| KH Aesthetics Ltd | Health & social care | 2026 |
| Khamthai Ltd. | Financial services | 2021 |
| Khedun LLP | | 2020 |
| Kickstart Solutions Limited | Professional & scientific | 2006 |
| Kiely Planning Limited | Professional & scientific | 2012 |
| Kiffgo Ltd | Information & communication | 2017 |
| Kiki Care Ltd | Wholesale & retail | 2021 |
| Kiko Enterprises Ltd | Transport & logistics | 2019 |
| Kilbride BIO Sciences Limited | Professional & scientific | 2019 |
| Kilbride Biotech Group Limited | Other services | 2017 |
| Kilbride Biotek Limited | Other services | 2017 |
| Kilbride Data Centres Limited | Construction | 2025 |
| Kilbride GX Limited | Construction | 2024 |
| Killynether Investments | Professional & scientific | 2022 |
| KIN House Operations Ltd | Hospitality | 2022 |
| Kinesis Clinic Limited | Health & social care | 2023 |
| Kingdom Building 633 Limited | Construction | 2025 |
| Kingfield Investments Ltd | Administrative & support | 2001 |
| Kingfisher Builds Limited | Construction | 2024 |
| Kingfisher Cars Limited | Wholesale & retail | 2014 |
| Kingfisher School Limited | Education | 2024 |
| Kingmaker Services Limited | Arts & recreation | 2001 |
| Kings Capital Limited | Professional & scientific | 2013 |
| Kingsdown Property Company Limited | Real estate | 1951 |
| Kingsdowne House (Meadrow) Residents Management Company Limited | Households | 2007 |
| Kingsfield (EOT) Limited | Administrative & support | 2021 |
| Kingsfield Academy International Limited | Professional & scientific | 1997 |
| Kingshott Carpentry Limited | Construction | 2019 |
| Kingsland Estates (GP) Limited | Real estate | 1961 |
| Kingsland Estates Limited | Real estate | 1998 |
| Kingswolf-Yamakawa Ltd. | Information & communication | 2025 |
| Kinlan Dynamics Ltd | Professional & scientific | 2021 |
| Kinnetix Ltd | Other services | 2025 |
| Kirkwhelpington Management Company Ltd | Real estate | 2021 |
| Kiro Kiro Limited | Wholesale & retail | 2024 |
| Kismet Ventures Ltd | Extraterritorial | 2021 |
| Kiss Cleaning Ltd | Administrative & support | 2019 |
| Kiss Decorating & Property Maintenance Ltd | Construction | 2018 |
| Kitchenpod Ltd | Administrative & support | 2015 |
| Kitt Consultancy Limited | Professional & scientific | 2024 |
| KJ Thompson Ltd | Other services | 2024 |
| KJB Surveying Ltd | Professional & scientific | 2026 |
| KJP Gems Limited | Professional & scientific | 2025 |
| Kkmc Services Limited | Real estate | 2014 |
| KLC Advisory Services Limited | Professional & scientific | 1997 |
| Kliative Ltd | Information & communication | 2023 |
| Kloudwerk Limited | Information & communication | 2020 |
| KM Corp Ltd | Wholesale & retail | 2018 |
| KMA Cars Ltd | Transport & logistics | 2020 |
| KMC Technical Ltd | Professional & scientific | 2019 |
| KMG International Limited | Administrative & support | 1986 |
| KMN Construction Consultants Ltd | Construction | 2014 |
| Kmotion Interactive Limited | Information & communication | 2009 |
| KMY Estate Ltd | Real estate | 2025 |
| Kmyr Ltd | Information & communication | 2019 |
| Knight Services Ltd | Real estate | 2018 |
| Knightmaster Developments Ltd | Construction | 2018 |
| Knightmaster Investments Ltd | Real estate | 2018 |
| Knights Agency Ltd | Education | 2011 |
| Knights of Engineering Ltd | Mining & quarrying | 2017 |
| Knights Recovery & Transport Ltd | Transport & logistics | 2020 |
| KNN Family Holdings Ltd | Financial services | 2025 |
| Knottfield Ltd | Professional & scientific | 2020 |
| Know Fire Limited | Professional & scientific | 2005 |
| Know My Health Ltd | Information & communication | 2025 |
| Knowledge Mentoring (Global) Limited | Information & communication | 2019 |
| Kobborg Consult - Leads Ltd | Professional & scientific | 2020 |
| Kobborg Consult Limited | Professional & scientific | 2003 |
| Koet Consultancy Limited | Administrative & support | 2017 |
| Kofana Digital Limited | Information & communication | 2017 |
| Kombi Constructions Ltd | Construction | 2021 |
| Kommercialize Ltd | Other services | 2012 |
| Konnection Services Limited | Construction | 2020 |
| Kono Arms Ltd | Wholesale & retail | 2022 |
| Koodos Directors Limited | Professional & scientific | 2025 |
| Koodos LV Limited | Financial services | 2025 |
| Koodos Precision APS SPV Limited | Professional & scientific | 2025 |
| Koodos Trustees Limited | Professional & scientific | 2026 |
| Koot Auto Ltd | Wholesale & retail | 2026 |
| Kopi Concepts Ltd | Professional & scientific | 2021 |
| Koru Health and Fitness Limited | Arts & recreation | 2019 |
| Koto Interim Ltd | Professional & scientific | 2020 |
| Kouwa Catering Group Ltd | Hospitality | 2025 |
| Kowalski Delicatessen Ltd | Wholesale & retail | 2011 |
| Koyo Finance 1 Ltd | Financial services | 2021 |
| KP Heating Limited | Construction | 2021 |
| KP Multi Tradesman Ltd | Construction | 2024 |
| KP Sport UK Ltd | Wholesale & retail | 2022 |
| Kp's Krackers Ltd | Wholesale & retail | 2025 |
| KPP Consultancy Ltd | Professional & scientific | 2011 |
| KPS1923 Ltd | Financial services | 2022 |
| Kraken Capital Limited | Professional & scientific | 2018 |
| Krazy Style Limited | Wholesale & retail | 2025 |
| Kreame Ltd | Wholesale & retail | 2024 |
| Krema Limited | Hospitality | 2015 |
| Krenchie Limited | Real estate | 2020 |
| Kribbage Limited | Wholesale & retail | 2017 |
| Krishmjproperties Limited | Real estate | 2021 |
| Krishna Inc Ltd | Real estate | 2025 |
| Kronos Labs Ltd | Information & communication | 2026 |