| Lucy Bowes Ltd | Professional & scientific | 2026 |
| Lucy Cavendish Estates Development Limited | Construction | 2019 |
| Lucy Warner Hair Limited | Other services | 2022 |
| Lucy&Lola Ltd | Wholesale & retail | 2021 |
| Lude Holdings UK Ltd | Wholesale & retail | 2024 |
| Ludus Management Company Limited | Households | 2012 |
| Lufflick Holdings Limited | Professional & scientific | 2011 |
| Luhna Ltd | Administrative & support | 2023 |
| Luhui Meida Limited | Information & communication | 2025 |
| Lui's Barber Shop Limited | Other services | 2013 |
| Luiz Ltd | Manufacturing | 2024 |
| LUKASZ86 Ltd | Manufacturing | 2024 |
| Luke Charles Books Limited | Professional & scientific | 2012 |
| Luke Charles Property Limited | Real estate | 2017 |
| Luke Clough Enterprises Limited | Other services | 2019 |
| Luke’S Life Coaching Ltd | Education | 2025 |
| Luklittlecompany Ltd | Manufacturing | 2025 |
| Lulasmart Ltd | Manufacturing | 2025 |
| Lullahum Limited | Administrative & support | 2017 |
| Luma Spritz Ltd | Wholesale & retail | 2026 |
| Luman International Trading Co., Ltd | Wholesale & retail | 2022 |
| Lume Electrical Services Limited | Construction | 2016 |
| Lumen Design UK Ltd | Construction | 2024 |
| Lumi Aesthetics Ltd | Other services | 2026 |
| Lumi Aura Ltd | Wholesale & retail | 2025 |
| Lumie Limited | Professional & scientific | 2006 |
| Lumin Creative Ltd | Wholesale & retail | 2026 |
| Luminabio Labs Ltd | Manufacturing | 2025 |
| Luminance Ltd | Information & communication | 2017 |
| Luminance Technologies Ltd | Information & communication | 2015 |
| Luminance Technology Ltd | Information & communication | 2022 |
| Luminary Roofing Ltd | Construction | 2025 |
| Luminate Advisers Limited | Professional & scientific | 2024 |
| Luminescence Communications Ltd | Administrative & support | 2012 |
| Luminessence Naturals Ltd | Manufacturing | 2018 |
| Luminous Business Strategy Ltd | Hospitality | 2017 |
| Luminous Grants Management Academy Ltd | Professional & scientific | 2023 |
| Luminous Prosperity Trading Ltd | Wholesale & retail | 2025 |
| Lumo Energy Limited | Construction | 2023 |
| Lumographic Limited | Wholesale & retail | 2018 |
| Luna AI Ltd | Information & communication | 2023 |
| Luna Construction Limited | Construction | 2024 |
| Luna Olive Property Ltd | Real estate | 2021 |
| Lunar Academy Limited | Professional & scientific | 2023 |
| Lunar Forge Entertainment Limited | Information & communication | 2023 |
| Lunar Plpm Ltd | Professional & scientific | 2023 |
| Lunava Ltd | Manufacturing | 2025 |
| Lunchtime Company Ltd | Hospitality | 1997 |
| Lunchtime Employee Ownership Trustee Ltd | Administrative & support | 2022 |
| Lunexa Solutions Ltd | Professional & scientific | 2025 |
| Lunga Vista Ltd | Professional & scientific | 2017 |
| Lunlys Ltd | Arts & recreation | 2025 |
| Luolojap Ltd | Wholesale & retail | 2025 |
| Lupescu Paul Ltd | Manufacturing | 2026 |
| Lupton-Smith Properties Ltd | Real estate | 2023 |
| Lusheng Industrial Co., Ltd | Wholesale & retail | 2024 |
| Lushi Builders Ltd | Construction | 2025 |
| Lussi Ltd | Information & communication | 2025 |
| Luvia Digital Ltd | Information & communication | 2017 |
| LUX 1 Homes Ltd | Construction | 2021 |
| LUX Electrical Installations Limited | Construction | 2014 |
| Luxaviation Technical Services Limited | Professional & scientific | 2014 |
| Luxe Landscapers Ltd | Administrative & support | 2026 |
| Luxinnuo Arts and Crafts Co., Ltd | Wholesale & retail | 2020 |
| Luxshinii Ltd | Wholesale & retail | 2019 |
| Luxspa Wellbeing Services Ltd | Health & social care | 2020 |
| Luxtec Global Limited | Manufacturing | 2016 |
| Luxtec Limited | Information & communication | 2014 |
| Luxury Home Developments Limited | Construction | 1998 |
| Luxury Home Lifestyle Limited | Professional & scientific | 2016 |
| Luxury Hype Ltd | Information & communication | 2020 |
| Luxury Visuals Ltd | Professional & scientific | 2019 |
| LV (Somerset) Ltd | Hospitality | 2026 |
| LV Berky Ltd | Manufacturing | 2026 |
| Lvgl Ltd | Information & communication | 2025 |
| LVP Architects Ltd | Professional & scientific | 2020 |
| Lvryyy Ltd | Health & social care | 2019 |
| LW Agile Solutions Limited | Professional & scientific | 2025 |
| Lwdwvt Ltd | Manufacturing | 2025 |
| LWJ Group Limited | Construction | 2025 |
| LWJ Management UK Limited | Wholesale & retail | 2015 |
| Lwjdawvt Ltd | Manufacturing | 2025 |
| Lwmcdonald Limited | Professional & scientific | 2023 |
| Lyallpore Couture Ltd | Wholesale & retail | 2016 |
| Lycocoa Limited | Professional & scientific | 2022 |
| Lycorisradiata AI Co., Limited | Wholesale & retail | 2024 |
| Lycotec Food Limited | Professional & scientific | 2019 |
| Lycotec Limited | Professional & scientific | 2010 |
| Lycotec Pharma Limited | Professional & scientific | 2022 |
| Lyepole Fishing Limited | Real estate | 1930 |
| Lykke & Lumen Ltd | Wholesale & retail | 2025 |
| Lymi CC Ltd | Wholesale & retail | 2025 |
| Lyndewode Enterprises Limited | Professional & scientific | 2017 |
| Lyndon Services Limited | Construction | 2019 |
| Lynfields Management Limited | Households | 1991 |
| Lynn Power Limited | Manufacturing | 2021 |
| Lynntech Limited | Information & communication | 2025 |
| Lynskey Oncology Limited | Health & social care | 2025 |
| Lynx Engineering & Technology Limited | Other services | 2021 |
| Lynx Leasing Ltd | Administrative & support | 2014 |