| Leopardi Holding Midco Limited | Financial services | 2019 |
| Lerwick Specsavers Limited | Wholesale & retail | 2012 |
| Lescun Consulting Limited | Information & communication | 2004 |
| Lesley George Ltd. | Education | 2000 |
| Lesurf Limited | Financial services | 2014 |
| LET by US Limited | Real estate | 2013 |
| Let's Relax Ltd | Other services | 2017 |
| Letchworth Specsavers Hearcare Limited | Wholesale & retail | 2006 |
| Letchworth Specsavers Limited | Wholesale & retail | 2004 |
| Letchworth Visionplus Limited | Wholesale & retail | 2004 |
| Letwell Lettings Ltd | Real estate | 2025 |
| LEV Master Holdco Limited | Financial services | 2025 |
| Levabond Limited | Other services | 1983 |
| Leven Specsavers Limited | Wholesale & retail | 2009 |
| Lewes Specsavers Limited | Wholesale & retail | 2002 |
| Lewis (Cleaning) Services Limited | Administrative & support | 1985 |
| Lewis Kemmenoe Ltd | Manufacturing | 2026 |
| Lewis Steppens Roofing Ltd | Construction | 2019 |
| Lewisham Specsavers Limited | Wholesale & retail | 1993 |
| Lewisham Visionplus Limited | Wholesale & retail | 1993 |
| Lewtham Engineering Ltd | Construction | 2012 |
| Lexanor Ltd | Information & communication | 2026 |
| Leyland Specsavers Limited | Wholesale & retail | 2017 |
| Leylandii and Lawns Limited | Administrative & support | 2016 |
| LG Transformations Ltd | Manufacturing | 2022 |
| LHP Parks Limited | Hospitality | 2021 |
| Li&Siu Limited | Real estate | 2023 |
| Libby Deller Hairdressing Limited | Other services | 2024 |
| Libero Consulting Limited | Administrative & support | 2003 |
| Liberty Environmental Limited | Administrative & support | 2025 |
| Liberty Salons Limited | Other services | 2024 |
| LIBERTY312 Limited | Professional & scientific | 2015 |
| Licenceme Group Ltd | Other services | 2023 |
| Licencepilot Ltd | Information & communication | 2026 |
| License Plate Workshop Ltd | Manufacturing | 2021 |
| Lichfield Specsavers Hearcare Limited | Wholesale & retail | 2026 |
| Life Made Easy Ltd | Administrative & support | 2023 |
| Life Should BE Beautiful Limited | Health & social care | 2008 |
| Lifeforms X Limited | Wholesale & retail | 2022 |
| Lifelong Care Solutions Ltd | Health & social care | 2025 |
| Lifestack Consulting Limited | Information & communication | 2026 |
| Liftsmiths Ltd | Construction | 2023 |
| Light UP South Ltd | Wholesale & retail | 2022 |
| Light-Dome Road Marker Inserts Limited | Manufacturing | 1994 |
| Lightbox Digital Studios Ltd | Professional & scientific | 2025 |
| Lightfoot Defence (Holdings) Newco Limited | Financial services | 2020 |
| Lightfoot Defence Limited | Administrative & support | 2004 |
| Lighthouse CX Limited | Professional & scientific | 2026 |
| Lighthouse Training Limited | Information & communication | 2025 |
| Lightline Crafts Limited | Manufacturing | 2023 |
| Lightship Consulting Limited | Professional & scientific | 2018 |
| Lightstone Homes Limited | Real estate | 2025 |
| Lilford Investments Ltd | Real estate | 2017 |
| Lilley Marine LLP | | 2014 |
| Lillico Limited | Agriculture & fishing | 2018 |
| Limburn & Field Ltd | Construction | 2018 |
| Linas Car Wash Ltd | Administrative & support | 2022 |
| Lincoln Morrisons Specsavers Hearcare Limited | Wholesale & retail | 2007 |
| Lincoln Morrisons Visionplus Limited | Wholesale & retail | 2001 |
| Lincoln Specsavers Limited | Wholesale & retail | 1996 |
| Lincoln Visionplus Limited | Wholesale & retail | 1996 |
| Lincolnshire 2 Domiciliary Specsavers Limited | Wholesale & retail | 2016 |
| Lincolnshire Newmedica Limited | Health & social care | 2017 |
| Lindsey Cronin Consulting Ltd | Administrative & support | 2025 |
| Line Recruitment Limited | Administrative & support | 2013 |
| Linen Bay Ltd | Wholesale & retail | 2025 |
| Linet UK Limited | Health & social care | 2007 |
| Lineylee Computer Systems (LCS) Limited | Other services | 2015 |
| Linguatute Ltd | Education | 2022 |
| Linlithgow Specsavers Limited | Wholesale & retail | 2018 |
| Linwood Park Management Company Limited | Households | 2025 |
| Lion House Management (Wickham) Limited | Households | 2004 |
| Liquidcode Ltd | Information & communication | 2026 |
| Liss Forest Nursery Limited | Wholesale & retail | 1984 |
| Liteup Events Limited | Other services | 2006 |
| Lithosight Ltd | Mining & quarrying | 2024 |
| Little Bears Forest Preschool Southsea Ltd | Education | 2020 |
| Little Duck Bear Limited | Wholesale & retail | 2014 |
| Little Duck Holdings Ltd | Real estate | 2020 |
| Little Duck Property Services Limited | Construction | 2015 |
| Little E Enterprises Ltd | Other services | 2010 |
| Little Gems Pre-School (Hampshire) Ltd | Health & social care | 2025 |
| Little Melita Ltd | Real estate | 2023 |
| Little Miracles Limited | Other services | 1990 |
| Little Naughtea Limited | Hospitality | 2022 |
| Little Swim Academy Limited | Arts & recreation | 2008 |
| Little-Hartsleap Ltd | Real estate | 2024 |
| Live Art Local CIC | Arts & recreation | 2015 |
| Live Better With Ltd. | Wholesale & retail | 2015 |
| Live Pulse Productions Ltd | Arts & recreation | 2025 |
| Live to Dance Limited | Wholesale & retail | 2015 |
| Liverpool Rice Lane Specsavers Limited | Wholesale & retail | 2018 |
| Liverpool Specsavers Hearcare Limited | Wholesale & retail | 2006 |
| Livesey Advisory Limited | Professional & scientific | 2022 |
| Livewire Theatre Consultants Limited | Arts & recreation | 2010 |
| Living Comforts BCP Limited | Health & social care | 2024 |
| Living Comforts Bournemouth & Christchurch Limited | Health & social care | 2024 |
| Living Comforts Ltd | Health & social care | 2009 |
| Living Comforts Poole Limited | Health & social care | 2024 |
| Livingston Specsavers Hearcare Limited | Wholesale & retail | 2016 |