| Little Florence Bar Ltd | Hospitality | 2023 |
| Little Florence Limited | Real estate | 2017 |
| Little Islanders Childcare Ltd | Administrative & support | 2017 |
| Little Learning Academy Limited | Education | 2017 |
| Little Stars Childrenswear Ltd | Wholesale & retail | 2022 |
| Littlestone House Ltd | Households | 2019 |
| Littoral Publishing Ltd | Information & communication | 2024 |
| Live Innovative Holdings Ltd | Financial services | 2026 |
| Live Music NOW Limited | Arts & recreation | 1977 |
| Live Well Marketing Ltd | Professional & scientific | 2026 |
| Live Well Support Care Limited | Health & social care | 2026 |
| Living Word Ministries UK Ltd | Other services | 2023 |
| Livingstone Realty Ltd | Real estate | 2025 |
| Livtec Services Ltd | Other services | 2024 |
| LJ Kitchens Bathrooms Ltd | Construction | 2015 |
| LJB Carpentry & Property Maintenance Limited | Construction | 2014 |
| LJS Electrical & Fire Ltd | Construction | 2025 |
| LJW Trading Industries Ltd | Manufacturing | 2024 |
| LK Driving School Ltd | Administrative & support | 2025 |
| Lloyd Campbell Consultancy Ltd | Administrative & support | 2022 |
| Lltrm Services Ltd | Construction | 2024 |
| LM Recovery Kent Ltd | Other services | 2023 |
| LMA Consultancy (UK) Ltd | Professional & scientific | 2023 |
| LMC Contracting Limited | Construction | 2022 |
| LMK Logistics Limited | Transport & logistics | 2021 |
| LN Electrical Contractors Ltd | Construction | 2019 |
| LNA14 Limited | Wholesale & retail | 2021 |
| LNH Engineering Ltd | Construction | 2023 |
| Local Lettings Agency Limited | Households | 2022 |
| Lock LAB Ltd | Manufacturing | 2026 |
| Locum Nightingale Limited | Health & social care | 2022 |
| Lofts of Bromley Limited | Construction | 2018 |
| Logan Wimpy Limited | Hospitality | 2023 |
| Logixtech Ltd | Wholesale & retail | 2026 |
| Lolmads Construction Limited | Construction | 2022 |
| Lombard Threadneedle Ltd | Financial services | 2026 |
| London Catering Services (SE) Limited | Hospitality | 2005 |
| London Classic BUS Hire Limited | Administrative & support | 2010 |
| London Dyslexia Network Ltd | Education | 2017 |
| London Elite Medical Ltd | Health & social care | 2019 |
| Londonshadows Ltd | Arts & recreation | 2020 |
| Lone Wolf Carpentry Ltd | Manufacturing | 2024 |
| Longfield Flooring Ltd | Construction | 2018 |
| Longley Services Limited | Construction | 2026 |
| Looby Crean Limited | Professional & scientific | 1999 |
| Look Good Fitness Ltd | Other services | 2023 |
| Look Into My Eyes Ltd | Wholesale & retail | 2020 |
| Lori’S Valeting Services Ltd | Administrative & support | 2022 |
| Lottery England Ltd | Arts & recreation | 2014 |
| Lottus Energy Limited | Energy | 2023 |
| Loudon Wood Management Company Limited | Real estate | 1999 |
| Louis GAS & Heating Ltd | Construction | 2016 |
| Love Variety Limited | Arts & recreation | 2015 |
| Lovellrise Limited | Real estate | 1996 |
| Lovely Carpets Limited | Extraterritorial | 2011 |
| Loveshopboutique Limited | Information & communication | 2022 |
| Lowe Civil Engineering Limited | Construction | 2009 |
| Lowen Blue Limited | Real estate | 2022 |
| Lower Bush Alpacas Ltd | Arts & recreation | 2021 |
| Lower Stoke Take Away Ltd | Hospitality | 2022 |
| Lowkey Security Solutions Ltd | Manufacturing | 2021 |
| Lowry Edwards Developments Limited | Construction | 2021 |
| Lowry Holdco Ltd | Financial services | 2023 |
| Lowther Property Ltd | Real estate | 2021 |
| LP Capital Investments Ltd | Financial services | 2021 |
| Lpmm Business and Property Services Ltd | Real estate | 2017 |
| Lqim Ltd | Administrative & support | 2015 |
| LRD and Daughters Limited | Health & social care | 2023 |
| LRN Engineering Limited | Manufacturing | 2007 |
| LS Welding and Mechanical Services Ltd | Construction | 2026 |
| LSS Contractors Limited | Construction | 2016 |
| Ltse Production Ltd | Administrative & support | 2018 |
| Lucali's Pizza Ltd | Hospitality | 2025 |
| Lucas & Co Financial Planning Ltd | Financial services | 2021 |
| Lucas Arborist Limited | Administrative & support | 2025 |
| Lucas Close Residents Management Company Limited | Real estate | 2020 |
| Lucas Property & Developments Limited | Construction | 2015 |
| Lucky Haul Ltd | Wholesale & retail | 2024 |
| LUI GS Pizza Ltd | Hospitality | 2024 |
| Luke Archer Limited | Manufacturing | 2015 |
| Luke Brodie Limited | Construction | 2017 |
| Lukke Ltd | Transport & logistics | 2026 |
| Luli Properties & DEV. Co. Ltd | Construction | 2025 |
| Lullingstone Garden Design & Maintenance Limited | Administrative & support | 2019 |
| Lullingstone Garden Dwellings Limited | Administrative & support | 2017 |
| Lumatek Ltd | Wholesale & retail | 2010 |
| Lumina Care Ltd | Health & social care | 2025 |
| Luminosity Aesthetics and Wellness Clinic Ltd | Health & social care | 2024 |
| Lumos Electrics Limited | Construction | 2018 |
| Luna Charging Ltd | Other services | 2025 |
| Lusazi Health Travels Limited | Health & social care | 2025 |
| Lusca Ltd | Construction | 2015 |
| Lutkin Supplies Limited | Manufacturing | 2025 |
| Luton (8) Limited | Real estate | 2016 |
| Luttman Electrical Services Ltd | Construction | 2015 |
| LUX Access Scaffolding Ltd | Construction | 2024 |
| LUX Tanz Ltd | Other services | 2025 |
| Luxe Hairdresser's Ltd | Other services | 2023 |
| Luxe Label London Limited | Wholesale & retail | 2026 |
| Luxury Bespoke Interiors Limited | Construction | 2016 |