| L.C.S Rigging Limited | Information & communication | 2014 |
| L.D Blade Repair Ltd | Manufacturing | 2022 |
| L.E.R Engineering Ltd | Professional & scientific | 2022 |
| L.H Developments 2026 Ltd | Real estate | 2026 |
| L.M Tugbiyele Ltd | Professional & scientific | 2015 |
| L.M. Jones Building and Investments Limited | Construction | 2017 |
| L.P Cladding Limited | Construction | 2015 |
| L.P Electrical 17 Ltd | Manufacturing | 2017 |
| L1ENGINE Ltd | Information & communication | 2025 |
| LA Bonita Boutique Limited | Wholesale & retail | 2015 |
| LA Grande Bouffe Limited | Hospitality | 2007 |
| LA Home Energy Services Ltd | Professional & scientific | 2023 |
| LA Rosa Pizza Ltd | Hospitality | 2023 |
| LA Vida Travel Cardiff Ltd | Administrative & support | 2019 |
| LA Vida Travel Limited | Administrative & support | 2013 |
| Label Exchange Ltd | Wholesale & retail | 2026 |
| Labelfold Limited | Manufacturing | 1994 |
| Labz Cleaning Services Ltd | Administrative & support | 2026 |
| LAC1 Consultancy Ltd | Professional & scientific | 2017 |
| Lace Utilities Ltd | Energy | 2025 |
| Lacolian Ltd | Professional & scientific | 2019 |
| Ladsa (Homes) Limited | Construction | 1982 |
| Ladz Dadz Limited | Other services | 2025 |
| LAF Software Solutions Ltd | Information & communication | 2014 |
| LAH Skincare & Aesthetics Ltd | Other services | 2024 |
| Laidlaw (2010) Holdings Limited | Extraterritorial | 2010 |
| Laidlaw (2010) Limited | Administrative & support | 2010 |
| Lakshmith Properties Limited | Real estate | 2025 |
| Laky Ltd | Real estate | 2024 |
| Lalido Ltd | Construction | 2024 |
| Lamella Structures Limited | Manufacturing | 2002 |
| Lance-Scapes Newport Limited | Administrative & support | 2021 |
| Land and Premises (U.K.) Ltd | Construction | 2003 |
| Lander & MAY Limited | Arts & recreation | 2021 |
| Landlords Like ME Ltd | Real estate | 2018 |
| Landrec CMS Ltd | Professional & scientific | 2013 |
| Landsbrook Ltd | Extraterritorial | 2014 |
| Landscaping Survival Limited | Information & communication | 2017 |
| Lane & Co Limited | Real estate | 2007 |
| Lane Co Holdings Limited | Financial services | 2021 |
| Lane END Farm Barns Management Company Limited | Households | 1989 |
| Lane Property Holdings Limited | Real estate | 2020 |
| Langham Financial Management Limited | Financial services | 1999 |
| Langley Court (IW) Management Company Limited | Households | 2019 |
| Langstone Accountants Ltd | Professional & scientific | 2024 |
| Langstone Legal Services Limited | Professional & scientific | 2017 |
| Langstrath Audio Limited | Manufacturing | 2024 |
| Langton Court (Csniow) Management Company Limited | Households | 2004 |
| Langton Court Newport Management Company Ltd | Households | 2021 |
| Lanji Interactive Training Solutions Limited | Administrative & support | 2017 |
| Lano Landi Limited | Other services | 2015 |
| Laraib PVT Ltd | Hospitality | 2015 |
| Laraya's Ltd | Arts & recreation | 2025 |
| Laraz Services Limited | Professional & scientific | 2014 |
| Larboratree Limited | Professional & scientific | 2024 |
| Larchwood Consulting Limited | Professional & scientific | 2013 |
| Larcombe Property Development Ltd | Construction | 2026 |
| Larksmere Services Limited | Construction | 2002 |
| Laser Clinic South Wales Limited | Other services | 2018 |
| Laser Direct Ltd | Manufacturing | 2022 |
| Lash Luxe (South Wales) Limited | Wholesale & retail | 2025 |
| Lashed by Chelsea Ltd | Other services | 2025 |
| Lashes by Katie Ltd | Other services | 2025 |
| Lashesbysr Ltd | Wholesale & retail | 2025 |
| Lashhayley Ltd | Other services | 2025 |
| Lashhjb Ltd | Wholesale & retail | 2025 |
| Lashilicious Ltd | Other services | 2025 |
| Lashinate Ltd | Wholesale & retail | 2025 |
| Lask 2017 Limited | Real estate | 2017 |
| Latchico Films Limited | Information & communication | 2021 |
| Latest Fashion Ltd | Wholesale & retail | 2025 |
| Latif & Sons (Isle of Wight) Limited | Real estate | 2024 |
| Latif Builders Ltd | Construction | 2026 |
| Launcelot Advisory Limited | Professional & scientific | 2025 |
| Launch PAD IW Ltd | Financial services | 2019 |
| Laundry Trostery Street Ltd | Hospitality | 2019 |
| Laura Ellis Ltd | Wholesale & retail | 2025 |
| Laura MAY Holdings Limited | Financial services | 2026 |
| Laura White Cleaning Ltd | Administrative & support | 2025 |
| Lauran Hibberd Limited | Arts & recreation | 2021 |
| Laurel House (Isle of Wight) Management Company Limited | Households | 1992 |
| Lavar Spirits Ltd | Wholesale & retail | 2025 |
| Lavender Property Limited | Real estate | 2021 |
| Law Homes Ltd | Real estate | 2011 |
| Law Logistics and Haulage Ltd | Transport & logistics | 2017 |
| Lawkin Yausum Limited | Wholesale & retail | 2023 |
| Lawn Terrace 1977 Limited | Extraterritorial | 2014 |
| Lawrence Hill Developments Limited | Construction | 2014 |
| Lawrence Lynch Developments Limited | Construction | 2021 |
| Lawrencehallett.Com Limited | Information & communication | 2006 |
| Lawyers 4 Commerce Ltd | Professional & scientific | 2010 |
| Laxmi Siri Ltd | Other services | 2013 |
| Layer Marketing Limited | Professional & scientific | 2025 |
| Layline Financial Ltd | Financial services | 2022 |
| LB Accounts & Bookkeeping Limited | Professional & scientific | 2024 |
| LB Substation Solutions Limited | Construction | 2023 |
| LC Childcare Limited | Health & social care | 2021 |
| LC Fish Bar Ltd | Real estate | 2026 |
| LC Fish Bar Trading Ltd | Hospitality | 2026 |
| LC Programme Management Limited | Professional & scientific | 2016 |