| Kixx Leeds West Yorkshire Ltd | Education | 2023 |
| Kixx Sheff Ltd | Education | 2018 |
| Kixx York Ltd | Education | 2019 |
| KJ Contracts Yorkshire Ltd | Construction | 2021 |
| KJ Cues Ltd | Manufacturing | 2025 |
| KJ Fabrications Limited | Manufacturing | 2010 |
| KJC Homes Ltd | Real estate | 2023 |
| KJC Sales&Marketing Limited | Wholesale & retail | 2023 |
| KJH Fabrications Limited | Manufacturing | 2026 |
| Kjka Media Limited | Professional & scientific | 2024 |
| KJL Smart Business Solutions Ltd | Administrative & support | 2018 |
| Kjpet Co Ltd | Information & communication | 2026 |
| KJS Studio Limited | Arts & recreation | 2024 |
| KJT Promotions Limited | Professional & scientific | 2016 |
| KK Bawtry Ltd | Hospitality | 2025 |
| KKE Transport Services Limited | Transport & logistics | 2018 |
| Kkmp Ltd | Real estate | 2019 |
| KKR Property Solutions Ltd | Construction | 2024 |
| KKW Homes Ltd | Administrative & support | 2023 |
| KL Advanced Medical Cosmetics Ltd | Health & social care | 2016 |
| KL Convenience Store Limited | Wholesale & retail | 2021 |
| KL Enterprise Group Ltd | Hospitality | 2016 |
| KL Skin Clinic Limited | Professional & scientific | 2021 |
| Klaisen Ltd | Water & waste | 2018 |
| KLB Accounts Limited | Professional & scientific | 2023 |
| KLC Financial Services Limited | Financial services | 2023 |
| KLC Plastering Ltd | Construction | 2019 |
| KLE Sign Solutions Ltd. | Manufacturing | 2015 |
| Klear Commercial Services Limited | Administrative & support | 2016 |
| KLK Corp Ltd | Transport & logistics | 2026 |
| KLM International Ltd | Transport & logistics | 2018 |
| KLM Legal Services Ltd | Professional & scientific | 2018 |
| Klobber Limited | Wholesale & retail | 2019 |
| KLR Property Rentals Ltd | Real estate | 2024 |
| KLS Productions Ltd | Administrative & support | 2024 |
| KLS Rentals Ltd | Real estate | 2025 |
| Klsandco Ltd | Other services | 2025 |
| KLT Medics Ltd | Health & social care | 2017 |
| KLW Estates Limited | Real estate | 2025 |
| KLW Properties Limited | Real estate | 2020 |
| Klyro Dynamics Ltd | Extraterritorial | 2026 |
| KM Sales Distribution Ltd | Wholesale & retail | 2026 |
| KM Smart Haulage Ltd | Transport & logistics | 2025 |
| KMB Housing Limited | Real estate | 2025 |
| KMB Training Limited | Administrative & support | 2023 |
| Kmeec Ltd | Construction | 2026 |
| KMP Medical Services Limited | Health & social care | 2022 |
| KMP Trans Ltd | Transport & logistics | 2026 |
| Kmslmedical Ltd | Health & social care | 2025 |
| Knarly Ltd | Wholesale & retail | 2020 |
| Knight Knight Limited | Construction | 2021 |
| Knight Scaffolding Ltd | Construction | 2011 |
| Knight Sportswear Ltd | Wholesale & retail | 2015 |
| Knighton SPV1 Limited | Real estate | 2025 |
| Knights Network Limited | Information & communication | 2023 |
| Knights Store Ltd | Transport & logistics | 2019 |
| Knightsbridge Properties & Developments Ltd | Real estate | 2000 |
| Knock OUT Beds Ltd | Extraterritorial | 2023 |
| Knot & Grain Design Co Ltd | Arts & recreation | 2024 |
| Knowledge Pool Ltd | Information & communication | 2019 |
| KNR Technology Limited | Manufacturing | 1995 |
| KNS Support Services Ltd | Administrative & support | 2020 |
| Knshospitalitygroup Ltd | Hospitality | 2026 |
| KO Engineering Services Ltd | Construction | 2017 |
| KO KO Tree Ltd | Hospitality | 2020 |
| KO Milan Ltd | Transport & logistics | 2023 |
| Koala Smart Sensors Ltd | Professional & scientific | 2023 |
| Kobra Security Ltd | Administrative & support | 2021 |
| Kobrakai Limited | Financial services | 2021 |
| Koco Okkes Limited | Hospitality | 2024 |
| Kocolar Estate Limited | Real estate | 2024 |
| Kodor Ltd | Transport & logistics | 2021 |
| Kodu Ltd | Real estate | 2022 |
| Kokob Shop Limited | Hospitality | 2025 |
| Kolbak Ltd | Professional & scientific | 2025 |
| Komplementar Ltd | Financial services | 2022 |
| Konark Limited | Financial services | 2007 |
| Koncept Rail Solutions Global Limited | Professional & scientific | 2024 |
| Konfederacja Ltd | Transport & logistics | 2014 |
| Konradlogistics Ltd | Transport & logistics | 2018 |
| Kore Games Ltd | Manufacturing | 2021 |
| Koros Automotive Services Ltd | Wholesale & retail | 2026 |
| Kosa Trans Ltd | Transport & logistics | 2015 |
| Koshnaw Mini Market Doncaster Ltd | Wholesale & retail | 2025 |
| Kotuoba 27 Limited | Hospitality | 2024 |
| Kova Kitchen Ltd | Manufacturing | 2025 |
| Kovac Engineering Ltd | Professional & scientific | 2025 |
| KP Site Services Limited | Construction | 2026 |
| KP Smart Holding Limited | Financial services | 2022 |
| KP Surveys Ltd | Professional & scientific | 2019 |
| KP20 CRE Services Limited | Administrative & support | 2022 |
| Kpcm Proprietary Holdings Limited | Real estate | 2020 |
| Kpcm Residential Holdings Ltd | Real estate | 2023 |
| Kppn Limited | Health & social care | 2010 |
| KPR Properties & Maintenance Limited | Other services | 2025 |
| Kraft Lighting Ltd | Wholesale & retail | 2023 |
| Kraft Systems Ltd | Construction | 2024 |
| Kraine (Holdings) Ltd | Real estate | 2022 |
| Kraine Limited | Construction | 2012 |
| Kraszewski Transport Ltd | Transport & logistics | 2015 |