| Kate Gibbons Ltd | Health & social care | 2023 |
| Kate Ocean Ltd | Real estate | 2021 |
| Katherin Duque Serviced Apartments Limited | Real estate | 2024 |
| Katherine Anne Aesthetics Limited | Other services | 2022 |
| Katie's Lashes Limited | Other services | 2019 |
| Katoma Ltd | Wholesale & retail | 2025 |
| Katsoulidis Dent Ltd | Health & social care | 2018 |
| Katy Pond Consulting Ltd | Administrative & support | 2025 |
| Kavi Investments Limited | Real estate | 2019 |
| Kavu Ltd | Construction | 2017 |
| Kayak Solutions Ltd | Manufacturing | 2025 |
| Kayan Consulting Ltd | Professional & scientific | 2025 |
| Kayani Foods Limited | Hospitality | 2021 |
| Kayrayconnect Ltd | Real estate | 2017 |
| KB Global Entertainment Ltd | Arts & recreation | 2022 |
| KB1 Ltd | Construction | 2024 |
| KBM Assets Limited | Real estate | 2025 |
| KBM Practice Limited | Health & social care | 2014 |
| KBY Property Ltd | Real estate | 2025 |
| KC Fencing Limited | Administrative & support | 2019 |
| KCC Holdings Ltd | Financial services | 2020 |
| KCD Elite Ltd | Wholesale & retail | 2024 |
| KCW Rail Ltd | Other services | 2016 |
| KD ERP Consulting Ltd | Information & communication | 2024 |
| KD Homecare Ltd | Other services | 2019 |
| KDJ Carpentry and Construction Limited | Manufacturing | 2021 |
| Keats Building Limited | Construction | 2016 |
| Keen Graphic Design Ltd | Professional & scientific | 2024 |
| Keenan Groundworks Limited | Construction | 2016 |
| Keiper UK Limited | Professional & scientific | 1982 |
| Keir Ecoms Limited | Wholesale & retail | 2023 |
| Kells Kitchen Catering Limited | Hospitality | 2025 |
| Kemetrix Limited | Information & communication | 2025 |
| Kemofpay Limited | Financial services | 2024 |
| Kendall Brothers Golf Ltd | Wholesale & retail | 2022 |
| Kendricks Asset Management Ltd | Professional & scientific | 2025 |
| Kenn Scaddan Associates Limited | Professional & scientific | 2020 |
| Kennett Carpentry Limited | Construction | 2007 |
| Kens Waterlooville Limited | Hospitality | 2015 |
| Keoghane - Urology Limited | Health & social care | 2014 |
| Keohane Dermatology Limited | Health & social care | 2013 |
| Kevlar : G E Solutions Ltd | Construction | 2025 |
| Kevlar Electrical Ltd | Construction | 2023 |
| KEW Homes & Gardens Limited | Wholesale & retail | 2026 |
| Key Innovation Consultants Ltd | Professional & scientific | 2025 |
| Key-Ms Limited | Other services | 2014 |
| KEY2 Group (Holdings) Limited | Professional & scientific | 2006 |
| Keybuild Contracts Ltd | Construction | 2026 |
| Keys Electrical Ltd | Construction | 2011 |
| Keyzzer Limited | Hospitality | 2025 |
| Kezia Mariella Ltd | Transport & logistics | 2024 |
| KF Fire Protection Ltd | Construction | 2017 |
| Kfhengineering Ltd | Professional & scientific | 2014 |
| KG Acquisitions Ltd | Real estate | 2026 |
| KGH Automotive Ltd | Wholesale & retail | 2025 |
| KH Real Estate Holdings Limited | Real estate | 2024 |
| Khaalis Clothing Limited | Wholesale & retail | 2025 |
| KHL Consulting Ltd | Professional & scientific | 2023 |
| KI18ONE Ltd | Real estate | 2018 |
| Killick Construction Limited | Construction | 2018 |
| Kilmeston Consulting Limited | Professional & scientific | 2009 |
| Kimochi Investments Limited | Real estate | 2025 |
| Kimson Group Ltd | Financial services | 2020 |
| Kingdom Home Improvements Limited | Construction | 2007 |
| Kingfisher Education Group Limited | Education | 2023 |
| Kingfisher Properties Southern Ltd | Construction | 2024 |
| Kingsbury Court (Clanfield) Road Maintenance Ltd | Construction | 2024 |
| Kingsgate Roofing Ltd | Construction | 2026 |
| Kingsland Painting Contractors Limited | Construction | 2018 |
| Kingsmead Medical Services Ltd | Other services | 2022 |
| Kingsmere Civils Ltd | Construction | 2024 |
| Kingsmere Group Limited | Construction | 2024 |
| Kingsmere Rail Ltd | Transport & logistics | 2018 |
| Kingston Domestic Appliances Ltd | Other services | 2017 |
| Kingswell Kitchens and Bedrooms Chichester Ltd | Wholesale & retail | 2024 |
| Kirkbridge Properties Limited | Construction | 1999 |
| Kirke London Ltd | Wholesale & retail | 2023 |
| Kirsty Bailey Consultancy Limited | Hospitality | 2013 |
| Kirsty Rose Consultancy Ltd | Health & social care | 2025 |
| Kismet Kebab Horndean Ltd | Hospitality | 2026 |
| Kitchen Door Guru Limited | Wholesale & retail | 2022 |
| Kitform Limited | Extraterritorial | 2011 |
| Kitnocks Specialist Care Limited | Health & social care | 2012 |
| Kiwi Bird Studios Ltd | Information & communication | 2025 |
| Kiza Holdings Limited | Real estate | 2025 |
| KJB Distribution Ltd | Wholesale & retail | 2026 |
| KJP Consulting Ltd | Administrative & support | 2024 |
| Klass Education Services Ltd | Education | 2026 |
| Klassy Kats Limited | Wholesale & retail | 2024 |
| Klaszee Stylz Limited | Wholesale & retail | 2024 |
| Klean & Tidy Services Ltd | Administrative & support | 2018 |
| KLG Associates Limited | Administrative & support | 2015 |
| KLP Civil Engineering Ltd | Construction | 2025 |
| KLT Window Solutions Ltd | Construction | 2024 |
| KLW Legal Limited | Other services | 2025 |
| KM2 Property Investments Ltd | Real estate | 2025 |
| KMC. FOX Limited | Construction | 2024 |
| Knight Finance Ltd | Professional & scientific | 2024 |
| Knightsbridge Investment Property Limited | Real estate | 1999 |
| Knoesis Technologies Limited | Information & communication | 2024 |