| LS Britains Homes Limited | Real estate | 2016 |
| LS Complete Interiors Ltd | Construction | 2020 |
| Lsba Company Ltd | Real estate | 2021 |
| Lskefi Limited | Financial services | 2021 |
| LSP Holidays and Vacations Ltd | Professional & scientific | 2025 |
| LTC Employment Ltd | Administrative & support | 2026 |
| Ltwr Limited | Financial services | 2012 |
| Lucale Ltd | Other services | 2023 |
| Lucas Developments & Properties Ltd | Construction | 2025 |
| Luccenergy Ltd | Administrative & support | 2019 |
| Luccombe View Ltd | Construction | 2022 |
| Lucham Limited | Professional & scientific | 2018 |
| Lucid Notions Limited | Professional & scientific | 2005 |
| Lucisai Ltd | Information & communication | 2024 |
| Lucky Bean Productions Limited | Information & communication | 2021 |
| Lucky Ghost Studios Ltd | Manufacturing | 2024 |
| Lucky Paws Limited | Other services | 2017 |
| Lucky Paws Surrey Ltd | Other services | 2023 |
| Luggage Logistics Ltd | Information & communication | 2007 |
| Luklor Properties Ltd | Real estate | 2023 |
| Lula Productions Ltd | Arts & recreation | 2018 |
| Lumen & Lock Ltd | Wholesale & retail | 2026 |
| Lumineer Consulting Ltd | Professional & scientific | 2025 |
| Luminus Insight CIC | Health & social care | 2013 |
| Lumious Limited | Professional & scientific | 2018 |
| Lunan Property Developments Limited | Financial services | 2012 |
| Lusso Performance Ltd | Wholesale & retail | 2024 |
| LUV to Care Ltd | Health & social care | 2014 |
| LUX Stay Group Holdings Limited | Real estate | 2022 |
| Luxford Digital Ltd. | Professional & scientific | 2015 |
| Luye Pharma Ltd | Wholesale & retail | 2018 |
| LV Assistance Services Limited | Manufacturing | 1928 |
| LV Insurance Management Limited | Administrative & support | 2005 |
| LV Repair Services Limited | Wholesale & retail | 2014 |
| LV2 Ltd | Wholesale & retail | 2022 |
| LW Solutions Seventy Ltd | Professional & scientific | 2020 |
| LXG Ltd | Wholesale & retail | 2025 |
| LY Ventures Ltd | Wholesale & retail | 2025 |
| Lycaon Limited | Professional & scientific | 2014 |
| Lychgate Youth Trust | Arts & recreation | 2000 |
| Lyco Group Limited | Administrative & support | 1994 |
| Lylebarn Limited | Wholesale & retail | 1995 |
| Lymberg Limited | Professional & scientific | 2007 |
| Lynchpin Consulting Limited | Professional & scientific | 2018 |
| Lynne Court Management Limited | Households | 1969 |
| Lynton Intuition Limited | Information & communication | 1994 |
| Lynx Driving School Ltd | Education | 2025 |
| Lytle Associates Architects Limited | Professional & scientific | 1996 |
| Lytle Associates Trustees Limited | Administrative & support | 2021 |
| Lytton Bros. Pictures Ltd | Information & communication | 2020 |
| M & E (PVT) Ltd | Health & social care | 2022 |
| M & R Barbers Ltd | Other services | 2016 |
| M Beauty Clinic Ltd | Other services | 2025 |
| M J Fisher Services Limited | Construction | 2016 |
| M J Lawrence ADR Ltd | Administrative & support | 2025 |
| M J Masonry Ltd | Construction | 2024 |
| M J Pryce Builders Ltd | Construction | 2019 |
| M M K Electrical Contractors Ltd | Construction | 2010 |
| M R Research Systems Ltd | Professional & scientific | 2002 |
| M S West, a R Vary, S P Jones Trading AS Westward Building Limited | Construction | 2011 |
| M Weightman Consultancy Limited | Administrative & support | 2012 |
| M Worldwide Limited | Professional & scientific | 2001 |
| M&M Beauty & Aesthetic Ltd | Other services | 2022 |
| M.A.S.K. Personal Training Limited | Health & social care | 2019 |
| M.K.H. Trading Ltd | Other services | 2010 |
| M.P.S. Design Ltd | Professional & scientific | 2006 |
| M.R. Surrey Properties Ltd | Real estate | 2022 |
| M2 Project Engineering Ltd. | Construction | 2022 |
| M:Tech Education Services Limited | Education | 2005 |
| Maavrx Ltd | Professional & scientific | 2017 |
| MAB Electrical Limited | Extraterritorial | 2020 |
| Maber Construction & Interiors Limited | Construction | 2009 |
| Maber Design Limited | Professional & scientific | 2015 |
| Maber Group Limited | Professional & scientific | 2016 |
| Maber London Limited | Construction | 2026 |
| MAC Homes D&B Ltd | Construction | 2023 |
| Mach Fang Limited | Professional & scientific | 2025 |
| Machine Moving Image Creative Limited | Information & communication | 2015 |
| Machinehead Moto Ltd | Wholesale & retail | 2023 |
| Mack 1 Solutions Limited | Other services | 2008 |
| Mackay Family Property Holdings Limited | Financial services | 2026 |
| Mackel Group Limited | Professional & scientific | 2026 |
| Mackerel Sky Limited | Information & communication | 2024 |
| Mackey-Dokey Limited | Wholesale & retail | 2020 |
| MAD Lake Ltd | Information & communication | 2024 |
| Maddalena Minerva Limited | Administrative & support | 2022 |
| Maddin PR Limited | Professional & scientific | 2015 |
| Madeira Enterprises Limited | Real estate | 2023 |
| Madge Consultancy Ltd | Professional & scientific | 2012 |
| Madgehole Ventures Ltd | Financial services | 2019 |
| Maen Investments Ltd | Financial services | 2018 |
| Maeskn Clinic Ltd | Other services | 2024 |
| Magcell Limited | Wholesale & retail | 2015 |
| Magenta City Limited | Real estate | 2011 |
| Magenta Storage Limited | Wholesale & retail | 2001 |
| Magic Notion Ltd | Information & communication | 2013 |
| Magical Display Ltd | Wholesale & retail | 2003 |
| Magiq Football Limited | Education | 2025 |
| Magna Coaching Limited | Education | 2011 |
| Magnetic Innovations Ltd | Wholesale & retail | 2018 |