| KA Facilities (Bedford) Limited | Hospitality | 2012 |
| KAD Property Investments Ltd | Real estate | 2025 |
| Kadami Ltd | Other services | 2022 |
| Kade Hair Ltd | Wholesale & retail | 2025 |
| Kaden Fire Safety Consultants Ltd | Financial services | 2024 |
| Kaden Fire Safety Training Ltd | Public administration | 2024 |
| Kadj Limited | Real estate | 2025 |
| Kadmatek Limited | Information & communication | 2008 |
| Kafvent Ltd | Information & communication | 2018 |
| Kaia & Chai Properties Limited | Real estate | 2023 |
| Kaiaisha Consulting Limited | Information & communication | 2019 |
| Kaimach Limited | Information & communication | 1999 |
| Kainco Limited | Health & social care | 2022 |
| Kaizen Clinic Limited | Other services | 2011 |
| Kaizen Culture LLP | | 2018 |
| Kaizen Homeopathic Supplies Ltd | Wholesale & retail | 2013 |
| Kaizen Industrial Group Ltd | Administrative & support | 2003 |
| Kaja General Property Services Ltd | Construction | 2020 |
| Kajeta Limited | Professional & scientific | 2011 |
| Kaka Super Shop Limited | Wholesale & retail | 2024 |
| Kake Digital Limited | Information & communication | 2014 |
| Kakria Properties Ltd | Real estate | 2026 |
| Kaks Logistics Ltd | Transport & logistics | 2021 |
| KAL Ratcliffe Nutrition Limited | Health & social care | 2020 |
| Kalenderson Ltd | Transport & logistics | 2016 |
| Kaler Logistics Limited | Transport & logistics | 2024 |
| Kalkat Transport Ltd | Transport & logistics | 2026 |
| Kallak Limited | Health & social care | 2024 |
| Kalree Ltd | Information & communication | 2025 |
| Kaltenbach Limited | Wholesale & retail | 1973 |
| Kalyan Consultancy Ltd | Professional & scientific | 2024 |
| Kalyan Investments Limited | Real estate | 2017 |
| KAM Car Sales Ltd | Wholesale & retail | 2021 |
| Kamal Holdings Limited | Real estate | 2023 |
| Kamili Villas Limited | Hospitality | 2023 |
| Kamini Creations Ltd | Manufacturing | 2026 |
| Kamkam Logistics Ltd | Transport & logistics | 2025 |
| Kamklo Limited | Transport & logistics | 2015 |
| Kampf Machinery UK Limited | Manufacturing | 1976 |
| Kams Consultancy Limited | Professional & scientific | 2022 |
| Kamuk Ltd | Administrative & support | 2024 |
| Kanacherry Limited | Real estate | 2021 |
| Kane Electrical and Property Refurbishment Services Ltd | Construction | 2015 |
| Kanfind Solutions Limited | Information & communication | 2012 |
| Kanhar Services Ltd | Wholesale & retail | 2020 |
| Kanungo Holdings Ltd | Financial services | 2022 |
| Kanungo Properties Ltd | Real estate | 2018 |
| KAO Hospitality Limited | Arts & recreation | 2023 |
| Kaptain Estate Limited | Real estate | 2021 |
| Kaptain UK Limited | Construction | 2013 |
| KAR Properties Limited | Real estate | 2022 |
| Kara Solutions Ltd | Real estate | 2020 |
| Karak Chaii Bedford Ltd | Hospitality | 2023 |
| Karbon Creative Ltd | Professional & scientific | 2019 |
| Karbon Holdings Limited | Financial services | 2024 |
| Karbon Rentals LLP | | 2024 |
| Karbonica Ltd | Manufacturing | 2022 |
| Karel Healthcare Limited | Health & social care | 2018 |
| Karen Crichton Limited | Arts & recreation | 2004 |
| Karen Hayward Limited | Other services | 2009 |
| Karen House Management Company Limited | Households | 1995 |
| Karis Foodshopper Limited | Wholesale & retail | 2026 |
| Karith Engineering Limited | Manufacturing | 2008 |
| Karith Solutions Limited | Manufacturing | 2002 |
| Karjen Cleaning Services Company Ltd | Administrative & support | 2019 |
| Karl Accounting Ltd | Professional & scientific | 2018 |
| Karo Beauty Club Ltd | Other services | 2022 |
| Kartar Jhingran Ltd | Households | 2018 |
| Kartoa Technologies Ltd | Information & communication | 2021 |
| Karuna Enterprises Limited | Manufacturing | 1975 |
| Karzone Limited | Wholesale & retail | 2023 |
| KAS Retail Connect Buchan Ltd | Wholesale & retail | 2025 |
| KAS Retail Connect Ltd | Wholesale & retail | 2025 |
| KAS Retail Connect Penn Ltd | Wholesale & retail | 2025 |
| KAS Softech Limited | Information & communication | 2026 |
| Kasanel Properties Ltd | Real estate | 2024 |
| Kasbe & Co Ltd | Real estate | 2025 |
| Kasbe Properties Ltd | Real estate | 2026 |
| Kash Property Management Limited | Real estate | 2022 |
| Kashar Ltd | Wholesale & retail | 2019 |
| Kashmir Peri Peri Grill and Pizza Limited | Hospitality | 2025 |
| Kassa Consultancy Ltd | Professional & scientific | 2021 |
| Kasztelan Ltd. | Wholesale & retail | 2014 |
| Kat&Maz Ltd | Wholesale & retail | 2021 |
| Katcan Limited | Professional & scientific | 2012 |
| Kate Joseph Bridal Ltd | Wholesale & retail | 2017 |
| Kateri Clinic Ltd | Health & social care | 2023 |
| Katie H Consulting Ltd | Professional & scientific | 2025 |
| Katie Harvey Mindmastery Ltd | Financial services | 2024 |
| Kaurtec Limited | Information & communication | 2011 |
| Kaushal Property Management LLP | | 2023 |
| Kavanagh Brothers Limited | Administrative & support | 2014 |
| Kavanagh Data Ltd | Information & communication | 2024 |
| Kavanos Ltd | Hospitality | 2022 |
| Kaver Laminates Limited | Manufacturing | 2009 |
| Kavlar Limited | Public administration | 2022 |
| KAY KEH Business Consulting Ltd | Information & communication | 2015 |
| Kaya Plumbing and Heating Ltd | Construction | 2020 |
| Kazbar Systems Limited | Wholesale & retail | 2009 |
| Kazoku Investments Limited | Real estate | 2021 |