| K3 BTG Limited | Information & communication | 2007 |
| K3 Business Technology Group Limited | Professional & scientific | 1991 |
| K3 Business Technology Group Trustees Company Limited | Professional & scientific | 2001 |
| K3 Fashion Limited | Information & communication | 2025 |
| K3 Property Holdco Limited | Real estate | 2024 |
| K3 Software UK Limited | Information & communication | 1983 |
| K30 Kitchens Limited | Wholesale & retail | 2019 |
| K32 Limited | Construction | 2017 |
| K8T Associates Ltd | Professional & scientific | 2015 |
| K8T Limited | Construction | 2004 |
| K9 Instinct Ltd | Manufacturing | 2022 |
| K9OLOGY - Dog Psychology & Training Ltd | Extraterritorial | 2022 |
| K@M Properties Ltd | Real estate | 2025 |
| KA (Westbury) Limited Limited | Hospitality | 2026 |
| KA at Harbour Taverns Ltd | Hospitality | 2025 |
| KA Homes Bristol Ltd | Real estate | 2026 |
| KA Prestige Consultancy Ltd | Professional & scientific | 2024 |
| KAA Property Services Limited | Real estate | 2026 |
| Kaal Tantra Ltd | Extraterritorial | 2026 |
| KAB Finance Limited | Professional & scientific | 2023 |
| KAB Solutions Ltd | Transport & logistics | 2018 |
| Kabab World Bristol Ltd | Hospitality | 2025 |
| Kababji (Knightsbridge) Ltd | Hospitality | 2025 |
| Kababji Enterprises Ltd | Hospitality | 2025 |
| Kababji UK Limited | Hospitality | 2017 |
| Kabby's MGT Limited | Real estate | 2026 |
| Kablink Healthcare Services Limited | Health & social care | 2025 |
| Kaboodal Limited | Wholesale & retail | 2014 |
| Kaboom Electrical Ltd | Construction | 2018 |
| Kabr Ltd | Real estate | 2022 |
| Kabs Construction Ltd | Construction | 2018 |
| Kabul Grill Bristol Ltd | Hospitality | 2025 |
| Kacey Displays Limited | | 1987 |
| Kachyrik Limited | Health & social care | 2023 |
| Kadampa Meditation Centre Bristol Ltd | Other services | 1992 |
| Kadiem Group Ltd | Financial services | 2016 |
| Kadir Consultancy Limited | Information & communication | 2020 |
| Kadiye Transport Limited | Transport & logistics | 2019 |
| Kadu Motorcycle Ltd | Wholesale & retail | 2023 |
| Kagami Limited | Professional & scientific | 2026 |
| Kage Ltd | Information & communication | 2015 |
| Kahadem Ltd | Real estate | 2025 |
| Kahu Properties Ltd | Real estate | 2023 |
| KAI Infomed Ltd | Administrative & support | 2017 |
| Kaia Digitech Ltd | Information & communication | 2022 |
| Kaieteur Kare Limited | Health & social care | 2019 |
| Kaiju Content Ltd | Professional & scientific | 2020 |
| Kaimin's Kitchen Ltd | Hospitality | 2022 |
| Kainaat Enterprises Limited | Wholesale & retail | 2026 |
| Kaino Investments Limited | Real estate | 2023 |
| Kairangi Consultancy South West Limited | Information & communication | 2019 |
| Kairos Property Development Ltd | Construction | 2018 |
| Kairos Property Group Ltd | Financial services | 2018 |
| Kairos Property Investments Ltd | Real estate | 2018 |
| Kairos Therapy Services Ltd | Health & social care | 2013 |
| Kaismotorcyclerepair Ltd | Wholesale & retail | 2025 |
| Kaiween Limited | Administrative & support | 2014 |
| Kaizen Blog Ltd | Other services | 2025 |
| Kaizen Build Ltd | Construction | 2022 |
| Kaizen Innovative Technologies Ltd | Information & communication | 2019 |
| Kaizen Kloud Consulting Ltd | Information & communication | 2023 |
| Kaizen Limited | Professional & scientific | 2019 |
| Kaizen Resourcing Ltd | Administrative & support | 2025 |
| Kaizen Specialist Motors Ltd | Wholesale & retail | 2026 |
| Kajak Deliveries Ltd | Transport & logistics | 2025 |
| Kajl Trans Ltd | Transport & logistics | 2013 |
| Kaka Khail Properties Limited | Real estate | 2024 |
| Kako Taxi Ltd | Transport & logistics | 2026 |
| KAL Dosa (PVT) Ltd | Hospitality | 2022 |
| Kala Power Limited | Energy | 2010 |
| Kalaco Group Limited | Professional & scientific | 2019 |
| Kalahari Cooling Limited | Construction | 2019 |
| Kalar Bristol Ltd | Wholesale & retail | 2019 |
| Kalayci Homes Limited | Real estate | 2020 |
| Kaleem Chronicles Ltd | Wholesale & retail | 2025 |
| Kaleido Art and Framing Ltd | Manufacturing | 2026 |
| Kaleido Grafik Limited | Professional & scientific | 2014 |
| Kaleidoscoop Gelato Laboratory Ltd | Manufacturing | 2022 |
| Kaleidoscoop Ltd | Extraterritorial | 2022 |
| Kaleidoscope Eyes Limited | Professional & scientific | 2013 |
| Kalevent Limited | Information & communication | 2023 |
| Kalibrate Acquisition Limited | Financial services | 2017 |
| Kalisi Construction Ltd | Construction | 2017 |
| Kalispera Limited | Hospitality | 2008 |
| Kally Hayes Limited | Other services | 2025 |
| Kalp Private Limited | Wholesale & retail | 2024 |
| Kalunlaudesign Limited | Professional & scientific | 2015 |
| Kalver Limited | Professional & scientific | 2012 |
| Kalzip Limited | Manufacturing | 1987 |
| KAM Light Tech Ltd | Information & communication | 2022 |
| KAM Maintenance Ltd | Construction | 2026 |
| KAM Trucking Ltd | Transport & logistics | 2022 |
| Kamakshe Fasteners and Tools Limited | Manufacturing | 2019 |
| Kamal Anna Enterprises Ltd | Wholesale & retail | 2017 |
| Kamara Casting Ltd | Arts & recreation | 2026 |
| Kamara Photography Ltd | Professional & scientific | 2026 |
| Kambe Events Limited | Arts & recreation | 2005 |
| Kambe Events Trustees Limited | Professional & scientific | 2026 |
| Kamdan Services Limited | Transport & logistics | 2023 |
| Kameur Ltd | Real estate | 2024 |