| Lion Parking Manchester Airport Ltd | Transport & logistics | 2025 |
| Lions World Property Ltd | Real estate | 2023 |
| Liquor & Loaded Ltd | Other services | 2018 |
| Liscio Limited | Health & social care | 2009 |
| Lite Delights (Wilmslow) Ltd | Hospitality | 2014 |
| Little Bird's Nest Limited | Health & social care | 2021 |
| Little Splashers Baby Spa Ltd | Other services | 2024 |
| Littleborough Care Home Ltd | Health & social care | 2007 |
| Littlebrick Homes Limited | Construction | 2012 |
| Live Life Surgery Limited | Health & social care | 2022 |
| Liverpool Lets Ltd | Real estate | 2018 |
| Liverpool Vascular Services Limited | Health & social care | 2018 |
| Living Digitally LLP | | 2014 |
| Livingoptions Ltd | Real estate | 2026 |
| LJB Northwest Ltd | Real estate | 2019 |
| LJH Engineering Ltd | Professional & scientific | 2023 |
| LJS Health Ltd | Health & social care | 2019 |
| LJS Sculptures Ltd | Arts & recreation | 2021 |
| LK Brickwork Limited | Construction | 2020 |
| LL Investment Management Ltd | Administrative & support | 2010 |
| LLL11 Ltd | Professional & scientific | 2025 |
| Lloyds Biostatistics Limited | Professional & scientific | 2020 |
| LM Infrastructure Ltd | Arts & recreation | 2017 |
| LM Management Group Ltd | Professional & scientific | 2022 |
| LMA Medical Limited | Health & social care | 2016 |
| LMB Creative Management Ltd | Professional & scientific | 2024 |
| LMM Property Ltd | Real estate | 2025 |
| Lmmg Projects Ltd | Construction | 2023 |
| LOCKUP24 Brandco Limited | Real estate | 2025 |
| Lockwood Wilmslow Limited | Households | 2003 |
| Locum MD Services Limited | Health & social care | 2014 |
| Lodge Medico Legal Ltd | Health & social care | 2023 |
| Lodges Sprinklers Limited | Other services | 2024 |
| Lodwick Medical Limited | Health & social care | 2022 |
| Logiquark Ltd | Information & communication | 2025 |
| Logros Advisory Partners Limited | Professional & scientific | 2023 |
| Loler UK Limited | Construction | 2018 |
| Lomarton Ltd | Professional & scientific | 2015 |
| Lomature Trustees Limited | Professional & scientific | 2026 |
| Lomond (BG Street) Limited | Extraterritorial | 2017 |
| Lomond (BG Street) Nominees Limited | Extraterritorial | 2017 |
| London & Hertfordshire Respiratory Diagnostics Limited | Health & social care | 2018 |
| London and Herts Storage Limited | Transport & logistics | 2024 |
| London Court (Oxford) RTM Company Limited | Households | 2020 |
| London Dermatologist Ltd | Health & social care | 2011 |
| London Neuroscience Ltd | Health & social care | 2020 |
| London Oral & Maxillofacial Services Ltd | Health & social care | 2013 |
| London Plastic and Reconstructive Surgery Ltd | Health & social care | 2013 |
| London Respiratory Medicine Ltd | Health & social care | 2019 |
| London Road Securities Ltd | Construction | 2023 |
| London Road Stapeley Limited | Construction | 2026 |
| London South Central Gastroenterology Ltd | Health & social care | 2024 |
| London Uroradiology LLP | | 2015 |
| Longley Planning FTP Ltd | Professional & scientific | 2021 |
| Looseheadz Limited | Information & communication | 2017 |
| Lorigan Oncology Limited | Health & social care | 2020 |
| Lost Frame Ltd | Wholesale & retail | 2025 |
| Lost in Cheshire Ltd | Professional & scientific | 2019 |
| Louise Olson Limited | Health & social care | 2022 |
| Loulou Properties Ltd | Real estate | 2019 |
| Love Exclusive Photography Ltd | Professional & scientific | 2016 |
| Love Exclusive Properties Ltd | Real estate | 2024 |
| LP CAD Services Limited | Information & communication | 2015 |
| LRC Ltd | Financial services | 2026 |
| Luck Medicolegal Ltd | Health & social care | 2026 |
| Lucollie Investments Limited | Real estate | 2019 |
| Lucy Barker Limited | Health & social care | 2020 |
| Lucy Patel Nutrition Ltd | Health & social care | 2020 |
| Ludarc Limited | Information & communication | 2025 |
| Ludo Ventures Limited | Professional & scientific | 2016 |
| Luke Wilkinson Fitness Limited | Health & social care | 2024 |
| Lulubelle Jewellery Ltd | Wholesale & retail | 2025 |
| Lumac Properties Ltd | Construction | 2021 |
| Lumberjoe Tree Services Limited | Agriculture & fishing | 2025 |
| Lumbridge Limited | Real estate | 2025 |
| Lumen Advisory Consulting Limited | Information & communication | 2025 |
| Luminous Consult Ltd | Other services | 2026 |
| Luminous Media Ltd | Information & communication | 2026 |
| Lumo Productions Limited | Information & communication | 2024 |
| Lund Rentals Ltd | Real estate | 2023 |
| Lung Health Solutions Limited | Health & social care | 2015 |
| Lunis Consultancy LLP | | 2017 |
| LUX Barbers Ltd | Other services | 2013 |
| Luxe Life Furniture Ltd | Wholesale & retail | 2021 |
| Luxe Macarons Ltd | Other services | 2017 |
| Luxon Projects Limited | Professional & scientific | 2009 |
| Luxuriety Limited | Real estate | 2019 |
| Luxury Rugs Limited | Wholesale & retail | 2016 |
| LW Corporation Limited | Financial services | 2024 |
| Lyfe Focus Ltd | Wholesale & retail | 2019 |
| Lyme Design & Build Developments Limited | Real estate | 2016 |
| Lyme Design and Build Limited | Construction | 2008 |
| Lyme Properties Northwest Limited | Real estate | 2026 |
| M & a Property Dreams Ltd | Real estate | 2010 |
| M & a Subesinghe Limited | Health & social care | 2019 |
| M & LH Holdings Ltd | Real estate | 2016 |
| M & M Beale Limited | Real estate | 1999 |
| M and N Bakery Limited | Hospitality | 2022 |
| M Bridgeman Consulting Ltd | Construction | 2020 |
| M Busby Limited | Health & social care | 2019 |