| Lexscale Labs Ltd. | Professional & scientific | 2021 |
| Leyshon Medical Limited | Health & social care | 2013 |
| Liberty Lane Freehold Management Limited | Real estate | 2014 |
| Life Sicl Limited | Professional & scientific | 2019 |
| Lifenav UK Ltd | Information & communication | 2021 |
| Lighthouse Plus Ltd | Construction | 2025 |
| Lighthouse Protocol Limited | Real estate | 2014 |
| Lightwater Grange Management Company (NO.1) Limited | Households | 1984 |
| Limewood Court Residents Management Company Limited | Households | 2017 |
| Limited by Sleep Ltd | Information & communication | 2025 |
| Linthwaite House Limited | Hospitality | 1989 |
| Little Lanes Pre-School Limited | Education | 2011 |
| Little Learners Land (London Colney) Limited | Education | 2021 |
| Little Learners Land Nurseries Limited | Financial services | 2022 |
| LJ Hannaford-Naisbitt Ltd | Professional & scientific | 2024 |
| LJ Mechanical Ltd | Wholesale & retail | 2022 |
| LM05 Limited | Arts & recreation | 2020 |
| Logistic Freight Services Limited | Transport & logistics | 1996 |
| Loka Brickwork Ltd | Construction | 2021 |
| Loncin Mead Management Company Limited | Real estate | 2008 |
| London General Surgery Ltd | Health & social care | 2011 |
| London Property Care Ltd | Construction | 2015 |
| London Skin Bar Ltd | Health & social care | 2022 |
| London Spray Finishes Limited | Construction | 2014 |
| Londondecal Ltd | Manufacturing | 2017 |
| Loose Fit Records Limited | Information & communication | 2019 |
| Lorna's Indian Kitchen Ltd | Hospitality | 2023 |
| Lost for Words Theatre Company Ltd | Arts & recreation | 2019 |
| Lottie Saunders Bookkeeping Ltd | Professional & scientific | 2020 |
| Lovaine Testing Services Ltd | Professional & scientific | 2014 |
| Love Lane (Faversham) Management Company Limited | Households | 2018 |
| Loxley Close Management Company Limited | Real estate | 2006 |
| Lozecom Ltd | Wholesale & retail | 2026 |
| LPC Recruitment Limited | Administrative & support | 2017 |
| LPM (Group Services) Limited | Administrative & support | 1982 |
| LR Clouds Limited | Information & communication | 2009 |
| LSR Cleaning Services Ltd | Administrative & support | 2018 |
| LSR Garden & Estate Maintenance Ltd | Administrative & support | 2023 |
| Luby Property Ltd | Real estate | 2024 |
| Luca.M Hair Limited | Other services | 2018 |
| Luchidacina Ltd | Transport & logistics | 2017 |
| Lucid View Investments Limited | Real estate | 2020 |
| Lucid View Limited | Professional & scientific | 2003 |
| Lucky Lingerie Ltd | Manufacturing | 2023 |
| Luddington Golf Limited | Arts & recreation | 2005 |
| Luigi.M Hairdressing Limited | Other services | 2003 |
| Lumen Design House Limited | Professional & scientific | 2026 |
| Lumenink Limited | Manufacturing | 2026 |
| Lumetric Technology Limited | Information & communication | 2026 |
| Lunahart Ltd | Other services | 2024 |
| Lunar Heights Tech Limited | Information & communication | 2025 |
| Lundin Mining UK Limited | Administrative & support | 2007 |
| Lunn Geotechnical Services Limited | Professional & scientific | 2013 |
| Lupama Limited | Hospitality | 2025 |
| Lush Accommodations Company Limited | Real estate | 2025 |
| Luxury Barber 23 Ltd | Other services | 2026 |
| Lymington Self Storage Limited | Administrative & support | 2012 |
| Lyne Hill Developments Limited | Administrative & support | 2005 |
| M & J Enterprises Limited | Wholesale & retail | 2008 |
| M M Edstrom Advisory Ltd | Professional & scientific | 2015 |
| M W Magic Ltd | Construction | 2013 |
| M&A Consultancy Ltd | Information & communication | 2010 |
| M&Ecoacheshire Ltd | Transport & logistics | 2025 |
| M&W Estates Ltd | Real estate | 2017 |
| M, J & H Consulting Limited | Professional & scientific | 2025 |
| M.A. Ulpindo Limited | Health & social care | 2021 |
| M.A.C. Developments Limited | Information & communication | 1990 |
| M.R Restaurant Ltd | Hospitality | 2023 |
| MAC Project Solutions Limited | Administrative & support | 2013 |
| Maccon Jones Limited | Information & communication | 2014 |
| Machicado Services Ltd | Professional & scientific | 2023 |
| Mack Newhaw Limited | Real estate | 2022 |
| Mack Ventures Limited | Financial services | 2022 |
| Mackenzie Page Developments Limited | Real estate | 2014 |
| Madcam Building Services Ltd | Construction | 2015 |
| Mads Gaming Ltd | Wholesale & retail | 2026 |
| Magic Aggregates Ltd | Administrative & support | 2023 |
| Magical Math's - North Surrey Ltd | Education | 2023 |
| Magical Moments Pre-School Limited | Education | 2013 |
| Mahalingam Holdings Ltd | Financial services | 2026 |
| Majestic Design and Build Limited | Construction | 2014 |
| Makasi Imports Limited | Wholesale & retail | 2014 |
| Mako Web Solutions Ltd | Information & communication | 2026 |
| Makwin Consulting Ltd | Information & communication | 2008 |
| Malone Sandwiches Limited | Hospitality | 2025 |
| Mangia Studios Limited | Wholesale & retail | 2023 |
| Manning Rigging Ltd | Construction | 2025 |
| Mannings Truly Scrumptious Ltd | Manufacturing | 2020 |
| Manorcroft Property Ltd | Real estate | 2026 |
| Mantle Evolution Limited | Information & communication | 2017 |
| Maple Motorhouse Ltd | Wholesale & retail | 2023 |
| MARCY71 Ltd | Manufacturing | 2020 |
| Mario M Ltd | Transport & logistics | 2017 |
| Marisalin Ltd | Wholesale & retail | 2025 |
| Mark Glenister Film Ltd | Information & communication | 2020 |
| Mark Woolger Foodservice Solutions Limited | Hospitality | 2012 |
| Market Centre Ltd | Wholesale & retail | 2011 |
| Marketing Alpha Ltd | Professional & scientific | 2017 |
| Marlow's Carpentry Ltd | Construction | 2016 |
| Marshall Ventures Ltd | Professional & scientific | 2018 |