| LT Cargo Ltd | Transport & logistics | 2025 |
| Lthm Ltd | Transport & logistics | 2023 |
| Luaii Ltd | Wholesale & retail | 2023 |
| Luar's Production Ltd | Information & communication | 2021 |
| Lubi Ltd | Wholesale & retail | 2020 |
| Luca (Italian) Limited | Hospitality | 2026 |
| Luca Electrical Ltd | Construction | 2026 |
| Luca Gulisano Ltd | Transport & logistics | 2021 |
| Lucas T Electrical Ltd | Construction | 2014 |
| Lucastar Ltd | Transport & logistics | 2022 |
| Lucenta Aesthetics Ltd | Health & social care | 2026 |
| Lucia Felgate Play Therapy Services Ltd | Health & social care | 2025 |
| Luciano's Painting and Decorating Ltd | Construction | 2023 |
| Lucid Analytics Limited | Administrative & support | 2014 |
| Lucid Southampton Limited | Wholesale & retail | 2013 |
| Lucky Buddha 888 Limited | Hospitality | 2014 |
| Lucky Canteen Limited | Hospitality | 2023 |
| Lucky JC Ltd | Hospitality | 2026 |
| Lucky Parcel Ltd | Transport & logistics | 2022 |
| Lucky Peace Love Limited | Hospitality | 2023 |
| Lucky Thirteen Ltd. | Information & communication | 2003 |
| Lucy's Kitchen Sandbanks Ltd | Hospitality | 2016 |
| Lucymay Ventures Ukeig | | 2008 |
| Ludus Health & Wellness Ltd | Arts & recreation | 2020 |
| Luella Properties Limited | Real estate | 2021 |
| Luffabs Limited | Wholesale & retail | 2025 |
| Luis LIU Ltd. | Manufacturing | 2016 |
| Luk's Motors London Ltd | Wholesale & retail | 2021 |
| Lukamara Limited | Information & communication | 2019 |
| Luke Aviation Services Limited | Transport & logistics | 2022 |
| Luke Hughes Painting&Decorating Limited | Construction | 2023 |
| Luke LOW Consulting Ltd | Professional & scientific | 2026 |
| Luke Nolan Oncology Limited | Health & social care | 2020 |
| Luke Orchard Hair Studio Ltd | Other services | 2020 |
| Luken Beck Consultants Limited | Professional & scientific | 2014 |
| Lukju Ltd | Manufacturing | 2020 |
| Lulix Labs Ltd | Information & communication | 2026 |
| Lulu DU Toit Consulting Ltd | Information & communication | 2019 |
| Lulu's Doggy Day Care & Boarding Ltd | Agriculture & fishing | 2025 |
| Lulworth Properties Ltd | Real estate | 2024 |
| Lumastore Limited | Wholesale & retail | 2020 |
| Lumax Decorating Limited | Construction | 2007 |
| Lumenedge Ltd | Professional & scientific | 2025 |
| Lumenuk Limited | Manufacturing | 2005 |
| Lumera RE Ltd | Professional & scientific | 2025 |
| Lumeria EYE Care Limited | Health & social care | 2025 |
| Lumi Design and Engineering Limited | Wholesale & retail | 2013 |
| Lumi Domestic Support Ltd | Administrative & support | 2026 |
| Lumin Apps Ltd | Information & communication | 2026 |
| Luminar Ltd | Wholesale & retail | 2023 |
| Luminary Partners Limited | Administrative & support | 2023 |
| Luna Rose Living Limited | Wholesale & retail | 2022 |
| Luna Testing Limited | Professional & scientific | 2010 |
| Lunarq Limited | Wholesale & retail | 2026 |
| Lunchtime Content Limited | Administrative & support | 2014 |
| Lund-Conlon Removers & Storers Limited | Professional & scientific | 2004 |
| Lunnon Upholstery Ltd | Other services | 2011 |
| Lupin Gardens (Winchester) Limited | Households | 2003 |
| Luranco Mechanical Ltd | Construction | 2026 |
| Lurion Ltd | Manufacturing | 2020 |
| Lurodev Limited | Health & social care | 2023 |
| Lush Catering and Events Limited | Hospitality | 2017 |
| Lush Developments Limited | Real estate | 2020 |
| Lush Nails & Beauty Bar Limited | Other services | 2025 |
| Lush Property Holdings Limited | Real estate | 2020 |
| Lushmass Limited | Other services | 1987 |
| Lusud Ltd | Health & social care | 2015 |
| Luther Projects Ltd | Other services | 2024 |
| Luttpan Logistics Ltd | Transport & logistics | 2018 |
| Luttrells Limited | Construction | 1987 |
| LUV Floors South Ltd | Construction | 2026 |
| LUV to Care Home Care Ltd | Health & social care | 2020 |
| Luvana Verse Ltd | Information & communication | 2025 |
| Luvvitwantit Limited | Wholesale & retail | 2010 |
| Luvyourz Ltd | Wholesale & retail | 2024 |
| LUX Group Limited | Water & waste | 2016 |
| LUX Hair Ltd | Other services | 2016 |
| LUX Stays South Ltd | Hospitality | 2026 |
| LUX UP Limited | Wholesale & retail | 2026 |
| LUX Ventures Limited | Administrative & support | 2010 |
| Luxe Kitchen Wraps Limited | Professional & scientific | 2021 |
| Luxe Lifestyle Group Limited | Hospitality | 2025 |
| Luxe Locker Ltd | Wholesale & retail | 2024 |
| Luxe Property Specialists Ltd | Real estate | 2025 |
| Luxe Rehome Ltd | Wholesale & retail | 2026 |
| Luxe Renovations Ltd | Construction | 2024 |
| Luxe Venturas Ltd | Administrative & support | 2023 |
| Luxebuild Joinery Ltd | Construction | 2025 |
| Luxelivin' & Co Limited | Real estate | 2024 |
| Luxestay Properties Ltd | Real estate | 2023 |
| Luxiwell Ltd | Wholesale & retail | 2024 |
| Luxman Properties Limited | Real estate | 2019 |
| Luxura Properties Limited | Construction | 2025 |
| Luxurious Renu Beauty Limited | Other services | 2025 |
| Luxury Retail Brands Limited | Wholesale & retail | 2020 |
| LVM Medical Ltd | Public administration | 2025 |
| LVS Solutions Ltd | Administrative & support | 2023 |
| LW Accommodation Ltd | Real estate | 2025 |
| LW Plastering & Rendering Limited | Construction | 2007 |
| Lwhg Ltd | Wholesale & retail | 2022 |