| KC1 CIC | Education | 2024 |
| KCA Electronics Ltd | Wholesale & retail | 2025 |
| KCF Estates Limited | Real estate | 2019 |
| KCJ Utilities Ltd | Construction | 2026 |
| Kcmj Consulting Limited | Professional & scientific | 2014 |
| Kcsg Management Limited | Real estate | 2021 |
| KD Consultants Limited | Professional & scientific | 2021 |
| KD Design and Developments Ltd | Construction | 2018 |
| KD Technology Limited | Wholesale & retail | 2017 |
| Kdgservices Ltd | Construction | 2025 |
| KDS Cleaning Limited | Other services | 2025 |
| Keady Associates Limited | Professional & scientific | 2013 |
| Keatts Group Ltd | Construction | 2025 |
| Kebabland SW Ltd | Hospitality | 2025 |
| Keensafe Ltd | Information & communication | 2025 |
| Keepence & Co Accounting Limited | Professional & scientific | 2020 |
| Keiko Nishiyama Limited | Manufacturing | 2014 |
| Kelly MD Limited | Extraterritorial | 2018 |
| Kelly&Sons Holdings Ltd | Financial services | 2024 |
| Kelvin Hughes Limited | Manufacturing | 1971 |
| Kem's Traditional Fish and Chips Ltd | Hospitality | 2016 |
| Kemer Consultancy UK Ltd | Administrative & support | 2026 |
| Kemi Rufai Ltd | Information & communication | 2021 |
| Kemikli Electric Ltd | Manufacturing | 2019 |
| Kemka Limited | Construction | 2015 |
| Kemp's Windows & Doors Ltd | Manufacturing | 2010 |
| Kemzo Ltd | Transport & logistics | 2024 |
| Kenan Kitchen Ltd | Hospitality | 2019 |
| Kendon Flexocare Limited | Extraterritorial | 2005 |
| Kendon Packaging (Midland) Limited | Extraterritorial | 1963 |
| Kendon Packaging Group Public Limited Company | Administrative & support | 1933 |
| Kenmore Interiors Ltd | Wholesale & retail | 2011 |
| Kenny Frederick Education Consultant Limited | Education | 2013 |
| Kensali Ltd | Information & communication | 2020 |
| Kensington Prestige Ltd | Wholesale & retail | 2015 |
| Kent Barbers Limited | Other services | 2015 |
| Kenwood Mansions Limited | Real estate | 1976 |
| Kenza Fragrance Ltd | Extraterritorial | 2021 |
| KEO Industrial Buildings Ltd | Other services | 2013 |
| Kerem & Eren Services Limited | Wholesale & retail | 2024 |
| Kerem CEM Foods Ltd | Wholesale & retail | 2026 |
| Kervan Meat Ltd | Wholesale & retail | 2025 |
| Kerwan Ltd | Real estate | 2022 |
| Keser Meats 68 Ltd | Manufacturing | 2022 |
| Keskidee Media Ltd | Information & communication | 2025 |
| Keth Limited | Wholesale & retail | 2024 |
| Ketham Services Ltd | Health & social care | 2023 |
| KEU Media Ltd | Administrative & support | 2016 |
| Kevden Care Ltd | Health & social care | 2020 |
| Kevi Real Estates Ltd | Real estate | 2025 |
| Kevin & Jack Brothers Ltd | Administrative & support | 2012 |
| Kevin Facilities Management Ltd | Administrative & support | 2026 |
| Keyan Investments Ltd | Real estate | 2023 |
| Keylid Property Limited | Real estate | 2017 |
| Keyslate Limited | Professional & scientific | 2026 |
| Keytor Ltd | Real estate | 2024 |
| Keziah Studios Limited | Information & communication | 2016 |
| Kezlin Group Ltd | Administrative & support | 2026 |
| KFB Garden Ltd | Hospitality | 2025 |
| KFH & Sons Limited | Administrative & support | 2026 |
| KG Auto Repair Ltd | Wholesale & retail | 2018 |
| KGK Studios Ltd | Information & communication | 2022 |
| KH Finance Limited | Professional & scientific | 2007 |
| KH Finance NO.2 Limited | Professional & scientific | 2013 |
| KH Luxury Lingerie Ltd | Wholesale & retail | 2024 |
| Khalid Pervaiz Ltd | Wholesale & retail | 2025 |
| Khalil Foundation | Health & social care | 2023 |
| Khan and Co. Properties Limited | Real estate | 2024 |
| Khane Consulting Limited | Professional & scientific | 2015 |
| Khani Property Group Ltd | Real estate | 2019 |
| Khaybar Limited | Real estate | 2025 |
| Khayden Assets Ltd | Real estate | 2022 |
| Khin Fleets Ltd | Administrative & support | 2026 |
| Khoneh Limited | Real estate | 2019 |
| KIA5 Limited | Health & social care | 2020 |
| Kian Foods Ltd | Hospitality | 2018 |
| Kianajoon Limited | Health & social care | 2007 |
| Kibrisli Ltd | Real estate | 2026 |
| Kickass Online Ltd | Information & communication | 2024 |
| Kicoshep Limited | Health & social care | 2018 |
| Kiddcare Health Ltd | Health & social care | 2020 |
| Kidscape After School Club Ltd | Other services | 2000 |
| Kidsdream Studios Limited | Information & communication | 2026 |
| Kidspace Childminding Limited | Health & social care | 2018 |
| Kidspire Care Homes Limited | Health & social care | 2025 |
| Kidz Village Ltd | Education | 2013 |
| Kiffley UK Limited | Wholesale & retail | 2019 |
| Kiki Youth Education CIC | Education | 2021 |
| Kilgetty Huso Ltd | Hospitality | 2025 |
| Kilic Diagnostics Ltd | Health & social care | 2026 |
| Kilinc Property Ltd | Real estate | 2022 |
| KIM Chippy Limited | Hospitality | 2023 |
| KIM My Phan Limited | Other services | 2026 |
| KIM NAM Limited | Other services | 2017 |
| KIM Rickwood Consulting Ltd | Information & communication | 2024 |
| KIM Supermarket Ltd | Wholesale & retail | 2025 |
| Kimmies Childcare Ltd | Health & social care | 2024 |
| Kindnest Care Limited | Public administration | 2024 |
| Kinetic Joinery Ltd | Manufacturing | 2019 |
| King & Tinker Limited | Hospitality | 2011 |