| K W Partnership Limited | Administrative & support | 1994 |
| K&A Smart Solutions Ltd | Wholesale & retail | 2026 |
| K&H Healthcare Ltd | Wholesale & retail | 2021 |
| K&L Maintenance Services Ltd | Professional & scientific | 2025 |
| K.Jones Limited | Extraterritorial | 2024 |
| K.M.A (Telford) Ltd | Education | 2023 |
| KA Housing Investments Ltd | Real estate | 2024 |
| Kaanz Property Investment Ltd | Real estate | 2024 |
| Kabirsabirpharma Ltd | Wholesale & retail | 2017 |
| Kabirsabirprop Ltd | Real estate | 2020 |
| Kabirsabirtrade Ltd | Wholesale & retail | 2025 |
| KAH Management Consultants Ltd | Professional & scientific | 2025 |
| KAH Management Services Ltd | Professional & scientific | 2022 |
| Kairat Ltd | Wholesale & retail | 2019 |
| Kalash H R Limited | Professional & scientific | 2015 |
| Kale Consultants Limited | Administrative & support | 2019 |
| Kaler Superstore Limited | Wholesale & retail | 2022 |
| Kaleta Coaching & Wellness Limited | Administrative & support | 2021 |
| Kaleta Legal Ltd | Professional & scientific | 2026 |
| Kalidescope Limited | Information & communication | 2001 |
| Kaluga Ltd | Other services | 2019 |
| KAM SIP N Shop Ltd | Wholesale & retail | 2025 |
| Kamberbass Limited | Hospitality | 2024 |
| Kambozz Transport Ltd | Transport & logistics | 2025 |
| KAN Healthcare Services Ltd | Health & social care | 2018 |
| Kanar Ltd | Other services | 2019 |
| Kandy Cloudz Ltd | Wholesale & retail | 2025 |
| Kapisom Ltd | Other services | 2019 |
| Kapma Group Ltd | Real estate | 2023 |
| KAR Building Services Limited | Construction | 2017 |
| Karaco Studio Ltd | Arts & recreation | 2025 |
| Karafire Co Ltd | Professional & scientific | 2024 |
| Kardan Premier Women's Healthcare Limited | Health & social care | 2022 |
| Kare Plus Franchising Limited | Health & social care | 2010 |
| Kare Plus International Ltd | Professional & scientific | 2018 |
| Kare Plus Limited | Administrative & support | 1990 |
| Kare Plus National Limited | Health & social care | 2011 |
| Kare Team Ltd | Health & social care | 2014 |
| Karelit Ltd | Other services | 2019 |
| Karl J Paterson Heating & Plumbing Limited | Construction | 2019 |
| Karmanscourier Ltd | Transport & logistics | 2024 |
| Karysol Limited | Professional & scientific | 2012 |
| Kashima Ltd | Administrative & support | 2019 |
| Kaskadare Stunts Limited | Other services | 2014 |
| Kasom Ltd | Health & social care | 2019 |
| Katarya Impex Limited | Wholesale & retail | 2018 |
| Katrina Creates... Ltd | Arts & recreation | 2021 |
| Kawanza Transport Limited | Transport & logistics | 2025 |
| Kayak Transport Limited | Transport & logistics | 2023 |
| Kayani Property Limited | Real estate | 2022 |
| Kayel Activewear Ltd | Wholesale & retail | 2024 |
| Kaylaq Ltd | Health & social care | 2025 |
| Kayn Consultants Limited | Professional & scientific | 2016 |
| Kayn Recruitment Limited | Administrative & support | 2022 |
| KB 23 Ltd | Arts & recreation | 2022 |
| KB Manufacturing Solutions Limited | Professional & scientific | 2020 |
| Kbeb Realty Group Limited | Real estate | 2019 |
| KBS Contractors Limited | Construction | 2018 |
| KBS Distribution Ltd | Wholesale & retail | 2023 |
| KBW Supplies Limited | Wholesale & retail | 2025 |
| KC Care Solutions Ltd | Health & social care | 2020 |
| KC Freight Services Ltd | Transport & logistics | 2025 |
| KC Saunders Construction Ltd | Construction | 2025 |
| KC Wellington Ltd | Real estate | 2024 |
| Kcaf Financial Ltd | Financial services | 2019 |
| KCD Painting Limited | Construction | 2025 |
| KCG Property Limited | Real estate | 2023 |
| KCS Design and Build Ltd | Construction | 2020 |
| KCS Group Holdings Ltd | Financial services | 2024 |
| KCS Trade Roofing and Cladding Ltd | Construction | 2017 |
| KDS LV Solutions Ltd | Extraterritorial | 2023 |
| KDS Power Solutions Limited | Administrative & support | 2011 |
| KDS Solutions Ltd | Manufacturing | 2003 |
| KDT Transport Ltd | Transport & logistics | 2019 |
| KDX Limited | Information & communication | 2022 |
| KEA Automation Limited | Manufacturing | 2009 |
| Keating Retail Limited | Wholesale & retail | 2017 |
| Kebab YE Aksaray 68 Limited | Hospitality | 2021 |
| Kebab YE Dawley Ltd | Hospitality | 2024 |
| Kebbi Ltd | Other services | 2019 |
| Kedd Consulting Limited | Professional & scientific | 2024 |
| Kedd Holdings Limited | Professional & scientific | 2015 |
| Kedd Limited | Professional & scientific | 2015 |
| Keep Safe Northwest Ltd | Extraterritorial | 2014 |
| Keim (UK) Limited | Extraterritorial | 1987 |
| Keim Mineral Paints Limited | Manufacturing | 1989 |
| Keith Trubshaw Limited | Professional & scientific | 2025 |
| Keko Investments Limited | Real estate | 2002 |
| Kelly OCG UK Ltd | Administrative & support | 2023 |
| Kelphix Ltd | Manufacturing | 2026 |
| KEM Assets Limited | Arts & recreation | 2021 |
| Kemberton Car Sales Limited | Wholesale & retail | 2014 |
| Kemberton Property Limited | Real estate | 2021 |
| Kemberton Service Centre Limited | Wholesale & retail | 2020 |
| Kendall & Kendall Limited | Real estate | 2019 |
| Kendall Electrical Services (Telford) Limited | Construction | 1970 |
| Kendall Holdings Limited | Construction | 1990 |
| Kensa Creative Limited | Real estate | 2010 |
| Keppler Homes Ltd | Real estate | 2015 |
| Kerbside Tyres Limited | Wholesale & retail | 2018 |