| LD Property Investment Group Ltd | Real estate | 2021 |
| LD Property Investment UK Ltd | Real estate | 2019 |
| Ldad Ltd | Wholesale & retail | 2025 |
| LDN Championships Limited | Education | 2023 |
| LDP Contracting Ltd | Manufacturing | 2026 |
| LDR Surgical Limited | Health & social care | 2023 |
| Ldsh Strategy Limited | Professional & scientific | 2024 |
| LE Family Property Limited | Real estate | 2025 |
| LE Patissier Limited | Hospitality | 2014 |
| LE Verre Gourmand UK Limited | Other services | 2015 |
| Leaborough Limited | Professional & scientific | 2005 |
| Lead Hub Ltd | Professional & scientific | 2023 |
| Leaden Hill Developments Ltd | Real estate | 2026 |
| Leaders in Flow Ltd | Professional & scientific | 2017 |
| Leadout Innovation Limited | Professional & scientific | 2026 |
| Leafycoll Ltd | Professional & scientific | 2023 |
| Leapership Consultants Ltd | Hospitality | 2019 |
| Leaps and Bounds School for Hounds Ltd | Administrative & support | 2004 |
| Leaps and Bounds Shop for Hounds Limited | Wholesale & retail | 2023 |
| Lear Maintenance Ltd | Real estate | 2021 |
| Lear Properties Limited | Real estate | 2019 |
| Learn Boost Ltd | Education | 2024 |
| Learn English Cambridge Ltd | Education | 2021 |
| Learning Bubble Tuition Limited | Education | 2026 |
| Learning Unfurled Limited | Education | 2021 |
| Learninggate Ltd | Wholesale & retail | 2025 |
| Learnotter Limited | Extraterritorial | 2020 |
| Learnsy Academy Ltd | Education | 2025 |
| Leas World Group Ltd | Financial services | 2025 |
| Leatherhead Research Limited | Professional & scientific | 2015 |
| Leaton Gray Limited | Professional & scientific | 2015 |
| Leavis House Limited | Real estate | 2019 |
| Lecodeh UK Ltd | Wholesale & retail | 2023 |
| Ledbury Court Limited | Households | 2010 |
| LEE and Emma Limited | Professional & scientific | 2015 |
| LEE Andersen Ltd | Professional & scientific | 2026 |
| LEE Beamiss Carpentry & Building Ltd | Construction | 2018 |
| LEE CAM Property Ltd | Real estate | 2019 |
| LEE Construction Cambridge Ltd | Construction | 2021 |
| LEE Engineering & Construction Company Limited | Wholesale & retail | 2023 |
| LEE Katana Limited | Other services | 2011 |
| LEE Laughlin PGA Limited | Education | 2026 |
| Leeds Power Limited | Manufacturing | 2021 |
| Leen Holdings Limited | Construction | 1995 |
| Leeuw Teak Assembly Ltd | Manufacturing | 2024 |
| Leeway Building Services Limited | Construction | 2007 |
| Legacy Energy Group Co., Ltd | Manufacturing | 2025 |
| Legacy Matters Ltd | Professional & scientific | 2020 |
| Legacy Press Ltd | Information & communication | 2025 |
| Legacy-Liftconsulting Ltd | Professional & scientific | 2025 |
| Legal AID Practitioners Group | Other services | 1984 |
| Legal Operations International Limited | Professional & scientific | 2021 |
| Legaltank Ltd | Wholesale & retail | 2021 |
| Legend Family Technology Ltd | Wholesale & retail | 2025 |
| Leggate Consulting Limited | Professional & scientific | 2023 |
| Legge Services Limited | Administrative & support | 2019 |
| Legwork Ltd | Manufacturing | 2020 |
| Leif Partners Ltd | Information & communication | 2025 |
| Leigent Limited | Wholesale & retail | 2023 |
| Leiston Land Limited | Real estate | 2015 |
| Leko Labs UK Limited | Manufacturing | 2022 |
| Leland Management Company Limited | Households | 2021 |
| Leman Engineering Ltd | Professional & scientific | 2019 |
| Lemaolma Ltd | Manufacturing | 2023 |
| Lemin & Co (Product Finishers) Limited | Other services | 1977 |
| Lemma Celebrations Ltd | Wholesale & retail | 2023 |
| Lemonthyme Ltd | Hospitality | 2008 |
| Lemontree Trding Limited | Wholesale & retail | 2025 |
| Lenk Construction Limited | Construction | 2025 |
| Lenprop Ltd | Real estate | 2009 |
| Lens Scientific Co., Ltd | Extraterritorial | 2024 |
| Lenscamo Ltd | Manufacturing | 2021 |
| LEO Air Ltd | Manufacturing | 2025 |
| Leocean Trading Co., Ltd. | Wholesale & retail | 2025 |
| Leon Dean Ltd | Information & communication | 2011 |
| Leona Trading Limited | Wholesale & retail | 2023 |
| Leopard Media Limited | Professional & scientific | 2020 |
| Leos Boutique Limited | Wholesale & retail | 2012 |
| Lergrove Limited | Households | 1983 |
| Leroi & Sons Ltd | Administrative & support | 2022 |
| Leromec Limited | Wholesale & retail | 2025 |
| LES Blackman (VAM) Limited | Financial services | 2011 |
| LES Demoiselles Limited | Professional & scientific | 2022 |
| LES Hills Limited | Other services | 2014 |
| LES Raconteurs Limited | Arts & recreation | 2025 |
| LES Ward Limited | Wholesale & retail | 2017 |
| Lesmiserables Ltd | Manufacturing | 2025 |
| Lestosoftware Ltd | Information & communication | 2024 |
| Lesuarance Company Ltd | Wholesale & retail | 2020 |
| LET by ME Limited | Hospitality | 2024 |
| LET With US Ltd | Real estate | 2015 |
| Let's Go Cambridge Ltd | Administrative & support | 2012 |
| Let's Rent Cambridge Limited | Real estate | 2018 |
| Let's Run Girls Ltd | Arts & recreation | 2022 |
| Lethbridge Estates Limited | Administrative & support | 2006 |
| Letian Saga Group Limited | Wholesale & retail | 2025 |
| Lets Go Investment Ltd | Real estate | 2022 |
| Lets Go Punting Limited | Extraterritorial | 2014 |
| Lets Go Solar Ltd | Energy | 2022 |
| Letscooee Limited | Information & communication | 2020 |