| Kapu Builders Merchants Limited | Wholesale & retail | 2006 |
| Kara Atelier Limited | Health & social care | 2026 |
| Kara Kebab (Berks) Limited | Hospitality | 2020 |
| Kara Style Limited | Other services | 2021 |
| Karachifoodstreet Ltd | Hospitality | 2020 |
| Karacsan Ltd | Transport & logistics | 2017 |
| Karagil Ltd | Other services | 2025 |
| Karak Chaii Peascod Street Ltd | Construction | 2023 |
| Karak Enterprises Ltd | Hospitality | 2020 |
| Karar Enterprises Limited | Administrative & support | 2026 |
| Karat Haus Ltd | Wholesale & retail | 2025 |
| Karaya Letting and Management Ltd | Real estate | 2025 |
| Karbide Auto Services Limited | Wholesale & retail | 2024 |
| Karbide Autotechnik Ltd | Wholesale & retail | 2022 |
| Kare-N-Assist Ltd | Health & social care | 2026 |
| Kareema Shop Ltd | Health & social care | 2026 |
| Karencita & Marinero Ltd | Health & social care | 2018 |
| Kargo Express Ltd | Transport & logistics | 2025 |
| Kariba Conservation Programme Ltd | Extraterritorial | 2018 |
| Karizma AV Ltd | Administrative & support | 2021 |
| Karizma Roadshow London Ltd | Other services | 2011 |
| Karl Benz Motor Company Limited | Wholesale & retail | 2019 |
| Karl Goldman Art Consultancy Limited | Administrative & support | 2017 |
| Karline Transfers Ltd | Transport & logistics | 2022 |
| Karma Solutions Private Limited | Wholesale & retail | 2017 |
| Karman Teck Private Ltd | Wholesale & retail | 2025 |
| Karmatek Ltd | Administrative & support | 2018 |
| Karmi Kapital Management (UK) Ltd | Real estate | 2014 |
| Karnal Ltd | Transport & logistics | 2024 |
| Karpal Bassi & Co Limited | Professional & scientific | 2009 |
| Karpasa London Ltd | Wholesale & retail | 2020 |
| Kartar Advisory Ltd | Professional & scientific | 2018 |
| Kartech Ltd | Wholesale & retail | 2020 |
| Kartikay Joshi Ltd | Construction | 2021 |
| Karts of London Ltd | Administrative & support | 2023 |
| Karwan Restaurant Limited | Hospitality | 2017 |
| KAS Events Limited | Administrative & support | 2025 |
| KAS Info Solution Limited | Information & communication | 2013 |
| Kasa Eshna Limited | Professional & scientific | 2018 |
| Kasa Eshna Properties Limited | Real estate | 2019 |
| Kascade Solutions Limited | Information & communication | 2012 |
| Kashflow Software Limited | Information & communication | 2006 |
| Kashiara Estates Ltd | Real estate | 2022 |
| Kashmiri Karahi Slough Ltd | Hospitality | 2017 |
| Kashmiri Properties Ltd | Real estate | 2018 |
| Kashmiri Traders Ltd | Wholesale & retail | 2023 |
| Kasia Services Ltd | Administrative & support | 2023 |
| Kask Limited | Hospitality | 2025 |
| Kaspac Ltd | Health & social care | 2024 |
| KAT Service Limited | Health & social care | 2019 |
| Katana Gym Ltd | Arts & recreation | 2024 |
| Kate DE Lord Consultancy Ltd | Professional & scientific | 2023 |
| Katie Mcdonnell Limited | Other services | 2014 |
| Katy Lovell Ltd | Health & social care | 2014 |
| Kaur Health Ltd | Health & social care | 2024 |
| Kaur Homes Investment Ltd | Real estate | 2025 |
| Kaur Logistics Ltd | Transport & logistics | 2018 |
| Kaur Services Ltd | Transport & logistics | 2022 |
| Kauspar Limited | Real estate | 2021 |
| Kawal Builders Ltd | Construction | 2025 |
| Kawan Ltd | Transport & logistics | 2022 |
| Kay's Holdings Ltd | Health & social care | 2018 |
| Kayani & Sons Limited | Wholesale & retail | 2020 |
| Kayani Brothers Limited | Wholesale & retail | 2018 |
| Kayani Camp Slough C.I.C. | Education | 2018 |
| Kayani Plumbing Supplies Limited | Wholesale & retail | 2020 |
| Kayani's Food Emporium Limited | Wholesale & retail | 2018 |
| Kaybeedee Ltd | Real estate | 2025 |
| Kaye Care and Facility Services Ltd | Health & social care | 2018 |
| Kaye Group Limited | Health & social care | 2023 |
| Kaymetrics Ltd | Professional & scientific | 2013 |
| Kayrai Ltd | Administrative & support | 2026 |
| Kays Supermarket (PL) Ltd | Wholesale & retail | 2014 |
| Kayseria Ltd | Wholesale & retail | 2023 |
| Kaywood Developments Limited | Construction | 2018 |
| Kaywood Land Developments Limited | Construction | 2026 |
| Kayz Beauty Limited | Other services | 2023 |
| KAZ Fish Bar Ltd | Hospitality | 2011 |
| Kazalia Consulting Limited | Information & communication | 2018 |
| Kazalia Limited | Wholesale & retail | 2012 |
| Kazmi Limited | Information & communication | 2012 |
| Kazmi Logistics Ltd | Transport & logistics | 2026 |
| Kazzar Lighting Ltd | Wholesale & retail | 2020 |
| KB Investing Ltd | Real estate | 2026 |
| KBB Specialist's Ltd | Manufacturing | 2024 |
| KBC Renovations Ltd | Construction | 2025 |
| KBG Properties Ltd | Real estate | 2020 |
| KBH Meats Limited | Wholesale & retail | 2021 |
| KBK Investments Ltd | Real estate | 2006 |
| Kboevolutions Limited | Construction | 2026 |
| KC Management Solutions Limited | Construction | 2018 |
| KCG Heating Specialists Limited | Construction | 2022 |
| KD Infotech Ltd | Information & communication | 2017 |
| KD Transport Limited | Transport & logistics | 2021 |
| KD5 4LAM Limited | Health & social care | 2024 |
| KDG Hire Services Ltd | Construction | 2023 |
| KDS Services Enterprises Ltd | Wholesale & retail | 2022 |
| KDS Services London Ltd | Administrative & support | 2021 |
| KDS Transport & Logistics Ltd | Real estate | 2024 |
| KDZ Alam Ltd | Real estate | 2016 |