| Lauren Elliott Designs Limited | Professional & scientific | 2020 |
| Laurenbell Limited | Real estate | 1984 |
| Lauristons Estate Agents Limited | Professional & scientific | 2003 |
| Lavender Black Event Construction Limited | Construction | 2011 |
| Lavender Fields (South Wootton) Residents Management Company Ltd | Households | 2022 |
| Lavender Fields Care Village Limited | Health & social care | 2021 |
| Lavenderland Limited | Manufacturing | 2002 |
| Lavenderworld Limited | Wholesale & retail | 2001 |
| Laverack Joinery Limited | Manufacturing | 2001 |
| Law 33 Limited | Administrative & support | 2020 |
| Law Contracting Ltd | Construction | 2022 |
| Lawbright Legal Services Limited | Extraterritorial | 2016 |
| Lawify Chambers Ltd | Real estate | 2024 |
| Lawlors Property Services Limited | Financial services | 1995 |
| Lawn Pigs Limited | Agriculture & fishing | 2012 |
| Lawnmower Services Easingwold Limited | Wholesale & retail | 2025 |
| Lawnmower Services York Limited | Manufacturing | 2012 |
| Lawrence & Benham Limited | Real estate | 2020 |
| Lawrence & Pinkerton Limited | Health & social care | 2011 |
| Lawrence Square Management Company York Limited | Households | 2003 |
| Lawtex Projects Ltd | Administrative & support | 2007 |
| Lawtex Solutions Ltd | Administrative & support | 2023 |
| Laya Skincare Ltd | Wholesale & retail | 2025 |
| Layerthorpe Management Company Limited | Administrative & support | 2003 |
| Layerthorpe One Ltd | Construction | 2021 |
| Lazarus Medical Limited | Health & social care | 2010 |
| Lazenbybrown Digital Limited | Professional & scientific | 2016 |
| Lazenbybrown Ltd | Professional & scientific | 2003 |
| Lazy Acre Investments Limited | Extraterritorial | 1958 |
| Lazy Goat Bars Limited | Hospitality | 2023 |
| Lazy Hippo Company Limited | Real estate | 2021 |
| LB ACP Ltd | Public administration | 2026 |
| LB Scaffolding (York) Ltd | Construction | 2023 |
| LBD & Associates Ltd | Information & communication | 2011 |
| LBI Capital Limited | Extraterritorial | 2025 |
| LBW Tutoring Ltd | Extraterritorial | 2024 |
| LC Bunting Ltd | Professional & scientific | 2025 |
| Lcdc Holdco Limited | Financial services | 2024 |
| LCE Dental Limited | Health & social care | 2025 |
| Lcom Ltd | Information & communication | 2026 |
| LCS Property Maintenance Limited | Construction | 2016 |
| LDJ Refrigerated Transport Ltd | Transport & logistics | 2021 |
| Ldmh Holding Ltd | Extraterritorial | 2025 |
| Ldny Group Limited | Administrative & support | 2022 |
| LDNY360 Limited | Professional & scientific | 2023 |
| LDR Biotechnology (UK) Ltd | Professional & scientific | 2025 |
| LDR Rentals Limited | Real estate | 2022 |
| LDT Rail Ltd | Administrative & support | 2011 |
| LE Petit Rustique Limited | Hospitality | 2026 |
| LE Specialty Ltd | Hospitality | 2024 |
| LE Torchon Limited | Hospitality | 2024 |
| Lead Property Investments Limited | Real estate | 2013 |
| Leadership Talent PTY Ltd | Administrative & support | 2023 |
| Leading Edge Accountancy Solutions Limited | Professional & scientific | 2017 |
| Leading Edge Legal Solutions Ltd | Professional & scientific | 2020 |
| Leaf Environmental Ltd | Professional & scientific | 2024 |
| Leaf Seeds (Groundscare) Ltd | Wholesale & retail | 2021 |
| Leaf Translations Ltd | Professional & scientific | 2021 |
| Leafletts Ltd | Households | 2024 |
| Leagrave Clinic Limited | Health & social care | 2013 |
| League Weekly Ltd | Manufacturing | 2007 |
| Lean Practice Ltd | Administrative & support | 2010 |
| Lean TPM Solutions Limited | Professional & scientific | 2013 |
| Leanne Clegg Counselling Ltd | Health & social care | 2020 |
| Leap and Roar (Property) Limited | Real estate | 2025 |
| Leap and Roar Limited | Real estate | 2017 |
| Learn Driving UK Limited | Education | 2014 |
| Learnerp.Uk Ltd | Other services | 2023 |
| LEARNING4LIFE Education Limited | Information & communication | 2025 |
| Leasepark Property Management Limited | Households | 1990 |
| Leathley Management Limited | Real estate | 2015 |
| Lebaneat (Yarm) Limited | Hospitality | 2018 |
| Ledgerly Learning Ltd | Professional & scientific | 2025 |
| Ledo Consulting Ltd | Administrative & support | 2025 |
| LEE & Micklethwait Ltd | Construction | 2007 |
| LEE Harper Holt LLP | | 2018 |
| LEE Holland Trading Limited | Wholesale & retail | 2003 |
| LEE Martell Ltd | Construction | 2013 |
| LEE Robinson Property Finance Ltd | Financial services | 2023 |
| Lee-Bursnall Limited | Information & communication | 2013 |
| Leebell Developments Limited | Construction | 1986 |
| Leech Homes (Showhouses) Limited | Extraterritorial | 1980 |
| Leech Homes (Wales) Limited | Extraterritorial | 1956 |
| Leech Homes (Yorkshire) Limited | Extraterritorial | 1978 |
| Leech Homes Limited | Extraterritorial | 1936 |
| Leech Northumbria Limited | Extraterritorial | 1979 |
| Leech Partnership Homes Limited | Extraterritorial | 1980 |
| Leeds Lighting Design Limited | Extraterritorial | 1999 |
| Leeds Radiology Group LLP | | 2016 |
| Leeds Retrofits Ltd | Manufacturing | 2015 |
| Leeds TAP Ltd | Hospitality | 2013 |
| Leeds Test Objects Limited | Manufacturing | 2001 |
| Leeds York Building Company Ltd | Construction | 2015 |
| Leeman Apartments Management Company Limited | Households | 1986 |
| Leeman Developments Ltd | Construction | 2019 |
| Leeman Road Management Company Limited | Households | 2001 |
| Leeming Masonry Limited | Construction | 2017 |
| Leeming Solutions Ltd | Manufacturing | 2018 |
| Leeper & Deighton Limited | Construction | 2013 |
| Leero Ltd | Professional & scientific | 2015 |