| Lounge 33 Luton Limited | Hospitality | 2024 |
| Lounge India (MM) Limited | Hospitality | 2016 |
| Lounge India Bedfordshire Limited | Real estate | 2014 |
| Lounge India Huntingdon Ltd | Real estate | 2015 |
| Lounge India Limited | Real estate | 2009 |
| Louws Landscaping Ltd | Manufacturing | 2020 |
| Love by Lucy and Liam Limited | Hospitality | 2017 |
| Love Hair Enterprise Limited | Other services | 2024 |
| Love Luton CIC | Professional & scientific | 2022 |
| Love NOT WAR Wellness Limited | Other services | 2026 |
| Love Nurture Nature Ltd | Administrative & support | 2016 |
| Love RAY Ltd | Wholesale & retail | 2021 |
| Love, Dhiva X Ltd | Extraterritorial | 2021 |
| Loveens Parlour Ltd | Other services | 2016 |
| Lovepreet SINGH4 Ltd | Construction | 2026 |
| Lovett Green (LJG) Holdings Ltd | Real estate | 2018 |
| Loveyard Health & Care Ltd | Health & social care | 2026 |
| LOW Rates Cars Hire Ltd | Administrative & support | 2016 |
| Lowcodeminds Ltd | Information & communication | 2020 |
| Lowndes Square Holdings Limited | Financial services | 2022 |
| Loyal Ecom Ltd | Wholesale & retail | 2024 |
| Lozovanworks Ltd | Transport & logistics | 2019 |
| LP Fitness UK Ltd | Arts & recreation | 2026 |
| Lrek Limited | Other services | 2022 |
| LRH Electrics Ltd | Construction | 2023 |
| LRW Bricklaying Limited | Construction | 2020 |
| LS Legal Solutions Ltd | Professional & scientific | 2024 |
| LS Roofing and Builder Ltd | Construction | 2024 |
| LS Technology Ltd | Information & communication | 2026 |
| Lsah Consultant Ltd | Extraterritorial | 2025 |
| LSC Carpentry Limited | Manufacturing | 2025 |
| LSD Food Services Ltd | Hospitality | 2023 |
| Lsiw Plumbing Ltd | Construction | 2025 |
| LSM Building Services Ltd | Construction | 2025 |
| LST Construction Solutions Ltd | Construction | 2018 |
| Lsxo Afterdrk Nights Ltd | Arts & recreation | 2026 |
| LT Properties Facility Management Ltd | Administrative & support | 2024 |
| LT Properties Ltd | Real estate | 2015 |
| LT Properties Services Apartments Ltd | Hospitality | 2024 |
| LTN BT Services Limited | Wholesale & retail | 2026 |
| LTN Couriers Ltd | Transport & logistics | 2020 |
| LTN Fish & Chips Ltd | Hospitality | 2026 |
| LTN Minibuses Limited | Transport & logistics | 2024 |
| LTN Motors Ltd | Wholesale & retail | 2013 |
| LTN Property Solutions Ltd | Real estate | 2022 |
| LTN RK Services Limited | Wholesale & retail | 2025 |
| LTN Services Limited | Wholesale & retail | 2025 |
| LU Barbers Ltd | Other services | 2006 |
| LU11RT Ltd | Hospitality | 2024 |
| LU20 Ltd | Wholesale & retail | 2024 |
| Luba Building Services Ltd | Construction | 2014 |
| Luca Building Limited | Construction | 2016 |
| Luca Utilities Ltd | Construction | 2024 |
| Lucac Ltd | Construction | 2024 |
| Lucalily Pathogenics Limited | Health & social care | 2015 |
| Lucas Real Estate Ltd | Real estate | 2024 |
| Lucas Speed Ltd | Transport & logistics | 2020 |
| Lucent Lock Limited | Information & communication | 2024 |
| Lucid Residentials Ltd | Real estate | 2021 |
| Luciene James Limited | Extraterritorial | 1991 |
| Lucky D&P Ltd | Administrative & support | 2014 |
| Lucky Furniture & Carpets Limited | Wholesale & retail | 2018 |
| Lucky Haulage Ltd | Transport & logistics | 2015 |
| Lucky House Company Ltd | Hospitality | 2024 |
| Lucky Property Services Limited | Construction | 2008 |
| Lucky Spot Ltd | Administrative & support | 2017 |
| LUCKY10 Ltd | Wholesale & retail | 2022 |
| Luckytrim Limited | Arts & recreation | 2020 |
| Ludlow Estates Ltd | Hospitality | 2022 |
| Lugresa Ltd | Manufacturing | 2018 |
| Lugus Ceramics C.I.C. | Arts & recreation | 2023 |
| LUK Land Ltd | Wholesale & retail | 2024 |
| LUK Logistics Limited | Transport & logistics | 2022 |
| Lukasz Wiatrzyk Ltd | Transport & logistics | 2017 |
| Lukasz.Welder Limited | Manufacturing | 2015 |
| Luli Cleaning Services Ltd | Administrative & support | 2025 |
| Lulu Mobile Repairs Ltd | Wholesale & retail | 2025 |
| Luma Clean Ltd | Administrative & support | 2024 |
| Lumadata Ltd | Information & communication | 2026 |
| Lumen One Ltd | Financial services | 2026 |
| Lumen Smart Ltd | Real estate | 2026 |
| Lumenrise Ltd | Wholesale & retail | 2025 |
| Lumera Medical Ltd | Professional & scientific | 2026 |
| Lumi Trans Ltd | Transport & logistics | 2026 |
| Lumia Energy UK Ltd | Manufacturing | 2023 |
| Lumimi Limited | Information & communication | 2022 |
| Luminous Minds Therapy Ltd | Health & social care | 2025 |
| Lumo Trade Limited | Wholesale & retail | 2025 |
| Lumosh Limited | Information & communication | 2025 |
| Lunar IT Consulting UK Limited | Information & communication | 2023 |
| Lunor Services Ltd | Other services | 2025 |
| Lunova Group Ltd | Real estate | 2013 |
| Lupas Production Limited | Wholesale & retail | 2019 |
| Lupu&Removals Ltd | Transport & logistics | 2025 |
| Lush Beauty by Rose Ltd | Other services | 2020 |
| Lush Lotus Community Interest Company | Education | 2021 |
| Lushbeautyville Limited | Arts & recreation | 2020 |
| Lusial Ltd | Professional & scientific | 2026 |
| Lusitania UK Ltd | Real estate | 2009 |
| Luso Trading Limited | Professional & scientific | 2012 |