| Kernik Properties Ltd | Real estate | 2019 |
| Kernowcatering Ltd | Hospitality | 2020 |
| Keshavraj Ltd | Wholesale & retail | 2021 |
| Kesselville Court Limited | Households | 1987 |
| KET Property Limited | Real estate | 2025 |
| Kevin Alderton and Team Limited | Professional & scientific | 2005 |
| Kevin Johnson Coaching Services Limited | Arts & recreation | 2011 |
| Key Developments (South East) Ltd | Construction | 2024 |
| Keyif Limited | Hospitality | 2019 |
| Keystone Contractors Group Ltd | Construction | 2024 |
| Keystone Real Estate Ltd | Real estate | 2019 |
| KFO Investments Limited | Real estate | 2019 |
| KG Construction Estimating Limited | Professional & scientific | 2015 |
| Kgdp Limited | Health & social care | 2021 |
| KH Blast Consultancy Ltd | Professional & scientific | 2016 |
| Khalids Kitchen II Limited | Hospitality | 2026 |
| Khawthip Limited | Hospitality | 2017 |
| Khouri Limited | Hospitality | 2008 |
| KHR Engineering Ltd | Manufacturing | 2023 |
| Kidalign Limited | Professional & scientific | 2023 |
| Kidd in a Sweet Shop Ltd | Information & communication | 2021 |
| Kids Active Zone Ltd | Education | 2017 |
| Kiekbusch Holding Ltd | Information & communication | 2019 |
| Kieviet Ltd | Financial services | 2024 |
| Kifco Electrical Services Limited | Construction | 2020 |
| Kifco Fire Doors Limited | Administrative & support | 2020 |
| Kifco Painting and Decorating Limited | Construction | 2020 |
| Kilpac Limited | Arts & recreation | 2018 |
| Kimberley Court Freehold Ltd | Households | 2015 |
| Kimbolton Dental Surgery Limited | Health & social care | 2025 |
| Kimour Ltd | Wholesale & retail | 2024 |
| Kincaid International Ltd | Administrative & support | 2018 |
| Kind Smile Dental Ltd | Health & social care | 2025 |
| Kindcare (UK) Ltd | Health & social care | 2005 |
| Kindcare Support Limited | Other services | 2025 |
| Kinetic Business Advice Limited | Administrative & support | 2011 |
| Kinetic Marketing Limited | Education | 2014 |
| King & Queen Souls Ltd | Wholesale & retail | 2024 |
| King Brothers (Eastbourne) Limited | Construction | 2008 |
| King Brothers (Southern) Limited | Construction | 2003 |
| King Sustainability Limited | Professional & scientific | 2024 |
| Kingdom Nursery Ltd | Education | 2025 |
| Kingdom Way Trust | Health & social care | 2010 |
| Kingdomcity United Kingdom Limited | Other services | 2018 |
| Kingpin Group Limited | Professional & scientific | 2022 |
| Kings Corporate Travel Limited | Administrative & support | 2025 |
| Kings Park Management Company Limited | Households | 1993 |
| Kingsland Eastbourne Limited | Households | 2002 |
| Kingston Orthodontics Ltd | Health & social care | 2018 |
| Kingswood House (Eastbourne) RTM Company Limited | Households | 2020 |
| Kinisi Consulting Limited | Administrative & support | 2025 |
| Kinoart Limited | Information & communication | 2024 |
| Kircata 80 Ltd | Construction | 2019 |
| Kirdford Trading Limited | Arts & recreation | 2017 |
| Kirpa Global DH Ltd | Other services | 2025 |
| Kirsten Court Ltd | Real estate | 2017 |
| Kiylo Limited | Information & communication | 2015 |
| KJ Express Cleaning Ltd | Administrative & support | 2025 |
| KJE Portfolio Ltd | Administrative & support | 2019 |
| KJM Scaffolding and Rigging Services Limited | Construction | 2016 |
| KK Dickinson Ltd | Health & social care | 2023 |
| KK Typhon Events Limited | Hospitality | 2023 |
| KLA Investments Limited | Real estate | 2019 |
| KLA Properties Ltd | Real estate | 2019 |
| Kleen-It Limited | Other services | 2001 |
| Klevra Ltd | Wholesale & retail | 2026 |
| Kloofs Park OP Limited | Professional & scientific | 2024 |
| Kloofs Park Opsh Limited | Professional & scientific | 2024 |
| KM Food Centre Limited | Hospitality | 2019 |
| KM Plumbsafe Limited | Construction | 2017 |
| KMS Surveyors Limited | Professional & scientific | 2020 |
| Knebworth Village Dental Limited | Health & social care | 2022 |
| Knight Commercial Ltd | Real estate | 2019 |
| Knight Properties (Family) Ltd | Real estate | 2026 |
| Knights Dental Care (Property) Limited | Health & social care | 2022 |
| Knights Dental Care Limited | Health & social care | 2022 |
| Knights Property Maintenance Ltd | Construction | 2022 |
| Knockout Pest Control Ltd | Administrative & support | 2020 |
| Knowle Taxi Services Ltd | Transport & logistics | 2018 |
| KO Electrical Contractors and Project Management Services Ltd | Construction | 2009 |
| Koda Legal Consultancy Limited | Administrative & support | 2023 |
| Kodak Fencing and Landscaping Ltd | Administrative & support | 2023 |
| Kodomatachi Limited | Professional & scientific | 2015 |
| Koko Aesthetics Ltd | Other services | 2017 |
| Komar Logistics Ltd | Transport & logistics | 2019 |
| Kompreno Ltd | Professional & scientific | 2015 |
| Koncept Developments Ltd | Real estate | 2018 |
| Konzepts Limited | Professional & scientific | 2017 |
| Kookie Creative Ltd | Professional & scientific | 2022 |
| Koprio Ltd | Professional & scientific | 2026 |
| Koska Family Limited | Extraterritorial | 2015 |
| Kovac Property Management Ltd | Real estate | 2025 |
| KP Apartments Limited | Real estate | 2016 |
| Kpsp Property Limited | Real estate | 2020 |
| Kp’S International Limited | Wholesale & retail | 2025 |
| KRA Brick Ltd | Other services | 2018 |
| Krish Consulting Limited | Professional & scientific | 2021 |
| Krishna Supermarket Limited | Wholesale & retail | 2024 |
| Krisstuition Ltd | Education | 2024 |
| Kristal Property Holdings Limited | Real estate | 2021 |