| KES Construction (London) Limited | Construction | 2016 |
| Kestrel Technologies Limited | Manufacturing | 2006 |
| Keswick Mews (Residents) Management Company Limited | Households | 1977 |
| Keturah Ltd | Construction | 2016 |
| Kevin Café Epsom Ltd | Hospitality | 2023 |
| Kevin Roberts Music Limited | Professional & scientific | 2022 |
| Kevitek Ltd | Manufacturing | 2023 |
| Key Recruitment Solutions Ltd | Administrative & support | 2016 |
| Key Tours Limited | Administrative & support | 2010 |
| KEY2 Recoveries Limited | Administrative & support | 2002 |
| Keyboard Print Solutions Limited | Professional & scientific | 2002 |
| Keystone Comfort Solutions Ltd | Construction | 2023 |
| Keystone Tide Limited | Real estate | 2026 |
| Keytours International Ltd | Administrative & support | 2019 |
| Kezaa Ltd | Households | 2025 |
| Kfor Ltd | Construction | 2019 |
| Kgmkr Consulting Limited | Professional & scientific | 2022 |
| Kgmkr Management Limited | Other services | 2019 |
| Khbk Ltd | Financial services | 2020 |
| Kiam Pharmacy Ltd | Wholesale & retail | 2025 |
| Kibbu Mobility Limited | Transport & logistics | 2026 |
| Kiddy Crix Limited | Education | 2023 |
| Kidel Consulting Limited | Professional & scientific | 2021 |
| Kids on SET Limited | Administrative & support | 2024 |
| Kidscape | Health & social care | 2019 |
| Kidscape Trading Limited | Health & social care | 1986 |
| Kidspace Adventures Limited | Arts & recreation | 2004 |
| Kidspace Croydon Limited | Arts & recreation | 2006 |
| Kidspace Romford Limited | Arts & recreation | 2005 |
| Kielder Connections Limited | Information & communication | 1994 |
| Kieran’S KIT Quest Community Interest Company | Health & social care | 2024 |
| KIM Chiro Ltd | Administrative & support | 2016 |
| Kimpton Link Business Centre Management Company Limited | Households | 1986 |
| Kinard Limited | Real estate | 2004 |
| Kinder Scout Consultancy Limited | Professional & scientific | 2017 |
| Kinder Scout Properties Limited | Real estate | 2018 |
| Kinesiology Classes Limited | Education | 2003 |
| Kinetic Construction Services Ltd | Construction | 2026 |
| Kinetik Labs Limited | Manufacturing | 2012 |
| King Building Consultancy Limited | Professional & scientific | 2026 |
| Kingfisher Court (Ruxley Lane) Limited | Households | 2005 |
| Kingfisher Court (Wimbledon) Limited | Households | 2003 |
| Kingfisher Trade Ltd | Wholesale & retail | 2026 |
| Kingly Construction Limited | Real estate | 2017 |
| Kingly Limited | Construction | 2002 |
| Kingmaker Publishing Limited | Information & communication | 2018 |
| Kings Heating Ltd | Construction | 2025 |
| Kingsbridge Associates Limited | Professional & scientific | 2001 |
| Kingsdale Bridge Limited | Information & communication | 2014 |
| Kingsglade LLP | | 2009 |
| Kingsheath Investments Limited | Real estate | 2005 |
| Kingstonian Youth Dinton Field Limited | Arts & recreation | 2015 |
| Kingswood House School Trust Limited | Education | 1963 |
| Kingswood North Estate Company Ltd | Households | 2020 |
| Kinto Join Ltd | Administrative & support | 2013 |
| KIP Mcgrath Tuition Epsom LP | | 2024 |
| Kirby SPV Limited | Construction | 2022 |
| Kiri Enterprises Limited | Real estate | 2018 |
| Kiri Ltd | Wholesale & retail | 2019 |
| Kirks Domestics Limited | Other services | 2014 |
| Kirkup Build Ltd | Construction | 2013 |
| KIT & Caboodle Film and TV Ltd | Information & communication | 2023 |
| Kizal Properties LLP | | 2019 |
| KJ Civil & Structural Engineering Ltd | Administrative & support | 2017 |
| KJ Hewitson Ltd | Hospitality | 2024 |
| KJP Interior Design Ltd | Professional & scientific | 2019 |
| KK Group of Companies Limited | Wholesale & retail | 2025 |
| Klassik Property Ltd | Real estate | 2003 |
| Klein BUT Mighty Partners Limited | Real estate | 2025 |
| KLM Offshore Technical Services Limited | Professional & scientific | 2025 |
| KLN Partners Ltd | Health & social care | 2017 |
| KLS Accounting & Finance Ltd | Professional & scientific | 2025 |
| KME Creative Limited | Arts & recreation | 2025 |
| Kmkt Properties Limited | Real estate | 2025 |
| KMX Holdings Ltd | Real estate | 2024 |
| Knightsbridge Capital Solutions Ltd | Financial services | 2016 |
| Knightsbridge Care Limited | Health & social care | 2019 |
| Knightsbridge Construction Limited | Construction | 2016 |
| Knowledge One Ltd | Information & communication | 2012 |
| Knowles Management Ltd | Real estate | 2014 |
| Koenig UK Ltd | Professional & scientific | 2025 |
| Kohli Communications Limited | Professional & scientific | 2022 |
| Kokoro Young Ltd | Hospitality | 2020 |
| Konig REX UK Ltd | Professional & scientific | 2025 |
| Koniko Limited | Professional & scientific | 2009 |
| Koperek Groceries Ltd | Wholesale & retail | 2021 |
| Kora Coach Ltd | Information & communication | 2026 |
| Korean Society UK CIC | Other services | 2024 |
| Koto Card Limited | Financial services | 2018 |
| KP Technical Associates Ltd | Professional & scientific | 2023 |
| KPJ Limited | Real estate | 2022 |
| KPK Engineering Ltd | Construction | 2024 |
| KPN Services Limited | Wholesale & retail | 2009 |
| Kratos Sport International Limited | Education | 2025 |
| Krazy Keepers Limited | Wholesale & retail | 2017 |
| Krboss Limited | Wholesale & retail | 2024 |
| Kresa Ltd | Construction | 2014 |
| Krishj Enterprise Ltd | Real estate | 2018 |
| KRT Food Limited | Wholesale & retail | 2023 |
| Kruse Limited | Administrative & support | 2007 |