| L1TECOIN Limited | Extraterritorial | 2021 |
| L1VVY Ltd | Extraterritorial | 2020 |
| LA Maison DU Cafe Limited | Wholesale & retail | 2005 |
| Labcentral Ltd | Manufacturing | 2016 |
| Labcorp Early Development Laboratories Limited | Professional & scientific | 1974 |
| Labonte Studios Ltd | Information & communication | 2026 |
| Laborare Group Limited | Administrative & support | 2016 |
| Laborare Holdings Limited | Real estate | 2021 |
| Laburnum Caravan Park Limited | Hospitality | 2019 |
| Lacb Limited | Real estate | 2025 |
| Lacey Consultancy Limited | Administrative & support | 2012 |
| Ladyroyd Trustees Limited | Administrative & support | 2025 |
| Laeta Investments Limited | Real estate | 2017 |
| LAH Consultants Limited | Professional & scientific | 2022 |
| Laidlaws Investments Ltd | Real estate | 1996 |
| Laithes Limited | Manufacturing | 2004 |
| Lake Como Limited | Extraterritorial | 2011 |
| Lambard Limited | Extraterritorial | 2025 |
| Lambert House Management Company Limited | Households | 2023 |
| Lambs Properties Ltd | Real estate | 2022 |
| Lamifoil Limited | Wholesale & retail | 1998 |
| Lamlac Ltd | Financial services | 2004 |
| Lancashire County Transport Limited | Transport & logistics | 2001 |
| Lancashire United Limited | Transport & logistics | 1990 |
| Lancaster Property Consulting Ltd. | Real estate | 2016 |
| Lancia Limited | Mining & quarrying | 2011 |
| Land Acquisitions Limited | Real estate | 1994 |
| Landagate Limited | Agriculture & fishing | 2020 |
| Landed Investments Limited | Real estate | 2005 |
| Landemerke Limited | Agriculture & fishing | 2022 |
| Landlord Development & Finance Services Limited | Construction | 2012 |
| Landman Group Limited | Real estate | 2026 |
| Landscape Diversity Limited | Real estate | 2023 |
| Landscape Lighting Ltd | Construction | 2023 |
| Landwork Group Ltd | Administrative & support | 2020 |
| Langcliffe Consulting Ltd | Professional & scientific | 2018 |
| Langcliffe Court Maintenance Limited | Households | 1986 |
| Langcliffe Management Company Limited | Households | 2022 |
| Langcliffe Place Ltd | Households | 2011 |
| Langham Place (Freehold) Limited | Real estate | 2009 |
| Langham Place (Harrogate) Management Company Limited | Households | 2001 |
| Langroyd Logistics Ltd | Transport & logistics | 2024 |
| Lanovita Limited | Professional & scientific | 2010 |
| Lansgate Limited | Information & communication | 2016 |
| Lanshaw (Harrogate) Limited | Real estate | 2017 |
| Lanshaw Developments Limited | Construction | 2017 |
| Lanshaw Property Group Limited | Financial services | 2017 |
| Lantac UK Limited | Wholesale & retail | 2019 |
| Lapicida (Stone Productions) Ltd | Professional & scientific | 2010 |
| Lapicida Group Limited | Professional & scientific | 2024 |
| Lapicida Limited | Professional & scientific | 2010 |
| Lapicida Stone Group Limited | Wholesale & retail | 2011 |
| Lapicida Stone Limited | Professional & scientific | 2011 |
| Lapis Builders Harrogate Limited | Construction | 2023 |
| Laptoprefurbishers Ltd | Other services | 2024 |
| Larchtrees Property Group Limited | Financial services | 2025 |
| Large Business Limited | Extraterritorial | 2013 |
| Lark Cleaning Services Ltd | Administrative & support | 2012 |
| LAS Administration Limited | Administrative & support | 2009 |
| Lastlook Limited | Health & social care | 2010 |
| Lastpass UK Ltd | Information & communication | 2021 |
| Latimer Opco Limited | Hospitality | 2020 |
| Latoe Limited | Administrative & support | 2025 |
| Laughlines Limited | Other services | 2000 |
| Launch Fulfilment UK Ltd | Other services | 2025 |
| Laura Crompton Design Ltd | Professional & scientific | 2021 |
| Laura Hart Ltd | Other services | 2019 |
| Laura LEE Hair Limited | Other services | 2013 |
| Laurel Tree Holdings Ltd | Real estate | 2026 |
| Lavender Commercial Properties Ltd | Real estate | 2014 |
| Lavigne Limited | Wholesale & retail | 2022 |
| Lawgra (NO. 1090) Limited | Financial services | 2004 |
| Lawgra (NO.1087) Limited | Health & social care | 2004 |
| Lawgra (NO.1088) Limited | Real estate | 2004 |
| Lawrence & Barnes Ltd | Wholesale & retail | 2023 |
| Lawrence Court (Harrogate) Limited | Real estate | 2012 |
| Lawrentino Limited | Extraterritorial | 2026 |
| Lawson Marsh Limited | Extraterritorial | 2025 |
| Lawson Warner Limited | Extraterritorial | 2025 |
| Lawson Warwick Limited | Extraterritorial | 2025 |
| LB Game and Rearing Limited | Agriculture & fishing | 2018 |
| LB Gscp Ltd | Health & social care | 2026 |
| LBS (Yorkshire) Ltd | Manufacturing | 2021 |
| Lbsg Ltd. | Manufacturing | 2021 |
| LBW Squash Limited | Arts & recreation | 2025 |
| LC Property Maintenance Limited | Households | 2025 |
| LCR International Ltd | Administrative & support | 2019 |
| Lcrm Limited | Professional & scientific | 2009 |
| LE Masters Engineering Consulting Ltd | Professional & scientific | 2014 |
| Le-Corbuiser Limited | Extraterritorial | 2026 |
| Lead Turnip Limited | Professional & scientific | 2023 |
| Leaf and Lemon Limited | Administrative & support | 2025 |
| Leamington House (Harrogate) Ltd | Households | 2003 |
| Leanopex Limited | Professional & scientific | 2017 |
| Learn Events Ltd | Administrative & support | 2024 |
| LEARN2EARN Teachers Limited | Education | 2023 |
| Learners World Ltd | Education | 2013 |
| Leckby Holdings Ltd | Real estate | 2025 |
| Lecton Ltd | Professional & scientific | 2017 |
| Ledston Estate Game | Extraterritorial | 2013 |