| Key Sigma Ltd | Professional & scientific | 2021 |
| KEY2PASS Ltd | Education | 2026 |
| Keyflow (UK) Ltd | Administrative & support | 2012 |
| Keyflow Holding Group Ltd | Financial services | 2025 |
| Keyflow Holdings Ltd | Financial services | 2025 |
| Keylock Holdings Ltd | Financial services | 2026 |
| Keynsham Consulting Limited | Professional & scientific | 2020 |
| Keynshambury House Management Company Limited | Households | 1993 |
| Keyquarter Ltd | Real estate | 2016 |
| Keystone Centre for Innovation and Learning Ltd | Education | 2023 |
| KFO Empire Limited | Wholesale & retail | 2020 |
| KFT Foods Ltd | Hospitality | 2023 |
| Khalida Consulting Ltd | Information & communication | 2009 |
| Khawar Property Investment Ltd | Real estate | 2021 |
| Khkl Ltd | Hospitality | 2024 |
| Khudos Ltd | Professional & scientific | 2017 |
| Kibentley Ltd | Professional & scientific | 2025 |
| Kibou Restaurants Limited | Hospitality | 2019 |
| KIC Group Limited | Wholesale & retail | 2020 |
| Kickeroos Ltd | Education | 2024 |
| Kidnappers Cider Company Ltd | Manufacturing | 2020 |
| Kidsonestopshop Limited | Wholesale & retail | 2009 |
| Kidz Matter Ltd | Education | 2011 |
| Kiln Fields Renewable Energy Limited | Construction | 2021 |
| Kilroy James Limited | Wholesale & retail | 2002 |
| Kilrush Property Limited | Real estate | 2017 |
| Kilvington Classic Ltd | Wholesale & retail | 2023 |
| Kimble Limited | Wholesale & retail | 2008 |
| Kind Commercial Limited | Administrative & support | 2014 |
| Kind Consultancy Limited | Administrative & support | 2012 |
| Kind Financial Services Ltd | Financial services | 2011 |
| Kinetic Design Ltd | Professional & scientific | 2007 |
| Kinetic Growth Limited | Professional & scientific | 2023 |
| Kineton Media Services Limited | Professional & scientific | 2023 |
| King Close Management Ltd | Households | 2019 |
| King Companies Ltd | Professional & scientific | 2025 |
| King Equine Transport Limited | Transport & logistics | 2022 |
| King George's Field Shurdington Limited | Arts & recreation | 2012 |
| King Stone Dairy Ltd | Manufacturing | 2018 |
| King's Daughters Ltd | Other services | 2013 |
| Kingdom Trainers Ltd | Arts & recreation | 2025 |
| Kingfisher Flooring Limited | Construction | 2010 |
| Kings Hollow Management Limited | Households | 2015 |
| Kings Horticulture Limited | Agriculture & fishing | 1987 |
| Kings House Realty Ltd. | Real estate | 2004 |
| Kingscote Park Limited | Financial services | 2024 |
| Kingscott DIX (Cheltenham) Limited | Professional & scientific | 2009 |
| Kingsdell Properties Limited | Real estate | 1998 |
| Kingsley & Co (Properties) Limited | Real estate | 2022 |
| Kingsley Evans Limited | Real estate | 2013 |
| Kingsley Smythe Limited | Wholesale & retail | 2009 |
| Kingsley Smythe Trading Ltd | Wholesale & retail | 2022 |
| Kingston RTM Company Limited | Households | 2024 |
| Kingswood (South West) Limited | Health & social care | 2021 |
| Kinshi Lodelaw Limited | Professional & scientific | 2018 |
| Kinship Social Ltd | Professional & scientific | 2023 |
| Kinshofer UK Limited | Wholesale & retail | 1983 |
| Kinsip Ltd | Manufacturing | 2025 |
| Kinsman Construction Cheltenham Limited | Construction | 2013 |
| Kinteh Cashews Ltd | Manufacturing | 2026 |
| Kipling Batten Limited | Real estate | 2018 |
| Kirby Nominees Limited | Professional & scientific | 2013 |
| Kirisham Ltd | Wholesale & retail | 2017 |
| Kirkby Green NG Limited | Financial services | 2022 |
| Kirkgate Dental Surgery (Newark) Limited | Health & social care | 2018 |
| Kirkham Pryer Limited | Professional & scientific | 2008 |
| Kirkhampennell Ltd | Real estate | 2024 |
| Kirsty Robinson Limited | Financial services | 2022 |
| Kisstie Limited | Extraterritorial | 1997 |
| Kitchen Kraze Ltd | Wholesale & retail | 2024 |
| Kivin Express Ltd | Wholesale & retail | 2019 |
| Kivin Properties Ltd | Real estate | 2022 |
| Kiwa Holdings (UK) Limited | Professional & scientific | 2010 |
| Kiwa Limited | Professional & scientific | 1997 |
| Kiwa Quality Services Ltd | Extraterritorial | 2001 |
| Kizuna Solutions Limited | Administrative & support | 2018 |
| KJ Accountants Ltd | Professional & scientific | 2023 |
| KJE Engineering Ltd | Manufacturing | 2013 |
| KJE Properties Limited | Manufacturing | 1973 |
| Kjeldsen Limited | Construction | 2021 |
| KJG Property Management Limited | Administrative & support | 2017 |
| KJH Associates Limited | Professional & scientific | 2023 |
| KJS Consulting Engineers Ltd | Professional & scientific | 2025 |
| KJW Accountancy Services (Cotswolds) Ltd | Professional & scientific | 2022 |
| KK New Barn Ltd | Wholesale & retail | 2020 |
| KL Manor Ltd | Health & social care | 2016 |
| Klassic Care Place Limited | Transport & logistics | 2024 |
| Klassic Global Service Limited | Construction | 2023 |
| Klosters Consulting Limited | Health & social care | 2022 |
| Klpg Ltd | Real estate | 2025 |
| KLR Developments Ltd | Real estate | 2025 |
| KM Kaiy Ltd | Arts & recreation | 2021 |
| KM Telecom Ltd | Information & communication | 2015 |
| KMC Motors Limited | Wholesale & retail | 2025 |
| KMG Shropshire Ltd | Professional & scientific | 2019 |
| Knapp Homes Ltd | Real estate | 2022 |
| Knapp Productions Ltd | Arts & recreation | 2024 |
| Knight Endodontics Limited | Health & social care | 2020 |
| Knight Provisions Limited | Wholesale & retail | 1988 |
| Knights Fine Produce Limited | Wholesale & retail | 2022 |