| Jassat Investments Limited | Administrative & support | 2018 |
| Jassi Capital Ltd | Information & communication | 2022 |
| Jassi Estates Limited | Real estate | 2017 |
| Jassona Investments Limited | Real estate | 2019 |
| Jastan Properties Ltd | Real estate | 2024 |
| Jastra.J Limited | Transport & logistics | 2024 |
| Jasvir Limited | Real estate | 2002 |
| Jaswal Consulting Limited | Professional & scientific | 2016 |
| Jatha Logistics Ltd | Transport & logistics | 2022 |
| Jatha Properties Limited | Real estate | 2017 |
| Jathanproperties Ltd | Real estate | 2023 |
| Jatson Investment Ltd | Administrative & support | 2020 |
| Jatt Flex Garmz Limited | Wholesale & retail | 2023 |
| Java Lounge Blythe Valley Limited | Hospitality | 2016 |
| Java Trading 1 Ltd | Hospitality | 2025 |
| Javad Delivery Ltd | Transport & logistics | 2025 |
| Javaid Estates Ltd | Real estate | 2020 |
| Javan Global Ltd | Hospitality | 2016 |
| Javan Global One Limited | Wholesale & retail | 2017 |
| Javed & Co Limited | Extraterritorial | 2014 |
| Javed & Sons Birmingham Limited | Wholesale & retail | 2025 |
| Javed Iqbal Machinery and Crane Spare Parts Trading Company Ltd | Wholesale & retail | 2022 |
| Javeria Tariq Consultants Ltd | Education | 2026 |
| Javo Consultancy Ltd | Information & communication | 2017 |
| Jawad Care Ltd | Health & social care | 2020 |
| Jawad Saeed Ltd | Wholesale & retail | 2023 |
| Jawan Forever Ltd | Wholesale & retail | 2024 |
| Jawel Paints (Erdington) Limited | Wholesale & retail | 2005 |
| Jawhar Fragrances Limited | Wholesale & retail | 2024 |
| Jawi Transport Ltd | Transport & logistics | 2026 |
| Jaws Claws & Beaks Garden & Pet Store Ltd | Wholesale & retail | 2007 |
| Jawwad Software Solutions Limited | Information & communication | 2013 |
| JAX Art Limited | Wholesale & retail | 2002 |
| Jaxs House Limited | Real estate | 2024 |
| JAY Anthony Events Limited | Administrative & support | 2025 |
| JAY Antony Ltd. | Manufacturing | 2014 |
| JAY Birmingham Hair UK Limited | Wholesale & retail | 2018 |
| JAY Car Sales Limited | Wholesale & retail | 2018 |
| JAY CEE (Lichfield) Engineering Limited | Manufacturing | 1974 |
| JAY D Williams Limited | Wholesale & retail | 2016 |
| JAY DEE Custom Guitars Limited | Manufacturing | 1982 |
| JAY DOT Three UK Ltd | Wholesale & retail | 2020 |
| JAY Jalaram Day Centre Limited | Health & social care | 2014 |
| JAY K9 Security Ltd | Other services | 2022 |
| JAY KAY Beauty Limited | Other services | 2026 |
| JAY Lakshmi Ltd | Health & social care | 2012 |
| JAY Moore Ltd | Education | 2018 |
| JAY Morgan Personal Training Ltd. | Arts & recreation | 2016 |
| JAY Removals Ltd | Transport & logistics | 2023 |
| JAY Services Ltd | Wholesale & retail | 2019 |
| JAY SRI Lankan Street Food Ltd | Wholesale & retail | 2025 |
| Jay's Recovery Limited | Transport & logistics | 2026 |
| Jay's Roofworks Ltd | Construction | 2026 |
| Jay-Hwa International Ltd | Wholesale & retail | 2024 |
| Jay-Zone Ltd | Hospitality | 2019 |
| Jaya SAI Properties Limited | Real estate | 2022 |
| Jaya.S Limited | Public administration | 2021 |
| Jayce Housing Ltd | Real estate | 2026 |
| Jaycue Limited | Professional & scientific | 2025 |
| Jayden TM Ltd | Construction | 2023 |
| Jayjay Investments Ltd | Real estate | 2022 |
| JAYJAYA8 Limited | Professional & scientific | 2021 |
| Jaykay Foods Limited | Hospitality | 2018 |
| Jaykench Autoservices Ltd | Professional & scientific | 2026 |
| Jaylani Services Ltd | Transport & logistics | 2026 |
| Jayman Autos Ltd | Wholesale & retail | 2019 |
| Jayne Orton Yoga Ltd | Arts & recreation | 2021 |
| Jayora Ltd | Wholesale & retail | 2025 |
| Jayrintz Ltd | Health & social care | 2020 |
| Jays Convenience Store LLP | | 2008 |
| Jays Gadgets Limited | Wholesale & retail | 2025 |
| Jays Garage Ltd | Wholesale & retail | 2023 |
| Jays Garden Services Ltd. | Administrative & support | 2006 |
| Jays Snax Ltd | Wholesale & retail | 2019 |
| Jays Vapour Trail Ltd | Wholesale & retail | 2016 |
| Jaysco Holdings Limited | Information & communication | 2014 |
| Jayshaw Stores Limited | Wholesale & retail | 2015 |
| Jayten Properties Limited | Real estate | 2025 |
| Jayzeee Ltd | Hospitality | 2024 |
| Jayzz Logistics Ltd | Wholesale & retail | 2025 |
| JAZ Products Ltd | Wholesale & retail | 2024 |
| JAZ Taxi Rentals Ltd | Administrative & support | 2023 |
| JAZ Trading Academy Ltd | Extraterritorial | 2025 |
| Jaza Trades Ltd | Wholesale & retail | 2024 |
| Jazba Entertainment Ltd. | Wholesale & retail | 2012 |
| Jazman Ltd | Real estate | 2025 |
| Jazz Hands Investments Limited | Real estate | 2017 |
| Jazzy Colours (UK) Ltd | Wholesale & retail | 2021 |
| Jazzy Rose Flowers Ltd | Wholesale & retail | 2025 |
| JB & AG Property Services Limited | Real estate | 2021 |
| JB & IS Company Ltd | Real estate | 2022 |
| JB & Y Limited | Real estate | 2024 |
| JB Accountancy 1963 Limited | Administrative & support | 2012 |
| JB Balog Limited | Transport & logistics | 2018 |
| JB Bespoke Ltd | Manufacturing | 2023 |
| JB Convenience Ltd | Wholesale & retail | 2012 |
| JB Cooker Service Ltd | Manufacturing | 2021 |
| JB Couriers Ltd | Transport & logistics | 2025 |
| JB DE Villiers Limited | Professional & scientific | 2024 |
| JB FHC Limited | Other services | 2020 |