| K and Z Medical Legal Limited | Health & social care | 2017 |
| K Corner Ltd | Wholesale & retail | 2019 |
| K F Chung Ltd | Health & social care | 2015 |
| K Garage Limited | Wholesale & retail | 2019 |
| K J Consulting Engineers Ltd | Professional & scientific | 2017 |
| K Recruitment Services Ltd | Administrative & support | 2025 |
| K S N Consulting Limited | Professional & scientific | 2011 |
| K&D Partners Ltd | Other services | 2013 |
| K&R Locksmiths and Windows Limited | Other services | 2024 |
| K&Todorovs Construction Ltd | Other services | 2019 |
| K, S and F Corp Limited | Real estate | 2026 |
| K.C. & I.K. Sethia (1944) Ltd | Real estate | 2017 |
| K.M Street Broadcast Services Ltd | Information & communication | 2022 |
| K.P. Cleaning Ltd | Administrative & support | 2005 |
| K1 Barbers (Surrey) Limited | Other services | 2016 |
| K2 Graphics Ltd | Manufacturing | 2023 |
| Kaas Systems Limited | Professional & scientific | 2023 |
| Kadosh Healthcare Limited | Health & social care | 2025 |
| Kaeott Global Limited | Wholesale & retail | 2021 |
| KAF Care Ltd | Health & social care | 2022 |
| Kagoboon Ltd | Wholesale & retail | 2025 |
| KAI Investments Limited | Real estate | 2015 |
| KAI Koduppoam Ltd | Education | 2022 |
| Kaiaandjaja Attire Limited | Wholesale & retail | 2020 |
| Kaival Food and Wine Limited | Wholesale & retail | 2025 |
| Kala International Limited | Wholesale & retail | 2018 |
| Kalay Limited | Professional & scientific | 2021 |
| Kalev&Co Ltd | Construction | 2021 |
| Kali Illam Ltd | Real estate | 2025 |
| Kalypso Talent Ltd | Professional & scientific | 2026 |
| Kamali Kitchen Ltd | Hospitality | 2024 |
| Kamath Property Ltd | Real estate | 2023 |
| Kambabu Ltd Ltd | Health & social care | 2020 |
| Kami Studio Private Limited | Professional & scientific | 2026 |
| Kamini Ltd | Other services | 2005 |
| Kamla Property's Ltd | Real estate | 2023 |
| KAMS.STORE786 Ltd | Wholesale & retail | 2026 |
| KAN Craft Solutions Ltd | Construction | 2019 |
| Kanaga Services Ltd | Wholesale & retail | 2018 |
| Kanda Foods Ltd | Hospitality | 2026 |
| Kandaz Autos Ltd | Other services | 2009 |
| Kandermond Ltd | Professional & scientific | 2026 |
| Kane Construction Services Limited | Construction | 2003 |
| Kane Industries Ltd | Financial services | 2023 |
| Kane Property Investments Ltd | Real estate | 2023 |
| Kanine Kartel Ltd | Other services | 2020 |
| Kanita Property Investments Ltd | Households | 2015 |
| Kannima Hospitality Limited | Health & social care | 2025 |
| Kansa Associates Limited | Professional & scientific | 2007 |
| Kanta Consulting Limited | Wholesale & retail | 2012 |
| Kanza Services Limited | Professional & scientific | 2025 |
| Kapiraj Ltd | Wholesale & retail | 2025 |
| Karen Bates Occupational Therapy Limited | Health & social care | 2011 |
| Karen the Travel Agent Ltd | Administrative & support | 2025 |
| Karghatra PVT Ltd | Wholesale & retail | 2022 |
| Karim Consulting Ltd | Information & communication | 2014 |
| Karla Media Productions Limited | Information & communication | 2012 |
| Karmajeet Investment Ltd | Real estate | 2024 |
| Karthikeya Engineers Limited | Construction | 2013 |
| KAS Construction (SW) Limited | Administrative & support | 2012 |
| KAS Property Group Ltd | Real estate | 2024 |
| Kasawoo Ltd | Professional & scientific | 2020 |
| Kate's Cleaning Ltd | Other services | 2016 |
| Kavish Technologies Ltd | Information & communication | 2015 |
| Kavlon Consulting Limited | Information & communication | 2014 |
| Kavsun Properties Limited | Real estate | 2020 |
| Kawatkar UK Limited | Information & communication | 2026 |
| KAY DEE Estates Limited | Real estate | 2022 |
| KAY Fibre Ltd | Construction | 2024 |
| Kaynar Catering Ltd | Hospitality | 2018 |
| Kaysha Properties Ltd | Real estate | 2018 |
| KB Cars Limited | Transport & logistics | 2015 |
| KBK Associates Ltd | Real estate | 2020 |
| Kccarpentry&Joinery Ltd | Manufacturing | 2025 |
| KCW Consulting Ltd | Professional & scientific | 2024 |
| KCW Interior Solutions Ltd | Construction | 2025 |
| KD Global Developments Ltd | Real estate | 2020 |
| Kebbells Limited | Hospitality | 2019 |
| KEEN2GO Living Ltd | Health & social care | 2025 |
| Keens Construction Limited | Construction | 2022 |
| Keepers Court Management Company Limited | Households | 1988 |
| Keeps Printing Limited | Manufacturing | 2026 |
| Keiman Holdings Ltd | Real estate | 2024 |
| Keiman Homes Ltd | Wholesale & retail | 2025 |
| Kellaway Services Ltd | Professional & scientific | 2021 |
| Kelvic Security UK Ltd | Health & social care | 2016 |
| Kemic Consultant Ltd | Professional & scientific | 2021 |
| Kemstar Services Ltd | Construction | 2024 |
| KEN Consulting Limited | Information & communication | 2012 |
| Kennedyregal Limited | Hospitality | 2021 |
| Kentish Pizzeria Limited | Hospitality | 2023 |
| KEO Yang UK Ltd | Wholesale & retail | 2015 |
| Kepos London Ltd | Wholesale & retail | 2025 |
| Kepra Ltd | Administrative & support | 2025 |
| Kera South Indian Foods Limited | Hospitality | 2017 |
| Kerity Limited | Professional & scientific | 2005 |
| Kernow Energy Limited | Professional & scientific | 2005 |
| Kerr House Management Limited | Households | 1971 |
| Kerry’S K9S Ltd | Other services | 2026 |
| Kesl Surrey Ltd | Construction | 2025 |