| JS Drains Ltd | Water & waste | 2024 |
| JS Smart Care Ltd | Health & social care | 2015 |
| JSC Projects Ltd | Construction | 2020 |
| JTH Wastewater Services Ltd | Professional & scientific | 2026 |
| Jubeller Limited | Administrative & support | 2023 |
| Julian Court (Cliftonville) Management Limited | Households | 1977 |
| Just Jacks Salon Ltd | Other services | 2019 |
| Just Jane Construction and Maintenance Limited | Construction | 2021 |
| Just Jane Limited | Wholesale & retail | 2016 |
| JW Holdings (Thanet) Limited | Professional & scientific | 2017 |
| JWG Marketing Ltd | Professional & scientific | 2025 |
| K & a Properties (Kent) Ltd | Real estate | 2026 |
| K & H Properties Kent Ltd | Real estate | 2025 |
| K & J Marine Limited | Other services | 2017 |
| K 1 Tyres Dover Ltd | Manufacturing | 2022 |
| K a Baughan Welding Limited | Manufacturing | 2025 |
| K&K Trans M Ltd | Transport & logistics | 2018 |
| K.C. UK International Ltd | Wholesale & retail | 2019 |
| K2 Working With YOU for Success and Solutions. Ltd | Administrative & support | 2024 |
| Kairos 85 Ltd | Real estate | 2020 |
| Kaiyou Digital Ltd | Information & communication | 2024 |
| Kaka Kent Ltd | Other services | 2026 |
| Kalemi Property Ltd | Households | 2022 |
| Kalli Jayne Aesthetics Limited | Other services | 2025 |
| Kampers and Classics Ltd | Wholesale & retail | 2019 |
| Kander Care Community Limited | Health & social care | 2013 |
| Kareem & Sons Limited | Wholesale & retail | 2026 |
| Karm Kitchen Ltd | Hospitality | 2025 |
| Karnworks Ltd | Information & communication | 2026 |
| KAS Community Publishing Limited | Information & communication | 2022 |
| Katherine Morris Ltd | Information & communication | 2007 |
| Katie Barber Ltd | Professional & scientific | 2018 |
| Katie White Consulting Limited | Professional & scientific | 2020 |
| Kaval Alaturka Ltd | Hospitality | 2026 |
| Kawa Margate Ltd | Wholesale & retail | 2020 |
| KBM Estate Ltd | Real estate | 2021 |
| Kclear Consulting Ltd | Administrative & support | 2021 |
| Kean Proudfoot Ltd | Professional & scientific | 2022 |
| Keda Holdings Limited | Real estate | 2025 |
| Keep Going Limited | Health & social care | 2020 |
| Kelly Constructs Ltd | Construction | 2026 |
| Kempability Limited | Administrative & support | 2008 |
| Kemps Motoring School Ltd | Education | 2025 |
| Kent Apex Decorators Ltd | Construction | 2023 |
| Kent Best Mobile Car Wash Ltd | Wholesale & retail | 2026 |
| Kent Car Media Ltd | Information & communication | 2022 |
| Kent Coastal Property Ltd | Real estate | 2024 |
| Kent Coastal Supported Living Ltd | Health & social care | 2025 |
| Kent Commercial Cleaning Ltd | Administrative & support | 2024 |
| Kent Commercial Parts Limited | Wholesale & retail | 2016 |
| Kent Community Services Ltd | Transport & logistics | 2019 |
| Kent Construction (UK) Limited | Construction | 2013 |
| Kent Construction Consultants Limited | Construction | 2020 |
| Kent Holiday Homes Ltd | Hospitality | 2017 |
| Kent Investment Group Limited | Real estate | 2021 |
| Kent Laser Cleaning Limited | Administrative & support | 2026 |
| Kent Management Services Ltd | Hospitality | 2016 |
| Kent Medical Education Ltd | Education | 2024 |
| Kent Scuba Limited | Wholesale & retail | 2003 |
| Kent Telephones Ltd | Information & communication | 2001 |
| Kent Transport Solutions Limited | Transport & logistics | 2023 |
| Kent Volkswagen Limited | Wholesale & retail | 2009 |
| Kent Workwear Ltd | Wholesale & retail | 2024 |
| Kentish Oak Construction Limited | Construction | 2018 |
| Kentish School of English Ltd | Education | 2025 |
| Kenwins Limited | Wholesale & retail | 2011 |
| KF (Edridge Road) Ltd | Construction | 2025 |
| Khaila Essence Ltd | Wholesale & retail | 2025 |
| Khickster Events Ltd | Education | 2024 |
| Kidmans Court Residents Association Limited | Households | 1984 |
| Killacam Fight Nights Ltd | Arts & recreation | 2018 |
| Kinara Homes Ltd | Real estate | 2021 |
| Kings Mews (Margate Kent) Flat Management Company NO.1 Limited | Other services | 2007 |
| Kingsgate Technical Services Ltd | Administrative & support | 2022 |
| Kip's Canine Club Limited | Other services | 2025 |
| Kirstygallagher Ltd | Arts & recreation | 2021 |
| Kistikari Limited | Extraterritorial | 2024 |
| Kitchen Social & Cookery Club CIC | Education | 2020 |
| Kite and Wire Limited | Information & communication | 2023 |
| KKM Carpentry Ltd | Manufacturing | 2022 |
| Klezmargate Limited | Arts & recreation | 2024 |
| Klingenburg U.K. Ltd | Energy | 2013 |
| Kmeto K9 Training & Rehabilitation Ltd | Other services | 2025 |
| Kmgm Enterprises Limited | Wholesale & retail | 2015 |
| Knights Mortgage Services Limited | Administrative & support | 2015 |
| Knole Park Apartments Limited | Real estate | 2025 |
| Konrad Kotowski Limited | Construction | 2017 |
| Kopa (Capital Raise 1) Limited | Financial services | 2025 |
| Kopa Group Limited | Real estate | 2024 |
| Kopa Limited | Financial services | 2019 |
| Kovacs Colours Ltd | Construction | 2016 |
| Kovacs Food Limited | Hospitality | 2024 |
| KPG Bananas Limited | Wholesale & retail | 2016 |
| KSF Rentals Ltd | Real estate | 2023 |
| KTK Media Limited | Professional & scientific | 2025 |
| Kuslu Limited | Hospitality | 2016 |
| L & K Removals Ltd | Transport & logistics | 2020 |
| L Michael Properties Ltd | Real estate | 2018 |
| L P Property Rentals Ltd | Real estate | 2025 |
| L&A Drains and Services Ltd | Construction | 2025 |