| Larkspur Court Management Limited | Real estate | 1973 |
| Laryngograph Limited | Manufacturing | 1973 |
| Lash Ville London Ltd | Other services | 2024 |
| Last Drop Wines Limited | Wholesale & retail | 2008 |
| Last Fashion (UK) Ltd | Wholesale & retail | 2012 |
| Launderclean Epsom Limited | Other services | 2013 |
| Lauren Victoria Lambert Limited | Wholesale & retail | 2023 |
| Lavender Care Agency Ltd | Other services | 2016 |
| Lavender Care Recruitment Ltd | Administrative & support | 2025 |
| Lavender Fresh Ltd | Other services | 2014 |
| Lavinia Ceylon Limited | Hospitality | 2024 |
| Lawton Print Design Limited | Administrative & support | 2014 |
| Laxmi Nivesh Limited | Real estate | 2019 |
| Lays Construction Ltd | Construction | 2019 |
| LBE Properties Ltd | Real estate | 2024 |
| Lbstellar Ltd | Health & social care | 2020 |
| Ld's House Ltd | Real estate | 2020 |
| Ldcarts Limited | Wholesale & retail | 2025 |
| LDM Media Ltd | Arts & recreation | 2022 |
| LDS Heating Services Limited | Construction | 2012 |
| LE Beau Lighting Company Limited | Wholesale & retail | 2016 |
| Leaderpromos UK Limited | Wholesale & retail | 2020 |
| Leading Eagle Building Service Ltd | Construction | 2024 |
| Leadlogix Ltd | Hospitality | 2024 |
| Leads Business Ltd | Information & communication | 2024 |
| Leap Online Ltd | Professional & scientific | 2022 |
| Learn 2 Live Ltd | Health & social care | 2008 |
| Learning 2 Care Limited | Health & social care | 2021 |
| Leat Apartments Ltd | Real estate | 2016 |
| LED N Solar PV Ltd | Manufacturing | 2011 |
| LEE Building Construction Solutions Ltd | Construction | 2020 |
| Leema Properties Investment Ltd | Real estate | 2023 |
| Legal Systems (Administration) Limited | Professional & scientific | 1997 |
| LEJ Building Ltd | Construction | 2025 |
| Lemar Property Group Ltd | Real estate | 2026 |
| Leoli Dental Laboratory Ltd | Manufacturing | 2025 |
| Lequarl Consulting Limited | Health & social care | 2009 |
| Lesley Court (Management) Company Limited | Hospitality | 1981 |
| Lesley-Anne Delapena Ltd | Professional & scientific | 2014 |
| Leslie George Services Ltd | Manufacturing | 2021 |
| Lester Languages Ltd | Education | 2022 |
| Lets DO Entertainment Limited | Arts & recreation | 2012 |
| Level UP Youth Limited | Health & social care | 2018 |
| Lewisford Electrical Ltd | Energy | 2015 |
| Leya's Lets Ltd | Real estate | 2023 |
| Lhro Ltd | Other services | 2017 |
| Lifestyle Window Systems Limited | Construction | 2005 |
| Lighthouse Brookes Ltd | Professional & scientific | 2014 |
| Lighthouse Web Solutions Limited | Information & communication | 2018 |
| LIGHTHOUSE.SOLUTIONS369 Ltd | Manufacturing | 2025 |
| Lightware Technologies Ltd | Manufacturing | 2023 |
| Lincoln House Freehold Wallington Ltd | Households | 2024 |
| Lincoln House Wallington Ltd | Households | 2025 |
| Lines Shipping Trade Ltd | Agriculture & fishing | 2022 |
| Linkfield Physiotherapy & Sports Injury Clinic Ltd | Health & social care | 2012 |
| Linley Court Residents Company Limited | Households | 1993 |
| Lionacre Investments Ltd | Financial services | 2011 |
| Liquor Library Cocktails & Afrik Canapes Limited | Hospitality | 2020 |
| Little Fish Projects Ltd | Construction | 2017 |
| Little London Kids Ltd | Other services | 2020 |
| Little Pumpkins Photography Ltd | Professional & scientific | 2026 |
| Little Sensory Hub Ltd | Health & social care | 2026 |
| Littlellas Childcare Ltd | Health & social care | 2025 |
| Littletix Limited | Wholesale & retail | 2024 |
| Live & Learn Limited | Health & social care | 1994 |
| Live for Football Ltd | Arts & recreation | 2022 |
| Living Word Worship Ministry London CIC | Health & social care | 2024 |
| LJB Electrical Services Limited | Construction | 2003 |
| LJB Group Ltd | Construction | 2010 |
| Lmentary Limited | Information & communication | 2024 |
| LNO Property Management Ltd | Real estate | 2025 |
| Load and Lock Recovery Ltd | Transport & logistics | 2019 |
| Local Group Ltd | Construction | 2015 |
| Lockington Battersea Park Company Limited | Households | 2019 |
| Locks 2 DO Limited | Construction | 2012 |
| Logic 22 Limited | Transport & logistics | 2022 |
| Logicology Ltd | Wholesale & retail | 2020 |
| Logistic Recovery Solutions Ltd | Professional & scientific | 2005 |
| Logitax Limited | Professional & scientific | 2013 |
| Lokata Investments Ltd | Financial services | 2018 |
| London & Surrey Building Ltd | Construction | 2023 |
| London Accident Claims Limited | Financial services | 2005 |
| London Accident Cover Limited | Administrative & support | 2016 |
| London and Surrey Bathrooms Ltd | Construction | 2015 |
| London Cartel Industries Ltd | Arts & recreation | 2017 |
| London Cleaning Management Ltd | Administrative & support | 2025 |
| London Content Studio Ltd | Professional & scientific | 2026 |
| London Dynasty Cheer | Arts & recreation | 2025 |
| London Hormone Clinic Limited | Health & social care | 2016 |
| London KK Events Limited | Hospitality | 2020 |
| London Letting & Property Management Ltd | Real estate | 2013 |
| London Luxury Property Management Ltd | Households | 2021 |
| London Manufacturing Limited | Manufacturing | 2013 |
| London Road Post Ltd | Transport & logistics | 2026 |
| London Steward Mission Ltd | Professional & scientific | 2024 |
| London Web World Limited | Professional & scientific | 2013 |
| Look Electrical Solutions Ltd | Administrative & support | 2012 |
| Lorgwood Limited | Professional & scientific | 2018 |
| Love & Care Health Ltd | Health & social care | 2015 |
| Lovebusiness Ltd | Wholesale & retail | 2025 |