| LA Beyona London Ltd | Wholesale & retail | 2026 |
| LA Conja Properties Limited | Real estate | 2002 |
| LA Maison Couture LLP | | 2006 |
| LA Maison Couture Ltd | Extraterritorial | 2006 |
| LA Sala Fresca Ltd | Wholesale & retail | 2021 |
| LA Vida Limited | Wholesale & retail | 1999 |
| Lackhams Estates Limited | Hospitality | 2021 |
| Ladies Hacking Society Ltd | Information & communication | 2019 |
| Lafayette Press Limited | Administrative & support | 2003 |
| Laine Financial Management Ltd | Financial services | 2014 |
| Laing Media Ltd | Information & communication | 2020 |
| Laitwood Consulting Ltd | Professional & scientific | 2022 |
| Lake House Productions Limited | Information & communication | 2018 |
| Lakh Limited | Administrative & support | 2011 |
| Lakthen Ltd | Information & communication | 2019 |
| Lala Yusifova Academy Ltd | Arts & recreation | 2024 |
| Lamazi Fabrics Limited | Wholesale & retail | 2018 |
| Lamont Land Services Limited | Professional & scientific | 2026 |
| Lampards Limited | Real estate | 1999 |
| Lancastersolutions Limited | Real estate | 2025 |
| Land Sea and Air Consultancy Limited | Professional & scientific | 2023 |
| Landgage Heritage Limited | Professional & scientific | 2020 |
| Lane Carpentry & Construction Limited | Construction | 2022 |
| Lane Contracts Ltd | Construction | 2008 |
| Language Teachers Ltd | Education | 2020 |
| Lanique IP Ltd | Financial services | 2026 |
| Lanolips Limited | Wholesale & retail | 2013 |
| Lansdowne Extra Care Ltd | Construction | 2025 |
| Lapar Limited | Real estate | 2012 |
| Laradele Engineering Ltd | Information & communication | 2019 |
| Larden Hall Management Co Ltd | Households | 2019 |
| Larwin Limited | Real estate | 1968 |
| Laser Planet Limited | Arts & recreation | 2014 |
| Laura Southcott Limited | Professional & scientific | 2016 |
| Laven Engineering Limited | Mining & quarrying | 2006 |
| Lavery Rowe Holdings Limited | Professional & scientific | 2014 |
| Lavery Rowe Trustees Limited | Professional & scientific | 2021 |
| Lawlah Group Ltd | Administrative & support | 2020 |
| Lawnscape Designs Limited | Administrative & support | 2016 |
| Laws Property Holdings Ltd | Real estate | 2026 |
| Lawson Hunt Industrial Park (Management) Limited | Administrative & support | 1982 |
| Lawton Business Psychology Ltd | Professional & scientific | 2021 |
| Laymac Ltd | Construction | 2026 |
| LB Property Services (Sussex) Limited | Construction | 2015 |
| LBB Fixing Limited | Construction | 2018 |
| Lbje Trading Ltd | Wholesale & retail | 2024 |
| LBS (Serving Biotechnology) Ltd. | Wholesale & retail | 1939 |
| LBS Biotech (Holdings) Limited | Professional & scientific | 2013 |
| LC39 Ventures Limited | Professional & scientific | 2026 |
| Lclx Aviation Limited | Transport & logistics | 2016 |
| LD Asset Management Limited | Administrative & support | 2024 |
| LD3 Communications Limited | Professional & scientific | 2020 |
| LDV Architecture Limited | Professional & scientific | 2013 |
| Leadbeater Joinery Limited | Construction | 2005 |
| Leadgen AI Ltd | Professional & scientific | 2025 |
| Leadsol Global Ltd | Wholesale & retail | 2025 |
| Leafy Enterprises Ltd | Wholesale & retail | 2015 |
| Learn With Confidence Exams Ltd | Education | 2025 |
| Learn With Confidence Ltd | Education | 2020 |
| Learner Adams Bones Ltd | Professional & scientific | 2009 |
| Learning Development and Research Training Ltd | Professional & scientific | 2015 |
| Learning Potential Tuition LLP | | 2020 |
| Leave to Remain Community Interest Company | Arts & recreation | 2009 |
| LED Roadway Lighting UK Limited | Manufacturing | 2010 |
| Ledmore Sussex Hospitality Limited | Hospitality | 2017 |
| Leede Limited | Households | 2015 |
| Leegra Solutions Limited | Professional & scientific | 2023 |
| Leema Project Controls Ltd | Professional & scientific | 2015 |
| Lees TEC Ltd | Water & waste | 2023 |
| Left Join Labs Ltd | Information & communication | 2025 |
| Leftweb Limited | Information & communication | 2012 |
| Legacy Plasterwork Ltd | Construction | 2026 |
| Legacy PS Limited | Construction | 2021 |
| Legal Alternative Corporate Director Limited | Financial services | 2018 |
| Legal Alternative Limited | Professional & scientific | 2016 |
| Legal Alternative Trustee Limited | Financial services | 2018 |
| Legal Alternative Verify Limited | Administrative & support | 2024 |
| Legal Target Limited | Administrative & support | 2021 |
| Legend Consultants Limited | Professional & scientific | 2016 |
| Leighton & Co Services Limited | Construction | 2022 |
| Leith Hill Plant Limited | Construction | 2001 |
| Lekker Global Limited | Information & communication | 2020 |
| Lemonade Clean Ltd | Administrative & support | 2025 |
| Lemonbiscuit Ltd | Information & communication | 2005 |
| Lemtec Information Systems UK Limited | Information & communication | 2007 |
| Lemurpoint Legacies Limited | Real estate | 2015 |
| Lenago Limited | Professional & scientific | 2012 |
| Lender Tech Ltd | Information & communication | 2023 |
| LEO Products Limited | Wholesale & retail | 2003 |
| LES Searle & Sons Transport Limited | Transport & logistics | 2012 |
| LES Searle Earthmoving Limited | Construction | 1979 |
| LES Searle Group Limited | Financial services | 2017 |
| LESS2BUILDIT UK Ltd | Water & waste | 2015 |
| Let's Nail IT Ltd | Other services | 2019 |
| Lethal Plant Hire Ltd | Manufacturing | 2025 |
| Lets Build IT (Sussex) Limited | Construction | 2011 |
| Lettsaccounting Limited | Professional & scientific | 2024 |
| Let’S Collaborate Limited | Professional & scientific | 2018 |
| Level UP Building Group Limited | Construction | 2025 |
| Levy Services Limited | Construction | 2026 |