| Leade Shipping Limited | Other services | 2010 |
| Leading Protection Group Ltd | Administrative & support | 2022 |
| Leading Security Group Limited | Administrative & support | 2024 |
| Leadrefire.Ai Ltd | Professional & scientific | 2025 |
| Leadway Consults Ltd | Professional & scientific | 2020 |
| Lean on Vision Ltd | Information & communication | 2024 |
| Leap-Tel Limited | Information & communication | 2018 |
| Learning Resource Network Ltd | Education | 2011 |
| Leather O Clock Ltd | Wholesale & retail | 2021 |
| Leboenp MAT Consulting Ltd | Health & social care | 2021 |
| Lech Properties Ltd | Real estate | 2025 |
| Lechelt Practicals Limited | Health & social care | 2022 |
| Lecsim Ltd | Education | 2025 |
| Lecw Limited | Real estate | 2024 |
| Ledo Limited | Professional & scientific | 2016 |
| Ledo Properties Limited | Real estate | 2017 |
| LEE Care Services Limited | Health & social care | 2018 |
| LEE Jones Official Dog Training Ltd | Education | 2024 |
| LEE Kyson Building Consultancy Limited | Construction | 2008 |
| LEE Shopfitters (London) Limited | Wholesale & retail | 1962 |
| Leehoo Service Limited | Wholesale & retail | 2025 |
| Leelux Properties Ltd | Real estate | 2024 |
| Leemah Ltd | Professional & scientific | 2015 |
| Leen Estates Limited | Real estate | 2017 |
| Leeraj Newsagents Limited | Real estate | 2003 |
| Legacy Dynamics Ltd | Wholesale & retail | 2024 |
| Legacy Euro Services Ltd | Information & communication | 2025 |
| Legacy Group Consultancy Ltd | Professional & scientific | 2024 |
| Legacy Haven Support Ltd | Health & social care | 2026 |
| Legacy Holdings International Limited | Real estate | 2024 |
| Legacy Links Property Investments Ltd | Administrative & support | 2016 |
| Legacy Sports International Ltd | Administrative & support | 2018 |
| Legacy Trade Motors Limited | Wholesale & retail | 2026 |
| Legal Mediation Limited | Administrative & support | 2016 |
| Legal Tax Solutions Ltd | Professional & scientific | 2025 |
| Legatum Property Holdings Ltd | Financial services | 2024 |
| Legendlegal Limited | Professional & scientific | 2025 |
| Legends Grooming Ltd | Other services | 2019 |
| Legion Consult Ltd | Wholesale & retail | 2021 |
| Legion Security Ltd | Administrative & support | 2023 |
| Legion Sky Limited | Construction | 2024 |
| Legit Homes Limited | Real estate | 2023 |
| Legon Workforce Solutions Ltd | Administrative & support | 2025 |
| Leicestershire Recovery Limited | Transport & logistics | 2025 |
| Leigh Real Estate Limited | Real estate | 2024 |
| Leigh-Anders Limited | Administrative & support | 2012 |
| Lekaj Camera Action Ltd | Professional & scientific | 2022 |
| Leket Ventures Limited | Health & social care | 2012 |
| Lekki Limited | Health & social care | 2016 |
| Lemborn Joinery Ltd | Construction | 2013 |
| Lemme Tell YOU Ltd | Professional & scientific | 2024 |
| Lemon Exterior Cleaning Ltd | Administrative & support | 2026 |
| Lemon Pictures Limited | Information & communication | 2024 |
| Lenand Healthcare Limited | Financial services | 2024 |
| Lending Choice Limited | Financial services | 2022 |
| Lenity Care Ltd | Administrative & support | 2024 |
| Lenriq - Vincent Limited | Health & social care | 2013 |
| Lens Craft Media Limited | Wholesale & retail | 2024 |
| LEO 22 Holdings Ltd | Real estate | 2020 |
| LEO Builders Ltd | Construction | 2021 |
| LEO Fire Protection Ltd | Construction | 2022 |
| LEO MIX Ltd | Transport & logistics | 2019 |
| LEO PMC Limited | Construction | 2025 |
| LEO Propco Ltd | Real estate | 2024 |
| Leo's Global Limited | Wholesale & retail | 2019 |
| Leoai Labs Ltd | Information & communication | 2026 |
| Leod Builders Limited | Construction | 2024 |
| Leon & Sofia Ltd | Real estate | 2025 |
| Leon FIX Ltd | Construction | 2023 |
| Leon's Arena Bar Ltd | Wholesale & retail | 2025 |
| Leonas Landscaping Limited | Construction | 2025 |
| Leonas Limited | Professional & scientific | 2020 |
| Leonsparks Ltd | Construction | 2025 |
| Leonzio Limited | Wholesale & retail | 2012 |
| Leora Developments Ltd | Construction | 2025 |
| LEOSUNTAX3 Ltd | Professional & scientific | 2024 |
| LES Orchidees (U.K) Ltd | Real estate | 2022 |
| LES Riches Ltd | Wholesale & retail | 2023 |
| LES Sealey Ltd | Other services | 2010 |
| Lessonate Limited | Information & communication | 2015 |
| LET US Share the Care Residential Homes Ltd | Public administration | 2022 |
| Lets Go Saas Ltd | Information & communication | 2023 |
| Letussharethecare Ltd | Health & social care | 2022 |
| Levant Interiors Limited | Construction | 2016 |
| Level UP Dentistry Education Limited | Education | 2024 |
| Levels Marquees & Events Hire Ltd | Administrative & support | 2022 |
| Levett Business Services Ltd | Professional & scientific | 2019 |
| Levett Property Investments Ltd | Real estate | 2019 |
| Levett Property Services Ltd | Real estate | 2019 |
| Levi-Adonia Ltd | Health & social care | 2021 |
| Levick Stanley Ltd. | Administrative & support | 2017 |
| Levinta Limited | Construction | 2016 |
| Levnext Ltd | Information & communication | 2025 |
| Levy Special Projects Limited | Real estate | 2015 |
| Lewis Curtis Limited | Professional & scientific | 2011 |
| Lewt Ltd | Wholesale & retail | 2021 |
| Lexbridge Partners Limited | Professional & scientific | 2020 |
| Lexfiscus Associates LLP | | 2024 |
| Lexi AI Ltd | Information & communication | 2024 |
| Lexi Medical Limited | Health & social care | 2014 |