| Little Orchard Property Management Ltd | Real estate | 2020 |
| Little Sicily (UK) Ltd | Hospitality | 2016 |
| LJ Specialized Services Limited | Administrative & support | 2017 |
| Llshare Ltd | Real estate | 2024 |
| LN Build Maintenance Ltd | Construction | 2022 |
| Lncn Solutions Limited | Professional & scientific | 2017 |
| LO PAN Limited | Wholesale & retail | 2006 |
| Local Brothers Ltd | Wholesale & retail | 2026 |
| Local Web Life Ltd | Information & communication | 2009 |
| Lock Properties Ltd | Real estate | 2025 |
| Lock Property Holdings Ltd | Financial services | 2024 |
| Locker Room Sports Ltd | Professional & scientific | 2023 |
| Locket Road Limited | Real estate | 2025 |
| Loco Cubana Ltd | Hospitality | 2024 |
| Loco Weston Ltd | Hospitality | 2024 |
| Logic Homes Limited | Construction | 2004 |
| Logic Stevenage LLP | | 2009 |
| Lojy Air UK Limited | Transport & logistics | 2014 |
| Loladebolade Consultancy Services Ltd | Health & social care | 2015 |
| Lomas Design Ltd | Wholesale & retail | 2026 |
| London City Merchant Ltd | Construction | 2014 |
| London Copy Centre Ltd | Administrative & support | 2002 |
| London Furniture Outlet Limited | Other services | 2019 |
| London Groundworks Ltd | Construction | 2016 |
| London Materials Limited | Construction | 2003 |
| London Plastering and Painting Ltd | Construction | 2015 |
| London Recycled Furniture Limited | Wholesale & retail | 2019 |
| London Team Building Services Ltd | Construction | 2014 |
| London Waste OIL Ltd | Water & waste | 2022 |
| Londoneventscorp Limited | Hospitality | 2023 |
| Longest Drive Ltd | Information & communication | 2024 |
| Look Scaffold Limited | Construction | 2019 |
| Look Scaffolding Limited | Construction | 2019 |
| Losh Restaurant Ltd | Hospitality | 2024 |
| Loudeano Limited | Hospitality | 2009 |
| Louie River Developments Limited | Construction | 2021 |
| Louie Sandwich Bar of Nazeing Limited | Hospitality | 2022 |
| Louis J O'Regan Limited | Construction | 2023 |
| Love Dimensions Limited | Education | 2021 |
| Love Hobbs Sound Ltd | Information & communication | 2023 |
| Love Markets Limited | Wholesale & retail | 2024 |
| Lovemacun UK Ltd | Hospitality | 2025 |
| Lowfield Court Management Company Limited | Administrative & support | 1998 |
| Lowww Limited | Professional & scientific | 2014 |
| Loyal Legal Experts Limited | Professional & scientific | 2021 |
| LPN Building Services Ltd | Construction | 2015 |
| LRJ Homes Ltd | Construction | 2020 |
| LSC Property Maintenance Ltd | Construction | 2021 |
| LSS Skip Hire Limited | Water & waste | 2025 |
| LTC Advisory Limited | Financial services | 2025 |
| LTS Recovery Ltd | Transport & logistics | 2023 |
| Lucas Lane and Grays Lane Residents Management Company Limited | Households | 2026 |
| Lukaria Group Ltd | Professional & scientific | 2025 |
| Lunamare Limited | Information & communication | 2023 |
| Lunar Blinds Ltd | Wholesale & retail | 2015 |
| Lunarocc Properties Ltd | Real estate | 2024 |
| Luvem Ltd | Information & communication | 2021 |
| LUX Aesthetics Clinic Ltd | Other services | 2021 |
| LUX Skin Clinic Ltd | Other services | 2021 |
| Luxmar Project Ltd | Construction | 2024 |
| Luxoria Home Fragrance Oils Ltd | Wholesale & retail | 2025 |
| LXR Construction Ltd | Construction | 2020 |
| LYN Roofing & Waterproofing Ltd | Construction | 2026 |
| L’Archive Limited | Wholesale & retail | 2022 |
| M & a Hatfield Limited | Real estate | 2016 |
| M & S Barbers Limited | Other services | 2022 |
| M a D Group Ltd | Transport & logistics | 2021 |
| M B S Civils Ltd | Construction | 2016 |
| M B S Construction Ltd | Construction | 2012 |
| M B S Group Holdings Ltd | Financial services | 2016 |
| M B S Plant Ltd | Administrative & support | 2016 |
| M Brothers Logistics Ltd | Transport & logistics | 2021 |
| M Cressey Developments Limited | Construction | 2023 |
| M Helan Limited | Hospitality | 2022 |
| M J Controls Limited | Information & communication | 2017 |
| M J Dooley Construction Ltd | Construction | 2015 |
| M Nursery Limited | Real estate | 2021 |
| M Repairs and Recovery Ltd | Wholesale & retail | 2020 |
| M.B. Property Managment Ltd | Real estate | 2022 |
| M.I.S Constructions and Development Limited | Construction | 2020 |
| M.S.R Construction Limited | Construction | 2018 |
| Maace Limited | Wholesale & retail | 2015 |
| MAC Engineering Ltd | Construction | 2023 |
| Maccob Limited | Administrative & support | 2024 |
| Macob Limited | Professional & scientific | 2024 |
| Macobi Limited | Administrative & support | 2024 |
| Made by Love Cakes Ltd | Wholesale & retail | 2025 |
| Madinah Shawarma Limited | Hospitality | 2022 |
| Magic 23 Limited | Hospitality | 2023 |
| Magic Media Limited | Construction | 2005 |
| Main Character Books Limited | Wholesale & retail | 2025 |
| Maison Carletto Limited | Manufacturing | 2026 |
| Make-Up on Screen Limited | Administrative & support | 2014 |
| Making Magic Records Ltd | Information & communication | 2022 |
| Makro Trading Limited | Administrative & support | 2022 |
| Maks Homes Ltd | Real estate | 2024 |
| Malalai Mozhi Ltd | Education | 2022 |
| Maloa Ltd | Wholesale & retail | 2024 |
| Malton Consultancy Limited | Professional & scientific | 2026 |
| Mama Rules Limited | Wholesale & retail | 2016 |