| Lively Sprout Community CIC | Education | 2026 |
| Liven Landscapes Ltd | Construction | 2025 |
| Livepixel Systems Services Limited | Information & communication | 2014 |
| Liveria Limited | Real estate | 2024 |
| Living Environment Global Limited | Professional & scientific | 2025 |
| Living the Novel Life Limited | Manufacturing | 2024 |
| Livmore Ltd | Administrative & support | 2022 |
| Lixxy Limited | Professional & scientific | 2021 |
| Lizard MAN FM Ltd | Manufacturing | 2025 |
| Lizzys Hogroast Ltd | Hospitality | 2021 |
| LJ Downing Properties Ltd | Real estate | 2021 |
| Ljay & SON Ltd | Wholesale & retail | 2025 |
| LJB Builders Limited | Construction | 2025 |
| LJB Property Services Ltd | Real estate | 2024 |
| LJR Fire & Security Group Ltd | Construction | 2020 |
| Ljray Medical Writing Ltd | Professional & scientific | 2026 |
| LK Heat Ltd | Construction | 2015 |
| LK Roofing & Cladding Services Limited | Construction | 2020 |
| LK Vending Services Limited | Wholesale & retail | 2026 |
| Lkgr Ltd | Wholesale & retail | 2025 |
| Ll.Billas Ltd | Wholesale & retail | 2023 |
| LLD Investments Limited | Real estate | 2021 |
| Llumoo (UK) Ltd | Wholesale & retail | 2025 |
| LM Business Connect Ltd | Wholesale & retail | 2025 |
| Lmaison Crest Ltd | Construction | 2025 |
| Lmg-Serv Limited | Transport & logistics | 2018 |
| LMJ Enterprise Ltd | Construction | 2019 |
| LMK Beauty Limited | Other services | 2025 |
| LMK Technologies Limited | Information & communication | 2018 |
| LMO Property Group Limited | Real estate | 2026 |
| LMP Masonry Ltd | Construction | 2024 |
| LO Upea Ltd | Wholesale & retail | 2026 |
| Lo-Ca Living Ltd | Real estate | 2025 |
| Loaded Buns Ltd | Hospitality | 2022 |
| Lobe & Larynx Limited | Professional & scientific | 2025 |
| Loc-Docs Services Ltd. | Health & social care | 2009 |
| Local Echo Ltd | Professional & scientific | 2024 |
| Location Sensation Limited | Hospitality | 2026 |
| Lock the Door Ltd | Wholesale & retail | 2024 |
| Lock, Canal & Castle Limited | Wholesale & retail | 2026 |
| Locked in Escape Rooms Cornwall Ltd | Arts & recreation | 2022 |
| Lockedinhoops Ltd | Arts & recreation | 2023 |
| Lockfit USA Limited | Other services | 2025 |
| Lockr Ltd | Information & communication | 2026 |
| Locksmiths Exhibition Ltd | Administrative & support | 2010 |
| Loctool Limited | Professional & scientific | 2020 |
| Locum ACP Limited | Other services | 2023 |
| Locupleto Limited | Real estate | 2024 |
| Lodal Limited | Manufacturing | 2022 |
| Lodestar Events Ltd | Hospitality | 2024 |
| Lodge Lettings Limited | Real estate | 2011 |
| Loft Box Ltd | Construction | 2025 |
| Lofty Softy Limited | Information & communication | 2026 |
| Logic Ventures Limited | Real estate | 2016 |
| Logic Worx Limited | Information & communication | 2009 |
| Logicrises Ltd | Information & communication | 2018 |
| Logifilms Ltd | Information & communication | 2025 |
| Logistics Inc Ltd | Transport & logistics | 2025 |
| Loidis Property Investments Limited | Real estate | 2023 |
| Loko Studio Ltd | Professional & scientific | 2025 |
| Lola Boyz Ltd | Manufacturing | 2025 |
| Lomavisual Ltd | Administrative & support | 2023 |
| Lomax Antiques Limited | Wholesale & retail | 2023 |
| London & Surrey Property Maintenance & Refurb Ltd | Real estate | 2014 |
| London Bookfair Collective CIC | Wholesale & retail | 2025 |
| London Carpentry Contractors Limited | Manufacturing | 2019 |
| London Dapper Ltd | Wholesale & retail | 2025 |
| London Global Solutions Ltd | Financial services | 2023 |
| London Luxe Properties Ltd | Real estate | 2025 |
| London Noun Ltd | Extraterritorial | 2023 |
| London Post Production Limited | Information & communication | 2012 |
| London Properties Online Ltd | Extraterritorial | 2007 |
| London Property Brokerage Limited | Real estate | 2026 |
| London Property Design Ltd | Real estate | 2014 |
| London Rise Limited | Wholesale & retail | 2025 |
| London Waste Pros Ltd | Water & waste | 2024 |
| Lonely Willow Arts Ltd | Information & communication | 2023 |
| Long Brackland Management Company Limited | Households | 2019 |
| Long Play LAB Ltd | Professional & scientific | 2019 |
| Longlisted Limited | Administrative & support | 2025 |
| Longmuir Property Investments Ltd | Real estate | 2026 |
| Longwood Organic Farmers Limited | Agriculture & fishing | 1964 |
| Longzytech Limited | Information & communication | 2013 |
| Lonmain Limited | Real estate | 1972 |
| Looked After Child Limited | Education | 2023 |
| Loom Light Ltd | Information & communication | 2026 |
| Loombridge Ltd | Professional & scientific | 2025 |
| Loony Limited | Manufacturing | 2026 |
| LOOP2 Consultancy Ltd | Professional & scientific | 2024 |
| Lootdex Limited | Wholesale & retail | 2025 |
| Lord 60 Ltd | Professional & scientific | 2026 |
| Lords Recruitment Limited | Professional & scientific | 2022 |
| Lorenzo Property Company Ltd | Real estate | 2026 |
| Loro Verde Estates Ltd | Real estate | 2026 |
| Lorraine Crooks Ltd | Extraterritorial | 2021 |
| Lost for Words Creations Ltd | Arts & recreation | 2025 |
| Lost in Thought Escapes Ltd | Arts & recreation | 2019 |
| Lost in TV Limited | Arts & recreation | 2003 |
| Lost Lion Limited | Education | 2025 |
| Lothbrook Holdings Ltd | Construction | 2021 |