| Karate Wales Ltd | Arts & recreation | 2015 |
| Karawan Court Residents Association Limited | Households | 1995 |
| Karaworld Ltd | Information & communication | 2025 |
| Karbon Store Ltd | Wholesale & retail | 2024 |
| Kardinal Hosting PC | | 2017 |
| Karera Ltd | Wholesale & retail | 2025 |
| Karg Holdings Ltd | Financial services | 2025 |
| Kariala Solutions Ltd | Wholesale & retail | 2021 |
| Kariba Resources Limited | Mining & quarrying | 2012 |
| Karibu Life Ltd | Financial services | 2020 |
| Karigar Ltd | Wholesale & retail | 2025 |
| Karigari Ltd | Wholesale & retail | 2025 |
| Karisa Creations Ltd | Other services | 2019 |
| Karl AKE Karlsson Ltd | Wholesale & retail | 2024 |
| Karl Gibson Logistics Ltd | Transport & logistics | 2025 |
| Karl Heinz Ottinger Ltd | Information & communication | 2021 |
| Karlando Engineering Limited | Professional & scientific | 2019 |
| Karlski Ltd | Other services | 2017 |
| Karm.Kunbus Ltd | Construction | 2018 |
| Karmatgranna Ltd | Professional & scientific | 2015 |
| Karmawaters Partnership Limited | Financial services | 2023 |
| Karnes Zmenity Area Ltd | Wholesale & retail | 2022 |
| Karol DEV Ltd | Information & communication | 2022 |
| Karpenko Ltd | Wholesale & retail | 2025 |
| Kartar Sees Property Group Ltd | Real estate | 2025 |
| Kartaza Services Ltd | Wholesale & retail | 2021 |
| KAS Services Group Ltd | Information & communication | 2025 |
| Kasaar Group Ltd | Transport & logistics | 2025 |
| Kasamma Solutions Ltd | Wholesale & retail | 2021 |
| Kase Telecom Ltd | Information & communication | 2016 |
| Kasgumma Ltd | Wholesale & retail | 2025 |
| Kash and Lash Limited | Wholesale & retail | 2025 |
| Kash Developments Ltd | Real estate | 2016 |
| Kashan Mart Ltd | Wholesale & retail | 2025 |
| Kashan Naqvi Limited | Wholesale & retail | 2025 |
| Kashif & Sons Limited | Other services | 2020 |
| Kashkoli Ltd | Real estate | 2020 |
| Kashlean Limited | Information & communication | 2014 |
| Kashluck Ltd | Professional & scientific | 2024 |
| Kasia's Hospitality Limited | Hospitality | 2011 |
| Kasmanis Limited | Information & communication | 2013 |
| Kaspars Grislis Limited | Construction | 2016 |
| Kaspas Devon Ltd | Hospitality | 2025 |
| Kassa Brickwork Ltd | Construction | 2026 |
| Kasslet Services Ltd | Administrative & support | 2024 |
| Kasstle Risk Solutions Ltd | Professional & scientific | 2026 |
| Kastel Solutions Ltd | Administrative & support | 2021 |
| Kasvine Ltd | Health & social care | 2022 |
| KAT 26 Venue Limited | Wholesale & retail | 2014 |
| KAT Global Limited | Professional & scientific | 2024 |
| KAT Property Management Ltd | Real estate | 2024 |
| KAT UK Enterprise Ltd | Wholesale & retail | 2024 |
| Kata Estates Ltd | Real estate | 2019 |
| Kata Group Ltd | Wholesale & retail | 2017 |
| Katalela Recruitment Ltd | Administrative & support | 2021 |
| Katalemo Services Ltd | Administrative & support | 2021 |
| Katalina Media Services Limited | Information & communication | 2009 |
| Katalis Limited | Professional & scientific | 2008 |
| Katalyst Productions Limited | Information & communication | 1999 |
| Kate Aird Limited | Other services | 2023 |
| Kate Walsh Consultancy Limited | Other services | 2024 |
| Kate's Kitchen Street Food Ltd | Hospitality | 2019 |
| Kath's Care Services Ltd | Health & social care | 2016 |
| Kathcal Industrial Electronic Repairs Limited | Manufacturing | 2012 |
| Katherine DE LA Riva Ltd | Wholesale & retail | 2025 |
| Katherine Richardson Limited | Health & social care | 2017 |
| Kathleenrooks Limited | Wholesale & retail | 2025 |
| Kathryn Shears Financial Planning Limited | Financial services | 2022 |
| Katie Alice Hairdressing Ltd | Other services | 2019 |
| Katrada Ltd | Wholesale & retail | 2025 |
| Katrin Florence Ltd | Wholesale & retail | 2014 |
| Katrina Hammond Villas Limited | Real estate | 2005 |
| Kats Claws Limited | Other services | 2004 |
| Katw Ltd | Hospitality | 2018 |
| Kaushik H&L Ltd | Hospitality | 2025 |
| Kausik Madhu Medical Services Ltd | Health & social care | 2012 |
| Kaustubh Vasant Pandav Ltd | Financial services | 2023 |
| Kavero Limited | Wholesale & retail | 2025 |
| Kavyan Limited | Real estate | 2019 |
| Kawaiitcg Ltd | Wholesale & retail | 2020 |
| Kawaymigi Ltd | Wholesale & retail | 2025 |
| Kawing ( Nelson ) Ltd | Hospitality | 2023 |
| Kawtar Ltd | Education | 2025 |
| Kaxtan Investments Limited | Wholesale & retail | 2014 |
| KAY and Sons Lettings Limited | Real estate | 2019 |
| KAY Home Limited | Real estate | 2018 |
| KAY Home Properties Ltd | Construction | 2025 |
| Kaya B Investments Ltd | Real estate | 2024 |
| Kaya Brothers Limited | Wholesale & retail | 2014 |
| Kaya Cafe Ltd | Extraterritorial | 2022 |
| Kayakita Limited | Administrative & support | 2025 |
| Kayan College for International Security and Legal Sciences Ltd | Professional & scientific | 2025 |
| Kayber Court Investments Limited | Real estate | 2013 |
| Kaybrook Developments Limited | Professional & scientific | 1964 |
| Kaydazzy Limited | Construction | 2018 |
| Kayer Construction Ltd | Construction | 2020 |
| Kayes (Wholesale) Limited | Wholesale & retail | 1998 |
| Kayes Maids Ltd | Administrative & support | 2018 |
| Kaygate Limited | | 1974 |
| Kaykay Global Ltd | Wholesale & retail | 2025 |