| LIP Cheat Clinic Ltd | Other services | 2026 |
| Liquid Lunches Ltd | Wholesale & retail | 2023 |
| Lister Engineering and Fabrication Limited | Manufacturing | 2013 |
| Litaliano Lounge Bar Limited | Hospitality | 2022 |
| LITIG8 Ltd | Professional & scientific | 2024 |
| Little Dickie Birds Ltd | Arts & recreation | 2023 |
| Little Explorers Tiney Home Ltd | Health & social care | 2025 |
| Little H Limited | Transport & logistics | 2024 |
| Little India (Barnsley) Limited | Hospitality | 2025 |
| Little M'S Limited | Administrative & support | 2008 |
| Little MAN Productions Limited | Manufacturing | 2002 |
| Little Prims Boutique Limited | Wholesale & retail | 2021 |
| Little Roos Private Nursery Ltd | Education | 2023 |
| Littlewood Wealth Management Limited | Financial services | 2026 |
| Littlewoods Joinery Limited | Construction | 2007 |
| Liv's Coaching and Fitness Limited | Other services | 2025 |
| Living Forever Memories Ltd | Manufacturing | 2025 |
| Living Hope Community Mentors C.I.C. | Health & social care | 2020 |
| Livingstones Photography Ltd | Professional & scientific | 2025 |
| LIZ Green Media and Corporate Communications Limited | Other services | 2006 |
| Lizmwi Ltd | Health & social care | 2015 |
| LJ Accounts Ltd | Professional & scientific | 2015 |
| LJ Couriers Ltd | Transport & logistics | 2020 |
| LJ Haulage Ltd | Transport & logistics | 2025 |
| LJ Joyce Property Ltd | Real estate | 2024 |
| LJ Masters Limited | Real estate | 2019 |
| LJC Flooring Ltd | Construction | 2026 |
| LJF Distribution Ltd | Wholesale & retail | 2023 |
| LJS Time to Shine Cleaning Services Ltd | Administrative & support | 2025 |
| Ljsl Estates Limited | Real estate | 2026 |
| LJT Hold Ltd | Real estate | 2025 |
| LK Roofing & Building Limited | Construction | 2026 |
| LL Installations Limited | Construction | 2014 |
| LL Property Developments Limited | Construction | 2026 |
| LLI Property Management Ltd | Real estate | 2025 |
| LM Homes (Yorkshire) Limited | Construction | 2023 |
| LM Mortgages Ltd | Financial services | 2020 |
| LM23 Limited | Real estate | 2024 |
| Lmarc Ltd | Real estate | 2024 |
| LMC Doncaster Limited | Wholesale & retail | 2019 |
| LMO Costing Limited | Professional & scientific | 2015 |
| LNB Beauty Ltd | Other services | 2024 |
| LNS Turbo UK Ltd | Manufacturing | 1998 |
| LOB Group Ltd | Real estate | 2025 |
| Local Mencap Barnsley | Administrative & support | 2017 |
| Locations Support UK Limited | Administrative & support | 2025 |
| Locc Property Developments & Rentals Ltd | Real estate | 2024 |
| Lochbuie Court RTM Company Ltd | Real estate | 2013 |
| Lock Lund Investments Ltd | Real estate | 2021 |
| Lock the Doors Theatre Company Ltd | Arts & recreation | 2018 |
| Locks & Security Hardware Ltd | Wholesale & retail | 2026 |
| Locks and Handles Ltd | Wholesale & retail | 2025 |
| Locksmith Journal Ltd | Information & communication | 2009 |
| Lockswin Ltd | Other services | 2022 |
| Lockwood Heating & Bathrooms Ltd | Construction | 2016 |
| Lockwood Inns Limited | Hospitality | 2009 |
| Lockwood Property Portfolio Ltd | Real estate | 2014 |
| Lodhi & Sons Limited | Wholesale & retail | 2014 |
| Logic Window Systems Ltd | Manufacturing | 2006 |
| Logical Control Solutions Limited | Professional & scientific | 2002 |
| Logik Controls Ltd | Construction | 2020 |
| Lojix Limited | Information & communication | 2003 |
| Lola Care Ltd | Health & social care | 2018 |
| Lomafu Direct Taxis Services Ltd | Transport & logistics | 2021 |
| Lombard Close Limited | Real estate | 2023 |
| London Blackstone Developments Limited | Construction | 2018 |
| London Knightsbridge Cosmetic Clinic Limited | Other services | 2012 |
| Longden Build Limited | Construction | 2006 |
| Longsight Consulting Ltd | Professional & scientific | 2024 |
| Lorcan Weldon Events Ltd | Arts & recreation | 2023 |
| Loriad Properties Ltd | Real estate | 2026 |
| Lorian Building Contractors Limited | Construction | 2024 |
| Lost in Motion School of Dance Ltd | Arts & recreation | 2021 |
| Lotas Removals Ltd | Transport & logistics | 2016 |
| Lottminn Quality Services Limited | Construction | 2023 |
| LOU Lou's Babywear Ltd | Wholesale & retail | 2023 |
| Louise Malkinson Ltd | Information & communication | 2012 |
| Loulabelle Face Painting Ltd | Arts & recreation | 2025 |
| Lound Estates Limited | Real estate | 1986 |
| Lounge Hopper Limited | Information & communication | 2003 |
| Love & Lace Designs Ltd | Wholesale & retail | 2023 |
| Love Life (UK) Limited | Arts & recreation | 2008 |
| Love Life UK OUT Reach | Health & social care | 2011 |
| Love Lunch Ltd | Hospitality | 2013 |
| LOVE4LANGUAGES Ltd | Education | 2017 |
| Loveandcare Group Limited | Wholesale & retail | 2025 |
| Lovefoodies Ltd | Professional & scientific | 2018 |
| LOW Cost Window Company Limited | Other services | 2004 |
| LOW Valley Consultancy Ltd | Professional & scientific | 2026 |
| Lowerdale Autos Limited | Wholesale & retail | 2008 |
| Lowfield Road Dismantlers Ltd | Water & waste | 2009 |
| Lowscales Coffee Limited | Hospitality | 2023 |
| Lowthorpe Homes Limited | Real estate | 2021 |
| Loxley House Investments Limited | Real estate | 2021 |
| LP Mediskin Ltd | Health & social care | 2024 |
| LR Creations Limited | Professional & scientific | 2023 |
| LRT Security Ltd | Wholesale & retail | 2025 |
| LS Services Solutions Ltd | Construction | 2025 |
| LS Wistow Group Ltd | Real estate | 2024 |
| Ls&D Entertainment Limited | Construction | 2015 |