| Khaans Limited | Wholesale & retail | 2025 |
| Khaans Restaurant Ltd | Hospitality | 2018 |
| Khalas Solutions Ltd | Information & communication | 2018 |
| Khalida Medical Limited | Health & social care | 2022 |
| Khalique Properties Wakefield Limited | Real estate | 2025 |
| Khamun Limited | Information & communication | 2001 |
| Khani by ANA Khan Ltd | Wholesale & retail | 2026 |
| Khani Cosmetics Ltd | Wholesale & retail | 2026 |
| Khans (NW) Ltd | Hospitality | 2023 |
| Khans Curry Fast Food Limited | Hospitality | 2023 |
| Kharizma Ltd | Manufacturing | 2025 |
| Khboxing Ltd | Arts & recreation | 2025 |
| Kidzone Play Centre Limited | Arts & recreation | 2017 |
| Kies & Schiene Ltd | Wholesale & retail | 2008 |
| Kikky's Relish Ltd | Manufacturing | 2025 |
| Kilby Motor Group Ltd | Wholesale & retail | 2021 |
| Kilo Candy Co Ltd | Wholesale & retail | 2026 |
| Kindness & Co UK Ltd | Wholesale & retail | 2025 |
| King & Spink Ltd | Hospitality | 2026 |
| King Street Developments (Yorkshire) Limited | Construction | 2010 |
| King Street Solicitors LLP | | 2011 |
| Kingdom Educational Services Limited | Education | 2024 |
| Kingfisher Pharmacy Limited | Wholesale & retail | 1994 |
| Kinglake Developments Limited | Construction | 2011 |
| Kings GAP Trading Limited | Administrative & support | 2010 |
| Kingsbury Consulting Ltd | Professional & scientific | 2024 |
| Kingscote Manor Developments Ltd | Construction | 2018 |
| Kingsley Menswear Ltd | Wholesale & retail | 2019 |
| Kingston Construction (Leeds) Limited | Construction | 1996 |
| Kingsway-North Electrical Contractors Ltd | Construction | 2026 |
| Kingsway-North Ltd | Real estate | 2025 |
| Kingswells (Fashion Stores) Limited | Professional & scientific | 1977 |
| Kirk House (York) Management Ltd | Households | 2018 |
| Kirkby Grange Management Consultants Ltd | Professional & scientific | 2021 |
| Kirkgate Market Limited | Wholesale & retail | 2025 |
| Kirkgate Shop Limited | Wholesale & retail | 2025 |
| Kirkham Property and Maintenance Ltd | Real estate | 2020 |
| Kirkhamgate Villas Management Company Limited | Households | 2018 |
| Kirklees Estate Company Limited | Real estate | 1999 |
| Kirkman Court Limited | Transport & logistics | 1984 |
| Kirmond and Kirmond Ltd | Hospitality | 2021 |
| Kirsty Finn Design Limited | Professional & scientific | 2014 |
| Kismet Beds Ltd | Manufacturing | 2024 |
| Kismet Logistics UK Ltd | Transport & logistics | 2023 |
| Kitchen 83 Ltd | Hospitality | 2024 |
| Kitchen Essentials Ltd | Construction | 2025 |
| Kitn Archery&Chess Ltd | Arts & recreation | 2025 |
| Kiutel Limited | Administrative & support | 2006 |
| Kiwi Contracting Services Limited | Construction | 2020 |
| Kiwi Facilities Maintenance Limited | Manufacturing | 2011 |
| Kiwi Group Services Limited | Financial services | 2020 |
| Kiwi Properties and Lettings Limited | Real estate | 2021 |
| Kiwi Technologies Ltd | Information & communication | 2025 |
| KJ Electrical Installations Limited | Construction | 2021 |
| KJA Fisheries Ltd | Hospitality | 2024 |
| KJB Financial Ltd | Financial services | 2021 |
| KJR Waste Ltd | Water & waste | 2022 |
| KL Vehicle Repair & Service Centre Ltd | Wholesale & retail | 2018 |
| Kldn (Holdings) Limited | Financial services | 2020 |
| KLJ Projects Limited | Real estate | 2024 |
| KLM Electrical Supplies Ltd | Construction | 2024 |
| Klsb Consulting Ltd | Professional & scientific | 2023 |
| Klsb Investments Limited | Real estate | 2021 |
| KLY Consulting Ltd | Administrative & support | 2020 |
| KMP Consultancy Ltd | Professional & scientific | 2020 |
| KMP Law Limited | Financial services | 2008 |
| KMR HR Consulting Services Ltd | Professional & scientific | 2023 |
| KMS13 Limited | Real estate | 2019 |
| KN Property Management Ltd | Households | 2020 |
| Knackler & SON Ltd | Construction | 2020 |
| Knightssurveillance Limited | Professional & scientific | 2014 |
| Knockout Digital Marketing Limited | Professional & scientific | 2024 |
| Knot & BOW Ltd | Wholesale & retail | 2024 |
| Know Your Subject Limited | Information & communication | 2007 |
| Knowle Court Limited | Other services | 2005 |
| Knowles Family Partners LLP | | 2023 |
| Knox Power & Data Ltd | Construction | 2022 |
| Koenig-Ludwig Immobilien Ltd | Real estate | 2006 |
| Koenigin Luise Limited | Administrative & support | 2007 |
| Koko Hair Limited | Real estate | 2002 |
| Kolbeco. Wohnraumkonzepte Limited | Wholesale & retail | 2008 |
| Komponants Ltd | Wholesale & retail | 2024 |
| Konela Ltd | Transport & logistics | 2024 |
| Kongs Property Limited | Real estate | 2012 |
| Kooky Club Doncaster Ltd | Hospitality | 2015 |
| Kooky Club Wakefield Ltd | Hospitality | 2014 |
| Kool Kids Daycare Limited | Health & social care | 2005 |
| Kosmo Logistics Ltd | Transport & logistics | 2023 |
| Kowalski Properties Ltd | Real estate | 2024 |
| Kowloon Wakefield Ltd | Hospitality | 2021 |
| Kozomico Ltd | Wholesale & retail | 2023 |
| KP Life Science Consulting Ltd | Professional & scientific | 2026 |
| KPM International Limited | Professional & scientific | 2007 |
| KR Consultants Limited | Professional & scientific | 2025 |
| Kra:Ft Barbers Ltd | Other services | 2022 |
| Kra:Ft Media Services Ltd | Information & communication | 2022 |
| KRC Developments Limited | Real estate | 2012 |
| KRK Housing Ltd | Real estate | 2024 |
| KRN Developments Limited | Real estate | 1989 |
| Kroi Ltd | Construction | 2023 |