| Kash Asset Management Ltd | Construction | 2024 |
| Kashicorp Ltd | Real estate | 2024 |
| Kaska (UK) Ltd | Manufacturing | 2009 |
| Kassam Property Ltd | Real estate | 2021 |
| KAT Transport Logistics & Co Ltd | Transport & logistics | 2020 |
| Kate Wild Creative Ltd | Information & communication | 2026 |
| Katharine Cordner Limited | Health & social care | 2013 |
| Katherine Elizabeth Limited | Wholesale & retail | 2018 |
| Kathy Wright Consultancy Ltd | Professional & scientific | 2022 |
| Katya-Yani Ltd | Real estate | 2020 |
| Kauri Apparel Ltd | Wholesale & retail | 2025 |
| Kavya Property UK Investments Limited | Real estate | 2019 |
| KAY Consultancy Limited | Professional & scientific | 2021 |
| KAY Consultancy Services Ltd | Professional & scientific | 2021 |
| KAY Engineering Ltd | Professional & scientific | 2020 |
| KAY Investment Properties Ltd | Real estate | 2024 |
| Kayri Ltd | Professional & scientific | 2025 |
| Kazuma Ltd | Professional & scientific | 2017 |
| KBK Studio Limited | Wholesale & retail | 2020 |
| KC & Thapa Projects Ltd | Hospitality | 2021 |
| KC Carpentry and Building Services Ltd | Manufacturing | 2025 |
| KC Hornchurch Limited | Hospitality | 2019 |
| KC Wheels Limited | Manufacturing | 2023 |
| KCL Finance Consultancy Limited | Professional & scientific | 2018 |
| KCM Holdings Ltd | Financial services | 2020 |
| KCR Professional Services Limited | Professional & scientific | 2014 |
| KCT Food & Beverage Ltd | Hospitality | 2019 |
| KDP Retail Ltd | Wholesale & retail | 2026 |
| KDS Recycling Limited | Water & waste | 2022 |
| KEB Services Ltd | Transport & logistics | 2026 |
| Kebab Yard Ltd | Hospitality | 2025 |
| Kebble Commissioning Management Limited | Administrative & support | 2025 |
| Keiff's Developments Ltd | Construction | 2018 |
| Kelly Griffin Roofline Limited | Construction | 2018 |
| Kelly Griffin Scaffolding Ltd | Construction | 2016 |
| KEN Mcguinness Construction Ltd | Construction | 2025 |
| Kenlo Ltd | Information & communication | 2004 |
| Kennington Park Leisure Ltd | Hospitality | 2022 |
| Kenny Mammarella-D’Cruz Limited | Other services | 2008 |
| Kensai Properties Limited | Real estate | 2012 |
| Kensington IVY Ltd | Education | 2026 |
| Kent Property Estates Limited | Construction | 2008 |
| KERALA131HEALTH Limited | Other services | 2014 |
| Kernow Holiday Lets Ltd | Real estate | 2024 |
| Kerris Property Limited | Real estate | 2010 |
| Kerschbaumer Ltd | Health & social care | 2022 |
| KES Electrics Services Ltd | Energy | 2017 |
| KEV & Nick Ltd | Construction | 2020 |
| Kevin's Radiography Ltd | Wholesale & retail | 2015 |
| Key Accountancy Limited | Professional & scientific | 2000 |
| Key Choices Services Limited | Administrative & support | 2019 |
| Key Fire Doors Limited | Public administration | 2024 |
| Key Worker Services Limited | Administrative & support | 2020 |
| Keynest Finance Limited | Financial services | 2026 |
| Keynote Property Ltd | Real estate | 2021 |
| Keysland Homes Limited | Construction | 2014 |
| Keystone Brickwork (UK) Ltd | Construction | 2018 |
| Keystone Care Home Ltd | Health & social care | 2025 |
| Keystone Property Investments Ltd | Real estate | 2017 |
| KF and MF Limited | Administrative & support | 2023 |
| Kfwc Ltd | Hospitality | 2018 |
| KG Collectibles Ltd | Wholesale & retail | 2025 |
| KGK Scaffolding Ltd | Construction | 2011 |
| KGL Global Brand Management Limited | Wholesale & retail | 2014 |
| KH Investments Holdings Ltd | Real estate | 2019 |
| KH Landscaping Ltd | Administrative & support | 2026 |
| Khac Ltd | Construction | 2010 |
| Khalsa Property Limited | Real estate | 2022 |
| Khanyisa Ltd | Health & social care | 2026 |
| Kharag Properties Ltd | Real estate | 2021 |
| Khysis Properties Ltd | Real estate | 2023 |
| Kick OFF Management Ltd | Arts & recreation | 2015 |
| KID Kamera Productions Ltd | Information & communication | 2025 |
| Kidsversity Limited | Education | 2021 |
| Kidsversity Tuition Limited | Education | 2021 |
| Kidz Proof Limited | Education | 2022 |
| Kiemar Limited | Real estate | 2017 |
| Kieran Drew Enterprise Ltd | Professional & scientific | 2023 |
| Kilden Services Ltd | Professional & scientific | 2019 |
| Killian Construction Services Ltd | Construction | 2017 |
| Kiln Farm Produce Ltd | Wholesale & retail | 2018 |
| Kimagure Ltd | Information & communication | 2026 |
| Kindaquick Limited | Extraterritorial | 2020 |
| Kindling AI Limited | Information & communication | 2024 |
| Kings Decorators Merchants Ltd | Wholesale & retail | 2020 |
| Kings Dine Ltd | Hospitality | 2024 |
| Kings Farming Ltd | Agriculture & fishing | 2021 |
| Kings Security Group Ltd | Administrative & support | 2023 |
| Kings Veterinary Centre Limited | Professional & scientific | 2024 |
| Kings-Art Ltd | Professional & scientific | 2019 |
| Kingsbrook Group Ltd | Financial services | 2025 |
| Kingston HV Properties Ltd | Real estate | 2019 |
| Kingswood Building Supplies Ltd | Wholesale & retail | 2020 |
| Kingz Foods Ltd | Hospitality | 2025 |
| Kinsman Elevators Limited | Manufacturing | 2020 |
| Kirbyanne Limited | Hospitality | 2020 |
| Kirkuk Limited | Hospitality | 2019 |
| Kistaj Ltd | Hospitality | 2013 |
| Kitaur Aesthetics Ltd | Other services | 2022 |
| Kitchens Renewed Essex Ltd | Wholesale & retail | 2022 |