| LA Romani Ltd | Wholesale & retail | 2026 |
| LA Terasa Limited | Hospitality | 2022 |
| LA Zouche Design Ltd | Professional & scientific | 2020 |
| Labels INK Limited | Wholesale & retail | 2015 |
| Lacey Utilities Ltd | Construction | 2022 |
| Laconic Solutions Ltd | Information & communication | 2018 |
| Lacroix Property Ltd | Construction | 2026 |
| Laguna Resources Ltd | Other services | 2025 |
| Lahori Properties Limited | Real estate | 2024 |
| Laird Resources LLP | | 2009 |
| Lake House Event Planners Limited | Health & social care | 2022 |
| Lakeside Properties Ltd | Real estate | 2026 |
| Lakeside@Ourplace Limited | Education | 2018 |
| Lala Pizza Limited | Hospitality | 2024 |
| Lalaaestheticsuk Limited | Health & social care | 2025 |
| LAM Group Ltd | Hospitality | 2015 |
| LAM Group Services Ltd | Real estate | 2019 |
| Lambroocs Resources Limited | Wholesale & retail | 2024 |
| Lammar Ltd | Wholesale & retail | 2019 |
| Lammas Absolute Design Ltd | Professional & scientific | 2014 |
| Lamperns Ltd | Hospitality | 2018 |
| Lancaster Investment Property Ltd | Hospitality | 2010 |
| Land Trax Limited | Administrative & support | 2024 |
| Landmarc (UK) Ltd | Professional & scientific | 2014 |
| Lane Media Ltd | Information & communication | 2012 |
| Lanebarn Limited | Wholesale & retail | 2001 |
| Langley Caravan Holidays Ltd | Hospitality | 2024 |
| Langley Performance Limited | Professional & scientific | 2023 |
| Lansdowne Court Limited | Hospitality | 1981 |
| Laptree Ltd | Hospitality | 2023 |
| Lapwing Holdings Limited | Financial services | 2018 |
| Larch Wood Capital Limited | Financial services | 2017 |
| Larissa Transport Ltd | Transport & logistics | 2022 |
| Lark Atkin-Davies Limited | Administrative & support | 2025 |
| Lark Hill Road Management Company Limited | Other services | 2019 |
| Laser Sharp Music Ltd | Information & communication | 2026 |
| Laserase Clinic Ltd | Other services | 2023 |
| Lathe Trays Limited | Administrative & support | 1953 |
| Laugherne House Management Ltd | Households | 2012 |
| Laugherne Park Management Services Limited | Households | 2003 |
| Lauke Ltd | Wholesale & retail | 2024 |
| Launch Brands Limited | Professional & scientific | 2025 |
| Laura B Saddles Ltd | Wholesale & retail | 2025 |
| Lauravbrown Sports Management Ltd | Arts & recreation | 2024 |
| Laurel Residential Homes Limited | Other services | 1997 |
| Laurentiu Dragos Services Limited | Transport & logistics | 2016 |
| Lavender Care Group Limited | Health & social care | 2023 |
| Lavish Loos LLP | | 2020 |
| Law Web Limited | Information & communication | 2014 |
| Lawnkeeper Worcester Limited | Administrative & support | 2019 |
| Lawrence & Co. (Commercial Estates) Ltd | Real estate | 2020 |
| Lawrence and Sons Building Ltd | Construction | 2014 |
| Lawyer Select Limited | Professional & scientific | 2000 |
| Lawyers Defence Union Limited | Professional & scientific | 2006 |
| Lawyers Protection Scheme Limited | Professional & scientific | 2006 |
| Laylocks Nurseries and Garden Centre Limited | Administrative & support | 2003 |
| Layrs Group Ltd | Information & communication | 2025 |
| Lazlo Ltd | Financial services | 2020 |
| Lazy Chef Ltd | Manufacturing | 2022 |
| Lazy Uncle Limited | Wholesale & retail | 2022 |
| LB Collects Ltd | Wholesale & retail | 2025 |
| LBM Solutions Limited | Professional & scientific | 2009 |
| Lbwr Property Management Ltd | Households | 2025 |
| LCM Holdings (London) Ltd | Financial services | 2024 |
| Lcmm Services Ltd | Construction | 2026 |
| LDA Productions Limited | Information & communication | 2023 |
| LDW Safety Services Ltd | Public administration | 2018 |
| LE Bien-Etre Ltd | Arts & recreation | 2025 |
| LE Tigre UK Limited | Wholesale & retail | 2021 |
| LEA Farm Company Limited | Agriculture & fishing | 2011 |
| Leading Energy Limited | Extraterritorial | 2009 |
| Leading Marketing Company Limited | Professional & scientific | 2015 |
| Lean Transition Solutions Limited | Professional & scientific | 2009 |
| Leap Group UK Ltd | Information & communication | 2025 |
| Learngility Ltd | Professional & scientific | 2021 |
| Leasing UK Limited | Administrative & support | 2004 |
| Leasingworld Limited | Administrative & support | 2005 |
| Lectrol Limited | Administrative & support | 2010 |
| Ledauto UK Ltd | Wholesale & retail | 2023 |
| LEE Edwards Racing Ltd | Agriculture & fishing | 2025 |
| LEE Huxley Developments Limited | Construction | 2019 |
| LEE M Davis Ltd | Construction | 2018 |
| Leech & Co GAS Services Ltd | Construction | 2025 |
| Left 'N Write Limited | Wholesale & retail | 2003 |
| Legacy LEA Company Limited | Professional & scientific | 2016 |
| Legacy Leisure Limited | Arts & recreation | 2013 |
| Legacy Resources Ltd | Other services | 2025 |
| Legbar Limited | Hospitality | 2026 |
| Lehane Analytics Ltd | Administrative & support | 2025 |
| Leigh Sinton Garden Machinery Limited | Manufacturing | 2015 |
| Leigh Sinton Storage Limited | Real estate | 2022 |
| Leighton Camera Action Ltd | Information & communication | 2025 |
| Leisure Doctors Consultancy Limited | Arts & recreation | 2007 |
| Leland Holdings Ltd | Real estate | 2024 |
| Lema Project and Design Management Ltd | Professional & scientific | 2000 |
| Lennon Housing Ltd | Real estate | 2021 |
| Lenret Financial Investments Limited | Real estate | 1954 |
| Leo's Lodge Ltd | Hospitality | 2025 |
| Leon James Limited | Professional & scientific | 2006 |
| LES Smith Bulk Haulage Limited | Transport & logistics | 2017 |