| K C Electrical (South East) Limited | Administrative & support | 2010 |
| K Robinson Accountancy Services Limited | Professional & scientific | 2012 |
| K&J Surfacing Ltd | Construction | 2019 |
| K&M Property Management Services Ltd | Administrative & support | 2024 |
| K. Ruggins Construction Limited | Construction | 2011 |
| K.B. Cleans Ltd | Administrative & support | 2024 |
| KAA Holdings Limited | Real estate | 2016 |
| Kasatria Ltd | Information & communication | 2023 |
| Kavbro Plant Ltd | Administrative & support | 2016 |
| KDI Keston Consulting Limited | Information & communication | 2012 |
| KDP Painting & Decorating Limited | Administrative & support | 2006 |
| Kedd Professional Services Ltd | Construction | 2014 |
| Kelsey Flooring London Ltd | Construction | 2022 |
| Kent and Surrey Beauty Limited | Other services | 2016 |
| Kent Car Services (Westerham) Ltd | Wholesale & retail | 2016 |
| Kent Electrical Services & Consultancy Ltd | Construction | 2017 |
| Kent Transport Varga Limited | Transport & logistics | 2025 |
| Kent Waste Limited | Water & waste | 2017 |
| Kentish Oak Homes Limited | Construction | 2003 |
| Kentwood Homes Limited | Construction | 2009 |
| Keston Autos Limited | Wholesale & retail | 2012 |
| Kestongreyhound Ltd | Hospitality | 2025 |
| Keyhole Surgery Limited | Professional & scientific | 2008 |
| Kfff Properties Limited | Real estate | 2025 |
| Khse Services Ltd | Professional & scientific | 2020 |
| Kilkenny Wealth Management Ltd | Professional & scientific | 2019 |
| Kill Floor Film Limited | Information & communication | 2023 |
| Kimber & SON Roofing Ltd | Construction | 2022 |
| Kimber Contracts Limited | Construction | 2013 |
| Kinco Electrical Limited | Construction | 2012 |
| Kingies Castles Bouncy Castle Hire Ltd | Arts & recreation | 2022 |
| Kingston Pathology Ltd | Health & social care | 2017 |
| Kitchen by Harry Ltd | Hospitality | 2024 |
| KJL Accountancy Services Ltd | Professional & scientific | 2003 |
| KKS Property Services Ltd | Real estate | 2025 |
| Klaverson Ltd | Arts & recreation | 2025 |
| Klein Group Limited | Wholesale & retail | 2023 |
| KLJ Stacey Supported Accommodation CIC | Real estate | 2024 |
| Klose & Soan Banquets Limited | Hospitality | 2018 |
| Klose & Soan Catering Limited | Hospitality | 2017 |
| Kloudtech Ltd | Construction | 2023 |
| Knoal Estates Limited | Real estate | 2025 |
| Knockmoy Ltd | Construction | 2019 |
| Knowledgeably Ltd. | Professional & scientific | 2015 |
| KNP Project Control Ltd | Professional & scientific | 2025 |
| Kohler Advisory Solutions Ltd | Professional & scientific | 2018 |
| Konnecta Chauffeurs Ltd | Transport & logistics | 2026 |
| Kris Gardens Ltd | Administrative & support | 2020 |
| KSR Hospitality Ltd | Hospitality | 2026 |
| KSW Ltd | Professional & scientific | 2026 |
| KTL Paraplanning Ltd | Financial services | 2019 |
| Kustom Build Limited | Construction | 2009 |
| KW Billing Projects Limited | Construction | 2020 |
| KYC First Limited | Professional & scientific | 2014 |
| L Bromhead Limited | Administrative & support | 2009 |
| L Eagle Cleaning Company Limited | Administrative & support | 2011 |
| L Mckenna Lettings Ltd | Real estate | 2024 |
| L Mckenna Properties Ltd | Real estate | 2024 |
| L&B MEP Ltd | Professional & scientific | 2022 |
| L&R Motors Ltd | Wholesale & retail | 2019 |
| L'Auberge Holdings Limited | Professional & scientific | 2015 |
| LA Luna Restaurant Ltd | Hospitality | 2019 |
| LA Perla Medical Aesthetics Ltd | Health & social care | 2022 |
| LA Sports Ltd | Arts & recreation | 2022 |
| Labour One Limited | Agriculture & fishing | 2024 |
| Ladders to Lofts Ltd | Other services | 2017 |
| Laddingford Farm Limited | Agriculture & fishing | 2006 |
| Ladywell Gymnastics Club C.I.C | Arts & recreation | 2003 |
| Lanacre Tree Management Ltd | Other services | 2024 |
| Lanes Studio Ltd | Wholesale & retail | 2023 |
| Langley Annexe Limited | Arts & recreation | 2021 |
| Langscope Limited | Households | 2024 |
| Latitude 51 Procurement Ltd | Administrative & support | 2015 |
| Law Lifting Ltd | Transport & logistics | 2014 |
| Lawn Turf Group Ltd | Financial services | 2023 |
| LB Mechanical LDN Ltd | Professional & scientific | 2022 |
| LC Boxing Promotions Ltd | Real estate | 2024 |
| LC Installations London Ltd | Construction | 2018 |
| Lcls Technical Consultancy Limited | Professional & scientific | 2019 |
| LCW Scaffolding Ltd | Construction | 2018 |
| Ldgsheppard Ltd | Professional & scientific | 2024 |
| LE Blanc Properties Limited | Real estate | 2025 |
| LE Forts Limited | Professional & scientific | 2007 |
| LE Nominees Limited | Real estate | 2004 |
| Leafy Oak Property Services Ltd | Real estate | 2013 |
| LEE Marks Consulting Limited | Information & communication | 2019 |
| Legatus Consulting Ltd | Professional & scientific | 2023 |
| Less WE Forget CIC | Education | 2021 |
| Lewis Insight Limited | Information & communication | 2012 |
| Lewis-Smith Properties Ltd | Real estate | 2026 |
| Liberty Rose Acres Ltd | Agriculture & fishing | 2025 |
| Liberty Rose Architects Ltd | Professional & scientific | 2020 |
| Lift EAT Move Ltd | Arts & recreation | 2019 |
| Lift Pro Ltd | Construction | 2024 |
| Lift-Innovation Ltd | Construction | 2024 |
| Limewood Properties Limited | Real estate | 1995 |
| Limpsfield Ceramic Tiles Ltd | Wholesale & retail | 2012 |
| Limpsfield Combustion Engineering Co. Limited | Manufacturing | 1995 |
| Linen and Stone Ltd | Wholesale & retail | 2026 |
| Lipstick & Light Ltd | Information & communication | 2013 |