| Lefebvre Knowledge Limited | Information & communication | 1998 |
| Left-Field Holdings (U.K.) Limited | Financial services | 2025 |
| Legacy Contracts Group Ltd | Construction | 2024 |
| Legacy Fibre Limited | Construction | 2022 |
| Legacy Insulations Ltd | Construction | 2025 |
| Legacy Real Estate Trading Ltd | Real estate | 2023 |
| Legacy Shine Services Limited | Administrative & support | 2026 |
| Legacybridge Investment Ltd | Real estate | 2026 |
| Legal Clear Limited | Financial services | 2009 |
| Legal Conveyancing Ltd | Real estate | 2023 |
| Legend Removals Ltd | Transport & logistics | 2011 |
| Legend Waste Management Ltd | Water & waste | 2020 |
| Lehara Enterprises Ltd | Other services | 2022 |
| Lehumo & Lefa Holdings Ltd | Health & social care | 2020 |
| Leigh Services Ltd | Administrative & support | 2016 |
| Leigham Estates Limited | Real estate | 2016 |
| Leisure Grounds Maintenance Limited | Administrative & support | 2003 |
| Leisurequest (Paintballing) Ltd | Arts & recreation | 2012 |
| Lemar Ltd | Construction | 2002 |
| Lendz Limited | Professional & scientific | 2025 |
| Lenham Barn Limited | Other services | 2013 |
| LEO Jones Worldwide Limited | Wholesale & retail | 2023 |
| Leopard Production Services Limited | Arts & recreation | 2022 |
| Lepson Flats Management Company Limited | Households | 1997 |
| Leraine Enterprises Ltd | Professional & scientific | 2015 |
| Lerge Limited | Real estate | 2017 |
| LES Trois Film Ltd | Information & communication | 2024 |
| Leslie Crawley & Partners Ltd | Construction | 2009 |
| Lesvic Limited | Construction | 2006 |
| Let's Make Pizza C.I.C. | Education | 2024 |
| Let's Talk Speech & Language Therapy Limited | Health & social care | 2024 |
| Let-A-Lot Ltd | Administrative & support | 2003 |
| Letchford Enforcement Limited | Professional & scientific | 2020 |
| Letchmore Broiler Company Limited(The) | Real estate | 1958 |
| Letskent Limited | Real estate | 2017 |
| Level Financial Technology Limited | Information & communication | 2018 |
| Level UP Health Store Ltd | Wholesale & retail | 2025 |
| Level UP Scaffolding (Surrey) Ltd | Construction | 2024 |
| Level UP Vending Limited | Wholesale & retail | 2026 |
| Levin Design Limited | Construction | 2021 |
| Levine (Vehicles) Limited | Wholesale & retail | 2005 |
| Levy Online Ltd. | Education | 2020 |
| Levy PMU Ltd | Administrative & support | 2019 |
| Levylasers Ltd | Other services | 2024 |
| Lewis's Property Management Ltd | Real estate | 2019 |
| Lewken Limited | Construction | 2026 |
| Lexington Consulting Limited | Professional & scientific | 2026 |
| Lexxwood and Associates Limited | Professional & scientific | 2021 |
| LFR Mortgages and Wealth LLP | | 2024 |
| LFX Ltd | Professional & scientific | 2023 |
| LG Properties Surrey Limited | Real estate | 2024 |
| LG Talentquest Group Limited | Financial services | 2023 |
| LGB Rail Ltd | Construction | 2023 |
| LH Construction & Management Ltd | Construction | 2022 |
| LH Technical Consulting Limited | Professional & scientific | 2021 |
| LH Writes Ltd | Professional & scientific | 2019 |
| LH1 Global Ltd | Real estate | 2017 |
| LHM Maintenance Ltd | Households | 2021 |
| LIA Build Ltd | Construction | 2026 |
| Liam MAC Ltd | Other services | 2017 |
| Liam&Tillie’S Recovery Ltd | Wholesale & retail | 2025 |
| Liana&Leyla Limited | Real estate | 2025 |
| Lianne Limited | Transport & logistics | 2017 |
| Libertas Properties Limited | Construction | 2020 |
| Library Suite Ltd | Information & communication | 2020 |
| Lidak Limited | Hospitality | 2019 |
| Life CARE4U Ltd | Health & social care | 2015 |
| Life Filing Ltd | Professional & scientific | 2007 |
| Life IS Online Ltd | Wholesale & retail | 2025 |
| Life Lore Workshops Ltd | Extraterritorial | 2022 |
| Life N Soul Ltd | Hospitality | 2024 |
| Lifeboat Lettings Ltd | Real estate | 2017 |
| Lifecells Group Limited | Manufacturing | 2019 |
| Lifehoist Ltd | Professional & scientific | 1992 |
| Lifestart Solutions Limited | Professional & scientific | 2015 |
| Lifestyle Carpentry & Construction Limited | Construction | 2012 |
| Lifethrives C.I.C | Health & social care | 2009 |
| Lifetrust Group Ltd | Professional & scientific | 2018 |
| Light Commercial Resprays Ltd | Wholesale & retail | 2018 |
| Light-Co Property Services Ltd | Construction | 2025 |
| Lightfox Entertainment Limited | Manufacturing | 2020 |
| Lighting Effects Distribution (Projects) Limited | Wholesale & retail | 2005 |
| Lightrock Power Limited | Professional & scientific | 2017 |
| Lights & Loons Kent Ltd | Hospitality | 2025 |
| Lightworks Studios Ltd | Information & communication | 2024 |
| Lilac Estates Limited | Hospitality | 2004 |
| Lillie Property Ltd | Real estate | 2022 |
| Lilwah Galleries Limited | Arts & recreation | 2006 |
| Lily Rose Kitchens Ltd | Wholesale & retail | 2024 |
| Lily's Social Kitchen CIC | Hospitality | 2018 |
| Lily's Tattoos Ltd | Arts & recreation | 2019 |
| Lilypad Property Services Limited | Real estate | 2006 |
| Limitless Financial Group Limited | Professional & scientific | 2022 |
| Limitless X Reliks Ltd | Manufacturing | 2025 |
| Linako Limited | Health & social care | 2025 |
| Link the World Limited | Professional & scientific | 1998 |
| LINK365 Building Services Limited | Construction | 2017 |
| Links Roofing Ltd | Construction | 2024 |
| Linlan Care Limited | Health & social care | 2016 |
| Linnett Electrical Ltd | Construction | 2024 |