| Lara Crafts Limited | Wholesale & retail | 2026 |
| Lara House Limited | Real estate | 2024 |
| Laraim Limited | Professional & scientific | 2002 |
| Larchbond Transport Services Limited | Information & communication | 1985 |
| Laserads Ltd | Information & communication | 2023 |
| LAT Business Services Limited | Arts & recreation | 2002 |
| Latchcity Limited | Professional & scientific | 1988 |
| Latchmain Limited | | 1984 |
| LAU and Sons Limited | Real estate | 1990 |
| Laura Ashley by Uskees Ltd | Wholesale & retail | 2026 |
| Laura Carter Consulting Limited | Professional & scientific | 2013 |
| Lavael Ltd | Wholesale & retail | 2023 |
| LAVIV2 Ltd | Health & social care | 2022 |
| Lawful Good Media Ltd | Information & communication | 2018 |
| Lawrenster Ltd | Health & social care | 2024 |
| Lawson Scott Aesthetics Ltd | Health & social care | 2019 |
| Laxmi Properties Limited | Administrative & support | 1997 |
| Layer Products Limited | Construction | 2003 |
| Lazard Property Investments Ltd | Real estate | 2020 |
| Lazaro Shopping Ltd | Wholesale & retail | 2024 |
| LB Consult Limited | Professional & scientific | 2013 |
| LB Enterprises Limited | Wholesale & retail | 1998 |
| LB Utilities Services Limited | Water & waste | 2023 |
| LBP Solutions Limited | Construction | 2005 |
| LC Technical Solutions Ltd | Construction | 2013 |
| LDN Heating Limited | Construction | 2016 |
| LE Club Hasjiesj Amsterdam Ltd | Agriculture & fishing | 2025 |
| LE Petit Ange Limited | Wholesale & retail | 2014 |
| LEA and Stort Cruises Limited | Other services | 1973 |
| LEA Valley Construction Limited | Construction | 2004 |
| Leach & Sons Contractors Limited | Construction | 2005 |
| Leading Brands Ltd | Wholesale & retail | 2023 |
| Leading Furniture Hire Limited | Administrative & support | 2026 |
| Leadmark Ltd | Wholesale & retail | 2025 |
| Leadrole Limited | Other services | 2026 |
| Leadsapi Ltd | Information & communication | 2026 |
| Leanora's Enterprise Limited | Health & social care | 2006 |
| Leap Creative Limited | Professional & scientific | 2005 |
| Learnex Ltd | Education | 2014 |
| Learnifyops Private Ltd | Information & communication | 2026 |
| Learoyds Limited | Wholesale & retail | 2005 |
| Leathermuse Ltd | Wholesale & retail | 2025 |
| Lecarda Ltd | Wholesale & retail | 2026 |
| Lecka Contract Services Ltd | Health & social care | 2023 |
| Ledgerfx Limited | Professional & scientific | 2023 |
| Ledlite Glass (Southend) Limited | Administrative & support | 1981 |
| Leeks Properties Limited | Real estate | 2006 |
| Lees Court (Glemsford ) Management Company Limited | Real estate | 2006 |
| Legacy XS | Health & social care | 2003 |
| Legacy XS Management Limited | Arts & recreation | 2004 |
| Legal Link Group Ltd | Administrative & support | 2025 |
| Legal Nexus Consultancy Ltd | Professional & scientific | 2025 |
| Leigh Launderama Ltd | Other services | 2025 |
| Leisure Shop Limited | Wholesale & retail | 2006 |
| Lemat Kitchen Ltd | Hospitality | 2024 |
| Lemongrass Kitchens Limited | Manufacturing | 2002 |
| Lena Catering Ltd | Hospitality | 2021 |
| Lennox-J Engineering Limited | Other services | 2007 |
| Lenoir Motors Ltd | Wholesale & retail | 2025 |
| Lensbury Avenue Facility Management Solutions Ltd | Construction | 2020 |
| Lenteco Limited | Professional & scientific | 2001 |
| Leogant Ltd | Wholesale & retail | 2026 |
| Leon & Coco Limited | Health & social care | 2020 |
| Leonard Gray LLP | | 2007 |
| Leonardo MW Ltd | Construction | 2003 |
| Lepra | Health & social care | 1937 |
| Leros Ventures Ltd | Wholesale & retail | 2026 |
| Lesley Meall Limited | Professional & scientific | 2003 |
| Leslie S. Bellamy Limited | Real estate | 1961 |
| LET Cleanness BE Ltd | Administrative & support | 2003 |
| Letsgoactive Limited | Professional & scientific | 2001 |
| Letways UK Ltd | Real estate | 2024 |
| Leverage Capital Mortages Ltd | Financial services | 2018 |
| Levois Limited | Wholesale & retail | 1988 |
| Lewellens Clacton Limited | Wholesale & retail | 1962 |
| LEX Mechanical Ltd | Construction | 2026 |
| Lexden Physiotherapy Limited | Health & social care | 2006 |
| Leylas DRY Cleaners Limited | Other services | 1997 |
| LHI Services Ltd | Other services | 2024 |
| Liberty C (IG11) RTM Company Limited | Households | 2024 |
| Liberty Mount Direct Limited | Information & communication | 2014 |
| Life in Christ Outreach | Education | 2003 |
| Life-Force Centre for Natural Well-Being Limited | Health & social care | 1994 |
| Lifepond Limited | Professional & scientific | 2005 |
| Light Touch Accommodation Ltd | Real estate | 2013 |
| Light Touch Technology Ltd | Information & communication | 2014 |
| Lighthouse Furniture Project Limited | Wholesale & retail | 2004 |
| Lightning Logistics Limited | Construction | 1997 |
| Lightning Property Services Ltd | Other services | 2016 |
| Lightspeed Systems (Europe) Limited | Information & communication | 2005 |
| Lilyfrank Limited | Real estate | 2006 |
| Lime Tree Court (Leigh-On-Sea) Limited | Real estate | 2003 |
| Lime Walk Management Limited | Households | 1979 |
| Limecart Ltd | Wholesale & retail | 2026 |
| Limedeal Ltd | Wholesale & retail | 2003 |
| Lincoln Court (Eastern Avenue) Management Company Limited | Real estate | 1986 |
| Lincoln House Flat Maintenance Company Limited | Households | 1984 |
| Linda Jarman Limited | Hospitality | 2006 |
| Line Cube Ltd | Wholesale & retail | 2025 |
| Linera Global Trading Ltd | Wholesale & retail | 2024 |