| Key Ledgers Global Limited | Professional & scientific | 2020 |
| Key Production (London) Limited | Arts & recreation | 1993 |
| Key Production EOT Trustee Limited | Professional & scientific | 2023 |
| Keyhole Landscaping and Site Services Ltd | Real estate | 2020 |
| Keylake Properties Limited | Real estate | 2022 |
| Keyless Properties Limited | Real estate | 2019 |
| Keyline Keys Limited | Wholesale & retail | 2014 |
| Keymech Ltd | Wholesale & retail | 2025 |
| Keymore Estates Limited | Real estate | 2019 |
| Keypad Solution Limited | Information & communication | 2023 |
| Keypoint Intelligence (UK) Limited | Professional & scientific | 2011 |
| Keypoint Technologies PLC | Extraterritorial | 2015 |
| Keypride Homes Limited | Real estate | 2012 |
| Keys Consulting Ltd | Construction | 2017 |
| Keys of Success Limited | Construction | 2010 |
| Keys to Longevity Ltd | Wholesale & retail | 2026 |
| Keystone Opportunities Limited | Real estate | 2020 |
| Keystone Real Estate & Acquisitions Ltd | Real estate | 2022 |
| Keystone Tunnelling Limited | Professional & scientific | 2014 |
| Keyswot Ltd | Professional & scientific | 2020 |
| Keyvale Limited | Wholesale & retail | 1989 |
| Keyvan Holding Limited | Information & communication | 2024 |
| Keyzie Ltd | Other services | 2024 |
| Kezia Consulting Limited | Professional & scientific | 2025 |
| Kezia Noble Ltd | Administrative & support | 2011 |
| Keziahkairah Ltd | Health & social care | 2022 |
| Kezy Homes Ltd | Real estate | 2026 |
| KG Building and Home Improvement Limited | Construction | 2022 |
| KG Creativity Ltd | Information & communication | 2018 |
| KGC Facades UK Ltd | Manufacturing | 2020 |
| Kgdk Shepherds Bush Ltd | Hospitality | 2020 |
| Kgdk Southend Ltd | Hospitality | 2020 |
| KGF Amily Limited | Wholesale & retail | 2025 |
| KGM Developers Limited | Real estate | 2025 |
| Kgmg Services Limited | Construction | 2017 |
| KGN Consulting Limited | Professional & scientific | 2016 |
| KGN International Limited | Wholesale & retail | 2025 |
| KGR Acton Ltd | Hospitality | 2021 |
| KGR Edgware Ltd | Hospitality | 2021 |
| KGR Enfield Ltd | Hospitality | 2021 |
| KGR Southall Ltd | Hospitality | 2021 |
| KGR Tottenham Ltd | Hospitality | 2021 |
| KH Playtime Limited | Health & social care | 2021 |
| Khadar Awhussein Transport Ltd | Transport & logistics | 2017 |
| Khadim Services Limited | Financial services | 2018 |
| Khaitan Limited | Real estate | 2026 |
| Khakharia Properties Limited | Real estate | 2003 |
| Khalaf Auto Repair Ltd | Wholesale & retail | 2024 |
| Khalaf Motors Ltd | Wholesale & retail | 2024 |
| Khalil Construction Ltd | Construction | 2022 |
| Khamzina Ltd | Health & social care | 2013 |
| Khan & Co (Filtration) Limited | Manufacturing | 1996 |
| Khan Boxing Limited | Arts & recreation | 2005 |
| Khan Consultancy Solutions Limited | Extraterritorial | 2015 |
| Khan Investment Solutions Limited | Financial services | 2026 |
| Khan Media Ltd | Manufacturing | 2024 |
| Khan Mobile & Accessories Ltd | Wholesale & retail | 2025 |
| Khan Mobile Ltd | Wholesale & retail | 2026 |
| Khanate Foods Ltd | Hospitality | 2019 |
| Khanavali Limited | Hospitality | 2026 |
| Khaotica Voyager Ltd | Extraterritorial | 2022 |
| Khatri Corporation Ltd | Manufacturing | 2025 |
| Khayjai Limited | Financial services | 2011 |
| KHB Services Limited | Other services | 2019 |
| KHD Medical Limited | Health & social care | 2015 |
| KHD Properties Limited | Real estate | 2017 |
| KHI Albury Limited | Professional & scientific | 2014 |
| Khian G Ltd | Information & communication | 2017 |
| Khilji & Sons Limited | Real estate | 2016 |
| Khimani Investment Limited | Information & communication | 2006 |
| Khinda Bros Construction Ltd | Construction | 2020 |
| Khipri Consulting Ltd | Information & communication | 2024 |
| Khiz and Co Ltd. | Real estate | 2018 |
| Khizar Merchant Ltd | Wholesale & retail | 2026 |
| Khodal Limited | Wholesale & retail | 2025 |
| Khoob Consultancy Ltd. | Information & communication | 2013 |
| Khosla Properties Limited | Real estate | 2023 |
| Khosla Property & Investment Limited | Real estate | 2022 |
| Khosla Wines Ltd | Wholesale & retail | 2010 |
| Khrish PIA Investments Limited | Real estate | 2025 |
| KHS Management Limited | Hospitality | 2020 |
| Khurshid Khan Limited | Real estate | 2014 |
| Khushal Joshi Ltd | Professional & scientific | 2017 |
| Khushbu Traders UK Ltd | Wholesale & retail | 2025 |
| Khushi Consultech Ltd | Information & communication | 2026 |
| Khushi Foods UK Ltd | Wholesale & retail | 2025 |
| Khushi Property Limited | Real estate | 2026 |
| Khushkam Limited | Professional & scientific | 2009 |
| KHY Auto Solutions Ltd | Wholesale & retail | 2025 |
| KHY Electrical Services Ltd | Construction | 2024 |
| Khyber Business Services Ltd | Hospitality | 2024 |
| Khyber Exchange & Travel Ltd | Financial services | 2010 |
| Khyber Travel Limited | Administrative & support | 2012 |
| Khyzyl Saleem Art Ltd | Information & communication | 2015 |
| KI Holdings Ltd | Real estate | 2024 |
| KI Transport Services Limited | Transport & logistics | 2019 |
| KIA Gardening & Landscape Ltd | Administrative & support | 2024 |
| KIA IT Solutions Limited | Information & communication | 2020 |
| KIA KIA Consultancy Ltd | Professional & scientific | 2011 |
| Kiaaan & Co Services Limited | Administrative & support | 2025 |