| LNT Homes Ltd | Real estate | 2024 |
| Lobeg Ltd | Construction | 2019 |
| Local Marketing Made Easy Limited | Other services | 2022 |
| Local Mega Mart Ltd | Wholesale & retail | 2025 |
| Location EX Ltd | Construction | 2016 |
| Locks & Alarms Limited | Administrative & support | 2002 |
| Lockson Services (Holdings) Limited | Financial services | 1996 |
| Lodge Cafe 24 Limited | Hospitality | 2023 |
| Loft Furnishings Ltd | Extraterritorial | 2022 |
| Logan’S Roofing Services Ltd | Construction | 2023 |
| Logman Logistics (UK) Ltd | Wholesale & retail | 2022 |
| Loic Rostand Ltd | Wholesale & retail | 2022 |
| Lokanta Greenwich Ltd | Hospitality | 2021 |
| Lola's Clothier Ltd | Wholesale & retail | 2024 |
| Lolli Bakes Limited | Manufacturing | 2020 |
| Lolopa Ltd | Construction | 2022 |
| Lombardo Capital Ltd | Financial services | 2026 |
| London & Kent Roofing Ltd | Construction | 2017 |
| London & Kent Surveyors Ltd | Construction | 2020 |
| London & South Scaffolding Limited | Construction | 2009 |
| London Academy of Business & Arts Ltd | Education | 2025 |
| London and Kent Builders Ltd. | Construction | 2012 |
| London and Overseas Brokers Ltd | Financial services | 2021 |
| London and SE PUB Co Limited | Hospitality | 2022 |
| London Bespoke Glass Solutions Limited | Manufacturing | 2016 |
| London Bridge Advisors and Partners Ltd | Professional & scientific | 2020 |
| London Build Group Limited | Construction | 2026 |
| London Cleaning Group 6 Ltd | Construction | 2023 |
| London Coins Group (Holdings) Limited | Extraterritorial | 2006 |
| London Comms Ltd | Information & communication | 2016 |
| London Cultural Centre Ltd | Health & social care | 2015 |
| London FIX Scaffolding Ltd. | Construction | 2015 |
| London Foods Wholesaler Ltd | Wholesale & retail | 2015 |
| London Friends Home Ltd | Financial services | 2025 |
| London Furniture Clearance Limited | Wholesale & retail | 2018 |
| London Graduate School Ltd | Education | 2019 |
| London Laundry Group Ltd | Other services | 2024 |
| London Logistics & Management Ltd | Transport & logistics | 2024 |
| London Logistics & Removals Ltd | Transport & logistics | 2023 |
| London Metropolitan Medical Limited | Professional & scientific | 2020 |
| London Millwrights Limited | Professional & scientific | 2011 |
| London Optical Company Limited | Professional & scientific | 1938 |
| London Patient Transport Limited | Transport & logistics | 2021 |
| London Port Services Limited | Transport & logistics | 1996 |
| London Reading Club Ltd | Other services | 2023 |
| London Roofing Solutions Ltd | Construction | 2021 |
| London School of Governance & Leadership Ltd | Education | 2023 |
| London Service Lifts Limited | Manufacturing | 2022 |
| London Stone and Restoration Limited | Construction | 2023 |
| London Street Investment Ltd | Real estate | 2023 |
| London Super Clean Ltd | Administrative & support | 2025 |
| London Tipper Transport Limited | Transport & logistics | 2023 |
| London Tippers Ltd | Transport & logistics | 2021 |
| London UK Enterprises Limited | Wholesale & retail | 2012 |
| Lonely Motors Limited | Wholesale & retail | 2024 |
| Long Acres Camping Ltd | Hospitality | 2022 |
| Longberry Farm Glamping Ltd | Hospitality | 2016 |
| Longbridge Care Services Ltd | Health & social care | 2018 |
| Longbridge Lodge Limited | Health & social care | 2018 |
| Longch Marine Limited | Mining & quarrying | 2015 |
| Longdeed Property Management Limited | Households | 1989 |
| Longhurst Security Services Limited | Professional & scientific | 2016 |
| Longsystem Limited | Transport & logistics | 1984 |
| LOR Construction Ltd | Construction | 2020 |
| Lord JIM Design & Build Ltd | Professional & scientific | 2014 |
| Lorella Palmer Ltd | Professional & scientific | 2021 |
| Loris Holding Ltd | Hospitality | 2024 |
| Lotus Galaxy Ltd | Real estate | 2021 |
| Louvain (Stone) Limited | Real estate | 2004 |
| Love and Harmony Events Ltd | Other services | 2022 |
| Love Ibiza Ltd | Other services | 2015 |
| Love IT - Hair Studio Ltd. | Other services | 2021 |
| Lovedaycare Limited | Education | 2015 |
| Lovell & Lovell Property Holding Limited | Financial services | 2023 |
| Lovemilliesflowers Ltd | Wholesale & retail | 2019 |
| LOW Field Grill Ltd | Other services | 2017 |
| LOW Wood Holdings Limited | Financial services | 2021 |
| Lowbee Technologies Limited | Information & communication | 2025 |
| Lowfield Grill Kebab Ltd | Hospitality | 2025 |
| Lowfield Medical Property Management Limited | Real estate | 2026 |
| Lowrey Mortgages Limited | Financial services | 2016 |
| LOYOLA88 UK Limited | Other services | 2025 |
| LP Transport Ltd | Transport & logistics | 2023 |
| Lpuv Limited | Wholesale & retail | 2024 |
| LPV Gift Wrapping and Stationery Limited | Manufacturing | 2026 |
| LRC Security Limited | Administrative & support | 2024 |
| Lrcr Properties Limited | Real estate | 2017 |
| LRW Engineering Associates Limited | Professional & scientific | 2018 |
| Lrwea Testing Ltd | Professional & scientific | 2026 |
| LS Power & Data Ltd | Administrative & support | 2016 |
| LSA Civil Engineering Ltd | Construction | 2013 |
| LSA Civils Ltd | Construction | 2020 |
| LSB Hair Ltd | Other services | 2021 |
| Ltjk Limited | Real estate | 2021 |
| LTW Consulting Ltd | Administrative & support | 2025 |
| Lucchesi Carins UK Ltd | Manufacturing | 2002 |
| Luce Limited | Real estate | 2000 |
| Lucia Accounts Partners Ltd | Professional & scientific | 2023 |
| Lucia Victoria Interiors Ltd | Wholesale & retail | 2011 |
| Lucid Building Construction Ltd | Construction | 2021 |