| Kast Concrete Basins Ltd | Manufacturing | 2011 |
| Kastro Group Ltd | Financial services | 2025 |
| Kastro Ltd | Professional & scientific | 2019 |
| Katehole Trading Company Limited | | 1987 |
| Kawkub Ltd | Professional & scientific | 2024 |
| KAY Shilton Coaching Ltd | Professional & scientific | 2022 |
| Kaya International Ltd | Wholesale & retail | 2019 |
| Kaya Paint Ltd | Construction | 2021 |
| Kayah Property Limited | Real estate | 2025 |
| Kaygm Limited | Other services | 2026 |
| Kayiboyu Ltd | Hospitality | 2022 |
| KB Nexus Ltd | Wholesale & retail | 2026 |
| KBS23 Ltd | Arts & recreation | 2023 |
| KBW Property Limited | Real estate | 2006 |
| KC Painting & Decorating Ltd | Construction | 2024 |
| KC Prestige Properties Ltd | Households | 2025 |
| KC Systems Safety Limited | Professional & scientific | 2026 |
| KCD Builders Ltd | Construction | 2026 |
| Kdelgado Ltd | Other services | 2023 |
| KDH Electrical Services Ltd | Construction | 2019 |
| KDN Transport Ltd | Transport & logistics | 2016 |
| KDT Trading Ltd | Other services | 2013 |
| KE Bathrooms Ltd | Construction | 2015 |
| Keats Roofing Ltd | Construction | 2026 |
| Kebab Royalle Limited | Hospitality | 2024 |
| Keemson Services Ltd. | Information & communication | 2014 |
| Keene Holdings Limited | Financial services | 2023 |
| Keep Droning on Limited | Hospitality | 2025 |
| Keeps Getting Better Limited | Wholesale & retail | 2013 |
| Keith Rhodes Holdings Limited | Real estate | 2020 |
| Keith Rhodes Machinery Installations Limited | Manufacturing | 2002 |
| Kellaway Automotive Solutions Ltd | Wholesale & retail | 2025 |
| Kelly Terranova Limited | Information & communication | 2014 |
| Kelly-Welby Associates Limited | Professional & scientific | 2004 |
| Keloscape Fire Consult Ltd | Public administration | 2018 |
| Kemble Property Ltd | Real estate | 2025 |
| Kempster's Reach Management Company Limited | Extraterritorial | 2024 |
| KEN Buchanan Driver Training Limited | Education | 2014 |
| KEN Dowling Property Ltd | Real estate | 2025 |
| Kendall Lane (Phase II) Management Company Limited | Extraterritorial | 2024 |
| Kendra Leather Ltd | Manufacturing | 2022 |
| Kenelm Joinery Limited | Manufacturing | 2008 |
| Kenilworth House (Cheltenham) Management Limited | Real estate | 2009 |
| Kenlare Limited | Other services | 1982 |
| Kenmege Health and Associates Ltd | Health & social care | 2023 |
| Kent & Sons Limited | Wholesale & retail | 2024 |
| Kentfast Limited | Construction | 2022 |
| Kentucky Air Limited | Real estate | 1999 |
| Kerala House Ltd | Real estate | 2024 |
| Kerryannes 'S Kitchen Ltd | Hospitality | 2025 |
| Kesselmann Heating and Plumbing Ltd | Construction | 2026 |
| Kestec Digital Solutions Ltd | Information & communication | 2013 |
| Ketchup Media Limited | Information & communication | 2024 |
| Keve Properties Limited | Real estate | 2009 |
| Kevin Harris Civils and Rail Project Management Limited | Construction | 2021 |
| Key 2 Financial Solutions Limited | Financial services | 2006 |
| Key 2 Wills Ltd | Other services | 2013 |
| Key Growth Ltd | Financial services | 2020 |
| Key Time Gloucester Ltd | Extraterritorial | 1981 |
| Key Urban Living Ltd | Real estate | 2025 |
| Keynes Investments Limited | Real estate | 2024 |
| Keynsham Storage Ltd | Transport & logistics | 2022 |
| Keystone Keys Properties Ltd | Construction | 2024 |
| Keystone Risk Management Limited | Professional & scientific | 2007 |
| Keystone Spire Commercial Finance Ltd | Professional & scientific | 2026 |
| Keyway (Gloucester) Limited | Extraterritorial | 2015 |
| Keyway Construction Limited | Construction | 2020 |
| Keyway Group Limited | Extraterritorial | 2015 |
| Keyway Holdings Limited | Extraterritorial | 2015 |
| Keyway Limited | Administrative & support | 1995 |
| Keyway Plant & Transport Ltd | Transport & logistics | 2024 |
| Keyway Recycling Limited | Extraterritorial | 2008 |
| Keyway Stone Supplies Limited | Extraterritorial | 2014 |
| KF Direct Ltd | Wholesale & retail | 2019 |
| KFO Wings Ltd | Hospitality | 2026 |
| Kftseekers Ltd | Wholesale & retail | 2016 |
| KG Electrical (SW) Ltd | Construction | 2025 |
| KG Hosting Solutions Ltd | Real estate | 2026 |
| Khaf Group Limited | Wholesale & retail | 2026 |
| Khan Global Transfer Solutins Ltd | Transport & logistics | 2026 |
| Khan Kebab GL Ltd | Hospitality | 2019 |
| Khanna Dental Limited | Health & social care | 2014 |
| Khaya Coffee Ltd | Hospitality | 2025 |
| Khuub UK Limited | Transport & logistics | 2021 |
| KIB Consulting Ltd | Professional & scientific | 2024 |
| Kick Back and Travel Ltd | Administrative & support | 2018 |
| Kicx Ltd | Other services | 2025 |
| Kidz R UZ Limited | Administrative & support | 2007 |
| Kierowcy HGV UK Ltd | Wholesale & retail | 2015 |
| Kiffah Ltd | Hospitality | 2025 |
| Kikis Care Ltd | Health & social care | 2025 |
| Kilbury Conservation Ltd | Construction | 2017 |
| Kilbury Construction Limited | Construction | 2000 |
| Kilbury Developments Limited | Construction | 2012 |
| Kilvermin Pest Control Limited | Health & social care | 2014 |
| KIM Legal Limited | Professional & scientific | 2023 |
| Kimsbury Land Management Limited | Administrative & support | 2025 |
| Kinahan Services Limited | Manufacturing | 2020 |
| Kinetiq Solutions Limited | Real estate | 2011 |
| King Builders (Gloucester) Limited | Construction | 1980 |