| Kcom Holdco 1 Limited | Financial services | 2019 |
| Kcom Holdco 2 Limited | Financial services | 2019 |
| Kcom Holdco 3 Limited | Financial services | 2019 |
| KCS Projects Limited | Wholesale & retail | 2012 |
| KD Food Express Limited | Hospitality | 2025 |
| KDB Offshore Limited | Professional & scientific | 2021 |
| KDC Hull Limited | Wholesale & retail | 2025 |
| KDS Hull Limited | Hospitality | 2024 |
| Kebab 67 Ltd | Hospitality | 2025 |
| Keeja Services Ltd | Construction | 2020 |
| Keelhaul Ltd | Information & communication | 2025 |
| Keelty Properties Ltd | Real estate | 2020 |
| Keep Derringham Green C.I.C. | Administrative & support | 2024 |
| Keff&Co Ltd | Professional & scientific | 2018 |
| Keith Carter Plastering (Yorkshire) Limited | Construction | 2010 |
| Keldgate House Management Limited | Households | 2004 |
| Kellys Sparkling Occasions Ltd | Wholesale & retail | 2025 |
| Kelmut Harmony Care Limited | Health & social care | 2025 |
| Kelsey House Doodles Limited | Agriculture & fishing | 2022 |
| Keltech Limited | Wholesale & retail | 2011 |
| Keltech Online Ltd | Wholesale & retail | 2016 |
| Kemley House Freehold Acquisition Company Limited | Financial services | 2020 |
| Kemley House Management (Hull) Limited | Households | 2004 |
| Kemp Builders Skirlaugh Limited | Construction | 2023 |
| Kemp Developments Limited | Construction | 1969 |
| Kemps Maritime Professional Services Ltd | Other services | 2023 |
| Kenby Pigs Limited | Agriculture & fishing | 2018 |
| Kendra Properties Ltd | Real estate | 2025 |
| Kenkypresh Limited | Health & social care | 2026 |
| Kensington Developments (UK) Limited | Real estate | 2006 |
| Kensington Holdings Limited | Professional & scientific | 1995 |
| Kensteen Leisure Ltd | Hospitality | 2023 |
| Kent (Hull) Limited | Transport & logistics | 2022 |
| Kent Concrete Linepump Ltd | Construction | 2023 |
| Kerah Signatures Ltd | Other services | 2025 |
| Kerekes Trans Ltd | Transport & logistics | 2018 |
| Kerikare Limited | Health & social care | 2014 |
| Kerry Wagner Mortgages Ltd | Financial services | 2021 |
| Kesen Ltd | Transport & logistics | 2016 |
| Keston Boilers Limited | Manufacturing | 1998 |
| Kestrelplan Limited | Financial services | 1989 |
| Kexgill (Bradford) Limited | Real estate | 2006 |
| Kexgill (Construction) Limited | Construction | 2004 |
| Kexgill (Cottingham) 2 Limited | Real estate | 2016 |
| Kexgill (Cottingham) Limited | Real estate | 2016 |
| Kexgill (Cranbrook) Limited | Real estate | 2018 |
| Kexgill (Durham) Limited | Real estate | 2002 |
| Kexgill (Hull) Limited | Real estate | 1995 |
| Kexgill (Liverpool) 2 Limited | Real estate | 2018 |
| Kexgill (Liverpool) Limited | Real estate | 1989 |
| Kexgill (Management) Limited | Real estate | 2016 |
| Kexgill (Middlesbrough) Limited | Real estate | 2001 |
| Kexgill (Nottingham) Limited | Real estate | 2001 |
| Kexgill (Preston) Limited | Real estate | 2001 |
| Kexgill (Salford) Limited | Real estate | 2004 |
| Kexgill (Stockton) Limited | Real estate | 2002 |
| Kexgill Limited | Real estate | 1978 |
| Key Engineering (Hull) Limited | Wholesale & retail | 2017 |
| Key Inspection Ltd | Professional & scientific | 2026 |
| Key Languages Ltd | Administrative & support | 2016 |
| Keyingham Digester Feedstock Limited | Agriculture & fishing | 2018 |
| Keyingham Power Limited | Energy | 2004 |
| Keyingham Road Curry Limited | Hospitality | 2020 |
| Keyingham Service Station Ltd | Wholesale & retail | 2011 |
| Keystone Construction (Leeds) Limited | Construction | 2021 |
| Keystone MIS Limited | Information & communication | 2011 |
| Kezza Hutch Properties Ltd Limited | Real estate | 2026 |
| KFM Co-Packer Ltd | Administrative & support | 2015 |
| KFM Holdings (Hull) Limited | Financial services | 2011 |
| KFM Property Ltd | Households | 2023 |
| KFM Training Limited | Administrative & support | 2014 |
| KG APC Limited | Professional & scientific | 2025 |
| Khaliqs Consultancy Limited | Wholesale & retail | 2022 |
| Khan's Holding Corporation Limited | Wholesale & retail | 2021 |
| Khan's Tandoori 1 Ltd | Hospitality | 2024 |
| Khanna Locums Ltd | Wholesale & retail | 2010 |
| Khebar Logistics Ltd | Transport & logistics | 2026 |
| Khedrubje Centre | Other services | 1992 |
| KHG Electrical Ltd | Construction | 2019 |
| KHG Property Ltd | Real estate | 2023 |
| KHL Trustees Limited | Professional & scientific | 2024 |
| KHS Project Management Services Ltd | Administrative & support | 2021 |
| Kibo Wellness Ltd | Wholesale & retail | 2025 |
| Kidzink Limited | Manufacturing | 2022 |
| KIF (Holdings) Limited | Professional & scientific | 2008 |
| KIJ Properties Limited | Real estate | 2025 |
| Kikin Ltd | Real estate | 2023 |
| Kiku 144 Ltd | Real estate | 2023 |
| Kikzaro Healthcare Ltd | Health & social care | 2015 |
| Kilcoy 1956 Limited | Extraterritorial | 2013 |
| Killer Look MG Ltd | Wholesale & retail | 2024 |
| Kilted Properties Limited | Real estate | 2015 |
| KIM Hire Limited | Real estate | 2002 |
| Kimberley DRY Cleaners Limited | Other services | 2005 |
| Kindheart Healthcare Ltd | Health & social care | 2018 |
| Kinera Ltd | Extraterritorial | 2012 |
| Kinetic Distribution Limited | Arts & recreation | 2023 |
| King Albert Chambers (Hull) Management Company Limited | Households | 2012 |
| King's Advisory Ltd | Health & social care | 2025 |
| Kingdec Finishes Ltd | Construction | 2025 |