| Kingdom Landscapes Limited | Construction | 2017 |
| Kingdom Nation Ltd | Other services | 2025 |
| Kingmead Homes (Holdings) Ltd | Construction | 2021 |
| Kingmead Homes (Newlands) Limited | Construction | 2019 |
| Kingmead Homes (Warwick) Ltd | Construction | 2023 |
| Kingmead Homes Housing Growth LLP | | 2023 |
| Kingmead Investments Limited | Construction | 2004 |
| Kingmead Limited | Construction | 2001 |
| Kingmead Services Limited | Real estate | 2025 |
| Kings Esplanade Limited | Households | 2000 |
| Kingscott Consulting Limited | Administrative & support | 2025 |
| Kingsgate 111 the Drive Hove RTM Company Limited | Households | 2017 |
| Kingsley Grey Limited | Administrative & support | 2016 |
| Kingsoak Construction Limited | Construction | 2020 |
| Kingsthorpe Road Management Company Limited | Households | 2017 |
| Kingston Mobile Catering Limited | Hospitality | 2025 |
| Kingsway (Hove) Residents Association Limited | Households | 1989 |
| Kingsway Care Ltd | Health & social care | 2020 |
| Kingsway Court Barbershop Limited | Other services | 2015 |
| Kingsway Court Freeholders Limited | Real estate | 1994 |
| Kingsway People Ltd | Real estate | 2020 |
| Kinsale Court Hove Ltd | Households | 2025 |
| Kinsman & Co Marketing Ltd | Professional & scientific | 2023 |
| Kirk Eyewear Ltd | Administrative & support | 2013 |
| Kirsty Henthorne Corporate Coaching Limited | Professional & scientific | 2011 |
| Kirsty Mitchell Photography Ltd | Arts & recreation | 2010 |
| Kirsty Wither Limited | Arts & recreation | 2002 |
| Kismet Tandoori Hove Ltd | Hospitality | 2025 |
| Kitson Homes Limited | Real estate | 2024 |
| KJ Baking Ltd | Manufacturing | 2013 |
| KJC Electrical Ltd | Construction | 2014 |
| Kkdr Limited | Hospitality | 2022 |
| Kkpodiatry Limited | Health & social care | 2025 |
| KKS Recovery Ltd | Wholesale & retail | 2025 |
| KL Health Consulting Limited | Professional & scientific | 2024 |
| KL Platt Limited | Health & social care | 2025 |
| Klas Developments Limited | Real estate | 2014 |
| Klas Properties LLP | | 2013 |
| Kleo Properties Ltd | Real estate | 2020 |
| Klvh Associates Ltd | Professional & scientific | 2025 |
| Klybro House(Maintenance)Limited | Households | 1964 |
| KMA Sussex Ltd | Construction | 2024 |
| KMD Property Ltd | Construction | 2015 |
| Kmdm Products Limited | Wholesale & retail | 2020 |
| KMG Accountancy Ltd | Professional & scientific | 2017 |
| KMG Independent Limited | Financial services | 2004 |
| KMG Investment Management Limited | Financial services | 2013 |
| KMG Investments Ltd | Real estate | 2019 |
| KMX Policy Innovation Ltd | Professional & scientific | 2024 |
| Kndla Ltd | Information & communication | 2026 |
| Knejna Ltd | Real estate | 2025 |
| Knight & Hamilton Ltd | Other services | 2020 |
| Knight Stays Limited | Households | 2025 |
| Knights Court Residents Property Management Limited | Households | 2004 |
| Knights Technology Search & Selection Limited | Administrative & support | 1999 |
| Knocknarea Estates Ltd | Real estate | 2021 |
| Knoll Local Limited | Wholesale & retail | 2026 |
| Knolldowne Properties Limited | Real estate | 1979 |
| KO Pharma Advisory Ltd | Professional & scientific | 2026 |
| Kodo Gardens Limited | Administrative & support | 2022 |
| Kokosis & Co Limited | Health & social care | 2022 |
| Kolanut Media Ltd | Information & communication | 2023 |
| Kombo Labs Ltd | Wholesale & retail | 2021 |
| Komo Consult Limited | Professional & scientific | 2014 |
| Komodo Scenery Limited | Information & communication | 2025 |
| Koncz Limited | Construction | 2025 |
| Koop Limited | Manufacturing | 2008 |
| Koop-Waters Ltd | Hospitality | 2025 |
| Korp Conservation Ltd | Construction | 2020 |
| Kouridis Social Care Consulting Ltd | Professional & scientific | 2022 |
| KP Electrical Ltd | Manufacturing | 2019 |
| Kpwork Limited | Health & social care | 2023 |
| KRA Technical Ltd | Administrative & support | 2009 |
| Kreative Blue Marketing Ltd | Professional & scientific | 2025 |
| KS Investments Sussex Ltd | Financial services | 2022 |
| Kshrn Limited | Wholesale & retail | 2023 |
| Ksrg Limited | Real estate | 2015 |
| KSS Consultants Ltd | Professional & scientific | 2016 |
| KT Procurement Ltd | Professional & scientific | 2026 |
| Kuadelmazi Ltd | Health & social care | 2023 |
| Kudos 888 Ltd | Hospitality | 2024 |
| Kusikuy Ltd | Hospitality | 2022 |
| KV Legal Limited | Professional & scientific | 2022 |
| KW Carpentry and Building Services Ltd | Manufacturing | 2026 |
| Kwick Blocks Ltd | Information & communication | 2023 |
| Kybertek Ltd | Information & communication | 2016 |
| Kyestar Ltd | Professional & scientific | 2010 |
| Kyra EA Services Ltd | Administrative & support | 2019 |
| L & C Group (Sussex) Ltd | Wholesale & retail | 2018 |
| L & Co. Design Limited | Professional & scientific | 2002 |
| L & J Roofing Solutions Limited | Construction | 2017 |
| L & T Limited | Real estate | 1990 |
| L G Stevens Decorating Limited | Construction | 2003 |
| L T Vaughan Ltd | Wholesale & retail | 2015 |
| L&F Estates Ltd | Real estate | 2023 |
| L&M Fitness Ltd | Arts & recreation | 2024 |
| L. T. Carpentry and Building Services Ltd | Construction | 2014 |
| L.A. Helicopters Ltd | Transport & logistics | 2022 |
| L.V. Developments Ltd | Real estate | 2015 |
| L.Va Ltd | Real estate | 2024 |