| London Paediatric Anaesthesia Group Limited | Health & social care | 2021 |
| London Patient Centre Limited | Health & social care | 2019 |
| London Repromedics Group Ltd | Health & social care | 2025 |
| London Scar Therapy Ltd | Health & social care | 2022 |
| London the Collection Limited | Wholesale & retail | 2018 |
| London Urology Service Ltd | Health & social care | 2009 |
| Londonswissmedical Ltd | Health & social care | 2017 |
| Lone Star Analysis Ltd | Information & communication | 2020 |
| Long Leys Management Company (2007) Limited | Households | 2007 |
| Long Leys Road Management Company Limited | Households | 2006 |
| Longacres (Cherry Willingham) Ltd | Households | 2026 |
| Longdales Court Management Company Limited | Households | 1984 |
| Longdales Digital Consultancy Limited | Information & communication | 2020 |
| Longman Cooling Soloutions Ltd | Construction | 2025 |
| Longwood Quarries Limited | Mining & quarrying | 1941 |
| Lonsdale Wood Flooring Company Limited | Manufacturing | 1996 |
| Look After Yourself LN5 Limited | Health & social care | 2013 |
| Looker Homes Ltd | Extraterritorial | 2018 |
| Looksy Information Technologies UK Limited | Information & communication | 2025 |
| Loom Doctor Limited | Wholesale & retail | 2013 |
| LOOS4U Ltd | Administrative & support | 2022 |
| Lord Trade Limited | Other services | 2023 |
| Lore Creative Limited | Manufacturing | 2009 |
| LOS Geranios Holiday Rentals Ltd | Administrative & support | 2022 |
| Loskope Ltd | Health & social care | 2025 |
| Lottie & LU Ltd | Wholesale & retail | 2019 |
| Lotties Atik Ltd | Wholesale & retail | 2024 |
| Lotus Business Support Ltd | Professional & scientific | 2024 |
| Lotus House Lincoln Ltd | Hospitality | 2024 |
| Lotus Lettings Lincoln Ltd | Real estate | 2017 |
| Lotus Surgicare Limited | Health & social care | 2023 |
| Louise Prop Co Ltd | Real estate | 2021 |
| Louth J V Limited | Real estate | 2013 |
| Louth Park Farms Limited | Agriculture & fishing | 2019 |
| Love for Lincoln Limited | Real estate | 2019 |
| Love Hurts Ltd | Wholesale & retail | 2025 |
| Love Paper Rainbow Ltd | Wholesale & retail | 2018 |
| Love, Mama & Dada Ltd | Extraterritorial | 2025 |
| Loveday Financial Solutions Limited | Professional & scientific | 2020 |
| Loveden Homes Limited | Construction | 2016 |
| Lovediy Limited | Wholesale & retail | 2013 |
| Loven Patents & Trademarks Limited | Administrative & support | 2003 |
| Lovett Electrical Installations Limited | Construction | 2013 |
| Lovett Lawson Estates Limited | Real estate | 2024 |
| LOW Wood Projects Ltd | Construction | 2021 |
| Lowfields Lodges Limited | Hospitality | 2023 |
| Lowlands Holdings Limited | Information & communication | 2019 |
| Lowooke Asset Management Ltd | Construction | 2018 |
| Loxley Collection (TSP Group) Limited | Financial services | 2024 |
| LP Auto Repairs Limited | Wholesale & retail | 2025 |
| LP Fabrications Ltd | Manufacturing | 2013 |
| LP Property Holdings Ltd | Real estate | 2023 |
| Lpaw Ltd | Wholesale & retail | 2025 |
| Lpbc Ltd | Education | 2024 |
| LPE Developments Limited | Real estate | 2016 |
| LPK Financial Solutions Ltd | Professional & scientific | 2026 |
| LPM Commercial Ltd | Real estate | 2025 |
| LPM Investments Ltd | Real estate | 2020 |
| LPM Lincoln Ltd | Real estate | 2017 |
| LPS 001 Ltd | Real estate | 2014 |
| LPS 002 Ltd | Real estate | 2015 |
| LPS 003 Ltd | Real estate | 2015 |
| LPS 004 Ltd | Real estate | 2015 |
| LPS 005 Ltd | Real estate | 2015 |
| LPS 006 Ltd | Real estate | 2017 |
| LPS 007 Ltd | Real estate | 2017 |
| LPS 008 Ltd | Real estate | 2019 |
| LPS 009 Ltd | Real estate | 2019 |
| LRB Property Limited | Real estate | 2023 |
| Lrcj Ltd | Hospitality | 2023 |
| Lrfc Trading Limited | Hospitality | 2016 |
| Lrjb GAS Services Ltd | Construction | 2026 |
| LRK Ingham Ltd | Other services | 2014 |
| LRR Limited | Wholesale & retail | 2017 |
| Lrrl PR Limited | Professional & scientific | 2019 |
| LS Equine Ltd | Administrative & support | 2023 |
| LS Scaffolding (Lincoln) Ltd | Construction | 2020 |
| LS Vehicle Services Ltd | Wholesale & retail | 2022 |
| LSK Ltd | Wholesale & retail | 2015 |
| LSR Projects Ltd | Professional & scientific | 2026 |
| LTS Energy Ltd | Manufacturing | 2015 |
| LTV Autocenter Limited | Wholesale & retail | 2023 |
| Lucas and Hopper Limited | Administrative & support | 2025 |
| Lucas Couriers Limited | Transport & logistics | 2011 |
| Lucerne Estates Limited | Extraterritorial | 1937 |
| Lucid Bespoke Ltd | Health & social care | 2018 |
| Lucid Studios Ltd | Information & communication | 2023 |
| Lukas Marcinkevicius Ltd | Education | 2023 |
| Lukasz Z Ltd | Transport & logistics | 2020 |
| Luke Keefe Fuel Transport Limited | Transport & logistics | 2017 |
| Luke Lewis Ltd | Information & communication | 2019 |
| Lukeparts Ltd | Wholesale & retail | 2025 |
| Luke’S Barbershop Ltd | Other services | 2021 |
| Lukviki Limited | Wholesale & retail | 2024 |
| Lulega Holdings Ltd | Hospitality | 2025 |
| Lulu's Kennels Ltd | Agriculture & fishing | 2026 |
| Luly Holdings Ltd | Financial services | 2022 |
| Lumicraft Studio Limited | Manufacturing | 2025 |
| Luminelle Beauty Ltd | Wholesale & retail | 2026 |
| Luminlore Gems and Jewels Ltd | Wholesale & retail | 2025 |