| Kearsley Barbers Ltd | Other services | 2025 |
| Kearsley Properties Limited | Professional & scientific | 1972 |
| Kebab & Curry POT Limited | Hospitality | 2025 |
| Kebab World (Wigan) Ltd | Hospitality | 2024 |
| Kectover Limited | Real estate | 2025 |
| Keenan Healthcare Ltd | Administrative & support | 2013 |
| Keepwarm Eco Ltd | Construction | 2018 |
| Keepwarm Properties Ltd | Construction | 2018 |
| Keith Olive Decorators Limited | Construction | 2016 |
| Keith Woodrow Flooring Specialist Ltd | Construction | 2018 |
| Kelley Consultancy Limited | Information & communication | 2018 |
| Kelpcandle Ltd | Wholesale & retail | 2019 |
| Kemp Aesthetics Ltd | Other services | 2024 |
| KEN Bromley Art Supplies Ltd | Wholesale & retail | 1989 |
| Kenmor Property Limited | Real estate | 2013 |
| Kenneally Ltd | Professional & scientific | 2026 |
| Kennedy Lloyd Limited | Administrative & support | 2009 |
| Kenneth Macmillan and Partner LLP | | 2011 |
| Kenny Global Properties Limited | Real estate | 2018 |
| Kenny Investments Ltd | Financial services | 2017 |
| Kennys Cakes Limited | Wholesale & retail | 2020 |
| Kensho FMC Limited | Professional & scientific | 2024 |
| Kensington Road Management Company Limited | Households | 2004 |
| Kent & Surrey Plastering Group Ltd | Construction | 2026 |
| Kenwood Construction & Sons Ltd | Construction | 2016 |
| Kenwood Consultancy Ltd | Professional & scientific | 2026 |
| Kenworthy Estates Limited | Real estate | 2017 |
| Kenyon Management Services Ltd | Professional & scientific | 2014 |
| Kept Fit Limited | Arts & recreation | 2015 |
| Kerbside Rescue Services Limited | Transport & logistics | 2024 |
| Kermane Ltd | Transport & logistics | 2025 |
| Kernick Holdings (North West) Limited | Financial services | 2025 |
| Kerridge Mortgages Limited | Financial services | 2021 |
| Kerry Whelpdale Limited | Other services | 2022 |
| Kerrystylist Limited | Other services | 2024 |
| Kerudele Auto Services Ltd | Wholesale & retail | 2025 |
| Kestonbond Holdings Limited | Real estate | 1992 |
| Kestonbond Property Management Limited | Real estate | 1995 |
| Kestrel Abodes Limited | Real estate | 2021 |
| Kestrel House London Limited | Education | 2007 |
| Kestrel IT Support Services Limited | Information & communication | 2022 |
| Kevan Duckworth Joinery Ltd | Construction | 2006 |
| Kevic Investments Limited | Real estate | 2012 |
| Kevin Critten Services Limited | Transport & logistics | 2021 |
| Kevin Meagher (Communications) Limited | Administrative & support | 2009 |
| Kevin Moore Services Limited | Transport & logistics | 2020 |
| Kevin Slater Decorators Ltd | Construction | 2006 |
| KEW Green Studios Limited | Real estate | 2024 |
| Kexal Consulting Limited | Professional & scientific | 2013 |
| Key Control Services (Holdings) Ltd | Financial services | 2025 |
| Key Control Services Ltd | Administrative & support | 2001 |
| Key Day Snooker Services Ltd | Transport & logistics | 2024 |
| Key Digital Ltd | Administrative & support | 2010 |
| Key Flex Services Ltd | Administrative & support | 2025 |
| Key Housing Ltd | Real estate | 2022 |
| Key One Properties Ltd | Real estate | 2020 |
| Key PE Sports Limited | Education | 2014 |
| Key Plumbing & Heating Limited | Construction | 2006 |
| Key Prep Solutions Ltd | Construction | 2026 |
| Key Property Service Ltd | Administrative & support | 2014 |
| Key Secure Locksmiths Ltd | Professional & scientific | 2025 |
| Key Trailer Solutions Ltd | Manufacturing | 2019 |
| Keychain Limited | Administrative & support | 2015 |
| Keyfinch Limited | Households | 2000 |
| Keyframe U.K. Limited | Manufacturing | 1994 |
| Keygeni Holdings Limited | Professional & scientific | 2019 |
| Keygeni Limited | Professional & scientific | 2019 |
| Keygeni Repair Limited | Construction | 2024 |
| Keygeni Software Limited | Professional & scientific | 2019 |
| Keys Estate Ltd | Real estate | 2025 |
| Keys Piano School Limited | Education | 2018 |
| Keys to Success Consulting Limited | Extraterritorial | 2016 |
| Keystone Comms Ltd | Professional & scientific | 2024 |
| Keystone Facility Management Limited | Professional & scientific | 2025 |
| Keystone Holdings (NW) Limited | Real estate | 2025 |
| Keystone Northern Group Limited | Construction | 2025 |
| Keywise Sales Limited | Extraterritorial | 1996 |
| KG Planning Ltd | Professional & scientific | 2015 |
| KGB Cleaning & Support Services Limited | Administrative & support | 1994 |
| KGB Holdings Limited | Professional & scientific | 2000 |
| KGB Property Renovations Ltd | Construction | 2026 |
| Kgmate Ltd | Real estate | 2019 |
| KGN Beauty Ltd | Wholesale & retail | 2025 |
| KGN Foodies Limited | Hospitality | 2026 |
| KGN Prestige Ltd | Construction | 2024 |
| KGN Trade Ltd | Wholesale & retail | 2022 |
| Kgni Ltd | Wholesale & retail | 2026 |
| Kgnr Ltd | Manufacturing | 2026 |
| KGV Property & Stays Group Ltd | Real estate | 2025 |
| KGV Property Ltd | Real estate | 2024 |
| KH Consultancy Services Limited | Information & communication | 2024 |
| KH Goods UK Ltd | Wholesale & retail | 2023 |
| Khadija Traders Ltd | Wholesale & retail | 2026 |
| Khadijah Properties Limited | Real estate | 2024 |
| Khadli & Co Ltd | Wholesale & retail | 2019 |
| Khafayah Consultancy Ltd. | Other services | 2017 |
| Khairunnas Relief Foundation | Health & social care | 2023 |
| Khak for Translations and Advises Ltd | Professional & scientific | 2021 |
| Khamsa Consulting Limited | Professional & scientific | 2025 |
| Khan 786 Driving School Ltd | Education | 2023 |