| Khiari OUD Ltd | Wholesale & retail | 2025 |
| Khione (Refrigeration Systems) Limited | Manufacturing | 2020 |
| Khizar Investments Ltd | Real estate | 2023 |
| Khleeman Capital Ltd | Real estate | 2019 |
| Khodium Ltd | Health & social care | 2021 |
| Khol by Roohi Limited | Other services | 2017 |
| Khoni Investments LLP | | 2015 |
| Khordad Limited | Wholesale & retail | 2024 |
| Khosla Wealth Management Limited | Education | 2011 |
| KHT Property Limited | Real estate | 2021 |
| Khuram Optical Limited | Health & social care | 2011 |
| Khurb Ltd | Construction | 2022 |
| Khushe Limited | Hospitality | 2022 |
| KI Howell Ltd | Health & social care | 2022 |
| KI Infinity Ltd | Wholesale & retail | 2019 |
| KIA3 Ltd | Hospitality | 2023 |
| Kiaan Foods Ltd | Wholesale & retail | 2024 |
| Kiara Jewellers Ltd | Wholesale & retail | 2022 |
| Kiaraa Limited | Hospitality | 2022 |
| Kiav Ltd | Wholesale & retail | 2023 |
| Kibatek Ltd | Information & communication | 2014 |
| Kichady General Ltd | Transport & logistics | 2026 |
| Kick the Stigma Ltd | Wholesale & retail | 2025 |
| Kickboxuk Clifton Ltd | Arts & recreation | 2022 |
| Kickboxuk Ltd | Arts & recreation | 2017 |
| Kickfit Limited | Education | 2003 |
| Kickstart Engineering Ltd | Wholesale & retail | 2026 |
| Kidd Hospitality Ltd | Hospitality | 2022 |
| Kiddies First Limited | Professional & scientific | 2013 |
| Kidney Nutrition Advice LLP | | 2023 |
| Kids First Events Limited | Hospitality | 2023 |
| Kids Inheritance Ltd | Real estate | 2025 |
| Kidstoysnts Ltd | Wholesale & retail | 2026 |
| Kidzmilk Ltd | Transport & logistics | 2013 |
| Kie-Time Logistics Limited | Administrative & support | 2017 |
| Kiese Ltd | Administrative & support | 2021 |
| Kigali Coffee Ltd | Hospitality | 2019 |
| Kightley Group Holdings Limited | Extraterritorial | 2024 |
| KIK Consultancy Ltd | Professional & scientific | 2025 |
| Kiki Lovelle Ltd | Wholesale & retail | 2013 |
| Kilard Limited | Manufacturing | 1967 |
| Kilbane Construction Limited | Construction | 2015 |
| Kildare Estates Limited | Real estate | 2022 |
| Kilinik Ltd | Real estate | 2024 |
| Kilise Ltd | Hospitality | 2019 |
| Killarney Farms Limited | Construction | 2016 |
| Killarney Homes Developments Limited | Construction | 2017 |
| Killarney Homes Limited | Administrative & support | 2010 |
| Killarney Homes Sales Limited | Real estate | 2014 |
| Killer Stack Labs Limited | Wholesale & retail | 2017 |
| Killick Telecom Ltd | Information & communication | 2021 |
| Killicks Limited | Professional & scientific | 2002 |
| Killicks Marketing Limited | Extraterritorial | 2022 |
| Killigrew Limited | Hospitality | 2003 |
| Killimore Financial Management Ltd | Financial services | 2013 |
| Killimore Will & Legal Services Ltd | Professional & scientific | 2022 |
| Kilmac Blue Limited | Construction | 2011 |
| Kilnwood Limited | Professional & scientific | 1997 |
| Kilovoyage Ltd | Wholesale & retail | 2025 |
| Kilwarlin Productions Ltd | Arts & recreation | 2023 |
| KIM Estates Ltd | Real estate | 2024 |
| KIM Turner Consulting Ltd | Information & communication | 2023 |
| KIM Watts Consultancy Ltd | Health & social care | 2020 |
| Kimamzn Ltd | Extraterritorial | 2024 |
| Kimberley Caravan Centre Limited | Wholesale & retail | 1983 |
| Kimberley Farms (Harby) Ltd | Agriculture & fishing | 2004 |
| Kimberley Fireplaces Limited | Wholesale & retail | 2019 |
| Kimberley Funeral Service Limited | Other services | 2014 |
| Kimberley Miners Welfare FC Limited | Arts & recreation | 2026 |
| Kimberley Power Ltd | Professional & scientific | 2014 |
| Kimberley Projects Ltd | Construction | 2020 |
| Kimberley Store Ltd | Wholesale & retail | 2022 |
| Kimia Consultancy Ltd | Health & social care | 2022 |
| KIN Haus Limited | Real estate | 2026 |
| KIN Lifetime Planning Limited | Financial services | 2021 |
| KIN Property Improvements Ltd | Manufacturing | 2024 |
| Kincare Agency Limited | Health & social care | 2024 |
| Kincraig Holdings Limited | Professional & scientific | 2019 |
| Kind Hands Home Support Limited | Health & social care | 2026 |
| Kind Healthcare Ltd | Public administration | 2021 |
| Kinder Events Limited | Hospitality | 2023 |
| Kinder Scout Solutions Ltd | Professional & scientific | 2025 |
| Kinderhr Limited | Administrative & support | 2025 |
| Kindly Light Ltd. | Wholesale & retail | 2025 |
| Kindness Limited | Professional & scientific | 2007 |
| Kindred Well Healthcare Limited | Public administration | 2025 |
| Kindtopet Ltd | Professional & scientific | 2024 |
| Kinetic IB Limited | Arts & recreation | 2026 |
| Kinetic Studio Ltd | Arts & recreation | 2018 |
| Kineton Manor Limited | Health & social care | 1977 |
| King of Hearts Limited | Wholesale & retail | 2020 |
| King of the Gym Ltd | Wholesale & retail | 2026 |
| King Print & SEW Limited | Wholesale & retail | 2026 |
| King Rock Developments Ltd | Construction | 2020 |
| King Rock Investments Ltd | Administrative & support | 2017 |
| King Rock Ltd | Construction | 2015 |
| King Street Business Centre Ltd | Real estate | 2003 |
| King Trucks Ltd | Wholesale & retail | 2020 |
| Kingdom Architectural Glazing Systems Ltd | Construction | 2016 |
| Kingdom Bank Limited | Financial services | 2002 |