| LEA Technologies Ltd | Information & communication | 2026 |
| Leaders in Training CIC | Professional & scientific | 2026 |
| Leading Essentials Ltd | Information & communication | 2022 |
| Leading Luton Cohort CIC | Health & social care | 2026 |
| Leaf and Bowl Ltd | Hospitality | 2025 |
| Leagrave Construction Ltd | Construction | 2024 |
| Leagrave Consulting Limited | Professional & scientific | 2022 |
| Leagrave Health Limited | Wholesale & retail | 2013 |
| Leagrave Heating Supplies Limited | Wholesale & retail | 1990 |
| Leagrave Lodge Ltd | Real estate | 2016 |
| Leagrave MOT Centre Ltd | Wholesale & retail | 2009 |
| Leagrave Nails & Spa Ltd | Other services | 2025 |
| Leagrave Nails Ltd | Other services | 2025 |
| Leagrave Property Limited | Real estate | 2018 |
| Leagrave Store Ltd | Wholesale & retail | 2025 |
| Leagrave Transport Ltd | Wholesale & retail | 2010 |
| Leagrave Waste Disposal Limited | Water & waste | 2022 |
| Leanmax Ltd | Real estate | 2024 |
| Learners Point Ltd | Education | 2020 |
| Learning for Progress Ltd | Wholesale & retail | 2021 |
| Learning Tools Ltd. | Information & communication | 2025 |
| Learnodrive Ltd | Education | 2025 |
| Leaside Events Ltd | Hospitality | 2025 |
| Leather Right UK Ltd | Wholesale & retail | 2023 |
| Leaves of Clean Ltd | Wholesale & retail | 2024 |
| Leaways Removals & Storage Limited | Transport & logistics | 2025 |
| Lebanese Grill House Limited | Hospitality | 2021 |
| Lecc Limited | Construction | 2014 |
| Leckey Property Services Ltd | Other services | 2025 |
| Ledio Ltd | Real estate | 2021 |
| LEE Global Venture Ltd | Wholesale & retail | 2026 |
| LEE Valley Doggie Day Care Limited | Other services | 2018 |
| Leela's Consulting Limited | Information & communication | 2015 |
| Leemrailtransport Limited | Transport & logistics | 2018 |
| Leems Solutions Limited | Wholesale & retail | 2018 |
| Leenk Ltd | Wholesale & retail | 2022 |
| Lega Transportation Ltd | Transport & logistics | 2025 |
| Legacy Furniture and Carpets Limited | Wholesale & retail | 2026 |
| Legacy Group Holdings Ltd | Real estate | 2026 |
| Legacy IT Solutions Ltd | Information & communication | 2026 |
| Legacy Ledgers Limited | Professional & scientific | 2024 |
| Legal & Risk Compliance Ltd | Administrative & support | 2013 |
| Legal Advice Hub CIC | Education | 2024 |
| Legal and Risk Management Services Limited | Professional & scientific | 2018 |
| Legal Finance Inheritance Consultants Ltd | Wholesale & retail | 2020 |
| Legalise IT Ltd | Administrative & support | 2024 |
| Legalize IT Limited | Administrative & support | 2025 |
| Legaload Ltd | Transport & logistics | 2017 |
| Legend Integrated Care Ltd | Health & social care | 2019 |
| Legendary Window Cleaning Services Ltd | Administrative & support | 2020 |
| Legends MMA Ltd | Arts & recreation | 2024 |
| Legešee Consulting Services Ltd | Professional & scientific | 2024 |
| Leggero Limited | Administrative & support | 2025 |
| Leicester Homes Ltd | Real estate | 2019 |
| Leiston Stores Ltd | Wholesale & retail | 2012 |
| Leka Foods Ltd | Wholesale & retail | 2016 |
| Leka Groundwork Ltd | Construction | 2024 |
| Lele Foods Ltd | Hospitality | 2023 |
| Lemon Crispy Chicken & Pizza Ltd | Hospitality | 2025 |
| Lemurian Watt Engineering Limited | Professional & scientific | 2025 |
| Lennina Ofori Ltd | Other services | 2021 |
| Lenoviz Limited | Information & communication | 2025 |
| Lenp UK Pictures Limited | Information & communication | 2022 |
| Lenré Wells Agency Limited | Administrative & support | 2022 |
| Lenscrete Limited | Manufacturing | 2010 |
| LEO Cubs Nursery Limited | Education | 2013 |
| LEO GJ Properties Ltd | Real estate | 2025 |
| LEO Luton Club Ltd | Arts & recreation | 2026 |
| LEO1991 Ltd | Transport & logistics | 2019 |
| Leonardo’S Empire Couriers Ltd | Transport & logistics | 2023 |
| Leonards Carpentry Ltd | Construction | 2015 |
| Leopard EYE Limited | Wholesale & retail | 2023 |
| Leopard Legal and Construction Limited | Administrative & support | 2023 |
| Leopard Legal Ltd | Administrative & support | 2025 |
| Leopard Legal Properties Ltd | Real estate | 2023 |
| Leoveanu Ltd | Transport & logistics | 2025 |
| Lerom Limited | Construction | 2019 |
| LES Délices DE Ghislaine Ltd | Manufacturing | 2024 |
| Lesball Ltd | Professional & scientific | 2012 |
| Lestarre Limited | Other services | 2016 |
| LET ME LET Ltd | Real estate | 2022 |
| LET Them EAT Cake Ltd | Other services | 2025 |
| LET Your Party Glow Ltd | Other services | 2022 |
| Lets Contracts Ltd | Construction | 2024 |
| Letwell Property Group Ltd | Real estate | 2026 |
| Letz Clean Ltd | Administrative & support | 2025 |
| Levant Choice UK Ltd | Manufacturing | 2023 |
| Levantine Bakery Ltd | Manufacturing | 2022 |
| Level Fifty Marketing Limited | Professional & scientific | 2023 |
| Levello Systems Limited | Manufacturing | 2025 |
| Levi Locums Ltd | Wholesale & retail | 2018 |
| Levint Cars Ltd | Wholesale & retail | 2018 |
| Leviton Investments Ltd | Real estate | 2025 |
| Levson Properties Limited | Real estate | 2025 |
| Lew's Little Soft Play Café and Community Hub CIC | Other services | 2024 |
| Lewis Brothers Carpentry Limited | Construction | 2025 |
| Lewis Strong Ltd | Real estate | 2024 |
| Lewis-Simpson Investment Group Ltd | Financial services | 2024 |
| Lewsey Christian Centre | Education | 2009 |
| Lewsey Farm Learning Centre | Education | 2002 |