| KF Industry Co., Ltd | Extraterritorial | 2022 |
| KFI Holding Limited | Wholesale & retail | 2024 |
| KFM Contracts Ltd | Construction | 2018 |
| KG Asia Group Ltd | Wholesale & retail | 2023 |
| KGC Glass Co., Ltd. | Professional & scientific | 2016 |
| KGT Training Ltd | Education | 2019 |
| Khartle Ltd | Professional & scientific | 2020 |
| KHO KHO Ltd | Wholesale & retail | 2024 |
| Kibayoma International Co., Ltd | Extraterritorial | 2025 |
| Kids in Kathmandu Nepal Ltd | Education | 2011 |
| Kidspire Living Limited | Health & social care | 2025 |
| Kifus Top Cosmetics Co., Ltd | Extraterritorial | 2013 |
| Kilderkin Developments Limited | Real estate | 1992 |
| Kilima Energy Solutions Limited | Wholesale & retail | 2025 |
| Kimdan Co Limited | Transport & logistics | 2005 |
| Kimmm Limited | Health & social care | 2023 |
| Kimton Construction Co., Ltd | Manufacturing | 2024 |
| KIN Bright Industry Limited | Extraterritorial | 2019 |
| KIN Top Commerce and Trade Limited | Wholesale & retail | 2021 |
| Kin-Zoule Ltd | Extraterritorial | 2011 |
| Kinbody Sports Goods Co., Ltd | Manufacturing | 2023 |
| Kincora Management Limited | Real estate | 1986 |
| Kind Unity Group Ltd | Extraterritorial | 2009 |
| Kind&Grace Pet Products Co., Ltd | Extraterritorial | 2018 |
| Kineon Sustainable Technology LAB | Manufacturing | 2026 |
| Kinetimat Ltd | Wholesale & retail | 2025 |
| Kingfisheries Aquarium Limited | Wholesale & retail | 1974 |
| Kingo Development Enterprise Limited | Professional & scientific | 2010 |
| Kingsley-Perkins Ltd | Administrative & support | 2025 |
| Kingsmere Drive Management Company Limited | Real estate | 2010 |
| Kingway Electronics Co., Ltd | Extraterritorial | 2013 |
| Kinrin Development Co., Ltd | Extraterritorial | 2013 |
| Kinsley Associates Limited | Information & communication | 2013 |
| Kinson Hair Studio Ltd | Other services | 2023 |
| Kinsun Stainless Steel Co., Ltd | Extraterritorial | 2014 |
| Kintran Chemical Industry Co., Limited | Extraterritorial | 2010 |
| Kinway Car Accessories Ltd | Extraterritorial | 2021 |
| Kira Independent Limited | Health & social care | 2013 |
| Kiri’S Narrative Studio Ltd | Professional & scientific | 2025 |
| Kirkbriar Limited | Real estate | 1995 |
| Kirkdale Supplies,Limited | Real estate | 1934 |
| Kischem Group Co., Ltd | Extraterritorial | 2018 |
| Kisetsusha Holding Capital Limited | Financial services | 2021 |
| Kita Tiling and Groundworks Limited | Construction | 2019 |
| Kitten PUP Ltd | Manufacturing | 2025 |
| Kixin IMP and EXP Co., Ltd | Manufacturing | 2025 |
| KJB Scaffolding Ltd | Construction | 2022 |
| KJS Electrical Services Limited | Professional & scientific | 1997 |
| Kj’S Developments Group Limited | Construction | 2019 |
| Klan Technology Ltd | Extraterritorial | 2017 |
| KLC London Limited | Professional & scientific | 2012 |
| Klex Metal Wire Mesh Co., Limited | Extraterritorial | 2018 |
| Klikkon Industrial Co., Ltd | Extraterritorial | 2013 |
| Klima Haus Limited | Construction | 2023 |
| KM Industrial Co., Ltd. | Extraterritorial | 2016 |
| KMI Transport Ltd | Transport & logistics | 2025 |
| Knapton's Non-Alcoholic Spirits Limited | Manufacturing | 2025 |
| Kneluchi Ltd | Hospitality | 2023 |
| Knife + Fork Ltd | Professional & scientific | 2025 |
| Knight Security Systems Limited | Administrative & support | 1997 |
| Knights Karate Ltd | Arts & recreation | 2026 |
| Knoll House (Beckenham) Limited | Real estate | 2012 |
| Koahde Co., Ltd | Extraterritorial | 2025 |
| Kobisan Enterprises Ltd | Hospitality | 2026 |
| Koceku Global Ltd | Wholesale & retail | 2026 |
| Koch & Brook Technology Co., Limited | Extraterritorial | 2022 |
| Koen Building Material Co., Ltd. | Extraterritorial | 2020 |
| Kohhy Trading Ltd | Manufacturing | 2025 |
| Koka Industrial Equipment Co., Ltd. | Wholesale & retail | 2020 |
| Komodo International Trade Co., Ltd. | Extraterritorial | 2020 |
| Komotif Limited | Professional & scientific | 2005 |
| Komsia Investment Ltd | Real estate | 2024 |
| Konnx UK Ltd | Manufacturing | 2021 |
| Konvier Group Limited | Extraterritorial | 2016 |
| Kopite Systems Limited | Information & communication | 2018 |
| Korath Ltd | Hospitality | 2025 |
| Korea Kangpusheng Crop Nutrition Ltd | Extraterritorial | 2024 |
| Korea Xianzhi Chemical Zhushihuishe (International) Import & Export Ltd | Extraterritorial | 2023 |
| Korea Yushan Plant Protect Co., Ltd | Extraterritorial | 2021 |
| Koreyoshi Ltd | Wholesale & retail | 2017 |
| Korgotch UK Ltd | Wholesale & retail | 2024 |
| Koroma Trading Co., Limited | Wholesale & retail | 2021 |
| Korona Importing Corporation Ltd. | Real estate | 2004 |
| Korsentek Ltd | Manufacturing | 2020 |
| Koru Sports Group Limited | Arts & recreation | 2023 |
| Koyu Automotive Technology (Thailand) Co., Ltd. | Extraterritorial | 2023 |
| KP Catering Ltd | Hospitality | 2023 |
| KP Development Services Limited | Real estate | 2005 |
| KPA & SC Consultants Ltd | Other services | 2015 |
| KRA Building Services Ltd | Construction | 2011 |
| KRH London Markets Limited | Financial services | 2025 |
| Krippner Limited | Information & communication | 2013 |
| Krishnans Limited | Health & social care | 2011 |
| Krislemi Group Co., Ltd | Manufacturing | 2022 |
| Krousti Ltd | Real estate | 2022 |
| Kruger Construction Services Ltd | Construction | 2014 |
| Kruise Energy Service Co., Ltd. | Wholesale & retail | 2026 |
| Krys Trade Ltd | Professional & scientific | 2014 |
| KS Diesel UK Ltd | Extraterritorial | 2015 |
| KS Energy Batteries Ltd | Manufacturing | 2023 |