| Karen Beck Consulting Ltd | Information & communication | 2016 |
| Karen Bengall Photography Ltd. | Other services | 2016 |
| Karen Cooksley Consultancy Limited | Professional & scientific | 2021 |
| Karen Mcclure Garden Design Limited | Professional & scientific | 2019 |
| Karen Newby Limited | Professional & scientific | 2013 |
| Karis Solicitors Limited | Professional & scientific | 2005 |
| Karvelon Limited | Wholesale & retail | 2026 |
| Katherine Sheen Ltd. | Professional & scientific | 2015 |
| Katie Ellwood-Smith Consulting Ltd | Professional & scientific | 2026 |
| Katy Hogben LLP | | 2012 |
| Kaycero Limited | Information & communication | 2010 |
| Kaythe Ltd | Information & communication | 2026 |
| KB PMO Ltd | Professional & scientific | 2022 |
| Kb's Taste Ltd | Manufacturing | 2015 |
| KBF Industries Limited | Professional & scientific | 2017 |
| KCG Services Limited | Manufacturing | 1990 |
| KD Shutters & Blinds Ltd | Construction | 2021 |
| Kd-Haus UK Limited | Construction | 1998 |
| Keas Trading Limited | Wholesale & retail | 2013 |
| Kecila Limited | Administrative & support | 2021 |
| Keeos Limited | Professional & scientific | 2019 |
| Keepli Ltd | Wholesale & retail | 2026 |
| Kellsboro Advisory Limited | Professional & scientific | 2014 |
| Kelly Anna Limited | Professional & scientific | 2018 |
| Kelly Cycles Limited | Wholesale & retail | 2016 |
| Kelly M Services Ltd | Administrative & support | 2025 |
| KEM Investments Ltd | Professional & scientific | 2011 |
| KEM Management Limited | Administrative & support | 1998 |
| KEM Pumps Ltd | Construction | 2016 |
| Kempton Equestrian Ltd | Wholesale & retail | 2024 |
| KEN Lamacraft Marketing Limited | Wholesale & retail | 1995 |
| Kendel Door and Property Services Ltd | Other services | 2010 |
| Kennard Ruthven Limited | Arts & recreation | 2007 |
| Kent & Surrey Electrical Limited | Construction | 2021 |
| Kent & Sussex Climbing Limited | Arts & recreation | 2010 |
| Kent & Sussex Loft Coversions Limited | Construction | 2010 |
| Kent & Sussex Neurology Limited | Health & social care | 2009 |
| Kent & Sussex Self Storage Ltd | Information & communication | 2023 |
| Kent and Sussex Canine Hydrotherapy Limited | Professional & scientific | 2024 |
| Kent and Sussex Joinery Ltd | Manufacturing | 2021 |
| Kent and Sussex Rider Training Limited | Education | 1994 |
| Kent College (Pembury) Enterprises Limited | Administrative & support | 1992 |
| Kent Groundworks and Construction Ltd | Construction | 2023 |
| Kent House Partnership Limited | Construction | 2011 |
| Kent House Residents Management Company Limited | Households | 2006 |
| Kent Kerala Groceries Ltd | Wholesale & retail | 2021 |
| Kent Kids Health Limited | Health & social care | 2021 |
| Kent Sparkle Clean Limited | Administrative & support | 2025 |
| Kent Towing Solutions Ltd | Wholesale & retail | 2023 |
| Kent Tutors Limited | Other services | 2016 |
| Kent Wines Ltd | Wholesale & retail | 2021 |
| Kent&Sussexcars Ltd | Wholesale & retail | 2023 |
| Kentec Mail & Courier Service Ltd | Transport & logistics | 2006 |
| Kentech Controls Ltd | Professional & scientific | 2025 |
| Kentish Developments Limited | Real estate | 1961 |
| Kentish Mansions Residents Association Limited | Households | 2002 |
| Keogh Caisley Limited | Professional & scientific | 2012 |
| Kerlon Limited | Hospitality | 1982 |
| Kerri Leigh Sibson Ltd | Professional & scientific | 2023 |
| KES Hospitality Group Limited | Hospitality | 2024 |
| Kestrel Carpentry & Construction Limited | Construction | 2024 |
| Keton Limited | Manufacturing | 1996 |
| Kett's Kitchen Limited | Hospitality | 2014 |
| Key & Quill Ltd | Information & communication | 2018 |
| KEY4JOY Ltd | Wholesale & retail | 2024 |
| Keycentric Ltd | Information & communication | 2024 |
| Keystone Accounting Solutions Ltd | Professional & scientific | 2024 |
| Keystone General Practice Limited | Health & social care | 2026 |
| Keystone Research and Purchasing Ltd | Professional & scientific | 2019 |
| Kezzas Creations Ltd | Wholesale & retail | 2026 |
| Kggeo Ltd | Professional & scientific | 2024 |
| KH Healthcare Services Ltd | Health & social care | 2026 |
| Khan Family Property Limited | Health & social care | 2022 |
| KHR Cars Ltd | Transport & logistics | 2020 |
| Khula Limited | Information & communication | 2025 |
| Kick ASS Films Limited | Information & communication | 2009 |
| Kick IT Solutions Limited | Information & communication | 2007 |
| Kick-Start Publishing Limited | Information & communication | 1999 |
| Kickoff Football Leagues Ltd | Arts & recreation | 2024 |
| Kickoff Proposals Ltd | Administrative & support | 2025 |
| Kidman's Limited | Wholesale & retail | 2014 |
| KIE Lettings Ltd | Real estate | 2024 |
| KIE Nundinae Ltd | Construction | 2023 |
| Kienstar Limited | Professional & scientific | 2024 |
| Kieran Shalloo Design Ltd | Professional & scientific | 2019 |
| Killygarvan Homes Ltd | Real estate | 2020 |
| Kiln Bank Freehold Limited | Households | 2022 |
| Kilnrow Construction Ltd | Construction | 2019 |
| Kin-Sail Ltd | Information & communication | 2023 |
| Kindcare Transit Limited | Transport & logistics | 2024 |
| Kindon Mckenzie Consulting Ltd | Professional & scientific | 2024 |
| Kinekri Limited | Information & communication | 2024 |
| King's Cairn Investments Limited | Financial services | 2019 |
| Kingfisher Court Wimbledon Freehold Ltd | Households | 2022 |
| Kinglen Limited | Real estate | 1971 |
| Kings Court (Crowborough) Limited | Households | 1975 |
| Kings Court Freeholders Company Limited | Households | 2002 |
| Kingsalton Limited | Real estate | 1965 |
| Kingsberg Ltd | Wholesale & retail | 2020 |
| Kingston Cosmetics Limited | Health & social care | 2019 |