| Lebrand Investments Limited | Real estate | 2022 |
| Lech Transport & SON Ltd | Transport & logistics | 2016 |
| LEE & Lyngholm Limited | Real estate | 2022 |
| LEE Dunning Consultancy Services Limited | Professional & scientific | 2025 |
| Leel Estate Ltd | Construction | 2025 |
| Leenstep Limited | Health & social care | 2023 |
| Lees Caring Ltd | Health & social care | 2013 |
| Lees Property Holdings Ltd | Real estate | 2024 |
| Lees-Bassett Homes Limited | Real estate | 2025 |
| Legacies Hub Ltd | Wholesale & retail | 2025 |
| Legacy 23 Lettings and Property Services Ltd | Real estate | 2023 |
| Legacy Props Limited | Real estate | 2021 |
| Legacycurations Ltd | Wholesale & retail | 2026 |
| Legal Consultant Limited | Professional & scientific | 2024 |
| Legal Costmasters Limited | Administrative & support | 2006 |
| Legal Necessity Ltd | Professional & scientific | 2020 |
| Legend Layers Ltd | Wholesale & retail | 2026 |
| Legendary Learning and Development Limited | Professional & scientific | 2023 |
| Legendary Property Services Ltd | Construction | 2020 |
| Legends Gym Ltd | Arts & recreation | 2023 |
| Legless Spirits Ltd | Administrative & support | 2022 |
| Leigh Photography Limited | Professional & scientific | 2024 |
| Leighton Paul Property Limited | Real estate | 2017 |
| Leimark Contractors Ltd | Construction | 2011 |
| Leirna Ltd | Information & communication | 2025 |
| Leisure Liner Ltd | Wholesale & retail | 2025 |
| Lelieveld Limited | Real estate | 2024 |
| Lencare Consultancy Ltd | Other services | 2022 |
| Lenley Housing Group Ltd | Health & social care | 2023 |
| Lenley Vent Ltd | Construction | 2019 |
| Leolill Ltd | Construction | 2020 |
| Leoproxy Limited | Information & communication | 2023 |
| Leore Ltd | Wholesale & retail | 2025 |
| Lepsheir Ltd | Administrative & support | 2024 |
| Lepsons Ltd | Wholesale & retail | 2002 |
| Lepsons Tyre Centre Ltd | Wholesale & retail | 2025 |
| Lepus Ltd | Wholesale & retail | 2026 |
| Ler&Maks Ltd | Transport & logistics | 2018 |
| Lesley Loraine Cameron Limited | Extraterritorial | 2024 |
| Lesley Loraine Cameron-Douglas Limited | Extraterritorial | 2025 |
| Leslie Hardcastle Limited | Real estate | 2019 |
| Leslie Varin Ltd | Real estate | 2022 |
| Lesso AI Ltd | Information & communication | 2025 |
| Lester Ezekiel Anthony Wilson Limited | Extraterritorial | 2023 |
| LET ME Direct Limited | Real estate | 2011 |
| LET Prime Limited | Real estate | 2025 |
| LET Shai Slayy Ltd | Other services | 2025 |
| LET US Play (Wolverhampton) | Arts & recreation | 2004 |
| LET2ME Ltd | Real estate | 2025 |
| Letfinity Limited | Households | 2019 |
| Lethara Group Limited | Manufacturing | 2025 |
| Lets Connect Card Ltd | Wholesale & retail | 2024 |
| Letstalkfriend Limited | Information & communication | 2025 |
| Letts Moove Ltd | Real estate | 2025 |
| Letts Move Homes Ltd | Real estate | 2025 |
| Letwin Concepts UK Limited | Real estate | 2025 |
| Levainish Ltd | Administrative & support | 2020 |
| Level UP Bar Limited | Hospitality | 2025 |
| Level UP IT Solutions Ltd | Information & communication | 2026 |
| Levi Hunt Equestrian Training Limited | Education | 2014 |
| Levibplum Ltd | Construction | 2025 |
| Lewis Electromechanical Ltd | Construction | 2012 |
| Lewis Psychology Community Interest Company | Health & social care | 2009 |
| Lewis Psychology Online Limited | Health & social care | 2018 |
| Lewis Rental Properties Ltd | Real estate | 2024 |
| Lewis Transport Direct Ltd | Transport & logistics | 2009 |
| Leyo Super Clean Limited | Administrative & support | 2023 |
| LF Brewery Ltd | Professional & scientific | 2016 |
| Lfcelectric Limited | Construction | 2024 |
| Lfry Fish and Chips Limited | Hospitality | 2025 |
| LG Maintenance Services Ltd | Construction | 2013 |
| Lgchs Limited | Health & social care | 2018 |
| LGM Auto Ltd | Wholesale & retail | 2021 |
| Lgps Central Limited | Financial services | 2016 |
| Lgps Central LP (Feeder) Limited | Financial services | 2018 |
| LH Car Rentals Ltd | Administrative & support | 2023 |
| Lheachkin Ltd | Administrative & support | 2021 |
| Liah Xpress Couriers Ltd | Transport & logistics | 2026 |
| Liam Barry Consulting Ltd | Professional & scientific | 2025 |
| Liam Price Music Ltd | Arts & recreation | 2024 |
| Liam's Golf Ltd | Wholesale & retail | 2025 |
| Libaas Wolverhampton Ltd | Wholesale & retail | 2022 |
| Libatt Recycling Ltd | Water & waste | 2021 |
| Liberation Props Ltd | Real estate | 2021 |
| Liberty Leads Ltd | Wholesale & retail | 2025 |
| Liberty Place (Retail) Management Company Limited | Real estate | 2004 |
| Libox Ltd | Professional & scientific | 2022 |
| Libran Enterprises (2011) Limited | Professional & scientific | 2011 |
| Lichfield Street Coffee Ltd | Hospitality | 2023 |
| LID IT Limited | Hospitality | 2015 |
| Life in the UK Services Limited | Information & communication | 2019 |
| Life in Your Living Room Ltd | Wholesale & retail | 2026 |
| Life Protect UK Financial Services Ltd | Financial services | 2016 |
| Life Skills Holdings Ltd | Real estate | 2019 |
| Life Skills Letting Limited | Real estate | 2022 |
| Life Skills Supporting Accommodation Ltd | Other services | 2016 |
| Life Spring Global Ltd | Health & social care | 2022 |
| Life Time Entertainment Ltd | Arts & recreation | 2023 |
| Life...Learning Innovation for Elevation C.I.C. | Administrative & support | 2022 |
| Lifeline Engineering Supplies Limited | Manufacturing | 2000 |