| K J Webb Heating & Plumbing Engineers Limited | Construction | 2008 |
| K K Bullen Holdings Limited | Financial services | 2023 |
| K L Arnold Ltd | Financial services | 2016 |
| K L K Solutions Ltd | Information & communication | 2022 |
| K O & P Property Ltd | Real estate | 2022 |
| K S Security Limited | Administrative & support | 1988 |
| K S Sehgal Investments Ltd | Financial services | 2022 |
| K West Transport Limited | Transport & logistics | 2018 |
| K Yadav Property Ltd | Real estate | 2021 |
| K&Dees Limited | Transport & logistics | 2018 |
| K&K Hursthouse Engineering Ltd Limited | Construction | 2014 |
| K-Commerce Ltd | Wholesale & retail | 2025 |
| K. Rackham & SON Engineering Ltd | Manufacturing | 2008 |
| K.A. Hockley & Sons Ltd | Construction | 1985 |
| K.B. Properties (Norfolk) Ltd | Real estate | 2015 |
| K.C. Counts Limited | Professional & scientific | 2009 |
| K.D.B Convenience Stores Ltd | Wholesale & retail | 2025 |
| K.Long Consulting Limited | Education | 2019 |
| K.O.R Trading Ltd | Wholesale & retail | 2024 |
| K.S.C Contracting Ltd | Professional & scientific | 2023 |
| K.Scott Properties Limited | Real estate | 1954 |
| K2 Air Services Limited | Administrative & support | 1998 |
| K4 Diamond Properties Ltd | Real estate | 2024 |
| K4U Solutions Limited | Wholesale & retail | 2019 |
| K9 Labs Limited | Extraterritorial | 2015 |
| K@Tie Consults Limited | Professional & scientific | 2009 |
| KA Haulage Ltd | Transport & logistics | 2014 |
| KA Logistics Bham Ltd | Transport & logistics | 2016 |
| KA Manpower Limited | Administrative & support | 2020 |
| Kada Designs Limited | Information & communication | 2012 |
| Kadans Science Partner 11 UK Limited | Real estate | 2022 |
| Kadans Science Partner 1 UK Limited | Real estate | 2019 |
| Kadans Science Partner 10 UK Limited | Real estate | 2021 |
| Kadans Science Partner 12 UK Limited | Real estate | 2022 |
| Kadans Science Partner 14 UK Limited | Real estate | 2022 |
| Kadans Science Partner 15 UK Limited | Real estate | 2022 |
| Kadans Science Partner 16 UK Limited | Real estate | 2023 |
| Kadans Science Partner 17 UK Limited | Real estate | 2023 |
| Kadans Science Partner 18 UK Limited | Real estate | 2023 |
| Kadans Science Partner 2 UK Limited | Real estate | 2019 |
| Kadans Science Partner 3 UK Limited | Real estate | 2019 |
| Kadans Science Partner 4 UK Limited | Real estate | 2020 |
| Kadans Science Partner 5 UK Limited | Real estate | 2021 |
| Kadans Science Partner 6 UK Limited | Real estate | 2021 |
| Kadans Science Partner 7 UK Limited | Construction | 2018 |
| Kadans Science Partner 8 UK Limited | Real estate | 2021 |
| Kadans Science Partner 9 UK Limited | Real estate | 2021 |
| Kadans Science Partner UK Holding Limited | Real estate | 2021 |
| Kadans Science Partner UK Limited | Real estate | 2019 |
| Kadans Science Partner UK Services Limited | Administrative & support | 2020 |
| KAG Consultancy Ltd | Information & communication | 2022 |
| Kagatha Ltd | Arts & recreation | 2023 |
| Kagend Ltd | Energy | 2011 |
| Kagenova Limited | Information & communication | 2017 |
| Kaidi International Culture Ltd | Education | 2017 |
| Kaimeh Supply Co. Ltd | Wholesale & retail | 2026 |
| Kainos International Limited | Financial services | 2008 |
| Kairbeech Limited | Real estate | 1982 |
| Kaizen Chiropractic Limited | Health & social care | 2014 |
| Kaizen Solutions Group Limited | Professional & scientific | 2024 |
| Kaizen Ventures Ltd | Professional & scientific | 2026 |
| Kaizeu Limited | Professional & scientific | 2018 |
| Kaja Steel Services Limited | Construction | 2012 |
| Kajam Media Limited | Professional & scientific | 2018 |
| Kajapharma Limited | Wholesale & retail | 2024 |
| KAK Trading Ltd | Wholesale & retail | 2012 |
| Kakawa Artisan Chocolate & Co Ltd | Manufacturing | 2020 |
| KAL Films Ltd | Professional & scientific | 2025 |
| KALA29 Ltd | Construction | 2026 |
| Kalbiya Limited | Manufacturing | 2026 |
| Kaleva Ltd | Information & communication | 2023 |
| Kaliba Marketing Limited | Professional & scientific | 2003 |
| Kalliopi Tseliou Ltd | Health & social care | 2026 |
| KAM HON ( Norwich) Ltd | Hospitality | 2018 |
| KAM LEE 2021 Ltd | Hospitality | 2021 |
| Kamarina 2 Limited | Real estate | 2014 |
| Kamawho Ltd | Health & social care | 2014 |
| Kamrad Ltd | Extraterritorial | 2017 |
| Kanag Ltd | Wholesale & retail | 2023 |
| Kanagpilli Ltd | Real estate | 2026 |
| Kanbosk Business Services Limited | Administrative & support | 2012 |
| Kancon Construction Ltd | Construction | 2003 |
| Kanha Caterers Ltd | Hospitality | 2023 |
| Kanndoo C.I.C. | Health & social care | 2017 |
| Kantam Properties Limited | Real estate | 2024 |
| KAP Services (Norwich) Limited | Professional & scientific | 2014 |
| KAP4 Limited | Professional & scientific | 2010 |
| Kapil Abundance Limited | Wholesale & retail | 2025 |
| Kapla IT Ltd | Information & communication | 2024 |
| Kapla Trading Ltd | Wholesale & retail | 2024 |
| Kapr Living Ltd | Real estate | 2026 |
| Kaptin Spices Limited | Hospitality | 2019 |
| Kapturo Ltd | Real estate | 2014 |
| Karandila - Giants Ltd | Wholesale & retail | 2024 |
| Karbar Services Ltd | Construction | 2019 |
| Karen Eason Certified Accountant Limited | Professional & scientific | 2017 |
| Karen Wortley Limited | Real estate | 2000 |
| Karin Dewing Ltd | Health & social care | 2022 |
| Karismatic Limited | Professional & scientific | 2018 |
| Karken Healthcare Ltd | Health & social care | 2026 |