| Kaizen Compliance Solutions Limited | Other services | 2014 |
| Kaizen QI Ltd | Professional & scientific | 2024 |
| Kaizen Supplier Ltd | Wholesale & retail | 2024 |
| Kaje Property Ltd | Real estate | 2025 |
| Kajeff Limited | Wholesale & retail | 2021 |
| Kakero Ngaturijame Limited | Public administration | 2025 |
| Kako Propertes Ltd | Real estate | 2022 |
| Kaktus INK Ltd | Information & communication | 2021 |
| Kalabakra Limited | Wholesale & retail | 2024 |
| Kalabary Sales Ltd | Wholesale & retail | 2024 |
| Kalakeche Properties Ltd | Construction | 2019 |
| Kalam Services Ltd | Other services | 2017 |
| Kalambo Ltd | Information & communication | 2018 |
| Kalaprith Limited | Wholesale & retail | 2017 |
| Kale & BEE Ltd | Wholesale & retail | 2015 |
| Kaleemspire Ltd | Wholesale & retail | 2025 |
| Kaleidoscope Project | Health & social care | 2005 |
| Kalejdoscope CIC | Education | 2024 |
| Kalen Holden & Partners Limited | Financial services | 2023 |
| Kalevala Gold (UK) Limited | Professional & scientific | 2024 |
| Kaliante Radiators Limited | Wholesale & retail | 2010 |
| Kalikio Services Ltd | Public administration | 2020 |
| Kalimantan Construction Ltd | Construction | 2019 |
| Kalin Cleaning Services Ltd | Administrative & support | 2019 |
| Kalkan Holiday Property Ltd | Hospitality | 2020 |
| Kalker UK Limited | Wholesale & retail | 1993 |
| Kalkhof Virtus | Information & communication | 2023 |
| Kall Consultancy Ltd | Information & communication | 2019 |
| Kallos Aesthetics Limited | Other services | 2025 |
| Kallos Beauty Aesthetics Ltd | Other services | 2025 |
| Kalm Consultancy Services Limited | Construction | 2022 |
| Kalon Hair Studio Ltd | Other services | 2020 |
| Kalp Media PVT Ltd | Information & communication | 2026 |
| Kalpten Ltd | Hospitality | 2019 |
| Kalrez Communication Ltd | Information & communication | 2012 |
| Kaluda Ltd | Real estate | 2012 |
| Kalum Bodywork Ltd | Manufacturing | 2012 |
| Kalvara Equestrian Ltd | Wholesale & retail | 2026 |
| Kalvero Ltd | Wholesale & retail | 2026 |
| Kalyan Estates Limited | Real estate | 2024 |
| Kalypsso PLC | Information & communication | 2019 |
| KAM Property Holding Ltd | Real estate | 2024 |
| KAM TAN Limited | Real estate | 2000 |
| KAM YIN Properties Limited | | 1978 |
| Kam.E.Resells Limited | Wholesale & retail | 2026 |
| Kamal & Co Ltd | Professional & scientific | 2011 |
| Kamda Limited | Construction | 2020 |
| Kamenov SD Limited | Construction | 2020 |
| Kameran Dylan Ltd | Hospitality | 2024 |
| Kamfilm Limited | Information & communication | 2018 |
| Kami RAO Ltd | Wholesale & retail | 2025 |
| Kamigo Moon Ltd | Other services | 2025 |
| Kamil Struzynski Limited | Construction | 2020 |
| KAMILR1983 Limited | Administrative & support | 2024 |
| Kamir and Indy Enterprises Limited | Health & social care | 2016 |
| Kamms Heating & Plumbing Ltd | Energy | 2019 |
| Kampac International PLC | Mining & quarrying | 2008 |
| Kamraj Development Ltd | Construction | 2024 |
| Kamson LUX Ltd | Administrative & support | 2014 |
| Kamvan Ltd | Hospitality | 2022 |
| Kanay Commercial Ltd | Energy | 2022 |
| Kanay Group Limited | Hospitality | 2020 |
| Kanchris Dignity Care Ltd | Health & social care | 2026 |
| Kandiah Group Limited | Professional & scientific | 2019 |
| KANDO4U Ltd | Administrative & support | 2018 |
| Kandola Logistics Synergy Limited | Transport & logistics | 2019 |
| Kands London 1 Ltd | Wholesale & retail | 2019 |
| Kangaroo Court Coffee House Ltd. | Hospitality | 2018 |
| Kangyu Ventures PC | | 2021 |
| Kankon Ltd | Construction | 2021 |
| Kannada Enthusiasts CIC | Education | 2020 |
| Kant 49 Investment Ltd | Financial services | 2017 |
| Kanto Vault Limited | Wholesale & retail | 2025 |
| Kantoforge Ltd | Arts & recreation | 2023 |
| Kantonix Ltd | Education | 2025 |
| Kanx Investments Limited | Real estate | 2018 |
| Kanzlei Freiherr VON DEM Bussche-Haddenhausen Limited | Administrative & support | 2013 |
| Kaoshi Ltd | Information & communication | 2020 |
| KAP Foods Ltd | Transport & logistics | 2005 |
| Kapala Limited | Wholesale & retail | 2025 |
| Kape Bay Limited | Health & social care | 2014 |
| Kapital Estates Ltd | Real estate | 2005 |
| Kapital Payment Ltd | Financial services | 2019 |
| Kapoor Sysyems Ltd | Wholesale & retail | 2026 |
| Kaprelo Solutions Ltd | Administrative & support | 2021 |
| Kaptan and Unwin Limited | Wholesale & retail | 2026 |
| Kara Mills Ltd | Wholesale & retail | 2018 |
| Karacson Transport Limited | Transport & logistics | 2015 |
| Karadas Ltd | Wholesale & retail | 2025 |
| Karagahgadget Ltd | Wholesale & retail | 2024 |
| Karahanli Ltd | Wholesale & retail | 2024 |
| Karakeci TIC Ltd | Wholesale & retail | 2025 |
| Karan Builders Limited | Construction | 2025 |
| Karan Payho Ltd | Professional & scientific | 2025 |
| Karan Payrol Ltd | Professional & scientific | 2025 |
| Karan Pays Ltd | Professional & scientific | 2025 |
| Karan Tripayro Ltd | Professional & scientific | 2025 |
| Karan Trisec Ltd | Professional & scientific | 2025 |
| Karan's Cove Ltd | Wholesale & retail | 2025 |
| Karate Kids Cardiff Limited | Education | 2019 |