| Lion Real Estate Ltd | Construction | 2020 |
| Lions Productions Ltd | Information & communication | 2021 |
| Lipscomb Cars | | 1997 |
| Lipski MDL Ltd | Transport & logistics | 2025 |
| Listech Ltd | Information & communication | 2026 |
| Literally Public Relations Limited | Information & communication | 2013 |
| Literati Hub Ltd | Education | 2026 |
| Lithecat Holdings Limited | Real estate | 2002 |
| Lithecat Properties Limited | Real estate | 1960 |
| Lithography Equipment Support Ltd | Wholesale & retail | 2012 |
| Litl. Limited | Professional & scientific | 2024 |
| Little Bold Design Limited | Financial services | 2021 |
| Little Derringstone Farm Ltd | Agriculture & fishing | 1996 |
| Little Eaton Properties Limited | Real estate | 2024 |
| Little Goldwell Property Company Limited | Hospitality | 2010 |
| Little Hare Plain Ltd | Real estate | 2016 |
| Little Land Ltd | Arts & recreation | 2023 |
| Little Learners Playgroup Limited | Education | 2015 |
| Little London (Horses) Limited | Agriculture & fishing | 1967 |
| Little Nest Property Ltd | Real estate | 2021 |
| Little Purple Unicorn Ltd. | Wholesale & retail | 2016 |
| Little Red Project Solutions Ltd | Information & communication | 2017 |
| Little Shop of Limited | Wholesale & retail | 2012 |
| Little Treacle’S Nursery Ltd | Education | 2023 |
| Littleholme Property Investments Limited | Real estate | 2003 |
| LIV Well Group Limited | Construction | 2025 |
| LIV Well Homes Ltd | Construction | 2024 |
| LIV Well Interiors Limited | Construction | 2025 |
| Live in Well Limited | Health & social care | 2020 |
| Live Your Dream Network Ltd | Wholesale & retail | 2019 |
| Livestock Productions Ltd | Professional & scientific | 2008 |
| Living Adventure Ltd | Wholesale & retail | 2025 |
| Living in Vogue Ltd | Wholesale & retail | 2012 |
| Living Waters Ministries Ltd | Other services | 2026 |
| Livingwoods Limited | Extraterritorial | 2024 |
| Livingzone Limited | Administrative & support | 1999 |
| Livvy's Lifeline Limited | Information & communication | 2023 |
| Livwell Contracts Limited | Construction | 2024 |
| Livwell Medical Solutions PVT Ltd | Health & social care | 2022 |
| LIZ Jeanes Interiors Ltd | Professional & scientific | 2012 |
| LJ Investment Properties Limited | Real estate | 2024 |
| LJ Whetlor Holiday Letting Ltd | Hospitality | 2021 |
| LJD Civils & Cabling Ltd | Construction | 2020 |
| LJD Civils Holdings Limited | Real estate | 2024 |
| LJK63 Ltd | Real estate | 2016 |
| Ljlc Ltd | Real estate | 2018 |
| LJR Transport Logistics Ltd | Transport & logistics | 2026 |
| LJW Developments (Broadstairs) Limited | Construction | 2006 |
| LJW Developments (Two Doves) Limited | Professional & scientific | 2018 |
| LJW Developments Limited | Construction | 2007 |
| LK Home Engineering Ltd | Real estate | 2020 |
| LKY7 Trading Sports Nutrition & Cycling Limited | Wholesale & retail | 2025 |
| Llabung Limited | Real estate | 2025 |
| LLL Build Ltd | Construction | 2014 |
| Lloris Limited | Health & social care | 2023 |
| Lloyd Productions Ltd | Information & communication | 2023 |
| Llrg Properties Limited | Real estate | 2009 |
| LLS Property Holding Limited | Real estate | 2026 |
| Llyd Group Ltd | Wholesale & retail | 2013 |
| LMB Signalling Limited | Professional & scientific | 2013 |
| LMC Electricians Limited | Construction | 2025 |
| LMC Mortgages Limited | Financial services | 2017 |
| LMH Rail Ltd | Construction | 2014 |
| LMI Carpentry Ltd | Construction | 2021 |
| Lmmtrading Ltd | Wholesale & retail | 2026 |
| LMR Projects Ltd | Manufacturing | 2018 |
| LMT Rail and Civil Engineering Ltd | Professional & scientific | 2021 |
| LNB Building Solutions Ltd | Construction | 2010 |
| Loaded Global UK Ltd. | Wholesale & retail | 2019 |
| Loaf Cafe Patisserie Ltd | Hospitality | 2026 |
| Lobster Leisure Ltd | Education | 2022 |
| Local Branch Ltd | Administrative & support | 2024 |
| Lochside Thistle Limited | Professional & scientific | 2025 |
| Lock Tight Maintenance Limited | Households | 2017 |
| Locket Road NO 13 Limited | Households | 2006 |
| Lockgrange Limited | Professional & scientific | 2005 |
| Lockwood Lettings and Management Limited | Extraterritorial | 2010 |
| Locma Ventures Ltd | Real estate | 2025 |
| Locus Standi Limited | Information & communication | 2012 |
| Lofee LOU Limited | Real estate | 2013 |
| Loftsmith Ltd | Construction | 2022 |
| Lofty Ambitions Ltd | Construction | 2022 |
| Lofty Learning & Development Ltd | Education | 2025 |
| Loga Agency LLP | | 2025 |
| Loggia Holding Ltd | Administrative & support | 2024 |
| Logic Digital Limited | Information & communication | 2026 |
| Login Services Ltd | Administrative & support | 2021 |
| Logistical Consultancy Services Limited | Other services | 2008 |
| Logobrite Limited | Wholesale & retail | 2010 |
| Logun Assets Ltd | Professional & scientific | 2024 |
| Lohorung Property Ltd | Real estate | 2022 |
| London Airport Cars Ltd | Extraterritorial | 2015 |
| London AU Services Ltd | Wholesale & retail | 2022 |
| London Bethersden Limited | Wholesale & retail | 2014 |
| London Bricks Lettings Ltd | Real estate | 2021 |
| London Bridge Electricians Limited | Construction | 2014 |
| London Catwalk Limited | Professional & scientific | 1992 |
| London Concierge & Taxi Services Ltd | Other services | 2021 |
| London Cosmopolitan Drinks Limited | Manufacturing | 2003 |
| London Demolition & Dismantling Ltd. | Construction | 2018 |