| Killer Commerce Limited | Wholesale & retail | 2024 |
| Kingfisher Close (Horley) Limited | Households | 2021 |
| Kirsty Frances Property Management Limited | Real estate | 2025 |
| Kith Coaches & Minibuses Limited | Transport & logistics | 2024 |
| Kitty Miller Consulting Ltd | Administrative & support | 2025 |
| Kiwi's Limited | Education | 2005 |
| KL Electrical Limited | Construction | 2017 |
| KLG Building Solutions Ltd | Construction | 2024 |
| Klod & Sons Ltd | Construction | 2026 |
| Kloe Ltd | Information & communication | 2021 |
| KMG (South) Ltd | Agriculture & fishing | 2023 |
| Knight Business Systems Limited | Information & communication | 2013 |
| Knock Back Store Ltd | Wholesale & retail | 2024 |
| Knoetze Ltd | Construction | 2011 |
| Knowledgefront Ltd | Information & communication | 2010 |
| Knox Motors Limited | Wholesale & retail | 2014 |
| KOI and Aquatics Limited | Wholesale & retail | 2012 |
| Koli’S Construction Limited | Construction | 2018 |
| Krijger Ltd | Professional & scientific | 2017 |
| Krystal Clear Cleaning Solutions Ltd | Administrative & support | 2025 |
| KS Race and Classic Ltd | Wholesale & retail | 2025 |
| KSA Designs Ltd | Professional & scientific | 2025 |
| Ktana Ltd | Professional & scientific | 2026 |
| Kuboz Digital Limited | Information & communication | 2024 |
| L Miles Associates Limited | Professional & scientific | 2014 |
| L Mills Consulting Ltd | Professional & scientific | 2022 |
| L Roser Renovations Limited | Construction | 2024 |
| L-Zinho Ltd | Professional & scientific | 2025 |
| L2L Consultancy Ltd | Professional & scientific | 2018 |
| LAB 17A Limited | Health & social care | 2014 |
| Ladder UP Ltd | Wholesale & retail | 2026 |
| Lador Limited | Real estate | 2020 |
| Lakehall Living Limited | Real estate | 2019 |
| Lala Bazars Restaurant Limited | Hospitality | 2024 |
| Lamond-Clarke Ltd | Manufacturing | 2024 |
| Lancaster HB Limited | Transport & logistics | 2023 |
| Lancaster UK Solutions Ltd | Administrative & support | 2017 |
| Lancing Driver Training Limited | Extraterritorial | 2005 |
| Langley Services Electrical Contractors Ltd | Construction | 2011 |
| Lark Partners Ltd | Households | 2025 |
| Lasam Surrey Ltd | Health & social care | 2023 |
| Laxius Technologies Ltd | Information & communication | 2025 |
| LE Lien Limited | Wholesale & retail | 1994 |
| Leader Hydraulics Limited | Wholesale & retail | 2011 |
| Learnr Ltd | Education | 2025 |
| Lebova Ltd | Real estate | 2023 |
| Legacy Collective Holding Ltd | Financial services | 2025 |
| Legacy-Direct Ltd. | Professional & scientific | 2017 |
| Legnatech Limited | Manufacturing | 2015 |
| Lehvar Limited | Information & communication | 2024 |
| Lemon Finance Limited | Financial services | 2024 |
| Lemon Tree Montessori Limited | Education | 2004 |
| Lemoneye Limited | Professional & scientific | 2002 |
| Lenny's Kids Song Factory Ltd | Information & communication | 2023 |
| Lenny's Studios Limited | Information & communication | 2012 |
| Lesley Anne Chuck Limited | Extraterritorial | 2024 |
| Lesley Anne Craen Limited | Extraterritorial | 2024 |
| Lesley Craen Limited | Information & communication | 2010 |
| Levelup Digital Development Ltd | Information & communication | 2023 |
| Lewin & Co Accountants Limited | Professional & scientific | 2017 |
| Lexination Limited | Information & communication | 2024 |
| LGL Cleaning Services Ltd | Administrative & support | 2023 |
| LGW Short Lets Limited | Real estate | 2016 |
| Lhmb Limited | Transport & logistics | 2023 |
| Lifestyle Plates Ltd | Manufacturing | 2020 |
| Lightup Foundation Limited | Other services | 2007 |
| Lightup Limited | Wholesale & retail | 2023 |
| Lilkye Limited | Real estate | 2020 |
| Lily Creative Ltd | Information & communication | 2026 |
| Lingfield Cars Limited | Administrative & support | 2017 |
| Linnell Court Healthcare Limited | Health & social care | 2017 |
| Lion Landscaping Ltd | Administrative & support | 2019 |
| Liqqui Ltd | Professional & scientific | 2024 |
| Listander Productions Limited | Information & communication | 2007 |
| Little Legends Life Coaching Ltd | Administrative & support | 2026 |
| Littlefair Care Home Limited | Health & social care | 2015 |
| LJ Partners Limited | Administrative & support | 2025 |
| LJP Hair & Makeup Ltd | Other services | 2022 |
| LMA Autoparts Limited | Wholesale & retail | 1999 |
| Lmespiritu Ltd | Health & social care | 2015 |
| Local Business Networking Limited | Other services | 2017 |
| Local Maintenance Team Limited | Construction | 2013 |
| Localize Pros Ltd | Professional & scientific | 2024 |
| Loft Craft London Warranties Ltd | Professional & scientific | 2019 |
| Lola & Ruby Limited | Manufacturing | 2021 |
| London and Surrey Montessori Schools Ltd | Education | 2012 |
| London Fire and Security Limited | Administrative & support | 2018 |
| London Fire Surveyors Limited | Professional & scientific | 2024 |
| London Mechanical Solutions Ltd | Construction | 2020 |
| London Plumbing Limited | Construction | 2010 |
| Lorch Studios Ltd | Professional & scientific | 2024 |
| Lotusium Products Ltd | Wholesale & retail | 2021 |
| Lowland Consultants Limited | Health & social care | 2007 |
| Loxwood (Oatlands Chase) Management Company Limited | Real estate | 2009 |
| LRM Roofing Ltd | Construction | 2025 |
| LSM Service Solutions Ltd | Administrative & support | 2020 |
| LT Plant Hire (South East) Ltd | Administrative & support | 2025 |
| Lucden Limited | Real estate | 2024 |
| Luckyfish Recruitment Limited | Extraterritorial | 2020 |
| Lugan Homes Limited | Real estate | 2025 |