| Kacto Services Ltd | Professional & scientific | 2020 |
| Kadmium Ltd | Administrative & support | 2014 |
| Kaizen Accommodation Ltd | Real estate | 2025 |
| KAM Consultancy London Ltd | Professional & scientific | 2021 |
| KAM London Trading Ltd | Wholesale & retail | 2021 |
| Kamaly Enterprises Ltd | Manufacturing | 2018 |
| Kamaly Estates Ltd | Real estate | 2020 |
| Kamanika Mohottige Fine Art Limited | Education | 2025 |
| Kamiloss Ltd | Transport & logistics | 2025 |
| Kamsavy PVT Ltd | Wholesale & retail | 2022 |
| Kan-Doo Timber Supplies Limited | Wholesale & retail | 1991 |
| Kashi Kalika Kala Ltd | Manufacturing | 2026 |
| Katie Mccrum Studio Ltd | Administrative & support | 2004 |
| Kaviyan Private Limited | Real estate | 2026 |
| Kavoda Ltd | Wholesale & retail | 2023 |
| Kazderya Limited | Hospitality | 2024 |
| KDG Architects Limited | Professional & scientific | 2025 |
| Keeper's Cottages (Deal) Limited | Real estate | 2013 |
| Kema Group Ltd | Financial services | 2025 |
| Kennacc Construction Ltd | Real estate | 2007 |
| Kennard & Sons Limited | Real estate | 1923 |
| Kent Build Solutions Ltd | Construction | 2024 |
| Kent Building Compliance Ltd | Professional & scientific | 2021 |
| Kent Building Surveys Ltd | Professional & scientific | 2023 |
| Kent Cancer Trust | Education | 2003 |
| Kent Cleans Limited | Administrative & support | 2026 |
| Kent Coast Accounts Ltd | Professional & scientific | 2008 |
| Kent Cornerstone Construction Ltd | Construction | 2023 |
| Kent Country Construction Ltd | Construction | 2024 |
| Kent County 24/7 Heating, Plumbing & GAS Engineers Ltd | Construction | 2013 |
| Kent County Contractors Limited | Construction | 2009 |
| Kent Decorating Services Limited | Construction | 2012 |
| Kent Design Studio Limited | Professional & scientific | 2014 |
| Kent Domiciliary Care Limited | Health & social care | 2014 |
| Kent Electrical Systems Ltd | Administrative & support | 2025 |
| Kent Elite Cleaning Services Ltd | Administrative & support | 2025 |
| Kent Film Foundation Limited | Education | 2010 |
| Kent Fire & Risk Ltd | Public administration | 2025 |
| Kent Fresh Limited | Hospitality | 2020 |
| Kent Gaskets Limited | Manufacturing | 2013 |
| Kent Home Renovation Group Ltd | Households | 2026 |
| Kent Hosting Ltd | Information & communication | 2016 |
| Kent Offshore Limited | Professional & scientific | 2018 |
| Kent Planning Consultancy Ltd | Professional & scientific | 2020 |
| Kent Property & Land Consultants Ltd | Professional & scientific | 2013 |
| Kent Thanet Tamil Association | Other services | 2016 |
| Kent Truck Wash Ltd | Wholesale & retail | 2024 |
| Kentech Electronic Production Limited | Manufacturing | 2001 |
| Kentishevents Ltd | Professional & scientific | 2025 |
| Kess Recruitment Limited | Administrative & support | 2023 |
| Key Arts Limited | Professional & scientific | 2007 |
| Key Construction Services Ltd | Construction | 2020 |
| Khickster Camps and Pools for Schools Ltd | Education | 2021 |
| Kick Homes Ltd | Real estate | 2020 |
| Kick Split 1 Limited | Real estate | 2023 |
| Kidd Lane Ltd | Other services | 2024 |
| Kids Play Centre Ramsgate Ltd | Arts & recreation | 2022 |
| Killertone Records Ltd | Administrative & support | 2020 |
| Kimber Estates Limited | Extraterritorial | 2021 |
| Kimber Woodward Limited | Real estate | 2009 |
| Kimbers Marketing Ltd | Wholesale & retail | 2023 |
| Kinah Limited | Health & social care | 2021 |
| Kinch & Woolford Decorators Ltd | Construction | 2021 |
| Kingdom Construction Sealants & Maintenance Limited | Construction | 2017 |
| Kingsman Holdings Ltd | Wholesale & retail | 2025 |
| Kingswood Joinery and Building Limited | Construction | 1993 |
| Kinzler Surgical Solutions Ltd | Wholesale & retail | 2024 |
| Kitchen Ventilation Services Ltd | Manufacturing | 2017 |
| Kitschen Sync Productions Limited | Extraterritorial | 2001 |
| KIX Arena Ltd | Arts & recreation | 2026 |
| KK Estates Kent Ltd | Real estate | 2022 |
| KLP Northwood JV Ltd | Real estate | 2025 |
| KLS Permanent Makeup Ltd | Other services | 2025 |
| KMG Accounting Ltd | Professional & scientific | 2014 |
| KMR Creative Limited | Professional & scientific | 2016 |
| Knea Ltd | Wholesale & retail | 2025 |
| KNF Property Ltd | Real estate | 2018 |
| Knight Construction and Roofing Ltd | Construction | 2023 |
| Knight's Plumbing & Heating (Kent) Ltd | Construction | 2017 |
| Knights Court Freehold Ltd | Households | 2022 |
| Knights Lodge Construction Ltd | Construction | 2016 |
| Knights Lodge Hospitality Ltd | Financial services | 2018 |
| Knights Lodge Properties Ltd | Real estate | 2016 |
| Knowledge Transfer Interim Solutions (Ktis) Limited | Administrative & support | 2019 |
| Knowlton Project Support Limited | Professional & scientific | 2006 |
| Komorebi Kitchen Ltd | Hospitality | 2026 |
| Kompaniet Ltd | Professional & scientific | 2023 |
| Koster Group Limited | Water & waste | 2026 |
| KRJ Creations Ltd | Arts & recreation | 2024 |
| KRS Ramdevi Ltd | Real estate | 2020 |
| Kubagrela Limited | Wholesale & retail | 2016 |
| Kurt&Darioglu Ltd | Hospitality | 2025 |
| Kwl.Tom Ltd. | Mining & quarrying | 2019 |
| L & H Homes Ltd | Real estate | 2020 |
| L & W Property Maintenance Limited | Construction | 2025 |
| L'Absurde Ltd | Wholesale & retail | 2023 |
| L.C Business Management Ltd | Construction | 2017 |
| LA Zanet Ltd | Hospitality | 2025 |
| La-Properties (Kent) Limited | Real estate | 2019 |
| Lab-Tools Limited | Professional & scientific | 2004 |