| Kamos Vehicle Logistics Limited | Wholesale & retail | 2020 |
| Kanapbo | Professional & scientific | 2023 |
| Karas PRM Ltd | Professional & scientific | 2015 |
| Karen LEE PUB Co Ltd | Hospitality | 2025 |
| Karenoch Enterprise Limited | Administrative & support | 2025 |
| Kareplan Medicare Ltd | Health & social care | 2023 |
| Karma Kids Ltd | Arts & recreation | 2024 |
| Karsli Ltd | Health & social care | 2026 |
| Karve Clothing UK Ltd | Wholesale & retail | 2021 |
| Kathmark Building Contractors Ltd | Extraterritorial | 2021 |
| Kavs Electrical Solutions Ltd | Construction | 2026 |
| KAY Collins Lettings Limited | Real estate | 2015 |
| KAY Collins Sales, Lettings & Property Management Ltd | Real estate | 2009 |
| KAY Design Limited | Other services | 2021 |
| Kaylex Developments Ltd | Real estate | 2022 |
| Kaypoku Limited | Health & social care | 2020 |
| KAZ Mini Market Limited | Wholesale & retail | 2024 |
| KAZ Mini Market Store Ltd | Wholesale & retail | 2026 |
| KB Concept Cuisine Ltd | Professional & scientific | 2026 |
| KB Environmental Consulting Limited | Professional & scientific | 2022 |
| KB Fashion LAB Ltd | Wholesale & retail | 2023 |
| KBL Domestic Services Ltd | Transport & logistics | 2024 |
| KBW Group RD Ltd | Construction | 2025 |
| KBZ Medico Ltd | Health & social care | 2026 |
| KCC Vehicle Sales Ltd | Wholesale & retail | 2025 |
| KD Cooling Ltd | Professional & scientific | 2025 |
| KD Office Services Limited | Administrative & support | 2017 |
| KD Properties North West Ltd | Real estate | 2025 |
| KDA Contracts Ltd | Administrative & support | 2009 |
| KDM Electrical Limited | Construction | 2018 |
| Kdub Limited | Construction | 2026 |
| Keal Joinery Limited | Construction | 2020 |
| Keam Solutions Ltd | Professional & scientific | 2026 |
| Keating Property Ltd | Real estate | 2025 |
| Keeffe and Associates Limited | Professional & scientific | 2021 |
| Keeley Healthcare Limited | Public administration | 2025 |
| Keen's Brickwork Construction Limited | Construction | 2022 |
| Keep Britain Tidy | Professional & scientific | 1998 |
| Keep England Tidy Limited | Administrative & support | 2023 |
| Keep-Net Solutions Limited | Construction | 2021 |
| Keianthom Ltd | Health & social care | 2026 |
| Keith Jones Interpreting Ltd | Administrative & support | 2008 |
| Kelly Bennett Limited | Real estate | 2017 |
| Kelly Konsult Ltd | Professional & scientific | 2022 |
| Kelly Structures Limited | Professional & scientific | 2021 |
| Kelogrande | Professional & scientific | 2023 |
| Kelrick Properties Limited | Real estate | 2005 |
| Kendah Energy Limited | Wholesale & retail | 2025 |
| Kendal Property Holdings Limited | Real estate | 2016 |
| Kendes Ltd | Transport & logistics | 2026 |
| Keneck Ltd | Information & communication | 2025 |
| Kenmar Motor Company Ltd | Wholesale & retail | 2025 |
| Kennedy Palma Concrete Pumping Ltd | Construction | 2009 |
| Kenny Lettings Ltd | Real estate | 2024 |
| Kentaiido Investment Ltd | Wholesale & retail | 2026 |
| Kenwood Homes Limited | Real estate | 1985 |
| Kenyon Court Properties Limited | Construction | 2002 |
| Kerala Cart Ltd | Wholesale & retail | 2025 |
| Kerberos Ventures Ltd | Financial services | 2020 |
| Kernow Financial Ltd | Financial services | 2017 |
| Kerry a Harrison Limited | Information & communication | 2007 |
| Kerry Tanfield Consulting Limited | Professional & scientific | 2009 |
| KEV Brown Limited | Arts & recreation | 2019 |
| KEV Phelan Elec Ltd | Construction | 2020 |
| KEV Thomas Ltd | Construction | 2026 |
| Kevin M Nestor Limited | Construction | 2023 |
| Key Electrical Limited | Manufacturing | 2003 |
| Keygence Limited | Information & communication | 2025 |
| Keystone Properties (UK) Limited | Real estate | 2005 |
| KGE GAS Services Ltd | Construction | 2026 |
| KGL Properties Limited | Real estate | 2009 |
| KGM Trading Limited | Construction | 2017 |
| Khan Hindley Ltd | Hospitality | 2025 |
| Khan Logistics Limited | Transport & logistics | 2016 |
| Khanx Logistics Ltd | Transport & logistics | 2025 |
| Khanyi Cooking Systems Limited | Wholesale & retail | 2017 |
| Khaotic Carping Ltd | Wholesale & retail | 2025 |
| KHD Hire Ltd | Administrative & support | 2026 |
| KHD Hydraulics Ltd | Construction | 2024 |
| Kheer Thar Enterprise Limited | Wholesale & retail | 2024 |
| Khepri Technologies Ltd | Information & communication | 2025 |
| Ki-Rigg Ltd | Information & communication | 2018 |
| Kiajna Ltd | Transport & logistics | 2020 |
| Kian Developments Limited | Real estate | 2020 |
| Kids Kloset Limited | Wholesale & retail | 2013 |
| Kids Utopia Limited | Health & social care | 2020 |
| Kidur Media Ltd | Professional & scientific | 2022 |
| Kidz Ltd | Arts & recreation | 2025 |
| Kidz Pamper BUS Ltd | Arts & recreation | 2023 |
| KIE Marketing Limited | Information & communication | 2026 |
| Kieltra Ltd | Information & communication | 2025 |
| Kieran J Commercial Ltd | Real estate | 2024 |
| Kieran Jones Plastering Limited | Construction | 2024 |
| Kiki Desserts Ltd | Wholesale & retail | 2024 |
| Kilabitzzz Ltd | Manufacturing | 2012 |
| Kilcoyne's Bar Limited | Hospitality | 2023 |
| Kilhey Consultancy Limited | Construction | 2019 |
| KIM Swift Science Education Consultancy Ltd | Education | 2021 |
| Kincade Investments Ltd | Real estate | 2024 |
| Kinderstart Ltd | Professional & scientific | 2026 |