| Laura Sinead Aesthetics Ltd | Health & social care | 2019 |
| Lauren and Loren Ltd | Other services | 2025 |
| Laurence Industries Ltd | Administrative & support | 2026 |
| Laurent Pernet Consulting Limited | Professional & scientific | 2019 |
| Laus Group Ltd | Professional & scientific | 2018 |
| Lavasource Holdings Ltd | Financial services | 2024 |
| Lavasource Ltd | Administrative & support | 2020 |
| Law Construction Solutions Limited | Administrative & support | 2015 |
| Law Contracts Ltd | Professional & scientific | 2024 |
| Law Plain and Simple Limited | Information & communication | 2005 |
| Lawd Labs Ltd | Administrative & support | 2024 |
| Lawless Networks Limited | Information & communication | 2015 |
| Lawn Land Artificial Grass Limited | Wholesale & retail | 2023 |
| Lawn World Limited | Administrative & support | 2015 |
| Lawshield UK Limited | Financial services | 1997 |
| Lawton Accountancy Ltd | Professional & scientific | 2024 |
| Laxman Solution PVT Ltd | Information & communication | 2025 |
| LAY Writing Services Ltd | Information & communication | 2017 |
| Laycae Electrical Limited | Professional & scientific | 2017 |
| Layermap Ltd | Information & communication | 2020 |
| Layers Resin Flooring Ltd | Construction | 2025 |
| Layla Restaurant Limited | Hospitality | 2025 |
| Layton Fern & Co. Limited | Wholesale & retail | 1953 |
| LB Agile Consultancy Ltd | Other services | 2019 |
| LB Building & Management Limited | Professional & scientific | 2016 |
| LB Ecommerce Ltd | Wholesale & retail | 2024 |
| LB Management Services Limited | Professional & scientific | 2019 |
| LB Regulatory Services Limited | Health & social care | 2011 |
| LB Scans Limited | Health & social care | 2020 |
| LB Twin Investments Limited | Administrative & support | 2017 |
| LBA Consultancy Limited | Real estate | 2025 |
| LBB Developments Limited | Construction | 2023 |
| LBR Education Ltd | Education | 2021 |
| Lbri UK Limited | Financial services | 2016 |
| LC 22 Limited | Real estate | 2020 |
| LC Automotives Ltd | Other services | 2015 |
| LC International 2020 Limited | Hospitality | 2020 |
| LC Recycling Limited | Water & waste | 2017 |
| LC Security Limited | Administrative & support | 2013 |
| LCC Therapeutics Ltd. | Professional & scientific | 2014 |
| LCE Design Limited | Professional & scientific | 2022 |
| LCE Properties NW Limited | Real estate | 2023 |
| LCM IT Consultants Limited | Information & communication | 2017 |
| LCM Property Rentals Limited | Real estate | 2025 |
| Lcps Engineering Limited | Professional & scientific | 2016 |
| LDB Motorsport Designs Ltd. | Administrative & support | 2007 |
| LDM Surveying Services Limited | Professional & scientific | 2025 |
| Ldrr Engineering Limited | Administrative & support | 2024 |
| LDS Marketing Ltd | Professional & scientific | 2019 |
| LDT Property Development Limited | Real estate | 2024 |
| LE & Pham Properties Ltd | Real estate | 2025 |
| LEA Grange Solar Limited | Construction | 2026 |
| Lead Coach Manage Limited | Professional & scientific | 2019 |
| Leadedge Flexo Ltd | Manufacturing | 2009 |
| Leading BMS Ltd | Administrative & support | 2017 |
| Leading Light Consultants Limited | Information & communication | 2007 |
| Leaf Media Solutions Limited | Administrative & support | 2023 |
| Leah TM Ltd | Construction | 2024 |
| Lean Forklift Ltd | Administrative & support | 2026 |
| Lean Hound Consulting Limited | Professional & scientific | 2025 |
| Lean Manufacturing Ltd | Professional & scientific | 2023 |
| Leanne Daniels Limited | Professional & scientific | 2022 |
| Leanne Higgins Limited | Administrative & support | 2017 |
| Leanne.Lcm. Ltd | Professional & scientific | 2024 |
| Leap Coaching Limited | Administrative & support | 2020 |
| Leap Engineering Management Limited | Administrative & support | 2024 |
| Leapnest Limited | Health & social care | 2025 |
| Learnscape Ltd | Education | 2021 |
| LEASE365 Limited | Administrative & support | 2023 |
| Leaton Professional Services Limited | Construction | 2010 |
| Lechu Ltd | Transport & logistics | 2023 |
| Leconfield Personal Services Ltd | Administrative & support | 2023 |
| Ledvance Ltd | Manufacturing | 1985 |
| LEE Barrow Ltd | Administrative & support | 2020 |
| LEE Divall CAD Services Limited | Administrative & support | 2008 |
| LEE Graham Safety Limited | Professional & scientific | 2017 |
| LEE Jensen Rail Ltd | Administrative & support | 2014 |
| LEE Jones Consultancy Limited | Administrative & support | 2024 |
| LEE Remediation Limited | Water & waste | 2007 |
| Lee's Cafe Warrington Ltd | Hospitality | 2022 |
| Lee's Coffee Company Ltd | Hospitality | 2022 |
| Leeda Letting Ltd | Real estate | 2022 |
| Leef Commercial Holdings Limited | Real estate | 2021 |
| Leef Property Management Company Ltd | Real estate | 2010 |
| Leende Legal Consultancy Limited | Professional & scientific | 2021 |
| Leevan Whilby CAD Draughting Services Limited | Administrative & support | 2013 |
| Leewood Consulting Ltd | Professional & scientific | 2018 |
| Lee’S Asian Fresh Food Ltd | Hospitality | 2024 |
| Lefanii Trans Ltd | Transport & logistics | 2020 |
| Lefay (2013) Limited | Professional & scientific | 2013 |
| Legacy Effects UK Limited | Information & communication | 2024 |
| Legal Logic Holdings Ltd | Financial services | 2017 |
| Legal Logic Limited | Information & communication | 2016 |
| Legal News Service Limited | Professional & scientific | 2012 |
| Legalforlandlords Ltd | Administrative & support | 2009 |
| Legba Properties Limited | Real estate | 2021 |
| Legh Street (Warrington) Limited | Construction | 2021 |
| Leghorn Kitchen UK Limited | Hospitality | 2025 |
| Legible Inference Ltd | Information & communication | 2021 |
| Legio-Running Limited | Arts & recreation | 2025 |