| Lakshmi Chowk Limited | Hospitality | 2025 |
| Lalum Trade & Care Ltd | Health & social care | 2022 |
| Landmark Executive Chauffeurs Ltd | Transport & logistics | 2023 |
| Lanhill Properties Limited | Real estate | 1955 |
| Lanpartsdirect Limited | Information & communication | 2010 |
| Lany Electrical Limited | Construction | 2026 |
| Lash Amoré Beauty Hub Ltd | Other services | 2019 |
| Laudanum Limited | Manufacturing | 2025 |
| Laurel Food & Wine Ltd | Wholesale & retail | 2009 |
| Layerform System Limited | Manufacturing | 2025 |
| LAZ Vehicle Assist Ltd | Manufacturing | 2026 |
| Learn to Swim With Megan Ltd | Education | 2024 |
| Lebed Property Limited | Real estate | 2017 |
| LEE Albert Wilson Limited | Administrative & support | 2013 |
| Leen Developments Ltd | Information & communication | 2025 |
| Leeson Plumbing & Heating Ltd | Construction | 2013 |
| Legacy Cars Ltd | Wholesale & retail | 2018 |
| Legacy Holdings Group Ltd | Financial services | 2024 |
| Legacy Lifestyle Ltd | Information & communication | 2022 |
| Legacy Moves Ltd | Real estate | 2020 |
| Legal Gate Ltd | Wholesale & retail | 2012 |
| Legend Builders Ltd | Extraterritorial | 2023 |
| Lenora Women’S Health Ltd | Health & social care | 2026 |
| Leocap Private Limited | Wholesale & retail | 2025 |
| Lestormofficial Ltd | Wholesale & retail | 2021 |
| Levi Development Limited | Construction | 2017 |
| LEX25 Limited | Professional & scientific | 2026 |
| Lexoni Services Limited | Other services | 2016 |
| LGA Property Sourcing Ltd | Real estate | 2023 |
| LGG Cars Limited | Construction | 2025 |
| LGK Services Ltd | Manufacturing | 2025 |
| Libra Sante & Consultancy Ltd | Transport & logistics | 2021 |
| Liebencroft Limited | Construction | 2025 |
| Lifecare Consulting Limited | Professional & scientific | 2019 |
| Lifetime Motors Ltd | Wholesale & retail | 2023 |
| Lighting Original Ltd | Administrative & support | 2021 |
| Liitz.Co.Uk Trading AS Amru Limited | Wholesale & retail | 2014 |
| Lilly Brow Bar Ltd | Other services | 2018 |
| Lime MEP Limited | Financial services | 2025 |
| Linch Corporation Ltd | Administrative & support | 2025 |
| LINK2LINK Services Limited | Transport & logistics | 2024 |
| Lionel Belga Ltd | Information & communication | 2022 |
| LIONS74 Ltd | Real estate | 2024 |
| Liquid Lake Ltd | Arts & recreation | 2024 |
| Lita Scaffolding Ltd | Construction | 2022 |
| Lita Skip Hire Limited | Water & waste | 2026 |
| Little Leaf Nurseries Ltd | Health & social care | 2025 |
| Little Snuggles Ltd | Wholesale & retail | 2024 |
| Livewire Electrical Services Limited | Extraterritorial | 2016 |
| Liyanazcloset Limited | Wholesale & retail | 2025 |
| Lksk Limited | Construction | 2021 |
| Lloydad Property Limited | Professional & scientific | 2011 |
| LNR Performance Remaps Ltd | Information & communication | 2022 |
| Local VEG Hub Limited | Hospitality | 2026 |
| Loft Extension Building & Roofing Ltd. | Construction | 2015 |
| Logikos Accountancy Ltd | Professional & scientific | 2025 |
| Lola P Ltd | Information & communication | 2018 |
| Lola's Garden Services Limited | Administrative & support | 2025 |
| London & Hampshire Investments Limited | Real estate | 1998 |
| London Blacksmith Limited | Other services | 2013 |
| London Cleanerz Limited | Administrative & support | 2022 |
| London Community Contracting Limited | Construction | 2024 |
| London Eco Waste Management Ltd | Water & waste | 2025 |
| London Executive Transfer Ltd | Administrative & support | 2017 |
| London Filming Limited | Information & communication | 2023 |
| London Food Company & Export Limited | Wholesale & retail | 2019 |
| London Glass & Mirrors Ltd | Construction | 2022 |
| London Hotel Drives Ltd | Transport & logistics | 2023 |
| London Knighthood Limited | Manufacturing | 2020 |
| London Luxury Hire Limited | Other services | 2025 |
| London Personal Chauffeur Ltd | Transport & logistics | 2024 |
| London Safe Scaffolding Ltd | Construction | 2017 |
| London SOL Retail Ltd | Wholesale & retail | 2021 |
| London Tours and Travels Limited | Transport & logistics | 2017 |
| London Wings Corporate Ltd | Administrative & support | 2014 |
| Londoners United Ltd | Administrative & support | 2016 |
| Londons Aesthetic Academy Ltd | Other services | 2022 |
| Londres Tavares Ltd | Transport & logistics | 2023 |
| Long VOL Technologies Ltd | Financial services | 2025 |
| Longford Synergy Limited | Real estate | 2023 |
| Loomlux Ltd | Wholesale & retail | 2024 |
| Lootlo Ltd | Real estate | 2020 |
| Lord Construction Limited | Construction | 2019 |
| Lord Investment Group Ltd | Real estate | 2020 |
| Lovin Foot Care Limited | Health & social care | 2025 |
| LRG Decor Limited | Construction | 2021 |
| LS Healthcare Limited | Health & social care | 2023 |
| LSC Technologies Limited | Information & communication | 2015 |
| LTE Trading Ltd | Wholesale & retail | 2020 |
| Luca Transport Inc Ltd | Transport & logistics | 2026 |
| Luca's Projects Ltd | Construction | 2025 |
| Luke 4:18 Ltd | Health & social care | 2024 |
| Lulea Motors Limited | Wholesale & retail | 2024 |
| Lupin Close Management Limited | Households | 1980 |
| Luxaura Products Ltd | Wholesale & retail | 2020 |
| Luxury Design Masters Limited | Construction | 2023 |
| Luxurydoggies Limited | Wholesale & retail | 2022 |
| Luxurylondoncollection Ltd | Wholesale & retail | 2020 |
| Luxvane Ltd | Wholesale & retail | 2026 |
| Luxy Aesthetics Ltd | Other services | 2022 |