| KAH Drilling Services Ltd | Administrative & support | 2023 |
| Kahoon Media Ltd | Information & communication | 2012 |
| Kaiju Medical Communications Ltd | Administrative & support | 2025 |
| Kaizen Global Group Ltd | Administrative & support | 2021 |
| Kaizen Impact Coaching LLP | | 2023 |
| Kaizen Warrington Limited | Hospitality | 2022 |
| KAJ Inspection Services Limited | Professional & scientific | 2017 |
| Kaley Group Limited | Wholesale & retail | 2025 |
| Kalgarth Grange Nursery School Ltd | Education | 2004 |
| Kalidus IT Services Ltd | Information & communication | 2023 |
| Kalincon Limited | Administrative & support | 2024 |
| Kallahtech Building Surveying Consultants Ltd | Administrative & support | 2026 |
| Kalmark Limited | Hospitality | 1990 |
| Kalos HV Services Ltd | Administrative & support | 2026 |
| Kalos IT Solutions Ltd | Information & communication | 2024 |
| Kalpesh Mehta Limited | Administrative & support | 2024 |
| Kalson Properties Ltd | Real estate | 2024 |
| Kalucci Limited | Other services | 2017 |
| Kaluna Studio Ltd | Other services | 2024 |
| Kamak Engines Limited | Professional & scientific | 2015 |
| Kamalandshelley Limited | Information & communication | 2023 |
| Kameo Konsulting Limited | Administrative & support | 2015 |
| Kami Fast Food Ltd | Hospitality | 2024 |
| Kamjet Ltd | Transport & logistics | 2019 |
| Kamran Teta Ltd | Administrative & support | 2025 |
| Kamroc Limited | Information & communication | 2014 |
| Kandake Resourcing Limited | Administrative & support | 2013 |
| Kandooma Consulting Limited | Information & communication | 2011 |
| Kanetkar Consultants Limited | Administrative & support | 2013 |
| Kang Travel Ltd | Administrative & support | 2020 |
| Kanhamay Consultancy Limited | Administrative & support | 2025 |
| Kannathu Kalam Consulting Ltd | Information & communication | 2014 |
| Kans Software Limited | Information & communication | 2010 |
| Kantinet Limited | Administrative & support | 2018 |
| Kapari Trading Ltd | Wholesale & retail | 2024 |
| Kappa Beta Limited | Administrative & support | 2013 |
| KAR Consulting Ltd | Information & communication | 2024 |
| Kara Bennett Ltd | Professional & scientific | 2025 |
| Karadag Consulting Ltd | Transport & logistics | 2020 |
| Karakoram Island Ltd | Information & communication | 2013 |
| Karich Consulting Limited | Information & communication | 2011 |
| Karim Construct Limited | Construction | 2026 |
| Karkinosmegaresources Ltd | Public administration | 2021 |
| Karl Wood Solutions Limited | Professional & scientific | 2016 |
| Karlo Dog Limited | Agriculture & fishing | 2025 |
| Karol Idung Homes Ltd | Real estate | 2026 |
| Karolina Diamond BS Ltd | Other services | 2019 |
| Karolina J Property Limited | Real estate | 2019 |
| Karonda Marine Consultancy Ltd | Administrative & support | 2026 |
| Karrass BIM Services Limited | Professional & scientific | 2016 |
| Karterco Developments Ltd | Real estate | 2021 |
| Karyn Long Limited | Administrative & support | 2011 |
| Kasb Services Ltd | Construction | 2023 |
| Kasbri Limited | Arts & recreation | 2016 |
| Kasch Projects Ltd | Professional & scientific | 2019 |
| Kase Limited | Professional & scientific | 2020 |
| Kastsoft Limited | Information & communication | 2018 |
| Katalyzt Properties Ltd | Real estate | 2020 |
| Kate Anthony Hair Limited | Other services | 2015 |
| Kate Trafford Consulting Ltd | Professional & scientific | 2002 |
| Kathro Consultancy Limited | Administrative & support | 2013 |
| Kathrose Limited | Administrative & support | 2019 |
| KAV Electrical Ltd | Construction | 2026 |
| KAW Solutions Ltd | Administrative & support | 2022 |
| Kawasaki Robotics (UK) Limited | Professional & scientific | 1996 |
| KAY Construction Services Ltd | Administrative & support | 2016 |
| KAY Management and Consultancy Limited | Professional & scientific | 2016 |
| KAY Smiles Limited | Health & social care | 2024 |
| Kayleigh Louise Hair & Beauty Salon Limited | Other services | 2016 |
| Kayleigh Louise Holdings Limited | Professional & scientific | 2026 |
| Kays Properties Ltd | Real estate | 2019 |
| Kaysubsea Ltd | Wholesale & retail | 2017 |
| Kayz Consult Limited | Health & social care | 2024 |
| KAZ and CAI Limited | Hospitality | 2023 |
| Kazio Limited | Transport & logistics | 2016 |
| KB Beauty & Spmu Ltd | Other services | 2021 |
| KB Business Ltd | Professional & scientific | 2023 |
| KBA Trustees Limited | Professional & scientific | 2026 |
| KBC Brothers Limited | Hospitality | 2020 |
| KBC Cleaning Services Ltd | Administrative & support | 2025 |
| KBG Property Ltd | Real estate | 2025 |
| Kbis Consulting Ltd | Professional & scientific | 2018 |
| Kbranch Properties Ltd | Real estate | 2022 |
| Kbranch Solutions Limited | Other services | 2018 |
| KC Garage Limited | Wholesale & retail | 2025 |
| KC Maintenance Ltd | Professional & scientific | 2024 |
| KC Mechanical Ltd | Construction | 2024 |
| KC Orthopaedics Limited | Health & social care | 2019 |
| KC Plant OP Limited | Other services | 2018 |
| KC Send Consultancy Ltd | Professional & scientific | 2026 |
| KCA Services Ltd | Other services | 2017 |
| KCC Project Solutions Limited | Administrative & support | 2013 |
| Kccm Limited | | 2014 |
| KCG Construction Limited | Construction | 2013 |
| KCH Auto Repairs Limited | Wholesale & retail | 2023 |
| KD Fulfilment Solutions Limited | Wholesale & retail | 2025 |
| KD Jones Network Automation Consultancy Ltd | Administrative & support | 2024 |
| KD Services NW Limited | Transport & logistics | 2011 |
| KDD Fitness Ltd | Health & social care | 2024 |
| Kdei Limited | Information & communication | 2017 |