| Kelvin Francis Ltd | Real estate | 2003 |
| Kelvs Food Ltd | Wholesale & retail | 2025 |
| Kelynch Ltd | Hospitality | 2016 |
| Kelyon Ltd | Information & communication | 2017 |
| Kelzo Jewellery Limited | Wholesale & retail | 2024 |
| KEM Holdings Ltd | Real estate | 2020 |
| Kemal Duhan Bodur Ltd | Wholesale & retail | 2025 |
| Kemav Limited | Information & communication | 2015 |
| Kemit Center for International Arbitration (DR. Fathy Sorour) Ltd | Financial services | 2025 |
| KEN Bowden (Cardiff) Ltd | Professional & scientific | 2013 |
| KEN Picton Salons Ltd | Other services | 2010 |
| KEN Technologies Ltd | Information & communication | 2019 |
| Kenada Limited | Wholesale & retail | 2023 |
| Kenbro Smile Ltd | Health & social care | 2026 |
| Kendon Tech Ltd | Financial services | 2018 |
| Kenect HR Services 1 Ltd | Administrative & support | 2025 |
| Kenect HR Services Ltd | Administrative & support | 2021 |
| Kenect Services Ltd | Wholesale & retail | 2021 |
| Kenizo Ltd | Wholesale & retail | 2025 |
| Kenjack Capital Limited | Administrative & support | 2015 |
| Kenley Foods Ltd | Hospitality | 2025 |
| Kenmare Europe Limited | Financial services | 2017 |
| Kennedy Property Investments Ltd | Real estate | 2014 |
| Kennedy Sports Associates Limited | Arts & recreation | 2010 |
| Kennedy Ventures Ltd | Professional & scientific | 2025 |
| Kennedys Antiques Ltd | Wholesale & retail | 2025 |
| Kenneth Bernard Cleaning Ltd | Administrative & support | 2024 |
| Kenneth Limited | Wholesale & retail | 2025 |
| Kennie Cooks Ltd | Hospitality | 2025 |
| Kennson Ltd | Real estate | 1982 |
| Kenny Education Services Limited | Education | 2014 |
| Kenoak Limited | | 1989 |
| Kenplaid Ltd | Extraterritorial | 2008 |
| Kensington & Vale Ltd | Real estate | 2025 |
| Kensington and Chelsea Electrical Ltd | Construction | 2018 |
| Kensington Business Services Limited | Administrative & support | 2020 |
| Kensington Court Clinic Limited | Professional & scientific | 2009 |
| Kensington Football Club Ltd | Education | 2018 |
| Kensington House Management (Pembrokeshire) Limited | Real estate | 2006 |
| Kensington Plant Services Ltd | Wholesale & retail | 2018 |
| Kent and Sussex Paving Limited | Construction | 2018 |
| Kent Auto Exchange Limited | Wholesale & retail | 2024 |
| Kent Cafe Ltd | Hospitality | 2015 |
| Kent Electrical Contractors Ltd | Construction | 2024 |
| Kent EYE Health Limited | Health & social care | 2025 |
| Kent Fire Consultants Management Ltd | Public administration | 2020 |
| Kent FOX Real Estate Ltd | Real estate | 1999 |
| Kent Movements Ltd | Water & waste | 2021 |
| Kentaurus Development Ltd | Information & communication | 2025 |
| Kentech Groups Ltd | Information & communication | 2024 |
| Kentgrove Limited | Professional & scientific | 1997 |
| Kentmechanicstyres Ltd | Wholesale & retail | 2024 |
| Kenton Black Finance Limited | Administrative & support | 2021 |
| Kenton Black Group Limited | Administrative & support | 2018 |
| Kenton Black International Limited | Administrative & support | 2021 |
| Kenton Black Limited | Administrative & support | 2008 |
| Kenton Black Northern Limited | Administrative & support | 2021 |
| Kenton Black SC Limited | Administrative & support | 2021 |
| Kenton Black Science & Engineering Limited | Administrative & support | 2021 |
| Kentra Holdings Ltd | Information & communication | 2025 |
| Kenyans Communities Chairpersons Committee Ltd | Education | 2024 |
| Kenyon Construction Limited | Construction | 1984 |
| Kenzo IT Ltd | Information & communication | 2018 |
| Kepai Technology Group Limited | Extraterritorial | 2016 |
| Kerai Property Searches Limited | Administrative & support | 2018 |
| Keralacafe Ltd | Hospitality | 2024 |
| Kerb King 24/7 Ltd | Other services | 2010 |
| Kercom Ltd | Wholesale & retail | 2026 |
| Kerfuffle Free Ltd | Arts & recreation | 2017 |
| Keris Louise Fitness Ltd | Arts & recreation | 2020 |
| Kern Capital Limited | Administrative & support | 2021 |
| Kerner Kapital Limited | Financial services | 2021 |
| Kernick Consultancy Limited | Professional & scientific | 2024 |
| Kernow Electric & Solar Limited | Construction | 2021 |
| Kernow Properties Ltd | Real estate | 2023 |
| Kerry Jane Interiors Ltd | Professional & scientific | 2002 |
| Kerryb Limited | Information & communication | 2017 |
| Kerrys Krazy Kostumes Ltd | Wholesale & retail | 2019 |
| Kersynapse Ltd | Professional & scientific | 2023 |
| Kerwood Medical UK Limited | Wholesale & retail | 2012 |
| KES One Consulting Limited | Health & social care | 2011 |
| Kesabeni Intelligent Technology Co., Ltd. | Extraterritorial | 2021 |
| Kession Capital Limited | Financial services | 2012 |
| Kestral Construction Cardiff Ltd | Construction | 2023 |
| Kestral Construction Limited | Construction | 2013 |
| Kestral Mews Management Limited | Households | 2025 |
| Kestrel Cleaning Limited | Administrative & support | 2023 |
| Keswick Capital Limited | Real estate | 2018 |
| KET KET Digital Ltd | Wholesale & retail | 2024 |
| Ketchell Medical Limited | Health & social care | 2009 |
| Ketnipz Ltd | Information & communication | 2025 |
| Ketreno Services Ltd | Administrative & support | 2024 |
| Kettle and Kettle Enterprises Limited | Education | 2019 |
| Kettle Collection Ltd | Wholesale & retail | 2021 |
| KEV Foley Consulting Ltd | Professional & scientific | 2026 |
| KEV Restaurant Ltd | Hospitality | 2019 |
| Kev-Uk Ltd | Wholesale & retail | 2026 |
| Kevb Consultancy Limited | Information & communication | 2019 |
| Kevin Cahill Limited | Transport & logistics | 2004 |
| Kevin Construction Solutions Limited | Construction | 2026 |