| KD Chaplin Cafe Limited | Hospitality | 2020 |
| KD Property and Investment Ltd | Real estate | 2025 |
| KD Sparks Limited | Construction | 2013 |
| KDJ Management Limited | Real estate | 2019 |
| KDL Designs Ltd | Wholesale & retail | 2021 |
| KDM Interiors Ltd | Construction | 2019 |
| KDS Advisory Limited | Professional & scientific | 2024 |
| KDS Railsafe Limited | Transport & logistics | 2005 |
| KE Developments Limited | Real estate | 2024 |
| KE Engineering Ltd | Manufacturing | 2025 |
| Kearton Place (Freeholders) Ltd | Households | 1999 |
| Keating Electrical Limited | Construction | 2009 |
| Kebabnstuff Ltd | Hospitality | 2026 |
| Kebabzz Ltd | Hospitality | 2025 |
| Keegs Limited | Health & social care | 2015 |
| Keensbury Support Services Limited | Construction | 2015 |
| Keep EM Ltd | Other services | 2022 |
| Keep IT Moving CIC | Other services | 2024 |
| Keep IT RAW Pet Supplies Ltd | Manufacturing | 2022 |
| Keep the Change Limited | Education | 2006 |
| Keeper.Fashion Ltd | Wholesale & retail | 2024 |
| Keepers Close Management Company Limited | Households | 2003 |
| Keepers Lodge Management Company Limited | Households | 2008 |
| Keepers Lodge Management Company Number 2 Limited | Households | 2015 |
| Keeping Hope Limited | Administrative & support | 2022 |
| KEG Cellar Ltd | Wholesale & retail | 2024 |
| KEG Garden Limited | Professional & scientific | 2024 |
| Keilingha Investments Limited | Financial services | 2020 |
| Keisam Limited | Financial services | 2020 |
| Keith & Lara Smith Limited | Other services | 2003 |
| Keith Day & Partners Limited | Professional & scientific | 1966 |
| Keith Miller Carpentry Ltd | Construction | 2026 |
| Keith Morgan Ltd | Real estate | 2023 |
| Kelemati Limited | Wholesale & retail | 2025 |
| Keles Fast Food Limited | Hospitality | 2020 |
| Kellex Limited | Transport & logistics | 1982 |
| Kelvedon Residents Association Limited | Households | 1975 |
| Kempton Care and Support Services Ltd | Health & social care | 2021 |
| Kempwrights Limited | Professional & scientific | 1965 |
| Kemzphotography Ltd | Professional & scientific | 2025 |
| KEN Rawlinson Associates Limited | Professional & scientific | 2007 |
| Kend Professionals Limited | Health & social care | 2020 |
| Kendall Heights Management Company Limited | Households | 2010 |
| Kenestred International Limited | Wholesale & retail | 2018 |
| Kenley Gardens Management Limited | Households | 1995 |
| Kenmore House (Balham) Management Limited | Households | 2006 |
| Kenmore House Residents Management Company Ltd. | Real estate | 2013 |
| Kenn Export Limited | Administrative & support | 2004 |
| Kennedy Family Land LLP | | 2024 |
| Kennet House Management Company Limited | Households | 2014 |
| Kennington Palace Court Limited | Households | 1981 |
| Kennington Place Management Limited | Households | 2001 |
| Kensington Beta Investments Limited | Real estate | 2017 |
| Kensington Court Bare Freehold Limited | Hospitality | 2014 |
| Kensington Gamma Investments Limited | Real estate | 2017 |
| Kensington House (Lancaster) Limited | Households | 1982 |
| Kensington Omega Investments Limited | Financial services | 2018 |
| Kensington Oval Management Company Limited | Households | 2005 |
| Kensington Parkgate Investments Limited | Financial services | 1997 |
| Kensington Zeta Investments Limited | Real estate | 2017 |
| Kent and London Pain Clinic Limited | Health & social care | 2020 |
| Kent County Transport Limited | Transport & logistics | 2015 |
| Kent Market Ltd | Wholesale & retail | 2019 |
| Kentish Gardens Estate Management Ltd | Households | 2008 |
| Kentster Limited | Construction | 2024 |
| Kenyon Consultancy Ltd | Professional & scientific | 2025 |
| Kerala Supermarket Limited | Wholesale & retail | 2019 |
| Keralu Leather Ltd | Manufacturing | 2026 |
| Kerbglen Limited | | 1980 |
| Kerria Warriors Ltd | Arts & recreation | 2025 |
| Kerridge Close Residents Association Limited | Households | 2011 |
| Kerrs Accountants Limited | Extraterritorial | 2002 |
| Kerry Fisher Ltd | Arts & recreation | 2013 |
| Kerry Properties (Croydon) Limited | Real estate | 2008 |
| Keshfin Financial Limited | Financial services | 2025 |
| Keston Court Management Company Limited | Households | 1990 |
| Keston Court RTM Company Limited | Households | 2012 |
| Keston Waterside Freehold Limited | Households | 2014 |
| Ketra Logistics Limited | Transport & logistics | 1978 |
| Ketton Court (Luton) Limited | Households | 1970 |
| Ketumax Limited | Wholesale & retail | 1995 |
| Kevin Balog Services Ltd | Construction | 2020 |
| Kevin Murray Golf Limited | Professional & scientific | 2002 |
| Kevin News Limited | Wholesale & retail | 2007 |
| Kevington Roofing & Building Limited | Construction | 2020 |
| Kevz Limited | Transport & logistics | 2017 |
| KEW Foods Limited | Manufacturing | 2018 |
| KEW Miller Limited | Wholesale & retail | 2026 |
| Kewstone England Ltd | Wholesale & retail | 2010 |
| Key Difference Ltd | Real estate | 2024 |
| Key Display Limited | Manufacturing | 2021 |
| Key Skills Education Ltd | Administrative & support | 2010 |
| Key Stage Learning Ltd | Education | 2020 |
| Key Supplies Limited | Wholesale & retail | 2012 |
| Key Vision Ltd | Households | 2015 |
| Keyaan Purvi Limited | Real estate | 2025 |
| Keybar Global Limited | Administrative & support | 2003 |
| Keybar Limited | Administrative & support | 1978 |
| Keydrift Ltd | Administrative & support | 2022 |
| Keyguess Limited | Wholesale & retail | 1988 |