| Kenton Bathrooms Ltd | Construction | 2024 |
| Kenton Karpets Ltd | Wholesale & retail | 2007 |
| Kenton Park Community Association | Education | 2019 |
| Kenton Road 1959 Limited | Extraterritorial | 2014 |
| Kents NE3 Limited | Hospitality | 2017 |
| Kepfa Ltd | Real estate | 2025 |
| Kepier Consulting Limited | Real estate | 2021 |
| Kepler Property Limited | Real estate | 2021 |
| Kerala Basket Limited | Wholesale & retail | 2025 |
| Kerala Basket Wholesale Limited | Wholesale & retail | 2026 |
| Kerala Kafe Ltd | Manufacturing | 2023 |
| Kerato Limited | Professional & scientific | 2023 |
| Kerbside Kids Ltd | Hospitality | 2025 |
| Kerneslawe Developments Limited | Wholesale & retail | 2013 |
| Kerr's Heating Ltd | Construction | 2021 |
| Kerracre Limited | Real estate | 1982 |
| Kerrylynncare Ltd | Health & social care | 2020 |
| Kesanitar Ltd | Wholesale & retail | 2024 |
| Keshav Inc Limited | Administrative & support | 2016 |
| Kesson Consulting Limited | Professional & scientific | 2021 |
| Kestrel Truck Services Limited | Wholesale & retail | 2001 |
| KEV Price Ltd | Information & communication | 2025 |
| Kevin Gibson Photography Ltd | Information & communication | 2012 |
| Kevin Jackson Limited | Professional & scientific | 2024 |
| Kevin Kevin Limited | Administrative & support | 2023 |
| Kevin Klean Limited | Other services | 2012 |
| Kevin Richardson Bespoke Ltd | Construction | 2013 |
| KEW Limited | Administrative & support | 2015 |
| Kewen School of Music Ltd | Education | 2024 |
| Key Health Ltd | Wholesale & retail | 2016 |
| Key Housing (North East) Ltd | Real estate | 2017 |
| Key Ingredient (NE) Ltd | Hospitality | 2020 |
| Key Stone (NE) Limited | Construction | 2014 |
| Key-Tech International Limited | Professional & scientific | 2001 |
| Key-Tech International Trustee Limited | Professional & scientific | 2022 |
| Keya Food Limited | Hospitality | 2015 |
| Keyes Capital Limited | Professional & scientific | 2026 |
| Keyes Eyecare Holdings Limited | Wholesale & retail | 2025 |
| Keyes Limited | Real estate | 2002 |
| Keymer Capital LP | | 2015 |
| Keyora Realty Ltd | Real estate | 2025 |
| Keyspring Care Ltd | Health & social care | 2021 |
| Keyspring Ltd | Professional & scientific | 2018 |
| Keystone Developments (NE) Limited | Construction | 2018 |
| Keystone Education Holdings Limited | Financial services | 2023 |
| Keystone Refers Ltd | Professional & scientific | 2025 |
| Keystone Vision Ltd | Professional & scientific | 2024 |
| Keyvest Limited | Real estate | 2025 |
| KF Premium Ltd | Wholesale & retail | 2020 |
| KFM Properties NE Ltd | Real estate | 2017 |
| Kggbeatsprods Limited | Information & communication | 2025 |
| Kgjr Properties Limited | Real estate | 2025 |
| KGL Maintenance Ltd | Construction | 2017 |
| KH Equestrian Ltd | Agriculture & fishing | 2020 |
| KH Premium Travel Ltd | Administrative & support | 2011 |
| KH Wade Logistics Ltd | Transport & logistics | 2025 |
| Khadija's Cakes Ltd | Hospitality | 2026 |
| Khadim Investment Group Ltd | Real estate | 2024 |
| Khalidfol Ltd | Other services | 2015 |
| Khalifa Urology Ltd | Health & social care | 2024 |
| Khaliq Express Ltd | Transport & logistics | 2019 |
| Khalique Services Ltd | Transport & logistics | 2025 |
| Khan Accountants Ltd | Professional & scientific | 2020 |
| Khanelbadawey Ltd | Health & social care | 2021 |
| Khanemize Tyres Ltd | Wholesale & retail | 2022 |
| Khanli Property Management Ltd | Real estate | 2025 |
| Khans Cuisine Ltd | Hospitality | 2018 |
| Khans Hospitality Group Ltd | Hospitality | 2025 |
| Khasa Restaurant Ltd | Hospitality | 2019 |
| Khayam&Co Ltd | Administrative & support | 2025 |
| Khazra Cooling Solution Ltd | Manufacturing | 2024 |
| Khc-Consulting Ltd | Professional & scientific | 2009 |
| Khdc Ltd | Health & social care | 2023 |
| Kheops Construction Ltd | Construction | 2018 |
| Khidmat Care Services Ltd | Health & social care | 2022 |
| Khindria Properties Ltd | Real estate | 2025 |
| Khnd Limited | Transport & logistics | 2024 |
| Khob Khun Gosforth Ltd | Hospitality | 2025 |
| Khodary Properties Limited | Real estate | 2024 |
| Khomas Hochland Holdings Group Limited | Financial services | 2023 |
| Khonic Limited | Health & social care | 2024 |
| KHQ Associates Limited | Professional & scientific | 2019 |
| Khunbiescouture Ltd | Manufacturing | 2026 |
| Kiara Limited | Manufacturing | 2003 |
| KIB Properties Limited | Real estate | 2025 |
| Kicm Ltd | Professional & scientific | 2026 |
| KID 'N' Play Limited | Administrative & support | 1996 |
| Kiddo Limited | Other services | 2003 |
| Kiddycook Franchising Limited | Education | 2009 |
| Kids Kabin | Arts & recreation | 2000 |
| Kiec Global Ltd. | Education | 2020 |
| Kielder Investments Limited | Professional & scientific | 2017 |
| Kikasi Ltd | Wholesale & retail | 2021 |
| Kiki Sails Ltd | Arts & recreation | 2017 |
| Kiki Store Ltd | Wholesale & retail | 2024 |
| Kiko Property Ltd | Real estate | 2019 |
| Kilic Properties NE Ltd | Real estate | 2025 |
| Killingworth Auto Repair Centre Ltd | Wholesale & retail | 2025 |
| Kilpatrick Utilities Limited | Construction | 2018 |
| Kilvington Grove Limited | Mining & quarrying | 2018 |