| Jassal Brothers Limited | Hospitality | 2017 |
| Jasthetics Clinic Ltd | Health & social care | 2020 |
| Jaybee Cleaning and Removal Services Ltd | Transport & logistics | 2023 |
| Jaybees Multi-Services Limited | Construction | 2023 |
| Jaynary Ltd | Health & social care | 2023 |
| JCS Components Limited | Wholesale & retail | 2010 |
| JEO Care Services Limited | Health & social care | 2021 |
| Jerseytex Ltd. | Manufacturing | 1993 |
| Jerseytex UK Limited | Extraterritorial | 2005 |
| JGS Food Service Ltd | Hospitality | 2026 |
| JGT Coaching Ltd | Transport & logistics | 2023 |
| Jind Ltd | Transport & logistics | 2025 |
| Jireh Property Solutions Ltd | Real estate | 2024 |
| Jiya Properties (MID) Ltd | Real estate | 2024 |
| JJ Buildders UK Limited | Construction | 2020 |
| JJ Wine and Spirit Limited | Wholesale & retail | 2022 |
| JJL Logistics Ltd | Transport & logistics | 2026 |
| JJT Commercial Limited | Real estate | 2018 |
| JK Healthcare Services Ltd | Health & social care | 2020 |
| Jk's Sparkling Smiles Ltd | Health & social care | 2021 |
| JLR Property Development Limited | Construction | 2023 |
| JLR Services 1 Ltd | Manufacturing | 2019 |
| JM Gallery Ltd | Information & communication | 2025 |
| JM Transport Service Ltd | Transport & logistics | 2025 |
| Joanne Hancox Limited | Health & social care | 2012 |
| Joban Cooriers Service Ltd | Transport & logistics | 2025 |
| Jocoa Ltd | Administrative & support | 2025 |
| Johal & Sons Transport Limited | Transport & logistics | 2017 |
| John Stokes (Hard Chrome Plating & Grinding) Limited | Manufacturing | 1973 |
| Johnson Plant Maintenance & Services Ltd | Manufacturing | 2025 |
| Joseph Cleaning Services Ltd | Administrative & support | 2025 |
| Joshua & Caleb Ltd | Real estate | 2026 |
| Journal Machining Ltd | Manufacturing | 2024 |
| Joy Easton Limited | Health & social care | 2016 |
| Joyfes Ltd | Wholesale & retail | 2026 |
| Joyglad Ltd | Administrative & support | 2019 |
| JPG Traders Ltd | Wholesale & retail | 2020 |
| JRK Truck & Trailer Services Ltd | Wholesale & retail | 2021 |
| JSB Sofas Limited | Manufacturing | 2022 |
| JSC Homes Ltd | Real estate | 2021 |
| JSJ Ltd | Administrative & support | 2025 |
| JSJ Tiffin Service Limited | Hospitality | 2026 |
| Jsss Construction Ltd | Construction | 2023 |
| JTH Retail Ltd | Wholesale & retail | 2009 |
| Juicy Tubes Limited | Other services | 2010 |
| Julifast Ltd | Transport & logistics | 2025 |
| Jump Inflatable Theme Park Ltd | Arts & recreation | 2024 |
| JWD Properties Limited | Real estate | 2011 |
| K & D R Properties Limited | Real estate | 2017 |
| K Club Barber Tipton Ltd | Other services | 2024 |
| K Kumar's Group Ltd | Construction | 2025 |
| K Seven Freight Ltd | Transport & logistics | 2020 |
| K Warburton Properties Limited | Real estate | 2012 |
| K-Travel & Tourism Ltd | Transport & logistics | 2016 |
| K9 Elite Security Ltd | Administrative & support | 2024 |
| K9 Facilities Limited | Wholesale & retail | 2025 |
| Kage Mercantile Limited | Construction | 2025 |
| Kahlon & Clair Property Ltd | Real estate | 2025 |
| Kainaat Realty Group Limited | Households | 2025 |
| Kairo International Ltd | Wholesale & retail | 2026 |
| Kalamata Premium Foods Limited | Wholesale & retail | 2021 |
| Kaler Transport Ltd | Transport & logistics | 2012 |
| Kalsi Ezparcel Limited | Transport & logistics | 2013 |
| Kalsi Music Productions Ltd | Information & communication | 2025 |
| Kalt Group Ltd | Information & communication | 2023 |
| Kam's Real Estates Limited | Real estate | 2026 |
| KAP Homes Group Ltd | Real estate | 2022 |
| Karda Properties Limited | Real estate | 2017 |
| Karm Autos Ltd | Wholesale & retail | 2025 |
| Kaur's Bake N Cream Ltd | Manufacturing | 2026 |
| Kaviron Supply Ltd | Wholesale & retail | 2026 |
| KB1 Estates Limited | Real estate | 2025 |
| KB3 Logistics Limited | Transport & logistics | 2026 |
| KDK Services Ltd | Construction | 2024 |
| KDS Real Estate Midlands Limited | Real estate | 2025 |
| Keen Roofing Limited | Construction | 2010 |
| Kefin Singh Ltd | Construction | 2020 |
| Keiron Cheesbrough Ltd | Construction | 2019 |
| Kelburr Developments Ltd | Manufacturing | 2025 |
| Kellec Limited | Professional & scientific | 2007 |
| Kemma Limited | Transport & logistics | 2018 |
| Kerry Elsmore Ltd | Wholesale & retail | 2025 |
| Kevin Williams Financial Planning Limited | Financial services | 2013 |
| Keycasaa Ltd | Real estate | 2025 |
| Khaira Houses Ltd | Real estate | 2023 |
| KHALSA1313 Ltd | Transport & logistics | 2020 |
| Khinda Constructions Ltd | Construction | 2020 |
| Khosa Construction Ltd | Construction | 2026 |
| Khumalo Care Ltd | Wholesale & retail | 2022 |
| Kingsbury Services Limited | Transport & logistics | 2021 |
| Kirat&Lavin Haulage Ltd | Transport & logistics | 2024 |
| Kiss ME Kate Designs Limited | Wholesale & retail | 2011 |
| Kitchen & Interior Service Ltd | Construction | 2026 |
| Kkpg Transport Ltd | Transport & logistics | 2021 |
| Kliniquea Ltd | Health & social care | 2024 |
| Knights Concrete Solutions Ltd | Construction | 2023 |
| Knights Shop Fronts & Shutters Ltd | Construction | 2014 |
| Knights Shopfronts and Shutters (West Midlands) Ltd | Construction | 2021 |
| Knowledge Dube Ltd | Transport & logistics | 2024 |
| Knowledge Farm Limited | Professional & scientific | 2014 |