| Lee's Maxime Chinese Take-Away Ltd | Hospitality | 2017 |
| Leftstone Purple Ltd | Hospitality | 2024 |
| Lemonade Architects Ltd | Professional & scientific | 2023 |
| Lemuria SP Limited | Real estate | 2023 |
| Lenis Designer Ltd | Information & communication | 2022 |
| LEO Clothes Limited | Wholesale & retail | 2026 |
| LEO Personal Security Limited | Administrative & support | 2026 |
| Leopolis Projects Ltd | Construction | 2017 |
| Lets Go Bikebox Ltd | Administrative & support | 2025 |
| Lewis & Palmer Limited | Wholesale & retail | 2017 |
| Lewis Harris Real Estate Ltd | Real estate | 2025 |
| Lexington Finance Limited | Financial services | 2002 |
| Lexington Group Limited | Other services | 1993 |
| LFK Travel Ltd | Administrative & support | 2026 |
| LGM Management Limited | Construction | 2012 |
| Libra Worldwide Limited | Information & communication | 2009 |
| Life Aims Ltd | Manufacturing | 2020 |
| Life-Hak Coaching Ltd | Education | 2022 |
| Lift AS WE Climb Ltd | Professional & scientific | 2024 |
| Lift Consultant Limited | Professional & scientific | 2016 |
| Light AS Air Ltd | Administrative & support | 2010 |
| Lighthouse Carepoint Ltd | Health & social care | 2020 |
| Lightwatch Ltd | Information & communication | 2021 |
| Lilantir Ltd | Professional & scientific | 2024 |
| Lilu Accessories Ltd | Wholesale & retail | 2025 |
| Lindell Consulting Limited | Other services | 2014 |
| Linear Consulting Engineers Limited | Professional & scientific | 2012 |
| Lingley Bowers Studio Ltd | Construction | 2025 |
| Link for the Future Ltd | Real estate | 2023 |
| Link National Formations Ltd | Construction | 2024 |
| Linkup Solutions Private Limited | Transport & logistics | 2025 |
| Lion Gate Developments Limited | Construction | 1997 |
| Liquidsoft Ltd | Information & communication | 2010 |
| Lita Properties Ltd | Real estate | 2025 |
| Little Crickets Stay and Play Ltd | Hospitality | 2024 |
| Little Mixers Consultancy Limited | Manufacturing | 2017 |
| Little Places Childcare Ltd | Health & social care | 2020 |
| Littledene (Esher) Limited | Households | 2006 |
| Littlemeandmoe Ltd | Wholesale & retail | 2026 |
| Liu's Accounting Ltd | Professional & scientific | 2011 |
| LIZ Taylor Associates Ltd | Professional & scientific | 2020 |
| LLC Projects Ltd | Construction | 2025 |
| LMD Sealants Ltd | Construction | 2017 |
| LMG Consulting Ltd | Education | 2025 |
| LMS Consultants Ltd | Professional & scientific | 2003 |
| Loc@L Cars Limited | Wholesale & retail | 2025 |
| Local Knowledge Golf Experiences Ltd | Administrative & support | 2024 |
| Location NOW Ltd | Information & communication | 2022 |
| Lodestar Cars Ltd | Wholesale & retail | 2026 |
| Loft & Co Property Management Services Ltd | Households | 2025 |
| Logistics Consultation Services Limited | Transport & logistics | 2020 |
| London Boiler Room Limited | Construction | 2023 |
| London Wait & Load Ltd | Construction | 2023 |
| Loom Craft Limited | Wholesale & retail | 2025 |
| Lorienwood Holdings Limited | Construction | 2019 |
| Lost Kiwi Limited | Wholesale & retail | 2017 |
| Louey VEE Ltd | Information & communication | 2025 |
| Love ME DO Brides Limited | Wholesale & retail | 2005 |
| LOW Cost Cleaning Supplies Limited | Wholesale & retail | 2010 |
| Loxstok Ltd | Administrative & support | 2021 |
| LS Properties (Surrey) Limited | Real estate | 2022 |
| LSE Plumbing and Heating Ltd | Construction | 2019 |
| Luce Designs Limited | Manufacturing | 2023 |
| Lucky Bright Ltd | Wholesale & retail | 2026 |
| Lucy's PEN Ltd | Information & communication | 2021 |
| Lumen Insights Limited | Information & communication | 2024 |
| Lumvfx Ltd. | Professional & scientific | 2015 |
| Luna ROX Digital Ltd | Information & communication | 2016 |
| Lunar Bathrooms Ltd | Construction | 2023 |
| Lunaseph Investments Ltd | Real estate | 2024 |
| Lurox Electrical Services Limited | Construction | 2019 |
| Lurox Property Services Ltd | Real estate | 2020 |
| Luxury Bathroom World Limited | Wholesale & retail | 2019 |
| LW Golf Limited | Arts & recreation | 2024 |
| LXK Holdings Ltd | Financial services | 2025 |
| Lådan Limited | Wholesale & retail | 2015 |
| M P Athletics Ltd | Arts & recreation | 2025 |
| M Square II Limited | Real estate | 2020 |
| M Square to Cube Ltd | Professional & scientific | 2021 |
| M. Dowling Services Limited | Professional & scientific | 2003 |
| M.R Plumbing & Heating Solutions Ltd | Construction | 2020 |
| M22 Ltd | Construction | 2026 |
| Maatri Limited | Real estate | 2020 |
| MAC Creative Ltd | Construction | 2008 |
| Made 2 Measure Experiences Ltd | Professional & scientific | 2009 |
| Made by Charles Ltd | Manufacturing | 2025 |
| Madi Security Ltd | Administrative & support | 2021 |
| Madjax Property Ltd | Real estate | 2021 |
| Mafalda Santana Ltd | Administrative & support | 2016 |
| MAG Construction Ltd | Construction | 2012 |
| MAG Extend Limited | Construction | 2020 |
| Magical Crafters Limited | Wholesale & retail | 2020 |
| Mahuika Limited | Energy | 2016 |
| Maiden Moor Property Ltd | Real estate | 2025 |
| Maintenance Services Group Ltd | Construction | 2022 |
| Maitlord Ltd | Real estate | 2024 |
| Making Developments Limited | Construction | 2007 |
| Mako Bioconsultants Ltd | Professional & scientific | 2026 |
| Makswell Ltd | Construction | 2025 |
| Maple Tree Consulting Services Ltd | Professional & scientific | 2023 |