| Kendle Building Ltd | Construction | 2016 |
| Kendle Property Ltd | Real estate | 2021 |
| Kenhold Properties Ltd | Real estate | 2018 |
| Kenley Health Care Limited | Health & social care | 2022 |
| Kenley Support Services CIC | Hospitality | 2025 |
| Kenmark Kitchens Ltd | Hospitality | 2020 |
| Kennadex Limited | Professional & scientific | 2005 |
| Kennally Plant Hire & Groundworks Ltd | Construction | 2022 |
| Kennally Property Ltd | Construction | 2021 |
| Kenneally Property Services Limited | Real estate | 2008 |
| Kennedy Wild Birds Food UK Ltd | Manufacturing | 2022 |
| Kennings Automotive Limited | Wholesale & retail | 2020 |
| Kennvad Publishing Limited | Extraterritorial | 2009 |
| Kenroe Event Rentals and Home Help Services Ltd | Administrative & support | 2014 |
| Kentish Building Surveying Ltd | Professional & scientific | 2023 |
| Kenwatch Group Limited | Other services | 2016 |
| KEO Carpentry Limited | Construction | 2018 |
| KEO Consult Ltd | Manufacturing | 2024 |
| Kepenek Juice Ltd | Wholesale & retail | 2021 |
| Kepp Interior Limited | Construction | 2019 |
| Kerala Hub Limited | Hospitality | 2023 |
| Kerdon Electrical Ltd | Construction | 2018 |
| Kerede Property Management Limited | Administrative & support | 2016 |
| Kereo Ltd | Information & communication | 2026 |
| Keshco Holdings Limited | Financial services | 2011 |
| Keshco Limited | Construction | 1990 |
| Keshco Stores Limited | Wholesale & retail | 2025 |
| Kestead Home Improvements Ltd | Construction | 2023 |
| Kestead Ltd | Real estate | 2020 |
| Kestrel Carpenters Ltd | Construction | 2013 |
| Kestrel Crane Hire Ltd | Administrative & support | 2019 |
| Kestrel Cranes Ltd | Administrative & support | 2019 |
| Kestrel Employee Ownership Trustee Limited | Professional & scientific | 2025 |
| Kestrel Rentals Ltd | Real estate | 2019 |
| Kestrel Safety Systems Ltd | Construction | 2017 |
| Kestrel Timber Frame Limited | Construction | 2006 |
| Kestrel Timber Systems Limited | Construction | 2011 |
| Ketcad Long ROW Ltd | Real estate | 2026 |
| Ketcad Ltd | Real estate | 2026 |
| Kettering Installations Services Limited | Construction | 2021 |
| Kettering Osteopaths Limited | Health & social care | 2014 |
| Kettle PPE Ltd | Manufacturing | 2020 |
| Keturah's Kitchen Limited Partnership | | 2022 |
| Keverics Custom Fabrications Ltd | Manufacturing | 2020 |
| Kevin Allsop Architects Limited | Professional & scientific | 2015 |
| Kevin Day (Streatham) Ltd | Health & social care | 2017 |
| Kevin Day (Thornton Heath) Ltd | Health & social care | 2017 |
| Kevin Eccles SPV2 Ltd | Real estate | 2025 |
| Kevin John Payne Ltd | Extraterritorial | 2022 |
| Kevin Lappage Sampling Ltd | Construction | 2013 |
| Kevin Sanders Boxing Club Community Interest Company | Arts & recreation | 2026 |
| KEVIN2018 Ltd | Administrative & support | 2019 |
| Kevinfenn.Com Limited | Information & communication | 2025 |
| Kevingeorge Ltd | Transport & logistics | 2019 |
| Kexton Trading Limited | Information & communication | 2014 |
| Key Creations Ltd | Wholesale & retail | 2019 |
| Key Developments Ltd | Real estate | 2007 |
| Key Financial Wealth Consultants Limited | Financial services | 2012 |
| Key FP Limited | Financial services | 2013 |
| Key FP Planning Ltd | Financial services | 2013 |
| Key Lettings U.K. Ltd | Households | 2017 |
| Keydown Software Ltd | Information & communication | 2018 |
| Keylanathan Ltd | Real estate | 2025 |
| Keymer Construction Ltd | Construction | 2024 |
| Keypoint Investors Ltd | Real estate | 2024 |
| Keys Academies Trust | Education | 2017 |
| Keystone Civils Limited | Construction | 2025 |
| Keystone Construction Group Ltd | Construction | 2025 |
| Keystone Development Group Ltd | Construction | 2024 |
| Keystone Property Management Services Ltd | Real estate | 2008 |
| Keystone Strategic Ltd | Professional & scientific | 2026 |
| Keystones Property Services Ltd | Real estate | 2022 |
| Keyzauto Services Ltd | Wholesale & retail | 2026 |
| Kezara Ltd | Administrative & support | 2023 |
| KF Logistics Ltd | Transport & logistics | 2021 |
| KF Veterinary Dentistry Ltd | Professional & scientific | 2019 |
| KFE Holdings Limited | Administrative & support | 2015 |
| KFM Services and Trading Ltd | Administrative & support | 2024 |
| KFP Investment Solutions Limited | Financial services | 2014 |
| KG Barber Cambs Ltd | Other services | 2024 |
| KG Global Commerce Ltd | Wholesale & retail | 2026 |
| KG Rootco Limited | Administrative & support | 2025 |
| KG Shisha Ltd | Hospitality | 2024 |
| Kgbp Ltd | Construction | 2015 |
| KGF Classic Cars Limited | Wholesale & retail | 2013 |
| KGT Group Ltd | Real estate | 2024 |
| KGT Hotels Limited | Real estate | 2025 |
| KH Autohaus Ltd | Wholesale & retail | 2025 |
| KH Motor Sales Ltd | Wholesale & retail | 2025 |
| Khabeb Limited | Real estate | 2008 |
| Khadgamai Ltd | Hospitality | 2023 |
| Khaleel Properties Limited | Real estate | 2009 |
| Khalifa Fruit and VEG Coventry Limited | Wholesale & retail | 2025 |
| Khalifa Fruit and VEG Watford Limited | Wholesale & retail | 2026 |
| Khalil Capital Consulting Ltd | Professional & scientific | 2025 |
| Khalil Law Ltd | Professional & scientific | 2025 |
| Khan & Co Estates Ltd | Real estate | 2024 |
| Khan & Co. Ltd | Wholesale & retail | 2026 |
| Khan Food Peterborough Limited | Wholesale & retail | 2017 |
| Khan Seafood Ltd | Wholesale & retail | 2004 |