| Kapis Limited | Other services | 2014 |
| Kapishe Homes Limited | Real estate | 2024 |
| Kapishe Limited | Manufacturing | 2026 |
| Kapital Accountancy Limited | Professional & scientific | 2022 |
| Kapital Accountants Limited | Professional & scientific | 2011 |
| Kapital D Ltd | Real estate | 2024 |
| Kapital Events Ltd | Hospitality | 2025 |
| Kapital Foods Ltd | Wholesale & retail | 2020 |
| Kapital Management Ltd | Real estate | 2023 |
| Kapital Venue Leicester Ltd | Hospitality | 2019 |
| Kapoor Medical Ltd | Health & social care | 2021 |
| Kappika Ventures Holdco I Limited | Financial services | 2025 |
| Kappika Ventures LLP | | 2025 |
| Kaprekar AKS Limited | Professional & scientific | 2011 |
| Kaprekar Limited | Professional & scientific | 2017 |
| Kaprekar Solutions Limited | Professional & scientific | 2011 |
| Kapur Investments Limited | Professional & scientific | 2022 |
| Kapuri Limited | Real estate | 2025 |
| KAR Chauffeur Ltd | Other services | 2016 |
| KAR Vault Ltd | Wholesale & retail | 2024 |
| Kara Healthcare (Beechdale Care) Ltd | Health & social care | 2025 |
| Kara Healthcare (Beechdale House) Ltd | Real estate | 2025 |
| Kara Healthcare (Cedar House) Ltd | Real estate | 2023 |
| Kara Healthcare (North East Group) Ltd | Professional & scientific | 2024 |
| Kara Healthcare (Park House Care) Ltd | Health & social care | 2023 |
| Kara Healthcare (Park House) Ltd | Real estate | 2023 |
| Kara Healthcare (Simmins Care) Ltd | Health & social care | 2025 |
| Kara Healthcare Group Ltd | Health & social care | 2023 |
| Kara Healthcare Ltd | Other services | 2023 |
| Kara Property Ltd | Administrative & support | 2016 |
| Kara Transport Ltd | Transport & logistics | 2019 |
| Kara UK Investments Ltd | Real estate | 2022 |
| Karaca Electronic Services (UK) Limited | Manufacturing | 2021 |
| Karadia Trims Ltd | Wholesale & retail | 2013 |
| Karageorge Brothers Ltd | Wholesale & retail | 2018 |
| Karageorge Corporation Limited | Wholesale & retail | 2011 |
| Karamtaxis Ltd | Transport & logistics | 2025 |
| Karandash Consulting Limited | Professional & scientific | 2020 |
| Karar Transport Ltd | Transport & logistics | 2026 |
| Karavan Holdings Ltd | Financial services | 2021 |
| Karayi Group Limited | Financial services | 2018 |
| Karbani Consulting Ltd | Information & communication | 2015 |
| Karbounyanchor Ltd | Health & social care | 2017 |
| Kare Remedies Limited | Health & social care | 2019 |
| Kare Staffing Ltd | Administrative & support | 2020 |
| Kareem Education & Training Ltd | Professional & scientific | 2023 |
| Karelia a Ltd | Other services | 2024 |
| Karelia Management Consulting Limited | Professional & scientific | 2013 |
| Karen Linnett Accountancy Services Limited | Professional & scientific | 2016 |
| Karen Ndiraire Limited Company Ltd | Health & social care | 2015 |
| Karen's Blinds Ltd. | Manufacturing | 1993 |
| Kargo Foods Ltd | Hospitality | 2026 |
| Kari's Trading Limited | Wholesale & retail | 2025 |
| Karia Assets Limited | Real estate | 2016 |
| Karia Holdings Ltd | Real estate | 2021 |
| Karia Rental Properties LLP | | 2018 |
| Karia-Jarvis Ltd | Information & communication | 2014 |
| Karim Bros Limited | Wholesale & retail | 2019 |
| Karim Estates Ltd | Real estate | 2020 |
| Karin Lettings Ltd | Real estate | 2019 |
| Karinya Estate Ltd | Real estate | 2025 |
| Karishma Travels Ltd | Administrative & support | 2017 |
| Kariz Ltd | Health & social care | 2017 |
| Karkar's Trading Limited | Wholesale & retail | 2024 |
| KARKH53 Ltd | Wholesale & retail | 2021 |
| Karl Watson Contracting Limited | Construction | 2010 |
| Karl's Homes Limited | Real estate | 2020 |
| Karlton Griffith Training Ltd | Other services | 2023 |
| Karm Safety Consultancy Ltd | Professional & scientific | 2019 |
| Karma Computing Limited | Information & communication | 2015 |
| Karma Retail Ltd | Wholesale & retail | 2024 |
| Karma UK Property Limited | Real estate | 2025 |
| Karman&Daleep Haulage Ltd | Administrative & support | 2023 |
| Karmatic Limited | Information & communication | 2024 |
| Karol Transport Services Ltd | Transport & logistics | 2017 |
| Karoliasons Limited | Wholesale & retail | 2025 |
| Karpaty Supermarket KA Ltd | Wholesale & retail | 2022 |
| Karra Haulage Limited | Transport & logistics | 2020 |
| Karra Properties Limited | Real estate | 2025 |
| Karran Securities Ltd | Professional & scientific | 2019 |
| Karrav Ltd | Real estate | 2023 |
| Karria Limited | Professional & scientific | 2023 |
| Karrs Patt Ltd | Professional & scientific | 2023 |
| Karsan Properties Ltd | Real estate | 2021 |
| Kartar Couriers Ltd | Transport & logistics | 2019 |
| Kartar Logistics Ltd | Transport & logistics | 2025 |
| Karteq Limited | Manufacturing | 2015 |
| Karter Thomas Limited | Administrative & support | 2017 |
| Karters Cafe Bar Ltd | Hospitality | 2025 |
| Karthik Infotech Ltd | Information & communication | 2012 |
| Kartifyuk Ltd | Wholesale & retail | 2026 |
| Kartikeya Ltd | Financial services | 2024 |
| Kartrex Ltd | Wholesale & retail | 2025 |
| Karus Property Limited | Real estate | 2019 |
| Karvass Co Ltd | Construction | 2022 |
| Karwan Foods Limited | Wholesale & retail | 2014 |
| Kary Infotech Ltd | Financial services | 2024 |
| KAS Electrical Services (Leicester) Ltd | Construction | 2024 |
| KAS Industries Limited | Administrative & support | 2024 |
| KAS Solar Services Limited | Construction | 2024 |