| KKD Lettings Limited | Real estate | 2021 |
| Kkslough UK Ltd | Hospitality | 2023 |
| Kksoujanya Consultancy Services Ltd | Information & communication | 2019 |
| KL Manes Ltd | Transport & logistics | 2016 |
| Klass Marquees Group Ltd | Construction | 2026 |
| Klaymed Limited | Other services | 2024 |
| Kleena Limited | Health & social care | 2023 |
| Klick Services Limited | Wholesale & retail | 2022 |
| Kliktik Ltd | Wholesale & retail | 2024 |
| Klockit Limited | Education | 2025 |
| Klose Brothers Group Ltd | Hospitality | 2024 |
| KLS Lawns Ltd | Administrative & support | 2024 |
| Klsd Property Management Ltd | Real estate | 2020 |
| Klutch Digital Limited | Information & communication | 2025 |
| Klya Ltd | Wholesale & retail | 2026 |
| KM Planning Ltd | Wholesale & retail | 2022 |
| KM Pro IT Services Limited | Information & communication | 2018 |
| KM Procurement Services Limited | Administrative & support | 2014 |
| KMF Production Services Ltd | Administrative & support | 2015 |
| KMG Procare Services Ltd | Administrative & support | 2025 |
| KMI Ltd | Health & social care | 2024 |
| KMM Sports Ltd | Wholesale & retail | 2025 |
| KN Awan Ltd | Manufacturing | 2022 |
| KN Son's Accountant Ltd | Professional & scientific | 2024 |
| KNB Contractors Ltd | Construction | 2020 |
| KNG Onyx Limited | Construction | 2018 |
| Knight Riders Secure Limited | Administrative & support | 2019 |
| Knight Young & Co. (UK) Ltd | Administrative & support | 2009 |
| Knight Young Asset Management Limited | Real estate | 2023 |
| Knight Young Holdings Limited | Financial services | 2018 |
| Knightsbridge Essentials Ltd | Manufacturing | 2025 |
| Knightsbridge Properties Group Ltd | Real estate | 2023 |
| Knightswell Crest Holdings Ltd | Professional & scientific | 2025 |
| KNK Logistics Ltd | Wholesale & retail | 2020 |
| Knock Social Ltd | Wholesale & retail | 2024 |
| Knot Bothered Limited | Financial services | 2018 |
| Know Your Dosh Limited | Information & communication | 2021 |
| Knowhowmart Ltd | Professional & scientific | 2010 |
| KNP Construction Limited | Construction | 2024 |
| KNR Building Solutions Ltd | Extraterritorial | 2024 |
| KNW Holdings Limited | Financial services | 2020 |
| KO Training Zone Limited | Education | 2017 |
| Kobe Estates Ltd | Real estate | 2026 |
| Kobra Cars Ltd | Transport & logistics | 2024 |
| Kochie Construction Ltd | Construction | 2019 |
| KOE Ltd | Information & communication | 2025 |
| Kofi Mukaase (UK) CIC | Hospitality | 2024 |
| Kofi Mukaase Limited | Hospitality | 2022 |
| Koftop Consultancy Ltd | Professional & scientific | 2021 |
| Kogane Ltd | Professional & scientific | 2016 |
| Koire Ltd | Wholesale & retail | 2026 |
| Kola Care Ltd | Health & social care | 2026 |
| Kolak Properties Ltd | Construction | 2022 |
| Kolbencore Limited | Wholesale & retail | 2026 |
| Kommit Infra Limited | Construction | 2024 |
| Kommit Solutions Limited | Information & communication | 2018 |
| Konar Enterprise Ltd | Transport & logistics | 2026 |
| Kondej Property Management Ltd | Real estate | 2023 |
| Konects Services Ltd | Administrative & support | 2018 |
| Konnex Global Ltd | Wholesale & retail | 2026 |
| Konse Care Services Limited | Administrative & support | 2025 |
| Koolair Hvac Ltd | Energy | 2023 |
| Kopernik Supermarket Ltd | Wholesale & retail | 2015 |
| Korean Glow Labs Ltd | Wholesale & retail | 2026 |
| Kosandra Ltd | Construction | 2024 |
| Kotli Cleaning Services Ltd | Administrative & support | 2024 |
| Kotson Construction Limited | Construction | 2020 |
| Kousine Limited | Hospitality | 2023 |
| Kozaklwa Ltd | Transport & logistics | 2017 |
| KP Building Contractors Limited | Administrative & support | 2017 |
| KP Construction and Interiors Limited | Construction | 2025 |
| KP Group London Ltd | Professional & scientific | 2020 |
| KP PV Services Limited | Professional & scientific | 2020 |
| KP Snacks Limited | Manufacturing | 2012 |
| KP Software Solutions Ltd | Information & communication | 2012 |
| KP Transport Solutions Ltd | Transport & logistics | 2026 |
| KPL Logistics Ltd | Transport & logistics | 2025 |
| KPU Property Ltd | Real estate | 2023 |
| Kpvl Solutions Ltd | Information & communication | 2021 |
| KR Flooring Limited | Construction | 2025 |
| Kranas Limited | Transport & logistics | 2019 |
| Kras Enterprises Limited | Other services | 2018 |
| Kratonomica Limited | Information & communication | 2026 |
| KRB Construct Plus Ltd | Construction | 2021 |
| KRB Group Holdings Limited | Wholesale & retail | 2024 |
| KRB Mobile Mechanic Limited | Wholesale & retail | 2019 |
| Kreeate AI Limited | Administrative & support | 2017 |
| Krest Graphics Limited | Manufacturing | 2013 |
| Kric Events Ltd | Hospitality | 2024 |
| Kris Building Services Ltd | Construction | 2023 |
| Kris Decorating Ltd | Construction | 2017 |
| Kris Group Construction Ltd | Construction | 2025 |
| Krish Courier Services Ltd | Transport & logistics | 2023 |
| Krishan Construction London Ltd | Construction | 2025 |
| Krishan Nirmal Properties Ltd | Real estate | 2022 |
| Krishav Properties Ltd | Real estate | 2022 |
| Krishka Ltd | Real estate | 2024 |
| Krishma Ltd | Wholesale & retail | 2026 |
| Krishman Ltd | Professional & scientific | 2023 |
| Kristaline Ltd | Manufacturing | 2022 |