| JSK Property Developments Ltd | Real estate | 2020 |
| JSK Property ENT Ltd | Real estate | 2023 |
| JSK Property Group Limited | Real estate | 2024 |
| JSM Maintenance Ltd | Transport & logistics | 2026 |
| JSM Organization Ltd | Wholesale & retail | 2024 |
| JSM Store Ltd | Wholesale & retail | 2026 |
| JSM Wealth Ltd | Financial services | 2017 |
| Jsmp Limited | Financial services | 2022 |
| JSN Build Ltd | Construction | 2024 |
| JSN Couriers Ltd | Transport & logistics | 2019 |
| JSN Transportation Ltd | Transport & logistics | 2024 |
| Jsnt Limited | Real estate | 2024 |
| JSP Enterprises Ltd | Wholesale & retail | 2026 |
| JSP Virtual Ltd | Administrative & support | 2020 |
| JSR (HD) Ltd | Hospitality | 2021 |
| JSR Investments (Midlands) Ltd | Real estate | 2018 |
| JSR Leicester Ltd | Manufacturing | 2021 |
| JSR Property Management Limited | Real estate | 2023 |
| JSR RAI Limited | Extraterritorial | 2023 |
| JSR Real Estate Limited | Real estate | 2025 |
| JSS Builder Services Limited | Construction | 2026 |
| JSS Commercial Vehicles Limited | Wholesale & retail | 2019 |
| JSS Engineering Consultancy Ltd | Professional & scientific | 2022 |
| JSS Impact Consulting Ltd | Professional & scientific | 2026 |
| JST Distributions Ltd | Wholesale & retail | 2026 |
| JST Upholstery Ltd | Manufacturing | 2024 |
| Jstarcars Ltd | Wholesale & retail | 2020 |
| Jstf Holdings Ltd | Financial services | 2024 |
| JSV Private Limited | Wholesale & retail | 2025 |
| JT - Amos Lodge Rentals Limited | Real estate | 2022 |
| JT Compassionate Care Ltd | Health & social care | 2019 |
| JT Construction (Midlands) Ltd | Construction | 2020 |
| JT Consultancy & Engineering Ltd | Professional & scientific | 2021 |
| JT Management Consultancy Ltd | Construction | 2023 |
| JT Modelling Limited | Professional & scientific | 2022 |
| JT Witcombe Developments Ltd | Construction | 2016 |
| JTC Roofing Contractors Limited | Construction | 1996 |
| Jtdecs Limited | Other services | 2018 |
| JTH Concerts & Live Events Limited | Administrative & support | 2012 |
| JTI Electrical Ltd | Construction | 2023 |
| Jtkb Creative Ltd | Professional & scientific | 2025 |
| JTM Logistics Services Limited | Transport & logistics | 2026 |
| Jtmb Holdings Ltd | Financial services | 2024 |
| Jtmb Ltd | Wholesale & retail | 2021 |
| Jtmb Online Ltd | Education | 2022 |
| Jtmb Recruitment Ltd | Administrative & support | 2024 |
| Jtmb Warehousing Ltd | Wholesale & retail | 2024 |
| Jtree Properties Ltd | Real estate | 2026 |
| JUA Consultancy Services Ltd | Administrative & support | 2026 |
| Juanelma Limited | Transport & logistics | 2026 |
| JUB Limited | Wholesale & retail | 2011 |
| JUB Systems UK Limited | Manufacturing | 2008 |
| Jubb (UK) Limited | Manufacturing | 2005 |
| Jubba Travel & Communications Limited | Wholesale & retail | 2008 |
| Jubilee Care Ltd | Health & social care | 1998 |
| Jubilee Premium Dog Food Ltd | Manufacturing | 2002 |
| Jubilee Taxis Ltd | Transport & logistics | 2014 |
| JUBILEE2014 Limited | Health & social care | 2014 |
| Judge Consultancy Limited | Administrative & support | 2012 |
| Judge Estates Limited | Real estate | 2018 |
| Judge Optics Ltd | Health & social care | 2017 |
| Judge Urban Estates Ltd | Households | 2026 |
| Judy Building Works Ltd | Construction | 2020 |
| Juemstelle Limited | Health & social care | 2016 |
| Juggernaut Technology Solutions Ltd | Wholesale & retail | 2026 |
| Juice BAE Ltd | Manufacturing | 2025 |
| Juice Creative Design Limited | Administrative & support | 2003 |
| Juice Funky Bar Ltd | Hospitality | 2023 |
| Juice N Jacks Ltd | Wholesale & retail | 2026 |
| Juicecloud Limited | Wholesale & retail | 2021 |
| Juicy Booth Limited | Wholesale & retail | 2014 |
| Julemi Trans Ltd | Transport & logistics | 2017 |
| Jules and Stones Investments Ltd | Real estate | 2026 |
| Jules and Stones Ltd | Real estate | 2025 |
| Jules Cafe & Deli Ltd | Hospitality | 2023 |
| Jules Private Limited | Health & social care | 2019 |
| Julian Guidetti Music Ltd | Information & communication | 2016 |
| Juliana Pazourou Ltd | Professional & scientific | 2019 |
| Julie at the Rectory Limited | Wholesale & retail | 2012 |
| Julie News Limited | Wholesale & retail | 2017 |
| Julie's Cycles Limited | Wholesale & retail | 2005 |
| Julies Properties Ltd | Real estate | 2003 |
| Julius Properties Limited | Professional & scientific | 2006 |
| Juma COM Vent Ltd | Health & social care | 2025 |
| Jumbhani Ltd | Real estate | 2020 |
| Jumir Construction Ltd | Construction | 2022 |
| Jump Parkour Ltd | Arts & recreation | 2014 |
| Jumpstart Solutions Limited | Extraterritorial | 2019 |
| Jumpstart Sustainability Limited | Professional & scientific | 2013 |
| Junaideco Ltd | Construction | 2024 |
| Junebaby Limited | Wholesale & retail | 2022 |
| Junetree Ltd | Manufacturing | 2025 |
| Jungle Paprika Ltd | Hospitality | 2021 |
| Junior James Limited | Health & social care | 2013 |
| Junior Property Ltd | Real estate | 2016 |
| Junior's Orphanage Home | Other services | 2024 |
| Juniper Media Limited | Professional & scientific | 2011 |
| Junnurain Ltd | Wholesale & retail | 2025 |
| Junon Ltd | Administrative & support | 2025 |
| Junu Enterprises Limited | Information & communication | 2025 |