| Laijawala Investments PVT Ltd | Real estate | 2023 |
| Lammin Limited | Households | 2024 |
| Lancaster Property Ltd | Real estate | 2019 |
| Lanchester Securities Limited | Real estate | 1994 |
| Land & Partners (South East) Limited | Real estate | 2017 |
| Land & Partners (Southern) Limited | Real estate | 2018 |
| Land & Partners Limited | Real estate | 2008 |
| Land & Planning Collective Ltd | Real estate | 2020 |
| Landacre Lettings Ltd | Real estate | 2022 |
| Landed Estates Limited | Construction | 2019 |
| Landlord Express Limited | Real estate | 2017 |
| Landofzemia Ltd. | Information & communication | 2024 |
| Landsdowne Design and Build Limited | Construction | 2011 |
| Laois Agents Limited | Other services | 2012 |
| Latimer Close Management Company Limited | Professional & scientific | 2002 |
| Latton Alpacas Limited | Agriculture & fishing | 2007 |
| Lavisa Ltd | Hospitality | 2023 |
| Lawrence Management Consulting Ltd | Professional & scientific | 2020 |
| Laylas Tanning Limited | Other services | 2022 |
| LB Solutions Limited | Information & communication | 1999 |
| LB Technical Inspection Limited | Professional & scientific | 2017 |
| LC Property Investors Ltd | Real estate | 2024 |
| LCD Investments Limited | Professional & scientific | 2010 |
| Lead Construct Ltd | Construction | 2016 |
| Leading Notes Music Limited | Education | 2014 |
| LEE Court Management Company Limited | Households | 1981 |
| Leer Constructions Ltd | Information & communication | 2016 |
| Legal Change Management Ltd | Professional & scientific | 2021 |
| Lelanie Ltd | Professional & scientific | 2019 |
| Lemberg Caviar UK Ltd | Wholesale & retail | 2021 |
| Lems Group Ltd | Construction | 2024 |
| LEO Chalfont Ltd | Wholesale & retail | 2023 |
| Leonard's Piece Limited | Real estate | 1998 |
| Leospetspa Ltd | Other services | 2015 |
| Lepton Properties Ltd | Real estate | 2019 |
| Lesley's Childcare Limited | Health & social care | 2011 |
| LEX GP LLP | | 2016 |
| Lexham Drakes Road Limited | Real estate | 2011 |
| Lexham Properties Limited | Real estate | 1993 |
| Lexham Property Developments Limited | Real estate | 2015 |
| Lexham Stone Limited | Real estate | 2013 |
| Leywood Developments Limited | Real estate | 2011 |
| Leywood Estates Limited | Real estate | 1954 |
| Libnaa Limited | Health & social care | 2023 |
| Lighthouse Creative Services Limited | Manufacturing | 2000 |
| Lightpoint Medical Ltd | Manufacturing | 2012 |
| Lightpoint Surgical Ltd | Manufacturing | 2023 |
| Limelight Chauffeur Service (London) Ltd | Transport & logistics | 2024 |
| Limitless Life Ltd. | Education | 2015 |
| Lind Property Limited | Real estate | 2020 |
| Lindfield Limited | Financial services | 2020 |
| Lingalin Limited | Information & communication | 2006 |
| Linnet Recruitment Ltd | Administrative & support | 2017 |
| Linvick Limited | Wholesale & retail | 1982 |
| Lionshire Limited | Real estate | 2024 |
| Lior Store Ltd | Wholesale & retail | 2025 |
| Lisa's Beauty Spot Ltd | Wholesale & retail | 2015 |
| Little Cakes Montessori Ltd | Education | 2010 |
| Little Chalfont Charitable Trust | Arts & recreation | 2011 |
| Little Corner Ltd | Information & communication | 2013 |
| Little Missenden Festival | Arts & recreation | 2011 |
| Little PIG Brother Limited | Agriculture & fishing | 2018 |
| Little Walkers Ltd. | Arts & recreation | 2014 |
| Living Essentials Retails Ltd | Wholesale & retail | 2024 |
| Livvakt Limited | Construction | 2009 |
| Liyongo Group Limited | Hospitality | 2024 |
| LIZ Peters Ltd | Professional & scientific | 2015 |
| Lizbern Limited | Information & communication | 2023 |
| LK Cotton Company Limited | Wholesale & retail | 2019 |
| LK Decorating Ltd | Construction | 2024 |
| LKF Mechanical Fitout Ltd | Construction | 2016 |
| LKS Developments Limited | Education | 2012 |
| LMC Consulting Limited | Professional & scientific | 2023 |
| LN Technology Limited | Professional & scientific | 2023 |
| Logistical Consultants Limited | Transport & logistics | 2017 |
| London & Counties Office Supplies Ltd | Professional & scientific | 2004 |
| London Bollywood Ltd | Arts & recreation | 2015 |
| London Direct Transport Ltd | Transport & logistics | 2016 |
| London Headache Centre Ltd | Extraterritorial | 2010 |
| London Media (UK) Limited | Information & communication | 2014 |
| London Real Estate Advisors LLP | | 2012 |
| London Waterjet Limited | Manufacturing | 2016 |
| Long Drive Limited | Administrative & support | 2014 |
| Look Good and Feel Good Ltd | Other services | 2019 |
| Lorem Limited | Health & social care | 2012 |
| Lotay Wellness Ltd | Education | 2023 |
| Lotus Business Intelligence Solutions Limited | Information & communication | 2013 |
| Lotus Medtec UK Ltd | Wholesale & retail | 2025 |
| Louise Dawes Events Limited | Administrative & support | 2024 |
| Love N Laughter Ltd | Arts & recreation | 2023 |
| Lovegrove Homes Ltd | Real estate | 2025 |
| Lowlog Limited | Extraterritorial | 1988 |
| Lowry Parsons Limited | Information & communication | 2011 |
| Lozzacuts Limited | Other services | 2023 |
| LPJ Contracting Limited | Professional & scientific | 2016 |
| LSR Management Limited | Professional & scientific | 2011 |
| LTS Research Ltd | Information & communication | 2023 |
| Luckings Estate LLP | | 2016 |
| Lucy Johnson Performing Arts Limited | Administrative & support | 2017 |
| Ludus Trustee Limited | Financial services | 2025 |