| Logistic Solutions UK & Europe Limited | Transport & logistics | 2008 |
| Logistic Transport Solution Ltd | Transport & logistics | 2015 |
| Logistica Europe Limited | Transport & logistics | 2014 |
| Logistica World Wide Limited | Transport & logistics | 2003 |
| Logistics DSI Ltd | Transport & logistics | 2018 |
| Logistics Made Easy Limited | Professional & scientific | 2016 |
| Logistics Solutions Group Holdings Limited | Financial services | 2024 |
| Logistics Solutions Group Limited | Administrative & support | 2017 |
| Logisticsrex Ltd | Transport & logistics | 2025 |
| Logo Studio Northampton Ltd | Wholesale & retail | 2023 |
| Lohc Construction Limited | Construction | 2004 |
| Lola HQ Ltd | Other services | 2023 |
| Lolimedcare Ltd | Health & social care | 2011 |
| Lollipops Catering Limited | Hospitality | 2025 |
| Lomov Ltd | Construction | 2020 |
| London & Stockholm Properties Limited | Real estate | 1987 |
| London and Thames Estates Ltd | Real estate | 2022 |
| London Baron Ltd | Manufacturing | 2019 |
| London Brick Company Limited | Extraterritorial | 2016 |
| London College of Global Education Ltd. | Administrative & support | 2010 |
| London Compare Limited | Information & communication | 2024 |
| London CRS Ltd | Administrative & support | 2010 |
| London EYE Production House Ltd | Information & communication | 2019 |
| London Fruit & VEG Limited | Wholesale & retail | 2002 |
| London Global Capital Limited | Financial services | 2024 |
| London Land and Property Limited | Real estate | 2020 |
| London Management Training Center Limited | Professional & scientific | 2018 |
| London Plane Clothing Ltd | Wholesale & retail | 2025 |
| London Prestige Joinery Ltd | Construction | 2017 |
| Londonguild Services Ltd | Construction | 2008 |
| Lone Logistics Limited | Transport & logistics | 2020 |
| Lone Pine Management Company Limited | Households | 1981 |
| Lonewolf Global Ltd | Wholesale & retail | 2025 |
| Long & Partners Commissioning Consultancy Limited | Professional & scientific | 2002 |
| Long Ashton PUB Dining Limited | Hospitality | 2007 |
| Long Buckby RFC Social Club Limited | Arts & recreation | 2025 |
| Longbrook Construction Limited | Construction | 2012 |
| Longhorn Holdings Limited | Real estate | 2022 |
| Longthorne (Gunmakers) Limited | Wholesale & retail | 2010 |
| Longthorne Group Limited | Professional & scientific | 2019 |
| Longthorne Properties Limited | Real estate | 2014 |
| LOOK2GO Driving School Ltd | Education | 2025 |
| Looking Glass Books Ltd | Wholesale & retail | 2022 |
| Looks Divine Gift Ltd | Wholesale & retail | 2024 |
| Loom & Weave Ltd | Wholesale & retail | 2025 |
| Loomes Estates Ltd | Real estate | 2025 |
| Loomes PUB Ltd | Hospitality | 2023 |
| Loomvera Limited | Wholesale & retail | 2026 |
| Loop Holdings Ltd | Financial services | 2021 |
| Loop Software Group Ltd | Information & communication | 2020 |
| Loopav Ltd | Arts & recreation | 2018 |
| Lopii Ltd | Construction | 2012 |
| Lord Design Limited | Manufacturing | 2013 |
| Lord Devonshire Construction Limited | Professional & scientific | 2016 |
| Lord Operations Ltd | Construction | 2023 |
| Lorenzey Ltd | Wholesale & retail | 2026 |
| Lorex GAB Limited | Construction | 2014 |
| Lorin London Ltd | Hospitality | 2018 |
| Lorinat Healthcare Ltd | Health & social care | 2020 |
| Lormar Limited | Real estate | 2019 |
| Loroma UK Limited | Transport & logistics | 2018 |
| Lorraine Lewis Limited | Professional & scientific | 2023 |
| Lorrengee Ltd | Administrative & support | 2020 |
| Lorry Transport Limited | Transport & logistics | 2015 |
| Loryn Ltd | Professional & scientific | 2025 |
| LOS Cubanos Hermanos Limited | Hospitality | 2024 |
| Loshak Studios Limited | Manufacturing | 2024 |
| Lost the Plot Limited | Professional & scientific | 2021 |
| Lotcompete Ltd | Information & communication | 2019 |
| Lotso Limited | Professional & scientific | 2020 |
| Lottie Luvs Ltd | Wholesale & retail | 2025 |
| Lotus Homes for Children Limited | Health & social care | 2024 |
| Lotus Two Limited | Other services | 2017 |
| Loubser Lodges Ltd | Administrative & support | 2018 |
| Loughton Tyres Limited | Wholesale & retail | 1987 |
| Louiesa Ltd | Health & social care | 2022 |
| Louis Hugo Limited | Wholesale & retail | 2025 |
| Louise Ward Integrative Therapy Ltd | Health & social care | 2025 |
| Louisetat Ltd | Wholesale & retail | 2024 |
| Loulita Ltd | Other services | 2024 |
| Louvanne Consultancy Limited | Information & communication | 2012 |
| Lovag Ltd | Administrative & support | 2026 |
| Lovatt Transport Limited | Transport & logistics | 2011 |
| Love IT Pizza Co Ltd | Hospitality | 2023 |
| Love Local Northampton Ltd | Information & communication | 2025 |
| Love My Space Ltd | Real estate | 2021 |
| Lovecare Empowering Homecare Services Limited | Health & social care | 2015 |
| Lovedale Homes Midlands Limited | Health & social care | 2023 |
| Lovedon Estates LLP | | 2022 |
| Lovedon Estates UK Ltd | Real estate | 2025 |
| Lovejoy Catering and Events Ltd | Hospitality | 2020 |
| Lovelace Hospitality Ltd | Hospitality | 2026 |
| Lovely Creative Ltd | Professional & scientific | 2012 |
| Lovely Design Limited | Professional & scientific | 2011 |
| Lovely Rose Care Services Limited | Health & social care | 2011 |
| Lovemore Music (UK) Limited | Administrative & support | 1999 |
| Loveridge & SON Limited | Hospitality | 2015 |
| Lovesmith Ltd | Professional & scientific | 2025 |
| Loveworld Northampton Ltd | Health & social care | 2021 |
| Loving Care Agency Ltd | Health & social care | 2020 |