| Legacy Design LLP | | 2022 |
| Legacy Pets (Holdings) Limited | Real estate | 2020 |
| Legacy Pets Cremation Services Limited | Other services | 2020 |
| Legal Brokers Limited | Professional & scientific | 2004 |
| Legal Drive Hire Limited | Professional & scientific | 1995 |
| Legatum Legal Limited | Financial services | 2025 |
| Legends 7 Ltd | Arts & recreation | 2016 |
| Legends Dance Academy Limited | Arts & recreation | 2020 |
| Leicester Printing Services Ltd | Manufacturing | 2013 |
| Leighton Kelsall Limited | Information & communication | 2021 |
| Leith Wholesale Ltd | Wholesale & retail | 2025 |
| Lesleys Lodges Ltd | Households | 2024 |
| Let's GET Wired Electricals Limited | Construction | 2016 |
| Letkey Homes Limited | Real estate | 2026 |
| Lets Manage Commercial Ltd | Real estate | 2026 |
| Lets MOW Limited | Administrative & support | 2012 |
| Lev-Testing-Uk Ltd | Energy | 2024 |
| Levclad Ltd | Construction | 2025 |
| Level C Limited | Professional & scientific | 2009 |
| Leveltech Limited | Extraterritorial | 1989 |
| Leveraged Solutions Limited | Professional & scientific | 2009 |
| Levy Property Company (UK) Limited | Administrative & support | 2016 |
| Lewmach Limited | Construction | 2024 |
| Leybel Diamonds Limited | Wholesale & retail | 2024 |
| LG Contract Services Limited | Administrative & support | 2023 |
| Lg's Butties Ltd | Hospitality | 2024 |
| Lgkuk Ltd | Hospitality | 2025 |
| LH Heating & Plumbing Ltd | Construction | 2024 |
| Lhbs Supplies Ltd | Wholesale & retail | 2025 |
| LHM Estates Limited | Real estate | 2002 |
| Lhra Ltd | Professional & scientific | 2025 |
| LIB Engineering Ltd | Manufacturing | 2021 |
| Libero Limited | Professional & scientific | 1990 |
| Libero Sport Limited | Administrative & support | 1998 |
| Libero U.K Ltd | Information & communication | 2019 |
| Liberty & Co Healthcare Group Ltd | Health & social care | 2022 |
| Lida Hair and Makeup Academy Ltd | Other services | 2020 |
| Life Beyond the Streets CIC | Education | 2025 |
| Life Bowstar Ltd | Other services | 2018 |
| Life Health & Beauty Limited | Manufacturing | 2017 |
| Life Store Ramsbottom Ltd | Wholesale & retail | 2019 |
| Lifestyle Property Block Management Ltd | Households | 2020 |
| Lifestyle Sales and Lettings Ltd | Administrative & support | 2005 |
| Lifetime Financial Success Limited | Financial services | 2011 |
| Lifeworld Approach to Occupational Therapy Services Limited | Health & social care | 2014 |
| Lift Hold & Separate Ltd | Administrative & support | 2003 |
| Lift Services Limited | Administrative & support | 1990 |
| Liftech Group Ltd | Manufacturing | 2022 |
| Light Bringer Limited | Information & communication | 2025 |
| Light Load Haulage Ltd | Transport & logistics | 2025 |
| Lighting & Building Services Limited | Construction | 2004 |
| LIH Leasing - Investment &Trading Ltd | Financial services | 2012 |
| Lily Gabriel Holdings Limited | Financial services | 2026 |
| Lilywalker Ltd | Wholesale & retail | 2018 |
| Limefield Car Sales Ltd | Wholesale & retail | 2026 |
| Limefield Group Holdings Limited | Financial services | 2026 |
| Limefield Transport Services Ltd | Transport & logistics | 2026 |
| Limestead Limited | Other services | 1985 |
| Lincoln Harry Jones Ltd | Real estate | 2025 |
| Lindsay Court (ST Annes) RTM Company Limited | Households | 2017 |
| Lindsay Sutton Press & P.R. Ltd | Administrative & support | 2003 |
| Linen Residences Limited | Real estate | 2024 |
| Lingard Property Management Ltd | Real estate | 2016 |
| Liodoir Limited | Professional & scientific | 2023 |
| Lion Guard Security (LGS) Limited | Administrative & support | 2023 |
| Lion Waste Services Ltd | Water & waste | 2017 |
| Lion&Sun Investments Ltd | Real estate | 2026 |
| Lions Inn Indian Cuisine Ltd | Hospitality | 2019 |
| Liquid Property Partnership Ltd | Real estate | 2017 |
| Liquidator NW Ltd | Wholesale & retail | 2024 |
| Lisa Maynard-Atem Consultancy Limited | Professional & scientific | 2022 |
| Literacy Shed Publishing Ltd | Information & communication | 2025 |
| Little Cullum Consultancy Limited | Professional & scientific | 2025 |
| Little GEM Stays Ltd | Real estate | 2019 |
| Little Upgrades Ltd | Wholesale & retail | 2026 |
| Little Van Collective Ltd | Hospitality | 2025 |
| Littlerspoint Ltd | Hospitality | 2019 |
| Live Connexions Ltd | Wholesale & retail | 2006 |
| Live on Aire Ltd | Administrative & support | 2023 |
| Living Bread Health Care Ltd | Administrative & support | 2023 |
| Livingart Management Limited | Real estate | 2007 |
| Livingstones Designs Ltd | Wholesale & retail | 2025 |
| Lizziz for Hair Ltd | Other services | 2010 |
| LJ Auto Care Ltd | Wholesale & retail | 2026 |
| LJ Flow Ltd | Construction | 2023 |
| LJ Motorways Ltd | Construction | 2020 |
| LJB Abodes Ltd | Real estate | 2023 |
| LJB Freelance Ltd | Information & communication | 2018 |
| Ljnc House Limited | Real estate | 2026 |
| Ljnc Ltd | Real estate | 2025 |
| LJS Butties Ltd | Administrative & support | 2016 |
| LK Property Partners Ltd | Real estate | 2019 |
| LKO Content Creation Ltd | Information & communication | 2025 |
| LLN Estates Limited | Real estate | 2017 |
| Llna Financial Limited | Financial services | 2025 |
| Lloyd Carson Associates Ltd | Professional & scientific | 2011 |
| Lloyd Property & Lettings Ltd | Real estate | 2018 |
| LLP Anpz (Atyrau OIL Refinery) Ltd | Other services | 2025 |
| LMF Pipework Services Ltd | Manufacturing | 2026 |
| LMG Portfolio Ltd | Real estate | 2026 |