| Kevin Mackay Transport Ltd | Transport & logistics | 2022 |
| Kevinluzo Ltd | Arts & recreation | 2019 |
| KEW Property Consultants Limited | Professional & scientific | 2015 |
| Kewl Co Ltd | Information & communication | 2009 |
| Key and Lime Limited | Construction | 2024 |
| Key Buy Store Ltd | Wholesale & retail | 2025 |
| Key Coin Assets Ltd | Other services | 2018 |
| Key Concept Corporation | Information & communication | 2023 |
| Key Concept Solutions Ltd | Professional & scientific | 2018 |
| Key Developments UK1 Ltd | Construction | 2023 |
| Key Health 2 Wellness Ltd | Health & social care | 2025 |
| Key Law Limited | Extraterritorial | 2011 |
| Key LET 1 Limited | Professional & scientific | 2005 |
| Key LET 2 Limited | Professional & scientific | 2005 |
| Key Management Limited | Professional & scientific | 2010 |
| Key Opportunities Ltd | Financial services | 2021 |
| Key-Turn Sales & Lettings Ltd | Real estate | 2025 |
| KEY2CLEAN Ltd | Administrative & support | 2019 |
| Keybank Ltd | Extraterritorial | 2008 |
| Keybaron Limited | Health & social care | 2024 |
| Keyboard Yoga Club Limited | Administrative & support | 2018 |
| Keyla Ltd | Wholesale & retail | 2025 |
| Keyline Property Group Ltd | Real estate | 2025 |
| Keymaster Mobile Locksmiths Limited | Manufacturing | 2025 |
| Keymead Transport Limited | Extraterritorial | 1980 |
| Keymove Bradford Ltd | Real estate | 2017 |
| Keynotesdev Ltd | Information & communication | 2020 |
| Keys Residentials (Cardiff) Ltd | Real estate | 2021 |
| Keyse Distribution Ltd | Wholesale & retail | 2025 |
| Keystone Refurb Ltd | Construction | 2024 |
| Keystones Collectives Limited | Professional & scientific | 2025 |
| Keyta Ltd | Wholesale & retail | 2025 |
| Keytech Developments Ltd | Construction | 2019 |
| Keyvapour Holdings Ltd | Financial services | 2024 |
| Kezby Homes Limited | Real estate | 2024 |
| KF Yates Ltd | Administrative & support | 2021 |
| KFG Properties Limited | Real estate | 2017 |
| KFK Limited | Professional & scientific | 2025 |
| KG Accounts & Tax Ltd | Professional & scientific | 2018 |
| KG Asset Management Ltd | Financial services | 2018 |
| KG Culinary Recruitment Ltd | Extraterritorial | 2019 |
| KG Educational Psychology Services Ltd | Education | 2024 |
| KG Subs Ltd | Hospitality | 2018 |
| Kg&S Group Ltd | Manufacturing | 2025 |
| KGE Asset Management Consulting Limited | Professional & scientific | 2011 |
| KGL Electrical & Suppliers Ltd | Administrative & support | 2017 |
| KGO Limited | Wholesale & retail | 2023 |
| Kgsubsow Ltd | Hospitality | 2020 |
| Kgwc Limited | Administrative & support | 2020 |
| KH Consultants LLP | | 2017 |
| KH Handyman Services Ltd | Manufacturing | 2025 |
| Khabas Property Ltd | Real estate | 2025 |
| Khadrafx Ltd | Professional & scientific | 2025 |
| Khafes Ltd | Wholesale & retail | 2025 |
| Khaleejecom Ltd | Wholesale & retail | 2025 |
| Khalid Solutions Ltd | Wholesale & retail | 2025 |
| Khalidanalyst Ltd | Information & communication | 2025 |
| Khalidhym Ltd | Professional & scientific | 2017 |
| Khalifa R&S Limited | Health & social care | 2022 |
| Khalix Ltd | Wholesale & retail | 2025 |
| Khan Awal Properties Ltd | Real estate | 2020 |
| Khan Exective Travel Ltd | Transport & logistics | 2020 |
| Khan Food Stores (Cardiff) Ltd | Wholesale & retail | 2018 |
| Khan Halal Luton Ltd | Wholesale & retail | 2019 |
| Khan Malik Holdings Limited | Construction | 2026 |
| Khan Mart Ltd | Wholesale & retail | 2026 |
| Khan MK Ltd | Wholesale & retail | 2026 |
| Khan Optical Ltd | Health & social care | 2026 |
| Khan PPI Limited | Administrative & support | 2013 |
| Khan Worldwide Ltd | Wholesale & retail | 2023 |
| Khan Zadi Ltd | Wholesale & retail | 2026 |
| Khana Limited | Hospitality | 2005 |
| Khandi Ghor Limited | Hospitality | 2019 |
| Khanfa Trade Ltd. | Wholesale & retail | 2021 |
| Khanishka Consultants Ltd | Information & communication | 2013 |
| Khanns Limited | Wholesale & retail | 2018 |
| Khans Accessories Cardiff Limited | Wholesale & retail | 2022 |
| Khans UK Properties Ltd | Real estate | 2022 |
| Khanzada Import and Export Ltd | Wholesale & retail | 2009 |
| Khattak Traders Limited | Wholesale & retail | 2025 |
| Khayafrika Ltd | Information & communication | 2021 |
| Khaznah Strategies Limited | Professional & scientific | 2009 |
| KHB Pharma Ltd | Wholesale & retail | 2021 |
| Khbiz Limited | Information & communication | 2014 |
| Khelifa Ltd | Wholesale & retail | 2025 |
| Kherreet Ltd | Information & communication | 2026 |
| KHF Building & Landscaping Ltd | Construction | 2019 |
| Khimtec Ltd | Wholesale & retail | 2025 |
| Khione Ltd | Wholesale & retail | 2021 |
| Khitsolutions Limited | Information & communication | 2019 |
| Khiz Tech Ltd | Information & communication | 2015 |
| Khksystems Ltd | Information & communication | 2014 |
| Khokhar Mart Ltd | Wholesale & retail | 2025 |
| Khoshooee Ltd | Health & social care | 2021 |
| Khosi Practitioner Consultancy Ltd | Health & social care | 2020 |
| Khoubaz Ltd | Other services | 2022 |
| KHR Investments Limited | Real estate | 2015 |
| Khubeb UR Raheman Ltd | Wholesale & retail | 2025 |
| Khumb Neng Traders Ltd | Financial services | 2020 |
| Khurrianwala Property Ltd | Real estate | 2020 |