| Lizey Limited | Wholesale & retail | 2026 |
| LJA Investments Limited | Real estate | 2015 |
| LJM Resources Ltd | Administrative & support | 2025 |
| Ljmercer Ltd | Construction | 2018 |
| LK Clearance Ltd | Water & waste | 2025 |
| LL Express Limited | Wholesale & retail | 2016 |
| LL Healthcare Services Ltd | Health & social care | 2024 |
| LL Nails and Beauty Limited | Other services | 2023 |
| LL Trade Ltd | Wholesale & retail | 2025 |
| Llari Transport Ltd | Transport & logistics | 2023 |
| Llewellyn Utility Services Ltd | Construction | 2023 |
| LM & New Cleaner Services Limited | Administrative & support | 2024 |
| LMC Contracts Ltd | Construction | 2005 |
| LMD Beauty Ltd | Other services | 2021 |
| LN Nails Company Limited | Other services | 2023 |
| LNE Power Ltd | Construction | 2013 |
| LNE Services Ltd | Wholesale & retail | 2022 |
| LOA Property Ltd | Real estate | 2021 |
| Loaded Chicken Ponders END Limited | Hospitality | 2026 |
| Loaded Sky Ltd | Construction | 2024 |
| Local Cars & Courier Limited | Transport & logistics | 2025 |
| Local Gardening and Landscaping London Ltd | Administrative & support | 2025 |
| Local Inc Limited | Wholesale & retail | 2022 |
| Location Estates Limited | Real estate | 2002 |
| Locks and Co Limited | Other services | 2019 |
| Lodgeable Limited | Real estate | 2025 |
| Logic Build Limited | Construction | 2012 |
| Logic Estates London Ltd | Real estate | 2023 |
| Logix Technology Ltd | Information & communication | 2022 |
| Logixx Ltd | Information & communication | 2017 |
| Lois Sika Hair Bar Limited | Other services | 2020 |
| LOLINGODIGITAL2011 Ltd | Professional & scientific | 2011 |
| Lollipop Nails & Beauty Limited | Other services | 2023 |
| London & Partners Autosport Ltd | Wholesale & retail | 2011 |
| London ADR Limited | Professional & scientific | 2013 |
| London Audiology Clinic Limited | Health & social care | 2015 |
| London Baithead Ltd | Wholesale & retail | 2025 |
| London Boat Party Events Ltd | Arts & recreation | 2018 |
| London Boiler Services Ltd | Construction | 2020 |
| London Bridge Apartments Ltd | Hospitality | 2023 |
| London Care Academy Limited | Education | 2021 |
| London Care Homes Limited | Education | 2007 |
| London City Club Ltd | Manufacturing | 2022 |
| London Colney Football Club Limited | Construction | 2018 |
| London Community Finance Limited | Financial services | 2009 |
| London Corporate Living Limited | Real estate | 2003 |
| London Crash Repairs Ltd | Wholesale & retail | 2023 |
| London Drain Clear Limited | Water & waste | 2011 |
| London Electric Build Ltd | Construction | 2025 |
| London Electrical Team Ltd | Construction | 2020 |
| London Enterprise Club Limited | Other services | 1997 |
| London EYE Home Textiles Limited | Wholesale & retail | 2006 |
| London HA8 Ltd | Hospitality | 2022 |
| London Homes Insullation Ltd | Construction | 2023 |
| London Investment and Finance Ltd | Real estate | 2012 |
| London Lane Development Limited | Construction | 2021 |
| London Lane Management Ltd | Households | 2026 |
| London LET Inventories Ltd | Administrative & support | 2012 |
| London LUX Chauffeurs Ltd | Transport & logistics | 2025 |
| London Luxxe Limited | Other services | 2020 |
| London NW11 Ltd | Hospitality | 2022 |
| London NW4 Ltd | Hospitality | 2022 |
| London Office Search Ltd | Real estate | 2021 |
| London OIL Ltd | Water & waste | 2021 |
| London Ology Ltd | Extraterritorial | 2025 |
| London Padel Ltd | Arts & recreation | 2024 |
| London Pallet Limited | Transport & logistics | 2021 |
| London Parks and Green Spaces Forum | Other services | 2013 |
| London Private Hire Vehicle Rental Ltd | Administrative & support | 2015 |
| London Roots Limited | Other services | 2020 |
| London Skills Centre CIC | Education | 2021 |
| London Stone Steps and Paving Limited | Other services | 2015 |
| London Stonemasonry Limited | Manufacturing | 2013 |
| London Table and Chair Limited | Wholesale & retail | 2015 |
| London Tyres Limited | Wholesale & retail | 2015 |
| London UP Solutions Ltd | Wholesale & retail | 2022 |
| London View Property Services Limited | Real estate | 2025 |
| London Watersports Ltd | Education | 2025 |
| London West Removals Ltd | Transport & logistics | 2023 |
| Londoner Kebabs Ltd | Hospitality | 2018 |
| Londonschoolofdriving Limited | Other services | 2009 |
| Londra Limited | Real estate | 2012 |
| Lonely Goat Limited | Other services | 2000 |
| Longacre Hall Residents Company Limited | Households | 2007 |
| Loni Building Ltd | Construction | 2025 |
| Lonsdale Transport Limited | Transport & logistics | 2025 |
| Lonsdale Wood Limited | Households | 2002 |
| Lonsi Construction Ltd | Construction | 2016 |
| Look 5 Limited | Professional & scientific | 2009 |
| Lootop Cooling Systems Ltd | Construction | 2019 |
| Lopes Cleaning Services Ltd | Administrative & support | 2018 |
| Lopok Ltd | Manufacturing | 2026 |
| Lord Baptiste Management and Consultancy Ltd | Arts & recreation | 2014 |
| Lord's Security Ltd | Administrative & support | 2013 |
| Lords Property Lettings Ltd | Real estate | 2015 |
| Lordsdoing Ltd | Hospitality | 2017 |
| Lordship Consultants Limited | Administrative & support | 1996 |
| Lordship RD Limited | Real estate | 2021 |
| Lordship RD Management Limited | Real estate | 2021 |
| Lost in Dubai Limited | Wholesale & retail | 2025 |