| Key Part Solutions Ltd | Professional & scientific | 2016 |
| Key Rental Properties Ltd | Real estate | 2025 |
| Keychoice Underwriting Limited | Financial services | 2009 |
| Keystone Bridge Limited | Administrative & support | 2022 |
| Keystone Holdings Estates Ltd | Real estate | 2025 |
| Kez's Spicy House Ltd | Hospitality | 2023 |
| KFL Properties Ltd | Real estate | 2024 |
| KH Icare Limited | Health & social care | 2021 |
| Kh.Kofihaus Limited | Hospitality | 2025 |
| Khalil Holdings Ltd | Real estate | 2016 |
| Khalji Ltd | Information & communication | 2019 |
| Khan AI Software Limited | Information & communication | 2025 |
| Khan Exports Ltd | Wholesale & retail | 2025 |
| Khanco SPV Ltd | Real estate | 2021 |
| Khans Grocery Store Ltd | Wholesale & retail | 2024 |
| KHR Locum Ltd | Health & social care | 2022 |
| Khurshid Anwar DAR Limited | Wholesale & retail | 2025 |
| KI Property Holdings Limited | Real estate | 2023 |
| Kiddi-Creche Private Day Nurseries Limited | Other services | 2000 |
| Kidlington Carpets and Flooring Ltd | Other services | 2012 |
| Kids Collective Retail Limited | Wholesale & retail | 2015 |
| Kilburn Automotive Services Limited | Wholesale & retail | 2017 |
| Kiln Dried Logs Halifax Ltd | Agriculture & fishing | 2024 |
| Kilncroft Ltd | Wholesale & retail | 2011 |
| Kimberley Kilner Equine Dental Services Ltd | Professional & scientific | 2022 |
| KIN Thai Eatery Limited | Hospitality | 2023 |
| KIN Thai Limited | Wholesale & retail | 2020 |
| Kindling Bridal Limited | Professional & scientific | 2017 |
| Kindred Management Limited | Professional & scientific | 2025 |
| Kindred Properties Limited | Real estate | 2018 |
| Kindus Ltd | Information & communication | 2016 |
| Kindus Solutions Ltd | Information & communication | 2010 |
| King Cross Properties Ltd | Real estate | 2026 |
| Kino & Co. Limited | Real estate | 1913 |
| Kino Holdings Ltd | Financial services | 2023 |
| Kirkstall Timber Limited | Manufacturing | 1992 |
| KIS U.K. Limited | Information & communication | 2019 |
| Kisaka Holdings Limited | Financial services | 2022 |
| Kisdon & Maple Limited | Real estate | 2018 |
| KIT Hill Properties Limited | Real estate | 2016 |
| Kitrich Limited | Construction | 2020 |
| Kiva Smile Limited | Health & social care | 2024 |
| Kixx Halifax Ltd | Education | 2020 |
| Kiyaan Ltd | Real estate | 2025 |
| KJ 'S Investment Ltd | Real estate | 2021 |
| KJA Halifax Limited | Manufacturing | 2010 |
| Kjaa Ltd | Wholesale & retail | 2025 |
| KJD Transport Ltd | Transport & logistics | 2025 |
| KK Kustoms Ltd | Wholesale & retail | 2017 |
| KK Plumbing & Heating (Yorkshire) Ltd | Construction | 2025 |
| Kk’S Logistics Ltd | Transport & logistics | 2026 |
| KL88 Ltd | Wholesale & retail | 2010 |
| Klbm Ltd | Wholesale & retail | 2025 |
| Kldd Limited | Hospitality | 2024 |
| Klinika Aesthetics & Wellbeing Limited | Other services | 2025 |
| KLM Hair @ 43 Limited | Other services | 2014 |
| KM Nurse Aesthetics Limited | Other services | 2025 |
| KMA Retail Ltd | Wholesale & retail | 2025 |
| KMC Project Solutions Ltd | Information & communication | 2026 |
| Kmcr Construction Limited | Construction | 2017 |
| KMH Glazing Ltd | Construction | 2025 |
| Kmhd Entertainment Limited | Other services | 2025 |
| KML (Holdings) Ltd | Financial services | 2014 |
| KMX Logistics Ltd | Transport & logistics | 2020 |
| KN Accounting & Bookkeeping Ltd | Professional & scientific | 2025 |
| Knapton & Knapton Limited | Professional & scientific | 2007 |
| KNG of Vape Ltd | Wholesale & retail | 2024 |
| Knight Key Limited | Real estate | 2006 |
| Knight Key Properties Limited | Real estate | 2023 |
| Knight Rehabilitation Limited | Health & social care | 2021 |
| Knightsbridge Court Limited | Real estate | 2004 |
| Knightsbridge Wealth Management Limited | Financial services | 2011 |
| Knitting by Post Limited | Wholesale & retail | 2016 |
| Knox Supply Chain Ltd | Professional & scientific | 2026 |
| Kobeda Box Limited | Hospitality | 2025 |
| Kobeda Guys Ltd | Hospitality | 2023 |
| Kobeda Stop Ltd | Hospitality | 2026 |
| Kodedication Limited | Information & communication | 2025 |
| Koibito Leeds Ltd | Hospitality | 2016 |
| Koivu Digital Limited | Information & communication | 2025 |
| Konicare Limited | Health & social care | 2024 |
| Kovger Transport Ltd | Transport & logistics | 2017 |
| KOWAL4 Ltd | Real estate | 2023 |
| Kozao Limited | Professional & scientific | 2016 |
| KPM Private Limited | Real estate | 2021 |
| KPS Campers Ltd | Wholesale & retail | 2025 |
| KPS Graphics Ltd | Professional & scientific | 2023 |
| KR Care Solutions Ltd | Public administration | 2022 |
| KRA Accountants Limited | Professional & scientific | 2014 |
| KRA Audit Services Ltd | Professional & scientific | 2024 |
| Krowdrah Investments Ltd | Financial services | 2020 |
| KSH Motors Limited | Wholesale & retail | 2020 |
| KTL Business Solutions Ltd | Transport & logistics | 2026 |
| Kton Consulting Ltd | Information & communication | 2020 |
| KU Family Investments Ltd | Financial services | 2025 |
| Kubb Kulture Recordings Limited | Information & communication | 2023 |
| Kudos Leasing Ltd | Extraterritorial | 2006 |
| Kudos Vehicle Management Limited | Other services | 2003 |
| Kwai Hing Ltd | Hospitality | 2026 |
| Kwik-Klik Hoardings Limited | Administrative & support | 2005 |