| Kahlon Brothers Construction Limited | Construction | 2025 |
| Kakim Recruitment Ltd | Administrative & support | 2024 |
| Kaleidoscope Nursery Limited | Education | 2007 |
| Kalika Cabs Ltd | Transport & logistics | 2025 |
| Kall Services (Midlands) Ltd | Water & waste | 2012 |
| Kalma Developments Limited | Construction | 2012 |
| Kalma Foods Limited | Wholesale & retail | 2009 |
| Kamal Art 2425 Limited | Wholesale & retail | 2025 |
| Kamaro Supply and Fitting Ltd | Construction | 2015 |
| Kamx Limited | Health & social care | 2025 |
| Kandon Technologies Limited | Financial services | 2020 |
| Kandy Homes Limited | Real estate | 2022 |
| Kannan Property Ltd | Real estate | 2024 |
| Kaos Designs Ltd | Wholesale & retail | 2024 |
| Kapr Properties Ltd | Real estate | 2017 |
| Karim MED Ltd | Health & social care | 2025 |
| Karl Dungs Limited | Manufacturing | 1987 |
| KAS CAB Ltd | Transport & logistics | 2023 |
| KAS Eurotrading Limited | Wholesale & retail | 2024 |
| Kasiho Ltd | Construction | 2016 |
| Kastello Builders Limited | Real estate | 2019 |
| Kastello Group Ltd | Real estate | 2021 |
| KAT and NAT Ltd | Hospitality | 2024 |
| Kate Sproston Design Ltd. | Manufacturing | 2012 |
| Kate’S Apparel Ltd | Wholesale & retail | 2025 |
| Katira Management Limited | Information & communication | 2022 |
| Kavita (UK) Limited | Hospitality | 2008 |
| KB Awnings Limited | Administrative & support | 2022 |
| KB Clerk of Works Limited | Construction | 2023 |
| KB Lucas Construction Ltd | Construction | 2021 |
| KB Transport Solutions Limited | Transport & logistics | 2011 |
| KB Trunking Services Limited | Transport & logistics | 2021 |
| KBM Associates Ltd | Information & communication | 2021 |
| Kbpb LLP | | 2026 |
| KBS Holdings Limited | Financial services | 2015 |
| KC Construction and Groundworks Limited | Other services | 2017 |
| KCJ Hospitality Limited | Hospitality | 2022 |
| KDC Transport Limited | Administrative & support | 2019 |
| Kearney Group U.K. Ltd | Transport & logistics | 2022 |
| Kearns Projects Limited | Other services | 2014 |
| Kebi Group Ltd | Wholesale & retail | 2025 |
| Keechi and Co Ltd | Wholesale & retail | 2025 |
| Keepabuk Limited | Administrative & support | 2018 |
| Keeping UP Appearances Ltd | Administrative & support | 2003 |
| KEG Contracts Ltd | Administrative & support | 2019 |
| Kehq Ltd | Real estate | 2026 |
| Kellport Limited | Financial services | 2009 |
| Kendell’S Katering Services Ltd | Hospitality | 2024 |
| Kennedy Management Solutions Ltd | Administrative & support | 2025 |
| Kent MAN and Van Removals Ltd | Other services | 2019 |
| KEO Construction Limited | Construction | 2010 |
| KER Property Ltd | Real estate | 2023 |
| Kerry Arnold Ltd | Wholesale & retail | 2016 |
| Kevin Bishop Limited | Extraterritorial | 2017 |
| Key Communication Services Limited | Administrative & support | 1993 |
| Key Estate Agents (the Green) Limited | Real estate | 2002 |
| Key Financial Services (Midlands) Limited | Financial services | 2001 |
| Key Property Services (the Green) Ltd | Real estate | 2003 |
| Keysecure Safety Equipment Ltd | Construction | 2003 |
| Keysecure Safety Limited | Construction | 2025 |
| KG Temporary Limited | Transport & logistics | 2018 |
| Khair Travel & Tours Ltd | Administrative & support | 2025 |
| Khalsaroute Logistics Ltd | Transport & logistics | 2025 |
| Khan JNM Ltd | Wholesale & retail | 2026 |
| Khorasan-Uk- Ltd | Wholesale & retail | 2023 |
| Kickin Kampers Limited | Wholesale & retail | 2015 |
| Kilowattz Limited | Construction | 2026 |
| Kinderspeed Ltd | Transport & logistics | 2025 |
| Kinetic Power Systems Limited | Manufacturing | 2020 |
| Kineticbridge Ltd | Health & social care | 2025 |
| King & King Property Ltd | Construction | 2022 |
| King Fleet Engineer Ltd | Administrative & support | 2024 |
| Kingswood Fish & Chips Ltd | Hospitality | 2025 |
| Kirby Pro-Seal Limited | Extraterritorial | 2016 |
| Kirby Sebastian Investment Ltd | Extraterritorial | 2013 |
| Kirkbride Holdings Group Limited | Financial services | 2025 |
| Kiros Intellectual Property Consultancy Limited | Professional & scientific | 2009 |
| Kirwan Consultancy Limited | Health & social care | 2023 |
| Kitchens World Ltd | Manufacturing | 2019 |
| KIZ Property Ltd | Real estate | 2020 |
| KJC Construction Limited | Construction | 2014 |
| KJL Installations Ltd | Construction | 2019 |
| KK Brickwork Ltd | Construction | 2024 |
| Klausenburg Limited | Transport & logistics | 2016 |
| Klrh White Hart Ltd | Hospitality | 2023 |
| KLS Groundcare Machinery Limited | Manufacturing | 2017 |
| KLS Healthcare Limited | Health & social care | 2022 |
| Kludge Cyber Systems Ltd. | Manufacturing | 2025 |
| KM Invest Group Ltd | Wholesale & retail | 2021 |
| KML Health Limited | Information & communication | 2014 |
| Kmlinney Properties Limited | Real estate | 2024 |
| Kmmh Limited | Manufacturing | 2022 |
| Kmsd Enterprises Ltd | Wholesale & retail | 2025 |
| Kmsd Holdings Ltd | Financial services | 2025 |
| KN National Relocation Ltd | Hospitality | 2024 |
| KN Prime Rentals Ltd | Real estate | 2024 |
| KNA Partners Limited | Real estate | 2025 |
| Knight Management Solutions Ltd | Real estate | 2023 |
| Knots & Mates Ltd | Wholesale & retail | 2025 |
| Knowledge Based Training Ltd | Education | 2025 |