| Legacy Growth Investments Ltd | Real estate | 2023 |
| Legacy of SID Ltd. | Professional & scientific | 2017 |
| Legacy Value Ltd | Professional & scientific | 2025 |
| Legal Forensic Limited | Professional & scientific | 2018 |
| Legal Lists Ltd | Information & communication | 2025 |
| Legal Services on Demand Limited | Information & communication | 2024 |
| Legalcv Limited | Construction | 2025 |
| Legendary Ventures Ltd | Wholesale & retail | 2026 |
| Legguk Limited | Professional & scientific | 2021 |
| Legion Comps Ltd | Wholesale & retail | 2026 |
| Leicester Homecare Ltd | Health & social care | 2025 |
| Leigh and Sons Cleaning Services Ltd | Administrative & support | 2020 |
| Lein Holdings Limited | Financial services | 2024 |
| Leiston Investments Limited | Real estate | 2009 |
| Leisure-Tek (East Anglia) Limited | Arts & recreation | 2003 |
| LEJ Sports Limited | Wholesale & retail | 2023 |
| Lels Counselling CIC | Administrative & support | 2020 |
| Lemeve Ltd | Wholesale & retail | 2025 |
| Lemmata Limited | Information & communication | 2008 |
| Lemon & Lime Management Ltd | Construction | 2017 |
| Lemon Ginger Consulting Limited | Information & communication | 2015 |
| Lemon Raja Ltd | Wholesale & retail | 2025 |
| Lench Fold Wealth Management Limited | Financial services | 2025 |
| Lendbridge Limited | Hospitality | 2021 |
| Leneration Limited | Real estate | 1971 |
| Lennie Builders Limited | Construction | 2025 |
| Lenox Consultancy Ltd | Professional & scientific | 2023 |
| Lenox Property Ltd | Real estate | 2025 |
| Lentfertstaete Ltd | Other services | 2010 |
| LEO Boss Business Ltd | Transport & logistics | 2011 |
| LEO Curtis Ltd | Real estate | 2026 |
| LEO Fortune Global Ltd | Wholesale & retail | 2025 |
| LEO Fortune Limited | Information & communication | 2017 |
| Leon Dexter Mervyn Roberts Limited | Extraterritorial | 2025 |
| Leono Global Ltd | Wholesale & retail | 2024 |
| Leopard Property Developments Limited | Real estate | 2025 |
| Leopardi Ltd | Hospitality | 2010 |
| Leopards Coffee Ltd | Wholesale & retail | 2024 |
| Leorenjer Foods Ltd | Manufacturing | 2025 |
| Leporarius Ltd | Health & social care | 2025 |
| Lepoxy Ltd | Wholesale & retail | 2025 |
| LES Renardes Limited | Real estate | 2020 |
| Leshika News Agent Limited | Wholesale & retail | 2019 |
| Leslie Flint Educational Trust Limited | Information & communication | 1997 |
| Lestial Ltd | Information & communication | 2023 |
| Lestrange Carpentry and Building Ltd | Construction | 2023 |
| Let's Catch UP Ltd | Other services | 2025 |
| Let's Go Beautiful Ltd | Professional & scientific | 2024 |
| Let's Go Pro Ltd | Manufacturing | 2024 |
| Letmatch Ltd | Information & communication | 2010 |
| Letob Ltd | Health & social care | 2021 |
| Letsverify Ltd | Professional & scientific | 2025 |
| Letting Go Labs Ltd | Information & communication | 2024 |
| Lettspartyuk Ltd | Administrative & support | 2023 |
| Levant Cafe Ltd | Hospitality | 2026 |
| Levanta Partners Ltd | Professional & scientific | 2025 |
| Levantia UK Ltd | Wholesale & retail | 2023 |
| Levelise Limited | Information & communication | 2017 |
| Levelnorth Ltd | Professional & scientific | 2009 |
| Leverage on Heroes Creations Ltd | Wholesale & retail | 2025 |
| Levuroy Ltd | Wholesale & retail | 2025 |
| Levyx Limited | Wholesale & retail | 2019 |
| Lewis Wilson Hair Ltd | Other services | 2025 |
| Lewisham Education Group CIC | Education | 2025 |
| LEX Auto Care Limited | Wholesale & retail | 2024 |
| LEX ET Ratio Ltd | Professional & scientific | 2025 |
| LEX Solutions Global Ltd | Wholesale & retail | 2025 |
| LEX Squared Ltd | Administrative & support | 2021 |
| Lexantha Capital Limited | Administrative & support | 2004 |
| Lexcore Consulting Ltd | Professional & scientific | 2025 |
| Lexgreen Services Limited | Construction | 1996 |
| Lexify Languages Ltd | Education | 2026 |
| Lexvio Limited | Wholesale & retail | 2025 |
| LFL Events Ltd | Arts & recreation | 2024 |
| LFT Network Ltd | Professional & scientific | 2025 |
| LGP Property Ltd | Real estate | 2024 |
| LH Property Ventures Ltd | Extraterritorial | 2025 |
| LHA Build Ltd | Construction | 2025 |
| LHC Franchises Ltd | Administrative & support | 2025 |
| Lhln Design Ltd | Professional & scientific | 2025 |
| LHS Development Limited | Information & communication | 2015 |
| LIA Contractors Ltd | Construction | 2019 |
| LIA Investment Properties Ltd | Real estate | 2026 |
| Liakada Kitchens Ltd | Professional & scientific | 2022 |
| Liam Reynolds Trading Ltd | Professional & scientific | 2020 |
| Liangzijiyuan Ltd | Wholesale & retail | 2025 |
| Lianthurium Ltd | Wholesale & retail | 2025 |
| Libation Liberation Limited | Manufacturing | 2015 |
| Liberation Sound System Ltd | Administrative & support | 2026 |
| Libertas Property Limited | Real estate | 2021 |
| Libertatem Eligendi Ltd | Administrative & support | 2010 |
| Lichan Ltd | Real estate | 2020 |
| Lidell Building & Construction Limited | Professional & scientific | 2006 |
| Lidwells Ltd | Health & social care | 2009 |
| Life Essence Global Ministries Community Interest Company | Public administration | 2019 |
| Life EXP Ltd | Professional & scientific | 2025 |
| Life Lessons Training UK Ltd | Administrative & support | 2025 |
| Life Skills Rotherham Limited | Hospitality | 2019 |
| Life Tune Health Limited | Health & social care | 2024 |
| Life's Digital Limited | Professional & scientific | 2025 |