| London Zhong XIN Cuisine Limited | Hospitality | 2017 |
| Long Mynd Developments (Surrey) Limited | Construction | 2015 |
| Long Mynd Properties Limited | Real estate | 2015 |
| Longhurst and Highwood House Limited | Households | 2014 |
| Longprop Ltd | Real estate | 2022 |
| Longweston Property Limited | Households | 2012 |
| Lorin Construction Ltd | Construction | 2025 |
| Lost the Plot Productions Ltd | Information & communication | 2026 |
| Lotus Experts Ltd | Information & communication | 2025 |
| Loudspace Limited | Professional & scientific | 1998 |
| Louie Cristobal Limited | Health & social care | 2015 |
| Lous Haulage Ltd | Transport & logistics | 2021 |
| Love IS in the Hair Limited | Other services | 2016 |
| Love YOU BYE Limited | Hospitality | 2026 |
| Loveeating.Com Ltd | Administrative & support | 2010 |
| Loveeverything Group Employee Trustee Limited | Professional & scientific | 2015 |
| Loveeverything Group Limited | Administrative & support | 2015 |
| Loveeverything Parent Limited | Administrative & support | 2024 |
| Loveeverything.Com Limited | Administrative & support | 2010 |
| Lovemoney.Com Financial Services Limited | Financial services | 2008 |
| Lovemoney.Com Limited | Information & communication | 2010 |
| Lover Fighter Ltd | Professional & scientific | 2020 |
| LOW and Son's Ltd | Wholesale & retail | 2021 |
| Lowe IT Solutions Ltd | Professional & scientific | 2023 |
| Lower Consulting Ltd | Professional & scientific | 2025 |
| Loxton Consultancy Ltd | Professional & scientific | 2015 |
| Loxwood Limited | Administrative & support | 2007 |
| LR Bear Education Ltd | Education | 2014 |
| LR Digital Limited | Information & communication | 2020 |
| LS Group Holdings Ltd | Financial services | 2026 |
| LSS Relocation Limited | Other services | 2002 |
| Lswt Services Ltd | Construction | 2024 |
| Ltab Property Ltd | Real estate | 2017 |
| LTL Investments Ltd | Construction | 2025 |
| LU YU IP Ltd | Financial services | 2025 |
| Lucie Ailsa Studio Ltd | Arts & recreation | 2022 |
| Lucville Limited | Agriculture & fishing | 2021 |
| Lucy Timmons Coaching Ltd | Education | 2021 |
| Ludgate Square Enterprises Limited | Real estate | 1996 |
| Luke Taylor Videography Ltd | Information & communication | 2024 |
| Luki Fitted Furniture Ltd | Manufacturing | 2021 |
| Lulubell Limited | Professional & scientific | 2008 |
| Lumon Industries Ltd | Information & communication | 2023 |
| Lunar RM Limited | Professional & scientific | 2006 |
| Lupin Introductions Ltd | Financial services | 2022 |
| LUX Nails MT Ltd | Other services | 2024 |
| Luxteam Limited | Real estate | 1989 |
| Luxury Development Contractors Ltd | Real estate | 2025 |
| Luxury Stone Installers Ltd | Manufacturing | 2026 |
| LVB Surveying Ltd | Administrative & support | 2024 |
| LVD Health Ltd | Public administration | 2019 |
| LW Vending Solutions Ltd | Wholesale & retail | 2025 |
| LWB Fitness & Massage Ltd | Arts & recreation | 2025 |
| LXI Developments Ltd | Construction | 2023 |
| Lycidas Ltd | Information & communication | 2025 |
| Lydon Media Group Ltd | Information & communication | 2024 |
| Lymphatic Obsessed Ltd | Health & social care | 2025 |
| Lynchy Ltd | Real estate | 2015 |
| Lyne House Residents Company Limited | Households | 1994 |
| Lyne Lets Limited | Real estate | 2017 |
| Lynne IT Limited | Transport & logistics | 2025 |
| Lynver Developments Limited | Real estate | 2011 |
| Lynwood Court (Block a) RTM Company Ltd | Households | 2013 |
| Lynwood Court (Block B) RTM Company Ltd | Households | 2013 |
| Lynwood Court (Block C) RTM Company Ltd | Households | 2013 |
| Lyon Court (Horsham) Management Company Limited | Households | 1991 |
| Lzaf Limited | Administrative & support | 2011 |
| M & M Creative Management Limited | Arts & recreation | 1991 |
| M A.K E.A Limited | Manufacturing | 2022 |
| M B Accountancy Limited | Professional & scientific | 2002 |
| M Beasley Limited | Construction | 2016 |
| M Bradley Property Services Limited | Real estate | 2015 |
| M D FOX Limited | Construction | 2010 |
| M E Geal Limited | Construction | 2016 |
| M J Staples Property Management (Horsham) Limited | Real estate | 2012 |
| M P J Property Investments Limited | Real estate | 1960 |
| M R Stephenson Group Limited | Professional & scientific | 2006 |
| M R Stephenson Limited | Professional & scientific | 2002 |
| M S Oliver Ltd | Construction | 2009 |
| M Stein Ltd | Professional & scientific | 2015 |
| M&D Electrical Services Limited | Construction | 2021 |
| M&J Construction Services Ltd | Construction | 2016 |
| M&J Property Investors Ltd | Real estate | 2025 |
| M&M Logistics Service Ltd | Transport & logistics | 2021 |
| M&P Resources Ltd | Agriculture & fishing | 2021 |
| M&S Decorating Ltd | Construction | 2026 |
| M&T Accounting Limited | Professional & scientific | 2013 |
| M. Dilloway Ltd | Construction | 2014 |
| M. Geal Construction Limited | Construction | 2012 |
| M. Lake Plumbing & Heating Engineers Limited | Other services | 2002 |
| M.A.B. Investment Holdings Ltd | Real estate | 2023 |
| M.E. Charnaud & Sons Limited | Professional & scientific | 1967 |
| M.Mason Horsham Ltd | Hospitality | 2025 |
| M.T Inspect Limited | Public administration | 2025 |
| M2 Talent Limited | Administrative & support | 2022 |
| M3G Global Ltd | Professional & scientific | 2024 |
| Maav Capital Ltd | Real estate | 2026 |
| MAB Group Limited | Transport & logistics | 2024 |
| Mabuhay Limited | Wholesale & retail | 2025 |
| Macaulay Search Limited | Administrative & support | 2007 |