| Jtbt Limited | Real estate | 2022 |
| JTC Moto Ltd | Wholesale & retail | 2018 |
| JTJ Pipeline Services Ltd | Water & waste | 2024 |
| JTL Products Ltd | Other services | 2019 |
| JTM Contract Services Ltd | Construction | 2025 |
| Juiced Properties Ltd | Real estate | 2016 |
| Julay Imports Limited | Wholesale & retail | 2001 |
| Julay Trading Limited | Wholesale & retail | 2002 |
| Julia 2015 Ltd | Transport & logistics | 2018 |
| Junita Holdings Ltd | Households | 2022 |
| Just Fair Ltd | Construction | 2021 |
| Just Imagine Heating Ltd | Construction | 2024 |
| Just Imagine Kitchens Ltd | Manufacturing | 2023 |
| Just the Business Daventry Limited | Wholesale & retail | 2020 |
| Justsech Ltd | Information & communication | 2023 |
| Justyna Kumor Ltd | Financial services | 2023 |
| JW Media Services Limited | Information & communication | 2004 |
| JWP Property Limited | Real estate | 2014 |
| Jyhds Ltd | Transport & logistics | 2022 |
| JYP Investment Ltd | Other services | 2024 |
| JZH Limited | Real estate | 2017 |
| K & C Associates Limited | Hospitality | 2004 |
| K European Limited | Transport & logistics | 2015 |
| K H Homes & Gardens Ltd | Administrative & support | 2026 |
| K LO Business Services Limited | Administrative & support | 2016 |
| K M Project Managing Limited | Professional & scientific | 2009 |
| K P Property Renorvations Ltd | Real estate | 2023 |
| K P Trucking Ltd | Transport & logistics | 2023 |
| K Prestige Properties Ltd | Real estate | 2023 |
| K Q Services Ltd | Transport & logistics | 2023 |
| K S Lall Limited | Hospitality | 2025 |
| K&A Property Ventures Ltd | Real estate | 2025 |
| K&G Property Managment Ltd | Households | 2024 |
| K&K Singh Limited | Real estate | 2024 |
| K&L Car Wash Ltd | Other services | 2020 |
| K&M Cuisine Ltd | Hospitality | 2026 |
| K&M Properties Management Ltd | Real estate | 2022 |
| K&R Management Ltd | Professional & scientific | 2023 |
| K&S Support Ltd | Transport & logistics | 2013 |
| K'S Property Management LLP | | 2019 |
| K-R Trans Ltd | Transport & logistics | 2025 |
| K. VIO Ltd | Real estate | 2025 |
| K.A. Cooke Limited | Construction | 2010 |
| K.A. Hirons Limited | Construction | 2003 |
| K.C. Twigger Ltd | Construction | 2013 |
| K.Furlong Holdings Limited | Administrative & support | 2023 |
| K.M.R. Metals Ltd | Wholesale & retail | 2021 |
| K.P Horse Transport Ltd | Agriculture & fishing | 2024 |
| KA Coaching Limited | Education | 2021 |
| KA Kits Academy C.I.C. | Education | 2017 |
| Kace Lewis Ltd | Transport & logistics | 2019 |
| Kafno & Co Properties Limited | Real estate | 2019 |
| Kafno Properties Limited | Real estate | 2021 |
| Kaga Limited | Financial services | 2023 |
| Kaga Real Limited | Real estate | 2023 |
| Kairoz Ltd | Real estate | 2023 |
| Kaishay Limited | Health & social care | 2022 |
| Kala Supported Living Ltd | Health & social care | 2020 |
| Kalinowski Consulting Ltd | Professional & scientific | 2026 |
| Kalpol Limited | Real estate | 2006 |
| Kalyxtech Limited | Administrative & support | 2026 |
| KAM Movement Ltd | Administrative & support | 2017 |
| Kamil Haulage Limited | Transport & logistics | 2014 |
| Kamis Consulting Ltd | Information & communication | 2011 |
| Kanages Ltd | Real estate | 2025 |
| Kanha Builders Ltd | Construction | 2025 |
| Kani Impex Ltd | Wholesale & retail | 2021 |
| Kanka Ltd | Transport & logistics | 2017 |
| Karak Chaii Rugby Limited | Hospitality | 2023 |
| Kararra Property Services Ltd | Administrative & support | 2026 |
| Karen Adam Consulting and Coaching Ltd | Health & social care | 2026 |
| Kargrab Campervans Limited | Manufacturing | 2014 |
| Karina Koziel Ltd | Wholesale & retail | 2020 |
| Karishmatic Kreations Limited | Manufacturing | 2017 |
| Karma PAX Prime Ltd | Transport & logistics | 2026 |
| Karmeko Limited | Professional & scientific | 2008 |
| Karol Michalik Ltd | Wholesale & retail | 2018 |
| Karpet Kingdom (Rugby) Limited | Wholesale & retail | 2012 |
| Kartel Rentals Ltd | Administrative & support | 2024 |
| Karvel Ltd | Hospitality | 2022 |
| Kash Properties Management Ltd | Real estate | 2022 |
| Kashvi Limited | Hospitality | 2019 |
| Kasprzak Trans Ltd | Transport & logistics | 2015 |
| Kasted Holdings Limited | Professional & scientific | 2006 |
| Kate Mercer Training Ltd | Administrative & support | 2014 |
| Kathmandu Kitchen Limited | Hospitality | 2014 |
| Katie and MAY Stationery Ltd | Wholesale & retail | 2025 |
| Kaudeur Consultancy Limited | Professional & scientific | 2019 |
| Kaushalya Management Company Limited | Information & communication | 2010 |
| Kavio Logistics Ltd | Transport & logistics | 2018 |
| KB Bars Ltd | Hospitality | 2019 |
| KB Health Limited | Real estate | 2015 |
| KBB Transport Ltd | Transport & logistics | 2025 |
| KBS (Mechanical) Ltd. | Construction | 2016 |
| Kcdesigns Ltd | Wholesale & retail | 2026 |
| Kckc UK Limited | Wholesale & retail | 2025 |
| KD Retail Group Ltd | Wholesale & retail | 2025 |
| KDP Transport Services Ltd | Transport & logistics | 2021 |
| Kdrss Private Limited | Real estate | 2025 |
| KDW Roof Maintenance Ltd | Construction | 2024 |