| Knightsbridge Representatives Ltd | Information & communication | 2024 |
| Knightswood Furniture Limited | Wholesale & retail | 2022 |
| Knightwatch Services Limited | Other services | 2003 |
| Knitwell Wools U.K. Limited | Wholesale & retail | 2020 |
| Knlk Ltd | Transport & logistics | 2026 |
| Knowle Manor Care Ltd | Health & social care | 2026 |
| Knowledge Gate Ltd | Wholesale & retail | 2025 |
| Knowsley Street Motors Ltd | Wholesale & retail | 2022 |
| KNR Housing Ltd | Real estate | 2026 |
| KNR Properties Ltd | Real estate | 2009 |
| KNS Contractors Ltd | Construction | 2018 |
| KO Padel Limited | Arts & recreation | 2026 |
| Kodi Steakhouse Limited | Hospitality | 2019 |
| Kofi's Castles Ltd | Real estate | 2019 |
| KOJ Packaging Limited | Manufacturing | 2013 |
| Kokab Ltd | Wholesale & retail | 2025 |
| KOKO15 Ltd. | Information & communication | 2015 |
| Kokoon Events Limited | Professional & scientific | 2024 |
| Kokoon Holdings Limited | Financial services | 2016 |
| Kokoon Limited | Professional & scientific | 2005 |
| Kokosdesserts Ltd | Hospitality | 2025 |
| Kola Forklift Training Ltd | Education | 2024 |
| Kolorprintuk Ltd | Manufacturing | 2020 |
| Komojin Limited | Wholesale & retail | 2025 |
| Konzept Performance Limited | Administrative & support | 2022 |
| Kookie Haven Limited | Wholesale & retail | 2022 |
| KOP International Limited | Arts & recreation | 2024 |
| Kopva Ltd | Information & communication | 2020 |
| KOR Property Management Ltd | Real estate | 2025 |
| Korana Studio Ltd | Information & communication | 2025 |
| Korda Ltd | Information & communication | 2026 |
| Koret Softee UK Ltd | Wholesale & retail | 2025 |
| Kornoo Limited | Manufacturing | 2026 |
| KOS Projects Limited | Construction | 2017 |
| Kosar's FC Ltd | Hospitality | 2023 |
| Kostella Holdings Limited | Financial services | 2024 |
| Kotl Leeds Ltd | Hospitality | 2026 |
| Kotli Landscape Ltd | Administrative & support | 2025 |
| Koube-Nb UK Limited | Other services | 2022 |
| Kouchini Limited | Manufacturing | 2022 |
| Koval Estates Limited | Real estate | 2021 |
| Koval SRO Ltd | Transport & logistics | 2026 |
| Kovexa Solutions Ltd | Administrative & support | 2025 |
| Koyuwa Limited | Construction | 2018 |
| Kozzy Beds Ltd | Wholesale & retail | 2020 |
| KP Basra Properties Ltd | Real estate | 2025 |
| KP Prints Ltd | Wholesale & retail | 2026 |
| KP Visa Consultants Limited | Professional & scientific | 2026 |
| KP Yorkshire Ltd | Wholesale & retail | 2025 |
| KP31 Ltd | Health & social care | 2021 |
| Kpmcl Limited | Information & communication | 2021 |
| Kpmuk Ltd | Professional & scientific | 2020 |
| KQ Property Holdings Limited | Households | 2023 |
| KR Cleaning Services Limited | Administrative & support | 2024 |
| KR Consultancy Ltd | Professional & scientific | 2026 |
| KR Courier Services Ltd | Transport & logistics | 2026 |
| Kraken Logistics Solutions Ltd | Transport & logistics | 2026 |
| Kraken Vehicle Logistics Ltd | Transport & logistics | 2025 |
| Kratos Enterprises Ltd | Real estate | 2021 |
| Krazy Fried Chicken Ltd | Hospitality | 2018 |
| Kribbs Ltd | Real estate | 2021 |
| Krispy Kravings Ltd | Hospitality | 2025 |
| Krispys FC Ltd | Hospitality | 2021 |
| Kristal Clear Property Solutions Limited | Hospitality | 2025 |
| Kristian Logistics Ltd | Transport & logistics | 2026 |
| Kritzinger Anaesthetic Services Ltd | Health & social care | 2015 |
| Krrazy Ltd | Administrative & support | 2019 |
| KRS EYE Care Ltd | Health & social care | 2025 |
| KRS Performance Ltd | Wholesale & retail | 2025 |
| Krt.Interiors Ltd | Construction | 2024 |
| Krunwholesales Limited | Wholesale & retail | 2026 |
| Kruvi Properties Ltd | Real estate | 2025 |
| KS Car Hire Limited | Administrative & support | 2013 |
| KS Clinic Ltd | Health & social care | 2025 |
| KS Investors Ltd | Real estate | 2025 |
| KS Performance Valets Ltd | Administrative & support | 2024 |
| KS Solanki Ltd | Wholesale & retail | 2024 |
| KS Works Property Limited | Real estate | 2024 |
| KSB Accounts Limited | Professional & scientific | 2025 |
| KSH Softwares Ltd | Information & communication | 2025 |
| KSK Energy Solution Ltd | Construction | 2019 |
| KSK Estates Limited | Real estate | 2020 |
| KSM Builders and Sons Ltd | Construction | 2013 |
| KSM Builders Group Limited | Construction | 2022 |
| Ksmy Investments Ltd | Real estate | 2025 |
| KSR Rentals Ltd | Households | 2025 |
| Ksrga Consultants Limited | Administrative & support | 2014 |
| Kswrhs Road Haulage Services Limited | Transport & logistics | 2018 |
| Ktec Windows Ltd | Construction | 2023 |
| KTM Site Services Limited | Other services | 2016 |
| Kube Real Estate Limited | Real estate | 2024 |
| Kubus (BFD) Limited | Wholesale & retail | 2017 |
| Kubus Kurdish Limited | Wholesale & retail | 2023 |
| Kubus Market Bradford Ltd | Wholesale & retail | 2025 |
| Kubus Mini Market Bradford Limited | Wholesale & retail | 2024 |
| KUE Engineering Limited | Construction | 1973 |
| KUE Group Ltd | Construction | 2006 |
| Kukatree Limited | Information & communication | 2018 |
| Kula Support Services Limited | Administrative & support | 2018 |
| Kuldeep Ltd | Real estate | 2013 |