| Legalpal Group Limited | Information & communication | 2025 |
| Legaltek Ltd | Professional & scientific | 2023 |
| Legatum Enterprises Limited | Professional & scientific | 2018 |
| Legend Aircraft Consulting Limited | Professional & scientific | 2019 |
| Legendary Teambuilding Ltd | Arts & recreation | 2022 |
| Legends of Moon Bull Limited | Information & communication | 2025 |
| Leghari Global Ltd | Wholesale & retail | 2025 |
| Legion Developments Ltd | Construction | 2025 |
| Legoss Watches Ltd | Wholesale & retail | 2025 |
| Lehmann Medical Care Ltd. | Professional & scientific | 2020 |
| Leibel Estates Ltd | Real estate | 2018 |
| Leicester International College Ltd | Education | 2025 |
| Leicestershire Locksmiths Limited | Administrative & support | 2015 |
| Leigh Davies Limited | Health & social care | 2018 |
| Leighton Entertainment Ltd | Arts & recreation | 2010 |
| Leighton Hill Building Services Ltd | Construction | 2020 |
| Leison Care Services Ltd | Health & social care | 2019 |
| Leisports Ltd | Wholesale & retail | 2024 |
| Leisure Cardiff Properties Limited | Professional & scientific | 1977 |
| Leisurecruise Ltd | Administrative & support | 2025 |
| Leisuretime Transport Limited | Transport & logistics | 2012 |
| Leitch Travel Ltd | Administrative & support | 2012 |
| Leitilio Limited | Wholesale & retail | 2025 |
| Leitlavs Ltd | Wholesale & retail | 2020 |
| Leizu Innovations Ltd | Manufacturing | 2025 |
| Leka Services Limited | Transport & logistics | 2013 |
| Leka Systems Holdings Ltd | Financial services | 2024 |
| Leka Systems Limited | Manufacturing | 2015 |
| Lekbuz Ltd | Education | 2025 |
| Lekker Services Ltd | Construction | 2020 |
| Lekoro Ltd | Wholesale & retail | 2025 |
| Leli's Cardiff Takeaway Limited | Hospitality | 2026 |
| LEM Security Limited | Administrative & support | 2019 |
| Lema Developments Limited | Wholesale & retail | 2025 |
| Lemcore Distribution Ltd | Wholesale & retail | 2019 |
| Lemija Property Ltd | Real estate | 2024 |
| Lemon Developments Limited | Construction | 2012 |
| Lemon Digital Ltd. | Information & communication | 2020 |
| Lemonade Analysis Limited | Information & communication | 2022 |
| Lemongel Ltd | Arts & recreation | 2025 |
| Lemonpay Blockchain Co., Ltd | Information & communication | 2020 |
| Lempac Ltd | Wholesale & retail | 2024 |
| Lena Economica Ltd | Information & communication | 2025 |
| Lena Enterprise Limited | Wholesale & retail | 2016 |
| Lendhaus Limited | Information & communication | 2017 |
| Lending Advisor Limited | Financial services | 2019 |
| Lendle Broker Services Ltd | Financial services | 2017 |
| Lenevan Administration Limited | Administrative & support | 2013 |
| Leniad Ltd | Manufacturing | 2022 |
| Lennon Connect Limited | Financial services | 2017 |
| Lenny Cherrett Plastering Limited | Construction | 2019 |
| Lenovo Stockholm Limited | Administrative & support | 2018 |
| Lenox Group Limited | Extraterritorial | 2016 |
| Lenpat Limited | Health & social care | 2016 |
| Lensmentor Limited | Education | 2025 |
| Lentrax Translation Services Ltd | Professional & scientific | 2019 |
| Lenuity Ltd | Information & communication | 2021 |
| LEO & LEO DAS Limited | Wholesale & retail | 2025 |
| LEO Capital Holdings Ltd | Administrative & support | 2017 |
| LEO Capital TFS Ltd | Real estate | 2021 |
| LEO Catering Limited | Hospitality | 2016 |
| LEO Crown Limited | Health & social care | 2024 |
| LEO Italian Express Limited | Extraterritorial | 2015 |
| LEO Jean Ltd | Wholesale & retail | 2023 |
| LEO Medpath Limited | Health & social care | 2019 |
| Leodr Ltd | Wholesale & retail | 2018 |
| Leogreen Energy Ltd | Professional & scientific | 2021 |
| Leolace Limited | Wholesale & retail | 2023 |
| Leom Limited Liability Partnership | | 2012 |
| Leon ARC Ltd | Wholesale & retail | 2019 |
| Leon Catley Rail Ltd | Professional & scientific | 2018 |
| Leonard Charles Limited | Wholesale & retail | 1958 |
| Leonce FBA Ltd | Wholesale & retail | 2025 |
| Leonela Trading PC | | 2017 |
| Leoomoruyipharma Limited | Health & social care | 2024 |
| Leopard Spots Film Ltd | Information & communication | 2026 |
| Leos Car Wash Ltd | Administrative & support | 2022 |
| Leosh Ltd | Wholesale & retail | 2026 |
| Leospv Ltd | Real estate | 2021 |
| Lepanto Properties Ltd | Real estate | 2023 |
| Lepik Developments Ltd | Construction | 2025 |
| Lepton Education Ltd | Education | 2019 |
| Leravio Ltd | Wholesale & retail | 2026 |
| Lerita Ecom Ltd | Wholesale & retail | 2024 |
| Lerona Corporate PC | | 2018 |
| Lerret Limited | Wholesale & retail | 2022 |
| LES Batiments Property Management Limited | Real estate | 2019 |
| LES Croupiers Casino Limited | Arts & recreation | 1978 |
| LES Perrotins Ltd | Professional & scientific | 2023 |
| Lesakaa Recruits Ltd | Administrative & support | 2021 |
| Leseniz Ltd | Wholesale & retail | 2025 |
| Lesley Richards Limited | Administrative & support | 2006 |
| Lesley's Sauce Ltd | Manufacturing | 2017 |
| Leslie Marshall Transport Limited | Transport & logistics | 2018 |
| Lessee UK Ltd | Real estate | 2019 |
| LESSONS4LESS Ltd | Professional & scientific | 2019 |
| Lestiko Recruitment Ltd | Public administration | 2020 |
| Lestine Manduakila Ltd | Arts & recreation | 2025 |
| LET 'N' Manage Limited | Real estate | 2016 |
| LET 2 Buy Holdings Ltd | Real estate | 2024 |