| Kaykab Logistics Ltd | Transport & logistics | 2025 |
| Kaymiah Clothing Ltd | Wholesale & retail | 2026 |
| KB Construction U.K. Ltd | Construction | 2024 |
| KBC QN Ltd | Other services | 2016 |
| KC Logistics U.K. Ltd | Transport & logistics | 2022 |
| KD Fixing Ltd | Construction | 2023 |
| KDB98 Limited | Arts & recreation | 2021 |
| Kdjj Property Investments Limited | Real estate | 2023 |
| Keap Wealth Management Ltd | Professional & scientific | 2016 |
| Keep Your Car Safe - Kycs Ltd | Wholesale & retail | 2017 |
| Keizyio's Services Ltd | Administrative & support | 2017 |
| KEN TUI Management Limited | Other services | 2024 |
| Kendi-Trans Ltd | Extraterritorial | 2019 |
| Keng Barber Ltd | Other services | 2025 |
| Kenri & Co Logistics Ltd | Transport & logistics | 2024 |
| Kentai Integrated Service Limited | Health & social care | 2017 |
| Kerrytec Sign Engineering Ltd | Wholesale & retail | 2024 |
| Kershaw B Limited | Wholesale & retail | 2023 |
| Kesar Spice Ltd | Hospitality | 2025 |
| Kevin Jones Support Services Limited | Other services | 2025 |
| Key Smart Technologies Ltd | Professional & scientific | 2015 |
| Key Steels Limited | | 1976 |
| Keystone Homes Ltd | Construction | 2020 |
| Keystone Reworks Limited | Construction | 2026 |
| KG UK Trading Ltd | Wholesale & retail | 2025 |
| KH Healthcare Solutions Limited | Health & social care | 2020 |
| Khakhau Services Limited | Health & social care | 2014 |
| Khan Engineering Ltd | Professional & scientific | 2023 |
| Khan Premier Estates Ltd | Real estate | 2025 |
| Kharel and Regmi Company Ltd | Hospitality | 2022 |
| Khosla Clearance Ltd | Wholesale & retail | 2020 |
| KIA Foods Ltd | Hospitality | 2024 |
| Kickabout Club Ltd | Arts & recreation | 2019 |
| Kieran Lloyd Ltd | Construction | 2024 |
| Kind Hands Homecare Ltd | Health & social care | 2026 |
| King's Community Church Project | Health & social care | 2000 |
| Kingdom Securities Limited | Professional & scientific | 2010 |
| Kingdom Sweets and Bakers Ltd | Wholesale & retail | 2025 |
| Kingston Partners LLP | | 2016 |
| Kingsway Van & Commercial Sales and Repairs Ltd | Wholesale & retail | 2026 |
| Kiran Homes Limited | Real estate | 2024 |
| Kiranjit Kaur Ltd | Hospitality | 2024 |
| Kirin Consultancy Limited | Health & social care | 2015 |
| Kirk DAN Limited | Wholesale & retail | 2024 |
| Kirpa Close Management Company Limited | Households | 2024 |
| KJG Consultancy Limited | Construction | 2025 |
| KK Atija Building Ltd | Construction | 2025 |
| KK Builder Merchant Ltd | Construction | 2024 |
| KK Chef Services Ltd | Hospitality | 2022 |
| KKA Consultancy Ltd | Information & communication | 2024 |
| KKR Courier Services Ltd | Transport & logistics | 2022 |
| Kleana Space UK Ltd | Financial services | 2024 |
| KLN Garments Ltd | Wholesale & retail | 2024 |
| Klosi Developments Ltd | Real estate | 2025 |
| Kmsa Investment Group Limited | Real estate | 2024 |
| Knbkta Ltd | Wholesale & retail | 2022 |
| Kneet 'N' Kleen Ltd | Administrative & support | 2026 |
| Knightsbridge Wills and Trusts Limited | Other services | 2017 |
| Knotend Ltd | Agriculture & fishing | 2025 |
| Knotstart Ltd | Financial services | 2025 |
| Koda Pubco Ltd | Hospitality | 2024 |
| Kojico Ltd | Wholesale & retail | 2025 |
| Koms Event & Exhibition Flooring Solutions Ltd | Construction | 2010 |
| Kookie & Kyngs Creations Limited | Other services | 2022 |
| Kordp Ltd | Transport & logistics | 2026 |
| Kornerstonefirst Limited | Health & social care | 2018 |
| Kp&Ia Ltd | Transport & logistics | 2019 |
| KRISTIYAN9001 Ltd | Transport & logistics | 2020 |
| Kruja Quality Facades Ltd | Construction | 2025 |
| Krunch UK | Education | 2005 |
| KRV Store Ltd | Wholesale & retail | 2023 |
| Krystek Logistic Ltd | Transport & logistics | 2020 |
| KS Bedroom and Kitchen Ltd | Households | 2019 |
| KS Kanda Ltd | Administrative & support | 2026 |
| KSB Commercial Ltd | Real estate | 2025 |
| KSB Transport Ltd | Transport & logistics | 2017 |
| KSJ Transports Ltd | Transport & logistics | 2021 |
| KSL Commercials Limited | Transport & logistics | 2019 |
| KSM Transport Ltd | Transport & logistics | 2026 |
| Kssg Logistics Ltd | Transport & logistics | 2017 |
| KST Tippers Ltd | Transport & logistics | 2026 |
| KTT Law Limited | Professional & scientific | 2016 |
| KTU Accounting Services Ltd | Professional & scientific | 2025 |
| Kuco-Rayfield Limited | Professional & scientific | 2023 |
| Kudhail & Co Ltd | Real estate | 2025 |
| Kudos Health and Social Care Training Ltd | Transport & logistics | 2018 |
| Kular Construction Limited | Construction | 2022 |
| Kundan & Manjit Property Limited | Real estate | 2025 |
| Kundi Electrical Midlands Limited | Other services | 2008 |
| Kuren Ltd | Wholesale & retail | 2024 |
| Kwayspvt Ltd | Wholesale & retail | 2024 |
| KZ Direct Ltd | Transport & logistics | 2019 |
| L G GAS (Midlands) Ltd | Administrative & support | 2022 |
| L M Products (Holdings) Limited | Financial services | 2011 |
| L&A Future Developments Ltd | Real estate | 2025 |
| L&A Future Properties Ltd | Real estate | 2021 |
| L&B Plumbing & Heating Services Ltd | Construction | 2022 |
| L.A.P. Bureau Limited | Professional & scientific | 1994 |
| L.E.D Commercial Ltd | Transport & logistics | 2019 |
| L4C Ltd | Wholesale & retail | 2025 |