| L J Y Holdings Ltd | Financial services | 2023 |
| L M Property Services (Southern) Ltd | Construction | 2022 |
| L&J Roofing & Construction Ltd | Construction | 2025 |
| L&R Electrical and Maintenance Ltd | Manufacturing | 2024 |
| L&S Luxury Stays Ltd | Hospitality | 2024 |
| L'Amour Consultancy Ltd | Professional & scientific | 2016 |
| L. L. Blumire Ltd | Information & communication | 2024 |
| L.H. Building (Dorset) Ltd | Construction | 2020 |
| L.O.S Antenna Ltd | Information & communication | 2013 |
| L.R Pender Developments Limited | Construction | 2019 |
| L.W.S.Estates Limited | Real estate | 2022 |
| L8 Inc RTM Company Ltd | Households | 2018 |
| LA Aesthetics Ltd | Other services | 2026 |
| LA Bella Casa Limited | Administrative & support | 2009 |
| LA Bottega (N.I.) Ltd | Wholesale & retail | 2021 |
| LA Cares Services Limited | Transport & logistics | 2025 |
| LA Corniche Limited | Professional & scientific | 1990 |
| LA Dera Boutique Ltd | Wholesale & retail | 2025 |
| LA Inversion Holdings Ltd | Financial services | 2026 |
| LA Inversion Ltd | Real estate | 2024 |
| LA Islands Limited | Professional & scientific | 2024 |
| LA Islands Properties Limited | Real estate | 2016 |
| LA Law 139 Limited | Extraterritorial | 1988 |
| LA Legal Services (Basingstoke) Limited | Professional & scientific | 2017 |
| LA Lupa Ristorante Ltd | Hospitality | 2022 |
| LA Nails Studio Ltd | Other services | 2019 |
| LA Red Ltd | Information & communication | 2023 |
| La-Mia's Restaurant Limited | Hospitality | 2024 |
| LAB Partnership Limited | Other services | 2017 |
| Labcal Limited | Administrative & support | 1998 |
| Labnes Ltd | Hospitality | 2024 |
| Lachlander Limited | Wholesale & retail | 2018 |
| Lacn BR Limited | Wholesale & retail | 2025 |
| Lady Penelope Properties Ltd | Real estate | 2019 |
| Ladybirds Playschool Limited | Education | 2012 |
| Lafisto Limited | Wholesale & retail | 2025 |
| Lagoon Estates Limited | Real estate | 2009 |
| Lagoon Ltd | Information & communication | 2017 |
| Laguna Travel Limited | Administrative & support | 2019 |
| Laik Designs Ltd | Professional & scientific | 2017 |
| Laila Safaee Consultancy Ltd | Professional & scientific | 2015 |
| Lairdpage Ltd | Professional & scientific | 2020 |
| Lake Drive Enterprises Ltd | Information & communication | 2013 |
| Lake Yard Members Limited | Arts & recreation | 2001 |
| Lakeside Residential Home Ltd | Health & social care | 2024 |
| Lakeside Shellfish Limited | Extraterritorial | 2002 |
| Lakewood Construction UK Limited | Construction | 2003 |
| Lambe Enterprises Limited | Wholesale & retail | 2024 |
| Lamco Design Limited | Administrative & support | 2003 |
| Lamont Group Limited | Health & social care | 2015 |
| Lamoona Media Ltd | Information & communication | 2021 |
| Lampard Limited | Administrative & support | 2007 |
| Lamtrad Ltd | Wholesale & retail | 2012 |
| LAN Real Estate Holdings Ltd | Real estate | 2024 |
| LAN Services Limited | Construction | 2000 |
| Lancashire Waste & Demolition Ltd | Water & waste | 2025 |
| Lancaster Moor Management Company (2) Limited | Households | 2014 |
| Lancers Welding Limited | Manufacturing | 2022 |
| Land and Marine Products Limited | Manufacturing | 1984 |
| Land of Glow Ltd | Real estate | 2025 |
| Landlord Studio UK Limited | Information & communication | 2025 |
| Landmark Building and Roofing Ltd | Construction | 2026 |
| Landmark Creative Studios Limited | Professional & scientific | 2015 |
| Landsbery Software Services Ltd | Information & communication | 2021 |
| Landshore Properties Limited | Construction | 2025 |
| Lane, Jefferies & Associates Limited | Administrative & support | 2007 |
| Langdon Road (Management Company) Limited | Households | 2024 |
| Langham Advisory Services Ltd | Professional & scientific | 2026 |
| Langley Hall Gardens Limited | Households | 1998 |
| Langstone Roofing Ltd | Construction | 2021 |
| Language Hobo Ltd | Manufacturing | 2024 |
| Language Learners Hub Ltd | Education | 2025 |
| Lanh Properties Ltd | Real estate | 2023 |
| Lankos LAB Ltd | Manufacturing | 2024 |
| Lans Holdings Ltd | Professional & scientific | 2018 |
| Lanzarote First Limited | Administrative & support | 1988 |
| LAO Financial Services Ltd | Financial services | 2021 |
| LAP Decoration Limited | Extraterritorial | 2018 |
| LAP Property Services Limited | Manufacturing | 2010 |
| Lapwing Technology Ltd | Professional & scientific | 2017 |
| Larchcroft Investments Limited | Real estate | 2013 |
| Largely Creative Limited | Information & communication | 2010 |
| Larkfield Caravan Park Limited | Hospitality | 1997 |
| Larksmead Management Company Limited | Households | 2026 |
| Larmonde Ltd | Professional & scientific | 2007 |
| Larry AO Holdings Ltd | Financial services | 2021 |
| Lars & Crew Limited | Wholesale & retail | 2024 |
| Laryn Consulting Ltd | Administrative & support | 2024 |
| Lasagna Ltd | Professional & scientific | 2019 |
| Lasandra London Ltd | Wholesale & retail | 2020 |
| Lascelles Court (Bournemouth) Maintenance Company Limited | Households | 1962 |
| Laser Crystal Limited | Manufacturing | 2000 |
| Laser Crystalisation Ltd | Wholesale & retail | 2007 |
| Laser Skin Therapy Dorset Limited | Health & social care | 2025 |
| Lasercards Limited | Wholesale & retail | 2017 |
| Laserguys Limited | Arts & recreation | 2017 |
| Lasocki Consulting Ltd | Professional & scientific | 2025 |
| Latchmoor Properties Limited | Real estate | 2016 |
| Late Logistics Ltd | Transport & logistics | 2025 |
| Latham Metropolitan Limited | Real estate | 2016 |