| Langer ROO Ltd | Professional & scientific | 2016 |
| Langford Property Solutions Limited | Real estate | 2019 |
| Langley Blinds&Shutters Ltd | Wholesale & retail | 2022 |
| Langthwaite Management Company Limited | Households | 2020 |
| Language Arts Ltd | Education | 2021 |
| Lanichemagique Ltd | Information & communication | 2026 |
| Lanjco Ltd | Wholesale & retail | 2018 |
| Lanovis Capital Partners Ltd | Construction | 2025 |
| Lans Takeaway Limited | Hospitality | 2018 |
| Lansdown Remediation Ltd | Construction | 2022 |
| Lantid Creative UK Ltd | Information & communication | 2024 |
| Lanya Mini Shop Ltd | Wholesale & retail | 2025 |
| Lapwing Energy Limited | Energy | 2015 |
| Lapwing Farms Limited | Agriculture & fishing | 2021 |
| Lapwing Fine Foods Limited | Wholesale & retail | 2019 |
| Lara Bella Margarita Limited | Hospitality | 2025 |
| Laras Food Ltd | Hospitality | 2025 |
| Largo Outsource Solutions Limited | Administrative & support | 2023 |
| Larkspur Dynamics Ltd | Extraterritorial | 2025 |
| Larnu Properties Ltd | Real estate | 2024 |
| Larose Healthcare Ltd | Health & social care | 2025 |
| Larysa Duniec Ltd | Health & social care | 2024 |
| LAS Cleaning & Catering Services Ltd | Administrative & support | 2024 |
| Laser Additive Solutions Ltd | Manufacturing | 2014 |
| Lash & Nail Boutique Limited | Other services | 2014 |
| Lash Ventures Group Ltd | Wholesale & retail | 2025 |
| Lashes&Brows by AM Ltd | Other services | 2025 |
| Lashious Beauty Doncaster Ltd | Other services | 2024 |
| Lastminuteagent Limited | Wholesale & retail | 2025 |
| LAT Rail Tech Limited | Manufacturing | 2018 |
| Latin Triangle Limited | Professional & scientific | 2013 |
| Lattice of Dreams Ltd. | Information & communication | 2025 |
| LAU & FOX Construction Ltd | Construction | 2025 |
| Laufers Trading Ltd | Administrative & support | 2025 |
| Laura Jane Wood Limited | Professional & scientific | 2014 |
| Laura Ormandy BSL Interpreter Ltd | Professional & scientific | 2018 |
| Lauraellise Limited | Wholesale & retail | 2024 |
| Laurentiu Spedition Ltd | Transport & logistics | 2017 |
| Lavender & Linen Ltd | Administrative & support | 2026 |
| Lavender Ice Ltd | Hospitality | 2026 |
| Lavish Lifestyle Consulting Limited | Administrative & support | 2008 |
| Laween Auto Services Limited | Wholesale & retail | 2019 |
| Lawn View Clubhouse Ltd | Hospitality | 2024 |
| Lawnright Ltd | Administrative & support | 2015 |
| Lawnswood Asset Management Ltd | Administrative & support | 2021 |
| Lawson Food Consultancy Limited | Professional & scientific | 2016 |
| Lawtons Capital Ltd | Real estate | 2012 |
| Laxton Management Ltd | Professional & scientific | 2024 |
| Laxton Property Limited | Hospitality | 2005 |
| Layermode Ltd | Information & communication | 2024 |
| Laymore Macadams Limited | Construction | 2002 |
| Layox Business Solutions Ltd | Construction | 2015 |
| Lazar Transit Limited | Transport & logistics | 2019 |
| Lazart Ltd | Wholesale & retail | 2020 |
| Lazenby Shaw Creative Limited | Professional & scientific | 2015 |
| Lazeo Beheer Limited | Other services | 2011 |
| Lazer Security Limited | Construction | 2019 |
| Lazmeni Ltd | Hospitality | 2025 |
| Lazy Driver Ltd | Water & waste | 2021 |
| Lazydollytrans Limited | Transport & logistics | 2025 |
| LB Autos Limited | Wholesale & retail | 2022 |
| LB Cargo Ltd | Transport & logistics | 2025 |
| LB Commercial Consultants Limited | Professional & scientific | 2022 |
| LB Hydraulics Ltd | Manufacturing | 2020 |
| LC Plumbing & Heating Services Limited | Construction | 2021 |
| LCA Delivery Ltd | Transport & logistics | 2021 |
| LCA Electrical Contractors Ltd | Construction | 2021 |
| LCA Projects Ltd | Construction | 2017 |
| Lccgw Ltd | Hospitality | 2023 |
| Lcht Unlimited | Financial services | 2016 |
| LCL & Recruit Limited | Professional & scientific | 2007 |
| LCP Accountancy Ltd | Professional & scientific | 2021 |
| LCP Courier Limited | Transport & logistics | 2025 |
| LCP Financial Adviser Ltd | Professional & scientific | 2025 |
| LCT TM Ltd | Public administration | 2025 |
| LCV Trans Ltd | Transport & logistics | 2018 |
| LCW Property Ltd | Construction | 2026 |
| LDH Engineering Solutions Limited | Professional & scientific | 2017 |
| LDM Plumbing & Heating Services Limited | Construction | 2021 |
| LDS Accounting Services Ltd | Professional & scientific | 2024 |
| LDS Solutions Ltd | Wholesale & retail | 2021 |
| LDW Properties Ltd | Real estate | 2019 |
| LE Gasp Productions Ltd | Arts & recreation | 2023 |
| LE GAT Caillaud Ltd | Real estate | 2003 |
| Lead Bubble Limited | Financial services | 2019 |
| Lead Management Services Limited | Professional & scientific | 2014 |
| Lead Perfect Limited | Financial services | 2014 |
| Lead Signal Ltd | Professional & scientific | 2026 |
| Leader Lead Ltd | Professional & scientific | 2022 |
| Leading Services Limited | Wholesale & retail | 2024 |
| Leaf Property Solutions Ltd | Construction | 2023 |
| Leaf&Lintel Properties Ltd | Real estate | 2026 |
| Leafy Browse Solutions Ltd | Extraterritorial | 2023 |
| Leah Bakes Ltd | Manufacturing | 2022 |
| Lealsap Invest Limited | Financial services | 2019 |
| Lealsap Limited | Information & communication | 2016 |
| Lean Domains Ltd | Professional & scientific | 2008 |
| Lean OPS Limited | Professional & scientific | 2025 |
| Leana 12 Limited | Transport & logistics | 2019 |
| Leanne's Lambs Ltd | Agriculture & fishing | 2025 |