| Kelsey Park Limited | Financial services | 2018 |
| Kemco Company Services Ltd | Professional & scientific | 2016 |
| Kemp Developements Ltd | Real estate | 2025 |
| Kempt Commerce UK Ltd | Wholesale & retail | 2023 |
| Kemsing Fisheries Limited | Hospitality | 2025 |
| Kemsing News Limited | Wholesale & retail | 2016 |
| Kendle Adams Motorsport Limited | Wholesale & retail | 2009 |
| Kenmare Ardee Ltd | Hospitality | 2026 |
| Kenmare Consulting Services Ltd | Information & communication | 2024 |
| Kennedy Cater Ltd | Professional & scientific | 2006 |
| Kennett Homes Ltd | Construction | 2025 |
| Kenrose Business Solutions Ltd | Administrative & support | 2023 |
| Kensington Shorre Limited | Other services | 2015 |
| Kent Botox Ltd | Health & social care | 2016 |
| Kent Canoes Limited | Wholesale & retail | 2016 |
| Kent Conferences Ltd. | Professional & scientific | 2006 |
| Kent Counselling for Schools Limited | Education | 2018 |
| Kent Craft Supplies Limited | Wholesale & retail | 2022 |
| Kent Crane Hire Limited | Administrative & support | 2024 |
| Kent Downs Dairy Limited | Agriculture & fishing | 2020 |
| Kent Ductwork Limited | Construction | 1994 |
| Kent Home Help Ltd | Administrative & support | 2024 |
| Kent House Holdings Limited | Professional & scientific | 2017 |
| Kent House Homes Limited | Construction | 2020 |
| Kent Lime Plastering Ltd | Construction | 2019 |
| Kent Mercantile Holdings Limited | Financial services | 2025 |
| Kent Padel Limited | Arts & recreation | 2025 |
| Kent Pest Management Limited | Administrative & support | 2021 |
| Kent Property Centre Limited | Real estate | 2013 |
| Kent Registration Plates Ltd | Administrative & support | 2024 |
| Kent Roofing Contractors Ltd | Construction | 2026 |
| Kent Steam Shipping Company Ltd | Transport & logistics | 2019 |
| Kent Trading Services Limited | Other services | 2024 |
| Kent Wood Flooring Limited | Construction | 2014 |
| Kentavr (UK) Limited | Agriculture & fishing | 1997 |
| Kentinental Engineering Limited | Manufacturing | 1987 |
| Kentish Let’S Ltd | Real estate | 2025 |
| Kentishuk Limited | Wholesale & retail | 2022 |
| Keoko Limited | Administrative & support | 2007 |
| Keoma Advisors Limited | Professional & scientific | 2023 |
| Keoma Energy Ltd | Energy | 2025 |
| Keoma EV Hubs Ltd | Transport & logistics | 2025 |
| Kepler Search Limited | Administrative & support | 2012 |
| Kernel Strategy Ltd | Professional & scientific | 2015 |
| Keskidee Marketing Limited | Professional & scientific | 2018 |
| Keston Consultants Limited | Administrative & support | 1978 |
| Kestrel Ground Management Ltd | Financial services | 2019 |
| Kestrel Mechanical Services Limited | Construction | 1984 |
| Kestrel Studios Ltd | Information & communication | 2026 |
| Kestrel Ventures Ltd | Information & communication | 2012 |
| Kevington Hall Limited | Wholesale & retail | 2009 |
| Kexo Trading UK Ltd | Wholesale & retail | 2018 |
| Key Digital UK Distribution Ltd | Wholesale & retail | 2019 |
| Key Marketing Services Limited | Manufacturing | 2001 |
| Keycode Projects Limited | Information & communication | 1992 |
| Keyshire Property Investments Ltd | Real estate | 2023 |
| Keytech Holdings Ltd | Professional & scientific | 2022 |
| KGK Investments Limited | Financial services | 2020 |
| KGM Finance Limited | Professional & scientific | 2014 |
| KGT (UK) Ltd | Administrative & support | 2009 |
| Khaki Films Limited | Information & communication | 2007 |
| Khalf Ltd | Wholesale & retail | 2024 |
| Kheyadiya & DEV Ltd | Hospitality | 2021 |
| Ki-Coo’S Kitchen Ltd | Hospitality | 2024 |
| Kiasu Drainage Limited | Water & waste | 2023 |
| Kiasu Fire & Security Limited | Administrative & support | 2023 |
| Kiasu Workforce Limited | Real estate | 2014 |
| KIB Services Limited | Professional & scientific | 2021 |
| Kiba Research Limited | Professional & scientific | 2024 |
| KIC Services Ltd | Other services | 2017 |
| Kidsplay & Learn Preschool Ltd | Education | 2022 |
| Kiefer Properties Ltd | Real estate | 2018 |
| Kiera's KEG Ltd | Hospitality | 2019 |
| Killmurray Limited | Households | 2021 |
| KIN MOT Pics Limited | Information & communication | 2017 |
| King Media Group Ltd | Professional & scientific | 2019 |
| KING4 Limited | Administrative & support | 2021 |
| Kings (Borough Green) Limited | Real estate | 2010 |
| Kings (Meopham) Limited | Real estate | 2010 |
| Kings (Sevenoaks) Limited | Real estate | 2010 |
| Kings (Swanley) Limited | Real estate | 2010 |
| Kings Holdings Limited | Real estate | 2019 |
| Kings Trustees Ltd | Real estate | 2019 |
| Kingscote Residents Management Company Limited | Households | 2003 |
| Kingsway Building Materials Limited | Manufacturing | 1978 |
| Kingswood Media Ltd | Information & communication | 2006 |
| Kingswood Tech Events Ltd | Information & communication | 2019 |
| Kippington House Management Limited | Households | 1983 |
| Kippington Ltd | Real estate | 2015 |
| Kippington Roads (Sevenoaks) Limited | Real estate | 1936 |
| Kirami Ltd | Construction | 2018 |
| Kirkcourt Residents Association Limited | Households | 1964 |
| Kirkmoore Television Limited | Information & communication | 2022 |
| Kirkwood Asset Management Ltd | Professional & scientific | 2018 |
| Kirkwood Wealth Management Ltd | Professional & scientific | 2018 |
| KIT for Kids Global Limited | Professional & scientific | 2015 |
| Kitalpha Limited | Information & communication | 2022 |
| KJG Media Limited | Information & communication | 2014 |
| Klassklinic AI Ltd | Information & communication | 2025 |
| KMC Waste Transfer Station Ltd | Water & waste | 2025 |