| Komo Wealth Ltd | Financial services | 2013 |
| Kompact Rail Ltd. | Construction | 2018 |
| Kompact Solutions Group Ltd | Financial services | 2024 |
| Kompact Structures Ltd | Construction | 2024 |
| Komplete Limited | Transport & logistics | 2010 |
| Komprihend Ltd | Information & communication | 2022 |
| Konadu's Family Healthcare Ltd | Health & social care | 2015 |
| KONAR7 Ltd | Health & social care | 2020 |
| Konday&Co Ltd | Health & social care | 2014 |
| Kondi Ltd | Wholesale & retail | 2011 |
| Kondor Ceramic Ltd | Manufacturing | 2024 |
| Konekt.Work Limited | Professional & scientific | 2022 |
| Kong Mart Limited | Wholesale & retail | 2024 |
| Kongsberg Norcontrol Limited | Manufacturing | 1989 |
| Kongtrans Global Limited | Transport & logistics | 2019 |
| Konk Furniture Limited | Manufacturing | 2016 |
| Konk Group Limited | Financial services | 2023 |
| Konnectedld Ltd | Education | 2025 |
| Konsey Ltd | Hospitality | 2026 |
| Konta Wade Limited | Arts & recreation | 2016 |
| Konzept Kitchens Limited | Manufacturing | 2021 |
| Koocha Limited | Hospitality | 2018 |
| Kook Tables Limited | Hospitality | 2021 |
| Kool Clear (UK) Ltd | Administrative & support | 2019 |
| Koolwaters Agency Ltd | Arts & recreation | 2018 |
| KOP79 Consulting Ltd | Information & communication | 2018 |
| KOR Therapy Practice Limited | Health & social care | 2025 |
| Kordale Consultancy Limited | Professional & scientific | 2025 |
| Kore Construction Limited | Construction | 2009 |
| Kore DEV Ltd | Professional & scientific | 2019 |
| Kore Plant Limited | Construction | 2015 |
| Kore Property Rentals Limited | Real estate | 2020 |
| Kore Surveys Ltd | Professional & scientific | 2023 |
| Korean BBQ Bristol Limited | Hospitality | 2022 |
| Korimako Ltd | Information & communication | 2023 |
| Korkmaz Kebab Ltd | Hospitality | 2026 |
| Kormos Roofing Ltd | Construction | 2020 |
| Korro Limited | Information & communication | 2013 |
| Koru Capital Limited | Financial services | 2025 |
| Koru Coffee Ltd | Wholesale & retail | 2025 |
| Koru Digital Limited | Information & communication | 2021 |
| Koru Directions Limited | Professional & scientific | 2014 |
| Korudaz Limited | Information & communication | 2010 |
| Kosakum Ltd | Health & social care | 2022 |
| Kosar Coaching and Consultancy Limited | Professional & scientific | 2020 |
| Kosend Limited | Professional & scientific | 2025 |
| Koshape Limited | Information & communication | 2026 |
| Kosher Futures C.I.C. | Education | 2025 |
| Kosher Kars Ltd | Wholesale & retail | 2025 |
| Kosho Ltd | Professional & scientific | 2022 |
| Kosie Motion Limited | Information & communication | 2014 |
| Kosmim Ltd | Wholesale & retail | 2025 |
| Kostadinov 93 Ltd | Other services | 2024 |
| Kostüme Limited | Wholesale & retail | 2020 |
| Kotek Construction Ltd | Transport & logistics | 2021 |
| Kottu HUT Grab & Go Limited | Hospitality | 2024 |
| Kottu HUT Ltd | Hospitality | 2022 |
| Koupparis Medical Limited | Health & social care | 2019 |
| Kove Architects Ltd | Professional & scientific | 2007 |
| Kove Life Limited | Construction | 2024 |
| Kovitek Solutions Ltd | Information & communication | 2023 |
| Kowita Consultants Limited | Professional & scientific | 2026 |
| Koxo Ltd | Wholesale & retail | 2026 |
| Kozo Structures Limited | Professional & scientific | 2025 |
| KP Carpentry Services Ltd | Construction | 2016 |
| KP Clothing Limited | Wholesale & retail | 2017 |
| KP Consulting Partners Limited | Professional & scientific | 2013 |
| KP Payroll and Accountancy Limited | Professional & scientific | 2022 |
| KP Stone Surfaces Ltd | Manufacturing | 2020 |
| Kp&Sr Limited | Wholesale & retail | 2023 |
| KPD Veterinary Surgery South West Limited | Professional & scientific | 2018 |
| KPF Holding Limited | Manufacturing | 2020 |
| KPF Investment Management Ltd | Administrative & support | 2017 |
| KPG Pharma Ltd | Wholesale & retail | 2024 |
| Kpkj Limited | Other services | 2026 |
| KPM Windows Ltd | Wholesale & retail | 2024 |
| Kpmtn Limited | Real estate | 2023 |
| KPN Transport Limited | Transport & logistics | 2016 |
| KPW Homes Ltd | Construction | 2007 |
| KPW Property Partnership LLP | | 2021 |
| KQ Estate Management Company Limited | Households | 2022 |
| KQ Hotel Management Company NO. 2 Limited | Households | 2023 |
| Kr&Co Ltd | Real estate | 2025 |
| KRA Assets Ltd | Real estate | 2022 |
| Kraft Sustainable Solutions Ltd | Professional & scientific | 2025 |
| Krakus Polish Shop Limited | Wholesale & retail | 2022 |
| Kraskatrans Ltd | Transport & logistics | 2021 |
| Kray Investments Ltd | Real estate | 2024 |
| KRD Tax & Accountancy Services Limited | Professional & scientific | 2017 |
| Kre$Cendo Ltd | Extraterritorial | 2026 |
| Kredu Limited | Health & social care | 2012 |
| Kremenaros Ltd | Information & communication | 2021 |
| KRG Construction (South West) Limited | Construction | 2023 |
| Kriger Global Solutions Ltd | Administrative & support | 2025 |
| Kris Nock Services Ltd | Professional & scientific | 2017 |
| Krisan Services Ltd | Wholesale & retail | 2022 |
| Krishna Trading (Bristol) Ltd | Wholesale & retail | 2015 |
| Krishnaa (UK) Limited | Wholesale & retail | 2013 |
| Krispyhouse Ltd | Information & communication | 2018 |
| Kriss Cleaning Ltd | Administrative & support | 2019 |