| Kaizen Renaissance Ltd | Professional & scientific | 2026 |
| Kalan Finance LLP | | 2010 |
| Kaleo Education Ltd | Education | 2026 |
| Kali Consultancy Solutions Ltd | Administrative & support | 2025 |
| Kalimera Consulting Ltd | Professional & scientific | 2025 |
| Kallpa Limited | Wholesale & retail | 2021 |
| Kalos Media Group Ltd | Construction | 2025 |
| Kalta Limited | Professional & scientific | 2004 |
| Kamara Design Studio Ltd | Arts & recreation | 2025 |
| Kani Panka Limited | Wholesale & retail | 2025 |
| Kappa Plumbing & Heating Limited | Construction | 2022 |
| KAR Academy Ltd | Education | 2019 |
| Kara Coban Cafe Ltd | Hospitality | 2026 |
| Karim's Kar's Ltd | Wholesale & retail | 2012 |
| Karine Retail Ltd | Wholesale & retail | 2024 |
| Karkar Group Limited | Professional & scientific | 2016 |
| Karl Parton Ltd | Information & communication | 2013 |
| Karlene Cass Productions Limited | Administrative & support | 2004 |
| Karuzela Productions Limited | Information & communication | 2022 |
| KAT Rolley Limited | Professional & scientific | 2008 |
| Kate Armitage Consulting Limited | Professional & scientific | 2017 |
| Kate Bell Ltd | Health & social care | 2023 |
| Kate Forrester Illustration Ltd | Information & communication | 2013 |
| Katie Avery Studio Ltd | Other services | 2020 |
| Kauf Creative Ltd | Professional & scientific | 2017 |
| Kauri Consulting Limited | Information & communication | 1997 |
| Kauri Marketing Ltd | Other services | 2020 |
| Kazanjo Limited | Financial services | 2020 |
| Kazanjo Systems Limited | Manufacturing | 2013 |
| Kazi Capital Partners Ltd | Financial services | 2017 |
| Kazix Ltd | Health & social care | 2021 |
| KBB Dental Ltd | Health & social care | 2014 |
| Kbmg Investments Limited | Financial services | 2024 |
| KBW Films Limited | Information & communication | 2012 |
| KC Electrical Distributors Ltd | Wholesale & retail | 2025 |
| KDG (Wimbledon) Limited | Construction | 2026 |
| KE Dental Ltd | Health & social care | 2025 |
| Kebab Brighton UK Ltd | Hospitality | 2020 |
| Keen AS Mustard Ltd | Information & communication | 2016 |
| Keenan Business Analysis Services Ltd | Professional & scientific | 2026 |
| Keensoft Limited | Information & communication | 2009 |
| Keep Smiling UK Ltd | Health & social care | 2008 |
| Keeping IT Clean Sussex Limited | Administrative & support | 2011 |
| Kehemi Limited | Wholesale & retail | 2017 |
| Keith P Nicholson Ltd | Information & communication | 2014 |
| Kellaway Property Holdings Ltd | Real estate | 2025 |
| Kelsey Investments Limited | Real estate | 1961 |
| Kelz J Bukka & Grills Limited | Hospitality | 2026 |
| Kembles Property Ltd | Real estate | 2025 |
| Kemptown Rooms Ltd | Hospitality | 2018 |
| Kenilworth Limited | Households | 1996 |
| Kenley Dental Practice Limited | Health & social care | 2026 |
| Kenna Productions Ltd | Information & communication | 2008 |
| Kennedy Martin Health Outcomes Limited | Professional & scientific | 2006 |
| Kenray Limited | Manufacturing | 1984 |
| Kensington Court Hove Limited | Households | 1995 |
| Kensington Gardens Stall Limited | Wholesale & retail | 2025 |
| Kenthill Associates Ltd | Agriculture & fishing | 2022 |
| Kerly KEW Investments Ltd | Administrative & support | 2018 |
| Kernel of Hove Ltd | Wholesale & retail | 2016 |
| Kernow Taverns Ltd | Hospitality | 2003 |
| Kerri Reid Limited | Information & communication | 2008 |
| Kerrouche Limited | Other services | 2020 |
| Kershaw Health Limited | Professional & scientific | 2023 |
| Kesel Health Services Ltd | Health & social care | 2025 |
| Key Cities Innovation Network Ltd | Professional & scientific | 2024 |
| Keycoast Limited | Real estate | 1986 |
| Kfit Floors Limited | Construction | 2016 |
| KG Orthodontics Limited | Health & social care | 2025 |
| KH (Hove) Management Company Limited | Households | 2020 |
| KH Brokers Limited | Wholesale & retail | 2022 |
| KH Ecom Limited | Wholesale & retail | 2024 |
| KH Trade Solutions Limited | Wholesale & retail | 2025 |
| Khalil Holiday Properties Ltd | Hospitality | 2025 |
| Khalil Leasing Limited | Real estate | 2015 |
| Khalil Properties Limited | Real estate | 2008 |
| Khandhawa Properties Limited | Real estate | 2017 |
| Khaos Limited | Administrative & support | 2009 |
| KHG Northwood Limited | Construction | 2025 |
| Khosla Capital Limited | Professional & scientific | 2016 |
| Kiara’S Group PVT Ltd | Wholesale & retail | 2025 |
| Kickstart Performance Ltd | Arts & recreation | 2020 |
| Kiddo Carousel Limited | Wholesale & retail | 2021 |
| Kidease Travel Gear Ltd | Administrative & support | 2016 |
| Kids Talk Psychology Services Limited | Health & social care | 2006 |
| Kiernan Travel Limited | Administrative & support | 2021 |
| Kifco Property Services Limited | Other services | 2015 |
| Kiihtu Ltd | Wholesale & retail | 2022 |
| Kilgarriff Ltd | Households | 2019 |
| Kiln Media Limited | Information & communication | 2015 |
| Kimmel Life Limited | Manufacturing | 2025 |
| Kimura Americana Limited | Arts & recreation | 2011 |
| KIN Pilates Limited | Other services | 2023 |
| Kindfulway Ltd | Health & social care | 2025 |
| Kindheart Health & Impact Ltd | Information & communication | 2025 |
| Kindred Communications Ltd | Information & communication | 2019 |
| Kindred Hair & Beauty (Hove) Ltd | Other services | 2026 |
| Kindred Hair & Beauty Limited | Other services | 2025 |
| Kineo Consulting Group Limited | Administrative & support | 2025 |
| King Logistic Services Ltd | Administrative & support | 2023 |