| Lawson Carswell Limited | Hospitality | 2017 |
| Lawton-Hives Properties Ltd | Real estate | 2026 |
| Layers Carpets and Flooring Ltd | Wholesale & retail | 2020 |
| Layhe’S Car Company Ltd | Wholesale & retail | 2026 |
| Lazer Projects Ltd | Professional & scientific | 2023 |
| Lazer Station.Com Ltd | Information & communication | 2007 |
| Lazerleaf Ltd | Information & communication | 2023 |
| Laziole Group Ltd | Information & communication | 2025 |
| Lazyjobber Ltd | Professional & scientific | 2025 |
| LB Cars Limited | Wholesale & retail | 2003 |
| LB Outdoor Maintenance Ltd | Administrative & support | 2024 |
| LBB Holdings Ltd | Professional & scientific | 2017 |
| LBH Herbals Solutions UK Ltd | Other services | 2023 |
| LBH Logistics and Projects Limited | Transport & logistics | 2024 |
| LBR Window Cleaning Ltd | Administrative & support | 2022 |
| LC Property Management Ltd | Real estate | 2021 |
| Lcad Ltd | Transport & logistics | 2023 |
| LCM Estates Ltd | Real estate | 2022 |
| LCM Property Services Ltd | Construction | 2021 |
| LCO & Co Limited | Information & communication | 2018 |
| LD Structural Examinations Ltd | Construction | 2017 |
| LD Ventures Ltd | Professional & scientific | 2024 |
| LDA Logistics Limited | Transport & logistics | 2019 |
| LDC Property Management Ltd | Real estate | 2021 |
| LDH Contracts Ltd | Construction | 2022 |
| LDH Plant Ltd | Administrative & support | 2026 |
| Ldjs Lettings Limited | Real estate | 2025 |
| Ldll CAD Services Ltd | Information & communication | 2019 |
| LDM Financial Limited | Financial services | 2026 |
| LDS Holdings Yorkshire Limited | Professional & scientific | 2024 |
| LDT Investments Ltd | Financial services | 2019 |
| LDV Holdings Ltd | Financial services | 2024 |
| Lead the Waves Ltd | Real estate | 2022 |
| Leading Edge Health Ltd | Professional & scientific | 2023 |
| Lean Civil Engineering Ltd | Administrative & support | 2017 |
| Lean Data Consulting Ltd | Information & communication | 2023 |
| Lean Solutions for Business Limited | Professional & scientific | 2015 |
| Leanne Hall Football Coaching Limited | Arts & recreation | 2025 |
| Learners First Schools Partnership Limited | Education | 2012 |
| Ledmore Estates Limited | Real estate | 2025 |
| Ledmore Forest Estates Limited | Real estate | 2025 |
| LEE Estates & Co Ltd | Real estate | 2020 |
| LEE Greaves Plumbing & Heating Limited | Construction | 2025 |
| LEE Hackett & Associates Limited | Health & social care | 2016 |
| LEE Hall Transport Limited | Transport & logistics | 2014 |
| LEE Haywood Rail Services Limited | Construction | 2016 |
| LEE Payne Electrical Limited | Construction | 2011 |
| LEE Raistrick Ltd | Construction | 2019 |
| LEE Smith Transport Limited | Transport & logistics | 2023 |
| Lee's Haulage Ltd | Transport & logistics | 2011 |
| Leebody Consulting Limited | Professional & scientific | 2024 |
| Leebus Auto Electrics Limited | Wholesale & retail | 2002 |
| Leech Utilities Ltd | Construction | 2019 |
| Leedar Automotive Limited | Wholesale & retail | 2010 |
| Leeds Auction House Limited | Wholesale & retail | 2024 |
| Leeds EYE Clinic Limited | Wholesale & retail | 2023 |
| Lees Accounting Limited | Professional & scientific | 1991 |
| Leeway Approach Limited | Professional & scientific | 2010 |
| Legacy Bars Limited | Hospitality | 2022 |
| Legacy Jewellers Ltd. | Wholesale & retail | 2026 |
| Legacy Renovations Limited | Real estate | 2019 |
| Legacy Rental Properties Limited | Real estate | 2025 |
| Legacy Sport for ALL CIC | Education | 2024 |
| Legacy Sport Yorkshire Ltd | Education | 2024 |
| Legal Business Development & Advisory Ltd | Administrative & support | 2017 |
| Legal Marketing Experts (UK) Limited | Administrative & support | 2010 |
| Legend Barbershop Ltd | Other services | 2018 |
| Leger Air Holidays Limited | Administrative & support | 1994 |
| Leger Holidays Limited | Administrative & support | 1979 |
| Leger Shearings Group (Property) Limited | Professional & scientific | 2007 |
| Leger Shearings Group Holdings Limited | Financial services | 2019 |
| Leger Shearings Group Limited | Administrative & support | 1987 |
| Leger Shearings Group Topco Ltd | Financial services | 2024 |
| Lehto Consulting Ltd | Information & communication | 2019 |
| Leighman Publications Ltd | Manufacturing | 2020 |
| Leighton Drive Limited | Administrative & support | 2014 |
| Leighton Property Ltd | Real estate | 2023 |
| Leighton Vans Limited | Wholesale & retail | 2008 |
| Lemonaid Holdings Limited | Financial services | 2023 |
| Lemonaid Motor Legal Ltd | Financial services | 2018 |
| Lemont-Capital Limited | Professional & scientific | 2023 |
| Lems Property Limited | Real estate | 2021 |
| Lemy Innovations Ltd | Information & communication | 2026 |
| Lenidris Ltd | Professional & scientific | 2014 |
| Lenzkes Clamping Tools (GB) Limited | Extraterritorial | 2009 |
| Leoalex Company Limited | Health & social care | 2022 |
| Leodenna Limited | Health & social care | 2023 |
| Leodis Real Estate Ltd | Professional & scientific | 2023 |
| Leon Elite Ltd | Professional & scientific | 2024 |
| LER Ltd | Manufacturing | 1978 |
| Lerali Ltd | Professional & scientific | 2024 |
| LET Yorkshire Ltd | Real estate | 2022 |
| Let's Pollinate Limited | Administrative & support | 2021 |
| Levantar AI Limited | Information & communication | 2025 |
| Levick Consultants Ltd | Professional & scientific | 2015 |
| Levsta Labs Ltd | Information & communication | 2025 |
| Lewis James Accountants Ltd | Professional & scientific | 2004 |
| Lexea Bookkeeping Ltd | Professional & scientific | 2021 |
| Lexea Legal Ltd | Professional & scientific | 2020 |
| Lexicon Heritage Ltd | Other services | 2011 |