| Lararich Ventures Limited | Wholesale & retail | 2019 |
| Larch Build Ltd | Construction | 2018 |
| Larkstone Kitchen & Bathroom Installations Ltd | Construction | 2015 |
| Larmway Properties Limited | Construction | 2004 |
| Larryhamz Global Link UK Ltd | Real estate | 2022 |
| Larshika Limited | Wholesale & retail | 2026 |
| Lart Build and Design Limited | Construction | 2025 |
| Laser Signs (Longfield) Limited | Manufacturing | 2015 |
| Latifa Enterprises Limited | Other services | 2012 |
| Launch Diagnostics Holdings Limited | Professional & scientific | 2009 |
| Launch Diagnostics Limited | Health & social care | 1989 |
| Laura Ferguson Ltd | Administrative & support | 2012 |
| Lauren Minchington Ltd | Arts & recreation | 2021 |
| Lavender Dartford Ltd | Real estate | 2024 |
| Lavenham Films Ltd | Administrative & support | 2026 |
| Lawesh LLP | | 2025 |
| Lawford Chambers Ltd | Professional & scientific | 2020 |
| Lawrence & Winslade Ltd | Other services | 2023 |
| Lawrence and LEE Recruitment Ltd | Administrative & support | 2020 |
| Lawrence and Lowe Garden Design Ltd | Administrative & support | 2018 |
| Lawrence Marsh Contracts Limited | Construction | 2024 |
| Lawrenco PT Limited | Professional & scientific | 2007 |
| Lawsbridge Consultancy Services UK Ltd | Professional & scientific | 2022 |
| Lawson Villas Limited | Real estate | 2001 |
| Layash Ltd | Information & communication | 2018 |
| Laybod Ventures Limited | Information & communication | 2014 |
| LAZ Ltd | Hospitality | 2006 |
| LAZ5 Ltd | Wholesale & retail | 2023 |
| LB Business Holdings Ltd | Wholesale & retail | 2023 |
| LB Stone Consultants Ltd | Professional & scientific | 2025 |
| Lbgs Group Ltd | Construction | 2020 |
| Lbmk LLP | | 2017 |
| Lbse Ltd | Construction | 2022 |
| LC Private Hire Limited | Transport & logistics | 2012 |
| Lccompanypub Ltd | Hospitality | 2022 |
| LCS Group Kent Limited | Other services | 2019 |
| LCS Trans Ltd | Transport & logistics | 2021 |
| LCV Mechanical Solutions Ltd | Construction | 2025 |
| LD Industrial Plants Limited | Manufacturing | 2020 |
| LDB Limited | Professional & scientific | 2025 |
| LDE Greengrocers Ltd | Wholesale & retail | 2018 |
| LDG Consultancy Ltd | Professional & scientific | 2011 |
| LE Petit Lapin Bleu Ltd | Education | 2002 |
| Le'Georges Consulting Ltd | Information & communication | 2018 |
| Leadway Developments and Construction Ltd | Construction | 2023 |
| Leanne's Flowers Ltd | Wholesale & retail | 2013 |
| Leap Healthcare Limited | Health & social care | 2020 |
| Learn New Skills From Home Limited | Education | 2013 |
| Learnflo HI Ltd | Information & communication | 2022 |
| Learnflo Limited | Information & communication | 2020 |
| Learning Workz Ltd | Professional & scientific | 2018 |
| Lebbie Hills Ltd | Real estate | 2021 |
| Lednexora IT Services Private Limited | Information & communication | 2024 |
| LEE Capon Plumbing & Heating Limited | Construction | 2009 |
| LEE Ceramics Limited | Construction | 2014 |
| LEE Metal and Waste Recycling Ltd | Water & waste | 2023 |
| LEE Mundy Ltd | Transport & logistics | 2014 |
| LEE Residential Ltd | Real estate | 2021 |
| Leemeer Ltd | Manufacturing | 2025 |
| Leemusic Limited | Wholesale & retail | 2018 |
| Lees Hire Ltd | Administrative & support | 2012 |
| Legacy Estate and Wills Limited | Professional & scientific | 2025 |
| Legacy Executive Transport Ltd. | Transport & logistics | 2017 |
| Legacy FS Limited | Financial services | 2023 |
| Legacy Owned Ltd | Real estate | 2024 |
| Legacy Performing Arts LLP | | 2026 |
| Legostone Ltd | Manufacturing | 2020 |
| Lehi Solutions Ltd | Construction | 2025 |
| LEI Zang SI Temple (London) | Other services | 1996 |
| Leicester College Ltd | Education | 2023 |
| Lembridge Limited | Wholesale & retail | 2026 |
| Lemexie Ltd | Education | 2023 |
| Lendora Ltd | Financial services | 2026 |
| Lens of Light Events Ltd | Manufacturing | 2026 |
| Lens of Lights Ltd | Professional & scientific | 2022 |
| Lenscraft Advertising Ltd | Professional & scientific | 2025 |
| Leonardo Group Limited | Professional & scientific | 1986 |
| Leonardo Holdings Limited | Professional & scientific | 1999 |
| Lepelli Ltd | Construction | 2022 |
| Leramah Limited | Other services | 2026 |
| Lerekhi Ltd | Hospitality | 2019 |
| LES Bolla Ltd | Real estate | 2026 |
| LES Domaines UK Limited | Wholesale & retail | 2014 |
| Lesofos Properties Ltd | Real estate | 2024 |
| Lesser & Pavey Ltd. | Wholesale & retail | 1971 |
| Lessness Park Properties Limited | Households | 2016 |
| Let's ALL Go Limited | Administrative & support | 2015 |
| Leux Group Limited | Hospitality | 2024 |
| LEV Construction Group Ltd | Construction | 2025 |
| Level Consulting Engineers Ltd | Professional & scientific | 2025 |
| Level FIX Interiors Limited | Construction | 2016 |
| Levellight Limited | Professional & scientific | 1992 |
| Leven Wharf Limited | Construction | 2015 |
| Leviathan PNV Ltd | Wholesale & retail | 2021 |
| Levine Consulting Ltd | Professional & scientific | 2026 |
| Lewis & Jack Property Solutions Limited | Real estate | 2021 |
| Leyda Ltd | Hospitality | 2022 |
| Leygatecourt Limited | Construction | 1973 |
| Leyos Care Limited | Administrative & support | 2020 |
| LFC Consultancy Limited | Administrative & support | 2019 |