| Katcu Limited | Extraterritorial | 2024 |
| Kate Barton Design Limited | Wholesale & retail | 2020 |
| Kate Cullum & Associates Ltd | Professional & scientific | 2026 |
| Kate Does Content Ltd | Information & communication | 2026 |
| Kate Evans Design Ltd | Information & communication | 2022 |
| Kate Fitzpatrick Consulting Limited | Administrative & support | 2023 |
| Kate Gibson Events Limited | Other services | 2000 |
| Kate Happold Consulting Limited | Professional & scientific | 2017 |
| Kate Hopkins Sound Limited | Information & communication | 2013 |
| Kate Hordern Literary Agency Limited | Information & communication | 2015 |
| Kate Kieran Consulting Ltd | Professional & scientific | 2024 |
| Kate Laine-Toner Ltd | Information & communication | 2019 |
| Kate Logistics Ltd | Transport & logistics | 2021 |
| Kate Percy Limited | Extraterritorial | 2017 |
| Kate Rayment Architecture Ltd | Professional & scientific | 2023 |
| Kate Southerby Coaching Limited | Professional & scientific | 2024 |
| Kate Swatridge Consulting Limited | Professional & scientific | 2007 |
| Kate Willis Psychology Limited | Education | 2024 |
| Kate's Kitchen Catering Ltd | Hospitality | 2009 |
| Katena Consulting Ltd | Professional & scientific | 2024 |
| Kath Nichols Project Management Ltd | Professional & scientific | 2026 |
| Katherine Webb Ltd | Real estate | 2012 |
| Katherine West Limited | Arts & recreation | 2014 |
| Kathryn Ellis Limited | Professional & scientific | 2022 |
| Kathryn Simpson Consulting Ltd | Professional & scientific | 2015 |
| Kathtom Ltd | Real estate | 2026 |
| Kathy's Dancewear Limited | Wholesale & retail | 2007 |
| Kati's Hair & Beauty Ltd | Other services | 2026 |
| Katie Friedman & Associates Ltd | Professional & scientific | 2023 |
| Katie Fuge Childminding and Toddler Cafe Limited | Hospitality | 2012 |
| Katie Kerr Consultancy Limited | Administrative & support | 2023 |
| Katie Pearce Interiors Limited | Professional & scientific | 2023 |
| Katie's Food Co Ltd | Wholesale & retail | 2019 |
| Katinic Limited | Households | 2024 |
| Katka Investments Ltd | Real estate | 2020 |
| Katken PVT Ltd | Real estate | 2025 |
| Katmar Properties Limited | Administrative & support | 2012 |
| Katol Developments Ltd | Construction | 2022 |
| Katram LP | | 2012 |
| Katric Property Ltd | Real estate | 2021 |
| Kattumaram Ltd | Hospitality | 2020 |
| Katy Cronk Ltd | Professional & scientific | 2021 |
| Katy O'Kelly Limited | Professional & scientific | 2016 |
| Katy Taylor Limited | Professional & scientific | 2016 |
| Kaush Media Ltd | Professional & scientific | 2022 |
| Kavanagh Estates Limited | Real estate | 2003 |
| Kaveh Solar Ltd | Energy | 2022 |
| Kaventra Limited | Wholesale & retail | 2025 |
| Kavibeaute Ltd | Other services | 2025 |
| Kawan 4U Ltd | Wholesale & retail | 2024 |
| Kawan Traders Ltd | Wholesale & retail | 2022 |
| KAY KAY IT Consulting Ltd | Information & communication | 2022 |
| KAY Rogers Design Limited | Professional & scientific | 2025 |
| KAY Transport Holdings Limited | Transport & logistics | 2009 |
| KAY Transport Limited | Transport & logistics | 1991 |
| Kay's Jamaican Cuisine Ltd | Hospitality | 2023 |
| Kay's Temple Ltd | Real estate | 2021 |
| Kaya Building Ltd | Construction | 2019 |
| Kayaoglu Ltd | Hospitality | 2023 |
| Kaybee Property Limited | Real estate | 2026 |
| Kaycie Kyle Beauty Ltd | Other services | 2014 |
| Kaycie Kyle Salon Ltd | Other services | 2019 |
| Kayhan Consultancy Limited | Professional & scientific | 2025 |
| Kayliams PUB Ltd | Hospitality | 2024 |
| Kaypac Ventures Ltd | Wholesale & retail | 2019 |
| Kays Cleaning Limited | Administrative & support | 2009 |
| Kaysar Investments Limited | Real estate | 2021 |
| KAZ Hill Limited | Administrative & support | 2007 |
| Kaze Electrical Ltd | Construction | 2021 |
| Kazka Limited | Education | 2022 |
| Kazmi & Kazmi Corporate Services Limited | Professional & scientific | 2017 |
| KB Bricklaying Limited | Construction | 2005 |
| KB Event Equipment and Decor Ltd | Administrative & support | 2024 |
| KB Market Ltd | Wholesale & retail | 2022 |
| KB Mental Health Consultancy Limited | Health & social care | 2013 |
| KB Quick Cleans Limited | Administrative & support | 2025 |
| KB2 Consulting Engineers Limited | Professional & scientific | 2015 |
| KB2 Trustees Limited | Professional & scientific | 2015 |
| KB3 Bioenergy Limited | Water & waste | 2026 |
| Kbase Ltd | Information & communication | 2018 |
| Kbase-Connect Limited | Information & communication | 2000 |
| KBB Creation Ltd | Wholesale & retail | 2015 |
| KBB Enterprises Limited | Real estate | 2021 |
| KBB Properties Limited | Real estate | 2016 |
| KBE Contractors Ltd | Construction | 2026 |
| Kber Automation Ltd | Professional & scientific | 2024 |
| KBG Glass and Glazing Services Limited | Construction | 2017 |
| Kbid Services Ltd | Wholesale & retail | 2020 |
| KBK & Cars Ltd | Wholesale & retail | 2023 |
| KBL Property Services Limited | Real estate | 2024 |
| KBM Controls Limited | Manufacturing | 2019 |
| KBM Media Ltd | Manufacturing | 2014 |
| KBS Cook Ltd | Manufacturing | 2025 |
| KBS Dog Walk and Pet Sitting Ltd | Agriculture & fishing | 2023 |
| Kbsw Property Ltd | Real estate | 2026 |
| Kbts Fire Solutions Limited | Construction | 2026 |
| KC Construction Solutions Limited | Construction | 2025 |
| KC Drivers Direct Limited | Transport & logistics | 2017 |
| KC English Ltd | Administrative & support | 2024 |
| KC Events & Hospitality Ltd | Hospitality | 2026 |