| King Creative Services Limited | Administrative & support | 2017 |
| King Henry Productions Ltd | Information & communication | 2016 |
| Kingdom IT Services Ltd | Information & communication | 2014 |
| Kings Legal Group Ltd | Professional & scientific | 2024 |
| Kingsbridge Optics Ltd | Wholesale & retail | 2017 |
| Kingsclere Properties Limited | Real estate | 2021 |
| Kinita Limited | Wholesale & retail | 2009 |
| Kinita Residential Ltd | Real estate | 2020 |
| Kinnik Ltd | Other services | 2024 |
| Kinsale Estates Ltd | Real estate | 2024 |
| Kinslade Ltd | Real estate | 2026 |
| Kirti Estates Limited | Real estate | 2021 |
| Kirton Real Estate Consulting Ltd | Real estate | 2022 |
| Kisheera Limited | Health & social care | 2019 |
| Kishy Construction Ltd | Construction | 2025 |
| Kiskeam Limited | Professional & scientific | 2010 |
| Kiss the Frog Productions Ltd | Administrative & support | 2011 |
| KIT Contractors Ltd | Construction | 2008 |
| KIT London Ltd | Real estate | 2019 |
| Kitchen by KS Ltd | Hospitality | 2023 |
| Kitchen Curry Ltd | Hospitality | 2026 |
| Kitchens&Interiors Ltd | Wholesale & retail | 2014 |
| Kittyfashion Ltd | Manufacturing | 2018 |
| Kitwiki Holding Limited | Financial services | 2017 |
| KK Design LAB Ltd | Professional & scientific | 2026 |
| KK Investment Group Limited | Construction | 2023 |
| KK Investments 247 Ltd | Real estate | 2025 |
| KKR Pharma Ltd | Financial services | 2025 |
| KKS Milestone Ltd | Information & communication | 2025 |
| Klickvision Limited | Professional & scientific | 2018 |
| Kloudsourcing Ltd | Professional & scientific | 2020 |
| KM Triskelion Limited | Professional & scientific | 2026 |
| KMD Properties Investment Ltd | Real estate | 2023 |
| KMK Carwash Ltd | Other services | 2017 |
| Kmra Limited | Health & social care | 2014 |
| Kmsr Properties Limited | Real estate | 2018 |
| KMW Construction Limited | Construction | 2021 |
| Knass Perfumeria Ltd | Wholesale & retail | 2021 |
| KNB Dental Services Limited | Health & social care | 2016 |
| KND Construction Limited | Construction | 2007 |
| Knights Classics Ltd | Wholesale & retail | 2017 |
| Knightsbridge Health Consulting Ltd | Health & social care | 2025 |
| Knobzz Ltd | Manufacturing | 2023 |
| Knock My Door Ltd | Health & social care | 2022 |
| Knova Consultancy Limited | Real estate | 2025 |
| Knova Dynamics Limited | Real estate | 2025 |
| Knova Property Investments Limited | Real estate | 2025 |
| Knova Real Estate Group Limited | Real estate | 2018 |
| Knowledge-Action-Change Limited | Administrative & support | 2011 |
| KNP Medical Ltd | Health & social care | 2024 |
| Kobe London Limited | Financial services | 2022 |
| Kobie & Co Limited | Real estate | 2026 |
| Koira Communications Ltd | Information & communication | 2019 |
| Kojesh Holdings Ltd | Financial services | 2025 |
| Konrai Properties Ltd | Real estate | 2021 |
| Konverged Solutions Ltd | Information & communication | 2015 |
| Kosmesis Limited | Wholesale & retail | 2012 |
| KOSTA-97 Ltd | Hospitality | 2019 |
| Kostadin Hristov Ltd | Construction | 2007 |
| Kotak Mortgage & Protection Ltd | Financial services | 2022 |
| Kowloon Pacific Ltd | Professional & scientific | 2012 |
| KP Facilities Ltd | Administrative & support | 2023 |
| KPA Investments UK Ltd | Real estate | 1993 |
| KPD99 Ltd | Information & communication | 2025 |
| KPF Construction Ltd | Construction | 2019 |
| KPM Asset Global (UK) Limited | Financial services | 2020 |
| Kpny Ltd | Information & communication | 2015 |
| Kpoint Partners Ltd | Real estate | 2021 |
| KPS Care Limited | Hospitality | 2017 |
| KPS One Care Limited | Hospitality | 2017 |
| Kpsr Accounting Limited | Professional & scientific | 2013 |
| Kpsr Construction Limited | Real estate | 2021 |
| Kpsr Developments Limited | Real estate | 2021 |
| Kpsr Holdings Limited | Financial services | 2018 |
| Kpsr Investments Limited | Construction | 2018 |
| Kpsr Legal Limited | Professional & scientific | 2022 |
| Kpsr LLP | | 2013 |
| Kpsr Properties Limited | Real estate | 2022 |
| Kpsr Real Estate Limited | Construction | 2018 |
| Kpsr Retail Limited | Hospitality | 2023 |
| Kram Developer Ltd | Construction | 2025 |
| Krav Maga URI Refaeli UK Ltd | Other services | 2019 |
| Kreneon Ltd | Professional & scientific | 2026 |
| KRG Ventures Limited | Financial services | 2022 |
| Kripasai Limited | Real estate | 2020 |
| Krirosh Property Limited | Real estate | 2019 |
| Krish Fruit & VEG Limited | Wholesale & retail | 2009 |
| Krisha Estates Limited | Real estate | 2020 |
| Krishani Ltd | Health & social care | 2025 |
| Krishna Infotech Private Ltd | Information & communication | 2015 |
| Krishna Medical Care Limited | Health & social care | 2012 |
| Krishna Property Development (UK) Ltd | Real estate | 2020 |
| KRN Enterprises Ltd | Wholesale & retail | 2025 |
| Kronos Estate Agents Harrow Ltd | Real estate | 2023 |
| Kronos Estate Agents Ltd | Real estate | 2017 |
| KS Caterers Limited | Hospitality | 2013 |
| KSA Global Trading UK Ltd | Construction | 2020 |
| KSI Capital Limited | Financial services | 2024 |
| KSI Medics Limited | Health & social care | 2014 |
| Ksmp Health Ltd | Financial services | 2024 |