| LBL Trans Limited | Transport & logistics | 2017 |
| Lbrod Ltd | Manufacturing | 2016 |
| LBS Scaffolding Services Limited | Construction | 2019 |
| Lbslanagroup Ltd | Information & communication | 2025 |
| LBT L UK 1 Ltd | Administrative & support | 2025 |
| LBW Business Consulting Limited | Administrative & support | 2009 |
| LC & RJ Properties Ltd | Real estate | 2017 |
| LC Cardiff Ltd | Hospitality | 2024 |
| LC Dynamics Ltd | Wholesale & retail | 2022 |
| LC Inspection Services Limited | Other services | 2016 |
| LC Smiles Limited | Health & social care | 2022 |
| LC Staff Limited | Hospitality | 2018 |
| LC Taste Limited | Hospitality | 2025 |
| LC Ventures Limited | Professional & scientific | 2016 |
| LC Venues Ltd | Hospitality | 2019 |
| Lc.Tiva. Limited | Administrative & support | 2024 |
| LC61 Ltd | Other services | 2020 |
| LCB Cooling Ltd | Energy | 2020 |
| LCB IT Consultancy Ltd | Information & communication | 2015 |
| LCB Morales Ltd | Information & communication | 2025 |
| LCB Propco 2 Limited | Real estate | 2019 |
| LCB Propco Limited | Real estate | 2017 |
| LCC Worldwide Sales LLP | | 2025 |
| Lcdrecovery.Uk Ltd | Other services | 2018 |
| Lced Trade Ltd | Wholesale & retail | 2024 |
| Lceland Aurora Travel Limited | Administrative & support | 2025 |
| LCF Livery Limited | Agriculture & fishing | 2006 |
| Lchdevelopments Ltd | Construction | 2025 |
| LCL Solutions PC | | 2019 |
| Lclb Ltd | Manufacturing | 2018 |
| LCM NO.1 Ltd | Hospitality | 2025 |
| Lcmm AR Ltd | Construction | 2026 |
| Lcmm Limited | Construction | 2020 |
| LCN Construction Ltd | Construction | 2011 |
| LCS Property Portfolio Ltd | Real estate | 2026 |
| Lcta Ltd | Households | 2021 |
| LCW Investing Ltd | Administrative & support | 2022 |
| LCY Media & Marketing Ltd | Manufacturing | 2025 |
| LD Health Ltd | Health & social care | 2021 |
| LD Technologies Ltd | Wholesale & retail | 2024 |
| LD Vehicle Solutions Ltd | Wholesale & retail | 2026 |
| LDC Trade Ltd | Wholesale & retail | 2020 |
| LDE Consulting Limited | Information & communication | 2002 |
| LDF Trading Ltd | Wholesale & retail | 2025 |
| Ldibri Limited | Wholesale & retail | 2023 |
| LDJ Jewellery Ltd | Wholesale & retail | 2024 |
| LDJ Lifting Services Limited | Construction | 2019 |
| LDL Property Ltd | Real estate | 2020 |
| LDN MED Limited | Wholesale & retail | 2022 |
| LDN Services Limited | Construction | 2016 |
| LDP Services - Leaflet Distribution Ltd | Transport & logistics | 2024 |
| LDP Services - Leaflet Printing Ltd | Manufacturing | 2024 |
| LDP Travel Ltd | Transport & logistics | 2026 |
| LDR Property Services Ltd | Real estate | 2026 |
| LDR Services Ltd | Wholesale & retail | 2019 |
| Ldrm Estates Limited | Real estate | 2021 |
| LDS Plumbing & Heating Bracknell Ltd | Construction | 2020 |
| LE Grand Lion Ltd | Wholesale & retail | 2025 |
| LE HUU Long Intelliabode Limited | Wholesale & retail | 2025 |
| LE Jardin Feng-Shui Limited | Professional & scientific | 2017 |
| LE Kang Co., Ltd | Wholesale & retail | 2024 |
| LE Mandela Limited | Hospitality | 2018 |
| LE Nouveau Cloud Ltd | Information & communication | 2025 |
| LE Paradox Showroom Limited | Professional & scientific | 2015 |
| LE Perle Italiane Limited | Wholesale & retail | 2015 |
| LE Petit Emporter Limited | Hospitality | 2023 |
| LE Regent Group Ltd | Other services | 2023 |
| LE ROI Ltd. | Wholesale & retail | 2023 |
| LE Sandwich Ltd | Hospitality | 2019 |
| Lea's Optical Co.,Limited | Real estate | 1948 |
| Lea's Tea Limited | Wholesale & retail | 2022 |
| Leabrooks Upholstery Limited | Extraterritorial | 1975 |
| Lead Healthcare Ltd | Health & social care | 2013 |
| Lead Louder Transformation Limited | Education | 2019 |
| Leada Utilities Ltd | Construction | 2014 |
| Leadenhall Cafe UK Limited | Extraterritorial | 2018 |
| Leader Boarde Ltd | Wholesale & retail | 2016 |
| Leading Edge Group (ICT) Limited | Information & communication | 2024 |
| Leading Edge Group (UK) Limited | Administrative & support | 2007 |
| Leading National Training Ltd | Wholesale & retail | 2007 |
| Leadior Bonnq International Limited | Wholesale & retail | 2020 |
| Leadnest Consulting Ltd | Information & communication | 2024 |
| Leadservice Media Ltd | Information & communication | 2022 |
| Leadstance International Ltd | Information & communication | 2025 |
| Leaf Development Limited | Administrative & support | 2013 |
| Leaf Estates Limited | Administrative & support | 2016 |
| Leaf International Equipment Rental Ltd | Administrative & support | 2025 |
| Leaf Lover Limited | Wholesale & retail | 2018 |
| Leaf Tech Systems Ltd | Information & communication | 2025 |
| Leagro Limited | Wholesale & retail | 1950 |
| Leahchard Ltd | Wholesale & retail | 2025 |
| Leam Salvage Ltd | Administrative & support | 2017 |
| Leaman Computing Limited | Information & communication | 2009 |
| Lean Competency Services Ltd | Professional & scientific | 2013 |
| Lean Development Ltd | Professional & scientific | 2012 |
| Lean Process Consultant Ltd | Professional & scientific | 2018 |
| Lean Shift Marketing Ltd | Wholesale & retail | 2026 |
| Leanway Brillant (UK) Limited | Professional & scientific | 2008 |
| Learn and Work Academy Ltd | Professional & scientific | 2022 |
| Learn Develop Train Ltd | Education | 2020 |