| Lstech Ltd | Information & communication | 2013 |
| LT Demolition Ltd | Water & waste | 2014 |
| LT Therapy Ltd | Health & social care | 2022 |
| Ltblandscapers Ltd | Professional & scientific | 2025 |
| LTK Consulting Ltd | Professional & scientific | 2025 |
| LTO Construction Ltd | Construction | 2018 |
| Lu&Ma Consulting Ltd | Professional & scientific | 2013 |
| Lubbock Tutoring Limited | Education | 2025 |
| Luca Civil Rail Ltd | Construction | 2022 |
| Luca Solutions Ltd | Construction | 2023 |
| Lucan Estates Ltd | Real estate | 2007 |
| Lucan Property Traders Limited | Real estate | 2022 |
| Lucas Apea Associates Ltd | Professional & scientific | 2015 |
| Lucas Landscapes MK Ltd | Administrative & support | 2021 |
| Lucas Provision Ltd | Wholesale & retail | 2017 |
| Lucas Stewart Ltd | Information & communication | 2025 |
| Lucas Tree Care Ltd | Administrative & support | 2024 |
| Lucas Wawro Ltd | Transport & logistics | 2016 |
| Lucca Camping Ltd | Hospitality | 2026 |
| Luccw Ltd | Manufacturing | 2025 |
| Lucent Market Ltd | Wholesale & retail | 2024 |
| Luchi Beauty Limited | Other services | 2024 |
| Lucid Cleaning Services Ltd | Administrative & support | 2021 |
| Lucid Connect Ltd | Administrative & support | 2019 |
| Lucid Network Solutions Limited | Administrative & support | 2019 |
| Lucid Promotions Ltd | Professional & scientific | 2022 |
| Lucid Support Services Limited | Administrative & support | 2002 |
| Lucid Workspace Ltd | Administrative & support | 2018 |
| Lucidum Property Limited | Real estate | 2025 |
| Lucky DIP (Nottingham) Limited | Manufacturing | 1998 |
| Lucky Retailers Limited | Wholesale & retail | 2014 |
| Lucky Star Traders Ltd | Wholesale & retail | 2023 |
| Lucky Stars Entertainment Ltd | Information & communication | 2025 |
| Luckybay Homes Ltd | Real estate | 2023 |
| Luckygem Ltd | Wholesale & retail | 2025 |
| Lucrafin Limited | Professional & scientific | 2025 |
| Lucy Childerley Clinic Limited | Health & social care | 2022 |
| Ludify Automotive Ltd | Wholesale & retail | 2022 |
| Luftvis Science Ltd | Wholesale & retail | 2021 |
| LUK Home & Garden Services Ltd | Construction | 2022 |
| Luke Bolton Painting Ltd | Construction | 2026 |
| Luke Catleugh Limited | Professional & scientific | 2022 |
| Luke Hope Design Ltd | Manufacturing | 2022 |
| Luke Miller Studio Ltd | Manufacturing | 2008 |
| Luke's Scents Limited | Wholesale & retail | 2025 |
| Lulab Limited | Professional & scientific | 2025 |
| Lulu Forever Limited | Health & social care | 2011 |
| Lumanositi Limited | Health & social care | 2017 |
| Lumari Asset Management Ltd | Financial services | 2025 |
| Lumari Capital Ltd | Financial services | 2025 |
| Lumb Farm Limited | Real estate | 2000 |
| Lumea Nova Ltd | Wholesale & retail | 2026 |
| Lumen Clinical Ltd | Health & social care | 2026 |
| Lumen Nexus Ltd | Information & communication | 2025 |
| Lumi Digital Ltd | Professional & scientific | 2025 |
| Lumian Systems Limited | Information & communication | 2007 |
| Lumieres Properties Limited | Real estate | 2023 |
| Lumina Datamatics UK Limited | Information & communication | 2022 |
| Lumina Wind Consulting Ltd | Information & communication | 2026 |
| Luminance Optics Ltd | Health & social care | 2020 |
| Luminant International Ltd | Wholesale & retail | 2020 |
| Luminara Media Ltd | Wholesale & retail | 2025 |
| Lumino AV Solutions Limited | Wholesale & retail | 2017 |
| Luminous Holding Limited | Real estate | 2025 |
| Lumière D’Or Ltd | Manufacturing | 2025 |
| Lumley Group Limited | Real estate | 1993 |
| Lumley Properties Limited | Professional & scientific | 2019 |
| Lumosity.Ai Ltd | Information & communication | 2025 |
| Lumu Property Ltd | Real estate | 2015 |
| Luna Culture Limited | Education | 2017 |
| Luna Property Developers Limited | Real estate | 2023 |
| Luna-Mays Salon Ltd | Other services | 2018 |
| Lunafive Limited | Information & communication | 2022 |
| Lunar ARC Studios Limited | Wholesale & retail | 2024 |
| Lunar Ecology Limited | Professional & scientific | 2022 |
| Lunavision Art Ltd | Arts & recreation | 2024 |
| Lunawave Digital Design & Web Solutions Limited | Information & communication | 2025 |
| Lunchboxmk Limited | Hospitality | 2024 |
| Lungu & Co Lawyers Ltd | Professional & scientific | 2025 |
| Lunnco Ltd | Professional & scientific | 2016 |
| Lunnco Property LLP | | 2021 |
| Lunnco Property Services Ltd | Real estate | 2026 |
| Lupas Transport Ltd | Transport & logistics | 2020 |
| Lusa Services Limited | Health & social care | 2013 |
| Lushmetics Ltd | Wholesale & retail | 2025 |
| Lusi Busi Ltd | Transport & logistics | 2021 |
| Luton Counselling Limited | Health & social care | 2012 |
| Luton Dental Hub Limited | Health & social care | 2026 |
| Luton Exhibition Services Limited | Other services | 1998 |
| Luton House Ltd | Health & social care | 2023 |
| Luwi Plumbing Limited | Construction | 2020 |
| Luwood Ltd | Information & communication | 2021 |
| LUX Calibrate Limited | Information & communication | 2024 |
| LUX Clean MK Ltd | Administrative & support | 2022 |
| LUX Trans Logistics Ltd | Transport & logistics | 2015 |
| Luxar Ltd | Manufacturing | 2007 |
| Luxe Alleyway Ltd | Wholesale & retail | 2023 |
| Luxe Development Group Ltd | Construction | 2024 |
| Luxe Groupp Limited | Real estate | 2025 |
| Luxe Layouts Ltd | Professional & scientific | 2026 |