| Kibo House Ltd | Information & communication | 2017 |
| Kickboxfit Franchise UK Limited | Arts & recreation | 2025 |
| Kickboxfit Limited | Arts & recreation | 2020 |
| Kidd Solutions Limited | Construction | 2019 |
| Kidwell Plumbing and Heating Services Limited | Construction | 2015 |
| Kilfords Ltd | Construction | 2011 |
| Kilimanjaro Your MUM Ltd | Real estate | 2015 |
| Kilmaurs (Holdings) Limited | Real estate | 1960 |
| Kimsam Limited | Information & communication | 2008 |
| KIN & INK Limited | Wholesale & retail | 2020 |
| KIN Insurance Brokers Limited | Financial services | 1995 |
| Kindred Property Services Ltd | Construction | 2021 |
| King Landscaping Limited | Administrative & support | 2019 |
| King Property Holdings Ltd | Real estate | 2025 |
| King's Court Owners Limited | Households | 1990 |
| Kingbrook Limited | Transport & logistics | 1999 |
| Kingfisher Medical Services Limited | Health & social care | 2019 |
| Kingmere Consulting Ltd | Financial services | 2019 |
| Kings Court Management Services Limited | Households | 1992 |
| Kings Fencing Ltd | Construction | 2021 |
| Kings Road Dairy Limited | Wholesale & retail | 2015 |
| Kingsland Freehold Management Ltd | Extraterritorial | 2015 |
| Kingsway Commercial Limited | Professional & scientific | 2009 |
| Kiss ME Kwik Ltd | Wholesale & retail | 2003 |
| Kitkabin Ltd | Wholesale & retail | 2015 |
| Kitparadise Ltd | Wholesale & retail | 2024 |
| Kitshop Workwear Limited | Wholesale & retail | 2019 |
| Kiwi CRU Limited | Wholesale & retail | 2024 |
| Kiwi L. Homes Ltd | Real estate | 2023 |
| Kj's Building Contractors Ltd | Construction | 2015 |
| KKF Wine Ltd | Wholesale & retail | 2022 |
| Klassenmann Property Limited | Real estate | 2025 |
| Klean Group Ltd | Administrative & support | 2018 |
| Klearview Developments Limited | Real estate | 2020 |
| Kleen 2 Ltd | Administrative & support | 2025 |
| Kleen Holdings Limited | Financial services | 2019 |
| Kleen Limited | Administrative & support | 2000 |
| Kleen Properties Limited | Real estate | 2016 |
| Kleen Property Ltd | Financial services | 2023 |
| Kleenzone Limited | Administrative & support | 2015 |
| Klikett Limited | Extraterritorial | 2024 |
| Kline Earner Limited | Real estate | 1990 |
| KLM Consulting Ltd | Professional & scientific | 2026 |
| KLM Property Developments Ltd | Construction | 2018 |
| Klong Music Services Ltd | Information & communication | 2025 |
| Klpic Ltd | Real estate | 2025 |
| KM Gloucester Court Ltd | Real estate | 2023 |
| Kmba Properties Limited | Households | 2023 |
| KMF Events Ltd | Administrative & support | 2017 |
| KMX Care Ltd | Health & social care | 2015 |
| Knight & Associates Ltd | Professional & scientific | 2012 |
| Knight Properties Limited | Real estate | 1988 |
| Knight's Windows and Doors Ltd | Construction | 2016 |
| Knights Court (Haywards Heath) Limited | Real estate | 2011 |
| Knights Hardware Limited | Wholesale & retail | 2019 |
| Kniteforce Distribution Limited | Wholesale & retail | 2023 |
| Kniteforce Limited | Wholesale & retail | 2021 |
| Kniteforce Publishing Limited | Information & communication | 2024 |
| Knott END PUB Company Limited | Hospitality | 2012 |
| Know My Building Ltd | Information & communication | 2024 |
| Knutzon Ltd | Wholesale & retail | 2020 |
| KNW Studios Limited | Arts & recreation | 2020 |
| Ko-Arla Crafts Limited | Arts & recreation | 2018 |
| Koala Bears Ltd | Real estate | 2021 |
| Koazy Corner Limited | Information & communication | 2024 |
| Kobicomm Limited | Information & communication | 2022 |
| Kobudera Pictures Limited | Information & communication | 2026 |
| Kodama BJJ Ltd | Arts & recreation | 2026 |
| Kojis Revenge Ltd | Information & communication | 2021 |
| Kolbeh Restaurant Limited | Hospitality | 2019 |
| Kolkata Cuisine Ltd | Hospitality | 2025 |
| Konsultancy Pro Ltd. | Information & communication | 2009 |
| Konuk Event Ltd | Hospitality | 2021 |
| Konuk Property Ltd | Real estate | 2024 |
| Kopane Diamond Developments Limited | Professional & scientific | 2000 |
| Korays Media Ltd | Information & communication | 2021 |
| Koromo Properties Limited | Real estate | 2018 |
| Kovacs Recruitment Ltd | Administrative & support | 2010 |
| KP SON Ltd | Wholesale & retail | 2015 |
| KPV Installations Limited | Construction | 2022 |
| Krash Property Ltd | Real estate | 2023 |
| Kribik Ltd | Information & communication | 2024 |
| Krnajski Properties LLP | | 2019 |
| Krona Design Ltd | Professional & scientific | 2015 |
| Kronman Associates Limited | Information & communication | 2010 |
| Krushna Healthcare Limited | Health & social care | 2025 |
| KSB Services Limited | Professional & scientific | 2015 |
| Ksiolajidebt Ltd | Arts & recreation | 2012 |
| KSK Food & Wine Sussex Ltd | Wholesale & retail | 2020 |
| KSS Primary Care Holdings Ltd | Health & social care | 2020 |
| KSW Consultants Ltd | Professional & scientific | 2023 |
| KT Building Limited | Water & waste | 2019 |
| KT Design Studio Limited | Extraterritorial | 2021 |
| Ktlx Ltd | Real estate | 2022 |
| KTS Estate Management Limited | Real estate | 2010 |
| KTY Landscape Contractor Limited | Administrative & support | 2014 |
| Kuala Holdings Limited | Financial services | 2026 |
| Kuala Ltd | Information & communication | 2022 |
| Kudu Professional Services Ltd | Professional & scientific | 2023 |
| Kudu Projects Ltd. | Professional & scientific | 2009 |