| LDG Plumbing & Heating Ltd | Construction | 2022 |
| LDM Building Ltd | Construction | 2025 |
| LDM Construct Limited | Construction | 2026 |
| LDM Uk-Property Ltd | Real estate | 2024 |
| LDN EPC Ltd | Professional & scientific | 2018 |
| LDN Movement Ltd | Education | 2018 |
| LDN Plates Ltd | Manufacturing | 2019 |
| LDN Studio Ltd | Professional & scientific | 2014 |
| LE Golden Touch Witham Ltd | Other services | 2021 |
| LE Investments SE Ltd | Extraterritorial | 2024 |
| LE Mirragge Nail Limited | Other services | 2022 |
| LEA Valley Heritage CIC | Information & communication | 2024 |
| LEA Valley Motor Co. Limited | Wholesale & retail | 2002 |
| Leadwork Roofing Supplies Ltd | Manufacturing | 2025 |
| Leaf Heat Ltd | Construction | 2020 |
| Leahmiz Limited | Health & social care | 2015 |
| Learn Hub Limited | Education | 2026 |
| Learning by Doing Limited | Construction | 2020 |
| Leawood Builders Limited | Other services | 1973 |
| Leboff and Solar International Ltd | Transport & logistics | 1966 |
| Lecelenza Limited | Construction | 2019 |
| Lecellenza Limited | Real estate | 2013 |
| Leckhampton Limited | Extraterritorial | 1997 |
| LED Youth Ltd | Education | 2024 |
| Leda Court Limited | Households | 2000 |
| Ledi UK Limited | Information & communication | 2018 |
| LEE Chapel Homes Ltd | Real estate | 2023 |
| LEE Industrial Limited | Wholesale & retail | 1976 |
| LEE Orthodontics Ltd | Health & social care | 2012 |
| LEE Valley Heat Network Operating Company Limited | Professional & scientific | 2015 |
| Leenraj IT Limited | Information & communication | 2020 |
| Leepee Property Limited | Construction | 2025 |
| Lefta Properties Ltd | Real estate | 2025 |
| Legacy Construction & Refurbishment Limited | Construction | 2025 |
| Legacy Empire Management Ltd | Real estate | 2025 |
| Legacy Industries Ltd | Financial services | 2025 |
| Legal Lilley Ltd | Professional & scientific | 2026 |
| Legal Right Services Ltd | Professional & scientific | 2018 |
| Legend the Barber Shop Ltd | Other services | 2013 |
| Legendata Ltd | Water & waste | 2021 |
| Legends Games Ltd | Administrative & support | 2024 |
| Lelia Maria DA Conceicao Gomes Ltd | Administrative & support | 2025 |
| Lellow and SON Ltd | Construction | 2026 |
| Lellybird Leisure Ltd | Arts & recreation | 2023 |
| Lemanski Contractors Ltd | Construction | 2011 |
| Lemon Greek Bakery Ltd | Hospitality | 2026 |
| Lendstride Limited | Financial services | 2025 |
| Lenehan Consulting Limited | Professional & scientific | 2024 |
| Lenex Corp Ltd | Wholesale & retail | 2026 |
| Lennys Aesthetics Ltd | Other services | 2018 |
| Leno Electrical Ltd | Construction | 2016 |
| Lenson Properties Ltd | Real estate | 2024 |
| Lenville Properties Limited | Real estate | 2006 |
| LEO Accident Repair Ltd | Wholesale & retail | 2024 |
| LEO EE Ltd | Construction | 2021 |
| LEO Pro Splash Ltd | Other services | 2020 |
| LEO Professionals Ltd | Construction | 2025 |
| LEO SAI Ltd | Real estate | 2021 |
| LEO Steele Limited | Administrative & support | 2019 |
| Leo's Bar & Kitchen Ltd | Other services | 2023 |
| Leo's Import Export and Trading Ltd | Manufacturing | 2014 |
| Leofix Ltd | Other services | 2025 |
| Leon Cons Ltd | Construction | 2018 |
| Leon Properties Ltd | Real estate | 2022 |
| Leons Damp Proofing Specialist Ltd | Construction | 2022 |
| Leora Global Limited | Wholesale & retail | 2025 |
| Leos Foods Limited | Wholesale & retail | 2020 |
| Leo’S Professional Painting & Decorating Ltd | Construction | 2024 |
| Leqsam Ltd | Construction | 2025 |
| Leqwa Limited | Other services | 2025 |
| Lespoir Nails Limited | Other services | 2019 |
| Less IS More Consulting Ltd | Professional & scientific | 2016 |
| LET Ready Limited | Real estate | 2020 |
| Let's Tailor Design Ltd | Professional & scientific | 2024 |
| Letberry Property Ltd | Real estate | 2019 |
| Lets Party and My Event Company Ltd | Other services | 2010 |
| Letssip Limited | Administrative & support | 2021 |
| Lett-Us Ltd | Real estate | 2026 |
| Levantiq Concepts Ltd | Hospitality | 2025 |
| Level Group Services UK Ltd | Administrative & support | 2019 |
| Level UP Dance Competition Ltd | Administrative & support | 2026 |
| Leveliko Property Commercial Investment Ltd | Real estate | 2025 |
| Levene Commercial & Surveyors Limited | Professional & scientific | 2011 |
| Levene Estates, Property & Brokerage Services Limited | Financial services | 2004 |
| Levene Property Consultants Limited | Professional & scientific | 2014 |
| Leventia Media Limited | Professional & scientific | 2006 |
| Leviathan London Ltd | Other services | 2013 |
| Lewes Land Ltd | Real estate | 2014 |
| LEX Guard Group Ltd | Administrative & support | 2025 |
| Lexgrove Limited | Real estate | 2019 |
| Lexivio Ltd | Administrative & support | 2026 |
| Lexmill Properties Limited | Real estate | 2014 |
| Lexturkey Limited | Professional & scientific | 2015 |
| Leyla 83 Limited | Hospitality | 2020 |
| Leyton Road Management Company Limited | Real estate | 2024 |
| Ley’S Skin Clinic Ltd | Other services | 2025 |
| LF Residential Lettings Ltd | Real estate | 2025 |
| LGC London Limited | Construction | 2022 |
| LGP Services Ltd | Construction | 2019 |
| LGR Construction Ltd | Construction | 2017 |