| KEN Simmons Transport Ltd | | 2009 |
| KEN the Plumber Ltd | Construction | 2011 |
| Kena Limited | Health & social care | 2019 |
| Kenchenten Limited | Professional & scientific | 2021 |
| Kenda Electronic Systems Limited | Manufacturing | 1976 |
| Kenda Group (UK) Limited | Professional & scientific | 2009 |
| Kendall Letting Ltd | Hospitality | 2023 |
| Kendata Peripherals Limited | Manufacturing | 1979 |
| Kendis Group Ltd | Hospitality | 2021 |
| Kenilworth Lodge (Waverley Road) Management Limited | Real estate | 1974 |
| Kenito Ltd | Health & social care | 2015 |
| Kenna Maintenance Limited | Construction | 2026 |
| Kenneth Court Management Company Limited | Households | 2006 |
| Kenreg LLP | | 2017 |
| Kens Kebab House (Havant) Limited | Real estate | 2001 |
| Kens Kebabs & Speedy Pizza Limited | Extraterritorial | 2025 |
| Kensington Bathrooms Limited | Construction | 2017 |
| Kensington Business Sales Limited | Financial services | 2023 |
| Kensington Fields RTM Company Limited | Real estate | 2021 |
| Kensington Land Limited | Real estate | 2025 |
| Kensington Properties (Southern) Limited | Real estate | 2004 |
| Kenyatta Ltd | Hospitality | 2025 |
| Kernow Shepherd Huts Limited | Extraterritorial | 2021 |
| Kerry Gardner Management Limited | Professional & scientific | 1997 |
| Kerry Homes Ltd | Real estate | 2023 |
| Kersley Gardens Management Company Limited | Households | 2015 |
| Kertz Ltd | Wholesale & retail | 2016 |
| Kerus Homes Limited | Construction | 2014 |
| KES Bookings Ltd | Real estate | 2017 |
| Keshav Group Limited | Wholesale & retail | 2025 |
| Kessler (NH) Holdings Limited | Administrative & support | 2017 |
| Kessler (NH) Limited | Administrative & support | 2018 |
| Keston Investments Limited | Real estate | 2001 |
| Kestrel (MS) Limited | Financial services | 2020 |
| Kestrel Court (Freehold) Ltd | Households | 2023 |
| Kestrel Court (Sherborne) Ltd | Households | 2023 |
| Kestrel Electronic Security Limited | Administrative & support | 2016 |
| Kestrel Guards Limited | Administrative & support | 1988 |
| Keswick Pictures Limited | Information & communication | 2021 |
| Ketch Rigger Limited | Hospitality | 2018 |
| Ketos Holdings Ltd | Financial services | 2022 |
| Kettston Limited | Wholesale & retail | 2026 |
| KEV Knight Ltd | Administrative & support | 2019 |
| Kevclean Cleaning and Facility Services Ltd | Professional & scientific | 2025 |
| Kevclean Medical Limited | Administrative & support | 2021 |
| Kevin Cull Financial Services Ltd | Financial services | 2019 |
| Kevin Mitchell Consulting Engineers Ltd | Professional & scientific | 2023 |
| Kevn Ltd | Professional & scientific | 2023 |
| Key Essentials Ecommerce Ltd | Wholesale & retail | 2024 |
| Key Production Equipment Limited | Wholesale & retail | 2009 |
| Key Property Sourcing Ltd | Real estate | 2024 |
| Key Security Products Ltd | Wholesale & retail | 2014 |
| Key Yachting Ltd | Wholesale & retail | 1997 |
| Keygrove Commercial Limited | Administrative & support | 2000 |
| Keyhole Capital Ltd | Real estate | 2025 |
| Keylogic Limited | Information & communication | 1997 |
| Keysec Consulting Ltd | Information & communication | 2025 |
| Keystone Care Group Limited | Health & social care | 2023 |
| Keystone UK Group Ltd | Financial services | 2026 |
| Keystroke Accountancy Services Limited | Professional & scientific | 2003 |
| Keywe Property MGT Limited | Administrative & support | 2025 |
| Keyworth Holdings Limited | Real estate | 2018 |
| Keyworth Properties Limited | Real estate | 1996 |
| KEZIA9602 Ltd | Transport & logistics | 2026 |
| KF Handyman Ltd | Other services | 2012 |
| KF Healthcare Ltd | Education | 2024 |
| KG Paint Sprayers Limited | Construction | 2024 |
| Kghr Properties Ltd | Real estate | 2022 |
| KGM Marine Holdings Ltd | Administrative & support | 2024 |
| KGM Marine Services Ltd | Administrative & support | 2021 |
| Kgola Limited | Health & social care | 2020 |
| KGR Building Services Ltd | Construction | 2024 |
| KH Marine Ltd | Education | 2024 |
| KHA Couriers Limited | Transport & logistics | 2021 |
| Khagesh Limited | Real estate | 2022 |
| Khaira Accommodation Ltd | Real estate | 2024 |
| Khaira Cars Limited | Wholesale & retail | 2024 |
| Khaira Estates Ltd | Real estate | 2025 |
| Khaira Motors Limited | Wholesale & retail | 2019 |
| Khaira Property Group Limited | Real estate | 2025 |
| Khairan Limited | Hospitality | 2023 |
| Khalids Retail Ltd | Wholesale & retail | 2025 |
| Khan Apex Ltd | Wholesale & retail | 2026 |
| Khan Uber Ltd | Transport & logistics | 2019 |
| Khan Varieties Fashion Limited | Wholesale & retail | 2022 |
| Khana Baba Ltd | Wholesale & retail | 2022 |
| Kharak Consultancy Limited | Professional & scientific | 2012 |
| Kharak Lettings Limited | Real estate | 2022 |
| KHD Residential Ltd | Real estate | 2024 |
| Khdp LLP | | 2016 |
| Khorasan Construction Ltd | Construction | 2022 |
| KHS Investments and Legal Ltd | Real estate | 2024 |
| Khurram Investments Ltd | Real estate | 2026 |
| Khyco Limited | Construction | 2016 |
| Kiana Private Ltd | Hospitality | 2026 |
| Kiatoha Limited | Real estate | 2017 |
| Kibre Holdings Limited | Financial services | 2026 |
| Kibre Limited | Construction | 2012 |
| Kick Lining Hotels Ltd | Hospitality | 2025 |
| Kick-Ass Naturals Ltd | Wholesale & retail | 2025 |