| KJB Consulting Limited | Households | 2021 |
| KJB Tech Services Ltd | Information & communication | 2020 |
| Kjbmedic Ltd | Health & social care | 2022 |
| KJM Precast Ltd | Construction | 2023 |
| Kjpr Limited | Wholesale & retail | 2025 |
| KJR Furniture Ltd | Manufacturing | 2021 |
| KJS Enterprises Limited | Other services | 2003 |
| KK by Kelly Barlow Ltd | Other services | 2023 |
| KK Formulation Development Limited | Professional & scientific | 2023 |
| KK Hair and Beauty Bar Limited | Other services | 2018 |
| KK Rathore Enterprises Limited | Financial services | 2021 |
| KK Sons Ltd | Construction | 2025 |
| KK2 Logistics Ltd | Transport & logistics | 2024 |
| Kkamac Ltd | Professional & scientific | 2019 |
| KKB Contracts Ltd | Construction | 2021 |
| KKB Takeaway Ltd | Hospitality | 2026 |
| Kkerr Holdings Ltd | Real estate | 2023 |
| Kkerrs Projects Ltd | Hospitality | 2018 |
| Kkmd Properties Ltd | Real estate | 2023 |
| KL Interiors Limited | Construction | 2025 |
| Kladim UK Limited | Real estate | 2018 |
| Klaipeda Midco Limited | Financial services | 2024 |
| Klajdi Logistics Ltd | Transport & logistics | 2023 |
| Klara Logistics Ltd | Transport & logistics | 2024 |
| Klaraz Storez Limited | Manufacturing | 2010 |
| Klarus Consulting Limited | Professional & scientific | 2010 |
| Klasix Textile Screenprint Limited | Manufacturing | 1996 |
| Klassique Digital Marketing Services Limited | Professional & scientific | 2018 |
| Klasé Ltd | Manufacturing | 2024 |
| KLB Consultants Ltd | Professional & scientific | 2023 |
| KLC Catering Ltd | Hospitality | 2025 |
| KLC Management Ltd | Professional & scientific | 2007 |
| KLC Partnership Limited | Professional & scientific | 2017 |
| KLD Investment Ltd. | Hospitality | 2016 |
| Klean Freaks Detailing Ltd | Administrative & support | 2025 |
| Kleanera Property Management Limited | Households | 2025 |
| Kleaniche Solutions Ltd | Administrative & support | 2025 |
| Kleg Holdings Limited | Construction | 2013 |
| Kleg Offsite Build Ltd | Construction | 2024 |
| Klein Haus Limited | Wholesale & retail | 2016 |
| Kleine Noord Ltd | Real estate | 2023 |
| Kleins Autos Limited | Wholesale & retail | 2021 |
| Kler Group Limited | Real estate | 2006 |
| Kler Land Limited | Real estate | 2016 |
| Kleros Ltd | Real estate | 2025 |
| Klev Tech Ltd | Information & communication | 2024 |
| KLH CAD Services Limited | Professional & scientific | 2016 |
| Klick Consultancy Limited | Information & communication | 2025 |
| Klicnow Ltd | Administrative & support | 2012 |
| Klin Spaces Relocation Ltd | Real estate | 2024 |
| Klinhaus Ltd | Administrative & support | 2026 |
| Klinzy Cleaning Services Limited | Administrative & support | 2024 |
| Klir Online Ltd | Professional & scientific | 2022 |
| Klkerr Holdings Ltd | Arts & recreation | 2025 |
| KLL Properties Ltd | Construction | 2023 |
| Klmn Limited | Real estate | 2021 |
| KLP Holdings Limited | Households | 2024 |
| KLR Solutions Limited | Construction | 2013 |
| KLR-3 Ltd | Transport & logistics | 2025 |
| Klub Inwestora AMS Ltd. | Education | 2023 |
| Klucas Holdings Limited | Wholesale & retail | 2018 |
| KM Auto Repairs Limited | Wholesale & retail | 2020 |
| KM Care & Compliance Limited | Public administration | 2022 |
| KM Private Ltd | Health & social care | 2016 |
| KM Residential Ltd | Real estate | 2023 |
| KM Smith Limited | Hospitality | 2023 |
| KM Solutions Notts Ltd | Professional & scientific | 2020 |
| KMA Process Design Limited | Professional & scientific | 2005 |
| Kmaj Properties Ltd | Households | 2021 |
| KMB &Co Limited | Administrative & support | 2023 |
| KMB Accountants Ltd | Professional & scientific | 2016 |
| KMD Company Limited | Manufacturing | 1975 |
| Kmedia Ltd | Information & communication | 2026 |
| Kmedical Limited | Health & social care | 2025 |
| KMJ Holdings Limited | Construction | 2018 |
| KML Electrical Contractors Ltd | Construction | 2019 |
| Kmla Property Ltd | Real estate | 2023 |
| Kmst Limited | Real estate | 2003 |
| Kmts CNC Limited | Manufacturing | 2013 |
| KMW Design and Build Ltd | Professional & scientific | 2024 |
| KN Luxe Hair Ltd | Other services | 2025 |
| Knapp Coaching Ltd | Education | 2024 |
| Knapp Investing Ltd | Real estate | 2025 |
| KNB (Midlands) Limited | Wholesale & retail | 2013 |
| KNC Solutions Limited | Construction | 2026 |
| Kneeton Business Consultants Ltd | Professional & scientific | 2014 |
| Kneeton Estate LLP | | 2023 |
| KNG Care Ltd | Health & social care | 2025 |
| Knife and Fork Limited | Hospitality | 2026 |
| Knight & Co Joinery and Building Ltd | Construction | 2026 |
| Knight District Heating Limited | Construction | 2023 |
| Knight Executive Travel Limited | Transport & logistics | 2008 |
| Knight Movement Houses Ltd | Construction | 2026 |
| Knight Rider Express Courier Ltd | Administrative & support | 2016 |
| Knight Rider Security Services Ltd | Administrative & support | 2023 |
| Knight Roadcraft Ltd | Education | 2026 |
| Knighton Care Ltd | Health & social care | 2024 |
| Knighton Leisure (Hull) Limited | Arts & recreation | 2019 |
| Knighton Leisure (Nottingham) Limited | Arts & recreation | 2009 |
| Knights of Shropshire Ltd | Transport & logistics | 2025 |