| Kiely Brothers Carriageways (UK) Limited | Construction | 2025 |
| Kiera Stores UK Ltd | Wholesale & retail | 2025 |
| Kieran Holdings Limited | Financial services | 2020 |
| Kieran Properties Limited | Real estate | 2006 |
| Kieranmander.Com Limited | Administrative & support | 2018 |
| KIF 24 Health Care Limited | Health & social care | 2016 |
| Kifayah Limited | Wholesale & retail | 2025 |
| Kifli Group Ltd | Financial services | 2022 |
| Kifli Properties Ltd | Real estate | 2022 |
| Kiik Transport Limited | Transport & logistics | 2020 |
| Kiiro Limited | Information & communication | 2013 |
| Kiitools Ltd | Wholesale & retail | 2023 |
| Kijo Creative Ltd | Information & communication | 2014 |
| Kikacare Ltd | Wholesale & retail | 2025 |
| Kikadecor Limited | Hospitality | 2026 |
| Kikis Fish Bar Ltd | Hospitality | 2025 |
| Kikis Home Limited | Real estate | 2023 |
| Kikit Pathways to Recovery CIC | Health & social care | 2013 |
| Kiklab Ltd | Information & communication | 2015 |
| Kiko Store Ltd | Wholesale & retail | 2021 |
| Kikos Bright House Ltd | Construction | 2025 |
| Kilale Ltd | Wholesale & retail | 2022 |
| Kilcos Cargo Services Ltd | Transport & logistics | 2023 |
| Kilcoyne Associates Limited | Education | 2008 |
| Kilduff Carpentry Contractors Limited | Construction | 2004 |
| Kilkerrin Construction Limited | Professional & scientific | 2023 |
| Killea Inns Limited | Hospitality | 2025 |
| Killick Property Limited | Real estate | 2016 |
| Kilm Ltd | Construction | 2018 |
| Kilmurry Ltd | Construction | 2020 |
| Kilmwood Limited | Hospitality | 2019 |
| Kiln Farm VI Management Company Limited | Real estate | 1988 |
| Kiltered Consulting Ltd | Professional & scientific | 2020 |
| KIM Duong Hair Ltd | Other services | 2022 |
| KIM KIM Property Limited | Real estate | 2021 |
| KIM Spencer Commissioning Systems Limited | Construction | 2003 |
| Kim's Kitchen 18 Ltd | Hospitality | 2020 |
| Kimaty Diamonds Ltd | Wholesale & retail | 2026 |
| Kimbellino's Coffee Shop Limited | Other services | 2012 |
| Kimberley Dean Ltd | Professional & scientific | 2008 |
| Kimberley Family Care Limited | Health & social care | 2007 |
| Kimberley Soccer Development Ltd | Arts & recreation | 2020 |
| Kimberlite Ltd | Real estate | 2010 |
| Kimberlite Retail Ltd | Other services | 2013 |
| Kimbley IT Limited | Information & communication | 2011 |
| Kimchi Cardiff Limited | Hospitality | 2017 |
| Kimchi Power Limited | Wholesale & retail | 2022 |
| Kimchie Ltd | Hospitality | 2015 |
| Kimesca Ltd | Wholesale & retail | 2023 |
| Kimichi School | Education | 2012 |
| Kimkookes Limited | Hospitality | 2025 |
| Kimm Properties Ltd | Real estate | 2017 |
| Kimmit Ltd | Information & communication | 2021 |
| Kimmiu Ltd | Wholesale & retail | 2025 |
| Kimone Consultancy Ltd | Professional & scientific | 2026 |
| Kim’S Kitchen Caribbean Restaurant Take Away and Catering Ltd | Hospitality | 2025 |
| KIN Equity Insights Limited | Real estate | 2023 |
| KIN Home Ltd | Wholesale & retail | 2017 |
| KIN Trading Ltd | Real estate | 2025 |
| Kinara Properties Ltd | Real estate | 2025 |
| Kinara Property Management Ltd | Real estate | 2023 |
| Kincaid Envelope Facades Ltd | Construction | 2010 |
| Kincare Connect Ltd | Health & social care | 2026 |
| Kind Aesthetics Ltd | Health & social care | 2021 |
| Kind for Humanitarian Relief and Development Ltd | Education | 2024 |
| Kind Hands Limited | Health & social care | 2021 |
| Kinder Design Laboratories Limited | Extraterritorial | 2022 |
| Kinder Design Solutions Ltd | Extraterritorial | 2022 |
| Kinder Design Studios Limited | Extraterritorial | 2022 |
| Kinder Planet Company Ltd | Wholesale & retail | 2022 |
| Kindest Hands Ltd | Health & social care | 2020 |
| Kindora Staffing & Support Ltd | Administrative & support | 2026 |
| Kindred Care Services Ltd | Health & social care | 2026 |
| Kindy’S Kitchen Ltd | Hospitality | 2024 |
| Kinekode Limited | Administrative & support | 2019 |
| Kinetic Kare Ltd | Health & social care | 2025 |
| Kinetic Money Limited | Financial services | 2015 |
| Kinetic Real Estate Ltd | Real estate | 2025 |
| Kinetikal Ltd | Wholesale & retail | 2024 |
| Kineton (Warwick) Limited | Agriculture & fishing | 2026 |
| Kineton Grange (Olton) Management Company Limited | Households | 2006 |
| Kineton Homes Limited | Real estate | 2018 |
| King & Mehta Limited | Professional & scientific | 2025 |
| King Arthur Inns Limited | Hospitality | 2014 |
| King City Online Ltd | Information & communication | 2021 |
| King Edward VI Academy Trust Birmingham | Education | 2017 |
| King Edward VI Sheldon Heath Charitable Fund | Education | 2009 |
| King Galante Homes Ltd | Real estate | 2021 |
| King Jesus Pentecostal Fellowship Ltd | Information & communication | 2016 |
| King Kebab Limited | Extraterritorial | 2008 |
| King Khan Investments Limited | Financial services | 2025 |
| King KOI Ltd | Wholesale & retail | 2025 |
| King River Properties Limited | Real estate | 2019 |
| King TUT Excursions Limited | Administrative & support | 2025 |
| Kingate Press (Birmingham) Limited | Manufacturing | 1983 |
| Kingbear Industries Limited | Financial services | 2022 |
| Kingcraig Holdings Ltd | Professional & scientific | 2016 |
| Kingdom Asset Management Ltd | Other services | 2017 |
| Kingdom Beds Ltd | Manufacturing | 2020 |
| Kingdom Best Ltd | Wholesale & retail | 2026 |