| LOAD2GO Limited | Transport & logistics | 2019 |
| Loaf Training Limited | Education | 2013 |
| Lobbery Limited | Financial services | 2021 |
| Lobo Security K9 Ltd | Manufacturing | 2018 |
| Local Motors Ltd | Wholesale & retail | 2012 |
| Local Music Limited | Information & communication | 2024 |
| Loch & Quay Lettings Ltd | Real estate | 2022 |
| Lock and Flow Plumbing and Heating Ltd | Construction | 2025 |
| Lockau International Ltd | Real estate | 2019 |
| Lockfit (SC) Ltd | Other services | 2025 |
| Lockhouse Games Limited | Arts & recreation | 2016 |
| Lockin Lettings Ltd | Real estate | 2024 |
| LOCKS4YOU 24-7 Ltd | Manufacturing | 2025 |
| Lockwood Cars Limited | Wholesale & retail | 2015 |
| Lockwood Clinical Ltd | Health & social care | 2026 |
| Lockwood Projects Limited | Construction | 2014 |
| Lockwoods Residential Ltd | Real estate | 2021 |
| Locomotive 6667 Limited | Administrative & support | 1998 |
| Locum Law Limited | Administrative & support | 2021 |
| Locus Group Limited | Construction | 2018 |
| Lodge Farm Fisheries Limited | Agriculture & fishing | 2001 |
| Lodge House Moorgate Ltd | Real estate | 2024 |
| Lodge Resource Management Limited | Water & waste | 2012 |
| Lofthouse Transport Ltd | Transport & logistics | 2011 |
| Logan Housing Limited | Construction | 2015 |
| Logbook.Aero Limited | Information & communication | 2021 |
| Logcomp Limited | Transport & logistics | 2016 |
| Logica Digital Ltd | Professional & scientific | 2020 |
| Logical Group Holdings Limited | Financial services | 2024 |
| Logical Plumbing Solutions Limited | Construction | 2020 |
| Logicstyle Limited | Construction | 1986 |
| Logiko Transport Ltd | Wholesale & retail | 2013 |
| Logistics INT Limited | Transport & logistics | 2025 |
| Logistix Limited | Transport & logistics | 2025 |
| Logistix Trading Limited | Wholesale & retail | 2025 |
| Logspace Ltd | Transport & logistics | 2018 |
| Lomirax Trading Ltd | Extraterritorial | 2026 |
| Londar Holdings Limited | Financial services | 2021 |
| London & Counties Metals Ltd | Wholesale & retail | 2021 |
| London & York Limited | Financial services | 1999 |
| London App Syndicate Ltd | Information & communication | 2026 |
| London Digital Services Ltd | Information & communication | 2017 |
| London EYE 1 Ltd | Wholesale & retail | 2025 |
| London Lifting Gear Limited | Professional & scientific | 2000 |
| London School of Islamic Finance Limited | Extraterritorial | 2022 |
| London Trend Limited | Wholesale & retail | 2017 |
| Long Term Property Investments Limited | Real estate | 2024 |
| Longacre Trading Ltd | Wholesale & retail | 2023 |
| Longevity Protocols Ltd | Manufacturing | 2025 |
| Longmaze Limited | Professional & scientific | 2015 |
| Longmeadow Pet Hotel Limited | Other services | 2022 |
| Longstaff Support Ltd | Construction | 2019 |
| Longwood Victoria Holding Ltd | Financial services | 2021 |
| Lonnie MOO Crafts Ltd | Wholesale & retail | 2025 |
| Lonson Engineering Limited | Administrative & support | 2012 |
| Lookthru Holdings Limited | Financial services | 2025 |
| Lookthru Limited | Information & communication | 2018 |
| Loona Education Ltd | Education | 2024 |
| Lord Business Ltd | Transport & logistics | 2019 |
| Lord Logistics Ltd | Transport & logistics | 2025 |
| Lord Porter Property Rentals Ltd | Real estate | 2025 |
| Lord ST Car Wash Ltd | Administrative & support | 2024 |
| Lori Bananas Limited | Wholesale & retail | 2024 |
| Lorian Biet Ltd | Manufacturing | 2026 |
| Lorvin 09 Ltd. | Financial services | 2009 |
| Lost Then Found Ltd | Wholesale & retail | 2026 |
| Lotan Group UK Ltd | Wholesale & retail | 2016 |
| Lotan Properties Ltd | Real estate | 2026 |
| Lotiw Limited | Manufacturing | 2021 |
| Lotted Properties Ltd | Real estate | 2024 |
| Lottie Tomlinson Limited | Other services | 2022 |
| Lotus Indian Cuisine Ltd | Hospitality | 2024 |
| Loud Crowd IT Ltd | Information & communication | 2016 |
| Louis D Wilson Ltd | Public administration | 2024 |
| Louis Nails Ltd | Other services | 2024 |
| Louis Seal TM Ltd | Public administration | 2023 |
| Louise Davies Audit & Compliance Services Ltd | Professional & scientific | 2024 |
| Louise Draper Designs Ltd | Professional & scientific | 2018 |
| Louise Hitch Marketing Limited | Administrative & support | 2012 |
| Louisianna's Limited | Hospitality | 2021 |
| Loup Blanc Ltd | Information & communication | 2026 |
| Louvina Ltd | Professional & scientific | 2020 |
| Lovailand Ltd | Construction | 2023 |
| Love 2 Vape Doncaster Ltd | Wholesale & retail | 2026 |
| Love and Light Healthcare Ltd | Health & social care | 2022 |
| Love Artists Limited | Arts & recreation | 2021 |
| Love Money Finance Ltd | Financial services | 2018 |
| Love Money Vehicles Ltd | Wholesale & retail | 2019 |
| Love N Vape Ltd | Wholesale & retail | 2020 |
| Love Nails 85 Ltd | Other services | 2023 |
| Loversall Farming LLP | | 2014 |
| Loversall Lakes Limited | Agriculture & fishing | 2017 |
| Loversall Vineyard Ltd | Agriculture & fishing | 2022 |
| LOW Drop Enterprises Ltd | Transport & logistics | 2019 |
| LOW Mileage Cars Ltd | Wholesale & retail | 2017 |
| Lowcarb Scan Ltd | Information & communication | 2023 |
| Lowfield Plumbing and Heating Ltd | Construction | 2021 |
| Lowth Limited | Construction | 2022 |
| Lowther Properties (Yorkshire) Ltd | Real estate | 2023 |
| LP Rigging Services Limited | Information & communication | 2020 |