| Kairon Bridge Ltd | Wholesale & retail | 2026 |
| Kairovu Ltd | Information & communication | 2026 |
| Kaiyangtrade Ltd | Wholesale & retail | 2026 |
| Kaizen Web Ltd | Information & communication | 2026 |
| Kajin Brands Limited | Wholesale & retail | 2025 |
| Kakapeople Ltd | Wholesale & retail | 2025 |
| Kali Fish Bar Ltd | Hospitality | 2026 |
| Kalira Medical Limited | Information & communication | 2026 |
| Kalm With Katie Ltd | Arts & recreation | 2025 |
| Kaloosh Associates Limited | Financial services | 2002 |
| Kalsec Europe Ltd | Manufacturing | 1995 |
| Kamaiverse Ltd | Information & communication | 2026 |
| Kamavs Ltd | Other services | 2024 |
| Kamerton Consulting Ltd | Professional & scientific | 2024 |
| Kamrit Investments Ltd | Real estate | 2020 |
| Kanahya Ltd | Real estate | 2024 |
| Kanbi Limited | Information & communication | 2008 |
| Kanda Project Ltd | Information & communication | 2023 |
| Kandybrew Beverages Limited | Manufacturing | 2025 |
| Kanex Ltd | Construction | 2019 |
| Kanku Consulting Limited | Professional & scientific | 2014 |
| Kanpeki Digital Ltd | Professional & scientific | 2023 |
| Kaon Solutions Ltd | Professional & scientific | 2025 |
| Kaosar Empire Ltd | Manufacturing | 2024 |
| Kapembwa Financial Ltd | Professional & scientific | 2022 |
| Kapitl Business Finance Limited | Financial services | 2026 |
| Kaplancuk Ltd | Wholesale & retail | 2023 |
| Kapow Completely Ltd | Extraterritorial | 2025 |
| Kapsul Limited | Wholesale & retail | 2025 |
| Kar-Mar Cleaning Ltd. | Transport & logistics | 2016 |
| Karad Integrated Systems UK Ltd | Information & communication | 2018 |
| Karak Chai House Ltd | Hospitality | 2025 |
| KARAN27 Limited | Hospitality | 2026 |
| Karen DYE Ltd | Administrative & support | 2014 |
| Karen Jones Travel Ltd | Administrative & support | 2024 |
| Karen Patten Limited | Professional & scientific | 2011 |
| Karmalink Ltd | Information & communication | 2025 |
| Karnak Ltd | Real estate | 2023 |
| Karooze Limited | Hospitality | 2017 |
| Karrera Limited | Hospitality | 2015 |
| Karrotkare Ltd | Health & social care | 2025 |
| Kartepay Technologies PVT Ltd | Information & communication | 2017 |
| Kashibu Property Ltd | Real estate | 2024 |
| Kashira Consulting Limited | Professional & scientific | 2025 |
| Kasino Ltd | Construction | 2023 |
| Kaski Motors Limited | Wholesale & retail | 2023 |
| Kasunmu Ltd | Information & communication | 2026 |
| KAT Foods Ltd | Hospitality | 2025 |
| Kata UK Limited | Professional & scientific | 1995 |
| Kate Hulme Ltd | Administrative & support | 2010 |
| Katerina Novakova Coaching Limited | Health & social care | 2025 |
| Kawfi Limited | Information & communication | 2023 |
| KAY Glammas Kitchen Ltd | Hospitality | 2025 |
| Kaya Faris Group Ltd | Wholesale & retail | 2026 |
| Kaya Labs Ltd | Wholesale & retail | 2025 |
| Kaysun Trading Limited | Wholesale & retail | 2023 |
| KAZ Complete Cleaning Ltd | Administrative & support | 2025 |
| KB Automotive Ltd | Professional & scientific | 2025 |
| KB Marine Engineering Ltd | Manufacturing | 2022 |
| Kbenaire Ltd | Information & communication | 2024 |
| KCC Autos Limited | Administrative & support | 2008 |
| Kcphysiques Ltd | Other services | 2022 |
| KCR Autos Ltd | Wholesale & retail | 2025 |
| KDF Consulting Ltd | Financial services | 2025 |
| KDM Risk Control Limited | Financial services | 2025 |
| KDT Property Limited | Real estate | 2017 |
| KE Financial Ltd | Professional & scientific | 2022 |
| Keazy Group Ltd | Wholesale & retail | 2024 |
| KEE Capital Holdings Limited | Real estate | 2025 |
| Keeler Consultancy Ltd | Education | 2016 |
| Keely KAY Limited | Professional & scientific | 2015 |
| Keep Listening Ltd | Professional & scientific | 2025 |
| Keep the Faith Limited | Information & communication | 2009 |
| Keephysique Ltd | Other services | 2020 |
| Keeping IT Keels Ltd | Information & communication | 2025 |
| Keir Property Investment Limited | Real estate | 2024 |
| Keith Mount (Liming) Limited | Agriculture & fishing | 1992 |
| Kelham Construction Ltd | Construction | 2015 |
| Keller Corporation Ltd | Wholesale & retail | 2020 |
| Kelly Cuesta Ltd | Professional & scientific | 2020 |
| Kels Images Limited | Manufacturing | 2025 |
| Kelsey Deal Sourcing Ltd | Administrative & support | 2025 |
| KELVIN2E Ltd | Professional & scientific | 2026 |
| Kemp Financial Consultancy Limited | Financial services | 2026 |
| Kempers Property Management Limited | Real estate | 2017 |
| Kemptown Mews Residents Association Limited | Households | 1996 |
| Kename Sport Ltd | Information & communication | 2026 |
| Kendon Safety Ltd | Professional & scientific | 2016 |
| Kennedy MOTORSP0RT Ltd | Professional & scientific | 2025 |
| Kennyi Ltd | Wholesale & retail | 2026 |
| Kensington & Sutton Ltd | Professional & scientific | 2025 |
| Kensington Premier Property Services Ltd | Real estate | 2026 |
| Kent Gunsmiths Limited | Manufacturing | 2018 |
| Kent Gynaecology Ltd | Health & social care | 2009 |
| Kent Mobile Medical Ltd | Health & social care | 2008 |
| Kentford Service Station Limited | Extraterritorial | 2016 |
| Kentish Cakes Ltd | Hospitality | 2013 |
| Kenvogue UK Ltd | Manufacturing | 2025 |
| Kenya Trading Ltd | Manufacturing | 2015 |
| Kenz Innovations Ltd | Wholesale & retail | 2025 |