| Kabeer Constructions UK Ltd | Construction | 2025 |
| Kabore & Sons Healthcare Solutions Limited | Health & social care | 2018 |
| Kadir's Grooming Ltd | Other services | 2024 |
| Kahout Trading Ltd | Transport & logistics | 2017 |
| Kahramas Trading & Contracting UK Ltd | Construction | 2024 |
| Kai&Harry Ltd | Transport & logistics | 2023 |
| Kairos Trading Ltd | Health & social care | 2019 |
| Kaizen Collection Limited | Real estate | 2017 |
| Kajla Consultancy Limited | Professional & scientific | 2023 |
| KAK Private Limited | Wholesale & retail | 2015 |
| Kalevine Ltd | Real estate | 2017 |
| Kalidas Properties Ltd | Real estate | 2008 |
| Kamal Heating Ltd | Construction | 2022 |
| Kamil UK Trading Ltd | Transport & logistics | 2025 |
| Kamp (UK) LLP | | 2024 |
| Kamp Accountants Limited | Professional & scientific | 2010 |
| Kamp Business Payroll Ltd | Financial services | 2024 |
| Kamp Business Support Ltd | Professional & scientific | 2016 |
| Kamp Consultancy Ltd | Administrative & support | 2013 |
| Kamp Garments Supplies Ltd | Public administration | 2016 |
| Kamp Holdings Ltd | Financial services | 2020 |
| Kamp Investment Properties Ltd | Real estate | 2016 |
| Kamp Marshall Wealth Ltd | Real estate | 2024 |
| Kamp Medicare Ltd | Professional & scientific | 2024 |
| Kamp Payroll Services Ltd | Professional & scientific | 2019 |
| Kamp Property Management Ltd | Other services | 2024 |
| Kamp Wealth Management Limited | Financial services | 2016 |
| Kamp Wealth Management U.K. Ltd | Financial services | 2024 |
| Kamprandclaims Ltd | Professional & scientific | 2024 |
| Kanaby Enterprise Ltd | Wholesale & retail | 2013 |
| Kapp Holdings Ltd | Other services | 2021 |
| Kapture London Ltd | Education | 2026 |
| KAR Trading Ltd | Transport & logistics | 2016 |
| Karaikudi Spices Ltd | Hospitality | 2024 |
| Kardinal Consulting Limited | Information & communication | 2023 |
| Karibu Scan Ltd | Health & social care | 2025 |
| Karreeb International PVT Ltd | Wholesale & retail | 2023 |
| Kasrad Immigration Ltd | Professional & scientific | 2024 |
| Kastrati Group Ltd | Construction | 2026 |
| Katie Davies Ltd | Professional & scientific | 2021 |
| Katrina Health Limited | Health & social care | 2026 |
| Kaus Trading Ltd | Wholesale & retail | 2016 |
| Kavish Enterprise Ltd | Wholesale & retail | 2023 |
| Kavish Ltd | Professional & scientific | 2023 |
| KAY Trading Ltd | Transport & logistics | 2025 |
| KBC Kashmir Beauty Care UK Private Limited | Wholesale & retail | 2025 |
| KC Removals Limited | Transport & logistics | 2011 |
| Kdsd London Limited | Health & social care | 2021 |
| Keady Construction Limited | Construction | 2019 |
| Keeper 360 Limited | Real estate | 2021 |
| Keirhea Consulting Limited | Administrative & support | 2025 |
| Kelborn & Co. UK Ltd | Wholesale & retail | 2025 |
| Kentish Hotels Co Ltd | Hospitality | 2023 |
| Kenzo Mizumoto Limited | Professional & scientific | 2026 |
| Kerry Anns Beauty Ltd | Administrative & support | 2017 |
| Kersm Research and Training Ltd | Health & social care | 2026 |
| Ketto Ltd | Wholesale & retail | 2025 |
| Kevin Kararwa Leukaemia Trust | Health & social care | 2015 |
| KFK Martial Arts Ltd | Health & social care | 2025 |
| KFM Trading Ltd | Transport & logistics | 2026 |
| KGN Star Parts Limited | Wholesale & retail | 2024 |
| KHA Trading Ltd | Transport & logistics | 2020 |
| Khaba London Ltd | Hospitality | 2025 |
| Khaba Ltd | Hospitality | 2025 |
| Khan Delivery Ltd | Transport & logistics | 2021 |
| Khan Dynasty Ltd | Health & social care | 2024 |
| Khan JEE Food Ltd | Hospitality | 2018 |
| Khatijaz 7 Ltd | Hospitality | 2017 |
| Khazag Freight Services PVT Ltd | Transport & logistics | 2025 |
| Khazell Limited | Professional & scientific | 2017 |
| Khebhi Property Management Ltd | Real estate | 2025 |
| Khetran Holdings Ltd | Real estate | 2019 |
| KHR Trading Ltd | Transport & logistics | 2018 |
| Khumex Poultry Products Ltd | Wholesale & retail | 2020 |
| Kiddos Publishing Ltd | Information & communication | 2025 |
| Kids GOT Swagger Ltd | Wholesale & retail | 2019 |
| Kiko 2020 Limited | Transport & logistics | 2020 |
| Kikolex Build Limited | Construction | 2018 |
| Killops Consulting Ltd | Construction | 2025 |
| Kineticaid Ltd | Information & communication | 2023 |
| King Cleaning Ltd | Administrative & support | 2012 |
| King International Shipping Services Limited | Real estate | 1988 |
| Kingreen VEG Limited | Wholesale & retail | 2014 |
| Kings Home Accommodation Ltd | Hospitality | 2022 |
| Kingston Dental Laboratory Limited | Health & social care | 2011 |
| Kingston Dental Office Ltd | Health & social care | 2021 |
| Kingston Road Management Company Limited | Households | 1996 |
| Kingswood Flooring Ltd | Construction | 2013 |
| Kinza Boutique Ltd | Wholesale & retail | 2024 |
| KJ & Kaba Limited | Construction | 2016 |
| KJ Cozy Corner Ltd | Hospitality | 2014 |
| KJ Residential Ltd | Real estate | 2026 |
| KK Pro Ltd | Wholesale & retail | 2017 |
| Kkiss Gifts Ltd | Wholesale & retail | 2022 |
| Klass Wala Rent a Car Ltd | Administrative & support | 2025 |
| Klecz Maintenance Ltd | Construction | 2019 |
| KM Auto & Adventures Ltd | Manufacturing | 2025 |
| KM Autos Ltd | Wholesale & retail | 2023 |
| KM London Trading Ltd | Transport & logistics | 2017 |
| KMK Phoenix Limited | Construction | 2016 |