| Karzut Enterprises Limited | Construction | 2021 |
| KAS Property Estates Ltd | Real estate | 2023 |
| Kash 4 Shoes Ltd | Wholesale & retail | 2017 |
| Kashani Property Management Ltd | Real estate | 2019 |
| Kaso Accountants Limited | Professional & scientific | 2024 |
| Kason & KEL Catering Services Ltd | Hospitality | 2025 |
| Kasper PUB Co Ltd | Hospitality | 2026 |
| Kasperskyan Ltd | Wholesale & retail | 2024 |
| Kata Global Logistics Ltd | Transport & logistics | 2014 |
| Katanna Limited | Wholesale & retail | 2021 |
| Kate Ace Finishes Ltd | Construction | 2026 |
| Kate Ambrosi Consultancy Limited | Other services | 2019 |
| Kate Blunt Consulting Ltd | Administrative & support | 2024 |
| Kate Shepherd Wellbeing Ltd | Other services | 2022 |
| Kate's Cafe Lounge Limited | Hospitality | 2010 |
| Katherine Campbell Limited | Information & communication | 2026 |
| Kathleen Road Management Company Limited | Households | 1997 |
| Kathryn Davies Pharma Consulting Ltd | Professional & scientific | 2012 |
| Kathryn Edwards Life & Leadership Coaching Ltd | Administrative & support | 2026 |
| Katie Bird Films Limited | Information & communication | 2017 |
| Katie Swift Finance Limited | Professional & scientific | 2021 |
| Katipo Limited | Health & social care | 2018 |
| Katmead Limited | Construction | 2024 |
| Kaura Limited | Wholesale & retail | 2025 |
| Kaushal Enterprises Limited | Wholesale & retail | 2025 |
| Kavosh Ltd | Professional & scientific | 2022 |
| KAW Couriers Ltd | Transport & logistics | 2025 |
| Kawani Transport Ltd | Transport & logistics | 2026 |
| Kaye IT Solutions Ltd | Information & communication | 2025 |
| Kaykab Properties Limited | Real estate | 2025 |
| Kaylaccounting Limited | Professional & scientific | 2021 |
| Kayode & Co Ltd | Administrative & support | 2026 |
| Kays Care Ltd | Public administration | 2022 |
| Kazak Ltd | Hospitality | 2018 |
| Kazbak Ltd | Information & communication | 2014 |
| Kazbak Property Ltd | Real estate | 2022 |
| Kazrich Corporation Ltd | Hospitality | 2020 |
| KB GPR Surveys Ltd | Administrative & support | 2016 |
| KB Pros Ltd | Construction | 2022 |
| KB Refinery Services Limited | Administrative & support | 2005 |
| KB Surveys Management Limited | Real estate | 2022 |
| KBB Cleaning Ltd | Administrative & support | 2023 |
| KBB Medical Limited | Administrative & support | 2019 |
| KBM Consultancy Services Limited | Wholesale & retail | 2018 |
| KBM Development Group Ltd | Construction | 2021 |
| KBR Interiors Ltd | Construction | 2026 |
| KBS Metalworks Limited | Manufacturing | 2005 |
| KC Accountancy Services Limited | Professional & scientific | 2026 |
| KC Management Services and Consultancy Ltd | Professional & scientific | 2009 |
| KC Prime Ltd | Real estate | 2026 |
| KC South 2 Limited | Hospitality | 2022 |
| KC Technologies Ltd | Information & communication | 2023 |
| KCC Enterprises Limited | Hospitality | 2012 |
| Kceaod Limited | Construction | 2026 |
| KCH Brickwork Limited | Construction | 2019 |
| KCM (U.K) Ltd | Wholesale & retail | 2017 |
| KCM Limited | Professional & scientific | 2002 |
| KCW Logistics Limited | Transport & logistics | 2025 |
| KD Consultancy (London) Ltd | Professional & scientific | 2023 |
| KD Entertainment Limited | Arts & recreation | 2019 |
| Kdal Limited | Administrative & support | 2013 |
| Kdisson Limited | Construction | 2016 |
| KDK Developments (South) Ltd | Construction | 2022 |
| KDR 55 Limited | Real estate | 2012 |
| Kdsekseledt Ltd | Manufacturing | 2026 |
| KDW Estates Limited | Extraterritorial | 2007 |
| KEA Developments Limited | Construction | 2005 |
| Keating Interiors Limited | Professional & scientific | 2004 |
| Keats Fearn Limited | Real estate | 2013 |
| Keats Yard Residents Company Limited | Households | 2002 |
| Kebab Zorbas Limited | Hospitality | 2025 |
| Kebaboss Ltd | Hospitality | 2026 |
| Keban Retail Limited | Extraterritorial | 2014 |
| Keble Electrical Ltd | Construction | 2025 |
| Kechni Limited | Hospitality | 2011 |
| Keep Pushing Forward Ltd | Professional & scientific | 2023 |
| Keepsafe U.K. | | 1997 |
| Keer Logistics Ltd | Wholesale & retail | 2018 |
| Kehyor Limited | Health & social care | 2024 |
| Keith Forfar Limited | Wholesale & retail | 2004 |
| Keith John Richards Ltd | Extraterritorial | 2025 |
| Keith News Limited | Professional & scientific | 1999 |
| Keith Porter Consultancy Limited | Financial services | 2003 |
| Keitmore Couriers Ltd | Transport & logistics | 2025 |
| Kelebek Consulting Ltd | Administrative & support | 2008 |
| Kellisum Cars Ltd | Wholesale & retail | 2018 |
| Kelly Food Limited | Hospitality | 2025 |
| Kellybell Event Stylist and Decoration Hire Ltd | Other services | 2014 |
| Kelmay Limited | Professional & scientific | 2006 |
| Kelseybuild Limited | Construction | 2021 |
| Kelvin Laboratories Limited | | 1983 |
| KEM Logistics Ltd | Transport & logistics | 2024 |
| Kemet Electronics Limited | Professional & scientific | 1992 |
| Kemfon Ltd | Wholesale & retail | 2025 |
| Kemp Wash Ltd | Administrative & support | 2022 |
| Kemp's Shipyard Limited | Real estate | 1953 |
| Kempsey Garden Maintenance Ltd | Administrative & support | 2023 |
| Kempson Food Services Limited | Transport & logistics | 1986 |
| Kemrot Associates Limited | Professional & scientific | 2016 |
| KEN Freivokh Design LLP | | 2008 |