| Ledger Pet Group Ltd | Other services | 2026 |
| Ledu Capital Ltd | Real estate | 2025 |
| LEE ANN Services Limited | Hospitality | 2025 |
| LEE Callan Ltd | Manufacturing | 2007 |
| LEE Greenslade Domestic and Commercial Heating Ltd | Construction | 2025 |
| LEE Xavier Legal Services Limited | Professional & scientific | 2020 |
| LEF Holdings Limited | Financial services | 2024 |
| Lefke Cafe Ltd | Hospitality | 2025 |
| LEG Words Limited | Professional & scientific | 2022 |
| Legendary Z Cleaning Ltd | Administrative & support | 2021 |
| Legis Consultancy Ltd | Wholesale & retail | 2021 |
| Legitimate Leadership INT Limited | Professional & scientific | 2020 |
| Leisure Design Projects Limited | Professional & scientific | 2019 |
| Leisureboy Industries Ltd | Health & social care | 2023 |
| Lelia Hairstylist Limited | Other services | 2025 |
| Lema Associates Ltd | Education | 2025 |
| Lemon Energy Ltd | Manufacturing | 2022 |
| Lena BTL Property Limited | Real estate | 2026 |
| Lendl Global Ltd | Arts & recreation | 2017 |
| Lenhart Partners Limited | Financial services | 2017 |
| Lennox and Radnor Houses Residents' Association Limited(The) | Real estate | 1966 |
| LEO and Shine Ltd | Arts & recreation | 2020 |
| Leon P. Marcus Limited | Administrative & support | 2025 |
| Leon Team Limited | Construction | 2012 |
| LES Oursons Ltd | Health & social care | 2025 |
| Let's ACT Drama Classes Limited | Education | 2013 |
| Let's Talk Better C.I.C. | Education | 2025 |
| Lethbridge Lines Limited | Manufacturing | 2005 |
| Letpro Ltd | Construction | 2022 |
| Lets GET Weird Ltd | Information & communication | 2025 |
| Letsrunwithit Limited | Professional & scientific | 2014 |
| Lett Road Management Company Limited | Households | 2010 |
| Letters by Julia Ltd | Arts & recreation | 2021 |
| Letz Select Limited | Real estate | 2014 |
| Letzone Property Limited | Real estate | 2003 |
| Leuman Property Investments Limited | Real estate | 2025 |
| Levande Residents Association Limited | Households | 2004 |
| Level UP Digital Company Ltd | Professional & scientific | 2024 |
| Levone Ltd | Wholesale & retail | 2019 |
| Lewis & Millie Ltd | Health & social care | 2018 |
| Lewis Duct Properties Limited | Real estate | 2017 |
| Lewis Ductclean Limited | Administrative & support | 2003 |
| Lewisham Butchers & Grocers Limited | Wholesale & retail | 1996 |
| Lewisham Mencap | Health & social care | 1998 |
| Lexa Investment Ltd | Real estate | 2026 |
| Leyla Maya Limited | Wholesale & retail | 2023 |
| Leylan Investments Limited | Real estate | 2024 |
| Leyvanni Integrated Services Ltd | Administrative & support | 2017 |
| LFG Property Management Ltd | Real estate | 2022 |
| LFL SPV 1 Ltd | Administrative & support | 2022 |
| LFM Global Limited | Professional & scientific | 2013 |
| LH Financial Limited | Professional & scientific | 2020 |
| LHA Property Holdings Ltd | Real estate | 2025 |
| Lhair Studio Ltd | Other services | 2024 |
| LHC Electrical Contractors Ltd | Construction | 2024 |
| Lia's Wings Limited | Transport & logistics | 2009 |
| Lianne Property Group Ltd | Real estate | 2023 |
| Liberatis Investments Limited | Financial services | 2020 |
| Libertas Infinita Trading Ltd | Wholesale & retail | 2025 |
| Libertas Partners Ltd | Wholesale & retail | 2016 |
| Liberte Law and Consultancy Limited | Professional & scientific | 2020 |
| Liberty and Franklin Management Company Ltd | Households | 2017 |
| Liberty Place Management Company Limited | Households | 2001 |
| Liberty Tuition Ltd | Education | 2017 |
| Lidc Investments Ltd | Real estate | 2025 |
| Lidc Ltd | Real estate | 2020 |
| Lidc Management Ltd | Households | 2025 |
| Liddell Graphics Ltd | Professional & scientific | 2012 |
| Lifestone Resources Ltd | Administrative & support | 2016 |
| Lifestyle Controls Limited | Construction | 2004 |
| Lifetime Pictures Ltd | Information & communication | 2024 |
| Lift X Consult Limited | Professional & scientific | 2025 |
| Liftesc Limited | Other services | 2018 |
| Light Blue Property Investments Limited | Real estate | 2025 |
| Lightbox Radiology Limited | Health & social care | 2019 |
| Lightguru's Ltd | Construction | 2019 |
| Ligwa Services Limited | Professional & scientific | 2025 |
| Likemo Ltd | Real estate | 2026 |
| Lila D UK Ltd | Hospitality | 2014 |
| Lilah Mews Management Company Limited | Households | 2003 |
| Lillys Kitchen Beckenham Limited | Hospitality | 2022 |
| Liloo BK Ltd | Wholesale & retail | 2024 |
| Lily and Joy London Ltd | Wholesale & retail | 2020 |
| Lily Selavie Gallery Ltd | Wholesale & retail | 2025 |
| Lima&Castro Ltd | Transport & logistics | 2022 |
| Limahs and Remo Limited | Households | 2006 |
| Lime Boulevard Limited | Households | 2012 |
| Limehouse London Limited | Hospitality | 2019 |
| Limelight Electrics (UK) Limited | Construction | 2009 |
| Limohawk Technologies Ltd | Information & communication | 2026 |
| Lincoln Lodge (Management) Limited | Households | 1981 |
| Linea Recruitment Ltd | Administrative & support | 2025 |
| Ling's Cabinet Ltd | Wholesale & retail | 2012 |
| Lingerham Properties Limited | Real estate | 1969 |
| Link ID Holdings Ltd | Real estate | 2024 |
| Link ID Ltd | Real estate | 2019 |
| Link ID Management Ltd | Real estate | 2023 |
| Linkdent Consultancy Ltd | Health & social care | 2021 |
| Linkestis Ltd | Construction | 2019 |
| Links Wholesale Ltd | Wholesale & retail | 2010 |