| KMP Group (UK) Limited | Information & communication | 2022 |
| Knight Investment Properties Ltd | Real estate | 2014 |
| Knightbrooks Ltd | Professional & scientific | 2019 |
| Knighton Field Limited | Real estate | 1978 |
| Knights Developments Limited | Construction | 2017 |
| Knightsbridge Capital (Wapping) Limited | Real estate | 2014 |
| Knightsbridge Capital Limited | Real estate | 2013 |
| Knobbly Knees Ltd | Wholesale & retail | 2020 |
| Knocker & Foskett | | 2003 |
| Knockholt Metals Limited | Wholesale & retail | 2019 |
| Knockholt Properties Limited | Wholesale & retail | 2012 |
| Knole Academy Enterprises | Arts & recreation | 2014 |
| Knole Associates Ltd | Construction | 2015 |
| Knole Cars Limited | Transport & logistics | 2025 |
| Knole Joinery Ltd | Manufacturing | 2019 |
| Knole Legal Services Limited | Professional & scientific | 2023 |
| Knole Park Golf Club Limited | Other services | 1924 |
| Knole Securities Limited | Construction | 1982 |
| Knoller Limited | Information & communication | 2017 |
| Koivu Ltd | Manufacturing | 2017 |
| Koka Carpentry & Roofing Ltd | Construction | 2023 |
| Kolle Interiors Ltd | Wholesale & retail | 2024 |
| Komododev Ltd | Information & communication | 2020 |
| Konnected Marketing and Communications Ltd | Professional & scientific | 2024 |
| Kool Kidz Ltd | Health & social care | 2021 |
| Kpcr Dental Ltd | Health & social care | 2025 |
| KPM Fabrications Limited | Construction | 2001 |
| KPM Group Holdings Ltd | Manufacturing | 2019 |
| KPM Media Events Limited | Administrative & support | 2023 |
| KPM Media Limited | Manufacturing | 2013 |
| KR Neon Ltd | Manufacturing | 2023 |
| Kratos Holdings Ltd | Professional & scientific | 2023 |
| Kratos IT Ltd | Information & communication | 2020 |
| Kraus Kitchens Ltd | Construction | 2018 |
| Krolewiak Consulting Limited | Information & communication | 2016 |
| Kromanti Ltd | Wholesale & retail | 2019 |
| Kruhm Limited | Professional & scientific | 2020 |
| KSD Property Group Ltd | Real estate | 2026 |
| KSM Bookkeeping Ltd | Professional & scientific | 2014 |
| KT Project Services Limited | Information & communication | 2007 |
| Ktsm Ltd | Construction | 2016 |
| Kudu Media Limited | Arts & recreation | 2008 |
| Kuernos Ltd | Information & communication | 2005 |
| Kurko Project Consultants Ltd | Professional & scientific | 2025 |
| Kway Holdings Limited | Administrative & support | 2000 |
| Kwuk Ltd | Information & communication | 2019 |
| KX2 Solutions Ltd | Wholesale & retail | 2025 |
| L & B Asset Management Ltd | Real estate | 2019 |
| L & G Signs (UK) Limited | Extraterritorial | 2009 |
| L & G Signs Limited | Professional & scientific | 1999 |
| L & N Platforms Limited | Administrative & support | 2011 |
| L a G Distribution Ltd | Wholesale & retail | 2025 |
| L B B R Estates Limited | Real estate | 2017 |
| L D Carpentry Ltd | Construction | 2018 |
| L Helt Accountancy Services Limited | Professional & scientific | 2015 |
| L J Personal Travel Limited | Administrative & support | 2006 |
| L&A Catering Services Ltd | Hospitality | 2022 |
| L&M Estates Holdings Limited | Real estate | 2026 |
| L&V Ltd | Wholesale & retail | 2013 |
| L&W London Co Ltd | Real estate | 2025 |
| L'Ombrello Limited | Hospitality | 2017 |
| L'Étoile Polaire Limited | Administrative & support | 2019 |
| L.M. Murphy Limited | Real estate | 2010 |
| LA Casa DEL Padel Limited | Arts & recreation | 2025 |
| LA Manica Limited | Wholesale & retail | 2010 |
| LA Rose Porsche Ltd. | Wholesale & retail | 2003 |
| LA Rosiere Hotel Limited Partnership | | 2016 |
| LA Victoria Productions Limited | Information & communication | 2017 |
| Laddsoft Limited | Information & communication | 2005 |
| Ladies Joggers UK Limited | Health & social care | 2011 |
| Lady & the Tramp Groomers Ltd | Other services | 2024 |
| LAI LAI Limited | Wholesale & retail | 2023 |
| Lake District Cabins Ltd | Hospitality | 2008 |
| Lakeo Developments Limited | Construction | 2021 |
| Lakeside Apartments (Sevenoaks) Limited | Households | 2000 |
| Lakeside Court Sevenoaks Limited | Households | 1975 |
| Lakeview Assets Ltd | Other services | 2025 |
| Lakeview Construction Services Limited | Professional & scientific | 2011 |
| Lakeview Consulting Ltd | Professional & scientific | 2019 |
| Lakeview Southern Audit Limited | Professional & scientific | 2019 |
| Lakeview Southern Holdings Ltd | Professional & scientific | 2019 |
| Lakshmi Advisory Ltd | Information & communication | 2026 |
| LAM Plan Industries Limited | Manufacturing | 1998 |
| Lamberhurst Winery Limited | Real estate | 2013 |
| Lamps Theatre & Arts CIC | Arts & recreation | 2023 |
| Lamtarra Management Company Limited | Households | 2006 |
| Lana Banana Ltd | Financial services | 2021 |
| Lancaster Waste Management Limited | Water & waste | 2024 |
| Land Equity Limited | Construction | 2021 |
| Land Xchange Ltd | Real estate | 2021 |
| Landsource Corp LLP | | 2014 |
| Landstar UK Limited | Real estate | 1994 |
| Landway Services Limited | Professional & scientific | 1997 |
| Lane Building Services Limited | Construction | 2014 |
| Langbourne Ltd | Professional & scientific | 2016 |
| Language Therapy Limited | Education | 2002 |
| Larchwood LLP | | 2007 |
| Lardercraft Limited | Hospitality | 2013 |
| Lasa Investment UK Ltd | Real estate | 2025 |
| Laser Vision Care Holdings Ltd | Financial services | 2023 |