| Kang Brothers Transport Ltd | Transport & logistics | 2021 |
| Kapital Exports (UK) Limited | Extraterritorial | 2014 |
| Kappiko Ltd | Real estate | 2024 |
| Karachi Street Food Ltd | Hospitality | 2024 |
| Karaiz Ltd | Wholesale & retail | 2025 |
| Karakoram Global Holdings Limited | Professional & scientific | 2020 |
| Karakoram Innovation Limited | Health & social care | 2020 |
| Karakoram Products Limited | Wholesale & retail | 2020 |
| Karakoram Skincare Limited | Health & social care | 2020 |
| Karakoram Technologies Limited | Health & social care | 2020 |
| Karakoram Wellbeing Centres Limited | Health & social care | 2020 |
| Karan HGV Ltd | Transport & logistics | 2019 |
| Kardia Living Ltd | Health & social care | 2025 |
| Karku Property Rentals Ltd | Real estate | 2025 |
| Karl Henry Academy Ltd | Arts & recreation | 2021 |
| Karo Holdings Limited | Wholesale & retail | 2019 |
| Karparts Limited | Manufacturing | 2003 |
| Karunwi Global Limited | Administrative & support | 2026 |
| Karu’S OFF License Ltd | Wholesale & retail | 2017 |
| Kasablankapm Ltd | Construction | 2024 |
| Kasba Enterprise Ltd | Hospitality | 2017 |
| Kashmir Goods Ltd | Wholesale & retail | 2019 |
| Katelee Services Ltd | Construction | 2010 |
| Katman Group Limited | Financial services | 2019 |
| Kaur Legal & Immigration Services Limited | Professional & scientific | 2025 |
| Kaur Travels Ltd | Administrative & support | 2024 |
| Kaushalya UK Community Interest Company | Education | 2020 |
| Kawan Enterprise Ltd | Real estate | 2020 |
| Kaws Electrical Ltd | Construction | 2023 |
| KAY Goods Ltd | Wholesale & retail | 2025 |
| Kay's Burger Shack Limited | Hospitality | 2025 |
| Kaya Clinical Ltd | Health & social care | 2025 |
| Kaya Notts Ltd | Transport & logistics | 2019 |
| Kayaan Housing Limited | Households | 2025 |
| Kayjay Hair Supplies Limited | Wholesale & retail | 2011 |
| Kays Solicitors Limited | Professional & scientific | 2023 |
| KAZ Haulage Ltd | Transport & logistics | 2023 |
| KB Clinical Services Ltd | Health & social care | 2026 |
| Kbgc Ltd | Construction | 2026 |
| KBW Solutions Group Ltd | Professional & scientific | 2026 |
| Kbxx Holdings Limited | Financial services | 2025 |
| Kc's Consultants Ltd | Professional & scientific | 2025 |
| Kcfgh Limited | Health & social care | 2023 |
| KCK Retailers Ltd | Wholesale & retail | 2020 |
| KD Fabrications Ltd | Manufacturing | 2020 |
| KD Pipelines Ltd | Construction | 2015 |
| KDM Developments Limited | Construction | 2026 |
| KDM Property Ltd | Construction | 2013 |
| Keac Limited | Professional & scientific | 1996 |
| Keatstech Limited | Wholesale & retail | 2025 |
| Kebab Cannock Ltd | Hospitality | 2023 |
| Kebab Cheslyn HAY Limited | Extraterritorial | 2017 |
| Kebab Republik Ltd | Hospitality | 2025 |
| KEBAB4U Ltd | Wholesale & retail | 2024 |
| Keelex 337 Limited | Real estate | 2009 |
| Keeling Dance Ltd | Arts & recreation | 2019 |
| Keeling School of Dance Ltd | Arts & recreation | 2015 |
| Keep-It-Clean Carpets Limited | Administrative & support | 2024 |
| Keepers Gate Limited | Households | 1993 |
| Keey Homes Ltd | Construction | 2022 |
| Keeyshay Developments Ltd | Real estate | 2024 |
| KEG & Tandoor Limited | Hospitality | 2025 |
| Keith's High Seats Ltd | Manufacturing | 2019 |
| Keizanver Ltd | Administrative & support | 2024 |
| Kekeli and Co Limited | Health & social care | 2023 |
| Kelcher Optometrists Limited | Other services | 1973 |
| Kelly Developments (Stafford) Ltd | Real estate | 2023 |
| Kelly Kelly Ltd | Construction | 2022 |
| Kelly's Coaches Ltd | Transport & logistics | 2023 |
| Kellys Travel and Tours Limited | Administrative & support | 2026 |
| Keltic Limited | Wholesale & retail | 2004 |
| Kelvin Haulahge Limited | Transport & logistics | 2026 |
| Kencar Limited | Manufacturing | 2016 |
| Kenco Plastering Ltd | Construction | 2026 |
| Kendrick Campus Properties Limited | Real estate | 2022 |
| Kenect Plus Ltd | Administrative & support | 2021 |
| Kenect Recruitment (West Midlands) Limited | Administrative & support | 2022 |
| Kenkie Ltd | Wholesale & retail | 2024 |
| Kennan Construction Limited | Construction | 2019 |
| Kensington Serenity Living Limited | Health & social care | 2026 |
| Kent Group Services Limited | Energy | 1994 |
| Kerr Consultancy Services Ltd | Professional & scientific | 2025 |
| Kerry Collins Recruitment Holdings Limited | Financial services | 2021 |
| Kerry Collins Recruitment Limited | Administrative & support | 2003 |
| Kesar Property Group Ltd | Financial services | 2026 |
| Kesh Global Ltd | Wholesale & retail | 2024 |
| Kesh Services Ltd | Wholesale & retail | 2026 |
| Kesmarki Sparkles Limited | Administrative & support | 2025 |
| Kestrel Solar Ltd | Construction | 2026 |
| Kestrel Trading Ltd | Hospitality | 2019 |
| Key Complete Cleaning Services Limited | Administrative & support | 2017 |
| Key Complete Developments Limited | Real estate | 2021 |
| Key Developments 1 Ltd | Construction | 2021 |
| Key Developments 10 Ltd | Construction | 2021 |
| Key Developments 2 Ltd | Construction | 2021 |
| Key Developments 3 Ltd | Construction | 2021 |
| Key Developments 4 Ltd | Construction | 2021 |
| Key Developments 5 Ltd | Construction | 2021 |
| Key Developments 6 Ltd | Construction | 2021 |
| Key Developments 7 Ltd | Construction | 2021 |