| LMC Lighthouse | Information & communication | 2023 |
| LMC Motor Group Ltd | Wholesale & retail | 2025 |
| Lmcg Consultancy Ltd | Professional & scientific | 2017 |
| LMD Welding and Fabrication Limited | Manufacturing | 2020 |
| Lmdb Digital Ltd | Information & communication | 2023 |
| LME (UK) Ltd. | Manufacturing | 2002 |
| LME (UK) Trading Group Limited | Financial services | 2026 |
| LMG (Aberdare) Limited | Health & social care | 2016 |
| Lmg-Emerge Ltd | Wholesale & retail | 2022 |
| Lmgt Ltd | Transport & logistics | 2019 |
| LMJ Properties Limited | Construction | 2012 |
| Lmkwalters Ltd | Real estate | 2019 |
| LML Lashes Ltd | Other services | 2021 |
| Lml-Made Co., Ltd | Administrative & support | 2014 |
| LMP Trans Ltd | Transport & logistics | 2019 |
| LMR Turbine Technicians Limited | Construction | 2018 |
| Lmrj Digital Ltd | Information & communication | 2025 |
| LMT Carpentry Limited | Manufacturing | 2020 |
| LMT Carpet Warehouse Ltd | Wholesale & retail | 2024 |
| LMT Co. Ltd | Administrative & support | 2017 |
| Lmts Telecoms Ltd | Information & communication | 2023 |
| Lmxo Services Limited | Professional & scientific | 2025 |
| LN Dixon Properties Ltd | Real estate | 2024 |
| LNA Haldus Ltd | Real estate | 2024 |
| LNC Electrical Services Limited | Construction | 2013 |
| Lndct Ltd | Households | 2026 |
| Lnjeml Trading Ltd | Wholesale & retail | 2025 |
| LNV Digital Systems Ltd | Information & communication | 2022 |
| LO Blessing Healthcare Services Limited | Health & social care | 2021 |
| LO Scoglio Ltd | Agriculture & fishing | 2020 |
| LO Sfizio Ltd | Wholesale & retail | 2017 |
| LOA Management Ltd | Financial services | 2025 |
| LOA Worldwide Ltd | Arts & recreation | 2019 |
| Load&Go Waste Management Ltd | Water & waste | 2019 |
| Loadedge Limited | Administrative & support | 2021 |
| Loadie Ltd | Information & communication | 2016 |
| Loadtime Logistics Ltd | Transport & logistics | 2024 |
| Loavyker Ltd | Real estate | 2025 |
| Lobanovmanagements Limited | Information & communication | 2018 |
| Lobella Tearoom Ltd | Hospitality | 2018 |
| Lobo Toboos Ltd | Wholesale & retail | 2025 |
| Lobster Digital Marketing Limited | Information & communication | 2003 |
| Lobster Lounge Limited | Hospitality | 2019 |
| Loc.Ai Ltd | Information & communication | 2025 |
| Local Appliance Rentals Birkenhead Ltd | Administrative & support | 2017 |
| Local Builder London Ltd | Construction | 2018 |
| Local Elites Ltd | Other services | 2019 |
| Local Express 94 Ltd | Wholesale & retail | 2022 |
| Local Government Data Unit - Wales | Public administration | 2000 |
| Local Knowledge Coffee Ltd | Manufacturing | 2024 |
| Local MAN With a Van & Removals Ltd | Transport & logistics | 2025 |
| Local Motive Community Interest Company | Information & communication | 2019 |
| Location Planning & Sustainable Development Ltd | Professional & scientific | 2026 |
| Location Safety Ltd | Administrative & support | 2014 |
| LOCATION2STUDIO Facilities Ltd | Administrative & support | 2022 |
| Lochaber Retail Ltd | Wholesale & retail | 2019 |
| Lochside Electrical Ltd | Manufacturing | 2019 |
| Lochurst LLP | | 2008 |
| Lock Financial Planning Services Limited | Financial services | 2025 |
| Lock Haulage Ltd | Professional & scientific | 2016 |
| Lock Management Ltd | Other services | 2025 |
| Lock Property Maintenance Ltd | Construction | 2021 |
| Lock-It Locks Ltd | Manufacturing | 2020 |
| Lockestone Investments Ltd | Real estate | 2025 |
| Locket TV and Film Transport Ltd | Administrative & support | 2013 |
| Lockett TV and Film Props Ltd | Information & communication | 2015 |
| Lockfit (Bolton) Ltd | Administrative & support | 2024 |
| Lockout Ltd | Information & communication | 2020 |
| Lockron Architectural Hardware (UK) Ltd | Wholesale & retail | 2021 |
| Locksmith Serv. Ltd | Construction | 2016 |
| Lockwick Candles Limited | Wholesale & retail | 2021 |
| Lockwire Security Limited | Information & communication | 2017 |
| Loco Consulting Limited | Administrative & support | 2020 |
| Locum Mfour Limited | Professional & scientific | 2025 |
| Locutory Limited | Hospitality | 2014 |
| Lodav Ltd | Real estate | 2015 |
| Lodebex Limited | Wholesale & retail | 2019 |
| Loder Investments Ltd | Real estate | 2024 |
| Loderi Farms Ltd | Agriculture & fishing | 2016 |
| Lodestone Consulting Engineers Limited | Professional & scientific | 2006 |
| Lodge Oncology Consulting Ltd | Health & social care | 2019 |
| Lodgeground Property Management Limited | Real estate | 2005 |
| Lodgesons Limited | Manufacturing | 1987 |
| Lodo Travel Limited | Administrative & support | 2017 |
| Loemjo OIL and GAS Limited | Professional & scientific | 2019 |
| Loewenherz | Administrative & support | 2025 |
| Loft & EXT Ltd | Construction | 2019 |
| Loft 48 Ltd | Hospitality | 2024 |
| Loft Co Service Management Ltd | Other services | 2025 |
| Loft Crafts Ltd | Wholesale & retail | 2024 |
| Loft Space Solutions Limited | Construction | 2007 |
| Loft Tech Limited | Construction | 2023 |
| Loft-Ins-Space Limited | Construction | 2020 |
| Loftaura Ltd | Wholesale & retail | 2025 |
| Lofts and Retrofits Limited | Construction | 2025 |
| Lofy Limited | Wholesale & retail | 2022 |
| Logan John Limited | Transport & logistics | 2015 |
| Logexio Ltd | Wholesale & retail | 2025 |
| Logic Heating Cooling and Plumbing Limited | Construction | 2023 |
| Logic Maintenance Services Ltd | Households | 2020 |