| KAY Mobile Barber Ltd | Other services | 2024 |
| Kayan Motors Limited | Wholesale & retail | 2025 |
| Kaydee Construction & Interiors Limited | Construction | 2023 |
| Kayman Properties Limited | Real estate | 2018 |
| Kaynou Ltd | Households | 2016 |
| Kaynu Ltd | Administrative & support | 2014 |
| Kayzionliving Group Ltd | Real estate | 2026 |
| KAZ Property and Holdings Limited | Real estate | 2021 |
| KB Capital Limited | Real estate | 2011 |
| KB Medical Consulting Ltd | Health & social care | 2023 |
| KB Utilities Ltd | Construction | 2026 |
| KBB Jobs Ltd | Administrative & support | 2018 |
| KBD TFL Ltd | Construction | 2015 |
| Kbnc Services Ltd | Wholesale & retail | 2024 |
| KBR Holding Ltd | Construction | 2020 |
| KBR Properties (Bradwell) Ltd | Extraterritorial | 2007 |
| KBR Property Investments Limited | Real estate | 2003 |
| KC Hope Cleaning Ltd | Construction | 2019 |
| KCA Group 1 Ltd | Real estate | 2024 |
| KCK Parlour Ltd | Other services | 2025 |
| KD Associates London Ltd | Professional & scientific | 2017 |
| KD Seller Limited | Wholesale & retail | 2026 |
| KD Spades Limited | Wholesale & retail | 2022 |
| KDD Mortgages & Financial Solutions Ltd | Financial services | 2021 |
| KDI Ltd | Financial services | 2018 |
| KE55 Limited | Wholesale & retail | 2017 |
| Kebab Property Limited | Hospitality | 2020 |
| Kebabish Limited | Extraterritorial | 2011 |
| Kebabish Restaurant Limited | Extraterritorial | 2011 |
| Keep Cooling Limited | Construction | 2016 |
| Keep on Smiling Limited | Health & social care | 2009 |
| Keer Investments Ltd | Real estate | 2021 |
| Kein Construction Ltd | Construction | 2024 |
| Kelleimi Engineering Ltd | Construction | 2015 |
| Kelly Civils Limited | Construction | 2001 |
| Kelly Comms Limited | Administrative & support | 1998 |
| Kelly Communications Enterprises Limited | Professional & scientific | 2012 |
| Kelly Communications Group Limited | Construction | 1996 |
| Kelly Communications Limited | Construction | 1988 |
| Kelly Communications Trading Group Limited | Professional & scientific | 2009 |
| Kelly Decoration Ltd | Construction | 2019 |
| Kelly Energy Ltd | Administrative & support | 2021 |
| Kelly Energy Training Limited | Administrative & support | 1999 |
| Kelly Fibre UK Ltd | Administrative & support | 2021 |
| Kelly Fleet Services Limited | Construction | 1996 |
| Kelly Group Limited | Extraterritorial | 2015 |
| Kelly Property Company Limited | Real estate | 2003 |
| Kelly Rail Group Ltd | Construction | 2011 |
| Kelly Rail U.K. Ltd | Construction | 2002 |
| Kelly Rail UK Services Limited | Administrative & support | 2012 |
| Kelly Supply Solutions Limited | Wholesale & retail | 2009 |
| Kelly Technical Services Limited | Information & communication | 2015 |
| Kelly Traffic Management Limited | Administrative & support | 2017 |
| Kemichal UK Ltd | Wholesale & retail | 2025 |
| KEN Construction Limited | Construction | 2017 |
| Kenco Hygeine Ltd | Administrative & support | 2025 |
| Kendal Hall Management Company Limited | Administrative & support | 2004 |
| Kendal Precision Electromechanical Group Ltd | Manufacturing | 2022 |
| Kenrock Investments Limited | Real estate | 2017 |
| Kensington Hospitality Limited | Hospitality | 2017 |
| Kentgroundworker Ltd | Construction | 2025 |
| Kenton Prime Motors Ltd | Wholesale & retail | 2025 |
| Kenworth Industry (UK) Ltd | Administrative & support | 2016 |
| Kenya Jewellers Limited | Wholesale & retail | 1982 |
| Kenzi Automotive Limited | Administrative & support | 2013 |
| Keoda Limited | Information & communication | 2018 |
| Kerai Assets Management Ltd | Real estate | 2023 |
| Kerai Associates Ltd | Real estate | 2018 |
| Kerai Solutions Ltd | Information & communication | 2006 |
| Kerala Health Tours Limited | Health & social care | 2012 |
| Kerio Limited | Transport & logistics | 2009 |
| Kernel Technology Solutions Limited | Information & communication | 2013 |
| Kesar Services Limited | Real estate | 2019 |
| Kesariya Cine Production Ltd | Manufacturing | 2023 |
| Kesh Shaw Limited | Administrative & support | 2009 |
| Kesha & Rudra Limited | Real estate | 2015 |
| Kesha Ltd | Wholesale & retail | 2006 |
| Keshav Raghav Properties Ltd | Real estate | 2021 |
| Kestates Limited | Real estate | 2015 |
| Ketheesproperties Ltd | Real estate | 2018 |
| Ketna Patel Studio Limited | Arts & recreation | 2018 |
| Kevin RL Chen Limited | Wholesale & retail | 2026 |
| Kevinjodelicatessen Ltd | Wholesale & retail | 2017 |
| KEW Solar Holdings Ltd | Construction | 2023 |
| KEW Solar Ltd | Construction | 2010 |
| Key Matrix Ltd | Wholesale & retail | 2022 |
| Key to Living Ltd | Real estate | 2025 |
| Key-Ram Properties Limited | Real estate | 2023 |
| Keycure Limited | Professional & scientific | 2022 |
| Keylinxx Properties Ltd | Real estate | 2025 |
| Keynote Property Solutions Ltd | Construction | 2017 |
| Keys Autos Limited | Wholesale & retail | 2026 |
| Keys REX London Limited | Construction | 2018 |
| Keysham Court Limited | Households | 2005 |
| Keystone Living Ltd | Hospitality | 2023 |
| Keystone Properties PVT. Ltd | Real estate | 2025 |
| Keystone Property Managers Limited | Real estate | 2017 |
| Keystone Ventures Ltd | Financial services | 2018 |
| KF Pastry Traditional Ltd | Manufacturing | 2024 |
| KFL Solutions Ltd | Wholesale & retail | 2025 |