| KVP Last Looks Limited | Information & communication | 2022 |
| L & M Associates | | 2004 |
| L a T Ltd | Transport & logistics | 2015 |
| L Sanderson Carpentry Limited | Construction | 2014 |
| L T Illuminations Limited | Professional & scientific | 2003 |
| L&Ybesties.B.F.F Limited | Health & social care | 2020 |
| L'E Marquis Limited | Administrative & support | 2015 |
| LA VIE EN Rose Villas Limited | Hospitality | 2016 |
| Lacacao Beach 7 Limited | Construction | 2018 |
| Laconic Ltd | Professional & scientific | 2011 |
| Laconica Limited | Professional & scientific | 2015 |
| LADS2GO Properties Ltd | Real estate | 2021 |
| Lahc Construction Ltd | Manufacturing | 2023 |
| Lamps & Tubes Illuminations Limited | Other services | 2001 |
| Landmark Cars Classics Ltd | Wholesale & retail | 2007 |
| Landmark Construction Software Ltd | Information & communication | 2023 |
| Landscaping Expert Limited | Administrative & support | 2021 |
| Lanegate Limited | Real estate | 2015 |
| Langford Advisory Limited | Professional & scientific | 2026 |
| Languedoc Imports Ltd | Wholesale & retail | 2016 |
| Laplace Property Investments Limited | Real estate | 2016 |
| Larkworthy Limited | Professional & scientific | 2024 |
| Larp Costumes Limited | Extraterritorial | 2023 |
| Lars Labels Ltd | Wholesale & retail | 2020 |
| Laser Kilns Limited | Manufacturing | 1981 |
| Latcom Limited | Administrative & support | 1995 |
| Latimer Asset Management Ltd | Financial services | 2021 |
| Latimer Property Developments Limited | Manufacturing | 2005 |
| Latimer View Ltd | Health & social care | 2017 |
| Laurel IT Consulting Limited | Information & communication | 2018 |
| Lavanta Cafe Limited | Hospitality | 2025 |
| Laws Compliance and Training Ltd | Real estate | 2014 |
| LBG International Limited | Manufacturing | 2006 |
| LDA Research Limited | Professional & scientific | 2011 |
| LE Maison Limited | Wholesale & retail | 1999 |
| Lean-Agile Digital Services Limited | Wholesale & retail | 2019 |
| Leap Aero Equity Ltd. | Financial services | 2024 |
| Leaping Lizards Day Nursery Ltd | Education | 2005 |
| Learn and Master (3 Counties) Limited | Education | 2016 |
| Learnremember Ltd | Information & communication | 2018 |
| Leasehold Cleaning Services Ltd | Administrative & support | 2021 |
| Ledgersys Limited | Information & communication | 2025 |
| LEE O'Flynn Construction Limited | Construction | 2019 |
| Leedham Analytics Limited | Information & communication | 2023 |
| Leeson Limited | Financial services | 2015 |
| Left Hand Drive Cars Ltd | Wholesale & retail | 2025 |
| Legacy Music Productions Ltd | Arts & recreation | 2019 |
| Legendastique Limited | Wholesale & retail | 2020 |
| Legende Celebrity Art Limited | Administrative & support | 2009 |
| Leisure Events (Barcelona) Limited | Administrative & support | 2005 |
| Lendingplus Limited | Professional & scientific | 2020 |
| Lenham Machinery Limited | Manufacturing | 1970 |
| Lens Global Ltd | Wholesale & retail | 2013 |
| Lens Innovation Holdings Limited | Professional & scientific | 2013 |
| Leonard Court (New Barnet) Limited | Households | 1992 |
| Letterbox 240 Film Limited | Information & communication | 2014 |
| Lexitrade Consulting Limited | Administrative & support | 2018 |
| Leyendo Ltd | Wholesale & retail | 2023 |
| LGN Consultancy Ltd | Administrative & support | 2021 |
| Liberty Hair Limited | Other services | 2014 |
| Licence Consultants Limited | Arts & recreation | 2016 |
| Life-U Limited | Professional & scientific | 2009 |
| Life-U Management Limited | Other services | 2015 |
| Lightbulb Talent Ltd | Extraterritorial | 2025 |
| Lightbulbworld Ltd | Wholesale & retail | 2011 |
| Lime-I.T. Limited | Wholesale & retail | 2000 |
| Limelinke Limited | Professional & scientific | 2018 |
| Limon 19 Limited | Professional & scientific | 2024 |
| Lincourt Limited | Administrative & support | 2014 |
| Linda Bembridge Ltd | Professional & scientific | 2007 |
| Lingvis Holdings Ltd | Real estate | 2018 |
| Links Road Golf Company Ltd | Arts & recreation | 2018 |
| Lisa Staines Limited | Administrative & support | 2014 |
| Little Cricket PR Ltd | Professional & scientific | 2016 |
| Little Ducklings Childcare Limited | Health & social care | 2018 |
| Little Learners Nursery Ltd | Education | 2024 |
| Live in the Light Naturally Ltd | Wholesale & retail | 2020 |
| Livewire Recruitment Limited | Administrative & support | 2010 |
| Liya Consultancy Ltd | Health & social care | 2020 |
| LJ Writing Services Ltd | Administrative & support | 2010 |
| Lloyds Wines Limited | Wholesale & retail | 2015 |
| LMK Communications Ltd | Professional & scientific | 2016 |
| LMR Aerials Ltd | Construction | 2023 |
| Loading Bay Equipment and Spares Ltd | Manufacturing | 2018 |
| Locanda Maria Limited | Hospitality | 2025 |
| Lochead Stratten Limited | Information & communication | 2004 |
| Lockco Limited | Extraterritorial | 2024 |
| Lodge Consultancy Services Ltd | Real estate | 2023 |
| Loganberry Limited | Administrative & support | 2008 |
| Lola Love Limited | Wholesale & retail | 2018 |
| Lombard Hotels Limited | Hospitality | 2005 |
| London Medtech Ltd | Health & social care | 2024 |
| London Pullman Tours Limited | Transport & logistics | 1990 |
| London Road Investments Limited | Construction | 2001 |
| London-Gastroenterology Associates Limited | Health & social care | 2012 |
| Longart Consulting Ltd | Professional & scientific | 2012 |
| Longworth & Longworth Limited | Administrative & support | 2008 |
| Loqness Technologies Ltd | Manufacturing | 2014 |
| Lorderwood Limited | Construction | 1992 |
| Lords Mill Development Ltd | Construction | 2019 |