| Layters HOY Consulting Limited | Professional & scientific | 2009 |
| Lbtt Ltd | Hospitality | 2025 |
| LDC Scenery Limited | Information & communication | 2025 |
| Leachcroft Ltd | Information & communication | 2010 |
| Lead 2 Succeed Training Ltd | Professional & scientific | 2022 |
| Leap Ahead Limited | Professional & scientific | 2004 |
| Learning to Work (South East) Limited | Education | 1994 |
| Ledgerlytics Ltd | Professional & scientific | 2023 |
| Legal Surveying Services Limited | Construction | 2022 |
| Legion Motors Ltd | Wholesale & retail | 2022 |
| Lekker Health Ltd | Health & social care | 2023 |
| Leverswift Limited | Transport & logistics | 1992 |
| Liberate Healthcare Ltd | Administrative & support | 2017 |
| Life Force Psychology Ltd | Health & social care | 2021 |
| Lifestyle Care UK Ltd | Health & social care | 2007 |
| Lifewise Technologies Limited | Education | 2020 |
| Light & Power Systems Ltd | Other services | 2008 |
| Lilybeth Classic Car Co Limited | Administrative & support | 2018 |
| Lime Grove Trading Limited | Administrative & support | 2015 |
| Liminal Minds Limited | Professional & scientific | 2022 |
| Limitless Brands Ltd | Professional & scientific | 2022 |
| Lincoln Grange Management Limited | Households | 1970 |
| Lincoln Spur Road Limited | Households | 2017 |
| Linden House Residents Association Limited | Administrative & support | 2010 |
| Linetex Development Limited | Construction | 2023 |
| Linetex Investments Limited | Real estate | 1997 |
| Links Electrical Services Ltd | Construction | 2011 |
| Lion Care Home Ltd | Health & social care | 2024 |
| Listen (Law) Limited | Professional & scientific | 2009 |
| Liteworx.Tv Limited | Administrative & support | 2015 |
| Little Dormers Management Company Limited | Households | 2018 |
| Livestax Limited | Information & communication | 2013 |
| Livewire Editorial Communications Ltd | Professional & scientific | 2003 |
| LJO Construction Limited | Construction | 2011 |
| LJO Developments Ltd | Construction | 2026 |
| LLL Marketing Limited | Professional & scientific | 2022 |
| LM Scenic Construction Limited | Information & communication | 2022 |
| Loaded CUE Ltd | Administrative & support | 2025 |
| Loamshire Estates Ltd | Real estate | 2016 |
| Loamshire Property Management Ltd | Professional & scientific | 2016 |
| Lobjoit Limited | Professional & scientific | 2024 |
| Local Bathrooms Limited | Construction | 2015 |
| Local Plumbers (London) Limited | Construction | 2015 |
| Loch Ness Retreat Limited | Real estate | 2019 |
| Lockheart Developments Limited | Real estate | 2023 |
| Logic House Fleet Ltd | Real estate | 2026 |
| Logoman Sustainability Ltd. | Professional & scientific | 2010 |
| Loki Architecture and Development Ltd | Real estate | 2019 |
| Londex Property Limited | Real estate | 2015 |
| London Bridge Associates Limited | Construction | 2000 |
| London LPC Group Limited | Real estate | 2023 |
| London Prime Property Ltd | Real estate | 2022 |
| London Property Buildings Ltd | Construction | 2022 |
| London Shoulder Meeting Limited | Health & social care | 2015 |
| London Silk Boutique Limited | Manufacturing | 2019 |
| London Skyline Estates Ltd | Real estate | 2020 |
| London Tavi Clinic Ltd | Health & social care | 2023 |
| London Valve Therapies Limited | Health & social care | 2012 |
| Londonvita Ltd | Wholesale & retail | 2025 |
| Longtail Developments Limited | Real estate | 2025 |
| Longtail Property Group Ltd | Financial services | 2024 |
| Longtail Property Limited | Real estate | 2025 |
| Lord Nayyar Properties Limited | Real estate | 2021 |
| Lord Nayyar SA Limited | Real estate | 2022 |
| Lord’S Venture Limited | Hospitality | 2024 |
| Lothair (2019) Limited | Administrative & support | 2019 |
| Lotus Exotics Ltd | Wholesale & retail | 2025 |
| Lou's Deli Limited | Hospitality | 2024 |
| Louca Film Limited | Information & communication | 2025 |
| Loveraw Smart Ltd | Wholesale & retail | 2025 |
| Lowline (SA) Limited | Transport & logistics | 1989 |
| LPS Consultancy Ltd | Information & communication | 2025 |
| LQ Group Ltd | Other services | 2024 |
| LSH Funeral Support Limited | Other services | 2019 |
| Lucal Limited | Professional & scientific | 2008 |
| Lucyandloulou Ltd | Other services | 2024 |
| Lumani Media Ltd | Professional & scientific | 2025 |
| Luna Childminder Limited | Health & social care | 2021 |
| Luna Rossa Gerrards Cross Ltd | Hospitality | 2010 |
| Lunar Developments Ltd | Real estate | 2012 |
| LUX Living Interiors Limited | Wholesale & retail | 2019 |
| Luxury 1 Developments Limited | Real estate | 2012 |
| Luxury Designer Apparel Ltd | Administrative & support | 2024 |
| Lves Broadcast Ltd | Information & communication | 2024 |
| LVO Ltd | Administrative & support | 2025 |
| Lynbury Place Management Company Limited | Households | 2016 |
| Lyndon House Care Limited | Health & social care | 2024 |
| Lynford Estate Holdings Ltd | Real estate | 2019 |
| Lynford Homes Ltd | Construction | 2019 |
| Lynford Land & Development Ltd | Real estate | 2021 |
| Lyttleton Consultancy Ltd | Professional & scientific | 2015 |
| M Cafe Bistro Ltd | Hospitality | 2025 |
| M Jatania Capital Limited | Other services | 2012 |
| M V Consulting Services Limited | Information & communication | 1998 |
| M&C Consolidated Enterprises Limited | Real estate | 2004 |
| M&S Developments South East Limited | Real estate | 2024 |
| M.R. Heat Ltd | Construction | 2014 |
| MA Cher (UK) Limited | Wholesale & retail | 1990 |
| MA Wolfe Consulting Ltd | Professional & scientific | 2026 |
| MAA Associates Limited | Extraterritorial | 2017 |