| Lcd&Parts Limited | Wholesale & retail | 2020 |
| LCG Research Ltd | Professional & scientific | 2026 |
| Lcog Constructions Ltd | Construction | 2024 |
| LCP Transport Ltd | Transport & logistics | 2019 |
| Lcpl Consultancy Ltd | Professional & scientific | 2024 |
| Lcuk Harrow Ltd | Other services | 2021 |
| LD Birmingham Limited | Construction | 2020 |
| LD P1 Limited | Real estate | 2025 |
| LDC News Service | Information & communication | 2011 |
| LDD Courses Limited | Education | 2013 |
| LDG Group Limited | Information & communication | 2025 |
| Ldgc Limited | Other services | 2021 |
| LDMGROUP1 Ltd | Construction | 2023 |
| Ldmv Properties Ltd | Real estate | 2023 |
| LDN Academy Limited | Education | 2022 |
| LDN Electronics Ltd | Manufacturing | 2020 |
| LDN Health UK Limited | Education | 2023 |
| LDN Investments(Uk) Limited | Real estate | 2020 |
| LDN KP Properties Limited | Real estate | 2025 |
| LDN Motors Ltd | Wholesale & retail | 2021 |
| LDN Physio Limited | Health & social care | 2017 |
| LDN Property Management Limited | Real estate | 2018 |
| Ldnfit Ltd | Arts & recreation | 2022 |
| LDS Primebuild Group Ltd | Construction | 2026 |
| LDV 1 Ltd | Construction | 2026 |
| LE & Co. Properties Limited | Real estate | 2026 |
| LE Bistingo Limited | Real estate | 1988 |
| LE French Rallye Limited | Other services | 2006 |
| LE Grande (Leopold) Ltd | Real estate | 2026 |
| LE Grande Group Ltd | Real estate | 2023 |
| LE Grande Ltd | Real estate | 2019 |
| LE Grey Ltd | Professional & scientific | 2018 |
| LE Rasa Limited | Manufacturing | 2025 |
| LE8 Countesthorpe Ltd | Construction | 2022 |
| LEA Road Developments Limited | Construction | 2024 |
| Leadenhall Search and Selection Ltd | Administrative & support | 2015 |
| Leader London Limited | Wholesale & retail | 2023 |
| Leading Global Education Ltd | Education | 2019 |
| Leafx Limited | Wholesale & retail | 2025 |
| League Productions Limited | Information & communication | 2021 |
| Leah Abbott Limited | Arts & recreation | 2021 |
| Leahy Agencies Limited | Wholesale & retail | 2011 |
| Lean Rise Foods Ltd | Manufacturing | 2025 |
| Leander Group Limited | Extraterritorial | 2020 |
| LEAP4SUCCESS Ltd | Administrative & support | 2011 |
| Leap@Forward Ltd. | Information & communication | 2016 |
| Leapeducate Limited | Education | 2024 |
| Leapwall Limited | Information & communication | 2018 |
| Lear Developments Holdings Limited | Financial services | 2014 |
| Learn Tech Media Limited | Information & communication | 2016 |
| Learn With Amisha Limited | Education | 2017 |
| Learnacharya Ltd | Information & communication | 2020 |
| Learning to FLY Therapeutic Care Ltd | Health & social care | 2025 |
| Learning to Learn Behaviour Consultancy Limited | Education | 2024 |
| Lease Vehicles Limited | Administrative & support | 1962 |
| Leasechime Property Management Limited | Households | 1990 |
| Leasehold Retrofit Consultancy Limited | Extraterritorial | 2022 |
| Leather Sensations Ltd | Wholesale & retail | 2018 |
| Leatherhead Commercial Properties Limited | Real estate | 2026 |
| Leavesden Consulting Limited | Professional & scientific | 2004 |
| Leavesden Court (1 - 49) Limited | Real estate | 2013 |
| Leavesden Court (1 - 49) RTM Company Limited | Households | 2013 |
| Leavesden Court Limited | Real estate | 2014 |
| Lebanese Bakeries 2000 Limited | Other services | 1998 |
| Lebanon Gate Limited | Wholesale & retail | 2009 |
| Lebeer Studios Limited | Information & communication | 2018 |
| Leben Designs Limited | Professional & scientific | 1998 |
| Leberstrasse Properties Limited | Real estate | 2013 |
| Lecco Management Services Limited | Administrative & support | 2015 |
| LED Cash & Carry Limited | Wholesale & retail | 2014 |
| Ledmax Ltd | Wholesale & retail | 2025 |
| Ledvalue Solutions Limited | Wholesale & retail | 2013 |
| LEE and Bentley EYE Practice Ltd. | Financial services | 2009 |
| LEE Film & TV Hire Limited | Extraterritorial | 2006 |
| LEE Sandales Limited | Information & communication | 2013 |
| Leemar Group Limited | Administrative & support | 2004 |
| Leena Homes Limited | Real estate | 2000 |
| Leena Plaza Limited | Hospitality | 2006 |
| Leewave Ltd | Wholesale & retail | 2020 |
| Leftbrain Hotshots Consulting UK Ltd | Professional & scientific | 2026 |
| Legacy Finance Limited | Professional & scientific | 2013 |
| Legacy Foods & Kitchen Limited | Wholesale & retail | 2026 |
| Legacy Invest Ltd | Real estate | 2024 |
| Legacy Travel & Immigration Limited | Professional & scientific | 2023 |
| Legacyadmin Limited | Administrative & support | 2024 |
| Legal Asset Ltd | Information & communication | 2017 |
| Legal Costing Services Ltd | Professional & scientific | 2013 |
| Legal Counsel Services Limited | Professional & scientific | 2019 |
| Legal Funding Limited | Financial services | 2005 |
| Legal Indemnity & Property Solutions Ltd | Financial services | 2025 |
| Legal Support and Admin Limited | Professional & scientific | 2015 |
| Legally Clean Ltd | Administrative & support | 2022 |
| Legend X UK Limited | Education | 2016 |
| Legenda Ltd | Construction | 2021 |
| Legends of Vinyl Limited | Other services | 2021 |
| Legiam Ltd | Wholesale & retail | 2021 |
| Legion Foods Holdings Ltd | Real estate | 2020 |
| Leibniz Investments Limited | Professional & scientific | 2016 |
| Leigh Court (Harrow) Limited | Households | 1984 |
| Leighway Brickwork Limited | Construction | 2013 |