| Learna (Wolverhampton) Limited | Education | 2025 |
| Learna Holdings Limited | Education | 2021 |
| Learna Limited | Education | 2010 |
| Learnabout Ltd | Education | 2024 |
| Learner Metrics Ltd | Information & communication | 2022 |
| Learnifyx Limited | Professional & scientific | 2025 |
| Learning Ship Ltd | Professional & scientific | 2025 |
| Learning Software Limited | Education | 2019 |
| Learning Technical Co., Ltd | Administrative & support | 2019 |
| Learning With Jeevika Limited | Manufacturing | 2022 |
| LEARNING1314 Limited | Wholesale & retail | 2021 |
| Learnium Limited | Information & communication | 2013 |
| Learnloon Ltd | Education | 2025 |
| Learnovia Ltd | Education | 2025 |
| Learntaichiwell Limited | Wholesale & retail | 2025 |
| Learnvast Ltd | Education | 2025 |
| Leas Pavilion Development Ltd | Real estate | 2020 |
| Lease Return Limited | Wholesale & retail | 2019 |
| Leasehold and Freehold Reform 2024 Limited | Professional & scientific | 2009 |
| Leasehold Rights Limited | Extraterritorial | 2021 |
| Leasesure Property Ltd | Real estate | 2024 |
| Leash on Leads Ltd | Other services | 2025 |
| Leathana Limited | Manufacturing | 2025 |
| Leather Academy Ltd | Other services | 2026 |
| Leather Rock Ltd | Wholesale & retail | 2025 |
| Leathorpe Limited | Wholesale & retail | 2016 |
| Leave IT to Esmie Limited | Hospitality | 2016 |
| Leavelite Limited | Arts & recreation | 1977 |
| Lebanese Grill London Limited | Real estate | 2014 |
| Lebanese Wrap House Limited | Hospitality | 2016 |
| Lebar-Hill Investments Limited | Professional & scientific | 2020 |
| Lebensbaum Ltd | Extraterritorial | 2020 |
| Leblanc Retail PC | | 2016 |
| Lecaj Properties Ltd | Real estate | 2025 |
| Lech Group Limited | Wholesale & retail | 2025 |
| Leck Health Limited | Health & social care | 2022 |
| LECK135 Ltd | Manufacturing | 2016 |
| Leckrid Ltd | Information & communication | 2022 |
| Lectroheat Holdings Limited | Financial services | 2015 |
| Ledgerup CIC | Administrative & support | 2025 |
| Ledidihfe Trading Ltd | Wholesale & retail | 2025 |
| LEE & LEE Consultants Ltd | Professional & scientific | 2019 |
| LEE and Turner Limited | Wholesale & retail | 1989 |
| LEE Asphalt Ltd | Construction | 2013 |
| LEE Close Management Company Limited | Households | 1982 |
| LEE James Limited | Administrative & support | 2018 |
| LEE KEE Limited | Wholesale & retail | 2026 |
| LEE Petulengro Limited | Professional & scientific | 2025 |
| LEE Stuart Photography Limited | Professional & scientific | 2015 |
| LEE Wakemans Limited | Construction | 2009 |
| LEE Williams Contractors Limited | Construction | 2023 |
| Lee's Chinese Limited | Hospitality | 2019 |
| Leea Health Limited | Health & social care | 2014 |
| Leebon Limited | Wholesale & retail | 2025 |
| Leed Consultancy Limited | Professional & scientific | 2015 |
| Leedan Capital Management Ltd | Construction | 2021 |
| Leedavycoaching Ltd | Education | 2024 |
| Leeds and Lansdowne Limited | Financial services | 2018 |
| Leeds Builders Ltd | Construction | 2024 |
| Leeds Properties (UK) Limited | Construction | 2002 |
| Leegends Ltd | Wholesale & retail | 2025 |
| Leejutech Ltd | Wholesale & retail | 2025 |
| Leeke & Terry Investments Limited | Construction | 2014 |
| Leeksons Exterior Cleaning Limited | Administrative & support | 2016 |
| Leeleebeam Limited | Wholesale & retail | 2020 |
| Leemeya UK Ltd | Professional & scientific | 2016 |
| Leen Fashion Company Limited | Professional & scientific | 2011 |
| Leeswa Ltd | Wholesale & retail | 2022 |
| Leet Projects Ltd | Information & communication | 2019 |
| Leetek Limited | Information & communication | 1998 |
| Leevan's Solutions Ltd | Administrative & support | 2021 |
| Leezaim Consulting Ltd | Financial services | 2016 |
| Lefen Industry Co., Ltd. | Administrative & support | 2022 |
| Lefert Consulting Limited | Education | 2020 |
| Lefevre Group Ltd | Administrative & support | 2016 |
| Leff Business Ltd | Professional & scientific | 2018 |
| Left Films Ltd | Information & communication | 2009 |
| Left Holdings Ltd | Financial services | 2025 |
| Left Right Circle Company Limited | Construction | 2023 |
| Leftway Limited | Hospitality | 2024 |
| LEG UP Trader Ltd | Education | 2023 |
| Legacy Coaching Group Limited | Professional & scientific | 2018 |
| Legacy Developments North West Ltd | Construction | 2020 |
| Legacy Elite Ltd | Wholesale & retail | 2025 |
| Legacy Estates Group Ltd | Real estate | 2025 |
| Legacy Junk Journal Ltd | Wholesale & retail | 2026 |
| Legacy Motor & Asset Ltd | Wholesale & retail | 2026 |
| Legacy Moulding Solutions Ltd | Manufacturing | 2025 |
| Legacy Property Ventures Ltd | Wholesale & retail | 2019 |
| Legal Advice W. Ltd | Professional & scientific | 2015 |
| Legal and License Compliance Services Limited | Professional & scientific | 2024 |
| Legal ARM Limited | Professional & scientific | 2018 |
| Legal Compliance Manager Limited | Professional & scientific | 2014 |
| Legal FEE Refund Ltd | Professional & scientific | 2019 |
| Legal International Nexus Corporation Limited | Real estate | 2017 |
| Legal Ledgers Limited | Professional & scientific | 2016 |
| Legal Needs Limited | Professional & scientific | 2008 |
| Legal Sphere Technologies Ltd | Administrative & support | 2018 |
| Legal UK Services Ltd | Professional & scientific | 2016 |
| Legalitify Ltd | Information & communication | 2025 |