| Justice 4 Ezeugo Family Limited | Professional & scientific | 2025 |
| JV Joinery Limited | Construction | 2026 |
| JVD Maintance Limited | Construction | 2010 |
| JW Cooling Ltd | Energy | 2023 |
| JZ Holdings Ltd | Real estate | 2019 |
| K & N Autos Limited | Wholesale & retail | 2025 |
| K & N Estates Limited | Real estate | 2018 |
| K B Construction Limited | Construction | 2002 |
| K B Supplies Limited | Wholesale & retail | 2018 |
| K Bava Architects Ltd | Professional & scientific | 2018 |
| K Gandecha Consultancy Limited | Administrative & support | 2019 |
| K M Pharma (UK) Limited | Other services | 2011 |
| K M Property London Limited | Real estate | 2020 |
| K Moorthy Ltd | Health & social care | 2012 |
| K&Dd Ltd | Hospitality | 2008 |
| K&S Lease Company Ltd | Administrative & support | 2026 |
| K&T Warwick Ltd | Wholesale & retail | 2023 |
| K.A.E.T. and Co. Limited | Real estate | 2026 |
| K11 Nurseries Limited | Education | 2022 |
| K2M Construction Ltd | Professional & scientific | 2022 |
| KA Purchasing & Supply Limited | Administrative & support | 2011 |
| KA WAH Corporation Limited | Administrative & support | 2010 |
| Kaaba Tours Ltd | Administrative & support | 2022 |
| Kaan Logistics Ltd | Transport & logistics | 2025 |
| Kabaka Security Solutions Ltd | Administrative & support | 2022 |
| Kabe South Limited | Real estate | 1998 |
| Kabe West Properties Limited | Construction | 1992 |
| Kabul & Istanbul Restaurant Limited | Hospitality | 2026 |
| Kabul Bazaar UK 2018 Limited | Wholesale & retail | 2018 |
| Kabul Kebab Restaurant (Edgware) Limited | Hospitality | 2024 |
| Kabul Sheeryakh Limited | Hospitality | 2015 |
| Kace Professional Services Limited | Professional & scientific | 2023 |
| Kads Beauty Limited | Other services | 2019 |
| KAF Sisters Limited | Real estate | 2024 |
| Kahr Development Ltd | Real estate | 2025 |
| Kaihan AB Ahmadzay Ltd | Wholesale & retail | 2025 |
| Kairos Training Limited | Professional & scientific | 2006 |
| Kaitia Properties Limited | Real estate | 2018 |
| Kajaine Accountants Limited | Professional & scientific | 2018 |
| Kajaine Business Solutions Ltd | Professional & scientific | 2011 |
| Kajaine Kafton LLP | | 2024 |
| Kajaine Payroll Services Limited | Administrative & support | 2007 |
| Kaklotra Ltd | Construction | 2025 |
| Kalakaar Events and Entertainment Services Ltd | Arts & recreation | 2025 |
| Kalika Academy Limited | Education | 2014 |
| Kalika Hair & Beauty Ltd | Wholesale & retail | 2008 |
| Kalvo Ltd | Wholesale & retail | 2025 |
| KAM Computers (London) Limited | Wholesale & retail | 2010 |
| KAM Fung Wong Ltd | Hospitality | 2018 |
| Kamelire Limited | Professional & scientific | 2020 |
| Kamky Ltd | Wholesale & retail | 2024 |
| Kamky Property Ltd | Real estate | 2018 |
| Kamnic Limited | Manufacturing | 2010 |
| Kampx Limited | Financial services | 2025 |
| Kams Property Consultancy Ltd | Households | 2018 |
| Kamsar Projects Limited | Professional & scientific | 2024 |
| Kamu Investments Ltd | Real estate | 2025 |
| Kamy Care Ltd | Health & social care | 2024 |
| Kanbi Investments Limited | Financial services | 2024 |
| Kandler & Co. Limited | Professional & scientific | 2009 |
| Kandoo Development Limited | Professional & scientific | 2024 |
| Kanel Ltd | Hospitality | 2025 |
| Kanha Fruit & VEG Ltd | Wholesale & retail | 2025 |
| Kanha Sweets & Namkeen Ltd | Wholesale & retail | 2025 |
| Kantech Limited | Information & communication | 2021 |
| Kanuri Limited | Extraterritorial | 2017 |
| Kanvel Holdings Ltd | Construction | 2020 |
| Kanvel Investments Ltd | Real estate | 2021 |
| Kapisi Construction Ltd | Construction | 2025 |
| Karapincha Limited | Hospitality | 2020 |
| Kardam DC Ltd | Health & social care | 2022 |
| Karia Group Holdings Limited | Professional & scientific | 2018 |
| Karina Ltd | Construction | 2026 |
| Karma Jewel Ltd | Wholesale & retail | 2024 |
| Karmans Accountants Limited | Professional & scientific | 2010 |
| Karnak Developments Ltd | Construction | 2025 |
| Karpe Diem Limited | Professional & scientific | 2019 |
| Kasbha Holdings Ltd | Financial services | 2023 |
| Kasbo Limited | Professional & scientific | 2011 |
| Kashmir Superstore Bury Limited | Wholesale & retail | 2017 |
| Kasmer Limited | Real estate | 2005 |
| Katai Media Limited | Administrative & support | 2022 |
| Kate Mclauchlan Gemstone Traders Limited | Manufacturing | 2011 |
| Kateen Holding Ltd | Real estate | 2020 |
| Kathiyawadi Kitchen London Ltd | Hospitality | 2025 |
| Katsam Care Limited | Health & social care | 2022 |
| Kauthar Limited | Wholesale & retail | 2011 |
| Kaviraj GB Limited | Wholesale & retail | 2014 |
| Kavish Global Ltd | Construction | 2014 |
| Kavya Global Limited | Wholesale & retail | 2024 |
| Kawsar General Products Ltd | Wholesale & retail | 2024 |
| Kay's Skin Studio Ltd | Other services | 2025 |
| Kaya Housing Limited | Real estate | 2009 |
| Kayaari Financial Solutions Limited | Financial services | 2023 |
| Kayal Retail Limited | Wholesale & retail | 2019 |
| Kaylan Limited | Hospitality | 1981 |
| Kayode Sogbetun & Co Ltd | Transport & logistics | 2026 |
| Kazakhstan Gold Holdings Limited | Financial services | 2023 |
| Kazzaz VIP Motors Ltd | Wholesale & retail | 2025 |
| KBC Regad Limited | Professional & scientific | 2011 |