| Jana Engineering Ltd | Construction | 2023 |
| Jana Hospitality Services Limited | Real estate | 2019 |
| Janak Management Limited | Real estate | 2020 |
| Janak Properties Limited | Real estate | 2001 |
| Janak Real Estate Limited | Real estate | 2016 |
| Janam Ltd | Manufacturing | 2025 |
| Jananay Limited | Administrative & support | 2013 |
| Janaya Properties Limited | Real estate | 2016 |
| Jandoo Limited | Wholesale & retail | 2026 |
| Jane Collins Consulting Limited | Professional & scientific | 2012 |
| Jane Root Limited | Professional & scientific | 2012 |
| Janhurst Limited | | 1987 |
| Jankes Consulting Limited | Professional & scientific | 2023 |
| Janki Medical Limited | Health & social care | 2025 |
| Janriya Ltd | Manufacturing | 2024 |
| Jans London Limited | Professional & scientific | 2021 |
| Jansi Properties Limited | Real estate | 2023 |
| Janus Fine Arts Ltd | Administrative & support | 2022 |
| Janusigan Limited | Wholesale & retail | 2022 |
| Janvi Trading Ltd | Wholesale & retail | 2019 |
| JAP Service Parts Limited | Wholesale & retail | 2015 |
| Japan Blues Ltd | Wholesale & retail | 2016 |
| Japestar Limited | Real estate | 2018 |
| Japp Group Ltd | Real estate | 2020 |
| JAR Property Limited | Real estate | 2023 |
| Jara Designer Studio Limited | Professional & scientific | 2026 |
| Jared Limited | Construction | 2000 |
| Jareen Consulting Limited | Information & communication | 2015 |
| Jaroma Holding Ltd | Financial services | 2023 |
| Jarrett & Co Property Company Limited | Real estate | 2026 |
| Jarrett & Co Trading Company Limited | Financial services | 2025 |
| JAS & Co Property Limited | Real estate | 2025 |
| JAS Impressions Limited | Other services | 2006 |
| Jasar Homes Ltd | Construction | 2023 |
| Jash (BV) Limited | Wholesale & retail | 2006 |
| Jash Healthcare Ltd | Health & social care | 2013 |
| Jasha Group Ltd | Financial services | 2014 |
| Jashetvi Limited | Wholesale & retail | 2024 |
| Jasmin Jani Limited | Information & communication | 2024 |
| Jasmine Court (Hanworth) Management Company Ltd | Households | 2007 |
| Jasmine Dale Nursery Limited | Health & social care | 2021 |
| Jasmine Hills Ltd | Health & social care | 2025 |
| Jasmine's House Ltd | Extraterritorial | 2019 |
| Jaso Stays Ltd | Hospitality | 2024 |
| Jason Welch IT Consultancy Limited | Information & communication | 2018 |
| Jasper Construction Materials UK Ltd | Wholesale & retail | 2025 |
| Jass Commercial Limited | Real estate | 2020 |
| Jass Productions Limited | Professional & scientific | 2012 |
| Jass Property Services Ltd | Real estate | 2016 |
| Jass Property Solutions LLP | | 2022 |
| Jassa Commercial Limited | Real estate | 2025 |
| Jassi Properties Ltd | Real estate | 2021 |
| Jassim Jaffer Sound Limited | Information & communication | 2017 |
| Jassons Limited | Information & communication | 2009 |
| Jastar Capital Limited | Financial services | 2019 |
| Jastar Holdings Limited | Financial services | 2023 |
| JAT Catering Limited | Hospitality | 2023 |
| Jatania Group Limited | Extraterritorial | 2020 |
| Jatania Holdings Limited | Real estate | 2014 |
| Jatania Investments Limited | Construction | 2015 |
| Jatania Property Limited | Construction | 2015 |
| Jattsco Limited | Information & communication | 2012 |
| Jaunatis Ltd | Wholesale & retail | 2025 |
| JAV Solutions Limited | Information & communication | 2004 |
| Java Central Limited | Extraterritorial | 2016 |
| Java Divine Ltd | Hospitality | 2015 |
| Java Wharf Management Limited | Households | 1988 |
| Javan Investments Ltd | Financial services | 2025 |
| Javi Healthcare Ltd | Wholesale & retail | 2020 |
| Javi Property Limited | Construction | 2025 |
| Javiya Trade Ltd | Wholesale & retail | 2025 |
| Jaxani VEG Food Ltd | Wholesale & retail | 2021 |
| Jaxma IT Solutions Ltd | Information & communication | 2008 |
| JAY & I Events Limited | Other services | 2012 |
| JAY Ambe Trading UK Ltd | Transport & logistics | 2024 |
| JAY Bajrang UK Ltd | Wholesale & retail | 2024 |
| JAY Bhavani Harrow Ltd | Hospitality | 2026 |
| JAY Gurudev Ltd | Hospitality | 2025 |
| JAY Hanuman CS Ltd | Construction | 2023 |
| JAY Hari Builders Limited | Construction | 2014 |
| JAY Holdings Limited | Professional & scientific | 2017 |
| JAY Khodiyar Enterprise Ltd | Wholesale & retail | 2025 |
| JAY Madi Ltd | Hospitality | 2026 |
| JAY Mahalaxmi Trading Limited | Wholesale & retail | 2026 |
| JAY Maharaj Trading Ltd Ltd | Administrative & support | 2025 |
| JAY Rajani Limited | Professional & scientific | 1997 |
| JAY Varsani Limited | Arts & recreation | 2018 |
| Jay&Abisha Property Ltd | Real estate | 2026 |
| JAY. K. Investments Ltd | Real estate | 2018 |
| Jaya Horizons Ltd | Wholesale & retail | 2026 |
| Jaya Laxmi Ltd | Wholesale & retail | 2017 |
| Jayaar Impex Limited | Administrative & support | 1979 |
| Jayambe Services Ltd | Wholesale & retail | 2025 |
| Jaybee Fabrics Ltd. | Other services | 1994 |
| Jaycee Subway Limited | Hospitality | 2008 |
| Jayco Financial Solutions Ltd | Financial services | 2016 |
| Jaydh Ltd | Wholesale & retail | 2025 |
| Jayesh Engineering Co UK Ltd | Manufacturing | 2025 |
| Jaygowrie BTL Ltd | Real estate | 2024 |
| Jayishu Limited | Wholesale & retail | 2026 |