| KDH Consulting Engineers Limited | Administrative & support | 2025 |
| Kdhs Services Limited | Administrative & support | 2009 |
| KDM Supplies Limited | Wholesale & retail | 2002 |
| Kdpuram Technologies Limited | Information & communication | 2011 |
| Kean Home Ltd | Real estate | 2026 |
| Kedros IT Limited | Administrative & support | 2013 |
| Keegan Family Holdings Limited | Professional & scientific | 2024 |
| Keegan Investment Group Limited | Financial services | 2026 |
| Keelagher Okey Associates Limited | Administrative & support | 2002 |
| Keelagher Okey Associates Trustees Limited | Professional & scientific | 2024 |
| Keeley Developments (Rainwater Systems) Ltd | Construction | 2014 |
| Keeley Developments Ltd | Real estate | 2014 |
| Keeling Catering Engineers Limited | Manufacturing | 2001 |
| Keen Engineering Consultancy Limited | Administrative & support | 2014 |
| Keep Improving Ltd | Professional & scientific | 2014 |
| Keep IT Simple Design Ltd | Professional & scientific | 2025 |
| Keep IT Simply Stylish Ltd | Wholesale & retail | 2026 |
| Keeper's Beauty Limited | Other services | 2022 |
| Kegsnblades Limited | Wholesale & retail | 2011 |
| Keith Mason Transport Limited | Wholesale & retail | 1980 |
| Keith Sayers Limited | Professional & scientific | 2018 |
| Keith Technical Services Limited | Administrative & support | 2011 |
| Kelbie Digital Ltd | Information & communication | 2019 |
| Kelco Engineering Consultants Limited | Administrative & support | 2007 |
| Kelco Limited | Financial services | 1926 |
| Kellen Homes (GM) Limited | Real estate | 2021 |
| Kellen Homes Holdco Limited | Real estate | 2020 |
| Kellen Homes Limited | Real estate | 2020 |
| Kellen Partnerships Limited | Real estate | 2020 |
| Kelloggs Limited | Extraterritorial | 2023 |
| Kelly's Kennels Ltd | Wholesale & retail | 2013 |
| Kelmscott Holdings Limited | Financial services | 2023 |
| Keln Project Management Limited | Professional & scientific | 2018 |
| Kelrm Ltd | Information & communication | 2016 |
| Kelsey Networks Limited | Information & communication | 2001 |
| Kelvin Bailey Limited | Administrative & support | 2015 |
| Kelvin Humphreys Ltd | Administrative & support | 2022 |
| Kemanova Ltd | Information & communication | 2025 |
| Kembams Ltd | Information & communication | 2019 |
| Kemof Ltd | Health & social care | 2017 |
| Kemper System Limited | Wholesale & retail | 1997 |
| KEN Birch Design Limited | Information & communication | 2017 |
| KEN Harrop Crane Hire Ltd | Administrative & support | 2016 |
| Kenect Recruitment (NW) Limited | Professional & scientific | 2019 |
| Kenji (JV) Limited | Wholesale & retail | 2018 |
| Kenji (London) Limited | Wholesale & retail | 2023 |
| Kenji (UK) Limited | Wholesale & retail | 2014 |
| Kenji Midlands Limited | Wholesale & retail | 2022 |
| Kenji Retail Limited | Wholesale & retail | 2020 |
| Kenji Technology Limited | Information & communication | 2021 |
| Kenneth & Caleb Ltd | Real estate | 2021 |
| Kenningtonadmin Ltd | Administrative & support | 2025 |
| Kenoz Warrington Ltd | Wholesale & retail | 2024 |
| Kensteria Solutions Ltd | Administrative & support | 2022 |
| Kentmere Consulting Limited | Administrative & support | 2024 |
| Kenton Trueman Limited | Information & communication | 2013 |
| Kenyon Cutters Limited | Administrative & support | 2020 |
| Keough Industries Ltd | Manufacturing | 2023 |
| Kerdel Ltd | Construction | 2014 |
| Kermack UK Limited | Information & communication | 2017 |
| Kernow Construction Consultancy Services Limited | Administrative & support | 2011 |
| Kero Limited | Financial services | 2017 |
| Kerrycare Commissioning Limited | Public administration | 2023 |
| Kerrymount Limited | Health & social care | 2020 |
| Kesh Ltd | Administrative & support | 2023 |
| Keswick Retreats Ltd | Real estate | 2025 |
| Keswick Retreats Management Ltd | Real estate | 2025 |
| Ketchup TV Group Limited | Administrative & support | 2019 |
| Kettle Electrical Services Ltd | Construction | 2024 |
| Kettle on Productions Limited | Arts & recreation | 2026 |
| KEV Rock Planning Consultancy Limited | Administrative & support | 2015 |
| Kevin Engall Ltd | Administrative & support | 2008 |
| Kevin Tache Ltd | Transport & logistics | 2018 |
| Kevin Troy Walker Ltd | Administrative & support | 2025 |
| Kevin Wright Design Consultancy Limited | Professional & scientific | 2026 |
| Kevlaa Financial Limited | Professional & scientific | 2013 |
| Kevlin Site Services Ltd | Construction | 2025 |
| Keypod Digital Ltd | Administrative & support | 2026 |
| Keys Hill Park Limited | Health & social care | 2008 |
| Keys Marketing Ltd | Professional & scientific | 2022 |
| Keys Procurement Ltd | Professional & scientific | 2023 |
| Keystone AI Business Solutions Ltd | Information & communication | 2026 |
| KF Digital Consultancy Ltd | Administrative & support | 2024 |
| KG Commerce Ltd | Professional & scientific | 2023 |
| Kg-Wellness Limited | Extraterritorial | 2015 |
| KGI Holdings Limited | Real estate | 2023 |
| KGR Services Ltd | Hospitality | 2021 |
| KH Aviation Ltd | Administrative & support | 2025 |
| KH Locke Limited | Information & communication | 2020 |
| KH Projects Ltd | Professional & scientific | 2025 |
| KH Properties NW Limited | Real estate | 2022 |
| Khalid Healthcare Limited | Health & social care | 2016 |
| Khan Car Sales Ltd | Wholesale & retail | 2023 |
| Khan MOT Centre Ltd | Wholesale & retail | 2022 |
| Khari Property Investments Ltd | Real estate | 2017 |
| Khermis Plus Ltd | Wholesale & retail | 2025 |
| Khiron Ltd | Professional & scientific | 2019 |
| KHM Planning Limited | Administrative & support | 2015 |
| KHM Site Management Solutions Limited | Administrative & support | 2016 |
| Khurmis OFF Licence (Warrington) Ltd | Wholesale & retail | 2025 |