| KKX Ltd | Health & social care | 2011 |
| KL Alloys Ltd | Wholesale & retail | 2026 |
| KL Management Consultants Limited | Professional & scientific | 2007 |
| KL Operational Solutions Limited | Professional & scientific | 2015 |
| KL Transportadora Ltd | Extraterritorial | 2025 |
| Klarintel Limited | Information & communication | 2025 |
| Klarity Tax Limited | Professional & scientific | 2016 |
| Klarity Vision Limited | Administrative & support | 2011 |
| Klaud Limited | Administrative & support | 2024 |
| Klaxon AI Limited | Manufacturing | 2023 |
| Kleanpro Ltd | Wholesale & retail | 2023 |
| Kleintax Ltd | Professional & scientific | 2017 |
| Klemich Consulting Ltd | Other services | 2019 |
| KLF Mortgages Ltd | Financial services | 2024 |
| KLG HRC Ltd | Professional & scientific | 2025 |
| KLG Investments Ltd | Real estate | 2025 |
| Klim Singh Electrical Services Ltd | Construction | 2020 |
| Klim Singh Investments Ltd | Real estate | 2020 |
| Klimek Ltd | Transport & logistics | 2019 |
| Klip Developments Limited | Construction | 2019 |
| Kliq Change Ltd | Other services | 2011 |
| KLM Heating Ltd | Construction | 2014 |
| Kloak Ltd | Information & communication | 2022 |
| Klos FOX Properties Ltd | Real estate | 2019 |
| Klos Group UK Limited | Construction | 2023 |
| Klos Transport Ltd | Transport & logistics | 2016 |
| Klosr Ltd | Wholesale & retail | 2026 |
| Klsg & Sons Ltd | Administrative & support | 2017 |
| KLT Ltd | Hospitality | 2025 |
| KM Fitness Ltd | Arts & recreation | 2023 |
| KMD Consultancy Ltd | Arts & recreation | 2024 |
| KMH Transport Ltd | Transport & logistics | 2015 |
| KMK Consulting Limited | Administrative & support | 2012 |
| KML Mortgage Brokerage Ltd | Financial services | 2024 |
| KML Service Ltd | Transport & logistics | 2014 |
| KMR International Ltd | Wholesale & retail | 2018 |
| KMS Plumbing and Heating Limited | Construction | 2021 |
| Kmzm Ltd. | Transport & logistics | 2018 |
| KN Cambs Ltd | Hospitality | 2026 |
| KNG4 Limited | Administrative & support | 2025 |
| Kngs Barber Ltd | Other services | 2025 |
| KNH MOT & Service Centre Ltd | Wholesale & retail | 2013 |
| Knightingale Property Group Limited | Real estate | 2021 |
| KNM Autos Ltd | Wholesale & retail | 2024 |
| KNM Project Services Limited | Construction | 2011 |
| Knox Automation Ltd | Manufacturing | 2025 |
| Kntr Limited | Other services | 2018 |
| KO Stone Flooring Ltd | Manufacturing | 2025 |
| KO Training Club Ltd | Arts & recreation | 2025 |
| Kochhouse Signatures Limited | Manufacturing | 2025 |
| Kodi Kuczek Ltd | Transport & logistics | 2026 |
| Kodi Trans Ltd | Transport & logistics | 2017 |
| Kohenor Ltd | Wholesale & retail | 2023 |
| Kojo's Trading Ltd | Wholesale & retail | 2026 |
| Kokeb Ltd | Administrative & support | 2012 |
| Koksta Limited | Construction | 2025 |
| KOL Trade Ltd | Wholesale & retail | 2026 |
| Koltuniak Ltd | Transport & logistics | 2019 |
| Komodo Fireworks Limited | Arts & recreation | 2007 |
| Konamah & SON Ltd | Wholesale & retail | 2026 |
| KONIU555 Ltd | Transport & logistics | 2013 |
| Konnexa Limited | Construction | 2023 |
| KOO79 Ltd | Health & social care | 2022 |
| Kooloir Ltd | Wholesale & retail | 2017 |
| Korent Group Limited | Financial services | 2023 |
| Korent Limited | Professional & scientific | 2023 |
| Kosa Transport Ltd | Transport & logistics | 2016 |
| Kosfinger Beats Ltd | Information & communication | 2022 |
| Kosher Bubbles Ltd | Manufacturing | 2022 |
| Kostas Smart Solutions Limited | Administrative & support | 2017 |
| Kotai Entertainment Ltd | Information & communication | 2012 |
| Kotli Logistics and Couriers Limited | Transport & logistics | 2026 |
| Kottayam Kompany Ltd | Information & communication | 2024 |
| Kowope Foods Ltd | Wholesale & retail | 2023 |
| KOZ Charcoal Grill Limited | Hospitality | 2023 |
| Kozi Haulage Ltd | Transport & logistics | 2023 |
| Kozi-Uk Trans Ltd | Transport & logistics | 2022 |
| Kozlowski Properties Ltd | Real estate | 2026 |
| KP Health and Social Care Limited | Health & social care | 2025 |
| KP Home Improvements Ltd | Construction | 2009 |
| KP Jewellers Limited | Wholesale & retail | 2021 |
| KP Konta Ceramics Ltd | Professional & scientific | 2023 |
| KP Mahamanou OIL & GAS Limited | Mining & quarrying | 2024 |
| KPB Retail Ltd | Wholesale & retail | 2025 |
| Kpccws Limited | Professional & scientific | 1946 |
| Kpdj Ltd | Wholesale & retail | 2012 |
| KPG Europe Limited | Administrative & support | 2006 |
| KPI Investments Ltd | Health & social care | 2024 |
| KPL Property Services Limited | Construction | 2016 |
| Kpopstreetfood Ltd | Hospitality | 2026 |
| KPS Consultancy Limited | Health & social care | 2024 |
| KPV Star Ltd | Administrative & support | 2026 |
| KR Banda Medcare Limited | Wholesale & retail | 2022 |
| KR Newton Consulting Ltd | Professional & scientific | 2026 |
| KR Trans Services Ltd | Transport & logistics | 2025 |
| Kr&An Transport Ltd | Transport & logistics | 2025 |
| Kraina Czarow/Wonderland Ltd | Arts & recreation | 2023 |
| Krakoa Holdings Limited | Real estate | 2024 |
| Kreios Financial Planning Ltd | Financial services | 2024 |
| Kreios Property Ltd | Real estate | 2018 |