| Jubilee Carriages Ltd | Hospitality | 2022 |
| Jubilee Court (Management Company) Ltd | Households | 2002 |
| Julie Foulcer Limited | Wholesale & retail | 2026 |
| Juniors at Holdens Limited | Hospitality | 2026 |
| Juniors Deli Ltd | Hospitality | 2024 |
| Just Caulfield Ltd | Professional & scientific | 2021 |
| Just Nature UK Limited | Health & social care | 2004 |
| Just One Property Development Limited | Construction | 2025 |
| JW Hussey Development Ltd | Construction | 2025 |
| JWF Travel Consultancy Ltd | Professional & scientific | 2020 |
| K & H Pet Services Limited | Other services | 2025 |
| K & S Services (South East) Ltd | Water & waste | 2003 |
| K Howes Property Ltd | Real estate | 2023 |
| K Tevfik Plumbing Ltd | Households | 2026 |
| K-Pave Ltd | Construction | 2015 |
| K4 Group Ltd | Wholesale & retail | 2015 |
| KAB Wave Limited | Transport & logistics | 2021 |
| KAD Property Enterprise Limited | Real estate | 2025 |
| Kafeine Ltd | Wholesale & retail | 2016 |
| Kanect Limited | Professional & scientific | 2021 |
| Kapers Animation Limited | Information & communication | 2016 |
| Karens Curtains & Interiors Limited | Wholesale & retail | 2015 |
| Karoshikula Ltd | Professional & scientific | 2019 |
| Kasper Limited | Health & social care | 1998 |
| Katy Bradbury Health Ltd | Health & social care | 2020 |
| KBM Autos Limited | Wholesale & retail | 2023 |
| Kcresearch Ltd | Professional & scientific | 2023 |
| Kdemedical Ltd | Health & social care | 2016 |
| Kearney Consulting Services Ltd | Professional & scientific | 2022 |
| Keates Carpentry and Building Limited | Construction | 2022 |
| Keates Developments (Kent) Limited | Real estate | 2025 |
| Keighley Investments Limited | Real estate | 2003 |
| Keith Maynard Ltd | Education | 2026 |
| Kelk Comms Limited | Information & communication | 2016 |
| Kembrey Industrial Management Company Limited | Households | 2006 |
| Kendal Meadow Ltd | Health & social care | 2001 |
| Kenhard Clark Ltd | Professional & scientific | 2021 |
| Kent Autism Assessments Limited | Health & social care | 2023 |
| Kent Business Solutions Limited | Professional & scientific | 2018 |
| Kent Car Buyers Limited | Wholesale & retail | 2026 |
| Kent Coast Automotive Ltd | Wholesale & retail | 2022 |
| Kent Coast Heating Limited | Construction | 2016 |
| Kent Coast Microcement Ltd | Construction | 2024 |
| Kent Coast Sonography Limited | Health & social care | 2010 |
| Kent Coastal Carpentry Ltd | Manufacturing | 2022 |
| Kent Cooling Systems Limited | Manufacturing | 2018 |
| Kent Cottage Holidays Ltd | Hospitality | 2018 |
| Kent Decking Supplies Limited | Wholesale & retail | 2019 |
| Kent Laptops Ltd | Other services | 2012 |
| Kent Materials Ltd | Wholesale & retail | 2019 |
| Kent Music Group Limited | Arts & recreation | 2021 |
| Kent Plastering and Rendering Ltd | Other services | 2018 |
| Kent Psychology Limited | Education | 2023 |
| Kent Recovery Tyres Ltd | Wholesale & retail | 2020 |
| Kent Render Systems Limited | Construction | 2026 |
| Kent Roller Derby Ltd. | Arts & recreation | 2018 |
| Kent School of Performing Arts Agency Ltd | Arts & recreation | 2016 |
| Kent Student Properties Ltd | Real estate | 2025 |
| Kent Survival Foods Ltd | Hospitality | 2025 |
| Kent Survival Ltd | Wholesale & retail | 2024 |
| Kent Training Kitchen Ltd | Hospitality | 2024 |
| Kent Wall Cleaning Services Ltd | Administrative & support | 2023 |
| Kent Waste Solutions Limited | Water & waste | 2013 |
| Kent's Maintenance Team Ltd | Construction | 2022 |
| Kentish Kitchens and Bathrooms Ltd | Construction | 2019 |
| Kenz Video Services Limited | Information & communication | 2025 |
| Keppel One Ltd | Professional & scientific | 2025 |
| Keren Cohen - Counselling Psychology Ltd | Health & social care | 2025 |
| Kerry Hales Coaching Limited | Administrative & support | 2022 |
| KEW Quality Consulting Ltd | Professional & scientific | 2013 |
| Kikirose Limited | Health & social care | 2021 |
| Kikubari Ltd | Real estate | 2025 |
| Kinetic Air Dryers Ltd | Professional & scientific | 2026 |
| Kingfisher C RTM Company Limited | Households | 2025 |
| Kings Hill (Area 27) Management Limited | Households | 2007 |
| Kingsgate Homes Limited | Real estate | 2013 |
| Kirby Property Investments Limited | Real estate | 2019 |
| Kirby Property Solutions Ltd | Real estate | 2020 |
| Kisani Menzi Limited | Extraterritorial | 2013 |
| Kisskadee Enterprises Ltd | Real estate | 2005 |
| Kisskadee Psychiatric Services Ltd | Health & social care | 2020 |
| Kitchen FXD Limited | Construction | 2023 |
| Kiwi Klean Ltd | Administrative & support | 2024 |
| Kldr Consulting Ltd | Professional & scientific | 2016 |
| KLE Apex Ltd | Construction | 2026 |
| KNF Media Limited | Information & communication | 2024 |
| Know Comment Limited | Extraterritorial | 2009 |
| Knowles & Godden Limited | Construction | 1983 |
| Kodo Vapes Ltd | Wholesale & retail | 2025 |
| Kona Build Ltd | Construction | 2022 |
| Konstruction (UK) Limited | Construction | 2014 |
| KSA Track Solutions Ltd | Real estate | 2023 |
| KT Construction (South East) Limited | Administrative & support | 2015 |
| Kucia Ltd | Other services | 2014 |
| KWB Estate Agents Ltd | Real estate | 2019 |
| L & I Airport Transfers Ltd | Transport & logistics | 2005 |
| L C Hayward Limited | Professional & scientific | 2022 |
| L J & J L Limited | Wholesale & retail | 2012 |
| L&M Fuels Limited | Wholesale & retail | 2022 |
| L&S GAS and Plumbing Ltd | Construction | 2025 |