2026 |
| Lone Wolf Sales Limited | Wholesale & retail | 2013 |
| Long Green Maintenance Limited | Households | 1970 |
| Longwood Confectionery Limited | Wholesale & retail | 2017 |
| Looking Slick Ltd | Manufacturing | 2019 |
| Lordgrace Delight Healthcare Limited | Health & social care | 2017 |
| Lore Services Ltd | Other services | 2025 |
| Lorettcare Ltd | Health & social care | 2023 |
| Lou's Warranty Ltd | Wholesale & retail | 2023 |
| Lourdhu Matha Consulting Ltd | Financial services | 2012 |
| Louwells Property Ltd | Real estate | 2024 |
| Love Communications Limited | Professional & scientific | 2009 |
| Lovebike Ltd | Information & communication | 2015 |
| Lovemydo Ltd | Other services | 2021 |
| Loveshoreditch Limited | Arts & recreation | 2016 |
| LPS Electrics Ltd | Administrative & support | 2015 |
| LRJ Plastering Ltd | Construction | 2014 |
| LRM Maintenance Ltd | Households | 2025 |
| LRR Ventures Ltd | Administrative & support | 2020 |
| LRS Autos Ltd | Wholesale & retail | 2023 |
| LRS Heath Properties Ltd | Real estate | 2023 |
| LRS Refrigeration Ltd | Professional & scientific | 2025 |
| Lrwf Holdings Ltd | Wholesale & retail | 2025 |
| LS Ductwork Group Ltd | Construction | 2023 |
| LS Ductwork Ltd | Construction | 2017 |
| LS Mann Ltd | Real estate | 2025 |
| Lskj Group Ltd | Professional & scientific | 2026 |
| Lskj Project Management Ltd | Construction | 2023 |
| LSL Cloud Limited | Information & communication | 2018 |
| LSM Accounting Ltd | Professional & scientific | 2024 |
| Lssa Holdings Limited | Financial services | 2025 |
| LTS Building & Landscaping Limited | Construction | 2022 |
| LTS UK Services Ltd | Construction | 2015 |
| Lubenah Ltd | Information & communication | 2025 |
| Lubo 58 Ltd | Construction | 2014 |
| Luca & Cory Ltd | Construction | 2018 |
| Luca MD Ltd | Transport & logistics | 2019 |
| Lucoi Ltd | Construction | 2025 |
| Lufem Engineering Services Limited | Professional & scientific | 2019 |
| Luisandrei Limited | Information & communication | 2024 |
| Luke Edwards Limited | Construction | 2025 |
| Luksar Ltd | Transport & logistics | 2026 |
| Lully Digital Ltd | Professional & scientific | 2019 |
| Lulu’S Beauty Ltd | Other services | 2023 |
| Lumbers Stocktaking Ltd | Professional & scientific | 2014 |
| Lumi Care Services Ltd | Health & social care | 2021 |
| Lumia Group Ltd | Information & communication | 2025 |
| Lumia Trading Ltd | Financial services | 2025 |
| Lummycool UK Properties Limited | Real estate | 2025 |
| Lumo Gabs Integrated Services Limited | Health & social care | 2017 |
| Lumos Health Limited | Health & social care | 2015 |
| Luna Cleaning Solutions Limited | Administrative & support | 2017 |
| Luna Martial Arts Ltd | Arts & recreation | 2023 |
| Lush Bird Ltd | Wholesale & retail | 2015 |
| Luvbub Ltd | Wholesale & retail | 2022 |
| Luxa Property Group Ltd | Real estate | 2026 |
| Luxdriven Limited | Transport & logistics | 2025 |
| Luxe Aura Store Ltd | Wholesale & retail | 2025 |
| Luxride Car Seat Covers UK Ltd | Wholesale & retail | 2026 |
| Luxtouch Services Limited | Administrative & support | 2024 |
| Luxury Sparks Ltd | Construction | 2019 |
| LV Carpentry Limited | Construction | 2019 |
| LVS Carpentry & Joinery Ltd | Construction | 2019 |