| Kenilworth Hospitality Limited | Hospitality | 2026 |
| Kenilworth Logistics Ltd | Transport & logistics | 2014 |
| Kennedy Consultant Services Limited | Professional & scientific | 2021 |
| Kennedy Keats Ltd | Wholesale & retail | 2025 |
| Kennedy N Karayi Ltd | Real estate | 2023 |
| Kenneth Marvin Limited | Real estate | 1959 |
| Kenney Limited | Real estate | 2021 |
| Kennings-Build Ltd | Construction | 2022 |
| Kenns LLP | | 2003 |
| Kenny's Care Limited | Health & social care | 2021 |
| Kennywalecare Services Ltd | Health & social care | 2023 |
| Kenosis Accounting and Training Ltd | Professional & scientific | 2024 |
| Kensignton Events Ltd | Administrative & support | 2025 |
| Kensington & Chelsea Co Limited | Real estate | 2018 |
| Kensington Financial Limited | Financial services | 2019 |
| Kensington Gardens Properties Limited | Real estate | 2023 |
| Kensworth Paramount Ltd | Transport & logistics | 2014 |
| Kent Littler Co Ltd | Financial services | 2020 |
| Kent Porter Warren Ltd | Construction | 2008 |
| Kent-Haul International Limited | Transport & logistics | 1993 |
| Kentez Ltd | Real estate | 2024 |
| Kentocandles Ltd | Manufacturing | 2023 |
| Kenton Doors Limited | Construction | 2007 |
| Kenton Estates Limited | Other services | 2015 |
| Kenyon Parmar Holdings Limited | Financial services | 2025 |
| Kenz UK Ltd | Professional & scientific | 2023 |
| Keotron Ltd | Wholesale & retail | 2025 |
| Kepa Limited | Other services | 2007 |
| Kept Finance Limited | Professional & scientific | 2012 |
| Kepta Light and Sounds Limited | Information & communication | 2024 |
| Kerala Ayurveda Centre - Leeds Limited | Other services | 2014 |
| Kerala Ayurveda Centre Limited | Health & social care | 2004 |
| Kerala Ayurveda Clinic Ltd | Health & social care | 2006 |
| Kerala International Limited | Administrative & support | 2001 |
| Keralaexpressuk Ltd | Wholesale & retail | 2026 |
| Kerb Line UK Ltd | Construction | 2022 |
| Kermix Ltd | Wholesale & retail | 2025 |
| Kerova Systems Ltd | Agriculture & fishing | 2026 |
| Kerrington Developments Limited | Real estate | 1988 |
| Kerrison Close Limited | Construction | 2019 |
| Kerry’S Cakes and Bakes Ltd | Wholesale & retail | 2023 |
| Kesari One Ltd | Health & social care | 2023 |
| Kesavan & T Limited | Wholesale & retail | 2022 |
| Kesh Barbers Ltd | Other services | 2024 |
| Kesh Consulting Ltd | Health & social care | 2022 |
| Keshal Autumn Ltd | Wholesale & retail | 2024 |
| Keshav Retail Ltd | Wholesale & retail | 2025 |
| Keshwala & Sons Limited | Real estate | 2020 |
| Keshwala Group Limited | Real estate | 2021 |
| Keshwala Holdings Limited | Real estate | 2016 |
| Keshwala JLR Bodyworks Ltd | Wholesale & retail | 2025 |
| Keshwala Kazoku Holdings Limited | Financial services | 2026 |
| Keshwala Limited | Wholesale & retail | 2018 |
| Keshwala Real Estate Ltd | Construction | 2026 |
| Kesters Nook Holdings Limited | Financial services | 2021 |
| Kesters Nook Limited | Professional & scientific | 2019 |
| Keswick Electrical Limited | Construction | 2003 |
| Keswick House Living Ltd | Households | 2019 |
| Ketan Consultancy Ltd | Information & communication | 2011 |
| Ketan Surani Design Ltd | Professional & scientific | 2025 |
| Ketomed Ltd | Health & social care | 2011 |
| Ketrac Group UK Ltd | Real estate | 2020 |
| Kettell Windows Ltd | Construction | 2005 |
| Kettlebrookdesign Ltd | Wholesale & retail | 2026 |
| Ketton Stone (Masonry & Fixing) Limited | Construction | 1992 |
| KEV Cleaning Service Ltd | Administrative & support | 2026 |
| KEV Electrofix Ltd | Manufacturing | 2018 |
| KEV Taylor Construction Limited | Construction | 2013 |
| Kevin Ashley Flooring Limited | Construction | 2014 |
| Kevin Clark Joinery Limited | Construction | 2014 |
| Kevin Day Construction Limited | Construction | 2006 |
| Kevin Williams Consulting Limited | Information & communication | 2017 |
| KEW Bridge Real Estates Limited | Real estate | 2024 |
| KEW10 Developments Ltd | Construction | 2023 |
| KEW10 Fixit Ltd | Construction | 2025 |
| KEW10 Properties Ltd | Real estate | 2021 |
| Key & Co Estates Ltd | Real estate | 2026 |
| Key 2 the Door Properties Ltd | Real estate | 2024 |
| Key 4 Tax Limited | Professional & scientific | 2016 |
| Key Bioherbs Limited | Wholesale & retail | 2023 |
| Key Event Equipment Ltd | Administrative & support | 2022 |
| Key Genie Limited | Real estate | 2020 |
| Key Line Properties Limited | Real estate | 2014 |
| Key Maintenance Group Limited | Administrative & support | 2023 |
| Key Parker Limited | Professional & scientific | 1981 |
| Key Security (East Mids) Ltd | Administrative & support | 2026 |
| Key Shore Limited | Construction | 2001 |
| Key Superior Consultancy Ltd | Professional & scientific | 2026 |
| Key to Housing Limited | Real estate | 2022 |
| Key Transitions Ltd | Health & social care | 2012 |
| KEY3 Ltd | Real estate | 2025 |
| Keyaan Engineering Ltd | Information & communication | 2017 |
| Keybridge Healthcare Limited | Health & social care | 2023 |
| Keycrest Estates Limited | Construction | 2018 |
| Keydown Limited | Real estate | 1994 |
| Keyham Properties Limited | Professional & scientific | 1989 |
| Keyham Renewables Limited | Construction | 2025 |
| Keyham Retreat Limited | Hospitality | 2023 |
| Keyham Roofing Ltd | Construction | 2010 |
| Keyhole Developments Midlands Ltd | Construction | 2019 |