| Koncept Rail Solutions Ltd | Professional & scientific | 2018 |
| Kong & LI Limited | Real estate | 2021 |
| Konger Bakery Ltd | Manufacturing | 2024 |
| Konnect Water Solutions Ltd | Water & waste | 2018 |
| Konsept Design Limited | Information & communication | 2023 |
| Konsoul Kingdom Ltd | Wholesale & retail | 2023 |
| Konvoy UK Limited | Information & communication | 2022 |
| Koocha Mezze Bar Limited | Hospitality | 2019 |
| Koohveisi Company Limited | Professional & scientific | 2008 |
| Kooky Art Ltd | Manufacturing | 2020 |
| Koolaccounts Ltd | Professional & scientific | 2020 |
| KOP IT Ltd | Manufacturing | 2023 |
| Kopash Ltd | Transport & logistics | 2025 |
| KOQ Services Limited | Information & communication | 2024 |
| Kora Boat Ltd | Wholesale & retail | 2023 |
| Korg (UK) Limited | Wholesale & retail | 1989 |
| Kornecki Ltd | Manufacturing | 2016 |
| Koru Property Consultants Ltd | Households | 2024 |
| Korub Consultancy Ltd | Information & communication | 2016 |
| KOS Transport Ltd | Transport & logistics | 2024 |
| Kosmitkom Limited | Health & social care | 2018 |
| Kotecha CPS Ltd | Education | 2018 |
| Kotot Ltd | Information & communication | 2024 |
| Kouai Logistics Ltd | Transport & logistics | 2026 |
| Kouros Transport Ltd | Transport & logistics | 2023 |
| Kovance Group Ltd | Information & communication | 2026 |
| KOY Ventures Ltd | Manufacturing | 2021 |
| Koziai Limited | Information & communication | 2025 |
| Kozialtrans Ltd | Transport & logistics | 2015 |
| KP Menscare Ltd | Wholesale & retail | 2023 |
| KP Plastics (UK) Ltd | Manufacturing | 2003 |
| KP Wholesale & Retail Limited | Wholesale & retail | 2026 |
| KPI Properties Limited | Real estate | 2025 |
| KPM Automotive Limited | Wholesale & retail | 2014 |
| KPM Care Services Ltd | Public administration | 2022 |
| Kpmv Ltd | Information & communication | 2013 |
| KPR Empire Global Limited | Financial services | 2025 |
| KPS Group Ltd | Professional & scientific | 2017 |
| Kpsd Limited | Information & communication | 2013 |
| KR & Sons Roofing & Guttering Ltd | Construction | 2025 |
| KR Prestige Limited | Wholesale & retail | 2025 |
| KR Storage Limited | Transport & logistics | 2023 |
| Krackkitchen Ltd | Hospitality | 2025 |
| Kraft Wines Ltd | Wholesale & retail | 2024 |
| Kraftor Machinery Limited | Wholesale & retail | 2025 |
| Kraftwurkz Limited | Information & communication | 2025 |
| Krajinska Vehicle Testing Ltd | Professional & scientific | 2019 |
| Kranthi Ltd | Real estate | 2024 |
| Kratos Global Ltd | Professional & scientific | 2007 |
| Kraya Investments Ltd | Real estate | 2019 |
| Kreative Flooring Ltd | Construction | 2015 |
| Kremer Holdings Limited | Financial services | 2020 |
| Kreston Trading Limited | Other services | 2016 |
| Kreutzer Touristik GB Limited | Administrative & support | 2016 |
| Kris Commodities Ltd | Professional & scientific | 2025 |
| Krish Ideal Solutions Ltd | Information & communication | 2017 |
| Krish Soft Tech Ltd. | Information & communication | 2015 |
| Krishna Asian Food Market Limited | Wholesale & retail | 2019 |
| Krishna Asian Supermarket Ltd | Wholesale & retail | 2025 |
| Krishna Import UK Ltd | Hospitality | 2023 |
| Krishna Spirit Ltd | Real estate | 2019 |
| Krispy Foods MK Ltd | Hospitality | 2017 |
| Krisstech Ltd | Wholesale & retail | 2025 |
| KRJ Painting Services Limited | Administrative & support | 2009 |
| Krobia Afro Shop Ltd | Wholesale & retail | 2025 |
| Krolm Ltd | Administrative & support | 2025 |
| Krown Construction Ltd | Construction | 2021 |
| Krown Real Estate Ltd | Real estate | 2021 |
| KRP Installations Ltd | Construction | 2019 |
| Krsna Consultants Limited | Information & communication | 2012 |
| Kruse Kontrol Limited | Administrative & support | 2015 |
| Krust Pizza Limited | Hospitality | 2024 |
| Krystal Facilities Management Ltd | Administrative & support | 2019 |
| Krystal Hygiene Limited | Wholesale & retail | 1988 |
| Krystle Brides Limited | Wholesale & retail | 2012 |
| KS 81 Projects Ltd | Information & communication | 2009 |
| KS Auto Limited | Wholesale & retail | 2014 |
| KS E-Commerce Ltd | Wholesale & retail | 2024 |
| KS Plumbing & Building Services Limited | Construction | 2014 |
| KS Ventures Limited | Wholesale & retail | 2025 |
| Ksaa Network Limited | Information & communication | 2025 |
| Ksbs Solutions Limited | Information & communication | 2024 |
| KSF Smile Solutions Ltd | Health & social care | 2024 |
| KSH Property Limited | Real estate | 2017 |
| Kshetra Technologies Ltd | Information & communication | 2022 |
| Ksidhu Ltd | Wholesale & retail | 2024 |
| KSK Louts 97 Limited | Construction | 2025 |
| Ksmv Limited | Wholesale & retail | 2013 |
| KSP Properties Limited | Real estate | 2025 |
| KSS Care Solutions Ltd | Public administration | 2025 |
| KT Child Wellness Ltd | Education | 2025 |
| KTL & TEO Logistics Ltd | Administrative & support | 2022 |
| KTN Logistics Limited | Transport & logistics | 2020 |
| KU KU Coffee House Ltd | Hospitality | 2019 |
| Kub's Food Ltd | Manufacturing | 2025 |
| Kube Consultants Ltd | Professional & scientific | 2020 |
| Kuchen Pro Limited | Construction | 2024 |
| Kucko Games Limited | Information & communication | 2025 |
| Kudith Limited | Administrative & support | 2013 |
| Kudos Sports Management Ltd | Arts & recreation | 2025 |