| Kappin Limited | Professional & scientific | 2001 |
| Kapra Ltd | Wholesale & retail | 2025 |
| Kapriva Ltd | Wholesale & retail | 2012 |
| Kapsch Trafficcom Limited | Transport & logistics | 2006 |
| Kapyani Limited | Manufacturing | 2018 |
| Kara Digital Limited | Professional & scientific | 2023 |
| Kara Equities Ltd | Real estate | 2021 |
| Karachi Grub Ltd | Hospitality | 2024 |
| Karan Enterprises Ltd | Administrative & support | 2020 |
| Karat Properties Ltd | Real estate | 2018 |
| Karatera Limited | Construction | 2016 |
| Karavek Consulting Ltd | Information & communication | 2014 |
| Karbownik Ltd | Transport & logistics | 2018 |
| Kardel Health Limited | Health & social care | 2007 |
| Kardel Holdings Limited | Financial services | 2023 |
| Kardel Investments Limited | Real estate | 2023 |
| Kardo Marketing Limited | Professional & scientific | 2021 |
| Kare Essentials Ltd | Manufacturing | 2026 |
| Kareemi Used Car Parts Limited | Wholesale & retail | 2012 |
| Kareex Ltd | Wholesale & retail | 2026 |
| Karen Coombs Chiropody Limited | Health & social care | 2019 |
| Karen Meaney Consulting Ltd | Information & communication | 2021 |
| Karen Radley Trading Limited | Administrative & support | 2003 |
| Karhold Limited | Hospitality | 2013 |
| Karia Estates Limited | Real estate | 2020 |
| Karia Trading Limited | Wholesale & retail | 2008 |
| Karikala Associates Limited | Professional & scientific | 2009 |
| Karikalan Accountancy Ltd | Professional & scientific | 2012 |
| Karikalan Consultancy Ltd | Other services | 2025 |
| Karikalan Trading Ltd | Wholesale & retail | 2013 |
| Karin Harvest Ltd | Wholesale & retail | 2025 |
| Karish Holdings (Bushey) Ltd | Households | 2025 |
| Karish Holdings Ltd | Households | 2022 |
| Karm Associates Ltd | Information & communication | 2012 |
| Karm HI Tech Limited | Wholesale & retail | 2025 |
| Karma Consultancy Limited | Administrative & support | 2025 |
| Karma DBA Limited | Information & communication | 2006 |
| Karma Foundation | Health & social care | 2019 |
| Karma Import Ltd | Wholesale & retail | 2023 |
| Karmatech Solutions Limited | Professional & scientific | 2009 |
| Karmb Ltd | Professional & scientific | 2021 |
| Karmehar Limited | Real estate | 2006 |
| Karnit Ltd | Education | 2025 |
| Karnophuli Medical Services Limited | Health & social care | 2014 |
| Karol Building Group Ltd | Construction | 2019 |
| Karryworld Limited | Construction | 2021 |
| Kars Consulting Ltd | Professional & scientific | 2019 |
| Kartik Capital Limited | Real estate | 2018 |
| Kartik Investments Ltd | Other services | 2018 |
| Kartik Properties Ltd | Real estate | 2017 |
| Kartikhya Enterprise Ltd | Construction | 2014 |
| Karto Limited | Manufacturing | 2019 |
| Karuna Care (TLC) Limited | Health & social care | 2014 |
| Karuna Properties Ltd | Real estate | 2025 |
| Karuppiah Mathiyalagu Limited | Transport & logistics | 2019 |
| Karwan Electrics Limited | Construction | 2021 |
| KAS Aesthetics Limited | Health & social care | 2021 |
| Kasa Designs Limited | Real estate | 2017 |
| Kasandariya Ltd | Hospitality | 2025 |
| Kase Utopia Ltd | Manufacturing | 2020 |
| Kasha Limited | Professional & scientific | 2009 |
| Kashayaa Ltd | Hospitality | 2025 |
| Kashmir Motors Limited | Wholesale & retail | 2019 |
| Kaslan Ltd | Other services | 2025 |
| Kasman Glass Ltd | Construction | 2024 |
| Kastani Limited | Professional & scientific | 2006 |
| Kastbhanjandev Limited | Hospitality | 2025 |
| Kasthuri Enterprises Ltd | Real estate | 2025 |
| Kastle Chequers Ltd | Real estate | 2026 |
| Kastle Frognal Ltd | Real estate | 2026 |
| Kastle Howberry Ltd | Real estate | 2026 |
| Kastle Ltd | Real estate | 2013 |
| Kastle Octagon Ltd | Real estate | 2026 |
| Kastos Investments LLP | | 2009 |
| Kasturi Ltd | Information & communication | 2020 |
| Katango Ltd | Professional & scientific | 2024 |
| Kate Barker Media Limited | Information & communication | 2016 |
| Kate Labs Ltd | Information & communication | 2025 |
| Katfort Trading Limited | Wholesale & retail | 2019 |
| Kathmandu Design and Build Limited | Construction | 2020 |
| Katis Infotech Ltd | Information & communication | 2014 |
| Katko Investments Limited | Real estate | 2011 |
| Katkuz Muzik Ltd | Information & communication | 2025 |
| Kats (Stockton) Ltd | Administrative & support | 2011 |
| Kaufman and Kaufman Limited | Construction | 2021 |
| Kautherwellness CIC | Health & social care | 2026 |
| Kavarsi Property Ltd | Real estate | 2021 |
| Kavi Shyam Limited | Other services | 2024 |
| Kavya Consultants Ltd | Wholesale & retail | 2023 |
| Kawsar Foundation | Health & social care | 2019 |
| KAY Construction (UK) Ltd | Construction | 2012 |
| KAY DEE Properties Ltd | Real estate | 2020 |
| KAY Properties (London) Limited | Real estate | 2025 |
| Kay's Cookery School Limited | Education | 2007 |
| Kaya Builders Limited | Construction | 2023 |
| Kaya Group Holding Ltd | Financial services | 2026 |
| Kaya Trade Ltd | Financial services | 2026 |
| Kayaco Holdings Limited | Financial services | 2017 |
| Kayaco Properties Limited | Real estate | 2024 |
| Kaybridge Construction (Barnet) Limited | Construction | 1972 |