| Karax Ltd | Construction | 2024 |
| Karine Johnson Image & Style Consultancy Ltd | Professional & scientific | 2025 |
| Karl Morgan Construction Ltd | Construction | 2023 |
| Karma Express Limited | Hospitality | 2022 |
| Karman Technology Co., Ltd | Extraterritorial | 2021 |
| Karol Websky Ltd | Information & communication | 2015 |
| Karoy Williams Limited | Wholesale & retail | 2026 |
| Kartly UK Ltd | Wholesale & retail | 2025 |
| Kasus Group Ltd | Wholesale & retail | 2021 |
| KAT E-Commerce Ltd | Wholesale & retail | 2024 |
| Katali Lodge Ltd | Health & social care | 2026 |
| Katalis Global Ltd | Other services | 2019 |
| Kate Ford Ltd | Wholesale & retail | 2025 |
| Kate Thomas Menopause Ltd | Health & social care | 2026 |
| Katiewear Ltd | Wholesale & retail | 2025 |
| Katula Konsult Limited | Information & communication | 2019 |
| Kaub Property Ltd | Real estate | 2016 |
| Kaunda Custom Jewelry Ltd | Wholesale & retail | 2025 |
| Kaur & Singh Trading Ltd | Wholesale & retail | 2026 |
| KAY Bookkeeping & Financial Management Ltd | Professional & scientific | 2016 |
| KAY J Interiors Limited | Professional & scientific | 2022 |
| KAY Luxury Brands Ltd | Wholesale & retail | 2025 |
| Kayniken International Ltd | Wholesale & retail | 2018 |
| Kbiasfit Ltd | Wholesale & retail | 2025 |
| Kbsj Limited | Information & communication | 2016 |
| KC Sport Management Ltd | Arts & recreation | 2024 |
| Kceblack Ltd | Real estate | 2022 |
| Kceblack Property Ltd | Real estate | 2024 |
| KDK Cleaning Services Ltd | Administrative & support | 2025 |
| KDK Global Limited | Wholesale & retail | 2024 |
| Kdyl Ltd | Wholesale & retail | 2025 |
| KE Ying MEN Trading Limited | Administrative & support | 2022 |
| Kealc Services Ltd | Information & communication | 2015 |
| Keanes Contracts Limited | Construction | 2021 |
| Keanes PS Ltd | Other services | 2016 |
| Keaton Blue Ltd | Real estate | 2024 |
| Kedge & Company Ltd | Administrative & support | 2021 |
| Keele Property Services Ltd | Real estate | 2025 |
| Keetec Limited | Professional & scientific | 2017 |
| Keith Hollamby Flooring Limited | Construction | 2016 |
| Keith Littlewood Consulting Limited | Health & social care | 2023 |
| KEL Napa Ltd | Health & social care | 2019 |
| Keleeshe Ltd | Wholesale & retail | 2023 |
| Keli Machine Co., Ltd | Wholesale & retail | 2024 |
| Kelmanor Joint Properties Ltd | Financial services | 2026 |
| Kelsyn Group Limited | Wholesale & retail | 2025 |
| Kelyni Ltd | Administrative & support | 2026 |
| Kemicare Ltd | Health & social care | 2025 |
| Kemulezf Co., Ltd | Wholesale & retail | 2025 |
| Kenbon Ltd | Wholesale & retail | 2025 |
| Kendric Fuller Ltd | Wholesale & retail | 2025 |
| Kengesbeg Limited | Wholesale & retail | 2025 |
| Kenlang Weeroona Ltd | Wholesale & retail | 2025 |
| Kennaston Longview Ltd | Wholesale & retail | 2025 |
| Kenny & Joe's Bakes Limited | Hospitality | 2022 |
| Kensei London Ltd | Wholesale & retail | 2023 |
| Kenspeckle Ltd | Financial services | 2013 |
| Kensrey Hill Ltd | Manufacturing | 2025 |
| Kent Maintenance and Services Limited | Construction | 2024 |
| Kenton Hughes Limited | Construction | 2003 |
| Kenvana Ltd | Administrative & support | 2025 |
| Kenza Marketing Ltd | Professional & scientific | 2024 |
| Keox Limited | Other services | 2018 |
| Kerams Ltd | Professional & scientific | 2023 |
| Kerrieliburd Trading Ltd | Wholesale & retail | 2025 |
| Kerry Harris Ltd | Professional & scientific | 2014 |
| Ketbon Innocation Ltd | Wholesale & retail | 2024 |
| Kevin Anderson Limited | Real estate | 2023 |
| Kevin Anderson Partnership LLP | | 2025 |
| Kevin Hunn Associates Limited | Professional & scientific | 2021 |
| Kevin James Decorating Ltd | Construction | 2019 |
| Key Holder Property Limited | Real estate | 2024 |
| KEY23 Ltd | Wholesale & retail | 2025 |
| Keyida Trading Co., Ltd | Administrative & support | 2022 |
| Keyone Group Limited | Wholesale & retail | 2025 |
| Keystone Infrastructure Group Ltd | Professional & scientific | 2026 |
| Keyus Trading Co., Ltd | Wholesale & retail | 2024 |
| KFS Hereford Limited | Wholesale & retail | 2017 |
| KGG Real Estate Ltd | Real estate | 2025 |
| Khai Global Investments Ltd | Wholesale & retail | 2026 |
| Khalid Malik Ltd | Wholesale & retail | 2024 |
| Khalifah International Group Co., Ltd | Manufacturing | 2025 |
| Khalil Trading Co Ltd | Wholesale & retail | 2020 |
| Khalis House Publishing Ltd | Information & communication | 2020 |
| Khamtech Ltd | Other services | 2024 |
| Khaos Entertainment Ltd | Information & communication | 2026 |
| Khazina Ltd | Health & social care | 2025 |
| Khewra Energetics Ltd | Other services | 2021 |
| Khiimori Travel Ltd | Administrative & support | 2026 |
| Khuer Industrial Co., Ltd | Extraterritorial | 2018 |
| Kibun Ltd. | Professional & scientific | 2017 |
| Kidda Ltd | Education | 2025 |
| Kidsnav Ltd | Wholesale & retail | 2019 |
| Kiel Consulting Group Ltd | Information & communication | 2025 |
| Kihem Holy Throne of the Most High GOD on Earth Mission | Other services | 2016 |
| Kiko International Limited | Wholesale & retail | 2025 |
| Kikolina Ltd | Manufacturing | 2025 |
| Kilada Ltd | Other services | 2018 |
| Killearnan Innovations Ltd | Information & communication | 2026 |
| Killwhy Creative Design Co., Ltd | Wholesale & retail | 2026 |