| Land & Home Investments Ltd | Construction | 2022 |
| Land and Home Sourcing Ltd | Real estate | 2023 |
| Lane Elite Services Ltd | Hospitality | 2025 |
| Lane Marking Removal Ltd | Construction | 2025 |
| Lanfrin Limited | Administrative & support | 2020 |
| Lange Residential Limited | Real estate | 2024 |
| Langford Haulage Services Ltd | Transport & logistics | 2003 |
| Lango Consultancy Ltd | Health & social care | 2026 |
| Lapow Group Limited | Other services | 2015 |
| Lapow Property Ltd | Real estate | 2022 |
| Laptop Lifestyle Ltd | Education | 2018 |
| Larc Property Ltd | Construction | 2025 |
| Larems Limited | Health & social care | 2020 |
| Larkeshmos Limited | Health & social care | 2016 |
| Larrybass Limited | Professional & scientific | 2016 |
| Lash Holdings Limited | Professional & scientific | 2005 |
| Last Glance Ltd | Professional & scientific | 2017 |
| Last Investments Ltd | Real estate | 2023 |
| Last Mile Excellence Limited | Transport & logistics | 2025 |
| Last Trip Services Ltd | Other services | 2021 |
| LASTINV44A Ltd | Real estate | 2023 |
| Lateko Prime Solutions Limited | Wholesale & retail | 2026 |
| Laterum Construction Ltd | Construction | 2022 |
| Laufremik Group Holdings Limited | Professional & scientific | 2010 |
| Laur Driver Ltd | Transport & logistics | 2026 |
| Laura Belcher Ltd | Administrative & support | 2020 |
| Laura Burke Training and Consultancy Limited | Administrative & support | 2022 |
| Lauren Appleby Consultancy Ltd | Professional & scientific | 2026 |
| Lauretta Kavanagh Consulting Limited | Professional & scientific | 2016 |
| Lavender Dental Care Ltd | Health & social care | 2016 |
| Lavproperty Ltd | Real estate | 2023 |
| Lawson Technical Services Ltd | Manufacturing | 2015 |
| Lawtronics Limited | Extraterritorial | 1974 |
| Lazdan Builders Merchants Limited | Wholesale & retail | 1975 |
| Lazdan Flats Limited | Real estate | 2025 |
| Lazer Ceilings and Office Refurbishments Limited | Construction | 2002 |
| LBB Enterprises Ltd | Other services | 2024 |
| LC Logistics Ltd | Transport & logistics | 2023 |
| LCC Premium Foods Limited | Wholesale & retail | 2024 |
| LCC Specialists Limited | Administrative & support | 2020 |
| LCJ Football Education & Mentoring Limited | Education | 2025 |
| Lckn Limited | Real estate | 2016 |
| LDH Attachments Ltd | Wholesale & retail | 2011 |
| LDT Medics Limited | Health & social care | 2013 |
| LE Koudis Ltd | Real estate | 2024 |
| Leadenhall Executive Search Limited | Administrative & support | 2004 |
| Leadership Value Insights Ltd | Professional & scientific | 2025 |
| Leadingceo Ltd | Wholesale & retail | 2023 |
| Leadium Utilities Ltd | Administrative & support | 2024 |
| Leak Homes Limited | Real estate | 2009 |
| Leaksolve Ltd | Construction | 2026 |
| Leamington International Limited | Professional & scientific | 2015 |
| Lean Life Limited | Professional & scientific | 2016 |
| Learning and Development Bureau Ltd | Professional & scientific | 2014 |
| Learning Lounge Limited | Extraterritorial | 2006 |
| Leather Concessionaires Limited | Extraterritorial | 2019 |
| Lebgas Gas&Heatingservices Limited | Energy | 2017 |
| LEC Fire Safety Solutions Ltd | Public administration | 2023 |
| Leeman and Sons Limited | Administrative & support | 2010 |
| Leeman Family Holdings Limited | Financial services | 2026 |
| Lefinno Limited | Health & social care | 2021 |
| Legacy Tribute UK Limited | Wholesale & retail | 2015 |
| Legal Immigration Lawyers Ltd | Professional & scientific | 2026 |
| Legends (Management) Limited | Administrative & support | 2015 |
| Legy Properties Services Ltd | Real estate | 2024 |
| Lekmore Services Limited | Hospitality | 2018 |
| Leni’S Delight Cakes Ltd | Manufacturing | 2019 |
| Lentico Ltd | Manufacturing | 2013 |
| Leon's Tiling Limited | Construction | 2024 |
| Leontex Limited | Wholesale & retail | 2023 |
| Lepa.Es Dent Limited | Health & social care | 2025 |
| Lerrihost Ltd | Information & communication | 2013 |
| Letbudget Holdings Limited | Financial services | 2025 |
| Letbudget Logistics Limited | Transport & logistics | 2026 |
| Letbudget Properties Limited | Real estate | 2025 |
| Letiverse Limited | Professional & scientific | 2025 |
| Lets 11 Ltd | Hospitality | 2006 |
| Leumas Electrical Services Limited | Construction | 2026 |
| Level UP FX Ltd | Financial services | 2021 |
| Level UP Leads Limited | Professional & scientific | 2023 |
| Leverlake Limited | Real estate | 2020 |
| Levitikus Limited | Real estate | 2017 |
| Lewis Freegard Investments Limited | Real estate | 1946 |
| Lewis Haulage Limited | Transport & logistics | 2024 |
| Lewis-Cole Psychology Services Limited | Education | 2024 |
| Lewtas Brewery Ltd | Manufacturing | 2020 |
| LEX Digitas Ltd | Professional & scientific | 2023 |
| Leybourne Autos Ltd | Wholesale & retail | 2014 |
| LG Motors Ltd | Wholesale & retail | 2025 |
| LG N More Limited | Health & social care | 2015 |
| LHB Consultants Limited | Information & communication | 2009 |
| LHD Holdings Limited | Real estate | 2017 |
| Liam Transport Ltd | Transport & logistics | 2023 |
| Libra Facilities Ltd | Other services | 2003 |
| Libra Utility Services Ltd | Water & waste | 2021 |
| Lickerish Limited | Administrative & support | 2002 |
| Lider Rachev Ltd | Transport & logistics | 2020 |
| Lidertax Ltd | Professional & scientific | 2012 |
| Lidster and Whiting Limited | Manufacturing | 1977 |
| Life Neuma Church Ltd | Education | 2025 |