| Iwork Consulting Ltd | Information & communication | 2020 |
| IX Music Group Ltd | Arts & recreation | 2018 |
| Ixplore Limited | Financial services | 2004 |
| Izad Limited | Health & social care | 2013 |
| Izzy Logistics Ltd | Wholesale & retail | 2024 |
| J & Friends Limited | Hospitality | 2022 |
| J & J Residents Ltd | Households | 2022 |
| J & JD Retail Ltd | Wholesale & retail | 2019 |
| J & L Auto Limited | Wholesale & retail | 2020 |
| J & M Plastering Solutions Limited | Construction | 2023 |
| J & R Property Developers Limited | Real estate | 2015 |
| J @ D Event Management Limited | Hospitality | 2025 |
| J and S Sales Limited | Information & communication | 2025 |
| J and Y Builders Ltd | Other services | 2018 |
| J C Phipps Ltd | Construction | 2018 |
| J Gilbert Properties LLP | | 2025 |
| J Horton Creative Limited | Professional & scientific | 2025 |
| J J & a a Property Investment Ltd | Real estate | 2022 |
| J P & S Servicess Ltd | Wholesale & retail | 2004 |
| J P Caterers Limited | Hospitality | 2026 |
| J Properties Development Ltd | Construction | 2023 |
| J Sons and Co. Ltd | Construction | 2020 |
| J Sons Construction Limited | Construction | 2022 |
| J Stifford Ltd | Professional & scientific | 2025 |
| J W Moore Property Care Ltd | Construction | 2021 |
| J&B Building Ltd | Construction | 2017 |
| J&B Services Limited Limited | Wholesale & retail | 2024 |
| J&Co Property Ltd | Real estate | 2023 |
| J&E Sofa and Chair Ltd | Wholesale & retail | 2020 |
| J&G Consultantcy Limited | Professional & scientific | 2025 |
| J&J Realty Ltd | Real estate | 2024 |
| J&K Ceiling Ltd | Construction | 2016 |
| J&K Property Trading Limited | Real estate | 2020 |
| J&L Gardening and Landscaping Ltd | Construction | 2024 |
| J&M Cleaning Ltd | Administrative & support | 2024 |
| J&S Consultancy Ltd | Information & communication | 2025 |
| J&V Ltd | Construction | 2019 |
| J&W Fast Food Ltd | Hospitality | 2018 |
| J&W Smiles Limited | Health & social care | 2019 |
| J.J.P. Properties Limited | Real estate | 1997 |
| J.S Electric Services Ltd | Construction | 2018 |
| J145 Ltd | Wholesale & retail | 2020 |
| J1SERVICES Ltd | Construction | 2024 |
| J4L Limited | Manufacturing | 2026 |
| J4V Ltd | Real estate | 2024 |
| J5P Ltd | Professional & scientific | 2011 |
| JA Creative Construction Limited | Construction | 2023 |
| Jaafar Capital Ltd | Health & social care | 2025 |
| Jaago Network Ltd | Construction | 2019 |
| Jaan Digital Limited | Information & communication | 2016 |
| Jabra Limited | Real estate | 2022 |
| Jack and JEN Properties Ltd | Real estate | 2025 |
| Jacob Miles Ltd | Transport & logistics | 2013 |
| Jacobnjoseph Ltd | Wholesale & retail | 2020 |
| Jacota Invest Ltd | Construction | 2023 |
| Jacs of London Ltd | Transport & logistics | 2026 |
| Jacyn Care Ltd | Health & social care | 2013 |
| JAD & Sons Limited | Real estate | 2021 |
| Jade Products Limited | Wholesale & retail | 1991 |
| JAF Property Services LLP | | 2020 |
| JAG Interiors Services Ltd | Construction | 2008 |
| JAG IT Consulting Ltd | Information & communication | 2018 |
| Jag's Beauty Ltd | Other services | 2016 |
| Jagatwani Ltd | Information & communication | 2008 |
| Jags Impex Limited | Wholesale & retail | 2025 |
| Jahangir Properties Limited | Real estate | 2025 |
| Jahouston Group Ltd | Professional & scientific | 2017 |
| JAI Associates Ltd | Manufacturing | 2011 |
| JAI Bhavani Limited | Hospitality | 2023 |
| JAI MAA Khodiyar Ltd | Arts & recreation | 2021 |
| JAI Maharaj Ltd | Other services | 2016 |
| JAI Mata DI Limited | Health & social care | 2023 |
| JAI Shri RAM Accountant Ltd | Professional & scientific | 2025 |
| Jaiditya Electrical Ltd | Construction | 2024 |
| Jainesh IT Solutions Ltd | Information & communication | 2018 |
| Jaisel Ltd | Wholesale & retail | 2026 |
| Jaishik Limited | Real estate | 2023 |
| Jako's CAB Ltd | Wholesale & retail | 2019 |
| Jala Ashish Ltd | Wholesale & retail | 2009 |
| Jala Construction Ltd | Construction | 2017 |
| Jala Four Limited | Wholesale & retail | 2021 |
| Jala News Limited | Wholesale & retail | 2019 |
| Jala One Ltd | Wholesale & retail | 2017 |
| Jala Residential (ASH) Limited | Real estate | 2026 |
| Jala Residential Ltd | Real estate | 2021 |
| Jala Retail Ltd | Wholesale & retail | 2019 |
| Jala Three Limited | Wholesale & retail | 2018 |
| Jala Two Limited | Wholesale & retail | 2018 |
| Jalaram Produce Limited | Wholesale & retail | 2025 |
| Jaleman Ltd | Health & social care | 2014 |
| Jalivi Trading Ltd | Other services | 2023 |
| Jalnam Holding Ltd | Wholesale & retail | 2026 |
| Jalpa Tech Limited | Wholesale & retail | 2025 |
| JAM - ERA Creations Ltd | Information & communication | 2013 |
| JAM and Chill Ltd | Hospitality | 2026 |
| JAM Management Group Limited | Other services | 2018 |
| Jama Associates Ltd | Real estate | 2024 |
| Jamaican Patties Limited | Manufacturing | 1998 |
| Jamali Group UK Ltd | Wholesale & retail | 2024 |
| Jambo Autos Ltd | Wholesale & retail | 2021 |