| Karl Gaffney Limited | Health & social care | 2010 |
| Karl Young Building Ltd | Construction | 2025 |
| Karma Junction Ltd | Wholesale & retail | 2024 |
| Karma Technologies International Limited | Other services | 2018 |
| Karma Trade Limited | Hospitality | 2016 |
| Karmaa Ltd | Wholesale & retail | 2025 |
| Karol Staszewski Ltd | Transport & logistics | 2023 |
| Karshan Ltd | Wholesale & retail | 2024 |
| Karta Purakh Estates Limited | Real estate | 2026 |
| Karthishivaa Limited | Health & social care | 2022 |
| KAS Architecture and Interior Design Ltd | Professional & scientific | 2014 |
| Kashmir Gloucestershire Limited | Hospitality | 2018 |
| Kashmir Tandoori (Edwinstowe) Limited | Hospitality | 2016 |
| Kasi Solutions Limited | Wholesale & retail | 2025 |
| Kassian Ltd | Other services | 2018 |
| Kastner Kitchens & Interiors Ltd | Wholesale & retail | 2017 |
| Katalyst Communications Ltd | Manufacturing | 2003 |
| Katan Norwich Ltd | Wholesale & retail | 2024 |
| Katana 3D Ltd | Manufacturing | 2026 |
| Kate Fearnley Ltd | Manufacturing | 2003 |
| Kate Lindsay Consulting Limited | Professional & scientific | 2025 |
| Kate-Marie Travis Therapies Ltd | Health & social care | 2022 |
| Kateville Healthcare Limited | Health & social care | 2019 |
| Kath Mullock Home Care Limited | Health & social care | 2015 |
| Katherine Grant Consultancy Ltd | Education | 2024 |
| Kathleen Blades Limited | Health & social care | 2025 |
| Kathryn Woodeson Limited | Professional & scientific | 2010 |
| Katie Lulei Ltd | Information & communication | 2022 |
| Katie Otto Hair Ltd | Other services | 2024 |
| Katie Robotkin (London) Limited | Professional & scientific | 2017 |
| Katnik Properties Limited | Real estate | 2016 |
| Kav's Collection Ltd | Wholesale & retail | 2025 |
| Kavanal Limited | Health & social care | 2014 |
| Kavita Golia Ltd | Other services | 2015 |
| KAY Properties Limited | Extraterritorial | 2011 |
| KAY Tonks Limited | Professional & scientific | 2010 |
| Kay-Wonderland Consult Ltd | Health & social care | 2024 |
| Kayex UK PTY Ltd | Wholesale & retail | 2020 |
| Kayma Ltd | Financial services | 2022 |
| Kayman Medical Limited | Health & social care | 2025 |
| KAZ Interiors Ltd | Professional & scientific | 2020 |
| KB Auto Recovery Ltd | Transport & logistics | 2022 |
| KB Composites Ltd | Manufacturing | 2025 |
| KB Consultancy Ltd | Construction | 2025 |
| KB Face Contour Aesthetics Ltd | Other services | 2020 |
| KB Ministries Limited | Information & communication | 2020 |
| KB Peaks Limited | Real estate | 2022 |
| KB Recycling Ltd | Manufacturing | 2017 |
| KB Services (East) Ltd | Construction | 2026 |
| KB Video & Photography Ltd | Professional & scientific | 2023 |
| Kbeverage Ltd | Hospitality | 2015 |
| Kbis Real Estate Limited | Real estate | 2024 |
| KBR Solutions Ltd | Real estate | 2020 |
| Kbrand Stores Ltd | Wholesale & retail | 2024 |
| KBS Holdings (Norfolk) Limited | Financial services | 2016 |
| KBS Installations Services UK Limited | Other services | 2018 |
| KBS Property Services Limited | Real estate | 2024 |
| KC Advisory Ltd | Professional & scientific | 2017 |
| KC Electrical Contracting Ltd | Construction | 2021 |
| KC Electrical Services North Norfolk Ltd | Construction | 2023 |
| KC Legal Recruitment Limited | Administrative & support | 2026 |
| KC Norfolk Limited | Real estate | 2024 |
| KCC Acquisitions Limited | Real estate | 2003 |
| KCM Plumbing Limited | Construction | 2008 |
| KCR Trading Limited | Manufacturing | 2011 |
| Kcrp Limited | Administrative & support | 2021 |
| KCS Leisure Ltd | Wholesale & retail | 2023 |
| Kcsr Ltd | Wholesale & retail | 2022 |
| KCX Trading Ltd | Wholesale & retail | 2021 |
| KD Builders (U.K.) Limited | Construction | 2019 |
| KD Tech Solutions Ltd | Information & communication | 2023 |
| KD Vada PAV Ltd | Hospitality | 2026 |
| Kdevelopment Ltd | Construction | 2020 |
| KDG Building Ltd | Construction | 2025 |
| KDL Building Solutions Ltd | Construction | 2014 |
| KDT Wealth Management Ltd | Financial services | 2025 |
| Keable Partnership Ltd | Health & social care | 2025 |
| Kear Decorating Ltd | Other services | 2017 |
| Keatmay Metal Coatings Limited | Manufacturing | 2017 |
| KEB Consulting Services Ltd | Information & communication | 2022 |
| Keda Brands (UK) Limited | Hospitality | 2018 |
| KEE Cleaning Services Limited | Administrative & support | 2023 |
| KEE Holiday Homes Limited | Hospitality | 2024 |
| KEE Installations Limited | Wholesale & retail | 2006 |
| Keefe Properties Ltd | Real estate | 2024 |
| Keeler Recruitment Limited | Administrative & support | 2019 |
| Keelers Property Developments Limited | Construction | 2018 |
| Keeltrade Limited | Administrative & support | 1993 |
| Keely Print Limited | Manufacturing | 1999 |
| Keen Getty Hunt Holdings Ltd | Wholesale & retail | 2023 |
| Keep Hospitality Group Ltd | Hospitality | 2018 |
| Keep IT Clean (EKS) Ltd | Administrative & support | 2022 |
| Keep IT Occupied Ltd | Information & communication | 2020 |
| Keep M Moving Ltd | Transport & logistics | 2025 |
| Keep on a Troshin Ltd | Real estate | 2020 |
| Keep on Housing Ltd | Real estate | 2022 |
| Keeper's Daughter CIC | Administrative & support | 2022 |
| Keeping Abreast | Health & social care | 2009 |
| KEG Ltd | Construction | 2023 |
| Keiday Transport Ltd | Transport & logistics | 2025 |