| Lloyd Wells Mortgages Ltd | Financial services | 2019 |
| Lloyd-Simmons Trading Limited | Administrative & support | 2025 |
| Lloydmasters Project Services Limited | Information & communication | 2012 |
| Lloyds Counselling Services Limited | Health & social care | 2019 |
| Lloyds Plastering Ltd | Construction | 2014 |
| LLP Marketing Ltd | Professional & scientific | 2022 |
| Llps Ltd | Real estate | 2025 |
| LLR Group Limited | Professional & scientific | 2016 |
| LMB Civils Ltd | Construction | 2019 |
| LMK Contractors Limited | Construction | 2022 |
| LMM Construction Ltd | Construction | 2021 |
| LMP Law Limited | Professional & scientific | 2015 |
| LMPSERVICES4U Ltd | Manufacturing | 2015 |
| LNB Vending Ltd | Wholesale & retail | 2026 |
| LNC Plumbing & Heating Ltd | Construction | 2020 |
| LNE Systems Limited | Construction | 1995 |
| Lne-Gmed UK Limited | Professional & scientific | 2021 |
| LNR Automotive Ltd | Wholesale & retail | 2024 |
| LNT Technologies Limited | Information & communication | 2012 |
| Lnt&T Limited | Professional & scientific | 2011 |
| LNW Data Services Ltd | Information & communication | 2022 |
| LO Bianco Limited | Professional & scientific | 2012 |
| LO Property Investments Ltd | Real estate | 2021 |
| Loaded Mobi LLP | | 2012 |
| Loadlock Limited | Administrative & support | 1999 |
| Loadmore Limited | Manufacturing | 2013 |
| Loadpack Limited | Administrative & support | 2022 |
| Lobbo Logistics Limited | Transport & logistics | 2025 |
| Lobster Frock Ltd | Arts & recreation | 2023 |
| Local Labs Ltd | Information & communication | 2026 |
| Local Ledger Accounting Ltd | Professional & scientific | 2025 |
| Locate Medical Limited | Other services | 2024 |
| Locate Sales & Marketing Limited | Administrative & support | 2008 |
| Location LET Limited | Real estate | 2019 |
| Lockfast (Northampton) Limited | Wholesale & retail | 2007 |
| Lockinszn Ltd | Information & communication | 2026 |
| Loco Motive Studios Ltd | Arts & recreation | 2009 |
| Locsbyak Ltd | Other services | 2026 |
| Locum 24 Limited | Professional & scientific | 2014 |
| Locum People Ltd | Administrative & support | 2011 |
| Lodge and West Dene Educational Trust Limited | Education | 1969 |
| Lodge Building Services Ltd | Construction | 2015 |
| Lodge Flooring Ltd | Construction | 2023 |
| Lodi Associates Ltd | Health & social care | 2024 |
| Loft Accessories Ltd | Construction | 2025 |
| Lofts Inc Ltd | Real estate | 2018 |
| Loftus Consulting Limited | Administrative & support | 2012 |
| Loftus Landscapes Limited | Administrative & support | 1999 |
| LOG E Development UK Ltd | Professional & scientific | 2026 |
| Logan Accountants Limited | Professional & scientific | 2011 |
| Logan Bookeepers Ltd | Professional & scientific | 2022 |
| Logan Investors Ltd | Real estate | 2022 |
| Logan's Haulage Limited | Transport & logistics | 2010 |
| Logc Sales Ltd | Arts & recreation | 1913 |
| Logic Experts Limited | Information & communication | 2018 |
| Logical Business and Accountancy Services Ltd | Professional & scientific | 2013 |
| Logicedge Ltd | Information & communication | 2023 |
| Logicllabs Ltd | Education | 2025 |
| Logicshore Capital Ltd | Financial services | 2026 |
| Logiqal Limited | Professional & scientific | 2001 |
| Logispeed Ltd | Transport & logistics | 2019 |
| Logistics Improvement Group Ltd | Professional & scientific | 2016 |
| Logix Delivery Ltd | Transport & logistics | 2026 |
| Lohmann Technologies U.K. Limited | Wholesale & retail | 1992 |
| Lojixx Memory Solutions Ltd | Administrative & support | 2015 |
| Lojixx Systems Ltd | Professional & scientific | 2022 |
| Lojixx Technologies Limited | Professional & scientific | 2007 |
| Lola LYS Ltd | Wholesale & retail | 2025 |
| Lola's Childcare Limited | Health & social care | 2024 |
| Lolaa Limited | Transport & logistics | 2024 |
| Lolakat Ltd | Other services | 2026 |
| Lolite Technologies UK Limited | Information & communication | 2023 |
| Lollipops Day Nursery Limited | Education | 2019 |
| LOM Accountants Limited | Professional & scientific | 2016 |
| Lomax Recruitment Group Limited | Administrative & support | 2020 |
| Lombard Street Restaurants Limited | Extraterritorial | 2006 |
| London & Colonial (Administration Services) Limited | Financial services | 2003 |
| London & Colonial (Trustee Services) UK Limited | Financial services | 2003 |
| London & Paris Energy Limited | Mining & quarrying | 2017 |
| London & Provinces Developments Limited | Extraterritorial | 1981 |
| London Accounts and Business Consultancy Limited | Professional & scientific | 2012 |
| London Advantage Limited | Financial services | 2013 |
| London and Oxford Professional Studies Ltd | Education | 2024 |
| London Corporate Finance Limited | Financial services | 2021 |
| London Design Research and Development Ltd | Professional & scientific | 2022 |
| London Endodontic Specialists Limited | Health & social care | 2020 |
| London General Omnibus Company Limited | Transport & logistics | 2022 |
| London Ice Cream Ltd | Hospitality | 2023 |
| London Labels Shareholder Restoration Limited | Other services | 1993 |
| London Laboratory Ltd | Administrative & support | 2022 |
| London Lines Ltd | Professional & scientific | 2025 |
| London Mayfair Properties Limited | Real estate | 2013 |
| London Medical Care Ltd | Health & social care | 2017 |
| London Online Retail Sales Ltd | Education | 2021 |
| London Passenger Transport Board Limited | Transport & logistics | 2022 |
| London Public Omnibus Company Limited | Transport & logistics | 2022 |
| London Road Group Ltd | Real estate | 2019 |
| London Road Nursery School Ltd | Education | 2003 |
| London School of Leadership Ltd | Information & communication | 2023 |
| London School of Leadership, Investment, and Technology Ltd | Information & communication | 2021 |