| Laffan and Laffan UK Ltd | Wholesale & retail | 2025 |
| Lafisa UK Limited | Wholesale & retail | 2026 |
| Lagom Group Limited | Information & communication | 2017 |
| Lagoni Enterprises Ltd | Real estate | 2020 |
| Lake Electrical Contractors Ltd | Construction | 2025 |
| Lakeridge Holdings Limited | Real estate | 2025 |
| Lakeridge Solutions Ltd | Construction | 2023 |
| Lakeside Health and Fitness Limited | Arts & recreation | 2015 |
| LAL Private Hire Ltd | Transport & logistics | 2022 |
| Lama's Food Limited | Hospitality | 2025 |
| Lambert & Lambert Limited | Administrative & support | 2018 |
| Lambourne Court Management Company Limited | Households | 2002 |
| Lamed Solutions Ltd | Information & communication | 2018 |
| Lamorva Ltd | Professional & scientific | 2018 |
| Lancer Labels Limited | Manufacturing | 2006 |
| Landmark Landscapes Limited | Administrative & support | 2016 |
| Lane Valley Designs Ltd | Professional & scientific | 2021 |
| Langdales Limited | Manufacturing | 1996 |
| Lantana Publishing Ltd. | Information & communication | 2014 |
| LAP Bros Welding Limited | Manufacturing | 2017 |
| LAP Group Holdings Ltd | Financial services | 2024 |
| Large Motor Company Limited | Wholesale & retail | 2023 |
| Larmer Brown Limited | Information & communication | 2013 |
| Larter-Evans Ltd | Professional & scientific | 2025 |
| LAS Property Investments Limited | Administrative & support | 2017 |
| Lasseter Downie Planning Ltd | Professional & scientific | 2008 |
| Last Crusade Limited | Professional & scientific | 2024 |
| Lattice Communications Ltd | Information & communication | 2010 |
| Laura Cosmetics Limited | Other services | 2016 |
| Laura Fishlock Osteopathy Newbury Ltd | Health & social care | 2025 |
| Lauri Signalling Consultants Limited | Professional & scientific | 2019 |
| Laurier Rose Designs Limited | Wholesale & retail | 2012 |
| Lavisher Building & Roofing Limited | Construction | 2008 |
| Lawson Carpentry & Construction Ltd | Construction | 2022 |
| LB Basingstoke Ltd | Other services | 2024 |
| LB Developments (Newbury) Ltd | Construction | 2024 |
| LB Medical Services Ltd | Health & social care | 2022 |
| LCH Travel & Logistics Consulting Ltd | Transport & logistics | 2026 |
| LCJ Hospitality Limited | Hospitality | 2024 |
| LCW UK Limited | Wholesale & retail | 2014 |
| LD Sensors Ltd | Manufacturing | 2008 |
| LDJ Property Limited | Real estate | 1987 |
| LDS UK Technologies Limited | Wholesale & retail | 2024 |
| LE Marchant Barracks Management Company Limited | Administrative & support | 2007 |
| Lead Films Ltd | Information & communication | 2020 |
| Leading Edge Films Ltd | Information & communication | 2019 |
| Leading in Practice Ltd | Professional & scientific | 2025 |
| Leadwell Group Ltd | Professional & scientific | 2025 |
| Leafline ARB Limited | Administrative & support | 2024 |
| Leanheart Limited | Professional & scientific | 2018 |
| Learning Lanes Therapy Ltd | Health & social care | 2023 |
| Leave Footprints Limited | Administrative & support | 2025 |
| Lebanese House Limited | Hospitality | 2023 |
| Lebanese One Limited | Hospitality | 2008 |
| Leckford Signs (Northampton) Ltd | Professional & scientific | 2007 |
| Leckhampstead Farm Ltd | Agriculture & fishing | 2020 |
| LEE Martin Racing Ltd | Arts & recreation | 2013 |
| Leeward Ltd | Information & communication | 2024 |
| Legacy Multi-Lets Ltd | Real estate | 2020 |
| Leisure DRIVE7.5 Ltd | Education | 2026 |
| Leisure Promotions (Newbury) Limited | Wholesale & retail | 2003 |
| Lenster Investments Limited | Financial services | 1981 |
| Leopard Lodge Limited | Real estate | 2024 |
| Lewis Logistical Solutions Ltd | Water & waste | 2026 |
| Lewis Rawlings Ltd | Water & waste | 2005 |
| LFZ Manufacturing Limited | Extraterritorial | 2016 |
| LG and AB Catering Ltd | Hospitality | 2020 |
| LGI Designs Limited | Professional & scientific | 2015 |
| LGI Properties Ltd | Real estate | 2023 |
| Lgsf Construction Ltd | Construction | 2024 |
| Lh-Events Limited | Professional & scientific | 2004 |
| Libra Management Associates Limited | Professional & scientific | 2011 |
| Lichfields Limited | Administrative & support | 2006 |
| Liddiard Research Limited | Information & communication | 2020 |
| Life Narratives Ltd | Professional & scientific | 2025 |
| Lifecycle Software Limited | Information & communication | 1995 |
| Lifetime Legal Services Limited | Professional & scientific | 2015 |
| Lightcam Limited | Extraterritorial | 2004 |
| Lightli Ltd | Information & communication | 2023 |
| Lightyear Recruitment Limited | Administrative & support | 2024 |
| Lilac Court (Thatcham) Management Limited | Hospitality | 2005 |
| Lily Alberta Limited | Wholesale & retail | 2011 |
| Lime Kiln Cottages Management Limited | Real estate | 2010 |
| Linda Key Connections Limited | Professional & scientific | 2010 |
| Lindacre Homes Limited | Construction | 2003 |
| Linear Guidance Illumination Limited | Manufacturing | 2013 |
| Linemaxi Limited | Real estate | 1987 |
| Lingfield Driving Consultancy Limited | Education | 2022 |
| Link Way Leaseholds Limited | Real estate | 2006 |
| Liquid Engineering (UK) Limited | Wholesale & retail | 1990 |
| Liquorish Enterprises Ltd | Wholesale & retail | 2024 |
| Little Oak Psychology Limited | Health & social care | 2025 |
| Littledata Technologies Ltd | Information & communication | 2014 |
| Littlesmasher Ltd | Extraterritorial | 2006 |
| Live Action FX Limited | Manufacturing | 1999 |
| Livebook Limited | Information & communication | 2012 |
| Livecoach Ltd | Information & communication | 2026 |
| Liveridge Holdings Limited | Financial services | 2023 |
| Livestock Genetics Limited | Professional & scientific | 2003 |
| Living Art Pictures Ltd | Information & communication | 2021 |