| L.A.S. Medicals Ltd | Health & social care | 2023 |
| L.E.W. Scaffolding Limited | Construction | 2010 |
| L23 LFH Ltd | Wholesale & retail | 2022 |
| LA Bonne VIE Kreolia Ltd | Hospitality | 2019 |
| LA Power Ltd | Households | 2017 |
| Laad Investment Ltd | Real estate | 2024 |
| Laad Properties Limited | Real estate | 2024 |
| Labriz UK Imports&Exports Limited | Wholesale & retail | 2020 |
| Lace and Button Ltd | Wholesale & retail | 2020 |
| Laila Estate Ltd | Real estate | 2020 |
| Lakefront Stones Limited | Financial services | 2026 |
| Lakhvinder Singh Contractor Ltd | Construction | 2018 |
| LAL Hardy INK Limited | Arts & recreation | 2011 |
| Lall Development Ltd | Real estate | 2021 |
| Lall Land Investments Ltd | Construction | 2022 |
| Lama Group (London) Limited | Real estate | 2025 |
| Lamkikas Ltd | Wholesale & retail | 2021 |
| Lamptarget Limited | Real estate | 2006 |
| Land Reegen Limited | Water & waste | 2019 |
| Landmark Facilities Management Consultancy Limited | Professional & scientific | 2000 |
| Langa Solutions Limited | Professional & scientific | 2020 |
| Langdale and Westerley Court RTM Company Limited | Hospitality | 2011 |
| Lankasri Limited | Professional & scientific | 2010 |
| Larchwood Roofing & Building Limited | Construction | 2012 |
| Larkspur Recruitment Ltd | Administrative & support | 2025 |
| Larryanprojects Ltd | Construction | 2023 |
| Lasab Cyber Security Ltd | Professional & scientific | 2022 |
| Lasab Property Lettings Ltd | Real estate | 2023 |
| Lash Pro Ltd | Administrative & support | 2018 |
| Lashious Ealing Limited | Other services | 2013 |
| Last Rose Ltd | Hospitality | 2016 |
| Latina Financial Services Limited | Professional & scientific | 2012 |
| Laura Harman Physio Ltd | Health & social care | 2012 |
| Lauren Scott Illustration Ltd | Arts & recreation | 2022 |
| Lava Inc Ltd | Wholesale & retail | 2025 |
| Lawn Complete Ltd | Administrative & support | 2015 |
| Lawrence Landscapes Ltd | Administrative & support | 2018 |
| Lawrence Moody Business Law Limited | Professional & scientific | 2024 |
| Lawrence Rand Limited | Real estate | 2006 |
| Laxmi BNS Holdings Limited | Manufacturing | 2010 |
| Laxmico Limited | Wholesale & retail | 2009 |
| Laymac Construction Ltd | Administrative & support | 2024 |
| LAZ RAD Ltd | Health & social care | 2019 |
| LCM Fires Limited | Construction | 2014 |
| LDM Roofing & Guttering Services Ltd | Construction | 2020 |
| LDT Plastering Limited | Construction | 2018 |
| LE KUI Building Materials Co., Ltd. | Administrative & support | 2020 |
| Lead With TAN Ltd | Administrative & support | 2025 |
| Leader Property Solutions Ltd | Real estate | 2025 |
| Leader Removals London Ltd | Transport & logistics | 2019 |
| Leader Removals Ltd | Transport & logistics | 2015 |
| Leadjust Daily USE Products Co., Ltd | Extraterritorial | 2016 |
| Leamington Crescent Limited | Real estate | 2025 |
| Leamington Lettings Ltd | Real estate | 2015 |
| Lean Lioness Ltd | Administrative & support | 2026 |
| Lean on ME Counselling Limited | Health & social care | 2020 |
| Learn 2 Survive + Thrive Ltd | Professional & scientific | 2021 |
| LEE Road Limited | Real estate | 2018 |
| LEE Road Property Ltd | Real estate | 2018 |
| Leebuks Limited | Professional & scientific | 2010 |
| Leeds International College Limited | Education | 2019 |
| Legal Print Services Ltd | Administrative & support | 2019 |
| Legalmaster Ltd | Information & communication | 2025 |
| Leighton Consultancy and Contracting Limited | Construction | 2019 |
| Leisurewise Limited | Arts & recreation | 2022 |
| Leitrim Consulting Limited | Professional & scientific | 2019 |
| Len's Property & Management Ltd | Transport & logistics | 2026 |
| Len's Roofing & Building Services Ltd | Construction | 2021 |
| Lenix Services Limited | Wholesale & retail | 2005 |
| Lens Roofing & Guttering Services Ltd | Construction | 2026 |
| Leon Taekwondo Academy Ltd | Arts & recreation | 2021 |
| Leporce Limited | Wholesale & retail | 2020 |
| Lese & Lista Ltd | Manufacturing | 2018 |
| Letts Direct (UK) Ltd | Real estate | 2008 |
| Letz Rent Properties Limited | Real estate | 2022 |
| Leuqcar Limited | Administrative & support | 2025 |
| Level 99 Lifestyle Ltd | Real estate | 2017 |
| Levitin Music Solutions Limited | Wholesale & retail | 2017 |
| Lewis Management Services Ltd | Professional & scientific | 2024 |
| Lexington Global Holdings Management Ltd | Real estate | 2019 |
| Lexx Drylining Ltd | Construction | 2025 |
| Leyton Point Limited | Real estate | 2018 |
| Lglm Property Lettings Ltd | Real estate | 2021 |
| LHM Investments Limited | Households | 2017 |
| Liam B Mcneil Ltd | Professional & scientific | 2021 |
| LIBER8DESIGN Ltd | Professional & scientific | 2018 |
| Libraway Limited | Health & social care | 2019 |
| Librentez Ltd | Wholesale & retail | 2020 |
| Lido Services Ltd | Other services | 2015 |
| Lightpro Limited | Construction | 2001 |
| Lightyear Pictures Limited | Professional & scientific | 2023 |
| Lilena Gold Limited | Professional & scientific | 2012 |
| Liley Limited | Wholesale & retail | 2019 |
| Lilly Estates PK Ltd | Real estate | 2025 |
| Lilly Rose Estates Ltd | Real estate | 2025 |
| Lilyvalley London Ltd | Wholesale & retail | 2020 |
| Lime & Lime Ltd | Professional & scientific | 2012 |
| Lime Street London Limited | Real estate | 2017 |
| Limelight DRY Cleaner Ltd | Wholesale & retail | 2022 |
| Limotak Pro Ltd | Transport & logistics | 2023 |