| Lanzaco Ltd | Wholesale & retail | 2026 |
| Lareska Limited | Households | 2023 |
| Lark Concepts Ltd | Wholesale & retail | 2026 |
| Lark's PUB Company Limited | Hospitality | 2017 |
| LAS Autobahn Motors Ltd | Wholesale & retail | 2024 |
| LAS Kitchens Ltd | Construction | 2022 |
| Lash City Ltd | Wholesale & retail | 2024 |
| Lasting Impressions Glazing Limited | Construction | 2022 |
| Lasting Impressions Home Improvements Limited | Construction | 2015 |
| Lasting Impressions Pure Wash Limited | Administrative & support | 2023 |
| Lathkill Consulting Services Ltd | Transport & logistics | 2013 |
| Latitude Design & Build Limited | Construction | 2026 |
| Latitude Fintech Limited | Financial services | 2026 |
| Latt (Midlands) Limited | Construction | 2010 |
| Lattice Training Ltd | Other services | 2015 |
| Launch Point UK Consultants Ltd | Professional & scientific | 2025 |
| Launchbury Limited | Arts & recreation | 2012 |
| Launchcode AI Limited | Administrative & support | 2025 |
| Lauren Barker Aesthetics Limited | Health & social care | 2023 |
| Lauri K Ltd | Professional & scientific | 2020 |
| Lavante Developments Ltd | Real estate | 2025 |
| Lavante Ltd | Construction | 2022 |
| Lavolta Events Ltd | Hospitality | 2019 |
| Lavolta's Dance Events Franchise Ltd. | Professional & scientific | 2023 |
| Lawes Electrical & Renewables Ltd | Construction | 2025 |
| Lawn and Order Gardening Limited | Administrative & support | 2024 |
| Lawson Holdings Ltd | Financial services | 2025 |
| Lawton Electrical Ltd | Construction | 2018 |
| Lawton Electrical Services Limited | Construction | 2024 |
| Layak Nalayak Ltd | Information & communication | 2025 |
| Layals Limited | Wholesale & retail | 2016 |
| Layke Holdings Limited | Financial services | 2019 |
| Layton&Laytonproperties Ltd | Real estate | 2025 |
| LAZ Omer Ltd | Hospitality | 2026 |
| LB & J Mather Limited | Construction | 2005 |
| LB Electrical Contractors Ltd | Construction | 2010 |
| LB Joinery and Building Services Ltd | Construction | 2020 |
| LBA Electrical Limited | Manufacturing | 2011 |
| LBM Consulting Services Limited | Professional & scientific | 2023 |
| LBS Retail Limited | Wholesale & retail | 2020 |
| LBX Plumbing & Heating Ltd | Construction | 2022 |
| LDH Investments Limited | Hospitality | 2020 |
| LDJ Audiology Ltd | Health & social care | 2026 |
| Leadaction Ltd | Wholesale & retail | 2021 |
| Leaders (Derbyshire) Limited | Wholesale & retail | 2003 |
| Leadmill Road Industry Ltd | Manufacturing | 2020 |
| Leadshark AI Ltd | Information & communication | 2026 |
| Leadverve AI Limited | Information & communication | 2024 |
| Leadzilla Ltd | Professional & scientific | 2022 |
| Leafoak Properties Ltd | Real estate | 2025 |
| Lean Business Services Limited | Administrative & support | 2014 |
| Learning Unlimited ATA Limited | Education | 2012 |
| Leawood Manufacturing Ltd. | Manufacturing | 1998 |
| LEE Jackson Roofing & Building Services Ltd | Construction | 2015 |
| LEE John Wallhead Ltd | Extraterritorial | 2024 |
| LEE Leisure Ltd | Construction | 2001 |
| LEE Wrath Building Services Ltd. | Construction | 2025 |
| LEE Wren Ltd | Construction | 2016 |
| Leeds Skills Academy Limited | Extraterritorial | 2020 |
| Leen Valley Golf Limited | Arts & recreation | 2010 |
| Leesa Devlin Limited | Administrative & support | 2021 |
| Lefra Ltd | Transport & logistics | 2023 |
| Legacy & Lore Ltd | Wholesale & retail | 2025 |
| Legacymomentsfilmsuk Ltd | Information & communication | 2025 |
| Legit Ltd | Information & communication | 2026 |
| Lehavern Property Management Limited | Real estate | 2025 |
| Leigh & Rose Construction Ltd | Construction | 2025 |
| Leigh Merry Limited | Construction | 2010 |
| Leighton Construction and Landscaping Ltd | Construction | 2025 |
| Leinster Enterprises Limited | Wholesale & retail | 2022 |
| Lemon Grass Oriental Supermarkets Ltd | Wholesale & retail | 2009 |
| Lemons & Sons Company Limited | Construction | 2023 |
| LEN Gregory & SON Ltd | Real estate | 2025 |
| Lendever Gundogs Limited | Wholesale & retail | 2024 |
| Lendever Limited | Other services | 2019 |
| Lendever Nutrition Limited | Wholesale & retail | 2026 |
| Lennon's Pool and Snooker Ltd | Arts & recreation | 2018 |
| LEO Heating Systems Ltd | Construction | 2020 |
| LEO Wealth Management Limited | Financial services | 2014 |
| Leon's Fish Bar Ltd | Wholesale & retail | 2012 |
| Leonard-Jean Properties Limited | Real estate | 2022 |
| Leonide Interiors Ltd | Wholesale & retail | 2014 |
| Leprechauns OUT of School Club Limited | Education | 2002 |
| LES Jones Hair Ltd | Other services | 2026 |
| LES Saunders Limited | Financial services | 2010 |
| Leslie George Saunders Limited | Financial services | 2019 |
| Leslie Stewart Innovations Ltd | Professional & scientific | 2021 |
| Let's Connect Communities Together Ltd | Administrative & support | 2019 |
| Letterbox FOX Media Ltd | Education | 2022 |
| Level UP Exterior Cleaning Ltd | Administrative & support | 2024 |
| Leverton Investments Limited | Financial services | 2022 |
| Leverton UK Services Limited | Construction | 1997 |
| Lewington Property Limited | Real estate | 2021 |
| LG German Autos Ltd | Water & waste | 2021 |
| LG Hobley Design Ltd | Professional & scientific | 2025 |
| LG Pantry Cafe Ltd | Hospitality | 2025 |
| LH Fitness Ltd | Arts & recreation | 2023 |
| LH Rentals Limited | Real estate | 2019 |
| Lhcm Developments Ltd | Construction | 2023 |
| Lhrc Holdings Ltd | Financial services | 2025 |