| Kaaasc Limited | Real estate | 2025 |
| Kaaram Ltd | Hospitality | 2014 |
| Kabbam Limited | Real estate | 2026 |
| Kabiy Enterprises Limited | Arts & recreation | 2013 |
| Kace Capital Solutions Ltd | Professional & scientific | 2025 |
| Kaerib Traders Ltd | Transport & logistics | 2012 |
| Kafkaf Limited | Hospitality | 2025 |
| KAG Holdings Essex Limited | Financial services | 2021 |
| Kaidem Visuals Ltd | Information & communication | 2023 |
| Kaikhasraw Ltd | Wholesale & retail | 2025 |
| Kaikki Limited | Information & communication | 2016 |
| Kailey Myrah Property Services Limited | Real estate | 2024 |
| Kain Tayo Let's EAT Ltd | Manufacturing | 2025 |
| Kainos Healthcare Ltd | Health & social care | 2022 |
| Kairo Properties Ltd | Real estate | 2025 |
| Kairos Habitat Ltd | Hospitality | 2021 |
| Kairos Media Works Limited | Information & communication | 2018 |
| Kaisi Global Limited | Professional & scientific | 2025 |
| Kaiv Technologies Ltd | Information & communication | 2018 |
| Kaiya’S Boutique Limited | Wholesale & retail | 2025 |
| Kaiym Ltd | Manufacturing | 2026 |
| Kaizer Carpentry Ltd | Construction | 2019 |
| Kaka Properties Limited | Real estate | 2012 |
| Kakanos Construction Limited | Construction | 2024 |
| Kalakriti Limited | Wholesale & retail | 2023 |
| Kali Holdings Limited | Financial services | 2020 |
| Kali Property HS2 Limited | Real estate | 2020 |
| Kali Property Investments Limited | Real estate | 2020 |
| Kalsana Roofing & Construction Ltd | Construction | 2018 |
| Kalsi Builders Ltd | Construction | 2018 |
| Kalsi Contractors Limited | Construction | 2024 |
| Kalusha D&S Property Ltd | Real estate | 2025 |
| Kama Enterprises Services Ltd | Professional & scientific | 2023 |
| Kamado Kingdom Ltd | Wholesale & retail | 2020 |
| Kamal Siddiqui Social Welfare Educational Trust Working AS 'Romford Mosque' | Education | 2011 |
| Kamaran IQ Ltd | Wholesale & retail | 2025 |
| Kamarankrd Ltd | Wholesale & retail | 2025 |
| Kamilstore Limited | Wholesale & retail | 2021 |
| Kamora Investments Limited | Financial services | 2022 |
| Kams Retail Services Ltd | Wholesale & retail | 2024 |
| Kamumic Ltd | Real estate | 2020 |
| Kane Keep Limited | Health & social care | 1996 |
| Kang Recruitments Ltd | Administrative & support | 2019 |
| Kang Work Ltd | Construction | 2025 |
| Kango Care Ltd | Health & social care | 2024 |
| Kanha Junu General Trading Ltd | Manufacturing | 2023 |
| Kaolin Investments Limited | Real estate | 2018 |
| Kaolin Management Limited | Construction | 2021 |
| Kaps Property Ltd | Information & communication | 2025 |
| Karachi Snacks Ltd | Wholesale & retail | 2022 |
| Kare Universal Ltd | Real estate | 2025 |
| Karebery Ltd | Health & social care | 2019 |
| Kareem Cars Ltd | Transport & logistics | 2018 |
| Kareera Ltd | Administrative & support | 2025 |
| Karen Mason Creative Limited | Other services | 2017 |
| Karim Property Solutions Ltd | Construction | 2025 |
| Karimganj Trading Limited | Professional & scientific | 2023 |
| Karina's Diamond Ltd | Wholesale & retail | 2020 |
| Karlbaker Services Ltd | Professional & scientific | 2020 |
| Karmidhan Group Ltd | Financial services | 2026 |
| Karolina Anna Balbuza Limited | Professional & scientific | 2019 |
| Karpenko Media Ltd | Wholesale & retail | 2025 |
| Kart Builders Ltd | Construction | 2016 |
| Karter James Ltd | Administrative & support | 2010 |
| Karuna Bharti Ltd | Wholesale & retail | 2024 |
| KAS Building & Maintenance Ltd | Construction | 2015 |
| Kasamandan Limited | Administrative & support | 2017 |
| Kash Management Services Ltd | Other services | 2018 |
| Kashas Events Ltd | Other services | 2025 |
| Kashas QB Limited | Hospitality | 2021 |
| Kashhjoy Estates UK Limited | Real estate | 2022 |
| Kasiba Healthcare Ltd | Administrative & support | 2023 |
| Kasiba Shisha Lounge & Restaurant Limited | Hospitality | 2025 |
| Kasitron Ltd | Information & communication | 2008 |
| Kasper Development Ltd | Construction | 2024 |
| Kaspiawood Ltd | Construction | 2025 |
| Kastle Builders Ltd | Construction | 2017 |
| Kat.M Care Ltd | Health & social care | 2023 |
| Katanamart Ltd | Wholesale & retail | 2018 |
| Kates Fashion Limited | Wholesale & retail | 2024 |
| Katharos Holdings Limited | Wholesale & retail | 2020 |
| Katio Healthcare Services Limited | Health & social care | 2023 |
| Katryn Investments Limited | Real estate | 2006 |
| Kaur Enterprises Limited | Real estate | 2017 |
| Kawar RKD Ltd | Wholesale & retail | 2026 |
| Kawuc Solutions Limited | Information & communication | 2026 |
| KAY JAY Couriers Limited | Transport & logistics | 2026 |
| Kay's Van -Tastic Removals Ltd | Transport & logistics | 2025 |
| Kaya Beauty Secrets Limited | Other services | 2024 |
| Kaya K (Gillingham) 8.3 Limited | Construction | 2026 |
| Kaya K Holdings Ltd | Real estate | 2022 |
| Kaymillion Limited | Professional & scientific | 2026 |
| Kayn Consultancy Ltd | Real estate | 2025 |
| Kaystone Properties (UK) Ltd | Real estate | 2014 |
| Kaytris Limited | Information & communication | 2016 |
| KAZ Residentials Ltd | Construction | 2023 |
| Kazeda Limited | Information & communication | 2026 |
| Kazim K Limited | Manufacturing | 2023 |
| Kazmi Consulting Limited | Information & communication | 2008 |
| KB Mans Properties Limited | Real estate | 2022 |