| Lucilia Property Investment Limited | Real estate | 2020 |
| Lucio Trans Ltd | Transport & logistics | 2019 |
| Luckalex Support Ltd | Health & social care | 2023 |
| Lucky & Bamba Limited | Information & communication | 2022 |
| Lucky Bamboo Kitchen Ltd | Hospitality | 2025 |
| Lucky House LUC Ltd | Hospitality | 2026 |
| Lucky Jacks Leisure Ltd | Hospitality | 2025 |
| Lucky Jade Classnet Limited | Hospitality | 2025 |
| Lucky Jewelry Ltd | Wholesale & retail | 2024 |
| Lucky Labs LP | | 2021 |
| Lucky Star Noodle Ltd | Hospitality | 2025 |
| Lucubration Ltd | Public administration | 2021 |
| Lucy Frank Garden Construction Ltd | Administrative & support | 2024 |
| Lucy Frank Garden Design & Landscaping Limited | Administrative & support | 2017 |
| Lucy Jane Limited | Professional & scientific | 2025 |
| Lucy LOU Limited | Wholesale & retail | 2003 |
| Lucy Maggie Designs Limited | Arts & recreation | 2019 |
| Lucy Moran Ltd | Health & social care | 2023 |
| Lucy Nails 4568 Ltd | Other services | 2025 |
| Lucy Parker Limited | Arts & recreation | 2025 |
| Ludlow BIO Energy Holdings Ltd | Financial services | 2020 |
| Ludlow BIO Energy Ltd | Energy | 2013 |
| Ludo Worldwide Ltd. | Professional & scientific | 2023 |
| Ludob Limited | Extraterritorial | 2012 |
| Lufi Limited | Professional & scientific | 2016 |
| Lufrans Limited | Transport & logistics | 2012 |
| Luga Electrical Ltd | Construction | 2021 |
| LUI Design & Consultancy Ltd | Wholesale & retail | 2019 |
| Luigis Takeaway Ltd | Hospitality | 2018 |
| Luis F Vasquez Health and Wellness Ltd | Wholesale & retail | 2025 |
| Luisa Ltd | Real estate | 2019 |
| Lujo-Lettings Limited | Real estate | 2025 |
| Lukas Health & Safety and Environmental Training and Consultancy Limited | Professional & scientific | 2019 |
| Lukasz Siarek Ltd | Transport & logistics | 2018 |
| Lukasz Zadrozny Trans Ltd | Transport & logistics | 2023 |
| Luke Cummins Photography Ltd | Professional & scientific | 2026 |
| Luke Rental Properties Limited | Real estate | 2026 |
| Luke's Care Limited | Health & social care | 2025 |
| Lukedutch Ltd | Information & communication | 2021 |
| LUKELIZ2000 Ltd | Health & social care | 2023 |
| Lukkii Ltd | Wholesale & retail | 2022 |
| Lule Coffee Ltd | Wholesale & retail | 2024 |
| Lulus Eyelashes Ltd | Other services | 2017 |
| Lulworth Design Limited | Professional & scientific | 2020 |
| Lulworth Developments (NW) Limited | Real estate | 2023 |
| Luma Enterprise Ltd | Professional & scientific | 2024 |
| Luma Futures Limited | Health & social care | 2025 |
| Luma Laser and Beauty Ltd | Other services | 2021 |
| Luma London Limited | Administrative & support | 2022 |
| Luma Padel Limited | Arts & recreation | 2026 |
| Luma's Store Limited | Wholesale & retail | 2023 |
| Lumasands Limited | Wholesale & retail | 2026 |
| Lumavu Limited | Construction | 2019 |
| Lume Property Group Ltd | Real estate | 2025 |
| Lumen Arcade Limited | Information & communication | 2025 |
| Lumen Childcare (Everton) Ltd | Health & social care | 2026 |
| Lumen Childcare Group Ltd | Health & social care | 2026 |
| Lumen Procurement Ltd | Wholesale & retail | 2025 |
| Lumi Claws Studio Ltd | Manufacturing | 2025 |
| Lumie Studios Ltd | Other services | 2025 |
| Lumiere International Ltd | Wholesale & retail | 2026 |
| Lumina Digital Media Ltd | Professional & scientific | 2025 |
| Lumina Synergy Solutions Ltd | Education | 2025 |
| Luminara Collective CIC | Health & social care | 2025 |
| Luminary Finance LLP | | 2006 |
| Luminiouspath Limited | Wholesale & retail | 2026 |
| Luminous Fragrances Ltd | Wholesale & retail | 2025 |
| Luminous Ltd | Hospitality | 2024 |
| Lumintix Solutions Limited | Information & communication | 2025 |
| Lumivita Limited | Wholesale & retail | 2025 |
| Lumivive Ltd | Wholesale & retail | 2023 |
| Lumière at Home Limited | Information & communication | 2020 |
| Lumti Investments Limited | Financial services | 2023 |
| Lumti Solutions Limited | Professional & scientific | 2021 |
| Luna & Wave Ltd | Hospitality | 2025 |
| Luna Bathrooms Ltd | Construction | 2020 |
| Luna Craze Retail Ltd | Wholesale & retail | 2025 |
| Luna Growth Investment Ltd | Financial services | 2024 |
| Luna Hair and Beauty Salon Ltd | Other services | 2022 |
| Luna Kennels Ltd | Hospitality | 2022 |
| Luna Llena Properties Ltd | Real estate | 2022 |
| Luna Music Ltd | Information & communication | 2024 |
| Luna Realty Holdings Limited | Real estate | 2025 |
| Luna Signalling Ltd | Construction | 2021 |
| Lunar Audio Limited | Manufacturing | 2024 |
| Lunar Ballet Company Limited | Arts & recreation | 2019 |
| Lunar Care Limited | Administrative & support | 2024 |
| Lunar Rituals Ltd | Wholesale & retail | 2020 |
| Lunar Rose Limited | Professional & scientific | 2019 |
| Lunari Holdings Limited | Financial services | 2025 |
| Lunarnie Ltd | Real estate | 2024 |
| Lunch Hour Catering Limited | Hospitality | 2017 |
| Lunch Hour NW Ltd | Hospitality | 2025 |
| Lundell Steel Limited | Manufacturing | 2025 |
| Lundon Interim Management Limited | Professional & scientific | 2026 |
| Lunerrose Ltd | Health & social care | 2021 |
| Lunes Real Estate Ltd | Real estate | 2023 |
| Lunescu Construction Ltd | Construction | 2020 |
| Lunforge Business Solutions Ltd | Information & communication | 2025 |
| Lunna Gifts Limited | Wholesale & retail | 2022 |