| KJB Contractors Limited | Administrative & support | 1991 |
| KJC Trees Ltd | Agriculture & fishing | 2018 |
| KJG Commercial Consulting Limited | Administrative & support | 2013 |
| KJP Independent Chauffeur Ltd | Administrative & support | 2003 |
| KJT Services Limited | Other services | 2021 |
| Kk&Co Limited | Professional & scientific | 2020 |
| Klambt Media Sales Ltd | Extraterritorial | 2024 |
| Klamp Construction Ltd | Construction | 2025 |
| KLC Limited | Education | 2001 |
| Kleens Car Wash Ltd | Administrative & support | 2024 |
| KLH Lifestyle Ltd | Health & social care | 2020 |
| KLJ Software | Professional & scientific | 1997 |
| KLM Home Care Ltd | Health & social care | 2017 |
| Kmcl Ltd | Construction | 2026 |
| Knac Consultancy Limited | Information & communication | 2016 |
| Knead Bread Ltd | Manufacturing | 2020 |
| Knight Fencing Limited | Administrative & support | 2003 |
| Knight Gordon Law Ltd | Professional & scientific | 2025 |
| Knight Property Developments Limited | Real estate | 2016 |
| Knights Gate Management Company Ltd | Households | 2022 |
| Knightsbridge Investment Company Ltd | Real estate | 2001 |
| Knightsbridge Productions Limited | Arts & recreation | 2021 |
| Knightsbridge Property Company Limited | Construction | 1998 |
| Knightswood Fencing Ltd | Administrative & support | 2025 |
| Knightswood Landscapes Ltd | Administrative & support | 2025 |
| Knord Performance Ltd | Wholesale & retail | 2021 |
| Know HOW Management Ltd | Professional & scientific | 2018 |
| Know the Score Books Limited | Professional & scientific | 2010 |
| Kodev Infotech Ltd | Information & communication | 2017 |
| Kolimpri Limited | Professional & scientific | 2019 |
| Kompak Group Ltd | Manufacturing | 2023 |
| Kontron UK Limited | Manufacturing | 1996 |
| Kookycrystals Ltd | Wholesale & retail | 2026 |
| Koracle Ltd | Professional & scientific | 2022 |
| Krasoski Ltd | Real estate | 2021 |
| Krav Maga Limited | Education | 2006 |
| Kristina Young Hair Additions Limited | Other services | 2021 |
| Krokus Limited | Administrative & support | 2011 |
| Krokus Window Cleaning Limited | Administrative & support | 2009 |
| Krosstouche Ltd | Wholesale & retail | 2026 |
| KRT Alliance Ltd | Wholesale & retail | 2024 |
| Kruse Creek Limited | Construction | 1994 |
| Krynauw Holdings Limited | Health & social care | 2024 |
| KSL Accountants & Business Advisors Ltd | Professional & scientific | 2024 |
| KSL Company Secretary Limited | Administrative & support | 2007 |
| Ksph Financial Ltd | Financial services | 2022 |
| KSR Lighting Limited | Administrative & support | 2009 |
| Kuscoffee Limited | Manufacturing | 2024 |
| Kutchenhaus Chichester Ltd | Wholesale & retail | 2017 |
| KW510 Ltd | Information & communication | 2025 |
| L R Savage Landscapes Limited | Administrative & support | 2008 |
| L West & SON Carpentry & Joinery Ltd | Manufacturing | 2024 |
| L West & SON Plumbing & Heating Ltd | Construction | 2024 |
| L&C Clothing & Homeware Ltd | Information & communication | 2024 |
| L'Assemblage Limited | Other services | 1995 |
| L.A Kane Limited | Information & communication | 2015 |
| L.Corr Instrument Services Ltd | Administrative & support | 2007 |
| L.P. Eight Limited | Households | 1998 |
| L.W. Bettridge Limited | Construction | 1964 |
| L51 Vines Ltd | Agriculture & fishing | 2025 |
| LA Rambla Research Ltd | Professional & scientific | 2018 |
| Laddinvest Ltd | Real estate | 2022 |
| Ladrillos Facilities Limited | Construction | 2018 |
| Ladybird Montessori Nursery School Limited | Education | 2001 |
| Lakeside Land Developers Limited | Real estate | 2015 |
| Lambstew Ltd | Other services | 2017 |
| Lammasses Limited | Information & communication | 2021 |
| Landacre (Chichester) Limited | Construction | 2020 |
| Landacre (Fishbourne) Limited | Construction | 2019 |
| Landacre (Ringwood) Ltd | Construction | 2023 |
| Landacre Developments Ltd | Construction | 2016 |
| Landacre Estates Ltd | Construction | 2021 |
| Landacre Ltd | Construction | 2021 |
| Landcruise Motorhome Hire Limited | Administrative & support | 2013 |
| Landlink Developments 2 Limited | Other services | 2018 |
| Landlink Developments 3 Limited | Real estate | 2019 |
| Landlink Developments 4 Limited | Real estate | 2019 |
| Landlink Developments 5 Limited | Real estate | 2021 |
| Landlink Estates Limited | Other services | 1993 |
| Landscaping Complete Limited | Administrative & support | 2012 |
| Langford Farm Barns Management Company Limited | Administrative & support | 2008 |
| Langmead Farms Limited | Agriculture & fishing | 2025 |
| Langmead Herbs Limited | Agriculture & fishing | 1999 |
| Langmead Jordan Limited | Financial services | 2016 |
| Langmead Produce Limited | Other services | 2010 |
| Langmeads of Flansham Limited | Agriculture & fishing | 1956 |
| Langmoor Prinsted Limited | Administrative & support | 2020 |
| Langton Court Residents Limited | Households | 1995 |
| Lanka Court Management Limited | Households | 1984 |
| Lantern Music Limited | Information & communication | 2008 |
| Lantro Ltd | Professional & scientific | 2020 |
| Lanzia Ltd | Wholesale & retail | 2024 |
| Lateral Alliances Limited | Professional & scientific | 2018 |
| Latina Ltd | Hospitality | 2015 |
| Laugharne Management Consultancy Limited | Professional & scientific | 2006 |
| Launchpad C T Limited | Hospitality | 2018 |
| Launchpad Consulting Group Ltd | Professional & scientific | 2023 |
| Launchpad X Ltd | Information & communication | 2025 |
| Laurence Keep Limited | Administrative & support | 2013 |
| Laurier Court (Worthing) Management Company Limited | Households | 1979 |