| KMP (Mitcham) Limited | Construction | 2018 |
| KMP (North Dulwich) Limited | Real estate | 2019 |
| KMP (RYE Lane) Limited | Real estate | 2005 |
| KMP (Stanmore) Ltd | Construction | 2025 |
| KMP (Streatham Hill) Limited | Construction | 2019 |
| KMP (Surrey Quays 2) Limited | Construction | 2020 |
| KMP (Surrey Quays) Limited | Construction | 2014 |
| KMP (Sutton) Ltd | Construction | 2018 |
| KMP (West Dulwich) Limited | Construction | 2015 |
| KMP (Whitechapel) Limited | Real estate | 2023 |
| KMP Fitness (Herne Bay) Ltd | Arts & recreation | 2018 |
| KMP Fitness (High Wycombe) Ltd | Arts & recreation | 2022 |
| KMP Fitness (Newport) Ltd | Arts & recreation | 2018 |
| KMP Fitness (Thanet) Ltd | Arts & recreation | 2019 |
| KMP Fitness (Whitstable) Limited | Arts & recreation | 2023 |
| KMP Fitness Limited | Arts & recreation | 2017 |
| KMP Holdco Ltd | Financial services | 2025 |
| KMP Products Ltd | Wholesale & retail | 2025 |
| KMP Propfin Limited | Financial services | 2018 |
| KMP Sons Ltd | Construction | 2026 |
| KN5791 Properties Ltd | Real estate | 2023 |
| Knighten Consulting Limited | Professional & scientific | 2019 |
| Knightsbridge Leisure Services Limited | Transport & logistics | 2009 |
| Knightway Properties Limited | Extraterritorial | 1989 |
| Knml Investment Ltd | Financial services | 2026 |
| Knockout Solutions Ltd | Professional & scientific | 2023 |
| Knowledge Above Standard Limited | Education | 2006 |
| Knpt Online Ltd | Arts & recreation | 2019 |
| KNR Property Management Ltd | Real estate | 2026 |
| KNS Chemists Limited | Wholesale & retail | 2003 |
| KNY Investment Ltd | Real estate | 2021 |
| KNY Stanmore Ltd | Real estate | 2021 |
| KO GIN Limited | Manufacturing | 2018 |
| Kobryner Ltd | Administrative & support | 2008 |
| Kofrimens Ltd | | 1989 |
| Koghitek Limited | Construction | 2015 |
| Kohlico Brands UK Limited | Manufacturing | 2006 |
| Kohlico World Foods Limited | Administrative & support | 2017 |
| KOM Technical Services Limited | Construction | 2017 |
| Komao Limited | Health & social care | 2018 |
| Konstructuk Ltd | Construction | 2016 |
| Kooij International Ltd | Information & communication | 2012 |
| Kookai Enterprises UK Limited | Financial services | 2017 |
| Kool Wines Limited | Wholesale & retail | 2010 |
| KOP Pavement Shopping Limited | Real estate | 1973 |
| Kosma Global Limited | Wholesale & retail | 2014 |
| KP21 Consultants Ltd | Professional & scientific | 2023 |
| KPH Couriers Limited | Transport & logistics | 2017 |
| KPJ Management Ltd | Real estate | 2025 |
| KPS Property Limited | Real estate | 2025 |
| Kpst Limited | Construction | 2025 |
| Krazy Events Ltd | Hospitality | 2024 |
| Krazy Nuts Limited | Wholesale & retail | 2023 |
| Kreation Technologies Limited | Information & communication | 2021 |
| Krest Limited | Administrative & support | 2016 |
| Krijuna Limited | Real estate | 2021 |
| Kris White Property Consultancy Limited | Professional & scientific | 2021 |
| Krishan Consulting Ltd | Professional & scientific | 2013 |
| Krishangpt Ltd | Arts & recreation | 2024 |
| Krishanthi Limited | Health & social care | 2023 |
| Krishay Properties Ltd | Real estate | 2014 |
| Krishna 77 Ltd | Information & communication | 2026 |
| Krishna Care Limited | Health & social care | 2026 |
| Krishna Enterprises (UK) Ltd | Other services | 2013 |
| Krishna Estates Limited | Real estate | 1997 |
| Krishna Express Brislington Limited | Wholesale & retail | 2024 |
| Krishna Sarees Limited | Wholesale & retail | 1999 |
| Krishnaa Construction Limited | Construction | 2020 |
| Kriya Properties Limited | Real estate | 2024 |
| Kriyash Ltd | Professional & scientific | 2014 |
| KRS Store Ltd | Wholesale & retail | 2025 |
| Krsna Homes Ltd | Real estate | 2022 |
| KRSW3 Limited | Real estate | 2017 |
| Krugerrland Limited | Wholesale & retail | 2007 |
| Krushnaraj Private Ltd | Wholesale & retail | 2025 |
| Krux London Limited | Real estate | 1997 |
| KS Properties NO.1 Limited | Real estate | 2026 |
| KS Sypien Limited | Construction | 2007 |
| KS31 Consulting Limited | Professional & scientific | 2024 |
| KSG Investments Limited | Professional & scientific | 2014 |
| KSG Properties Limited | Real estate | 2014 |
| KSK Practice Ltd | Health & social care | 2024 |
| KT Digital Ltd | Wholesale & retail | 2025 |
| Ktsh Capital Ltd | Real estate | 2026 |
| Kubabka Ltd | Manufacturing | 2025 |
| Kubewright Ltd | Information & communication | 2023 |
| Kudos Accounting Ltd | Professional & scientific | 2011 |
| Kudos Commerce Limited | Wholesale & retail | 2023 |
| Kudos Consult Ltd | Professional & scientific | 2019 |
| Kudos Group International Ltd | Administrative & support | 2024 |
| Kudos Kalibre Ltd | Administrative & support | 2023 |
| Kudos Real Estate Ltd | Real estate | 2020 |
| Kufa International Ltd | Professional & scientific | 2024 |
| Kuinua Limited | Information & communication | 2019 |
| Kujay Investments Limited | Real estate | 2020 |
| Kumar Electrix Limited | Construction | 2016 |
| Kumon Queensbury Study Centre LLP | | 2024 |
| Kush Beverages Limited | Manufacturing | 2025 |
| Kuwantom Technology to Close Limited | Information & communication | 2024 |
| Kwaprin Exports UK Ltd | Wholesale & retail | 2014 |