| Karen Mellor Design Ltd | Professional & scientific | 2011 |
| Karina Aloupi Limited | Administrative & support | 2012 |
| Karl Botha Interiors Ltd | Construction | 2018 |
| Karlogistics Ltd | Transport & logistics | 2025 |
| Karmanor Solutions Ltd | Professional & scientific | 2017 |
| Karniha Limited | Wholesale & retail | 2019 |
| Karoo Sky Ltd | Information & communication | 2025 |
| Karsandi Properties Limited | Real estate | 2020 |
| Karsty Ltd | Transport & logistics | 2020 |
| KAS Archaeological Services Ltd | Professional & scientific | 2024 |
| Kash Futures Ltd | Real estate | 2022 |
| Kashaya Group Ltd | Wholesale & retail | 2020 |
| Kassurerance Limited | Health & social care | 2023 |
| Kastle Squared Limited | Construction | 2012 |
| Kate Martin Digital Ltd | Information & communication | 2021 |
| Kate's Swimming Ltd | Education | 2014 |
| Katerina Accounts & Bookkeeping Limited | Professional & scientific | 2006 |
| Kathmandu Properties Limited | Real estate | 2020 |
| Kathmandu RAW Gold Wholesale Limited | Wholesale & retail | 2023 |
| KATI-12 Ltd | Transport & logistics | 2026 |
| Katies Fizz Shack Ltd | Wholesale & retail | 2020 |
| Kaura Club Ltd | Wholesale & retail | 2026 |
| KAV Build Ltd | Construction | 2025 |
| Kavanagh's Accounting Services Limited | Professional & scientific | 2016 |
| Kavari Consultancy Limited | Professional & scientific | 2019 |
| Kaviar Carpentry Ltd | Construction | 2021 |
| Kaya Services Ltd | Hospitality | 2026 |
| Kayser Logistik Ltd | Transport & logistics | 2017 |
| Kazala Ltd | Transport & logistics | 2020 |
| KB Ecology Ltd | Professional & scientific | 2011 |
| KC Elevators Ltd | Construction | 2016 |
| KC Hospitality Group Ltd | Hospitality | 2019 |
| KC Marketing & IT Consultancy Ltd | Professional & scientific | 2018 |
| KCC Initial LP 1 Limited | Financial services | 2015 |
| KCI Smarthomes Limited | Information & communication | 2020 |
| KCN Corporation Limited | Real estate | 2023 |
| KCN Group Ltd | Financial services | 2023 |
| KCT Timber and Fencing Supplies Ltd | Wholesale & retail | 2022 |
| KD Electrical Security Solutions Ltd | Administrative & support | 2025 |
| KD Works (UK) Ltd | Construction | 2024 |
| KDD Property Ltd | Real estate | 2022 |
| Kddl Ltd | Transport & logistics | 2023 |
| Kdgd Logistics Ltd | Transport & logistics | 2024 |
| KDS Watches Ltd | Wholesale & retail | 2023 |
| KE6 2 Bar Ltd | Hospitality | 2023 |
| Kearsney Property Services Limited | Real estate | 2019 |
| Keatsway Limited | Other services | 1993 |
| Keaveney Contractors Limited | Construction | 2006 |
| Keaveney Plant Hire Limited | Financial services | 2002 |
| Kebab Fish Knight Ltd | Hospitality | 2019 |
| Keeb Property Solutions Limited | Real estate | 2025 |
| Keefields Ltd | Administrative & support | 2018 |
| Keep Account Limited | Professional & scientific | 2002 |
| Keepers Nursery Limited | Agriculture & fishing | 2023 |
| KEF Consulting Limited | Professional & scientific | 2018 |
| Keidas Ltd | Transport & logistics | 2019 |
| Keir Simons Limited | Administrative & support | 2017 |
| Kella Technologies Ltd | Manufacturing | 2017 |
| Kellow & Carter Ltd | Construction | 2023 |
| Kelly & Associates Services Ltd | Construction | 2025 |
| Kelly Automation & Controls Limited | Professional & scientific | 2012 |
| Kelly Property Solutions Ltd | Households | 2025 |
| Kelony Limited | Health & social care | 2026 |
| Kelsey Consultancy Limited | Information & communication | 2011 |
| Kelsey Media Limited | Information & communication | 2006 |
| Kelsey Publishing Limited | Information & communication | 1989 |
| Kemet Developments Limited | Professional & scientific | 1968 |
| Kemet International Limited | Manufacturing | 1938 |
| Kemet Services Limited | Professional & scientific | 1967 |
| Kemps Landscaping Ltd | Administrative & support | 2023 |
| Kemsley Arboricultural Consulting Limited | Professional & scientific | 2025 |
| Kendrick PR Consulting Ltd | Professional & scientific | 2015 |
| Kenmart Printers Engineers Limited | Administrative & support | 2014 |
| Kennedy's Publications Limited | Information & communication | 1974 |
| Kennington Ashford Limited | Financial services | 2012 |
| Kennington Green Management Limited | Households | 2001 |
| Kensko Grills Limited | Hospitality | 2021 |
| Kensko Properties Limited | Real estate | 2022 |
| Kent & Sussex ENT LLP | | 2024 |
| Kent Accounting Services Ltd | Professional & scientific | 2023 |
| Kent Acting Studio Ltd | Education | 2023 |
| Kent Aggregates Limited | Real estate | 1963 |
| Kent AI Limited | Education | 2025 |
| Kent Air Conditioning Services Ltd | Construction | 2023 |
| Kent and Essex Properties Ltd | Real estate | 2023 |
| Kent and Sussex Antiques Limited | Wholesale & retail | 2023 |
| Kent and Sussex Investments Ltd | Real estate | 2010 |
| Kent Arts and Wellbeing C.I.C. | Health & social care | 2017 |
| Kent Automotive Limited | Wholesale & retail | 2011 |
| Kent Beauty Training Ltd | Education | 2024 |
| Kent Bespoke Shutters Ltd | Construction | 2020 |
| Kent Bike Breakers Limited | Wholesale & retail | 1990 |
| Kent BM Ltd | Wholesale & retail | 2024 |
| Kent Broadway News Ltd | Wholesale & retail | 2010 |
| Kent Build and Improve Ltd | Construction | 2025 |
| Kent Building Contractors Ltd | Construction | 2014 |
| Kent Business College Ltd | Real estate | 2016 |
| Kent Business Support Group CIC | Real estate | 2024 |
| Kent Capital (Property) Limited | Real estate | 2016 |
| Kent Catholic Schools' Partnership | Education | 2012 |