| K2 Driving Academy Ltd | Education | 2025 |
| K2 Polymers Limited | Water & waste | 1998 |
| K2-MARKETING Consulting Ltd | Professional & scientific | 2019 |
| K2O Investments Ltd | Real estate | 2022 |
| K2P Foods Limited | Wholesale & retail | 2022 |
| K2SKY Ltd | Wholesale & retail | 2025 |
| K3 Dental Ltd | Health & social care | 2021 |
| K3 Estate Agents Ltd | Real estate | 2022 |
| K4 Law Limited | Professional & scientific | 2011 |
| K4SU Trading Limited | Construction | 2025 |
| K7 Associates Ltd | Real estate | 2016 |
| K7 Building Compliance Ltd | Professional & scientific | 2026 |
| K7 Building Control Ltd | Professional & scientific | 2026 |
| K7 Estates Ltd | Real estate | 2018 |
| K8 Express Ltd | Hospitality | 2023 |
| K9 Transport and Recovery Specialist Ltd | Transport & logistics | 2024 |
| K9 Watchdog Ltd | Administrative & support | 2025 |
| KA Fashion Limited | Manufacturing | 2019 |
| KA Investment Group Ltd | Real estate | 2025 |
| KA NA Heritage Foods Ltd | Hospitality | 2026 |
| KA Residentials ( Halifax) Ltd | Real estate | 2023 |
| KA Residentials (Halifax) 18 Ltd | Real estate | 2023 |
| KA Residentials (Liverpool) Ltd | Real estate | 2023 |
| KA Transport Ltd | Transport & logistics | 2025 |
| KA2 Logistics Ltd | Transport & logistics | 2021 |
| KAA Enterprise Holdings Limited | Financial services | 2023 |
| KAA Enterprise Limited | Wholesale & retail | 2013 |
| Kaa-Lee Properties Limited | Real estate | 2021 |
| Kaagar Trans Ltd | Transport & logistics | 2016 |
| Kaalee Training C.I.C. | Administrative & support | 2021 |
| Kaamwali Ltd | Administrative & support | 2023 |
| Kaan Kemal Bros Consultancy Ltd | Wholesale & retail | 2024 |
| Kaap Holdings Ltd | Real estate | 2026 |
| Kaap Investments Ltd | Real estate | 2025 |
| Kaas Holdings Ltd | Real estate | 2021 |
| Kaasl Kitchen Limited | Manufacturing | 2022 |
| Kaatun Cars Ltd | Transport & logistics | 2020 |
| Kaavya Enterprise Ltd | Wholesale & retail | 2026 |
| Kaba Global Ltd | Wholesale & retail | 2025 |
| Kabaddi Confederation of the Commonwealth CIC | Education | 2025 |
| Kabasons Limited | Administrative & support | 1995 |
| Kabass Ltd | Information & communication | 2013 |
| Kabbah Nation Healthcare and Security Limited | Administrative & support | 2020 |
| Kabking Ltd | Transport & logistics | 2023 |
| Kabmad Ltd | Wholesale & retail | 2025 |
| Kabqueen Ltd | Transport & logistics | 2023 |
| Kabul Rose Ltd | Hospitality | 2024 |
| Kaby Engineers Limited | Manufacturing | 1975 |
| Kachh Investments Limited | Real estate | 2012 |
| Kachhela Properties Limited | Real estate | 2024 |
| Kachunga Properties Ltd | Real estate | 2021 |
| Kacy Developments Limited | Construction | 2021 |
| Kaczorowski Properties Ltd | Real estate | 2020 |
| KAD Financial Investment Limited | Financial services | 2018 |
| Kadal Ltd | Real estate | 2013 |
| Kadija's Hair and Beauty Salon Ltd | Other services | 2019 |
| Kadiri Laundrette Ltd | Other services | 2023 |
| Kadivar Brothers Limited | Wholesale & retail | 2022 |
| Kadoomi Holdings Limited | Financial services | 2020 |
| Kadri Taxis Ltd | Transport & logistics | 2023 |
| Kadva Autos Ltd | Wholesale & retail | 2023 |
| Kadycutz Ltd | Other services | 2021 |
| Kafeena Ltd | Wholesale & retail | 2023 |
| Kagdi Fashion COM Ltd | Manufacturing | 2019 |
| Kagzi Medical Limited | Health & social care | 2014 |
| Kagzi Styles Ltd | Manufacturing | 2022 |
| Kahleej Ltd | Real estate | 2025 |
| Kahlon Construction Leicester Ltd | Construction | 2025 |
| Kahlon Homes Ltd | Real estate | 2018 |
| Kahn Holdings Limited | Financial services | 2022 |
| Kahzi Solutions Ltd | Administrative & support | 2022 |
| KAI Homes Limited | Real estate | 2024 |
| KAI Kitchen Co LLP | | 2016 |
| KAI Motors Limited | Wholesale & retail | 2022 |
| KAI Osman Ltd | Health & social care | 2022 |
| KAI PAI Limited | Hospitality | 2019 |
| Kai-Zen Change for Good CIC | Professional & scientific | 2011 |
| Kaida Properties Limited | Real estate | 2026 |
| Kaiem Ltd | Health & social care | 2024 |
| Kaila Enterprises Ltd | Wholesale & retail | 2021 |
| Kailash Manco Ltd | Other services | 2025 |
| Kailash Residential Ltd | Real estate | 2026 |
| Kailey Logistics Limited | Transport & logistics | 2026 |
| Kaine Management Ltd | Education | 2011 |
| Kainths Automotive Ltd | Wholesale & retail | 2018 |
| Kairo & Quinn Ltd | Administrative & support | 2024 |
| Kaiser Komms Ltd | Construction | 2025 |
| Kaistar Ltd | Construction | 2025 |
| Kaiyang Limited | Hospitality | 2023 |
| Kaizen 8 Group Ltd | Education | 2024 |
| Kaizen Herb Limited | Wholesale & retail | 2023 |
| Kaizen Personal Training Ltd | Arts & recreation | 2025 |
| Kaizen Research Ltd | Professional & scientific | 2025 |
| KAJ Maintenance Ltd | Construction | 2023 |
| KAJ Property Management Ltd | Real estate | 2025 |
| Kajla Logistics Limited | Transport & logistics | 2025 |
| Kajri Limited | Wholesale & retail | 2025 |
| Kajs Investments Ltd | Households | 2020 |
| Kaka Barber Leicester Ltd | Other services | 2022 |
| Kaka Katering Limited | Hospitality | 2010 |