| KB Professional Services Limited | Professional & scientific | 2022 |
| KB Transport Limited | Wholesale & retail | 2014 |
| KBI Commercial & Residential Ltd | Construction | 2022 |
| KC Commercial Ltd | Professional & scientific | 2022 |
| KC Haulage and Recycling Limited | Water & waste | 2025 |
| KC Rees Limited | Financial services | 2023 |
| KC Swim Academy Ltd | Education | 2025 |
| KDL7 Ltd | Construction | 2020 |
| KDS Incorporation Ltd | Hospitality | 2024 |
| Kdtl Limited | Construction | 2019 |
| KE Serviced Accommodation Ltd | Real estate | 2025 |
| Keadi Lane UK Ltd | Other services | 2015 |
| Kedco Construction Ltd | Construction | 2020 |
| KEE Scott Ltd | Administrative & support | 2019 |
| Keen 2 Assist Ltd | Administrative & support | 2021 |
| Keep IT Legal Ltd | Professional & scientific | 2020 |
| Keerthi Motors Ltd | Wholesale & retail | 2026 |
| Keilauray Fibre Ltd | Information & communication | 2024 |
| Keith Davis CUE Sports Club Limited | Hospitality | 2001 |
| Keith Davis Snooker Services Ltd | Manufacturing | 2018 |
| Kejetia Limited | Wholesale & retail | 2016 |
| Kelebek Media Limited | Information & communication | 2013 |
| Kelimacey Limited | Wholesale & retail | 2017 |
| Kellem Consultancy Services Ltd | Professional & scientific | 2019 |
| Kellies Kitchen (Corporate) Ltd | Hospitality | 2025 |
| Kellies Kitchen (Events) Ltd | Hospitality | 2025 |
| Kellies Kitchen (NO.1) Ltd | Hospitality | 2025 |
| Kellies Kitchen Ltd | Hospitality | 2025 |
| Kelliher Engineering Ltd | Professional & scientific | 2024 |
| Kelly New York Nails Ltd | Other services | 2026 |
| Kelmscott Global Ltd | Wholesale & retail | 2025 |
| Kelmscott Properties Limited | Construction | 2018 |
| Kelvedon Exotic Village Limited | Wholesale & retail | 2023 |
| Kemet Innovations Ltd | Information & communication | 2023 |
| Kemi Wear Clothing Limited | Wholesale & retail | 2026 |
| Kemlad Limited | Professional & scientific | 2021 |
| Kemora Cleaning Services Limited | Administrative & support | 2026 |
| Kemu Limited | Education | 2009 |
| KEN El-Roi Ltd | Transport & logistics | 2025 |
| Kenap Ltd | Construction | 2026 |
| Kenbod Limited | Public administration | 2022 |
| Kenect Limited | Construction | 2021 |
| Keni Ltd | Health & social care | 2010 |
| Kenito Maintenance Ltd | Administrative & support | 2017 |
| Kenkarl Ltd | Construction | 2016 |
| Kennedia Limited | Wholesale & retail | 2015 |
| Kennedy's Streatham Ltd | Hospitality | 2025 |
| Kenners Services Ltd | Other services | 2025 |
| Kennjane Properties Ltd | Real estate | 2024 |
| Kent Retina Clinic Ltd | Professional & scientific | 2022 |
| Kent Urban Livings Ltd | Real estate | 2025 |
| Kent Vehicle Services Ltd. | Real estate | 1999 |
| Kentish and Co Limited | Administrative & support | 2008 |
| Kentures Ltd | Manufacturing | 2021 |
| Kenworthy Development Ltd | Real estate | 2018 |
| Kenya Coffee Roasters Ltd. | Manufacturing | 2017 |
| Kenya Communities Abroad Ltd | Administrative & support | 2022 |
| Kenza Essex Ltd | Hospitality | 2025 |
| KER Professional Services Limited | Administrative & support | 2013 |
| Kerem Take Away Limited | Hospitality | 2025 |
| Keri International Ltd | Manufacturing | 2023 |
| Kerland Pitman Limited | Financial services | 2004 |
| Kerry Zhou SYD Limited | Professional & scientific | 2018 |
| Kersey Build Limited | Manufacturing | 2017 |
| Kersey Developments Limited | Real estate | 2023 |
| Kervan Enterprise Ltd | Hospitality | 2025 |
| Keshara Lanka (UK) Limited | Construction | 2025 |
| Keshav Consultants Ltd | Professional & scientific | 2022 |
| Keskosa Limited | Real estate | 2024 |
| Kessel Ecom Ltd | Wholesale & retail | 2025 |
| Kester Energy Services Limited | Households | 2017 |
| Keswall (Woodford) Limited | Wholesale & retail | 1958 |
| Ketos Glazing Ltd | Construction | 2026 |
| KEV Times Ltd | Administrative & support | 2025 |
| Kevin Daniel Constructions Ltd | Construction | 2015 |
| Kevin Transport Ltd | Transport & logistics | 2015 |
| Kevkrys Property Limited | Real estate | 2024 |
| KEW Building and Electrical Services Ltd | Construction | 2013 |
| KEW Karate Limited | Arts & recreation | 2014 |
| Key Living Ltd | Real estate | 2018 |
| KEY2ESTATE Properties Ltd | Real estate | 2025 |
| Keyaan Keyur Limited | Real estate | 2020 |
| Keylan Consulting Ltd | Professional & scientific | 2012 |
| Keymer Hall Burgess Hill Ltd | Health & social care | 2025 |
| Keynestz Ltd | Professional & scientific | 2020 |
| Keys to City Ltd | Real estate | 2024 |
| Keystone Property Services & Management Limited | Administrative & support | 2010 |
| Kezi Services Ltd | Health & social care | 2023 |
| Keztech Ltd | Information & communication | 2022 |
| KF01 Ltd | Construction | 2026 |
| KFD22 Limited | Wholesale & retail | 2022 |
| KG Cleaning Services Ltd | Administrative & support | 2017 |
| KG Plumbing and Services Limited | Construction | 2025 |
| KGA Print Studio Limited | Wholesale & retail | 2022 |
| KGH Assets Ltd | Real estate | 2024 |
| KGM Underwriting Services Limited | Financial services | 2017 |
| Kgmp Finance Ltd | Financial services | 2025 |
| KGN Fast Food Ltd | Hospitality | 2019 |
| KH Trader Ltd | Wholesale & retail | 2025 |
| Khadijah Pharm Ltd | Administrative & support | 2026 |