| Karting (Northampton) Limited | Arts & recreation | 2016 |
| Karting (Plymouth) Limited | Arts & recreation | 2026 |
| Karting (York) Limited | Arts & recreation | 2023 |
| Karty-Kare Ltd | Health & social care | 2022 |
| Karukéra Destinations Ltd. | Other services | 2016 |
| Karum Foods Ltd | Hospitality | 2022 |
| Karvan Motors Ltd | Wholesale & retail | 2026 |
| Karwan E Umul Baneen A.S Ltd | Wholesale & retail | 2017 |
| Karwan Sheeryakh (Birmingham) Ltd | Hospitality | 2024 |
| Karwan Tools Ltd | Administrative & support | 2023 |
| Karzan International Limited | Real estate | 1997 |
| KAS & Co. (UK) Limited | Professional & scientific | 2003 |
| KAS Associatie N.V. Limited | Financial services | 2014 |
| KAS Automotive Ltd | Wholesale & retail | 2025 |
| KAS Care Services Ltd | Health & social care | 2024 |
| KAS Equipment Ltd | Wholesale & retail | 2025 |
| KAS Hussain Properties Ltd | Real estate | 2026 |
| KAS Logistics Limited | Transport & logistics | 2019 |
| KAS Makuta Service Ltd | Transport & logistics | 2018 |
| KAS Pubs Ltd | Hospitality | 2022 |
| Kasa & Co Estate Agents Ltd | Real estate | 2025 |
| Kasa Logistics Limited | Transport & logistics | 2024 |
| Kasam Limited | Real estate | 2026 |
| Kasdon (Holdings) Limited | Financial services | 2003 |
| Kasdon Electronics Limited | Manufacturing | 1997 |
| Kase Hotel Limited | Hospitality | 2000 |
| Kasezi Housing Ltd | Health & social care | 2025 |
| Kasgumma Investments Ltd | Real estate | 2026 |
| Kash Car Ltd | Wholesale & retail | 2020 |
| Kash IT Brit Ltd | Wholesale & retail | 2026 |
| KASH360 Ltd | Transport & logistics | 2017 |
| Kashar Engineering Ltd | Construction | 2013 |
| Kashemranu Ltd | Wholesale & retail | 2026 |
| Kashfox Ltd | Information & communication | 2024 |
| Kashi Property Limited | Real estate | 2024 |
| Kashif Jawad Ltd | Wholesale & retail | 2025 |
| Kashif Mahmood Collections Ltd | Wholesale & retail | 2025 |
| Kashke World of Fashion Ltd | Wholesale & retail | 2019 |
| Kashmak Ltd | Transport & logistics | 2024 |
| Kashmir Bloom Ltd | Wholesale & retail | 2025 |
| Kashmir Broadcasting Corporation Ltd | Information & communication | 2011 |
| Kashmir Catering Midlands Ltd | Hospitality | 2021 |
| Kashmir Collection Ltd | Wholesale & retail | 2026 |
| Kashmir Cottage Limited | Hospitality | 2006 |
| Kashmir Fast Food & Curry House Ltd | Hospitality | 2024 |
| Kashmir Forum | Extraterritorial | 1998 |
| Kashmir Grill & Pizza Ltd | Hospitality | 2024 |
| Kashmir Halal Catering Butchers Limited | Wholesale & retail | 2012 |
| Kashmir Jewellers Gift Shop Ltd | Wholesale & retail | 2026 |
| Kashmir Multimedia Marketing Ltd | Information & communication | 2008 |
| Kashmir Paradise Limited | Hospitality | 1997 |
| Kashmir Property Holdings Limited | Households | 2021 |
| Kashmir Realty Ltd | Real estate | 2023 |
| Kashmir Travel & Services Ltd | Administrative & support | 2020 |
| Kashmir United Travel Ltd | Other services | 2017 |
| Kasi Music UK Ltd | Information & communication | 2026 |
| Kasidas Limited | Health & social care | 2022 |
| Kasim Delivery Ltd | Transport & logistics | 2025 |
| Kasiyamo Ltd | Health & social care | 2013 |
| Kasmal Ltd | Information & communication | 2024 |
| Kasn Ebiz Ltd | Wholesale & retail | 2024 |
| Kasper Kreations Limited | Real estate | 2017 |
| Kasper Property Agency Ltd | Real estate | 2025 |
| Kasper Property Developments Ltd | Real estate | 2024 |
| Kasper Property Group Ltd | Construction | 2022 |
| Kasrabarber Ltd | Other services | 2025 |
| Kass Capital Management Ltd | Financial services | 2022 |
| Kass Property Services Ltd | Real estate | 2019 |
| Kassim Housing Ltd | Real estate | 2025 |
| Kassimvending Ltd | Hospitality | 2026 |
| Kastern Capital Management Limited | Administrative & support | 2008 |
| Kasthle Limited | Wholesale & retail | 2025 |
| Kasuwayo Ltd | Wholesale & retail | 2021 |
| Kata TSE Co. Ltd | Real estate | 2020 |
| Katalyn Ltd | Manufacturing | 2024 |
| Kataria Property Group (London) Limited | Real estate | 2022 |
| Kataria Property Group Limited | Real estate | 2018 |
| Kataria Services Limited | Transport & logistics | 2015 |
| Katarzyna Ltd | Extraterritorial | 2013 |
| Kate & Marcin Wilk Ltd | Health & social care | 2018 |
| Kate E Walker Limited | Extraterritorial | 2011 |
| Kate Pierce Ltd | Arts & recreation | 2026 |
| Kate Smith Jewellery Ltd | Wholesale & retail | 2022 |
| Katej Limited | Transport & logistics | 2022 |
| Kateol Ltd | Transport & logistics | 2016 |
| Katerina Trans Ltd | Transport & logistics | 2015 |
| Kathar Properties Ltd | Real estate | 2025 |
| Kathari Limited | Professional & scientific | 2017 |
| Kathari Nail & Beauty Ltd | Other services | 2022 |
| Katharsis Design Powerhouse Ltd | Wholesale & retail | 2025 |
| Katherine Place Management Company Limited | Households | 2006 |
| Katherine Tromans Design + Illustration Ltd | Information & communication | 2018 |
| Kathleen Maria Clayton Limited | Extraterritorial | 2023 |
| Kathleen Maria O'Dowd Limited | Extraterritorial | 2023 |
| Kathline Ltd | Hospitality | 2005 |
| Kathos Limited | Financial services | 2026 |
| Kathy Daniels Consulting Limited | Administrative & support | 2008 |
| Katie Connolly Content Ltd | Information & communication | 2025 |
| Katiebeks Company Ltd | Health & social care | 2012 |
| Katie’S Kleen’S Ltd | Administrative & support | 2025 |