| Lambeth Lighting Services Limited | Other services | 2004 |
| Lambs IT Services Ltd | Information & communication | 2019 |
| Lambton Clothing Company Partners LLP | | 2012 |
| Lamming Investments NO1 Ltd | Professional & scientific | 2024 |
| Lamond Intellectual Property Ltd | Professional & scientific | 2013 |
| Lamont Corporate Finance Limited | Professional & scientific | 2016 |
| Lampshoponline Ltd | Wholesale & retail | 2011 |
| Lan's Sweet Bakery Ltd | Manufacturing | 2025 |
| Lanadec Limited | Real estate | 1970 |
| Lanca Flooring Limited | Wholesale & retail | 2019 |
| Lancashire Leather Factors Limited(The) | Professional & scientific | 1950 |
| Lancaster's Bakery Limited | Wholesale & retail | 2003 |
| Lancastre Assets Ltd | Real estate | 2025 |
| Land and Home Developments Limited | Real estate | 2014 |
| Land Design Ltd | Extraterritorial | 2015 |
| Land Elevate Limited | Real estate | 2026 |
| Land Harrison Consultancy Limited | Professional & scientific | 2026 |
| Land Investments (North East) | Real estate | 2010 |
| Land Investments (North East) Holdings | Financial services | 2024 |
| Land Light Limited | Construction | 2001 |
| Land of Furniture Ltd | Wholesale & retail | 2023 |
| Land on Civil Engineering Ltd | Construction | 2022 |
| Land Polymers Limited | Water & waste | 1999 |
| Land Regeneration Management Limited | Professional & scientific | 1996 |
| Land Restoration Ltd | Transport & logistics | 2019 |
| Landa Stores Limited | Wholesale & retail | 2012 |
| Landale (Leeds) Limited | Professional & scientific | 2020 |
| Landing Sanneh Ltd | Health & social care | 2015 |
| Landlab Development Ltd | Construction | 2022 |
| Landlord Assistance Limited | Real estate | 2015 |
| Landlord Direct Let's Limited | Real estate | 2018 |
| Landlord Supplies Ltd | Wholesale & retail | 2023 |
| Landlord Supplies Yorkshire Limited | Other services | 2017 |
| Landmark (U.K.) Limited | Real estate | 1981 |
| Landmark Estates Limited | Real estate | 1988 |
| Landmark Homes Lettings Ltd | Real estate | 2002 |
| Landmark House Management (Leeds Tower) Ltd | Real estate | 2012 |
| Landmark House Management (Leeds) Limited | Households | 2000 |
| Landmark Investment Property Ltd | Real estate | 2022 |
| Landmark Properties (GB) Ltd | Households | 1998 |
| Landmark Property Services (Leeds) Ltd | Real estate | 2014 |
| Landmark Residential Lettings Ltd | Financial services | 2024 |
| Landmark Solicitors LLP | | 2008 |
| Landquay Services Limited | Professional & scientific | 1998 |
| Landreyhayes Ltd | Real estate | 2022 |
| Landscape Paving Yeadon Ltd | Extraterritorial | 2009 |
| Landscape Seeding Services Limited | Administrative & support | 2008 |
| Landscapes by Design (Yorkshire) Limited | Administrative & support | 2025 |
| Landsrigg Limited | | 1982 |
| Landstem Ltd | Real estate | 2023 |
| Lane END Croft Limited | Households | 1978 |
| Lane END Farmshop Limited | Wholesale & retail | 2014 |
| Lane Properties Yorkshire LLP | | 2006 |
| Lanehead Limited | Hospitality | 2017 |
| Lanehead Management Company Limited | Extraterritorial | 1991 |
| Lanes Bits Ltd | Wholesale & retail | 2023 |
| Lanes for Drains Limited | Professional & scientific | 1992 |
| Lanes Group Limited | Water & waste | 1999 |
| Lanes-I Limited | Information & communication | 2016 |
| Laneside Property Ltd | Construction | 2022 |
| Langa Health and Wellbeing Ltd | Health & social care | 2015 |
| Langbar Mews Limited | Households | 2017 |
| Langdale Close Properties Limited | Real estate | 2004 |
| Langdale Holdco Limited | Information & communication | 2024 |
| Langdale Park (Woodlesford) Management Company Limited | Households | 2007 |
| Langford Made Ltd | Professional & scientific | 2025 |
| Langley and Brading Ltd | Other services | 2011 |
| Langley Film Limited | Information & communication | 2014 |
| Langston Royce Ltd | Administrative & support | 2026 |
| Langtech Academy Ltd | Education | 2025 |
| Langton Cottages Ltd | Real estate | 2021 |
| Langton Holdings Limited | Real estate | 2015 |
| Langton London Insurance Brokers Ltd | Financial services | 2015 |
| Langton's Wharf RTM Company Limited | Households | 2004 |
| Langtons Wharf Freehold Company Limited | Real estate | 2017 |
| Language and Learning Consultant Limited | Education | 2013 |
| Language Expertise Limited | Professional & scientific | 2012 |
| Languifang Ltd | Hospitality | 2022 |
| Langurra Trading Ltd | Hospitality | 2022 |
| Langwith Valley Limited | Construction | 2025 |
| Lani Enterprise Limited | Manufacturing | 2023 |
| Laniakea Networks Ltd | Information & communication | 2022 |
| Lannutti UK Limited | Transport & logistics | 2025 |
| Lano Noodle Ltd | Hospitality | 2026 |
| Lansdowne Paving & Driveways Limited | Construction | 2024 |
| Lansinoh Laboratories UK Limited | Wholesale & retail | 2019 |
| Lantern 6 Studios Ltd | Information & communication | 2023 |
| Laobak Limited | Real estate | 2020 |
| Lapage Development Consultants Limited | Construction | 1985 |
| Lapis Investments Limited | Real estate | 2021 |
| Lapis Litigation Limited | Professional & scientific | 2023 |
| Lapwing Properties Ltd | Real estate | 2020 |
| Lapwing Services Ltd | Administrative & support | 2025 |
| LAQ Investments Ltd | Real estate | 2023 |
| LAQ Solutions Ltd | Professional & scientific | 2023 |
| Lara Homes Ltd | Real estate | 2017 |
| Laranja Ltd | Information & communication | 2017 |
| Larchfall Property Holdings Ltd | Real estate | 2023 |
| Larger US Ltd | Education | 2020 |
| Larisa Sirbu Limited | Manufacturing | 2022 |