| KAM Leisurewear Limited | Real estate | 1984 |
| KAM Property Ltd | Real estate | 2026 |
| KAM Training Enterprises Limited | Education | 2023 |
| Kamal's Fisheries Ltd | Hospitality | 2024 |
| Kamare Holdings Limited | Financial services | 2026 |
| Kamboh Prime Limited | Wholesale & retail | 2024 |
| Kamer Construction Ltd | Construction | 2020 |
| Kamilo Limited | Wholesale & retail | 2019 |
| Kaminski Lord Ltd | Professional & scientific | 2024 |
| Kampri Ltd | Health & social care | 2010 |
| Kampwell Limited | Wholesale & retail | 2018 |
| Kamran Taxi Services Ltd | Transport & logistics | 2026 |
| Kams & Sams Ltd | Hospitality | 2025 |
| Kanayon and Sons Ltd | Wholesale & retail | 2021 |
| Kandi London Ltd | Administrative & support | 2017 |
| Kandoo Events Ltd | Arts & recreation | 2015 |
| Kane Services Limited | Construction | 2025 |
| Kangley Associates Limited | Real estate | 2010 |
| Kanidae Limited | Hospitality | 2010 |
| Kantom Properties Limited | Real estate | 2013 |
| Kanubi Investment Limited | Health & social care | 2011 |
| KAO Beauty Academy Ltd | Education | 2023 |
| Kaolakaz Ltd | Other services | 2018 |
| Kapoor SO Trading Limited | Health & social care | 2024 |
| Kappatron Ltd | Information & communication | 2013 |
| KAR Chuen Fong Ltd | Health & social care | 2025 |
| KAR Groups of Company Limited | Wholesale & retail | 2025 |
| Karacen Limited | Other services | 2019 |
| Karak Chaii Sheff Limited | Hospitality | 2025 |
| Karam Al-Madina Ltd | Hospitality | 2023 |
| Karan Limited | Hospitality | 2025 |
| Karat World Gold & Jewellery Ltd | Wholesale & retail | 2023 |
| Kardash Holdings Limited | Administrative & support | 2021 |
| Kardin Food Ltd | Hospitality | 2025 |
| Karebridge Limited | Health & social care | 2024 |
| Karimi UK Limited | Professional & scientific | 2006 |
| Karina LAX Ltd | Professional & scientific | 2024 |
| Karinamaria Limited | Transport & logistics | 2025 |
| Karl Benz Kitchens and Interiors Ltd. | Wholesale & retail | 2012 |
| Karl Property Limited | Construction | 2026 |
| Karma Competitions Limited | Arts & recreation | 2025 |
| Karola Aesthetics Academy and Cosmetic Clinic Ltd | Other services | 2023 |
| Karper Limited | Wholesale & retail | 2016 |
| Karrm Holiday Lettings Ltd | Hospitality | 2020 |
| Karvic Ltd | Wholesale & retail | 2025 |
| KAS Accountancy Ltd | Professional & scientific | 2017 |
| KAS Total Solutions Ltd | Professional & scientific | 2017 |
| Kasa Escort Agency Limited | Other services | 2025 |
| Kascaid Limited | Professional & scientific | 2018 |
| Kash Legal Services Limited | Professional & scientific | 2020 |
| Kashmir Food & Grill Ltd | Hospitality | 2026 |
| Kasim Pharma Ltd | Wholesale & retail | 2022 |
| Kastoe Limited | Information & communication | 2025 |
| Kata Developments Ltd | Construction | 2013 |
| Katalysts Limited | Professional & scientific | 2008 |
| Kate Armes Ltd | Professional & scientific | 2020 |
| Kate Beaumont Limited | Other services | 2012 |
| Kate Camfield Limited | Professional & scientific | 2023 |
| Kate Campbell Fitness Ltd | Arts & recreation | 2018 |
| Kate Haldane Management Limited | Information & communication | 2024 |
| Kate Hill Consulting Ltd | Arts & recreation | 2011 |
| Kate Sandivasci Limited | Administrative & support | 2022 |
| Kate's Bush Ltd | Professional & scientific | 2025 |
| Katerina Perez Ltd | Arts & recreation | 2014 |
| Katesuiter Ltd | Professional & scientific | 2017 |
| Katherine Consulting Limited | Professional & scientific | 2023 |
| Katia Tastagh Design Ltd | Professional & scientific | 2026 |
| Katie Rogers Coaching Ltd | Education | 2024 |
| Katimavik Ltd | Real estate | 2018 |
| KATRIN2 Ltd | Transport & logistics | 2017 |
| Kats Mother Media Ltd | Information & communication | 2024 |
| Katsuo Udon Company Limited | Hospitality | 2023 |
| Katy Robinson Fitness Fusion Ltd | Arts & recreation | 2015 |
| Kavanagh Health Care Limited | Health & social care | 2008 |
| Kavanagh Holdings Limited | Real estate | 2022 |
| Kavita Varu Ltd | Administrative & support | 2015 |
| KAVORA8 Limited | Wholesale & retail | 2026 |
| KAY Health Care Service Ltd | Health & social care | 2023 |
| KAY Pizza Limited | Hospitality | 2015 |
| KAY Property Holdings Limited | Real estate | 2018 |
| Kay's Alfresco Kaytering Limited | Hospitality | 2025 |
| Kay's Property Yorkshire Limited | Real estate | 2025 |
| Kaya Fish & Chips Ltd | Extraterritorial | 2014 |
| Kaye Littlewood Limited | Administrative & support | 2005 |
| Kaye-Dee Marking Solutions Limited | Manufacturing | 1970 |
| Kayes Stores Ltd | Wholesale & retail | 2022 |
| Kayord Ltd | Transport & logistics | 2020 |
| Kaytico Limited | Hospitality | 2015 |
| Kazmierczak Investments Ltd | Real estate | 2026 |
| KB Engineering & Manufacturing Management Limited | Professional & scientific | 2012 |
| KB Homes Limited | Construction | 2016 |
| KB Media Evolution Ltd | Administrative & support | 2024 |
| KB Paving & Landscaping Ltd | Administrative & support | 2026 |
| KB Physio Limited | Health & social care | 2022 |
| KB Plastering and Home Improvements Ltd | Construction | 2024 |
| KB Plumbing Heating & GAS Services Limited | Construction | 2015 |
| Kbemg Services Ltd | Health & social care | 2006 |
| KBH Installations Limited | Construction | 2009 |
| KBN Accounting Services Ltd | Information & communication | 2011 |
| Kbneurophys Limited | Health & social care | 2018 |