| Lifestylewealthconsultancy Ltd | Professional & scientific | 2025 |
| Lightworx Ltd | Arts & recreation | 2006 |
| Lihuajin Co., Limited | Wholesale & retail | 2024 |
| Lila Nails and Spa Limited | Other services | 2022 |
| Lilas Group Ltd | Health & social care | 2021 |
| Lilith Trading Ltd | Wholesale & retail | 2026 |
| Lillie Properties Limited | Real estate | 2005 |
| Lillywhite Family Ltd | Real estate | 2023 |
| Lilydale Property Investments Limited | Real estate | 2017 |
| Limitless Consultancy and Design Ltd | Professional & scientific | 2023 |
| Limitless Escapes Ltd | Arts & recreation | 2025 |
| Limoi Properties Ltd | Real estate | 2026 |
| Linehan & Co (Kent) Ltd | Other services | 2024 |
| Linencover Limited | Wholesale & retail | 2025 |
| Link Air Conditioning Ltd | Construction | 2021 |
| Link Asset Holdings Limited | Financial services | 2022 |
| Link Fire Solutions Limited | Construction | 2023 |
| Linkd Group Limited | Wholesale & retail | 2023 |
| Linkteamcars Ltd | Administrative & support | 2018 |
| Linnell Drainage Limited | Water & waste | 2024 |
| Lions Pride Projects CIC | Construction | 2026 |
| Lipiyo Industrial Company Limited | Extraterritorial | 2017 |
| Lipscombe Building Contractors Limited | Construction | 2002 |
| Lisa Watson Services for Women Limited | Health & social care | 2020 |
| Listenout Limited | Information & communication | 2010 |
| Litai Industrial Limited | Manufacturing | 2019 |
| Litho Plan Limited | Financial services | 1963 |
| Little Buddha Newsagents Limited | Extraterritorial | 2016 |
| Little Burton II (Ashford) Management Company Limited | Households | 2003 |
| Little Gems (Dorset) Limited | Education | 2017 |
| Little Paws 'N' Claws Ltd | Other services | 2016 |
| Little Poland Gillingham Ltd | Wholesale & retail | 2025 |
| Little York Farm Management Limited | Real estate | 2001 |
| Littleworld Global Ltd | Wholesale & retail | 2022 |
| LIV Luttrell Ltd | Manufacturing | 2016 |
| Livefox Ltd | Information & communication | 2026 |
| Livi Design Limited | Professional & scientific | 2018 |
| Living Axis UK Limited | Wholesale & retail | 2025 |
| Living Flame Heating Ltd | Construction | 2010 |
| Livingstone Kent Ltd | Other services | 2024 |
| Liyana's Spice Limited | Hospitality | 2015 |
| Lizblessing Healthcare Ltd | Health & social care | 2022 |
| LJ (Kent) Limited | Wholesale & retail | 2024 |
| LJI Properties (BRR) Ltd | Real estate | 2024 |
| LJK Carpentry Limited | Construction | 2021 |
| LJS Construction Services Ltd | Construction | 2024 |
| LJT Consultancy Ltd | Professional & scientific | 2023 |
| LJW Building Services (South East) Ltd | Construction | 2020 |
| LK Property Holdings Limited | Real estate | 2015 |
| LKD Cleaning Limited | Administrative & support | 2024 |
| Lloyds Heating Services Ltd | Construction | 2021 |
| LMB Surfacing Ltd | Construction | 2017 |
| LMN Couriers Ltd | Transport & logistics | 2013 |
| LO Adej Limited | Construction | 2021 |
| Location Fitness Ltd. | Transport & logistics | 2000 |
| Location Hunt Ltd | Arts & recreation | 2015 |
| Lock Care Ltd | Financial services | 2024 |
| Lock DOC Ltd | Administrative & support | 2023 |
| Loft & Build Ltd | Construction | 2019 |
| Logic Links Distribution Ltd | Wholesale & retail | 2025 |
| Logic Property Limited | Real estate | 2020 |
| Logicbean Limited | Information & communication | 2013 |
| Loliup Limited | Wholesale & retail | 2025 |
| Lomghad Limited | Information & communication | 2017 |
| Lomstar 6 Limited | Health & social care | 2023 |
| London Best Cleaner Ltd | Administrative & support | 2025 |
| London Bump Keys Ltd | Manufacturing | 2019 |
| London EYE Films Limited | Information & communication | 2012 |
| London Fire Solutions Limited | Manufacturing | 2021 |
| London Hot Tubs and Wellness Limited | Wholesale & retail | 2015 |
| London Road AI and IT Services Ltd | Information & communication | 2026 |
| London Wellness (Holdings) Ltd | Financial services | 2015 |
| Long Long International Trade Co., Ltd | Manufacturing | 2024 |
| Longbow Ecology Ltd | Professional & scientific | 2024 |
| Lonsidium Ltd | Wholesale & retail | 2025 |
| Loop Toop Ltd | Wholesale & retail | 2024 |
| Looptech Fire & Security Ltd | Administrative & support | 2021 |
| Lope Farm Limited | Other services | 2013 |
| Lord-Kunde Recruitment Services Limited | Wholesale & retail | 2020 |
| Lords Trim Limited | Other services | 2025 |
| Lordswood AFC Limited | Arts & recreation | 2024 |
| Lorenzo Limited | Real estate | 1990 |
| Lotus Property Ltd | Real estate | 2020 |
| Louise Bodycombe Ltd | Other services | 2013 |
| Louisville 1957 Limited | Extraterritorial | 2013 |
| Louted Steel Ltd | Construction | 2025 |
| Love Daily Ministries Ltd | Information & communication | 2015 |
| Lovedoorsandwindows Ltd | Construction | 2024 |
| Lovian TEC Ltd | Extraterritorial | 2024 |
| LOW Autobodies Southwest Ltd | Wholesale & retail | 2026 |
| LR Homes and Properties Ltd | Real estate | 2019 |
| LS Fire Protection Ltd | Construction | 2023 |
| LSG Lettings Limited | Real estate | 2022 |
| LSP Supply Limited | Wholesale & retail | 2020 |
| LT Antiques Limited | Wholesale & retail | 2015 |
| Lubek-Wollaston Mews Ltd | Households | 2017 |
| Luca Logistics & Transport Services Ltd | Wholesale & retail | 2018 |
| Luca Rail Ltd | Transport & logistics | 2019 |
| Lucas First AID Training Limited | Education | 2020 |
| Lucas Mitchenall Accessories Limited | Manufacturing | 1980 |