| Lease-A-Leaf Limited | Wholesale & retail | 1992 |
| Leathers and Thread Ltd | Wholesale & retail | 2023 |
| Leave ME Alone, Lisa Ltd | Hospitality | 2022 |
| Leaves Beans & Bubbles Ltd | Wholesale & retail | 2022 |
| Leaworth Limited | Real estate | 2001 |
| Leazes Arcade Limited | Real estate | 1992 |
| Leazes Lane Main House Management Company Limited | Real estate | 2004 |
| Leazes Leasure Ltd | Hospitality | 2026 |
| Leazes Square Limited | Real estate | 1987 |
| Leazes Stores Limited | Wholesale & retail | 2014 |
| Lebarlon Limited | Administrative & support | 2019 |
| Ledge Developments Limited | Real estate | 2003 |
| LEE Developments (North East) Ltd | Construction | 2012 |
| LEE Hall Wealth Management Ltd | Financial services | 2012 |
| LEE Property Development Group Limited | Real estate | 2025 |
| LEE Rich Demolition Ltd | Water & waste | 2021 |
| LEE Smith Communications (UK) Limited | Information & communication | 2005 |
| LEE Wholesale Ltd | Wholesale & retail | 2013 |
| Leela Homes Limited | Real estate | 2021 |
| Leeming Gate Management Company Limited | Households | 2015 |
| Leeming Lane Residents Company Limited | Households | 2001 |
| LEFT2RIGHTCLOTHING Ltd | Manufacturing | 2026 |
| Leftside Films Ltd | Manufacturing | 2021 |
| Legacy Construct Ltd | Construction | 2026 |
| Legacy Entertainment Group Ltd | Arts & recreation | 2015 |
| Legacy Guardians Limited | Professional & scientific | 2024 |
| Legacy Lets Ltd | Real estate | 2024 |
| Legacy Retailers Ltd | Wholesale & retail | 2024 |
| Legacy UK Estates Limited | Real estate | 2024 |
| Legacy Youth Care (LYC) Ltd | Health & social care | 2023 |
| Legacy Youth Care (UK) Ltd | Real estate | 2024 |
| Legacylink Ltd | Information & communication | 2026 |
| Legal Box Ltd | Administrative & support | 2019 |
| Legal Focus Ltd. | Professional & scientific | 2019 |
| Legend Enterprises (North East) Ltd | Wholesale & retail | 2018 |
| Legend Enterprises UK Ltd | Wholesale & retail | 2008 |
| Legend Nails Ltd | Other services | 2018 |
| Legendary Leisure Ltd | Hospitality | 2026 |
| Leicester Educational Investments Limited | Construction | 2019 |
| Leigh Hetherington Limited | Manufacturing | 2008 |
| Leighcam 3 Ltd | Other services | 2021 |
| Leighton Corporation Limited | Information & communication | 1997 |
| Leighton Holdings Limited | Professional & scientific | 2004 |
| Leighton Limited | Information & communication | 1996 |
| Leighton Menswear Limited | Wholesale & retail | 2011 |
| Leila Lily's Limited | Hospitality | 2019 |
| Leila Mehdi Limited | Health & social care | 2024 |
| Leisure Business Services Limited | Hospitality | 2023 |
| Leisure Force Training Ltd | Education | 2018 |
| Leisure Timber Products Limited | Wholesale & retail | 2019 |
| Leisuretime (Leasehold) Limited | Hospitality | 2009 |
| Leisuretime PUB Group Limited | Hospitality | 2009 |
| Leith/Bowden Productions Limited | Other services | 2016 |
| Lemingtonconvenience Ltd | Wholesale & retail | 2020 |
| Lemon Drizzle Recruitment Limited | Administrative & support | 2024 |
| Lemon Grass Deli Limited | Hospitality | 2023 |
| Lemongrass & Ginger Ltd | Other services | 2026 |
| Lemoria Accounting Services Ltd | Information & communication | 2023 |
| Lemoth Limited | Health & social care | 2009 |
| Lemotha Limited | Health & social care | 2023 |
| Lending Solutions Holdings Limited | Financial services | 2004 |
| Lending Solutions Limited | Professional & scientific | 1986 |
| Lenelec Ltd | Construction | 2013 |
| Lennon Property Management Limited | Real estate | 2014 |
| Lennox Joinery and Construction Ltd | Manufacturing | 2019 |
| Lenny. Ltd | Construction | 2023 |
| Lenore Specialist Care Limited | Health & social care | 2012 |
| Lense Construction Services Ltd | Construction | 2024 |
| Leon & Chanelle Limited | Hospitality | 2013 |
| Leon Foods Ltd | Hospitality | 2026 |
| Leon Trader Ltd | Wholesale & retail | 2025 |
| Leonardo 19 Ltd | Hospitality | 2019 |
| Leovegas UK Limited | Professional & scientific | 2017 |
| LES Nouveaux Pauvres Limited | Extraterritorial | 2011 |
| Lescrow Investments Limited | Financial services | 2010 |
| Lesleys Hot Wings Ltd | Hospitality | 2019 |
| Lessons Research Ltd | Professional & scientific | 2024 |
| Let's Circus LLP | | 2008 |
| Let-One Limited | Real estate | 2009 |
| LETMORE4U Ltd | Households | 2025 |
| Letpoint Ltd | Real estate | 2025 |
| Lets Automate Your BIZ Limited | Information & communication | 2023 |
| Lets COHABIT8 Limited | Real estate | 2023 |
| Lets GET Visual Ltd | Wholesale & retail | 2025 |
| Lets Sell Property Ltd | Real estate | 2021 |
| Letvest Ltd | Real estate | 2025 |
| Letz London Limited | Administrative & support | 2019 |
| Leung's Ltd | Health & social care | 2014 |
| Level 2 Beauty & Hairdressing Ltd | Other services | 2019 |
| Level 9 Leadership Ltd | Education | 2025 |
| Level Above Developments Ltd | Construction | 2026 |
| Level Gym Group Ltd | Arts & recreation | 2025 |
| Level UP Community CIC | Information & communication | 2026 |
| LEVEL5 Ventures Limited | Information & communication | 2025 |
| Levels Above Construction Ltd | Construction | 2025 |
| Levels Barber Co Ltd | Other services | 2024 |
| Levers Coaches Limited | Professional & scientific | 1990 |
| LEVES7 | Financial services | 2013 |
| Leveys Holdings Limited | Financial services | 1990 |
| Levonit Ltd | Information & communication | 2018 |