| Lean Wellbeing Consultancy Ltd | Professional & scientific | 2024 |
| Leander Management Ltd | Professional & scientific | 2013 |
| Lear Construction Group Limited | Financial services | 2019 |
| Lear Limited | Professional & scientific | 1998 |
| Learning and Support Services Limited | Health & social care | 2017 |
| Lease Link Homes Limited | Real estate | 2025 |
| Leavenheath Consultants Limited | Professional & scientific | 2006 |
| Lebudosh Ltd | Information & communication | 2023 |
| LEE Choat Limited | Education | 2013 |
| LEE Rowling Consulting Ltd | Information & communication | 2015 |
| LEE Valley Farm Park Limited | Arts & recreation | 2019 |
| Leech Electrical Ltd | Construction | 2017 |
| Leech Maintenance Services Ltd | Construction | 2024 |
| Leela Boutique Limited | Wholesale & retail | 2022 |
| Legacy Motors Ltd | Wholesale & retail | 2025 |
| Legacy Races Events Limited | Arts & recreation | 2025 |
| Legacyjoy Limited | Real estate | 2024 |
| Legal Business Property Lawyers Ltd | Administrative & support | 2010 |
| Legal Highdration Ltd | Manufacturing | 2025 |
| Legion Healthcare Ltd | Administrative & support | 2022 |
| Leigh Chauffeur Services Ltd | Transport & logistics | 2026 |
| Leisure and Technical Services Limited | Real estate | 1973 |
| Leisure Time Hire Limited | Information & communication | 2012 |
| LEJ Consulting Solutions Ltd | Information & communication | 2025 |
| Lellie’S Jellies Ltd | Wholesale & retail | 2024 |
| Lennard House (Management) Company 2007 Limited | Households | 2007 |
| Lennards Estate Agents Ltd | Real estate | 2024 |
| LEO Partners Limited | Administrative & support | 2020 |
| LEO Recruits Ltd | Administrative & support | 2023 |
| Leon T Investments Limited | Real estate | 2017 |
| Leonard Magee Ltd | Wholesale & retail | 2015 |
| Lepiana Ltd | Hospitality | 2026 |
| LES Hack Properties Ltd | Real estate | 2023 |
| Lesedi Ultrasound Services Limited | Health & social care | 2009 |
| Lesley Lightfoot Limited | Wholesale & retail | 2013 |
| Lestarory Property Investment Limited | Real estate | 2025 |
| LET Software Ltd | Information & communication | 2023 |
| Let's BE Positive Limited | Wholesale & retail | 2019 |
| Lets DO Lunch Limited | Hospitality | 2016 |
| Lets Talk Trade Investment Ltd | Manufacturing | 2022 |
| Lets Talk Trade Ltd | Professional & scientific | 2016 |
| Lets Talk Wheels Ltd | Wholesale & retail | 2025 |
| Level Two Management Limited | Administrative & support | 2003 |
| Level UP Facades Ltd | Construction | 2024 |
| Level UP Football Development Ltd | Education | 2026 |
| Levett Consulting Ltd | Professional & scientific | 2023 |
| Levyloom Limited | Information & communication | 2026 |
| Lewin Properties Ltd | Real estate | 2019 |
| Lewinsky Transport Ltd | Transport & logistics | 2018 |
| Lewis Conquer Consultancy Services Limited | Professional & scientific | 2007 |
| Lewis Digger Hire Limited | Construction | 2018 |
| Lewis Management Limited | Professional & scientific | 2010 |
| Lewis Siddle Properties Limited | Real estate | 2007 |
| Lewis Trading Ltd | Wholesale & retail | 2018 |
| LEX Talent Ltd | Administrative & support | 2025 |
| Lexon Building Services Ltd | Construction | 2022 |
| LF Capital Management Ltd | Financial services | 2021 |
| LF Property Management Limited | Real estate | 2011 |
| LGB Utilities Ltd | Water & waste | 2012 |
| LGC Site Management Limited | Professional & scientific | 2022 |
| LH Notaries Limited | Professional & scientific | 2016 |
| LH S Hair Ltd | Other services | 2019 |
| Liberty Flowers Ilford Shop Limited | Wholesale & retail | 2026 |
| Liberty Flowers Limited | Wholesale & retail | 2009 |
| Liberty Flowers Wholesale Limited | Wholesale & retail | 2012 |
| Liberty Flowers Woodbridge Ltd | Wholesale & retail | 2024 |
| Liberty Lande Private Limited | Wholesale & retail | 2021 |
| Liberty Wholesale International Trading Limited | Wholesale & retail | 2026 |
| Libra Connect Limited | Administrative & support | 2010 |
| Libra Signs Limited | Manufacturing | 2002 |
| Libraesva Limited | Information & communication | 2017 |
| Libratiga Ltd | Professional & scientific | 2023 |
| Lideranca Limited | Professional & scientific | 2023 |
| Liepins Limited | Wholesale & retail | 2017 |
| Life Hope | Health & social care | 2025 |
| Life IS Golf Ltd | Manufacturing | 2025 |
| Life Management Training & Development Limited | Professional & scientific | 2003 |
| Life Science Investments Limited | Professional & scientific | 1999 |
| Lifebloom Care Ltd | Health & social care | 2023 |
| Lifespring Consulting Ltd | Public administration | 2026 |
| Lifestyle Shutters & Blinds Ltd | Construction | 2011 |
| Lifetime Property Management Ltd | Real estate | 2023 |
| Lifewitquenp Ltd | Other services | 2024 |
| Lifstans Ltd | Professional & scientific | 2002 |
| Lift Skin Clinic Limited | Other services | 2025 |
| Lift the Part Ltd | Construction | 2024 |
| Light Gray Racing Ltd | Administrative & support | 2025 |
| Light Green Power Limited | Professional & scientific | 2012 |
| Light Initiative Holdings Limited | Administrative & support | 2019 |
| Light Initiative Limited | Administrative & support | 2011 |
| Light UP Research Ltd | Information & communication | 2020 |
| Lightblue Logic Limited | Information & communication | 2024 |
| Lightbox Studio Bridal Ltd | Other services | 2020 |
| Lightbulb Lending Ltd | Financial services | 2024 |
| Lightening Properties (Holdings) Limited | Financial services | 2019 |
| Lightforce One Limited | Information & communication | 2019 |
| Lightsource Holdco Limited | Other services | 2024 |
| Likemind Recruitment Limited | Administrative & support | 2018 |
| Likes Transport Ltd | Transport & logistics | 2019 |
| Lilly 94 Ltd | Hospitality | 2026 |