| Lady Young's Beauty & Cosmetics Limited | Other services | 2024 |
| Laikha Limited | Hospitality | 2019 |
| Lala Boutique Ltd | Wholesale & retail | 2018 |
| Lamba Ltd | Wholesale & retail | 2025 |
| Lambrook School Trust Limited | Education | 1967 |
| Lambrook Foundation | Education | 2025 |
| Lambrook School (International) Limited | Administrative & support | 2019 |
| Lambrook Sports and Leisure Club Limited | Arts & recreation | 1994 |
| LAN to LAN (Consulting) Limited | Information & communication | 2001 |
| Landean Developments Ltd | Construction | 2018 |
| Landean Investments Ltd | Real estate | 2018 |
| Landscape Dreams Ltd | Administrative & support | 2015 |
| Landscape Solutions Surrey Ltd | Administrative & support | 2023 |
| Langleywright Roofing Ltd | Construction | 2026 |
| Lapsae Aquilae Ltd | Real estate | 2023 |
| Larabellalashes Ltd | Other services | 2025 |
| Large Consulting Limited | Administrative & support | 2009 |
| Large Holdings Limited | Financial services | 2022 |
| Lary's Cleaners Ltd | Administrative & support | 2022 |
| Latte Collective Ltd | Extraterritorial | 2020 |
| Launchpoint Group Limited | Administrative & support | 2026 |
| Lava Sauna Limited | Wholesale & retail | 2025 |
| Lawnify Ltd | Administrative & support | 2024 |
| LAY Away UK Ltd | Construction | 2021 |
| Layer 47 Ltd | Information & communication | 2022 |
| Layerco Ltd | Manufacturing | 2026 |
| Lazar Transport Solutions Ltd | Transport & logistics | 2020 |
| Lazaroi Motor Ltd | Wholesale & retail | 2022 |
| LB Avenue Ltd | Construction | 2023 |
| LCA PM Services Limited | Information & communication | 2013 |
| LD Drainage Services Ltd | Water & waste | 2025 |
| LDB Events Ltd | Professional & scientific | 2012 |
| LDC Design & Build Ltd | Construction | 2023 |
| LDN Code Ltd | Information & communication | 2019 |
| Leaderlike Limited | Professional & scientific | 2016 |
| Leaf Wrench Designs Ltd | Professional & scientific | 2024 |
| League of Heroes Fitness Limited | Arts & recreation | 2020 |
| Leap Equine Limited | Health & social care | 2019 |
| LEARN2LICENCE Ltd | Education | 2025 |
| Leave Dates Ltd | Information & communication | 2025 |
| LEB Electrical Ltd | Construction | 2014 |
| LEE Cooper Training Limited | Arts & recreation | 2002 |
| Leeson Effects Limited | Information & communication | 2016 |
| Lefinsys Ltd. | Information & communication | 2015 |
| Lefort U.K. Limited | Wholesale & retail | 2002 |
| Legg Plumbing and Heating Ltd | Construction | 2016 |
| Leisurescene Limited | Other services | 2008 |
| Lekker Media Ltd | Administrative & support | 2007 |
| Lemar Services South Ltd | Construction | 2010 |
| Lemic Company Limited | Health & social care | 2013 |
| Lemongrass Thai Therapy Ltd | Health & social care | 2011 |
| Lenshood Ltd | Information & communication | 2026 |
| Leona's Cakes and Bespoke Catering Limited | Hospitality | 2020 |
| Leopard Consulting Ltd | Professional & scientific | 2014 |
| Leopard Learning and Leadership Limited | Professional & scientific | 2018 |
| LET Luce Ltd | Professional & scientific | 2018 |
| LET ME Help Limited | Real estate | 2026 |
| Letis Group Ltd | Construction | 2021 |
| Letting-Aid Limited | Real estate | 2013 |
| Lewis Welding Services Limited | Manufacturing | 2025 |
| Leytime Limited | Professional & scientific | 1979 |
| LF Rigging Services Ltd | Information & communication | 2018 |
| LFF FND One Limited | Financial services | 2023 |
| Lgee Limited | Administrative & support | 2012 |
| LGM Advisory Ltd | Financial services | 2015 |
| LHA Catering Ltd | Hospitality | 2024 |
| LHR Locksmiths Ltd | Other services | 2018 |
| Lianja Inc. Limited | Information & communication | 2012 |
| Liberty Flooring Limited | Construction | 2004 |
| Life Coaching With Lyndsey Ltd | Administrative & support | 2025 |
| Lifestyle Medical Practice Ltd | Health & social care | 2020 |
| Lift Buddy Ltd | Construction | 2018 |
| Light Mind Limited | Arts & recreation | 2016 |
| Lightfoots (EST. 1897) Limited | Wholesale & retail | 1947 |
| Lighthouse Residential Property Ltd | Real estate | 2021 |
| Lihat Construction Ltd | Construction | 2019 |
| Lihat Groundworks Ltd | Construction | 2019 |
| Lika Building Ltd | Construction | 2024 |
| Limewood Property Solutions Limited | Construction | 2014 |
| Limpid Learning Limited | Administrative & support | 2013 |
| Line UP Consult Limited | Professional & scientific | 2023 |
| Link Planning and Consulting Limited | Professional & scientific | 2020 |
| Link-Runner Ltd | Information & communication | 2026 |
| Linkrite Limited | Real estate | 2001 |
| Lion House Group Ltd | Financial services | 2025 |
| Lisa Morgan Interiors Ltd | Manufacturing | 2019 |
| Lisakhanya Limited | Health & social care | 2013 |
| Littech AI Limited | Information & communication | 2023 |
| Little Leggies Ltd | Wholesale & retail | 2020 |
| Little Logbook Ltd | Information & communication | 2022 |
| Little Movers and Shakers Ltd | Arts & recreation | 2022 |
| Little Plumkins Limited | Wholesale & retail | 2022 |
| Littlebizsuccess Limited | Wholesale & retail | 2019 |
| Littlecote Technical Services Ltd | Information & communication | 2010 |
| Littlehaven Management Company Ltd | Households | 2019 |
| Live Like Kings Ltd | Wholesale & retail | 2015 |
| Liviu Stone Ltd | Transport & logistics | 2023 |
| LJH Services Ltd | Professional & scientific | 2025 |
| LJR Consulting Ltd | Professional & scientific | 2022 |
| LK Carpentry & Building Ltd | Construction | 2025 |