| KMN 701 Ltd | Real estate | 2024 |
| KMN Consulting Ltd | Information & communication | 2021 |
| KMP (UK) Limited | Manufacturing | 2002 |
| Kmre (Armley) Limited | Construction | 2013 |
| Kmre (Baildon) Ltd | Construction | 2015 |
| Kmre 2020 Ltd | Construction | 2014 |
| Kmre Developments Limited | Construction | 2019 |
| Kmregroup (ATS) Ltd | Construction | 2021 |
| Kmregroup (Hindle) Ltd | Construction | 2018 |
| Kmregroup (Holdforth Court) Ltd | Construction | 2021 |
| Kmregroup (Kirkstall) Ltd | Construction | 2017 |
| Kmregroup (LB) Ltd | Construction | 2019 |
| Kmregroup (Riverside) Ltd | Construction | 2018 |
| Kmregroup (Yacht Club) Ltd | Professional & scientific | 2009 |
| Kmregroup Finance Company Ltd. | Construction | 2018 |
| KMS (LY) Ltd | Professional & scientific | 2006 |
| KMS Consultants & Associates Ltd | Professional & scientific | 2014 |
| KMS Consultants Ltd | Professional & scientific | 2012 |
| KMS Logistic Ltd | Transport & logistics | 2016 |
| Kmsproductions Limited | Transport & logistics | 2025 |
| KMT Care Consultants Ltd | Professional & scientific | 2025 |
| KMW Group Ltd | Wholesale & retail | 2023 |
| KMY Locums Limited | Health & social care | 2017 |
| KN Holdings Limited | Financial services | 2017 |
| KN Independent Ltd | Health & social care | 2023 |
| KN Photography Ltd | Professional & scientific | 2023 |
| Knapton Plant Services Limited | Manufacturing | 2002 |
| Knaresborough Aviation LLP | | 2014 |
| Knaresborough Investments (VC2) Limited | Financial services | 2017 |
| Knaresborough Investments Limited | Professional & scientific | 2001 |
| Knaresborough Real Estate Limited | Professional & scientific | 2014 |
| Knarkz Solutions Limited | Information & communication | 2015 |
| Knca Properties Limited | Real estate | 2022 |
| KND Mechanical Services Ltd | Construction | 2014 |
| Knee GUY Limited | Health & social care | 2014 |
| Knee Joint Surgery Limited | Health & social care | 2010 |
| Kneel Properties Ltd | Construction | 2020 |
| Knetik Optical Limited | Wholesale & retail | 2012 |
| Knexu Limited | Professional & scientific | 2022 |
| Knexu Sport Limited | Health & social care | 2023 |
| Knfp Holdings Limited | Financial services | 2021 |
| Knfph EOT Limited | Financial services | 2025 |
| Knight Acquisitions Limited | Real estate | 2018 |
| Knight Surveys Ltd | Professional & scientific | 2024 |
| Knightbridge Life UK Limited | Financial services | 2019 |
| Knighted Branding Ltd | Professional & scientific | 2023 |
| Knighthill Limited | Financial services | 2022 |
| Knightmoor Limited | Administrative & support | 2021 |
| Knightrider Motor Company Limited | Wholesale & retail | 2000 |
| Knights Motorcycles Ltd | Wholesale & retail | 2025 |
| Knightsbridge (CS) Limited | Real estate | 2019 |
| Knightsgate Property Group Ltd | Real estate | 2025 |
| Knightsgate Wealth Management Ltd | Financial services | 2019 |
| Knightsure Insurance Brokers Ltd | Financial services | 2006 |
| Knightsway Ltd | Information & communication | 2024 |
| KNJ Consultancy Limited | Health & social care | 2017 |
| Knkd Ltd | Health & social care | 2016 |
| KNM Motors Limited | Wholesale & retail | 2002 |
| Knori PAN Asian Ltd | Hospitality | 2024 |
| Knotfield Properties Ltd | Real estate | 2022 |
| Knotfield Vines Ltd | Agriculture & fishing | 2021 |
| Knotsaas Limited | Information & communication | 2025 |
| Knotsoflove Limited | Manufacturing | 2025 |
| Knottingley Vision Centre Ltd | Wholesale & retail | 2020 |
| Know HOW Resourcing Limited | Extraterritorial | 2014 |
| KNOWBE4 UK, Ltd. | Professional & scientific | 2017 |
| Knowledge Bridge Consultant UK Limited | Education | 2025 |
| Knowledge Heating Limited | Construction | 2025 |
| Knowledge in Health CIC | Public administration | 2023 |
| Knowledge Tree Learning LLP | | 2024 |
| Knpower Development Ltd. | Professional & scientific | 2010 |
| KNR Marketing & Office Solutions Limited | Other services | 2014 |
| KNR Practice Ltd | Health & social care | 2015 |
| KO Electrical Ltd | Construction | 2021 |
| KO GEN Health Care Ltd | Health & social care | 2024 |
| KO Shing Rotherwell Ltd | Hospitality | 2024 |
| KOA Health & Beauty Limited | Wholesale & retail | 2025 |
| Koben Limited | Hospitality | 2023 |
| Kober Limited | Manufacturing | 2010 |
| Kobet Beauty Ltd | Other services | 2023 |
| Kobi Displays Ltd | Manufacturing | 2025 |
| Koda Group Ltd | Information & communication | 2026 |
| Koda Healthcare Ltd | Public administration | 2023 |
| Koda Media Films Ltd | Information & communication | 2025 |
| Kodash Limited | Real estate | 2018 |
| Kode Limited | Administrative & support | 2005 |
| Kodiak Financial Ltd | Professional & scientific | 2024 |
| Kodiak Outsourcing Ltd | Administrative & support | 2026 |
| KOE Property Management Ltd | Real estate | 2018 |
| Koffee & Kream Ltd | Hospitality | 2022 |
| Kofi&Co. (Ilkley) Ltd | Hospitality | 2025 |
| Kofi&Co. (Roundhay) Ltd | Hospitality | 2023 |
| Kofi&Co. Ltd | Hospitality | 2020 |
| Kofwise Engineering Ltd | Manufacturing | 2022 |
| Koha Housing Limited | Real estate | 2022 |
| Kohar & Sahota Limited | Wholesale & retail | 2011 |
| Kohli & SON Investments Limited | Real estate | 2016 |
| KOI Fond Ltd | Wholesale & retail | 2021 |
| Koivu Leeds Ltd | Hospitality | 2023 |
| KOJ Holdings Limited | Financial services | 2026 |