| Kinaston Associates Limited | Administrative & support | 2000 |
| Kinch Robinson Limited | Education | 2009 |
| Kind Care House Ltd | Health & social care | 2024 |
| Kinder Housing Ltd | Real estate | 2023 |
| Kindle House Productions Ltd | Information & communication | 2025 |
| Kindoo Discovery Limited | Information & communication | 2026 |
| Kindred Bricks Limited | Real estate | 2020 |
| Kindred Home Care Services Ltd | Health & social care | 2025 |
| Kindred Spirits Theatre Company Limited | Arts & recreation | 2023 |
| Kinematic Media Ltd | Information & communication | 2010 |
| Kinematograph Ltd. | Information & communication | 2017 |
| Kinetic Carpentry & Joinery Limited | Construction | 2014 |
| Kinetic Clinics Limited | Health & social care | 2014 |
| Kinetic Design Services Ltd | Administrative & support | 2026 |
| Kinetic Solutions Group Limited | Financial services | 2019 |
| Kinex Infrastructures Ltd | Construction | 2025 |
| King Edward VII School Swimming Pool Trust | Arts & recreation | 1992 |
| King Edwin's Court Property Company Limited | Households | 1967 |
| King HR Advisory Ltd | Administrative & support | 2026 |
| Kingdom Analytic | Professional & scientific | 2022 |
| Kingdom Quality Foods Ltd | Manufacturing | 2013 |
| Kingdom Reliable Ltd | Wholesale & retail | 2026 |
| Kingdom Renovations & Developments Ltd | Construction | 2021 |
| Kingdom Strength Ltd | Wholesale & retail | 2020 |
| Kingfield Assisted Living Limited | Health & social care | 2020 |
| Kingfield Care Group Limited | Health & social care | 2014 |
| Kingfield Care Home Limited | Health & social care | 2010 |
| Kingfield Foundations Limited | Health & social care | 2014 |
| Kingfield Property Holdings Limited | Other services | 2025 |
| Kingfield Supported Living Ltd | Health & social care | 2014 |
| Kingfisher Auctions Limited | Wholesale & retail | 2019 |
| Kingfisher Fine Art Limited | Wholesale & retail | 1946 |
| Kingfisher Health Care Services Limited | Health & social care | 2001 |
| Kingkraft Limited | Manufacturing | 1984 |
| Kingpin Plumbing, Heating & Building Services Limited | Construction | 1996 |
| Kings Active Foundation | Education | 2004 |
| Kings American Sweets Ltd | Wholesale & retail | 2025 |
| Kings Mill House Management Company Limited | Households | 1995 |
| Kings Properties Services Ltd | Real estate | 2017 |
| Kings Tree Security Consultancy Ltd | Administrative & support | 2025 |
| Kingscrest Services Ltd | Professional & scientific | 2015 |
| Kingscrest Solutions Ltd. | Professional & scientific | 2007 |
| Kingsit Services Ltd | Wholesale & retail | 2024 |
| Kingsley Developments (Scarborough) Limited | Real estate | 2020 |
| Kingsley Logistics Consulting Ltd | Professional & scientific | 2020 |
| Kingsley Properties (Scarborough) Limited | Real estate | 2020 |
| Kingsley Road Harrogate Management Company Limited | Households | 2019 |
| Kingslodge Commercial Limited | Real estate | 2003 |
| Kingslodge Holdings Limited | Financial services | 2004 |
| Kingslodge Residential Limited | Real estate | 2003 |
| Kingsmaid Luxe Clean Limited | Administrative & support | 2025 |
| Kingston Consulting (Worksop) Limited | Professional & scientific | 2025 |
| Kingston Holdings (Worksop) Limited | Financial services | 2025 |
| Kinlin Holdings Limited | Financial services | 2025 |
| Kinloch Engineering Limited | Construction | 1980 |
| Kinphonic Ltd | Information & communication | 2014 |
| Kinpin Properties Ltd | Real estate | 2023 |
| Kinspeed Holdings Ltd | Financial services | 2017 |
| Kinspeed Limited | Information & communication | 1985 |
| Kinvera Care (WL) Limited | Health & social care | 2026 |
| Kinvera Holdings Limited | Health & social care | 2014 |
| Kinvic Cleaning Ltd | Administrative & support | 2026 |
| Kipling's Hair Systems Limited | Other services | 2025 |
| Kira 2 Ltd | Real estate | 2020 |
| Kira 49 Ltd | Real estate | 2022 |
| Kira 49W Ltd | Real estate | 2022 |
| Kira O Holdings Limited | Arts & recreation | 2021 |
| KIRA1 Ltd | Real estate | 2019 |
| Kirada Ltd | Real estate | 2016 |
| Kirby Communications Limited | Extraterritorial | 2009 |
| Kirby Electrical Limited | Manufacturing | 1972 |
| Kirby Facilities Limited | Extraterritorial | 2015 |
| Kirby Fire Limited | Extraterritorial | 2009 |
| Kirby Group Ltd | Extraterritorial | 2009 |
| Kirby Home Security Limited | Extraterritorial | 2014 |
| Kirby Security (UK) Limited | Construction | 1984 |
| Kirby Security Limited | Extraterritorial | 2009 |
| Kirby-Borrell Ltd | Wholesale & retail | 2024 |
| Kirk Jackson Ltd | Construction | 2015 |
| Kirk Mews Limited | Hospitality | 2022 |
| Kirkby Investment Group Ltd | Real estate | 2021 |
| Kirkby Tech Limited | Information & communication | 2016 |
| Kirkcaldy Consulting Limited | Professional & scientific | 2009 |
| Kirkpro Electronics Limited | Wholesale & retail | 2025 |
| Kirsten Heywood Limited | Professional & scientific | 2026 |
| Kirthar Limited | Public administration | 2023 |
| Kishmeem Enterprises Limited | Real estate | 1996 |
| Kismet Care Collective Ltd | Health & social care | 2025 |
| Kiss House Ltd | Construction | 2017 |
| Kissanut Productions Limited | Information & communication | 2010 |
| Kissling Marketing Limited | Wholesale & retail | 2005 |
| Kiswa Products Ltd | Wholesale & retail | 2025 |
| Kitbags & Lockers Ltd | Wholesale & retail | 2019 |
| Kitchen Appliance Warehouse Ltd | Wholesale & retail | 1999 |
| Kitchen Connections Limited | Manufacturing | 2015 |
| Kitchen Creation Designs Limited | Extraterritorial | 2012 |
| Kitchen Gizmos UK Ltd | Wholesale & retail | 2021 |
| Kitchen Radio Live CIC | Information & communication | 2025 |
| Kitchen Railways Limited | Manufacturing | 2019 |
| Kitchen S10 Ltd | Hospitality | 2022 |