| Landmarks Training Enterprises Limited | Hospitality | 2016 |
| Landrake Limited | Wholesale & retail | 2021 |
| Landroid Ltd | Professional & scientific | 2020 |
| Landscape & Ecology Research Ltd | Administrative & support | 2017 |
| Landscape Enterprise Services Ltd | Administrative & support | 2000 |
| Landscape Research Office Limited | Professional & scientific | 1986 |
| Landscapes & Drives Ltd | Professional & scientific | 2026 |
| Landscapes Groundworks & Services Limited | Administrative & support | 2020 |
| Landscaping Supplies Direct Limited | Wholesale & retail | 2007 |
| Landscope Enterprises Ltd | Real estate | 2006 |
| Landships Community Interest Company | Administrative & support | 2017 |
| Landtex Limited | Water & waste | 2016 |
| Landward Research Ltd | Professional & scientific | 1999 |
| Lane Collective Ltd | Other services | 2025 |
| Lane Head Properties Ltd | Real estate | 2021 |
| Langdale Consultancy Limited | Financial services | 2015 |
| Langland Limited | Construction | 2020 |
| Langsett Hair CUT Ltd | Other services | 2021 |
| Langsett House Management Company Ltd | Households | 2012 |
| Langsett Light Engineering Ltd | Manufacturing | 2011 |
| Langsett Motors Ltd | Wholesale & retail | 2025 |
| Langwell Limited | Wholesale & retail | 2025 |
| Langwith Estates Limited | Financial services | 2026 |
| Lanik World International Ltd | Wholesale & retail | 2022 |
| Lanneth Developments Limited | Construction | 2008 |
| Lansdowne Communications Limited | Professional & scientific | 2019 |
| Lansmere Hosting Limited | Information & communication | 2025 |
| Lansoft Computer Consultants Limited | Information & communication | 1999 |
| Lantern Engineering Limited | Manufacturing | 1986 |
| Lantern Ramps Limited | Manufacturing | 1987 |
| Lantern Theatre Limited | Arts & recreation | 2012 |
| Lanterna (IT) Ltd | Information & communication | 2011 |
| Lanzarote Limited | Real estate | 2022 |
| Lapidaris UK Limited | Other services | 2019 |
| LAR Investments Limited | Financial services | 2013 |
| LAR Property & Land Limited | Wholesale & retail | 2014 |
| Larch Delivery Company Limited | Financial services | 2022 |
| Largesilva Technologies Limited | Information & communication | 2025 |
| Largo Bay Group Ltd | Professional & scientific | 2022 |
| Larisha Taverns Ltd | Hospitality | 2026 |
| Larizia Limited | Wholesale & retail | 1987 |
| Lark View Management Company Limited | Households | 2021 |
| Larking Property Ltd | Real estate | 2023 |
| Larkmist Limited | Real estate | 2008 |
| Larnill Limited | Professional & scientific | 1987 |
| Larry International Ltd | Transport & logistics | 2015 |
| Lars Andersen Ltd | Information & communication | 2024 |
| Lars LAJ UK Limited | Construction | 2011 |
| Larsen Construction Limited | Professional & scientific | 2025 |
| Lasa Home Ltd | Construction | 2021 |
| Lasc Data Networking Ltd | Construction | 2020 |
| Lasefinity Ltd | Manufacturing | 2026 |
| Laser Cutting - Ceramics Limited | Manufacturing | 2002 |
| Laser Cutting Holdings Limited | Financial services | 2024 |
| Laser Partners UK Limited | Professional & scientific | 2021 |
| Laser Scanning Limited | Professional & scientific | 2014 |
| Laser Technik Limited | Information & communication | 2014 |
| Lash Dolls UK Academy Ltd | Other services | 2019 |
| Lash Mafia Ltd | Other services | 2026 |
| Lash ME Angela Ltd | Other services | 2026 |
| Lashbrowbar Limited | Other services | 2020 |
| Lashesbyhollyd Limited | Health & social care | 2024 |
| Lashh Limited | Other services | 2015 |
| Lasita Maja UK Ltd | Wholesale & retail | 2012 |
| Lassamedical Ltd | Health & social care | 2021 |
| Last Orders Pubs Ltd | Hospitality | 2026 |
| Last Person Standing App Ltd | Information & communication | 2026 |
| Last Train Home Ltd | Information & communication | 2025 |
| Lasting-Impressions Limited | Health & social care | 2014 |
| Lastnet Limited | Information & communication | 2016 |
| Lastra Joinery Ltd | Manufacturing | 2024 |
| Latam Media Investments (UK) Ltd | Financial services | 2016 |
| Latart Trade Limited | Wholesale & retail | 2023 |
| Late Replies Ltd | Information & communication | 2026 |
| Late Shopper (Winco) Limited | Wholesale & retail | 2016 |
| Latham Davies Limited | Professional & scientific | 2003 |
| Lathams (Doncaster) Limited | Extraterritorial | 1945 |
| Lathco Manufacturing and Design Limited | Manufacturing | 2020 |
| Lathco Manufacturing Limited | Manufacturing | 2016 |
| Latheland Ltd | Manufacturing | 2018 |
| Latif a 2 Z Ltd | Transport & logistics | 2022 |
| Latimer Funding Ltd | Financial services | 2022 |
| Latimer Practice Ltd | Health & social care | 2021 |
| Latimer Space Ltd | Real estate | 2022 |
| Latimer Tuition Ltd | Education | 2021 |
| Latrovo Limited | Wholesale & retail | 2019 |
| Latte Caffe Ltd | Hospitality | 2024 |
| Latterly Ltd | Professional & scientific | 2022 |
| LAU Miguez Ltd | Professional & scientific | 2023 |
| Laudix Labs Ltd | Information & communication | 2026 |
| Laughing Beards Limited | Information & communication | 2013 |
| Laughton Farm House Ltd | Hospitality | 2025 |
| Launchpad Promotions Ltd | Wholesale & retail | 2025 |
| Laundreams Ltd | Other services | 2018 |
| Laundry Consult Limited | Professional & scientific | 2024 |
| Laundry Point + Ltd | Other services | 2024 |
| Laundry Room (Sheffield) Ltd | Other services | 2024 |
| Laundry Sheff Limited | Other services | 2023 |
| Launt Ltd | Real estate | 2023 |
| Laura's Hackenthorpe Limited | Wholesale & retail | 2014 |