| LCL Properties Ltd | Real estate | 2021 |
| LCL Services Ltd | Administrative & support | 2017 |
| LE Damas Ltd | Hospitality | 2018 |
| Leading Edge Kinetic Ltd | Information & communication | 2026 |
| Leahcim MM Ltd | Agriculture & fishing | 2022 |
| Lean SIX Sigma Experts Corporation Ltd | Professional & scientific | 2011 |
| Lean-Production Limited | Administrative & support | 2010 |
| Leave IT 2 Steph Limited | Professional & scientific | 2011 |
| Lebanese Kebab Limited | Hospitality | 2023 |
| Leepo Limited | Transport & logistics | 2025 |
| Leete Limited | Households | 2000 |
| Leete Secretarial Services Limited | Households | 2015 |
| Left Hook Properties Ltd | Households | 2025 |
| Legacy 23 Ltd | Administrative & support | 2024 |
| Legacy Equities Ltd | Real estate | 2021 |
| Legacy Lodgings Ltd | Hospitality | 2021 |
| Legendary Pubs Limited | Hospitality | 2012 |
| Legendary Tech Ltd | Wholesale & retail | 2019 |
| Legion House (UK) Ltd | Real estate | 2007 |
| Leicestershire Solar 1 Limited | Energy | 2020 |
| Leigh Court RTM Company Limited | Households | 2010 |
| Leisure Focus Limited | Hospitality | 2021 |
| Leitelmayer Trading Limited | Administrative & support | 2020 |
| Lelions Ltd | Wholesale & retail | 2020 |
| Lena-Car Ltd | Wholesale & retail | 2018 |
| Lent Rise Burnham Blocks A&B Management Limited | Administrative & support | 1999 |
| Leomax Estates Ltd | Real estate | 2021 |
| Leonard Hackett Memorial Trust(The) | Health & social care | 1980 |
| Leonex Ltd | Real estate | 2022 |
| Leopard Contracts Limited | Other services | 2014 |
| Leopold Place Management Company Ltd | Real estate | 2016 |
| Lesley Bosworth Consultancy Limited | Information & communication | 2011 |
| Lesley Long Limited | Administrative & support | 2006 |
| Lets DO IT Limited | Households | 2011 |
| Levels Education Ltd | Education | 2023 |
| Lewandowska Property Ltd | Real estate | 2023 |
| Leworth Ltd | Hospitality | 2021 |
| LF Evergreen Limited | Professional & scientific | 2023 |
| LG Engineering Services Ltd | Professional & scientific | 2024 |
| LH Premier Property Services Limited | Construction | 2014 |
| Liam P Alleyne Limited | Administrative & support | 2016 |
| Libertas Homes Ltd | Real estate | 2019 |
| Liberty Holiday Lets Limited | Administrative & support | 2023 |
| Liberty Holiday Lodges Limited | Hospitality | 2025 |
| Liberty Integrated Healthcare Services Ltd | Health & social care | 2026 |
| Libra Consultancy Limited | Information & communication | 1999 |
| Life IS a Ride Ltd | Administrative & support | 2023 |
| Life Property Construction Limited | Construction | 2018 |
| Life Property Investments Limited | Real estate | 2010 |
| Life Time Property Maintenance Ltd | Real estate | 2023 |
| Lifestyles Homes Limited | Construction | 2002 |
| Lifestyles Trading Ltd | Wholesale & retail | 2020 |
| Lighting Logistics Limited | Construction | 2007 |
| Lilibet Souvenirs Ltd | Wholesale & retail | 2023 |
| Limelight CTL Limited | Information & communication | 2009 |
| Limestone Property Group Limited | Real estate | 2025 |
| Linda-Jean Women's Motorcycle Fashion Ltd | Wholesale & retail | 2024 |
| Lineage Tree Care Limited | Administrative & support | 2023 |
| Lineaum Ltd | Transport & logistics | 2021 |
| Linen & Moore Limited | Wholesale & retail | 2018 |
| Links Gymnastics (Berkshire) Ltd | Arts & recreation | 2017 |
| Links Leisure Ltd | Arts & recreation | 2023 |
| Linnia Ltd | Professional & scientific | 2018 |
| Lioncub Productions Ltd | Information & communication | 2021 |
| Lisben Estates Ltd | Real estate | 2010 |
| Litework Properties Ltd | Real estate | 2025 |
| Little Hamlins Limited | Real estate | 2017 |
| Littleacre Freehold Limited | Real estate | 2015 |
| Live by Demonstration Ltd | Administrative & support | 2026 |
| Lived Holdings Limited | Financial services | 2021 |
| Living Systems Consulting Limited | Professional & scientific | 2020 |
| LJL Clinical Limited | Professional & scientific | 2017 |
| Llugiqi Properties Ltd | Real estate | 2025 |
| Lmcn Limited | Public administration | 2026 |
| Lo&Lu Ltd | Real estate | 2026 |
| Local Roots Limited | Other services | 2024 |
| Lodge Security Team Ltd | Administrative & support | 2013 |
| Lodos Corporation Limited | Professional & scientific | 2023 |
| Lodos Property Limited | Real estate | 2025 |
| Logicpulse Solutions Ltd | Real estate | 2025 |
| Logitech UK Limited | Professional & scientific | 1987 |
| Loka Propertyies Ltd | Real estate | 2025 |
| Lombard Pressings Limited | Administrative & support | 1973 |
| Lombi Property Group Ltd | Real estate | 2025 |
| London Biotechnology Solutions Limited | Education | 2019 |
| London Building Services Management Ltd | Construction | 2026 |
| London Cardiac Clinic Limited | Health & social care | 2013 |
| London City Falcons Basketball Ltd | Education | 2026 |
| London High Investors Ltd | Real estate | 2025 |
| London Lifesciences Ltd | Manufacturing | 2018 |
| London Medical Exchange Limited | Education | 2019 |
| London Road (Slough) Management Ltd | Households | 2007 |
| London Roof Gardens Limited | Construction | 2023 |
| Long Walk (Windsor) Management Company Limited | Households | 2012 |
| Long Walk Grill and Bar Ltd | Hospitality | 2020 |
| Longfields Park Management Limited | Households | 1987 |
| Lonoma Limited | Hospitality | 2009 |
| Lords One Construction Limited | Education | 2025 |
| Lorina Waters Coaching & Consulting Ltd | Professional & scientific | 2023 |
| Lorne Street Management Company Limited | Real estate | 2007 |