| London Mortgage Partners Limited | Financial services | 2019 |
| London Music School | Education | 2007 |
| London on the Go Limited | Real estate | 2019 |
| London Prime Academy Ltd | Education | 2020 |
| London Property Advisors Ltd | Wholesale & retail | 2020 |
| London Property Maintenance and Renovation Limited | Construction | 2016 |
| London Real Estate BDC Ltd | Construction | 2021 |
| London Realty International Ltd | Real estate | 2019 |
| London Refurbishment Group Limited | Construction | 2019 |
| London Resource Group Ltd | Information & communication | 2019 |
| London Road Foods Ltd | Hospitality | 2024 |
| London Roofing Specialist Limited | Construction | 2016 |
| London Rooms Rental Solutions Ltd | Hospitality | 2017 |
| London RUG Company Ltd | Wholesale & retail | 2013 |
| London Sans Ltd | Manufacturing | 2018 |
| London Signatures Ltd | Wholesale & retail | 2021 |
| London Sovereign Capital Ltd | Wholesale & retail | 2026 |
| London SPV Limited | Real estate | 2022 |
| London Steel and Metals Ltd | Manufacturing | 2013 |
| London Taxi Bike Limited | Transport & logistics | 2014 |
| London Textiles Studios Ltd | Education | 2020 |
| London Training College for International Qualifications & Consultancy Ltd | Education | 2026 |
| London Travelling Care Limited | Transport & logistics | 2019 |
| London Tropical Ltd | Hospitality | 2021 |
| London Van Movers Limited | Transport & logistics | 2025 |
| London VC Summit Ltd | Administrative & support | 2025 |
| London VIP Solution Limited | Administrative & support | 2019 |
| London Wear Limited | Wholesale & retail | 2021 |
| London Windows and Doors Ltd | Construction | 2018 |
| London Youth Sports Network CIC | Education | 2025 |
| London's Learning Ltd | Education | 2019 |
| Londonepc Limited | Administrative & support | 2019 |
| Londoners Apartments Ltd | Real estate | 2026 |
| Londonfix Ltd | Construction | 2019 |
| Londongate E Ltd | Professional & scientific | 2017 |
| Londonpharma Limited | Other services | 2007 |
| Londonz Ltd | Wholesale & retail | 2022 |
| Lone Island Ltd | Extraterritorial | 2016 |
| Lone Worlds CBC | Health & social care | 2022 |
| Long BAO Xiang Limited | Wholesale & retail | 2021 |
| Long Clevis Estates Ltd | Real estate | 2026 |
| Long Jing (Cardiff) Ltd | Hospitality | 2022 |
| Long Resource International Limited | Professional & scientific | 2013 |
| Long Term International Trade Co., Ltd. | Wholesale & retail | 2022 |
| Long Whale Ltd | Information & communication | 2025 |
| Longacre Properties (Wales) Limited | Professional & scientific | 2000 |
| Longbai Ltd | Wholesale & retail | 2024 |
| Longevity Organics Ltd | Other services | 2019 |
| Longevity Smiles Limited | Health & social care | 2025 |
| Longevity Zone Ltd | Health & social care | 2025 |
| Longhours Limited | Wholesale & retail | 2002 |
| Longshao Trade Ltd | Wholesale & retail | 2024 |
| Longtrade Organization L.P. | | 2017 |
| Longunit Residents Management Limited | Real estate | 1988 |
| Longwave Recording Studio Limited | Information & communication | 2008 |
| Longwood Financial Planning Limited | Professional & scientific | 2016 |
| Longworth Credit Services Ltd | Other services | 2014 |
| Longworth Hall Hotel Limited | Hospitality | 2018 |
| Longxu International Import and Export Trading Ltd. | Extraterritorial | 2024 |
| Lonhart Services Limited | Information & communication | 2021 |
| Lonicks Solutions Limited | Construction | 2014 |
| Lonitae Limited | Wholesale & retail | 2025 |
| Lonore London Limited | Wholesale & retail | 2025 |
| Lonsdale Commercial Body Builders Limited | Manufacturing | 2003 |
| Lonsdale Vehicle Contracts Limited | Wholesale & retail | 2014 |
| Lont Limited | Wholesale & retail | 2025 |
| Look Fashion Stores Ltd | Wholesale & retail | 2026 |
| Look FH Ltd | Wholesale & retail | 2019 |
| Look Games Ltd | Wholesale & retail | 2018 |
| Look of Dress Ltd | Wholesale & retail | 2025 |
| Lookdoory Ltd | Wholesale & retail | 2025 |
| Looks Good Contractors Limited | Construction | 2003 |
| Loola Cleaning Service Limited | Administrative & support | 2021 |
| Loom Root Systems Ltd | Information & communication | 2025 |
| Loomens Ltd | Information & communication | 2024 |
| Loomora Ltd | Wholesale & retail | 2025 |
| Loonch Trading UK Limited | Professional & scientific | 2019 |
| Loop Technology Partners Limited | Financial services | 2020 |
| Loop the Loop Limited | Professional & scientific | 2025 |
| Loophole Robotics Ltd | Manufacturing | 2025 |
| Loopiquest Ltd | Information & communication | 2025 |
| Looplogic Ltd | Information & communication | 2023 |
| Loopsync Retail Ltd | Wholesale & retail | 2026 |
| Loopyreop Ltd | Wholesale & retail | 2025 |
| Loosemores Services | Administrative & support | 1978 |
| Loot Foundry Ltd | Information & communication | 2024 |
| Loph Ltd | Professional & scientific | 2021 |
| Lora Ltd | Wholesale & retail | 2025 |
| Lord Lettings Limited | Real estate | 2016 |
| Lord Nelson Inn (Treharris) Ltd | Hospitality | 2023 |
| Lord of Wheels Driving Academy Ltd | Education | 2025 |
| Lordhirst Limited | Health & social care | 2013 |
| Lordhirst Properties Ltd | Real estate | 2020 |
| Lords Builders & Developers Ltd | Construction | 2019 |
| Lords Gomer Property Limited | Real estate | 2022 |
| Loregrain Ltd | Wholesale & retail | 2025 |
| Lorem Group PC | | 2017 |
| Lorem Inc Ltd | Other services | 2023 |
| Lorenc Ltd | Transport & logistics | 2019 |
| Lorencavins Ltd | Wholesale & retail | 2021 |