| Kfout Ltd | Wholesale & retail | 2023 |
| KG Motors Limited | Wholesale & retail | 2024 |
| KGR Limited | Real estate | 2018 |
| KH Design and Constructions Limited | Construction | 2022 |
| KH Fulfillment Limited | Transport & logistics | 2018 |
| KH4N Corporations Ltd | Health & social care | 2025 |
| Khalil Aljafari Limited | Construction | 2020 |
| Khalsatechsolution Ltd | Wholesale & retail | 2026 |
| Khan Investment Corporation Ltd | Real estate | 2018 |
| Khanal Limited | Hospitality | 2019 |
| Khanna Capital LLP | | 2019 |
| Khaoes Ltd | Wholesale & retail | 2023 |
| Kharazian Properties Ltd | Real estate | 2026 |
| Khayber Halal Meat Ltd | Wholesale & retail | 2019 |
| Khayri DAS Morghab (1&1) Limited | Hospitality | 2011 |
| Khetani Property Developers Limited | Real estate | 2018 |
| KHH Services Limited | Administrative & support | 2023 |
| Khiri Holdings Ltd | Real estate | 2022 |
| Khodiyar Express Ltd | Wholesale & retail | 2014 |
| Khodiyar MAA Limited | Professional & scientific | 2025 |
| Khud Gabbar Limited | Real estate | 2016 |
| Khufu Ltd | Wholesale & retail | 2019 |
| Khushab Limited | Real estate | 2019 |
| Khushi Investments Ltd. | Real estate | 2021 |
| Khutba Labs Ltd | Information & communication | 2024 |
| Ki&Co Limited | Construction | 2017 |
| KIA Construction Limited | Construction | 2025 |
| KIA Facilities Ltd | Construction | 2023 |
| KIA Host Limited | Information & communication | 2020 |
| KIA Secure Limited | Administrative & support | 2025 |
| Kiaan Supply Ltd | Wholesale & retail | 2022 |
| Kianexa Ltd | Wholesale & retail | 2026 |
| Kianysa Limited | Wholesale & retail | 2026 |
| Kiasun Ltd | Real estate | 2024 |
| Kick-Off Sports Group Limited | Arts & recreation | 2019 |
| Kiddie Care Ltd | Health & social care | 2017 |
| Kidman Partners Ltd | Transport & logistics | 2018 |
| Kids Nation Limited | Wholesale & retail | 2025 |
| Kiemel Associates Limited | Financial services | 2015 |
| Kiis Dental Hemel Ltd | Health & social care | 2022 |
| Kiis Dental NH Ltd | Health & social care | 2024 |
| Kiis Dental Watford Ltd | Health & social care | 2024 |
| Kiis Estates Ltd | Real estate | 2024 |
| Kiis Group Ltd | Health & social care | 2021 |
| Kiko Invest Ltd | Real estate | 2023 |
| Kilburn Supermarket Limited | Wholesale & retail | 2013 |
| Kili People Ltd | Education | 2011 |
| Kilmarnock Leisure Limited | Real estate | 2016 |
| Kim's Gardens Ltd | Construction | 2021 |
| Kimaya Ltd | Wholesale & retail | 2017 |
| Kimberley Hathaway Services Private Limited | Wholesale & retail | 2022 |
| Kimmeridge Shop Ltd | Wholesale & retail | 2021 |
| Kinch Enterprises Limited | Real estate | 2001 |
| Kind at Heart CIC | Wholesale & retail | 2022 |
| Kinetech Tape Ltd | Health & social care | 2025 |
| Kinetic One Limited | Information & communication | 2015 |
| Kingdom Coffee Ltd | Hospitality | 2025 |
| Kingdom of Wood Limited | Manufacturing | 2009 |
| Kingdom Property Management Limited | Real estate | 2014 |
| Kingfisher Heating and Plumbing Limited | Construction | 2012 |
| Kingfisher Property and Lettings Ltd | Hospitality | 2026 |
| Kingfishers Investment Ltd | Real estate | 2024 |
| Kings Cross DRY Cleaners Ltd | Other services | 2012 |
| Kings Wings Ltd | Hospitality | 2025 |
| Kingsbury Maintenance Ltd | Construction | 2019 |
| Kingsley Hunt Ltd | Administrative & support | 2025 |
| Kingsley Traders Limited | Wholesale & retail | 2025 |
| Kingswood Trading Ltd | Wholesale & retail | 2022 |
| Kink Ltd | Manufacturing | 2025 |
| KIP Mcgrath Tuition Wembley LP | | 2018 |
| KIRIL77 Ltd | Transport & logistics | 2017 |
| Kirkland Nails Ltd | Other services | 2025 |
| Kirti Diamonds and Jewelers Ltd | Wholesale & retail | 2024 |
| Kirujan Holding Limited | Wholesale & retail | 2023 |
| Kisha Logistics Services Limited | Transport & logistics | 2020 |
| Kishan Marketing Limited | Wholesale & retail | 2022 |
| Kishvikaa Ltd | Other services | 2024 |
| Kismaayo Tailor Ltd | Other services | 2024 |
| Kismit Investments Ltd | Wholesale & retail | 2024 |
| Kitchen & Bathroom Supplier Ltd | Wholesale & retail | 2012 |
| Kitchen Stone Worktop Ltd | Manufacturing | 2025 |
| Kitchen Worktops Near ME Limited | Construction | 2025 |
| Kitchley Ltd | Wholesale & retail | 2025 |
| Kitchora Limited | Wholesale & retail | 2026 |
| KIX Initiative CIC | Education | 2025 |
| KJ OPS Limited | Professional & scientific | 2025 |
| Kjellbergs Ltd. | Wholesale & retail | 2018 |
| Kjmentertainment Ltd | Arts & recreation | 2019 |
| KJS Property Services UK Limited | Real estate | 2026 |
| Kjup Ltd | Other services | 2026 |
| KK Digital Marketing Services Ltd | Information & communication | 2019 |
| KK Events Ltd | Administrative & support | 2022 |
| KK Liquor Store Ltd | Wholesale & retail | 2018 |
| KK Sounds Promix Ltd | Information & communication | 2019 |
| KK Tyres Limited | Wholesale & retail | 2018 |
| Kkes Limited | Professional & scientific | 2015 |
| KKR Property Management Ltd | Real estate | 2025 |
| Kkrp Construction Ltd | Construction | 2025 |
| Kkumann Capital (Church Street) Ltd | Construction | 2019 |
| KL Club Ltd | Health & social care | 2026 |