| Little Oaks Nurseries Ltd | Education | 2012 |
| Littlegold Consulting Limited | Professional & scientific | 2015 |
| LIV & Ltd | Administrative & support | 2018 |
| Livfit LDN Ltd | Other services | 2023 |
| Livingston Luxe Clean Limited | Administrative & support | 2025 |
| Ljhc Limited | Financial services | 2021 |
| LKB Electrical Ltd | Construction | 2023 |
| Lloyds Scaffolding Limited | Extraterritorial | 2006 |
| Lnkb Limited | Real estate | 2021 |
| Locket Consultancy Limited | Professional & scientific | 2023 |
| Locus Intellect Limited | Information & communication | 2011 |
| Loftkeys Ltd | Real estate | 2025 |
| London 360 Group Ltd | Information & communication | 2020 |
| London Collectors Cars Limited | Wholesale & retail | 2019 |
| London Express Europe Limited | Wholesale & retail | 1996 |
| London Luxury Chauffeurs Ltd | Transport & logistics | 2025 |
| London Pilsner Limited | Wholesale & retail | 1994 |
| London Plumbing 247 Ltd | Construction | 2019 |
| London Sports Orthopaedics LLP | | 2008 |
| London Wheel Media Ltd | Professional & scientific | 2024 |
| Londonnaz Ltd | Transport & logistics | 2025 |
| Lone Star Partners LLP | | 2017 |
| Longevity Healthcare Ltd | Administrative & support | 2025 |
| Longford Developments Limited | Construction | 2017 |
| Longford Securities & Equities (K & T) Limited | Construction | 2003 |
| Looks London Salon Ltd | Other services | 2023 |
| Loomberg Limited | Wholesale & retail | 2026 |
| Lotus 2020 Limited | Real estate | 2020 |
| Lotus Hardware Ltd | Wholesale & retail | 2013 |
| Lotus Lifestyle Limited | Professional & scientific | 2025 |
| Lotus Mews Limited | Real estate | 2022 |
| Lotus Technologies Ltd | Information & communication | 2013 |
| Louis Pierre Limited | Hospitality | 2011 |
| Louis Whitefield Limited | Professional & scientific | 2009 |
| Love the Process Ltd | Health & social care | 2026 |
| LRP Investments Ltd | Real estate | 2021 |
| LRP Retail Ltd | Wholesale & retail | 2025 |
| Lsam Limited | Extraterritorial | 2011 |
| LTK Private Limited | Health & social care | 2010 |
| LTK Properties Private Ltd | Real estate | 2021 |
| Luciano Venetian Builders Ltd | Construction | 2016 |
| Luckey Services Ltd | Manufacturing | 2020 |
| Lunn & Company Limited | Construction | 2022 |
| Luxcia Limited | Manufacturing | 2011 |
| Luxe Competitions Limited | Professional & scientific | 2026 |
| Luxe Invest Limited | Real estate | 2018 |
| Luxme Health Limited | Wholesale & retail | 2015 |
| Luxumi Homes Limited | Real estate | 2007 |
| Luxumi Limited | Construction | 2006 |
| Luxury and Green Homes Limited | Professional & scientific | 2019 |
| Luxury Glam Beauty Ltd | Other services | 2024 |
| Luxury Horse Transport Limited | Transport & logistics | 2008 |
| Lynar Manufacturing Limited | Manufacturing | 2011 |
| Lynestone Construction Limited | Construction | 2019 |
| Lynx Corp Limited | Real estate | 2015 |
| Lynxcorby Ltd | Real estate | 2021 |
| LYV Drylining Ltd | Construction | 2021 |
| M & P Developments (Bushey) Limited | Real estate | 2014 |
| M & S Groundworks Grab Hire Limited | Construction | 2013 |
| M Botting Limited | Hospitality | 2011 |
| M G Hotels Limited | Hospitality | 1997 |
| M J Barber (Northwood Hill) Ltd | Other services | 2023 |
| M J R Property Group Limited | Real estate | 2018 |
| M K Building Contractors (UK) Limited | Construction | 2000 |
| M&J Harvey Legal Consultancy Ltd | Professional & scientific | 2021 |
| M&O Storage Limited | Agriculture & fishing | 2018 |
| M&S Grab Hire Ltd | Construction | 2020 |
| M&S Plant Hire Limited | Administrative & support | 2019 |
| M&Z Trading & Investment Ltd | Professional & scientific | 2015 |
| M. G. Media Ltd. | Arts & recreation | 1996 |
| M.A.K. Enterprises Limited | Wholesale & retail | 2003 |
| M.M.C. Building Contractors Limited | Construction | 1997 |
| M4 Nivas Limited | Real estate | 2025 |
| Macintyre Consulting Ltd | Information & communication | 2007 |
| Mackenzie - Kinmont Limited | Real estate | 1990 |
| Macris Glass Ltd | Construction | 2019 |
| Macro Eagle Ltd | Professional & scientific | 2018 |
| Madhav Empires UK Ltd | Wholesale & retail | 2025 |
| Maerz Consulting Ltd | Financial services | 2007 |
| Mag-Mil Ltd | Wholesale & retail | 2023 |
| Mahtan Developments Limited | Real estate | 2001 |
| Maji Wiseman Consulting Limited | Administrative & support | 2018 |
| MAK Beauty Ltd | Arts & recreation | 2024 |
| Makati Ltd | Professional & scientific | 2025 |
| Make Space Liverpool Limited | Real estate | 2015 |
| Make Space Redvers Limited | Real estate | 2015 |
| Makrupa International Limited | Wholesale & retail | 2025 |
| Maktoday Online Services UK Limited | Administrative & support | 2020 |
| Malci Developments Limited | Construction | 2022 |
| Malci Holdings Limited | Financial services | 2022 |
| Malci Plant Hire Limited | Construction | 2022 |
| Malkan Property Services Ltd | Real estate | 2025 |
| Malt Kiln Properties Ltd | Real estate | 2018 |
| Mamtora Properties Limited | Real estate | 2024 |
| Managed by Alex Limited | Professional & scientific | 2012 |
| Manageone Limited | Professional & scientific | 2014 |
| Mandan Estates Ltd | Real estate | 2020 |
| Mandeville Court Property Company Limited | Construction | 2004 |
| Mangalam Properties Limited | Real estate | 2025 |
| Mangio Italiano Ltd | Hospitality | 2025 |