| Labour Property Ltd | Real estate | 2017 |
| Labuma Ltd | Transport & logistics | 2019 |
| Ladder and Mountain Ltd | Wholesale & retail | 2012 |
| Ladele Ltd | Real estate | 2022 |
| Lads & Dads Barber Shop Ltd | Other services | 2015 |
| Laerryblue Communications Limited | Professional & scientific | 2025 |
| Lagan Farms (Dorset) Limited | Agriculture & fishing | 1996 |
| Lage Consultancy Ltd | Other services | 2023 |
| Laitan Ltd | Information & communication | 2021 |
| Lake Energy Ltd | Extraterritorial | 2017 |
| Lakes Mortgages Limited | Financial services | 2013 |
| Lakeside Timber Limited | Manufacturing | 2003 |
| Lakrich Food and Drink Ltd | Manufacturing | 2019 |
| LAL Homes Limited | Real estate | 2025 |
| Lala Improvements Ltd | Construction | 2022 |
| Lambda Expressions Ltd | Professional & scientific | 2019 |
| Lambda Traveller Ltd | Information & communication | 2025 |
| Lambourn Civil Engineering Ltd | Extraterritorial | 2024 |
| Lammy Enterprise Limited | Wholesale & retail | 2024 |
| Lamplighter Properties Ltd | Households | 2025 |
| Lan-Integrated Systems Limited | Information & communication | 2018 |
| Lanber Trading Ltd | Wholesale & retail | 2019 |
| Landlord Assist Property Maintenance Limited | Construction | 2024 |
| Landshire Estates Ltd | Financial services | 2013 |
| Langdale Roofing Ltd | Construction | 2018 |
| Langham Oak Limited | Real estate | 2018 |
| Lanre Shittu Consultancy Limited | Health & social care | 2025 |
| LAP Training Ltd | Education | 2025 |
| Larry’S Accounting Ltd | Construction | 2024 |
| Lashmire Ltd | Information & communication | 2020 |
| Last British Dragon Ltd | Information & communication | 2014 |
| Last Consulting Limited | Information & communication | 2007 |
| LAT B&M Consulting Ltd | Professional & scientific | 2023 |
| Latitude Gateway Consults Ltd | Professional & scientific | 2026 |
| Latsolan Contracts UK Limited | Other services | 2015 |
| Laughing Socks Ltd | Wholesale & retail | 2023 |
| LAUNDRY48 Ltd | Other services | 2026 |
| Laura LYE Limited | Real estate | 2011 |
| Laurel Finance (Dorset) Ltd | Professional & scientific | 2026 |
| Lauren Lewis Limited | Real estate | 2001 |
| Lauren Murphy Counselling Services Limited | Health & social care | 2022 |
| Lavenda Training & Assessing Ltd | Administrative & support | 2024 |
| Lavender Cottage BNB Ltd | Hospitality | 2019 |
| Lawrence Operations Ltd | Professional & scientific | 2022 |
| Lawson Store Limited | Wholesale & retail | 2024 |
| Lawtech Group Limited | Construction | 2004 |
| Lawtech Trust | Other services | 2016 |
| LAYER2 Studio Ltd | Information & communication | 2024 |
| Lazar Buildings Ltd | Construction | 2022 |
| LBM Projects Limited | Construction | 2016 |
| LC Financial Services Limited | Financial services | 2025 |
| LCG Lift Consultancy Limited | Professional & scientific | 2008 |
| LDB Installations Ltd | Manufacturing | 2019 |
| LDF Surveying Ltd | Professional & scientific | 2021 |
| LDL Food and Wine Limited | Wholesale & retail | 2020 |
| LE Brar Law Limited | Real estate | 2024 |
| Leaf Technical Solutions Ltd | Professional & scientific | 2023 |
| Leanne Naylor Limited | Health & social care | 2021 |
| Leapfrog Change Consultancy Ltd | Professional & scientific | 2019 |
| Leapfrog Property Ltd | Real estate | 2025 |
| Lebeau Contracting Ltd | Construction | 2025 |
| Leccy.Tech Limited | Construction | 2009 |
| Ledex Limited | Manufacturing | 2012 |
| Ledextra Limited | Manufacturing | 2012 |
| LEE Denman Building Services Limited | Construction | 2026 |
| Leeds Instruments Ltd | Manufacturing | 2022 |
| Leemma Mortgages Ltd | Financial services | 2022 |
| Lees Court Estate Limited | Households | 1987 |
| Leevans Group Co., Limited | Manufacturing | 2018 |
| Leeyd (Group) Co., Limited | Professional & scientific | 2018 |
| Legacy CLO Ltd | Wholesale & retail | 2026 |
| Legacy Management Solutions Limited | Professional & scientific | 2012 |
| Legacy Oaks Ltd | Wholesale & retail | 2025 |
| Legends Enterprises Limited | Hospitality | 2000 |
| Legends Entertainments Limited | Real estate | 1991 |
| Lena Transport Services Ltd | Transport & logistics | 2018 |
| Lend a Hand Medical Care Limited | Health & social care | 2019 |
| LEO Ronaldo (UK) Hi-Tech Metals Limited | Extraterritorial | 2018 |
| Leolive Blind Systems UK Ltd | Manufacturing | 2026 |
| Lepsons Tyres Ltd | Wholesale & retail | 2009 |
| Lerici Food Ltd | Hospitality | 2024 |
| Lerruk Limited | Professional & scientific | 2017 |
| Leslie Dobson & SON Limited | Real estate | 1965 |
| LEV LUV Intergrated Services Ltd | Public administration | 2026 |
| Levers (Holdings) Limited | Extraterritorial | 2017 |
| Leverton Gardens Limited | Administrative & support | 2017 |
| Lewisham & Deptford Sewing Machines Limited | Wholesale & retail | 2014 |
| Lexington Vaughan Ltd | Administrative & support | 2009 |
| LG Decorating Contractors Limited | Construction | 2024 |
| LG Electrical Services Limited | Construction | 2004 |
| LG Ocean Limited | Hospitality | 2025 |
| LH Gillingham Limited | Hospitality | 2024 |
| LH Spinney Ltd | Agriculture & fishing | 2020 |
| LHO Consultancy Services Ltd | Professional & scientific | 2015 |
| LHO Executive Services Limited | Professional & scientific | 2015 |
| Liang & HOU Metals Corporation Limited | Extraterritorial | 2016 |
| Libbi and Ginger Bathrooms and Interiors Limited | Construction | 2025 |
| Lideer Metal Products Co., Ltd | Manufacturing | 2024 |
| Lifehea Grounds Ltd | Agriculture & fishing | 2021 |
| Lifeline Alliance Ltd | Health & social care | 2025 |