| London Car Parking Ltd | Administrative & support | 1972 |
| London Care Partnership (Supported Living) Limited | Construction | 2013 |
| London Care Partnership Community Care Services Limited | Extraterritorial | 2011 |
| London Centre for Prosthodontics Limited | Health & social care | 2012 |
| London Cleaning Ltd | Administrative & support | 2004 |
| London Code.Mb Ltd | Wholesale & retail | 2017 |
| London Concrete Pumping Limited | Administrative & support | 2010 |
| London Core Construction Ltd | Construction | 2023 |
| London Eccountant Ltd | Professional & scientific | 2018 |
| London Electrical Cabling Limited | Construction | 2017 |
| London Elstree Aviation Ltd | Manufacturing | 1998 |
| London Exclusive Design Limited | Other services | 2004 |
| London GAS Certs Ltd | Construction | 2018 |
| London Gases Limited | Wholesale & retail | 2010 |
| London Green (Warple Way) Limited | Real estate | 2015 |
| London Helicopters Elstree Limited | Manufacturing | 2019 |
| London HIP & Knee Ltd | Health & social care | 2014 |
| London Homebuyers Limited | Construction | 2011 |
| London House U.K Ltd | Real estate | 2013 |
| London Implant Services Limited | Health & social care | 2022 |
| London Kent Flooring Limited | Construction | 2017 |
| London Lions Foundation | Other services | 2023 |
| London Pain Medicine Ltd | Health & social care | 2012 |
| London Perinatal Psychiatry Limited | Health & social care | 2022 |
| London Pest Solutions Limited | Other services | 2007 |
| London Pharma & Chemicals Group Ltd | Professional & scientific | 2003 |
| London Pharma & Chemicals Holdings Ltd | Professional & scientific | 2009 |
| London Phone Company Two Ltd | Wholesale & retail | 2018 |
| London Premier Laser Clinic W2 Limited | Other services | 2009 |
| London Refrigeration and Air Conditioning Limited | Manufacturing | 1997 |
| London Rock (Midlands) Ltd | Construction | 2020 |
| London Rock (Southern) Limited | Wholesale & retail | 1997 |
| London Rock Group Ltd | Construction | 2020 |
| London Rock Supplies Limited | Administrative & support | 1996 |
| London Scaffolding Solutions Ltd | Construction | 2020 |
| London School of Flying Limited | Arts & recreation | 2012 |
| London Schools Consultancy Limited | Education | 2014 |
| London Serviced Offices Limited | Real estate | 2016 |
| London Stairs Limited | Manufacturing | 2011 |
| London Tower Crane Hire & Sales Limited | Administrative & support | 2003 |
| London Urgent Care Academy Ltd | Health & social care | 2018 |
| London W1 Analytics Ltd | Information & communication | 2018 |
| LONDONACCOMMODATION4U Limited | Real estate | 2011 |
| Londonhealthconsult Ltd | Professional & scientific | 2014 |
| Lone Ranger Limited | Arts & recreation | 2019 |
| Lonepart Ltd | Professional & scientific | 2023 |
| Lonestar TV Productions Limited | Information & communication | 2005 |
| Long Acre (Whetstone) Management Company Limited | Households | 1990 |
| Long Island Studios Ltd | Information & communication | 2006 |
| Long Range Labs Limited | Arts & recreation | 2026 |
| Longthorne Limited | Manufacturing | 1995 |
| Lonut Ltd | Public administration | 2019 |
| Look Lovely Ltd | Wholesale & retail | 2021 |
| Lookingforcarpark Ltd | Construction | 2019 |
| Loop+Electrical Limited | Construction | 2020 |
| Lotcor Prop Ltd | Administrative & support | 2025 |
| Lotex Accounting Services Ltd | Professional & scientific | 2003 |
| Lotly Ltd | Real estate | 2025 |
| Loughlin Civil Engineering Limited | Professional & scientific | 1999 |
| Loughlin London Holdings Limited | Financial services | 2024 |
| Loughlin Properties Limited | Real estate | 2024 |
| Louis Butler Ltd | Construction | 2019 |
| Louis Cooper Limited | Administrative & support | 2020 |
| Louisa Analytics Limited | Extraterritorial | 2022 |
| Lova Services Ltd | Wholesale & retail | 2025 |
| Love Light Energy Ltd | Other services | 2025 |
| Love&Care Limited | Health & social care | 2021 |
| Loveb Films Limited | Information & communication | 2011 |
| Lovegyms Limited | Arts & recreation | 2025 |
| Loveridge Project Management Ltd | Construction | 2020 |
| Loveworld Birm UKZ1 Ltd | Other services | 2022 |
| LOW Carb Kosher Limited | Professional & scientific | 2008 |
| Lower Dens Hotel Services (Dundee) Limited | Hospitality | 2014 |
| Lowther Close 26/01/1966 Limited | Extraterritorial | 2014 |
| Lowther Property Finders Limited | Real estate | 2015 |
| Lpcm Consultancy Limited | Professional & scientific | 2026 |
| Lplc Holdings Limited | Financial services | 2017 |
| Lpst Ltd | Wholesale & retail | 2024 |
| LQD Limited | Health & social care | 2020 |
| LRC Grips Limited | Information & communication | 2013 |
| LS Gelati Limited | Professional & scientific | 2025 |
| LS Kitchen Catering Limited | Hospitality | 2025 |
| Lsan Limited | Professional & scientific | 2018 |
| LSG Websites Limited | Information & communication | 2022 |
| LSR Storage Limited | Other services | 2014 |
| LSS Property Ltd | Real estate | 2019 |
| LST Contracts Services Ltd | Construction | 2022 |
| LSW Essex Ltd | Construction | 2017 |
| LT Group | Real estate | 2016 |
| Lubbock Properties Ltd | Real estate | 2023 |
| Lucafirst Limited | Hospitality | 2024 |
| Luckylux Ltd | Transport & logistics | 2025 |
| Luftraf Limited | Transport & logistics | 2017 |
| Luka Lucian Ltd | Construction | 2016 |
| Lukas Matei Ltd | Construction | 2022 |
| Luke & SON Property Improvements Ltd | Construction | 2024 |
| Luli Plumbing & Heating Ltd | Construction | 2019 |
| Lumalux Ltd | Information & communication | 2010 |
| Lumariq Ltd | Wholesale & retail | 2025 |
| Lumiere 72 Limited | Professional & scientific | 2018 |