| Lawrance Pallets Ltd | Wholesale & retail | 2019 |
| Lawrence Foote & Partners (London) Limited | Professional & scientific | 2006 |
| Lawrence Foote & Partners Limited | Construction | 1999 |
| Lawrence Foote (London) Ltd | Extraterritorial | 2009 |
| Lawrence Foote Ltd | Extraterritorial | 2009 |
| Lawsat Limited | Professional & scientific | 2004 |
| Lawsat Pharm Ltd | Wholesale & retail | 2013 |
| Lawton G. Douglas Limited | Financial services | 2020 |
| Laxmipur Properties Ltd | Real estate | 2024 |
| Layer 1 Retouching Limited | Professional & scientific | 2006 |
| Lazare Hoche Europe Ltd | Professional & scientific | 2017 |
| Lazy FOX Games Ltd | Information & communication | 2026 |
| Lazy Leopard Ltd | Wholesale & retail | 2025 |
| LB Fire & Security Ltd | Construction | 2026 |
| LB QP Consultancy Limited | Professional & scientific | 2025 |
| LB63 Promotions Limited | Arts & recreation | 2025 |
| LBC Leisure Limited | Hospitality | 2015 |
| Lbdh Limited | Health & social care | 2026 |
| LBL Partners Ltd | Information & communication | 2024 |
| Lcmg Property Limited | Real estate | 2020 |
| LCN Landscaping Limited | Construction | 2020 |
| LDF Limited | Construction | 2019 |
| LDH Limited | Financial services | 2024 |
| LDN Media Ltd | Information & communication | 2024 |
| Ldsk Building Ltd | Construction | 2017 |
| LE Care Solution Ltd | Professional & scientific | 2016 |
| LE Grove Solar Limited | Construction | 2011 |
| LE Holdings Limited | Financial services | 2021 |
| LE Property Wealth Limited | Real estate | 2018 |
| Leach Family Holdings Limited | Financial services | 2024 |
| Leach Investments Limited | Real estate | 2012 |
| Lead Growth Management Ltd | Information & communication | 2025 |
| Leadership Transformed Ltd | Professional & scientific | 2016 |
| Leadfire Digital Limited | Professional & scientific | 2026 |
| Leading Corporation Limited | Households | 1989 |
| Leading With Possibility Ltd | Professional & scientific | 2026 |
| Leah Flavell Consultancy Ltd | Professional & scientific | 2015 |
| Leal's Plumbing & Heating Services Limited | Construction | 2015 |
| Lean Fitness Limited | Arts & recreation | 2020 |
| Leaneric Limited | Information & communication | 2020 |
| Leap Frog Associates Limited | Professional & scientific | 2003 |
| Learnatrade Limited | Information & communication | 2001 |
| Leasemid Residents Management Limited | Households | 1988 |
| Lebor Trading Limited | Wholesale & retail | 2019 |
| LED Screen Hire Events Limited | Administrative & support | 2010 |
| Ledevate Limited | Extraterritorial | 2025 |
| Ledgify Accounting Limited | Professional & scientific | 2023 |
| LEE Castle Holdings Limited | Financial services | 2024 |
| LEE Cooling Ltd | Energy | 2022 |
| LEE Engineering Services Ltd | Manufacturing | 2019 |
| Leeroy Ltd | Financial services | 2023 |
| Left Right Ltd | Information & communication | 2025 |
| Legacy Roofing and Home Maintenance Ltd | Construction | 2025 |
| Legal 230 Limited | Professional & scientific | 2021 |
| Legal-Link Limited | Real estate | 1995 |
| Legendearly Limited | Extraterritorial | 1987 |
| Leilin Design Ltd | Manufacturing | 2017 |
| Leisure Centr Limited | Wholesale & retail | 2024 |
| Leithen Ventures Ltd | Professional & scientific | 2022 |
| Lelila Rosa UK Limited | Real estate | 2011 |
| Lelliotts Sunblinds Limited | Wholesale & retail | 1966 |
| Lemo (U.K.) Limited | Manufacturing | 1972 |
| Lemon Squeeze Limited | Information & communication | 2010 |
| Lemonade Print Group Limited | Manufacturing | 2018 |
| Lena Homes Limited | Construction | 2022 |
| LEND2B Limited | Other services | 2023 |
| Lenis Consultancy Ltd | Professional & scientific | 2026 |
| Lenis Pharmaceutical UK Limited | Professional & scientific | 2026 |
| Lenvi Limited | Financial services | 2022 |
| Lenvi Servicing Limited | Financial services | 2008 |
| LEO Transporti Ltd | Transport & logistics | 2017 |
| Leon Solar Leap Limited | Construction | 2025 |
| Leonardslee Illuminated Ltd | Arts & recreation | 2019 |
| Leonardslee Lights Ltd | Arts & recreation | 2024 |
| Leopard Bidco Limited | Financial services | 2024 |
| Leopard Hotels Limited | Real estate | 2007 |
| LES Orangers Developments Limited | Real estate | 2014 |
| LES Plaisirs DE France Ltd | Wholesale & retail | 2016 |
| LES Producteurs ET Vignerons DE France Limited | Wholesale & retail | 1984 |
| LES Russell Plumbing & Heating Ltd | Construction | 2020 |
| Lesada Properties Limited | Construction | 2005 |
| Lethal Auto Design Ltd | Manufacturing | 2002 |
| Letthegoodtimesroll Limited | Real estate | 1969 |
| Letts Homes & Co Ltd | Households | 2023 |
| Level 1 Worthing Limited | Wholesale & retail | 2021 |
| Level UP Autos Ltd | Wholesale & retail | 2026 |
| Level-D Consulting Ltd | Professional & scientific | 2014 |
| Levelfeature Property Management Limited | Households | 1987 |
| Levering Ltd | Professional & scientific | 2003 |
| Leverton Property Management Limited | Real estate | 2013 |
| Levlr Limited | Information & communication | 2024 |
| Levy Right Ltd | Professional & scientific | 2023 |
| Lewes Music Group CIC | Arts & recreation | 2023 |
| Lewes Project Management Services Ltd | Construction | 2020 |
| Lewin Builders Ltd | Construction | 2017 |
| Lewington's Financial Services Limited | Professional & scientific | 2022 |
| Lezenes & Partners Limited | Professional & scientific | 2002 |
| LFP (London) Ltd | Construction | 2009 |
| LFP (Sussex) Ltd | Extraterritorial | 2009 |
| LG Commerce Ltd | Professional & scientific | 2024 |