| Landcheck Limited | Real estate | 1998 |
| Landel Limited | Health & social care | 2020 |
| Landlord Asset Solutions Ltd | Financial services | 2016 |
| Landlord Direct Ltd | Administrative & support | 2011 |
| Landlord Eviction Service Ltd | Professional & scientific | 2025 |
| Landlord Freedom Ltd | Hospitality | 2025 |
| Landlord Heaven Limited | Real estate | 2023 |
| Landmark Aesthetics Clinic Ltd | Health & social care | 2021 |
| Landmark Franchise Limited | Real estate | 2018 |
| Landmark Place (Management) Limited | Households | 2000 |
| Landmark Private Wires Limited | Energy | 2026 |
| Landmark Properties Ltd | Administrative & support | 1998 |
| Landmark UK Developments Limited | Construction | 2021 |
| Landon Lets Limited | Real estate | 2018 |
| Landong Limited | Financial services | 2021 |
| Lands Down Fielding Limited | Other services | 2019 |
| Landsker Investments Ltd | Financial services | 2021 |
| Landsker Projects Ltd | Construction | 2021 |
| Landstrategy Ltd | Professional & scientific | 2024 |
| Landward Ltd | Hospitality | 2026 |
| Lane Acer Limited | Professional & scientific | 2010 |
| Lane Ters (UK) Pastoral Agriculture Technology Group Co., Ltd | Mining & quarrying | 2024 |
| Laneige Cosmetics Ltd | Wholesale & retail | 2024 |
| Laneta Solutions Ltd | Wholesale & retail | 2021 |
| Lanfy Limited | Wholesale & retail | 2025 |
| Langan Scott and Co Ltd | Extraterritorial | 2020 |
| Langdon FOX Limited | Professional & scientific | 2018 |
| Langford Communications Limited | Professional & scientific | 2014 |
| Langford Services Limited | Wholesale & retail | 2025 |
| Langford Turnbull Limited | Financial services | 2011 |
| Langham Health Limited | Health & social care | 2009 |
| Langlands & Pearse Ltd | Wholesale & retail | 2024 |
| Langley Maintenance Solutions Limited | Manufacturing | 2025 |
| Langley Plumbing (Services) Limited | Construction | 2011 |
| Langmead Lifestyles Limited | Health & social care | 2015 |
| Langsett Greaves Ltd | Wholesale & retail | 2022 |
| Langstone Construction Group Ltd | Construction | 2020 |
| Langstone Developments Limited | Construction | 2023 |
| Langstone Group Ltd | Financial services | 2024 |
| Langstone Homes Limited | Real estate | 2022 |
| Langton Place Management Company Limited | Real estate | 1994 |
| Langtry Blast Commerce Technologies Ltd | Extraterritorial | 2021 |
| Language Academy Wales | Education | 2015 |
| Language Access Ltd | Professional & scientific | 2025 |
| Language Works Limited | Extraterritorial | 2013 |
| Lanky Lampy Productions Ltd | Arts & recreation | 2026 |
| Lanos Services Limited | Administrative & support | 2023 |
| Lanqin Business Limited | Wholesale & retail | 2024 |
| Lansarin International Ltd | Professional & scientific | 2025 |
| Lansdown Cardiff Limited | Real estate | 2010 |
| Lansdowne House (Penarth) Management Company Limited | Households | 2001 |
| Lansdowne Road Garage Limited | Wholesale & retail | 2017 |
| Lansdowne-Place Development Limited | Construction | 2018 |
| Lanshine Limited | Wholesale & retail | 2025 |
| Lanslow Consulting Ltd | Other services | 2019 |
| Lantada Consulting Ltd | Information & communication | 2025 |
| Lantana Limited | Real estate | 2021 |
| Lantern Line Saas Ltd | Information & communication | 2025 |
| Lantern Supplies Ltd | Wholesale & retail | 2016 |
| Laojia Trading Co., Ltd | Wholesale & retail | 2024 |
| LAP Catering Limited | Hospitality | 2005 |
| Lapelcreations Ltd | Administrative & support | 2025 |
| Laperelle Cosmetics Co., Ltd. | Wholesale & retail | 2019 |
| Laphub Ltd | Wholesale & retail | 2025 |
| Lapictures Ltd | Information & communication | 2024 |
| Lapoca Ltd | Arts & recreation | 2025 |
| Laportine Ltd | Wholesale & retail | 2025 |
| Laptop Parts UK Ltd | Administrative & support | 2019 |
| LAR Cooperativa Agroindustrial Ltd | Professional & scientific | 2018 |
| Lara Adkins Vintage Ltd | Wholesale & retail | 2024 |
| Lara LAU Limited | Transport & logistics | 2012 |
| Laraka Ltd | Hospitality | 2018 |
| Larayz Electrical Limited | Manufacturing | 2026 |
| Larchwood Investments Limited | Real estate | 2006 |
| Larcombe Consultancy Ltd | Professional & scientific | 2013 |
| Lardysoft Limited | Information & communication | 2004 |
| Lareen Ltd | Health & social care | 2015 |
| Larena Car Wash Ltd | Wholesale & retail | 2025 |
| Larimar Limited | Information & communication | 2023 |
| Larini Car Sales Ltd | Wholesale & retail | 2021 |
| Laristo Ltd | Information & communication | 2024 |
| Lark House Medical Ltd | Health & social care | 2024 |
| Larkfield Park Estates Ltd | Households | 2001 |
| Larkstead Limited | Wholesale & retail | 2025 |
| Larp Arena Ltd | Wholesale & retail | 2023 |
| LAS Group Limited | Transport & logistics | 2025 |
| LAS Systems Limited | Administrative & support | 2018 |
| Lascoma PC | | 2018 |
| Lase Enterprises Ltd | Health & social care | 2018 |
| Laser Clinic TWENTY2 Ltd | Other services | 2022 |
| Laser Hair Removal Ltd | Other services | 2026 |
| Laser Thairapy Limited | Other services | 2024 |
| Laserboehm Limited | Information & communication | 2018 |
| Laserlec Services (UK) Ltd | Manufacturing | 2013 |
| Lasershield Holdings Ltd | Administrative & support | 2024 |
| Laserwise Skin & Beauty Clinic Ltd | Other services | 2014 |
| Lash & Lube Ltd | Wholesale & retail | 2025 |
| Lash Land Ltd | Wholesale & retail | 2019 |
| Lashes by Marns Ltd | Other services | 2019 |
| Lass Software Limited | Information & communication | 2023 |