| Langbourn (Developments) Limited | Real estate | 1997 |
| Langbourn (Nylon) Limited | Real estate | 2014 |
| Langbourn Holdings Limited | Financial services | 2023 |
| Langbourn Properties (45SS) Limited | Real estate | 2010 |
| Langbourn Properties (47SS) Limited | Real estate | 2010 |
| Langbourn Properties (Butler's Wharf Building) Limited | Real estate | 2001 |
| Langbourn Properties (Butler's Wharf) Limited | Professional & scientific | 2000 |
| Langbourn Properties (Cardamom) Limited | Real estate | 1993 |
| Langbourn Properties (F32SCW) Limited | Real estate | 2012 |
| Langbourn Properties (FH30SCW) Limited | Real estate | 2012 |
| Langbourn Properties (FH32SCW) Limited | Real estate | 2012 |
| Langbourn Properties (FH4547SS) Limited | Real estate | 2012 |
| Langbourn Properties (G30SCW) Limited | Real estate | 2010 |
| Langbourn Properties (G32SCW) Limited | Real estate | 2010 |
| Langbourn Properties (HL32SCW) Limited | Real estate | 2010 |
| Langbourn Properties (Spice Quay) Limited | Real estate | 2001 |
| Langbourn Properties Holdings Limited | Financial services | 2023 |
| Langbourn Properties Limited | Real estate | 1990 |
| Langdale New Homes Ltd | Construction | 2020 |
| Langdon Roofing Ltd | Construction | 2016 |
| Langford-Smith Joinery Limited | | 1986 |
| Langhurst Limited | Real estate | 2003 |
| Langley House (Woking) Limited | Households | 2018 |
| Language Education Ltd | Education | 2017 |
| Lanour Ltd | Wholesale & retail | 2025 |
| Lansbury Construction Services Limited | Construction | 2020 |
| Lansbury Estates Limited | Construction | 1961 |
| Lansdown (Marketing and Distribution) Ltd | Wholesale & retail | 2020 |
| Lansing Group Limited | Professional & scientific | 1987 |
| Lansoft Limited | Extraterritorial | 1994 |
| Lanterns Consulting Limited | Information & communication | 2017 |
| Larasoft Ltd | Information & communication | 2011 |
| Larcombe IT Consultancy Limited | Information & communication | 2017 |
| Larisa & Madalin Limited | Administrative & support | 2020 |
| Larkham Nutrition Limited | Health & social care | 2025 |
| Larks Cafe Camberley Ltd | Hospitality | 2026 |
| Larks Group of Cafes Ltd | Hospitality | 2024 |
| Lasch Limited | Agriculture & fishing | 2017 |
| Lasermark Limited | Other services | 2003 |
| Laslett Health and Wellbeing Ltd | Health & social care | 2024 |
| Last 2 Go LLP | | 2012 |
| Latino Ristorante Ltd | Hospitality | 2015 |
| Latitude Business Limited | Extraterritorial | 2022 |
| Latitude Product Co Limited | Wholesale & retail | 2024 |
| Launch AI Limited | Information & communication | 2019 |
| Lauren Holly Aesthetics Ltd | Health & social care | 2026 |
| Laurie Davison Property Limited | Real estate | 2024 |
| Lavah Limited | Professional & scientific | 2016 |
| Laverick & Wolfe Holdings Limited | Financial services | 2026 |
| Lavington Property Investments Limited | Real estate | 2019 |
| Lavish Automotive Ltd | Wholesale & retail | 2010 |
| Law Meadows Residents Management Ltd | Households | 2020 |
| Law Project Limited | Extraterritorial | 2013 |
| Lawes Professional Services Limited | Professional & scientific | 2021 |
| Lawfem Ventures Limited | Wholesale & retail | 2026 |
| LAX Investments Limited | Real estate | 2005 |
| Laxton Food Safety Ltd | Professional & scientific | 2022 |
| Laycraft Ltd | Health & social care | 2005 |
| LB Construction Ltd | Construction | 2020 |
| LBA Vanguard Holdings Ltd | Financial services | 2025 |
| LBR Strathmore Hotel Co Limited | Hospitality | 2017 |
| LCL Roofing Limited | Construction | 2025 |
| LCS Local Cleaning Services Ltd | Administrative & support | 2019 |
| LE BON Avocat Limited | Professional & scientific | 2017 |
| LE Draig Electrical/Property Services Limited | Construction | 2005 |
| LE Ombre Ltd | Information & communication | 2015 |
| LE Papillon Cakes Limited | Manufacturing | 2010 |
| Lea's Cleaning Services Limited | Administrative & support | 2005 |
| Leadaline Ltd | Information & communication | 2026 |
| Leaders of Tomorrow Foundation | | 2001 |
| Leading Edge IT Consulting Ltd | Information & communication | 2022 |
| Leaf & Life Ltd | Wholesale & retail | 2020 |
| Leafy Ladies @ the Oaks Limited | Households | 2024 |
| Leak Detection 24/7 Ltd | Construction | 2021 |
| Lean Tactics Consulting Ltd | Professional & scientific | 2025 |
| Learn Automatic Limited | Information & communication | 2021 |
| Learning Partners Church Academy Trust | Education | 2013 |
| Lease Wise Consulting Ltd | Professional & scientific | 2025 |
| Leasing Solutions (U.K.), Ltd. | Financial services | 1985 |
| Leather Doctor Ltd | Manufacturing | 2012 |
| Lebenk Limited | Professional & scientific | 2022 |
| Ledda Electrical Contractors Ltd | Construction | 2017 |
| Ledtherebelight Limited | Wholesale & retail | 2009 |
| Leen Gate Industrial & Welding Supplies (Scotland) Limited | Extraterritorial | 1998 |
| Leengate Industrial & Welding Supplies (North East) Ltd | Professional & scientific | 1997 |
| Leengate Industrial & Welding Supplies Ltd | Extraterritorial | 1989 |
| Left Turn Solutions Ltd | Information & communication | 2013 |
| Legacy Software Group Ltd | Information & communication | 2024 |
| Legacy Vault Pro Limited | Administrative & support | 2026 |
| Legal Multi Media Services Ltd | Information & communication | 2025 |
| Legend Barber 1 Ltd | Other services | 2022 |
| Legitant Limited | Professional & scientific | 2026 |
| Leigh Place Properties Limited | Construction | 1984 |
| Leighton Buzzard Self Storage Limited | Transport & logistics | 2005 |
| Lektropacks Limited | Administrative & support | 2002 |
| Lema Capital Ltd | Financial services | 2026 |
| Lencrest Homes Limited | Construction | 1988 |
| Lensino Ltd | Information & communication | 2017 |
| LEO Architecture Ltd | Professional & scientific | 2019 |
| LEO Mobile Barber Ltd | Other services | 2020 |