| London Dreamz Limited | Education | 2020 |
| London Endocrinology Ltd | Health & social care | 2025 |
| London Express Services Ltd | Transport & logistics | 2026 |
| London Gothic Limited | Information & communication | 2020 |
| London GTI Limited | Education | 2012 |
| London Metal & Recycling Ltd | Wholesale & retail | 2014 |
| London Property Concepts Limited | Households | 2001 |
| London Surrey Surveyors Ltd | Professional & scientific | 2008 |
| London Welfare Ltd. | Administrative & support | 2021 |
| London Wells Construction Limited | Extraterritorial | 2016 |
| London Wings Limited | Extraterritorial | 2012 |
| London Work at Height Seminar Limited | Other services | 2017 |
| Long Quinn International Ltd | Wholesale & retail | 2025 |
| Longchurn Consultants Limited | Professional & scientific | 2025 |
| Longton Building Services Limited | Construction | 2013 |
| Longview Close Management Company (Boughton) Ltd | Real estate | 2016 |
| Lonswood Properties Ltd | Hospitality | 2019 |
| Loom IP Limited | Information & communication | 2026 |
| Loop CR Ltd | Water & waste | 2015 |
| Loopswitch Ltd | Information & communication | 2025 |
| Lopezu Limited | Construction | 2020 |
| Lord Williams Ltd | Construction | 2014 |
| Lorien Interiors Ltd | Construction | 2009 |
| Loris Clements Ltd | Professional & scientific | 2016 |
| Lost Holdings Limited | Financial services | 2024 |
| Lost Property One Limited | Construction | 1975 |
| LOT RDC Ltd | Arts & recreation | 2006 |
| Lotus on Track Ltd | Arts & recreation | 2004 |
| Lound Solutions Ltd | Information & communication | 2025 |
| LOVE2BOUNCE Ltd | Arts & recreation | 2025 |
| Loved Once More Limited | Wholesale & retail | 2023 |
| Lovina Holdings Limited | Professional & scientific | 2015 |
| LOW Key Barrel Project Ltd | Wholesale & retail | 2020 |
| LOW Motors Ltd | Professional & scientific | 2023 |
| Lower Denmark Road Residents Management Company Limited | Households | 2019 |
| Lower Orchard Management Company Limited | Households | 2005 |
| Loxley Property Ltd | Real estate | 2019 |
| LP SD Seventy One Limited | Wholesale & retail | 2023 |
| LP Shipping Ltd | Transport & logistics | 2013 |
| LPB Oakleaf Holdings Limited | Real estate | 2023 |
| LPL Payroll Ltd | Professional & scientific | 2022 |
| LRW Transport Ltd | Transport & logistics | 2023 |
| LS Home Development Ltd | Real estate | 2025 |
| LS Investment Holdings Ltd | Real estate | 2025 |
| LSL Home Staging Limited | Administrative & support | 2014 |
| LSR Transport Ltd | Professional & scientific | 2020 |
| LSW Real Estate Ltd | Real estate | 2018 |
| Lt&Jj Limited | Wholesale & retail | 2026 |
| LTA Global Solutions Limited | Professional & scientific | 2023 |
| LTR Profiling Ltd | Manufacturing | 2020 |
| LTR Recovery Ltd | Wholesale & retail | 2021 |
| LTR Welding Services Ltd | Administrative & support | 2017 |
| LTS Construction Supplies Limited | Construction | 2023 |
| Luandy Farming Limited | Agriculture & fishing | 2018 |
| Luba Management Limited | Administrative & support | 2021 |
| Lucaspark (1994) Limited | Professional & scientific | 1993 |
| Luci Pollard Limited | Professional & scientific | 2006 |
| Luck's Pest Control Limited | Administrative & support | 2025 |
| Lucky Star (Ashford) Ltd | Wholesale & retail | 2024 |
| Lucus Live Ltd | Arts & recreation | 2018 |
| Lucyjames Recruitment Ltd | Administrative & support | 2025 |
| Ludpit Organic Cereals Farm Ltd | Agriculture & fishing | 2024 |
| LUE Consultancy Limited | Information & communication | 2026 |
| Lufnet Technologies Limited | Information & communication | 2015 |
| Lugana Consulting Ltd | Professional & scientific | 2025 |
| LUH Coffee Ltd | Hospitality | 2018 |
| Lukas Consulting Ltd | Construction | 2014 |
| Luke & Sons Ltd | Construction | 2026 |
| Luke Adam Bonner Electrical Services Ltd | Construction | 2026 |
| Luke's Good Wood Carpentry Ltd | Construction | 2022 |
| Lukehurst Enterprises Ltd | Construction | 2018 |
| Lullaby Properties Ltd | Real estate | 2019 |
| Lullah Sports Ltd | Education | 2016 |
| Luma Logistics Limited | Transport & logistics | 2015 |
| Luma Sports Limited | Manufacturing | 2022 |
| Luma-Id Ltd | Professional & scientific | 2012 |
| Lumeni Ltd | Education | 2025 |
| Lumina Clinical Services Ltd | Health & social care | 2025 |
| Lumina Dance Company Ltd | Administrative & support | 2024 |
| Lumina of London Ltd | Wholesale & retail | 2022 |
| Luminosity in Motion Ltd | Manufacturing | 2025 |
| Luminous Ecco Properties Ltd | Hospitality | 2025 |
| Lumis Consulting Limited | Public administration | 2018 |
| Lumley Marketing Solutions Limited | Professional & scientific | 2009 |
| Lumo Wholesale UK Limited | Wholesale & retail | 2025 |
| Luna Moon in Kent Limited | Manufacturing | 2020 |
| Lunar Graveyard Limited | Information & communication | 2013 |
| Lungeli Estate Ltd | Real estate | 2024 |
| Lunn Upstream Consultants Limited | Agriculture & fishing | 2002 |
| Lure De'Car Wash & Tyres Ltd | Other services | 2018 |
| Lush @ Lavershot Ltd | Construction | 2021 |
| Lush Concilium Ltd | Construction | 2025 |
| Lusso Equestrian Apparel Ltd | Wholesale & retail | 2021 |
| Lustre Digital Ltd | Professional & scientific | 2026 |
| Luton Chai Ltd | Hospitality | 2019 |
| Lutra Consulting Limited | Information & communication | 2015 |
| LUX Private Hire Ltd | Transport & logistics | 2024 |
| LUX Veritas Projects Ltd | Construction | 2026 |
| LUX Windows Ltd | Construction | 2026 |
| Luxelashparlour Limited | Other services | 2025 |