| Kani Express Ltd | Wholesale & retail | 2025 |
| Kanish Health Ltd. | Wholesale & retail | 2017 |
| Karakocan 23 Limited | Hospitality | 2026 |
| Karbur-L Limited | Professional & scientific | 2010 |
| Kashcom Limited | Professional & scientific | 2007 |
| Kassa Property Services Ltd | Administrative & support | 2022 |
| Katch Group Ltd | Wholesale & retail | 2019 |
| Kate Malone Interiors Limited | Professional & scientific | 2023 |
| Kate Trans Ltd | Transport & logistics | 2025 |
| Kate's K9S Ltd | Agriculture & fishing | 2026 |
| Kayla Gabriela Ltd | Transport & logistics | 2023 |
| KB Tech Solutions Ltd | Information & communication | 2012 |
| KCG Holdings Ltd | Real estate | 2016 |
| KCG Partnership Limited | Professional & scientific | 2015 |
| KDN Limited | Hospitality | 2013 |
| Keane Group Limited | Financial services | 2000 |
| Keelings Limited | Professional & scientific | 2015 |
| Keith Core Fitness Ltd | Arts & recreation | 2021 |
| Kejison Limited | Health & social care | 2016 |
| Kellhol Bricklayers Limited Limited | Construction | 2023 |
| Kennett Lindsell Designs Ltd | Manufacturing | 2023 |
| Kestrel IDM Limited | Information & communication | 2003 |
| Kestronics Holdings Limited | Professional & scientific | 2016 |
| Kestronics Limited | Wholesale & retail | 1989 |
| Kestronics.Com Limited | Wholesale & retail | 1983 |
| Kevin Armando Ltd | Hospitality | 2022 |
| Keycradle Ltd | Wholesale & retail | 2023 |
| Khaleej Security Ltd | Administrative & support | 2020 |
| Khattak Group Limited | Wholesale & retail | 2025 |
| Khya Developments Limited | Real estate | 2017 |
| Kiana Group Ltd | Financial services | 2020 |
| Kibuuka Multi Services Ltd | Health & social care | 2019 |
| Kidsnewshoes.Com Ltd | Wholesale & retail | 2004 |
| Kimpton Properties Limited | Real estate | 2017 |
| KIN Essence Ltd | Health & social care | 2025 |
| Kinaria Ltd | Information & communication | 2023 |
| Kincore Group Ltd | Transport & logistics | 2026 |
| Kindred Clearview Limited | Administrative & support | 2026 |
| King & Co (Allum Lane West) Ltd | Construction | 2017 |
| King & Co (Hertford Road) Ltd | Construction | 2019 |
| King & Co (Little Swan) Ltd | Real estate | 2018 |
| King & Co (Manor Road) Ltd | Construction | 2017 |
| King & Co (Mountway) Ltd | Construction | 2017 |
| King & Co (NYN Manor) Ltd | Construction | 2019 |
| King & Co (Sheriff) Ltd | Construction | 2019 |
| King & Co (South Mimms) Ltd | Construction | 2018 |
| King & Co (the Vines) Ltd | Construction | 2019 |
| King & Co (Wells) Ltd | Construction | 2019 |
| King & Co (Woolmer/Rabley) Ltd | Construction | 2019 |
| King & Co Investments Limited | Construction | 2017 |
| King & Co Platform 1 Ltd | Construction | 2018 |
| King & Co Platform 2 Ltd | Construction | 2019 |
| King & Co Properties (Blanche Lane) Ltd | Construction | 2019 |
| King & Co Properties (Dane END) Ltd | Construction | 2017 |
| King & Co Properties (Little Heath) Ltd | Construction | 2016 |
| King & Co Properties (Tonwell) Ltd | Construction | 2018 |
| King & Co Properties (Welwyn) Ltd | Construction | 2016 |
| King & Co Properties Ltd | Construction | 2015 |
| King Properties Company Limited | Real estate | 1987 |
| Kingair Limited | Extraterritorial | 1994 |
| Kingdom Flooring Ltd | Construction | 2022 |
| Kingdom Light Centre Limited | Other services | 2006 |
| Kingman Services (Hire) Limited | Transport & logistics | 2006 |
| Kings Estate Agents Limited | Professional & scientific | 2005 |
| Kingswood Consultancy Ltd | Information & communication | 2015 |
| Kingswood Golf and Leisure Park Limited | Arts & recreation | 2001 |
| Kinjal Investment Ltd | Real estate | 2020 |
| Kinnersley Investments Limited | Financial services | 2022 |
| Kinto Tyres UK Ltd | Wholesale & retail | 2025 |
| Kirsop Holdings Limited | Financial services | 2018 |
| Kirsty's Craft Limited | Hospitality | 2022 |
| Kisu Limited | Administrative & support | 2019 |
| Kisz Trans Ltd | Transport & logistics | 2024 |
| KIT Online Limited | Extraterritorial | 1989 |
| Kitkat Autos Limited | Wholesale & retail | 2014 |
| KKP Consultancy Limited | Information & communication | 2026 |
| Klean 2 Perfection Ltd. | Administrative & support | 2018 |
| KMK Kamil Ltd | Transport & logistics | 2018 |
| KN Traders Limited | Wholesale & retail | 2018 |
| Knuway Investments Limited | Real estate | 1973 |
| Koaila Ltd | Information & communication | 2025 |
| Kohvaa Ltd | Wholesale & retail | 2026 |
| Komad Ltd | Health & social care | 2013 |
| Konsult Management Services Limited | Professional & scientific | 2020 |
| Kottoor Building Solutions Ltd | Construction | 2018 |
| Kottoor Buildings Ltd | Manufacturing | 2024 |
| Koubeh Limited | Other services | 2021 |
| KP Dental Practice Limited | Health & social care | 2011 |
| KPT Services Ltd | Hospitality | 2023 |
| KQ Chess Ltd | Arts & recreation | 2025 |
| Krasscat 26 Limited | Transport & logistics | 2026 |
| Kraven Consulting Ltd | Construction | 2012 |
| Krein Construction Services Limited | Construction | 2019 |
| Krylyn Ltd | Other services | 2016 |
| Krypton Building Services Ltd | Construction | 2018 |
| KTW Cosmetics Limited | Wholesale & retail | 2017 |
| Kubed Solutions Limited | Information & communication | 2019 |
| Kuei Ltd | Information & communication | 2025 |
| Kuwahara Software Ltd | Wholesale & retail | 2022 |
| Kuzy Ltd | Arts & recreation | 2025 |