| LA Baraja DE Cartas Limited | Hospitality | 2023 |
| LA Cave Noire Ltd | Wholesale & retail | 2025 |
| LA Forestal Limited | Agriculture & fishing | 2002 |
| LA Senda Wines Ltd | Wholesale & retail | 2026 |
| LA Vespa Ltd | Hospitality | 2021 |
| LA Vida Hair & Beauty Limited | Other services | 2020 |
| LAB Consult Ltd | Professional & scientific | 2019 |
| Labieb Properties Ltd | Real estate | 2021 |
| Labredi Ltd | Information & communication | 2022 |
| Labu Ltd | Administrative & support | 2018 |
| Lace House Management Company (Brighton) Limited | Households | 2018 |
| Lads Lounge Grantham Ltd | Other services | 2023 |
| Lagoon Watersports Limited | Arts & recreation | 1989 |
| Laines Financial Limited | Professional & scientific | 2019 |
| Laing & Daughters Limited | Real estate | 2024 |
| Lake House Group Limited | Hospitality | 2026 |
| Lake Support Services Limited | Administrative & support | 2025 |
| Lakedale Systems Limited | Information & communication | 1992 |
| Lakeside Logistics Solutions Ltd | Administrative & support | 2021 |
| Lakeside Residence Limited | Real estate | 2016 |
| Laleden Ltd | Arts & recreation | 2020 |
| Laliya Pharmaceuticals Ltd | Wholesale & retail | 2024 |
| Lambda Partners Limited | Administrative & support | 2014 |
| Lambert House Limited | | 1967 |
| LAN Estates Limited | Real estate | 2009 |
| LAN Investment Limited | Information & communication | 2018 |
| Lanbury Associates Limited | Professional & scientific | 2004 |
| Lancaster Court Kingsway Hove Limited | Real estate | 2003 |
| Lancer Digital Ltd | Information & communication | 2011 |
| Lancing Locksmith Limited | Administrative & support | 2025 |
| Land 5 Ltd | Construction | 2023 |
| Landivar Architects Limited | Professional & scientific | 2010 |
| Landmark Kitchens Ltd | Construction | 2018 |
| Landmark Real Properties Ltd | Real estate | 2016 |
| Landseer House Company Limited | Households | 1979 |
| Landthings Ltd | Construction | 2013 |
| Lane Cove Diagnostics Limited | Health & social care | 2023 |
| Lanescraftman Ltd | Manufacturing | 2026 |
| Langbourn Partners Limited | Administrative & support | 2014 |
| Langden Consulting Limited | Administrative & support | 2024 |
| Langelees Organic Ltd | Hospitality | 2023 |
| Langfords Hotel Limited | Hospitality | 2024 |
| Langley Horticulture Limited | Agriculture & fishing | 2015 |
| Lani London Limited | Wholesale & retail | 2019 |
| Lann Estates Ltd | Financial services | 2012 |
| Lann Tech Ltd | Manufacturing | 2015 |
| Lansdowne Brickwork Limited | Construction | 2014 |
| Lansdowne Freeholders Limited | Households | 2025 |
| Lansdowne Works Ltd | Real estate | 2023 |
| Lapin Logic (UK) Ltd | Education | 2017 |
| Larch Gate Capital Ltd | Financial services | 2025 |
| Largsmount Consulting Ltd | Professional & scientific | 2013 |
| Larkspur Assets Limited | Professional & scientific | 2016 |
| Larkspur Capital Limited | Professional & scientific | 2016 |
| Larne House Holdings Ltd | Financial services | 2024 |
| Laroc Accountancy Limited | Professional & scientific | 2025 |
| Lasani Traders Ltd | Extraterritorial | 2018 |
| Last Stand Games Ltd | Information & communication | 2024 |
| Lasting Care Limited | Health & social care | 2017 |
| Lateral Consultancy Limited | Administrative & support | 2016 |
| Latinoamerica Ltd | Hospitality | 2015 |
| Latitude Sourcing Limited | Administrative & support | 2011 |
| Latpat Ltd | Administrative & support | 2017 |
| Launch Consultancy Ltd | Administrative & support | 2017 |
| Laura Brothers Ltd | Professional & scientific | 2025 |
| Laura Moran Designs Limited | Administrative & support | 2017 |
| Laura Phelan Well Limited | Education | 2019 |
| Laura Wilkes Ltd | Professional & scientific | 2021 |
| Laurel Grove Estates Limited | Households | 2005 |
| Lauren Your Mortgage Adviser Ltd | Financial services | 2025 |
| Laurence James Heating Ltd | Construction | 2018 |
| Laurence Trades Limited | Administrative & support | 2026 |
| Laurence Wholesale Ltd | Other services | 2026 |
| Lavender Lane Residents Association Limited | Households | 1990 |
| Lawfin Limited | Real estate | 1969 |
| Lawram Enterprises Limited | Professional & scientific | 1997 |
| Lawspeed Limited | Administrative & support | 1998 |
| Lawton Tech Ltd | Information & communication | 2025 |
| Layton Medical Services Limited | Health & social care | 2015 |
| Lazant Limited | Information & communication | 2018 |
| Lazulu.Tv Ltd | Information & communication | 2025 |
| Lazy FIN Ltd | Hospitality | 2017 |
| Lazy Louis Entertainment Ltd | Arts & recreation | 2013 |
| Lazzeez Ltd | Hospitality | 2021 |
| LB Construction and Renovation Limited | Construction | 2020 |
| LBK Wholesale Medical Limited | Wholesale & retail | 2017 |
| LC365 Ltd | Financial services | 2019 |
| LD Building and Roofing Ltd. | Extraterritorial | 2018 |
| LDG Fashion Ltd | Manufacturing | 2021 |
| LE Lapin 33 Ltd | Extraterritorial | 2023 |
| Lead Balloons Ltd | Wholesale & retail | 2019 |
| Lead by Example Limited | Other services | 2007 |
| Leadership NOW Ltd | Other services | 2013 |
| Leading Culture Limited | Professional & scientific | 2022 |
| Leadingtek Limited | Information & communication | 2017 |
| Leaf Healthcare Ltd | Health & social care | 2022 |
| Leanville Property Management Company Limited | Hospitality | 1992 |
| Learnerlab Limited | Information & communication | 2013 |
| Learning COG Limited | Education | 2011 |
| Lease Group Limited | Financial services | 2014 |