| LGM Residential Ltd | Real estate | 2026 |
| LH Clearances Ltd | Water & waste | 2022 |
| LI Supplies Ltd | Wholesale & retail | 2020 |
| Liberty Horizon Ltd | Health & social care | 2025 |
| Libman UK Real Estate Limited | Real estate | 2024 |
| Libra Reformer Limited | Health & social care | 2026 |
| Libran AFA Limited | Real estate | 2025 |
| Life and Soul Place Ltd | Wholesale & retail | 2025 |
| Lifetime Investment Ltd | Real estate | 2021 |
| Lightplan Limited | Professional & scientific | 1948 |
| Lilirose Properties Limited | Real estate | 2021 |
| Lilly Hugz Incorporated Limited | Health & social care | 2017 |
| Lily Gardner Limited | Wholesale & retail | 1999 |
| Lily Vale Property Investment Ltd | Real estate | 2023 |
| Limitless Mobile Garage Ltd | Wholesale & retail | 2020 |
| LIN and IVY Gardeners Ltd | Other services | 2017 |
| Lina Living Ltd | Real estate | 2025 |
| Lindsey Oliver Consulting Limited | Information & communication | 2014 |
| Linetech Limited | Information & communication | 2025 |
| Linguistic Experts Language Services Limited | Professional & scientific | 2026 |
| Lion's DEN Grooming Ltd | Other services | 2023 |
| Lips and Lines London Limited | Other services | 2022 |
| Lips and Lines Skin Limited | Other services | 2022 |
| Litai Legal Consultancy Limited | Hospitality | 2020 |
| Little Bird Ventures Limited | Financial services | 2018 |
| Little Builds Ltd | Construction | 2025 |
| Little More Conversation Limited | Health & social care | 2020 |
| Little Sparrows Day Nursery Ltd | Education | 2014 |
| Little Vape Shop Ltd | Hospitality | 2025 |
| Littlesparksempire Limited | Information & communication | 2025 |
| Liva International Limited | Wholesale & retail | 2023 |
| Live Inspiration Limited | Construction | 2017 |
| Live Love Soca Ltd | Other services | 2017 |
| Living Crafts (UK) Limited | Wholesale & retail | 2025 |
| Living in the Sixties Limited | Real estate | 2010 |
| LJ Bumpers and Smart Repairs Ltd | Wholesale & retail | 2023 |
| LJH Builders Limited | Administrative & support | 2010 |
| LJH Kitchens and Bathrooms Limited | Construction | 2014 |
| LJS Talent Management Limited | Administrative & support | 2026 |
| LK Decorators Ltd | Construction | 2022 |
| LKB Building Optimisation Ltd | Construction | 2024 |
| LKF & Corsica Ltd | Real estate | 2022 |
| LKG Ltd | Wholesale & retail | 2022 |
| LKM Stone & Ceramics Ltd | Construction | 2021 |
| Ll&R Ltd | Construction | 2026 |
| LLS Commercial Ltd | Wholesale & retail | 2019 |
| LMA Studios Ltd | Arts & recreation | 2023 |
| Lnhsr Limited | Construction | 2020 |
| Loanlink Finance Limited | Financial services | 2024 |
| Lobbers Logistics Limited | Transport & logistics | 2023 |
| Local Brace Stores Limited | Wholesale & retail | 2020 |
| Lochside Property Group Limited | Real estate | 2025 |
| Locklane Property Ltd | Real estate | 2020 |
| Locumexpress Ltd | Health & social care | 2024 |
| LODGE204 Properties Ltd | Real estate | 2019 |
| Logan Civil Engineering Limited | Construction | 2013 |
| Logic 27 Ltd | Financial services | 2026 |
| Logic Property Maintenance Limited | Construction | 2019 |
| Logiq Technology Limited | Information & communication | 2023 |
| London Basement Conversion Limited | Construction | 2024 |
| London Block Paving Limited | Administrative & support | 2008 |
| London Boxing Academy Limited | Arts & recreation | 2003 |
| London Bridge 19 Limited | Hospitality | 2009 |
| London Car Glass Limited | Wholesale & retail | 2024 |
| London Ceramic LAB Limited | Health & social care | 2018 |
| London Coffee Factory Ltd | Wholesale & retail | 2023 |
| London Dustless Blasting Ltd | Transport & logistics | 2017 |
| London Examinations Board Limited | Education | 2000 |
| London International Violin School Ltd | Education | 2016 |
| London Light Therapy Co Ltd | Wholesale & retail | 2025 |
| London Pergola Ltd | Manufacturing | 2016 |
| London Resin Flooring Ltd | Construction | 2017 |
| London SPV Investment Limited | Real estate | 2025 |
| London Storage Point Ltd | Transport & logistics | 2015 |
| Londoner Packaging Ltd | Wholesale & retail | 2025 |
| Londonlighttherapyco Ltd | Wholesale & retail | 2025 |
| Long Green Property Services Limited | Construction | 2024 |
| Long Ridge Training Ltd | Other services | 2016 |
| Look Property (UK) Limited | Real estate | 2022 |
| Lord and Family Limited | Real estate | 2023 |
| Lordinx Estate Ltd | Real estate | 2026 |
| Lordscourierservices Ltd | Transport & logistics | 2025 |
| Lorenzo DI Francesco Limited | Hospitality | 2015 |
| Lorryco Fleet Care Ltd | Wholesale & retail | 2026 |
| Lorryco Ltd | Transport & logistics | 2022 |
| Lost World Adventure Golf Ltd | Arts & recreation | 2016 |
| Lotus Global Investments Limited | Financial services | 2024 |
| Lotus Global Property Limited | Financial services | 2025 |
| Lousaz Limited | Health & social care | 2017 |
| Love Juice Ltd | Hospitality | 2025 |
| Loveboxlondon Ltd | Wholesale & retail | 2025 |
| Loveday Creative Ltd | Information & communication | 2023 |
| LOW Carbon Beef Company Limited | Wholesale & retail | 2024 |
| Lowes Domestics Limited | Other services | 2010 |
| LQ Romford Ltd | Arts & recreation | 2025 |
| Lrcy Ltd | Professional & scientific | 2022 |
| LRS Projects Ltd | Professional & scientific | 2026 |
| LSA Construction Ltd | Construction | 2015 |
| Lsad Ltd | Real estate | 2017 |
| Lshe Plumbing Limited | Construction | 2017 |