| JP Kent Ltd | Professional & scientific | 2019 |
| Jpea Consulting Limited | Construction | 2026 |
| JPM Inc UK Limited | Manufacturing | 2026 |
| JRC Haulage Limited | Transport & logistics | 2016 |
| JS Environmental Services Limited | Professional & scientific | 2016 |
| Jsi-Technology Ltd | Information & communication | 2026 |
| JSR Installations Limited | Construction | 2015 |
| Jsrvv Ltd | Health & social care | 2021 |
| JSS Convenience Store Ltd | Wholesale & retail | 2023 |
| JTG Medical Ltd | Health & social care | 2023 |
| JTH Building Services Limited | Construction | 2025 |
| Julie London Ltd | Wholesale & retail | 2021 |
| Juniper & ME Ltd | Wholesale & retail | 2022 |
| Juniper Lake Ventures LLP | | 2021 |
| Junruixing Import and Export Trading Co., Limited | Manufacturing | 2025 |
| Jusin Services Ltd | Information & communication | 2025 |
| Just Insight Limited | Information & communication | 2014 |
| Just Pizza Kent Ltd | Hospitality | 2021 |
| Justin Cross Radiology Ltd | Health & social care | 2020 |
| JWR Consulting Services Limited | Information & communication | 2024 |
| JZ Sports Ltd | Arts & recreation | 2017 |
| K & R Decorators Limited | Construction | 2022 |
| K Bar Limited | Hospitality | 2017 |
| K D R Hastings Limited | Information & communication | 2007 |
| K Iyiola Assets Developments Ltd | Real estate | 2024 |
| K Iyiola Assets Ltd | Real estate | 2026 |
| K L H Executive Search Limited | Administrative & support | 2003 |
| K&M Holdings (Kent) Ltd | Financial services | 2025 |
| K-Air Ltd | Construction | 2026 |
| K. Glass Creditors Partnership | | 1999 |
| K.P.L. Investments Limited | Financial services | 1985 |
| K.Saunders Services Limited | Health & social care | 2019 |
| K9X Ltd | Other services | 2024 |
| Kacey Business Solutions Ltd | Information & communication | 2017 |
| Kaebou Ltd | Wholesale & retail | 2020 |
| Kali Films Limited | Information & communication | 2000 |
| Kallis Medical Consulting Ltd | Health & social care | 2024 |
| Kalm Property Group Ltd | Real estate | 2024 |
| Kalveer Ltd | Real estate | 2026 |
| Kamakhya Foods Limited | Wholesale & retail | 2025 |
| Kamel Surgical Ltd | Health & social care | 2026 |
| Kamukea Limited | Professional & scientific | 2017 |
| Kanapathyraja Ltd | Health & social care | 2023 |
| Kane Lifestyle Ltd | Manufacturing | 2026 |
| Kanso Homes Ltd | Construction | 2025 |
| Kaorium Limited | Information & communication | 2024 |
| KAT Life Films & Consulting (UK) Limited | Professional & scientific | 2020 |
| Katchna UK Ltd | Wholesale & retail | 2019 |
| Kate Maclaran Ltd | Health & social care | 2024 |
| Katherine Holland Garden Supplies Ltd | Wholesale & retail | 2023 |
| Katherine Ingram Legal Services Limited | Professional & scientific | 2020 |
| Kathmandu Valley (Sevenoaks) Limited | Hospitality | 2012 |
| Kathmandu Valley (Tonbridge) Limited | Hospitality | 2018 |
| Katsimpson Consulting Limited | Information & communication | 2022 |
| Katz-Crowther Estates Ltd | Real estate | 2022 |
| Kaucha Property Ltd | Real estate | 2026 |
| Kavya Consulting Limited | Transport & logistics | 2011 |
| Kaycohouses Ltd | Real estate | 2021 |
| KB Consulting Ltd | Information & communication | 2020 |
| KB Info Limited | Information & communication | 2011 |
| Kbjr Medical Services Ltd | Health & social care | 2023 |
| KCM Building Services Limited | Construction | 2024 |
| Kean Financial Ltd | Real estate | 2016 |
| Keeler Consulting Ltd | Information & communication | 2025 |
| Keeping Landscape Services Limited | Administrative & support | 2024 |
| Keeymona Wellness Care Ltd | Health & social care | 2022 |
| KEG Productions Ltd. | Extraterritorial | 2016 |
| Keith Bassi Ltd | Other services | 2013 |
| Keith Price Shipping Ltd | Wholesale & retail | 2016 |
| Kejalot Limited | Real estate | 2015 |
| Kela Financial Limited | Financial services | 2024 |
| Kelada Limited | Health & social care | 2026 |
| Kempvestment Ltd | Real estate | 2020 |
| KEN Ballard Limited | Manufacturing | 1985 |
| Kendal and Partners Limited | Professional & scientific | 2014 |
| Kendal Collective Limited | Financial services | 2023 |
| Kennards Investment Ltd | Financial services | 2017 |
| Kensington Worcester Limited | Information & communication | 2020 |
| Kent & Sussex Dog Training Ltd | Agriculture & fishing | 2024 |
| Kent & Sussex Memorials Limited | Other services | 2014 |
| Kent & Sussex Radiology Group LLP | | 2019 |
| Kent and Sussex Earthworks Ltd | Administrative & support | 2024 |
| Kent and Sussex Financial Group Limited | Financial services | 2002 |
| Kent and Sussex Property Finders Limited | Real estate | 2020 |
| Kent Asphalt Ltd | Construction | 2012 |
| Kent Assured Roofing Ltd | Construction | 2015 |
| Kent Beekeepers Association | Education | 1929 |
| Kent Bespoke Carpentry Ltd | Manufacturing | 2026 |
| Kent Car Exchange Ltd | Wholesale & retail | 2023 |
| Kent Castle Estate Ltd | Real estate | 2024 |
| Kent Cornwall Property Holdings Limited | Real estate | 2026 |
| Kent County Appliance Services Ltd | Extraterritorial | 2021 |
| Kent County Pest Control Ltd | Administrative & support | 2024 |
| Kent Electrical Home Ltd | Construction | 2026 |
| Kent Freehold Holdings Ltd | Real estate | 2023 |
| Kent Grassland Services Limited | Administrative & support | 2021 |
| Kent Home Cinema Limited | Information & communication | 2020 |
| Kent Implant Services Ltd | Health & social care | 2023 |
| Kent Kids Party Organisers Ltd | Administrative & support | 2023 |
| Kent Kraft Developments Limited | Construction | 2016 |