| Joshua Tree Online Ltd | Hospitality | 2024 |
| Joshua Tree Properties Ltd | Financial services | 2026 |
| Jottier Ltd | Wholesale & retail | 2021 |
| Journeyman Electrics Limited | Construction | 2017 |
| JPS Plumbing Solutions Ltd | Construction | 2022 |
| JRT Group Ltd | Construction | 2023 |
| JSM Project Services Limited | Administrative & support | 2013 |
| JTC Consultants Kent Limited | Construction | 2011 |
| JTD Electrical Ltd | Construction | 2021 |
| Jubilee Training, Investigations & Consultancy Ltd | Administrative & support | 2017 |
| Juggernaut Holding Company Limited | Administrative & support | 2017 |
| Juggernaut Productions Limited | Information & communication | 2016 |
| Julimar Construction Ltd | Construction | 2017 |
| Just AVA Taxi Limited | Administrative & support | 2017 |
| Just Barbering Limited | Other services | 2024 |
| JVK Fabrication & Welding Limited | Manufacturing | 2012 |
| K & L Car Sales Ltd | Wholesale & retail | 2019 |
| K & L Motors (Merstham) Ltd | Wholesale & retail | 2022 |
| K-Active Personal Fitness & Well-Being Portal Ltd | Arts & recreation | 2018 |
| K.A.L Electrical Limited | Construction | 2014 |
| K.G. Norman Limited | Construction | 1998 |
| K42PRO Ltd | Wholesale & retail | 2024 |
| K9 Counselling Ltd | Other services | 2017 |
| Kakkar Food & Wine Ltd | Wholesale & retail | 2013 |
| Kalangara Limited | Wholesale & retail | 2025 |
| Kalyn Logistics Ltd. | Transport & logistics | 2011 |
| Kam-Mec Limited | Professional & scientific | 2017 |
| Kamberpeak Consulting Ltd | Professional & scientific | 2019 |
| Kanetix Ltd | Professional & scientific | 2017 |
| Kanju Ltd | Education | 2023 |
| KAP55 Ltd | Real estate | 2023 |
| Kapital Homes Limited | Real estate | 2005 |
| Kapow Media Productions Limited | Information & communication | 2010 |
| Kappa Maritime & Estates Limited | Transport & logistics | 1974 |
| Karl.E HR Consulting Limited | Professional & scientific | 2026 |
| Karthi Medical Ltd | Health & social care | 2022 |
| KAT Projects Ltd | Construction | 2012 |
| Katarzyna Wedzina Limited | Hospitality | 2016 |
| Kathryn Colas Academy Limited | Education | 2020 |
| Katy Bradbury & Co Ltd | Professional & scientific | 2021 |
| Kaumudi Limited | Real estate | 2024 |
| Kausation Limited | Wholesale & retail | 2020 |
| Kauta Ltd | Wholesale & retail | 2024 |
| Kazzicom Ltd | Information & communication | 2007 |
| KD Jones Heating Engineers Limited | Construction | 2008 |
| KDF Consultancy Ltd | Professional & scientific | 2020 |
| Kebab Heritage Ltd | Hospitality | 2022 |
| Keith Bastin and Sons Ltd | Construction | 2024 |
| Kelly & James Property Ltd | Real estate | 2020 |
| Keltic Engineering Group Limited | Professional & scientific | 2014 |
| Kenktech Limited | Information & communication | 2013 |
| Kenley Scaffolding Limited | Construction | 2025 |
| Kennels Farm Residents Limited | Households | 2010 |
| Kensho Judo Academy CIC | Education | 2025 |
| Keshavam Limited | Information & communication | 2023 |
| Keys Court Management Company Limited | Households | 2000 |
| KG Lifestyle & Interiors Ltd | Real estate | 2016 |
| KGE Properties Limited | Real estate | 2018 |
| KGO (Kent) Ltd | Professional & scientific | 2023 |
| KHD Construction Ltd | Construction | 2024 |
| Khin Family Services Ltd | Health & social care | 2020 |
| Khozi Ltd | Wholesale & retail | 2026 |
| Kibo Creative Ltd | Arts & recreation | 2019 |
| Killer B Films Ltd | Information & communication | 2025 |
| Kiln Brow Limited | Arts & recreation | 1983 |
| Kilns Medical Communications Ltd | Professional & scientific | 2022 |
| Kimberley London Limited | Wholesale & retail | 2013 |
| Kind Teas Ltd | Manufacturing | 2023 |
| Kindcare at Home Ltd | Health & social care | 2018 |
| Kindcare Health Hub Ltd | Wholesale & retail | 2024 |
| Kinetik Medical Devices Limited | Administrative & support | 2008 |
| Kinetik Technology Group Limited | Manufacturing | 2014 |
| Kinetik Vitality Limited | Administrative & support | 2009 |
| King Consultancy Global Limited | Wholesale & retail | 2025 |
| King Consultancy Limited | Information & communication | 2012 |
| King's Gate Christian Fellowship | Other services | 2009 |
| King,Kollakis & Company Limited | Transport & logistics | 1970 |
| Kings Cuts Ltd | Other services | 2021 |
| Kings Mill (South Nutfield) Management Limited | Households | 1987 |
| Kings Piece Ltd | Wholesale & retail | 2021 |
| Kingswood Insurance Brokers Ltd. | Financial services | 2004 |
| Kingswood Terriers Football Club CIC | Education | 2020 |
| Kiny Investments Limited | Real estate | 2001 |
| Kirika Limited | Information & communication | 2015 |
| Kisato Properties Ltd | Real estate | 2021 |
| Kitchen Effects Ltd | Administrative & support | 2018 |
| Kiwi's Kard's Limited | Wholesale & retail | 2023 |
| Klavier AI Ltd | Information & communication | 2026 |
| KM Care Limited | Health & social care | 2017 |
| Kmdy Limited | Education | 2017 |
| KMF Electric Heating and Plumbing Ltd | Construction | 2020 |
| KMG Health Partners Ltd | Professional & scientific | 2004 |
| Kn&S Properties Ltd | Real estate | 2022 |
| Knapp Legacy Ltd | Health & social care | 2022 |
| Knorpel Ltd | Professional & scientific | 2020 |
| Knowledge 4 ALL Foundation | Information & communication | 2009 |
| Knowmera Limited | Professional & scientific | 2025 |
| Kobeng Logistics/Services Ltd | Wholesale & retail | 2025 |
| Kodengo Limited | Information & communication | 2021 |
| Kohler Book Collections Limited | Wholesale & retail | 2018 |