| K Coleman Ltd | Construction | 2002 |
| K D R Plumbing Limited | Construction | 2003 |
| K D Roofing & Cladding Ltd | Construction | 2020 |
| K Dobbs Removals and Storage Ltd | Administrative & support | 2009 |
| K G Steel Ltd | Construction | 2017 |
| K L Investment Properties Ltd | Real estate | 2026 |
| K L Vickerage Ltd | Construction | 2009 |
| K O Roofing Services Limited | Construction | 2017 |
| K S Rathod & Company Limited | Professional & scientific | 2008 |
| K T M Care Ltd | Health & social care | 2009 |
| K Tanning Limited | Other services | 2026 |
| K&D Property Management Ltd | Real estate | 2021 |
| K-Dent Limited | Health & social care | 2017 |
| K. a. Newman Roofing Services Limited | Administrative & support | 2015 |
| K.B. Environmental Ltd | Financial services | 2017 |
| K.B.I. Limited | Financial services | 2002 |
| K.D. Electrix Ltd | Construction | 2014 |
| K.D.Radcliffe Limited | Wholesale & retail | 1936 |
| K.E.J Services Limited | Construction | 2025 |
| K.M.R. Photographic Services Limited | Professional & scientific | 1992 |
| K.P. Basavaraju Limited | Health & social care | 2014 |
| K.P. Evans & Co. Limited | Construction | 2000 |
| K.S. Electrical Engineering Ltd | Professional & scientific | 2010 |
| K.W. Engineering Services Limited | Professional & scientific | 2002 |
| K.W.T. Services Ltd. | Construction | 2003 |
| K2A Electronic Manufacturing Services Ltd | Wholesale & retail | 2023 |
| K2HR Limited | Administrative & support | 2018 |
| K2N Ltd. | Information & communication | 2003 |
| K85 Limited | Professional & scientific | 2024 |
| K87 Limited | Professional & scientific | 2022 |
| K9 Aquacare Ltd | Other services | 2018 |
| KA Rooney Limited | Professional & scientific | 2026 |
| Kaan Dikmen Consulting Limited | Administrative & support | 2018 |
| Kabesar Limited | Wholesale & retail | 2017 |
| Kachivia Ltd | Transport & logistics | 2025 |
| Kadaba Properties Ltd | Real estate | 2026 |
| Kadosh Touch Cleaning Ltd | Administrative & support | 2026 |
| Kafuiyawa Ltd | Health & social care | 2018 |
| Kagmed Ltd | Administrative & support | 2024 |
| Kaine Group Ltd | Financial services | 2025 |
| Kaiser Consulting Ltd | Information & communication | 2022 |
| Kaiserrushforth Limited | Manufacturing | 2004 |
| Kaiteen Ltd | Wholesale & retail | 2025 |
| Kaizen Consultancy Ltd | Education | 2007 |
| KAL WAS Here Ltd | Professional & scientific | 2014 |
| Kaladel Ltd | Manufacturing | 2006 |
| Kalaiarasu Ltd | Other services | 2013 |
| Kalari Federation of UK Ltd | Education | 2024 |
| Kale & Cumin Ltd | Hospitality | 2015 |
| Kalm Consulting Limited | Information & communication | 2016 |
| Kaltec Comfort Solutions Limited | Wholesale & retail | 2026 |
| KAM Lettings Limited | Real estate | 2012 |
| Kamalenoka Limited | Public administration | 2019 |
| Kamil Jasiukiewicz Ltd | Transport & logistics | 2013 |
| Kample Ventures Ltd | Real estate | 2024 |
| Kamsr Homes Ltd | Real estate | 2023 |
| Kamsr Ltd | Health & social care | 2019 |
| Kand London Ltd | Administrative & support | 2018 |
| Kandb Legacy Limited | Professional & scientific | 2025 |
| Kane Walker Ltd | Construction | 2014 |
| Kanex Trades Ltd | Other services | 2017 |
| Kangal Ltd | Wholesale & retail | 2022 |
| Kangi Surgery Limited | Real estate | 2011 |
| Kanmani Foods Ltd | Hospitality | 2024 |
| Kapital Asset Management Limited | Information & communication | 2016 |
| Kapolistic Limited | Hospitality | 2026 |
| Kapow Management Limited | Professional & scientific | 2013 |
| Kara PCO Car Ltd | Administrative & support | 2020 |
| Karael Properties Limited | Real estate | 2009 |
| Karam EN Ltd | Hospitality | 2022 |
| KARDESLER27 Limited | Hospitality | 2020 |
| Kare Tang Limited | Real estate | 2002 |
| Karen Peskett-Hall Limited | Professional & scientific | 2025 |
| Kargo Products Ltd | Administrative & support | 2017 |
| Kari KAY Company Ltd | Wholesale & retail | 2022 |
| Karittas Ltd | Health & social care | 2016 |
| Karma Beauty Limited | Other services | 2016 |
| Karmac Consulting Limited | Professional & scientific | 2020 |
| Karri Holdings Limited | Real estate | 2016 |
| Kartal Construction Limited | Real estate | 2021 |
| Karvin News Limited | Wholesale & retail | 2020 |
| Karvin Properties Ltd | Real estate | 2020 |
| Karvin Retail Limited | Wholesale & retail | 2018 |
| Kasi Properties Limited | Real estate | 2023 |
| Kasim Global Ltd | Wholesale & retail | 2025 |
| Kass Aviation Ltd | Professional & scientific | 2021 |
| Kass Drywall Ltd | Construction | 2021 |
| KAT Construction Ltd | Construction | 2020 |
| KAT Creativ Limited | Professional & scientific | 2001 |
| KAT Group Holdings Ltd | Financial services | 2024 |
| Kata Executive Consulting Limited | Professional & scientific | 2019 |
| Kate Thomas (Education Services) Limited | Education | 2013 |
| Katell (EA) Limited | Real estate | 2021 |
| Kates Garden Ltd | Health & social care | 2022 |
| Katgar Medical Services Ltd | Health & social care | 2023 |
| Kath Wright Consultant Limited | Professional & scientific | 2014 |
| Katona Creative Ltd | Professional & scientific | 2025 |
| Katsu Shack Ltd | Hospitality | 2026 |
| Kavana Flat Management Company Limited | Households | 1976 |
| Kawisara Productions Limited | Information & communication | 2025 |