| Kent OIL Heating Services Limited | Construction | 2026 |
| Kent Psychologist Limited | Health & social care | 2007 |
| Kent Squint Surgery Ltd | Health & social care | 2023 |
| Kent Student Services Ltd | Education | 2017 |
| Kent Surgeon Ltd | Health & social care | 2012 |
| Kent Valeting Services Limited | Administrative & support | 2004 |
| Kentec Group Holdings Ltd | Financial services | 2014 |
| Kentec Lifts Limited | Construction | 2011 |
| Kentec Training Ltd | Wholesale & retail | 2008 |
| Kentish Estates Ltd | Hospitality | 2025 |
| Kentish Plumbers Ltd | Construction | 2019 |
| Kershaws Limited | Real estate | 2006 |
| Ketterbridge Life Sciences Limited | Professional & scientific | 2025 |
| Kevin Summers Photography Limited | Professional & scientific | 2003 |
| Kevin-Gerald Stanford | Extraterritorial | 2024 |
| Key Moment Security Ltd | Construction | 2023 |
| Key PM Limited | Hospitality | 2026 |
| Keypea Limited | Professional & scientific | 2023 |
| Keyplumbing Limited | Administrative & support | 2016 |
| Kgbt Ltd | Administrative & support | 2026 |
| KH Skin Limited | Health & social care | 2020 |
| Khanstruction Ltd | Construction | 2015 |
| Khot Creations Limited | Information & communication | 2014 |
| Kiasu Group Holdings Ltd | Professional & scientific | 2009 |
| Kiasu International Limited | Financial services | 2022 |
| Kilinc Catering Limited | Hospitality | 2026 |
| Kiln Lane Association Limited | Other services | 2003 |
| Kilowatt Electricals Limited | Construction | 2008 |
| KIM Assist Ltd | Professional & scientific | 2022 |
| Kinder Anaesthetics Ltd | Health & social care | 2017 |
| Kindred Hearts Ltd | Health & social care | 2018 |
| Kingfisher Fulfilment Services Ltd | Other services | 2008 |
| Kings Toll Garage Ltd | Wholesale & retail | 2024 |
| Kingsdale Limited | Professional & scientific | 1986 |
| Kingsland Capital Limited | Real estate | 2014 |
| Kingsley Court Management (Wadhurst) Limited | Households | 1989 |
| Kingston Energy Consulting Limited | Administrative & support | 2002 |
| Kingswood Training Services Limited | Education | 2018 |
| Kippingspaws Ltd | Other services | 2026 |
| Kirin H Foods Limited | Hospitality | 2019 |
| Kirk Gynaecology Ltd | Health & social care | 2022 |
| KIT Monster Supplies Limited | Wholesale & retail | 2007 |
| Kith 'N' KIN CIC | Health & social care | 2020 |
| Kito Health Ltd | Health & social care | 2025 |
| Kittiwake Productions Limited | Information & communication | 2010 |
| KJR Service Limited | Construction | 2009 |
| Klkg Invest Limited | Real estate | 2017 |
| Kluna Limited | Wholesale & retail | 2021 |
| KM Surveying Ltd | Professional & scientific | 2017 |
| KML Medical Ltd | Health & social care | 2019 |
| KN Property Maintenance & Renovations Ltd | Construction | 2017 |
| Knight Alarms Limited | Manufacturing | 2004 |
| Knights Joinery Ltd. | Manufacturing | 2019 |
| Knights of Oxney Building Contractors Ltd | Water & waste | 2020 |
| Knights Reach (Dartford) (Block 11) Residents Management Company Limited | Households | 2024 |
| Knights Reach (Dartford) Residents Management Company Limited | Households | 2024 |
| Knights Security Systems Limited | Administrative & support | 2012 |
| KNM Consulting Limited | Professional & scientific | 2024 |
| Knockout Barz Ltd | Information & communication | 2024 |
| Knockout Print Services Limited | Manufacturing | 2010 |
| Knot Works Ltd | Arts & recreation | 2021 |
| Knotley Hall Property Management Limited | Real estate | 1997 |
| Know. Consulting Limited | Professional & scientific | 2019 |
| Knowledge Seed Solutions Limited | Administrative & support | 2015 |
| Kodiac Solutions Ltd | Administrative & support | 2011 |
| KOL Communications Limited | Households | 2002 |
| KOL Properties Ltd | Real estate | 2024 |
| Komik Limited | Wholesale & retail | 2016 |
| Konsidered Ltd | Professional & scientific | 2022 |
| Konsul Ltd | Information & communication | 2019 |
| Koteva Limited | Health & social care | 2015 |
| Koti Tech Ltd | Information & communication | 2020 |
| Kpcg Ltd | Hospitality | 2024 |
| Kratositconsulting Limited | Information & communication | 2017 |
| KRC Endurance Limited | Arts & recreation | 2005 |
| Krispy Chicks Limited | Hospitality | 2025 |
| Kristiana Gordon Limited | Health & social care | 2015 |
| Kronos International Consulting Limited | Professional & scientific | 2019 |
| Kruger Group Limited | Professional & scientific | 2019 |
| Krumins Keys Limited | Real estate | 2020 |
| KS Plant Hire Limited | Administrative & support | 2007 |
| Ksfp Ltd | Construction | 2008 |
| Kstrong Holding UK Ltd | Financial services | 2018 |
| KT Candles Ltd | Manufacturing | 2012 |
| Kwjs Ltd | Wholesale & retail | 2026 |
| L C Wakeman Limited | Construction | 2013 |
| L N Louis Ltd | Professional & scientific | 2013 |
| L Wheeler & Sons LLP | | 2020 |
| L'Amour Montague Properties Limited | Real estate | 2006 |
| L.D. Griffiths Limited | Transport & logistics | 1978 |
| L.G. Circuits Ltd | Construction | 2021 |
| L.Wheeler and Sons(East Peckham)Limited | Agriculture & fishing | 1952 |
| L.Y.D.N Ltd | Construction | 2020 |
| LA Macchina - Sports & Classics Ltd | Wholesale & retail | 2022 |
| LA Pachamama Limited | Arts & recreation | 2016 |
| LA Petite France Ltd | Hospitality | 2021 |
| Laasys Technologies Limited | Information & communication | 2014 |
| Labrador Music Ltd | Information & communication | 2020 |
| Lacyford Consulting Limited | Real estate | 2010 |
| Lacyford Holdings Limited | Real estate | 2010 |