| Lksd Limited | Health & social care | 2025 |
| LL Kitchens Limited | Wholesale & retail | 2021 |
| Llewelyn-Bowen Design Limited | Professional & scientific | 2015 |
| Llords Limited | Construction | 2017 |
| LM & TM Properties Ltd | Real estate | 2020 |
| LM Research & Design Ltd | Professional & scientific | 2025 |
| LMA Partners Ltd | Construction | 2016 |
| LMB Group Ltd | Construction | 2017 |
| Lmmc Ltd | Administrative & support | 2025 |
| Lmnop Supplies Co Ltd | Manufacturing | 2025 |
| LN Visa Ltd | Administrative & support | 2021 |
| LNA Healthcare Ltd | Health & social care | 2024 |
| LNC Services Ltd | Administrative & support | 2018 |
| LNR Consultancy Ltd | Other services | 2020 |
| Load of Waffle Ltd | Hospitality | 2026 |
| Loanarranger Limited | Wholesale & retail | 2001 |
| Lobo Wolf Ltd | Manufacturing | 2020 |
| Local Meat Source LMS Limited | Wholesale & retail | 2025 |
| Local Media Holdings Limited | Information & communication | 2024 |
| Local Merchant Services Limited | Information & communication | 2017 |
| Local Spoon Co. Limited | Hospitality | 2025 |
| Localsky Property Management Limited | Real estate | 1990 |
| Lock Family Group Ltd | Construction | 2024 |
| Lock Keepers Mews Management Company Limited | Households | 2001 |
| Lock Services London Limited | Professional & scientific | 2018 |
| Lockboxer Ltd | Information & communication | 2026 |
| Lodestone Asset Management Ltd | Financial services | 2022 |
| Lodestone Capital Limited | Information & communication | 2012 |
| Lodestone Group Limited | Financial services | 2016 |
| Lodestone Investments Limited | Financial services | 2024 |
| Lodestone Operations Limited | Administrative & support | 2022 |
| Lodge Acquisitions Ltd | Real estate | 2023 |
| Lodge Media Ltd | Information & communication | 2014 |
| Lodge Properties Limited | Real estate | 1996 |
| Lodge Road Residents' Association Limited | Households | 1989 |
| Lodi Corporation Limited | Real estate | 2015 |
| Lodore Lodge Management Company Limited | Households | 2002 |
| Lodstone Properties Limited | Construction | 2009 |
| Lofato Limited | Real estate | 2023 |
| Logeswaran Empire Ltd | Hospitality | 2024 |
| Logic 5 Ltd | Professional & scientific | 2016 |
| Logikos Accountants Limited | Professional & scientific | 2022 |
| Logimar Courier Services Ltd | Transport & logistics | 2025 |
| Logistics K O Ltd | Transport & logistics | 2019 |
| Logisticus Ltd | Wholesale & retail | 2023 |
| Logo Fiasco Limited | Wholesale & retail | 2008 |
| Logytech Ltd | Information & communication | 2019 |
| Lois Leeming Consulting Ltd | Real estate | 2002 |
| Loka Construction Ltd | Construction | 2017 |
| Lokai Construction Group Ltd | Construction | 2021 |
| Loki Solutions Ltd | Information & communication | 2015 |
| Lola Cleaning & Ironing Services Ltd | Other services | 2018 |
| LOM Group Limited | Financial services | 2025 |
| Loma Care Limited | Health & social care | 2023 |
| Lomartire Ltd | Other services | 2018 |
| Lomas Court Management Company Limited | Households | 2012 |
| Lombardo Constructions Group Ltd | Construction | 2019 |
| Londinium FC Ltd | Arts & recreation | 2024 |
| London & Continental Investments (Friar Street) Limited | Real estate | 2001 |
| London & Surrey Roofing Ltd | Construction | 2016 |
| London & West END Properties Limited | Real estate | 1994 |
| London 24/7 Electrical Ltd | Information & communication | 2010 |
| London Aceone Technology Co Ltd | Wholesale & retail | 2022 |
| London ADV Limited | Administrative & support | 2005 |
| London Agro Ltd | Wholesale & retail | 2024 |
| London and Coastal Group CIC | Administrative & support | 2022 |
| London and Surrey Builders Ltd | Construction | 2026 |
| London Associates Investments Limited | Real estate | 2014 |
| London Ayur Medix Academy Ltd | Education | 2025 |
| London Borough of Croydon Holdings LLP | | 2017 |
| London Box Sash Windows Ltd | Manufacturing | 2010 |
| London Brain & Mind Ltd | Health & social care | 2025 |
| London Butchers and Grocers Limited | Wholesale & retail | 2009 |
| London Campus of Higher Studies Limited | Education | 2023 |
| London City Property Solutions Ltd | Real estate | 2024 |
| London Clamping Company Limited | Extraterritorial | 2002 |
| London College of Theology Limited | Education | 2021 |
| London Colour Ltd | Other services | 2012 |
| London Construction SMN Limited | Real estate | 2025 |
| London Construction Team Ltd | Construction | 2021 |
| London Crew Limited | Transport & logistics | 2011 |
| London Crown Chauffeurs Ltd | Transport & logistics | 2026 |
| London Dream Constructions Ltd | Construction | 2013 |
| London Entertainment (UK) Limited | Information & communication | 2014 |
| London Entertainment Studios Ltd | Other services | 2025 |
| London Equity Capital(Uk) Limited | Real estate | 2022 |
| London Estate Holdings Limited | Real estate | 2025 |
| London Estates Holdings LLP | | 2020 |
| London Executive Options Ltd | Transport & logistics | 2016 |
| London Flooring Supplies Limited | Other services | 1994 |
| London General Store Limited | Wholesale & retail | 2015 |
| London Health Suppliers Limited | Wholesale & retail | 2015 |
| London Herbal Clinic Ltd | Health & social care | 2018 |
| London Homeoutlet Limited | Wholesale & retail | 2019 |
| London Hub Limited | Real estate | 2020 |
| London Learning Consortium Community Interest Company | Education | 2007 |
| London Learning Foundation | Education | 2013 |
| London Local Cosmetics Limited | Other services | 2022 |
| London LUX Maintenance Ltd | Construction | 2022 |
| London Luxe Productions Ltd | Administrative & support | 2024 |