| Lebern Limited | Real estate | 2013 |
| Lebern Support Services Limited | Health & social care | 2021 |
| Lebupani Ltd | Health & social care | 2025 |
| LED FAB Ltd | Administrative & support | 2022 |
| Ledger Services (UK) Limited | Professional & scientific | 2012 |
| Ledgertax Limited | Professional & scientific | 2025 |
| Ledion Construction Ltd | Construction | 2025 |
| Ledoir Ltd | Wholesale & retail | 2022 |
| Ledoir Residences Limited | Hospitality | 2025 |
| LEE Engineers and Co Limited | Real estate | 2011 |
| Leftyyomm Limited | Other services | 2019 |
| Legacy Gardens Debden Limited | Real estate | 2026 |
| Legacy Property Management Ltd | Real estate | 2001 |
| Legacy Wharf Limited | Real estate | 2021 |
| Legal Boost Ltd | Education | 2024 |
| Legal Direct INT Limited | Professional & scientific | 2023 |
| Legal Directory Ltd | Professional & scientific | 2013 |
| Legal Doctors Limited | Real estate | 2011 |
| Legal Inn Ltd | Professional & scientific | 2024 |
| Legal Pathway Ltd | Professional & scientific | 2017 |
| Legal Title Registrations Limited | Construction | 1993 |
| Legal Way Limited | Professional & scientific | 2025 |
| Legalex Global Consultants Ltd | Professional & scientific | 2018 |
| Legalidy Ltd | Professional & scientific | 2025 |
| Legendary Cleaners Ltd | Administrative & support | 2024 |
| Legendary Construction Ltd | Construction | 2019 |
| Leghari Traders Limited | Wholesale & retail | 2021 |
| Legist Immigration Solutions Ltd | Professional & scientific | 2013 |
| Legix Solutions Limited | Professional & scientific | 2026 |
| Leicester Medical Limited | Real estate | 2007 |
| Leinster Limited | Real estate | 2025 |
| Lekky Group Ltd | Construction | 2020 |
| Leksh Solutions Limited | Professional & scientific | 2006 |
| Lelito Construction Ltd | Construction | 2017 |
| Lelo Health Ltd | Health & social care | 2022 |
| Leman Drycleaners Limited | Other services | 2017 |
| Lemar Bargain Ltd | Wholesale & retail | 2021 |
| Lemon & Soda UK Ltd | Wholesale & retail | 2024 |
| Lemon Gardens Entertainment Ltd | Hospitality | 2016 |
| Lemon Pips - Poetry in Pictures Ltd | Arts & recreation | 2012 |
| Lemuria Foods Ltd | Wholesale & retail | 2020 |
| Lemyn Ltd | Construction | 2025 |
| Lemzchy Global Ltd | Health & social care | 2022 |
| Lenai London Ltd | Other services | 2025 |
| Lencroft Limited | Administrative & support | 2008 |
| Lender's Corner Ltd | Financial services | 2022 |
| Lendesk Limited | Financial services | 2018 |
| LEO Alfie Transport Ltd | Transport & logistics | 2024 |
| LEO Consultancy & Training Ltd | Professional & scientific | 2019 |
| LEO Executive Chauffeurs Ltd | Transport & logistics | 2023 |
| LEO Gravity Ltd | Information & communication | 2025 |
| Leokyn Ltd | Wholesale & retail | 2025 |
| Leon Anthony Gruber Ltd | Extraterritorial | 2023 |
| Leon Estates & Management Ltd | Real estate | 2021 |
| Leon Guarding & FM Limited | Administrative & support | 2016 |
| Leon Healthcare Limited | Health & social care | 2025 |
| Leopard Security Services Ltd | Administrative & support | 2018 |
| Leopold Naessens Ltd | Other services | 2021 |
| Lepus AP Limited | Hospitality | 2024 |
| Lepus AQ Limited | Hospitality | 2024 |
| Lepus PY Limited | Wholesale & retail | 2024 |
| LES Maisons Limited | Real estate | 2022 |
| Leslieess Ltd | Other services | 2015 |
| LET Britain International Group Limited | Real estate | 2015 |
| LET ME Learn Ltd | Education | 2025 |
| LET to Live Ltd | Real estate | 2021 |
| Let's Colaborate Limited | Wholesale & retail | 2023 |
| Lethish and Brothers UK Ltd | Wholesale & retail | 2025 |
| Letora Ltd | Hospitality | 2025 |
| Lets GET Real Estate Ltd | Real estate | 2016 |
| Lets Plan Needs Limited | Information & communication | 2025 |
| Letting International Limited | Real estate | 1997 |
| Lettis Solutions Ltd | Construction | 2025 |
| Letworth Estates Limited | Real estate | 2022 |
| Leug Limited | Wholesale & retail | 2020 |
| Level 1 Virtual Solutions Limited | Information & communication | 2011 |
| Level Bridge Investments Ltd | Real estate | 2026 |
| Level Link Limited | Health & social care | 2008 |
| Level UP Labour Ltd | Other services | 2025 |
| Levels Hospitality and Management Limited | Construction | 2024 |
| Leventech Limited | Wholesale & retail | 2011 |
| Leventz Ltd | Administrative & support | 2023 |
| Levqor Ltd | Information & communication | 2025 |
| Levstrans Ltd | Transport & logistics | 2024 |
| Lewis Quality Landscaping Ltd | Administrative & support | 2025 |
| LEX Blinds Ltd | Wholesale & retail | 2013 |
| Lexbury Limited | Real estate | 2017 |
| Lexden Court Management Company Limited | Real estate | 2006 |
| Lexington Property Services Ltd | Real estate | 2023 |
| Lexu Drylining Limited | Construction | 2018 |
| LEY Street Barbers Ltd | Other services | 2024 |
| LEY Street Cafe Bar Ltd | Hospitality | 2025 |
| LEY Street Car Wash Ltd | Other services | 2022 |
| LEY Street Developments Ltd | Real estate | 2025 |
| LEY Street Food & Wine Ltd | Extraterritorial | 2020 |
| LEY Street Fresh Fish Ltd | Wholesale & retail | 2020 |
| LEY Street Ltd | Real estate | 2023 |
| LEY Street Management Ltd | Real estate | 2025 |
| Leyabelle Event Catering Ltd | Hospitality | 2013 |
| Leys Local Ltd | Wholesale & retail | 2019 |