| Lewis & Faulkner Limited | Wholesale & retail | 2024 |
| Lewis Mobility Limited | Wholesale & retail | 2000 |
| Lexcom Consultants Ltd | Manufacturing | 2003 |
| Lexmey Logtrans Ltd | Transport & logistics | 2025 |
| LF J Hill Ltd | Real estate | 2025 |
| LF Services Ltd | Administrative & support | 2023 |
| LFE Lifestyle Limited | Other services | 2020 |
| LG Haywards Heath Ltd | Hospitality | 2019 |
| Lhoirs Limited | Other services | 2024 |
| LHW59 Ltd | Public administration | 2020 |
| Li's Food Ltd | Hospitality | 2024 |
| Liam Hand Car Wash Ltd | Wholesale & retail | 2021 |
| Liano & Liano Ltd | Health & social care | 2024 |
| Liber Solutions Limited | Information & communication | 2021 |
| Liberi Holdings Ltd | Financial services | 2023 |
| Libertas Technical Solutions Limited | Information & communication | 2014 |
| Lidiard Management Limited | Households | 2010 |
| Lidsey Ltd | Real estate | 2019 |
| Life Couriers Radiopharma Limited | Transport & logistics | 2025 |
| Life Couriers UK Limited | Transport & logistics | 1992 |
| Life in Metro Limited | Wholesale & retail | 2025 |
| Life Premier Care Ltd | Administrative & support | 2020 |
| Lift-Equip Limited | Wholesale & retail | 2026 |
| Light on the Hill Limited | Wholesale & retail | 2023 |
| Lighthouse Dental Practice Limited | Health & social care | 2007 |
| Lili Projects Ltd. | Professional & scientific | 2016 |
| Lilley Plasterers Southern Limited | Construction | 2011 |
| Lily and Lime LD CIC | Hospitality | 2015 |
| Limburn Services Ltd | Construction | 2025 |
| Limewood Builders South Limited | Construction | 2024 |
| Limewood Group of Companies Limited | Administrative & support | 2016 |
| Limited Only by Imagination Ltd | Construction | 2018 |
| Limitless Vehicles Limited | Wholesale & retail | 2025 |
| Linfield Printers Limited | Manufacturing | 2016 |
| Lingfield Court (Portsmouth) Limited | Hospitality | 1981 |
| Linguistica Recruitment Limited | Administrative & support | 2016 |
| Link Care Services Ltd | Health & social care | 2017 |
| Linked Living Limited | Real estate | 2019 |
| Linkhorn Plumbing and Heating Limited | Construction | 2009 |
| Linsfort Capital Limited | Other services | 2024 |
| Linsfort Limited | Real estate | 2013 |
| Linsfort Sandylands Ltd | Real estate | 2020 |
| LIO Properties Limited | Real estate | 2024 |
| Liquid Courage & Co Limited | Hospitality | 2025 |
| Liquid Friday Group Limited | Professional & scientific | 2024 |
| Liquid Friday Limited | Administrative & support | 2006 |
| Liquid Friday Umbrella Limited | Extraterritorial | 2021 |
| Liquid Link Limited | Financial services | 2018 |
| Liquid Sunshine Ltd | Information & communication | 2019 |
| Lisa MAC Limited | Health & social care | 2017 |
| Lispenard Ltd | Real estate | 2012 |
| Liss Youth Centre Limited | Health & social care | 2005 |
| Lite Work Communications Limited | Information & communication | 2025 |
| Lithella Limited | Construction | 2022 |
| Little Bird INV Ltd | Real estate | 2015 |
| Little Bird Productions Limited | Arts & recreation | 2015 |
| Little Deer Limited | Wholesale & retail | 2017 |
| Little Fire Forge Ironworks Ltd | Manufacturing | 2024 |
| Little Kanga Ltd | Professional & scientific | 2016 |
| Little Norton Mill Ltd | Hospitality | 2018 |
| Little Thinkers Pre-School & Nursery | Education | 2003 |
| Liugong Machinery (UK) Limited | Manufacturing | 2009 |
| LIV Mann Ltd | Transport & logistics | 2018 |
| Livat Academy UK Ltd | Education | 2023 |
| Live Alive Limited | Administrative & support | 2023 |
| Live Town Limited | Information & communication | 2023 |
| Liverport Limited | Health & social care | 2015 |
| Livingrooms Home Improvements Ltd | Construction | 2011 |
| Lizard Events Limited | Information & communication | 2014 |
| Ljeg Ltd | Real estate | 2025 |
| LJS Waste Ltd | Water & waste | 2020 |
| LKD Consultancy South Ltd | Extraterritorial | 2014 |
| LL Waste Recycling Ltd | Administrative & support | 2015 |
| LLC23 Limited | Information & communication | 2022 |
| Llgroves Consultancy Limited | Other services | 2019 |
| Lljh Ltd | Professional & scientific | 2023 |
| Llmc Limited | Professional & scientific | 2006 |
| Lloyd International Transport Ltd | Transport & logistics | 2025 |
| LM Roofing Specialist Ltd | Construction | 2022 |
| LM Singh Foods Limited | Hospitality | 2025 |
| LMC Field Services Ltd | Professional & scientific | 2026 |
| LMD Management Services Limited | Real estate | 2016 |
| LMD Property Investments Ltd | Real estate | 2020 |
| LME Energy Ltd | Construction | 2024 |
| Loadbalancer.Org Limited | Information & communication | 2003 |
| Lobi Ltd | Construction | 2020 |
| Local Binder Ltd | Wholesale & retail | 2026 |
| Local Surveyors Direct Holdings Limited | Financial services | 2020 |
| Local Trader Connect Ltd | Professional & scientific | 2026 |
| Locallinked Ltd | Information & communication | 2023 |
| Location Key Property Limited | Real estate | 2020 |
| Loch and Quay Developments Limited | Real estate | 2020 |
| Loch and Quay Management Limited | Real estate | 2021 |
| Locksheath Fish and Chips Ltd | Hospitality | 2025 |
| Loco OM SAI Limited | Wholesale & retail | 2014 |
| Loft Guard Insulation Limited | Construction | 2025 |
| Loliter Travels Ltd | Administrative & support | 2025 |
| Lombard Court Residents Association Limited | Hospitality | 1992 |
| London Avenue Garage Limited | Wholesale & retail | 2013 |
| London Bridge DRY Wall Limited | Professional & scientific | 2013 |