| London Square Development Management Limited | Construction | 2011 |
| London Square Developments (Holdings) Limited | Financial services | 2014 |
| London Square Developments (Ventures) Limited | Financial services | 2011 |
| London Square Developments Limited | Construction | 2010 |
| London Square Limited | Financial services | 2011 |
| London Square Living Limited | Construction | 2011 |
| London Square Partners Limited | Construction | 2014 |
| London Square PIC Partnership Limited | Construction | 2023 |
| London Square Works Limited | Construction | 2012 |
| London Stone Watford Ltd | Hospitality | 2025 |
| London Thermal Management Ltd | Construction | 2026 |
| London Tiffin Company. Ltd | Hospitality | 2024 |
| London Training and Consultancy Limited | Education | 2023 |
| London VIP Services (UK) Limited | Administrative & support | 2014 |
| London Waste Management Ltd | Water & waste | 2019 |
| London’S Finest Facilities Ltd | Construction | 2022 |
| Londra Transfers Ltd | Transport & logistics | 2023 |
| Long Lane Holding Ltd | Real estate | 2022 |
| Longforn Limited | Administrative & support | 2012 |
| Longmid NO.2 Residents Management Limited | Real estate | 1995 |
| Longreach Holdings Limited | Real estate | 2003 |
| Lonsdale Midlands Limited | Health & social care | 1993 |
| Loop Solutions Holdings Limited | Financial services | 2013 |
| Loop Solutions Limited | Information & communication | 2013 |
| Loop Sustainable Visuals Limited | Professional & scientific | 2023 |
| Loose Goose Kitchen Co. Ltd | Hospitality | 2026 |
| Lopes Tooling Limited | Construction | 2024 |
| Lord Grills Ltd | Hospitality | 2018 |
| Lord Kalvin Ltd | Construction | 2017 |
| Lords Property Partners Limited | Real estate | 2025 |
| Lorikconstruction Ltd | Construction | 2022 |
| Loriks Ltd | Construction | 2013 |
| Lorro Limited | Professional & scientific | 2013 |
| Lotus Facilities Ltd | Real estate | 2016 |
| Louis Scot Property Limited | Construction | 2010 |
| Louton Retail Limited | Wholesale & retail | 2011 |
| Lovato Management Limited | Professional & scientific | 2020 |
| Love's Studio Ltd | Information & communication | 2026 |
| LOVE2PASS Driving School Limited | Education | 2025 |
| LOVE2PASS Limited | Administrative & support | 2012 |
| Lovesingh Logistics Limited | Transport & logistics | 2026 |
| Lowe Aesthetics Ltd | Other services | 2024 |
| Lower Marsh Management Limited | Households | 2015 |
| LOZ Designs Limited | Wholesale & retail | 2013 |
| LPG Property Services Limited | Hospitality | 2011 |
| LPR Construction Limited | Construction | 2016 |
| LRC Commercial Consultancy Ltd | Professional & scientific | 2023 |
| LRR Global Holdings Ltd | Real estate | 2025 |
| Lrre Limited | Real estate | 2024 |
| LS ALL Trades Ltd | Construction | 2025 |
| LS Electrical Services (UK) Ltd | Construction | 2014 |
| LSQ Holdco 2 Limited | Financial services | 2014 |
| LSQ Holdco 3 Limited | Financial services | 2014 |
| LSQ Management Limited | Financial services | 2014 |
| LT Surrey Limited | Education | 2020 |
| Ltek Trading Limited | Wholesale & retail | 2025 |
| Ltfa 1.1 Sports Limited | Arts & recreation | 2026 |
| LTS (99) Limited | Wholesale & retail | 1976 |
| Luan Electrical Contractors Limited | Construction | 2010 |
| Luboss UK Limited | Health & social care | 2018 |
| Lucentonyx Limited | Information & communication | 2020 |
| Lucie Blue Ltd | Real estate | 2021 |
| Lucozade Ribena Suntory Exports Limited | Manufacturing | 2013 |
| Lucozade Ribena Suntory Limited | Manufacturing | 2013 |
| Lucx Limited | Transport & logistics | 2017 |
| Ludlum Systems Limited | Professional & scientific | 2020 |
| LUK Construct Ltd | Construction | 2019 |
| LUK Scaffolding Ltd | Construction | 2016 |
| Luka Construction Ltd | Construction | 2017 |
| Luks Scaffolding Ltd | Construction | 2025 |
| Luksor Ltd | Construction | 2018 |
| Lulu's Crepe Ltd | Hospitality | 2025 |
| Luminare Productions Limited | Information & communication | 2025 |
| Lumière View Ltd | Manufacturing | 2022 |
| Lumora Limited | Professional & scientific | 2002 |
| Lunacres Atelier Limited | Manufacturing | 2022 |
| Luntrix Ltd | Wholesale & retail | 2025 |
| Lupin in London Ltd | Information & communication | 2024 |
| Lush Cleaning Limited | Administrative & support | 2025 |
| LUX Chauffeurs Ltd | Transport & logistics | 2016 |
| Luxcar Services Ltd | Transport & logistics | 2019 |
| Luxe Security Group Limited | Administrative & support | 2023 |
| Luxe Spa Lounge Ltd | Other services | 2025 |
| Luxe Vista Realty Ltd | Real estate | 2024 |
| Luxemaid Ltd | Administrative & support | 2025 |
| Luxmisarees Ltd | Professional & scientific | 2024 |
| Luxora Interiors Ltd | Administrative & support | 2017 |
| Luxuriate Limited | Administrative & support | 2022 |
| Luxury Airport Cars Ltd | Transport & logistics | 2019 |
| Luxury Ride Limited | Transport & logistics | 2024 |
| Luxury Smith Limited | Wholesale & retail | 2017 |
| Luxvilla Development Ltd | Real estate | 2024 |
| Luxx Creatives Limited | Information & communication | 2025 |
| Lvsgb Ltd | Other services | 2026 |
| Lydekaitedovile Ltd | Administrative & support | 2017 |
| LYF Line Express Ltd | Transport & logistics | 2022 |
| Lympex Consulting Limited | Health & social care | 2025 |
| Lyndhurst Psychiatric Residential Care Home Limited | Health & social care | 1994 |
| Lynx Maintenance Limited | Other services | 1997 |
| Lyra International Ltd. | Wholesale & retail | 2021 |