| Ivanlee Designs Ltd | Information & communication | 2013 |
| Ivar (CAS) Ltd | Wholesale & retail | 2023 |
| Iverley Limited | Real estate | 2021 |
| Iverna Gardens Residents Association Limited | Households | 1976 |
| Iverson Road Management Ltd | Real estate | 2016 |
| Ivogreen Investments Ltd | Construction | 2023 |
| Ivory Sky Limited | Real estate | 2026 |
| IVU Tilling Ltd | Construction | 2022 |
| IVY Farm Staycation Ltd | Hospitality | 2023 |
| IVY SA Ltd | Real estate | 2026 |
| IXI Capital Investment Limited | Professional & scientific | 2022 |
| Izgara Restaurant Limited | Hospitality | 2021 |
| IZO Limited | Real estate | 2000 |
| J & B IT Consulting Limited | Administrative & support | 2010 |
| J & D Consultancy Limited | Administrative & support | 2010 |
| J & H (London) Ltd | Wholesale & retail | 2011 |
| J & K Estates (London) Ltd | Real estate | 2017 |
| J & M Hamper Limited | Other services | 2015 |
| J & S Building & Electrical Ltd | Construction | 2020 |
| J a Courier and Logistics Ltd | Transport & logistics | 2026 |
| J Ahmadi Limited | Wholesale & retail | 2026 |
| J Beauty Therapy Ltd | Health & social care | 2025 |
| J Civil's Limited | Construction | 2018 |
| J F Solutions Ltd | Wholesale & retail | 2016 |
| J G River Wealth Management Ltd | Financial services | 2019 |
| J M Lakeview Limited | Real estate | 2009 |
| J Mcfadden Contracts Ltd | Construction | 2007 |
| J Mcgowan Limited | Construction | 2012 |
| J N Jewellery Limited | Administrative & support | 1995 |
| J P D Engineering Ltd | Construction | 2025 |
| J S Gogate Power System Engineering Limited | Professional & scientific | 2022 |
| J S Thurai Retail Ltd | Manufacturing | 2016 |
| J T Automotives Limited | Wholesale & retail | 2011 |
| J Y Productions Ltd. | Arts & recreation | 2003 |
| J&A Best Properties Limited | Real estate | 2025 |
| J&G Accountants Group Ltd | Professional & scientific | 2022 |
| J&J Brothers Limited | Real estate | 2024 |
| J&J Capital Ltd | Real estate | 2019 |
| J&J Solutions Ltd | Professional & scientific | 2014 |
| J. L. Heating & Plumbing Limited | Construction | 2018 |
| J. Stores Ltd | Wholesale & retail | 2010 |
| J.O.G Investments Limited | Real estate | 2015 |
| J.Rumney Tech Limited | Professional & scientific | 2025 |
| JA Sammut Design Limited | Professional & scientific | 2025 |
| JA57 WSH Limited | Manufacturing | 2024 |
| Jaani Logistics Ltd | Transport & logistics | 2026 |
| Jacanasys Limited | Administrative & support | 2014 |
| Jacanjo Limited | Real estate | 2024 |
| Jack & Bura Plastering Ltd | Construction | 2026 |
| Jack Arnold Music Limited | Arts & recreation | 2017 |
| Jack Gibbs Heating and Plumbing Limited | Construction | 2008 |
| Jack Tree Limited | Hospitality | 2022 |
| Jacob Mobile Homes Limited | Hospitality | 2020 |
| Jacqui Farrants Limited | Health & social care | 2016 |
| Jade Property Lettings Ltd | Real estate | 2017 |
| Jade Spring Forese Ltd | Hospitality | 2026 |
| Jadesy Limited | Hospitality | 2012 |
| Jaffna Property Group Ltd | Real estate | 2021 |
| Jaffna Retail & Wholesale Ltd | Wholesale & retail | 2025 |
| Jaiyejaiye Limited | Wholesale & retail | 2023 |
| Jajc Properties Limited | Real estate | 2017 |
| Jaktrans Ltd | Construction | 2012 |
| Jalore Limited | Professional & scientific | 2015 |
| Jalsa Ltd | Hospitality | 2012 |
| Jalside Limited | Real estate | 1966 |
| Jalsin Limited | Professional & scientific | 2025 |
| JAM & P Marketing Limited | Extraterritorial | 2024 |
| Jamblue Patty Limited | Hospitality | 2019 |
| James Fisher Photography Ltd | Professional & scientific | 2015 |
| James Knight Developments Ltd | Financial services | 2007 |
| James Norman Holding Limited | Financial services | 2023 |
| James Philip Imports Limited | Wholesale & retail | 2024 |
| Jamil Mangal Travel & Tours Limited | Administrative & support | 2012 |
| Jamilabab Limited | Wholesale & retail | 2019 |
| JAN Supplies Ltd | Wholesale & retail | 2021 |
| Jan's Handyman Service Ltd | Other services | 2020 |
| Jan's Property Maintenance Ltd | Other services | 2025 |
| Jangam Services Ltd | Construction | 2024 |
| JANI91 Ltd | Construction | 2017 |
| Jans Cars Ltd | Wholesale & retail | 2026 |
| Jans Real Estates Ltd | Real estate | 2025 |
| Jansel Consultancy Limited | Real estate | 1994 |
| Japanese KOI Ltd | Agriculture & fishing | 2021 |
| JAR Retail Limited | Wholesale & retail | 2022 |
| Jard Enterprises Limited | Arts & recreation | 2012 |
| Jarrah Honey (UK) Limited | Wholesale & retail | 2017 |
| Jass Motor Trade Ltd | Wholesale & retail | 2026 |
| Javi Investments Limited | Real estate | 2024 |
| Jaxon Constructions Limited | Construction | 2024 |
| JAY and Diyana Ltd | Construction | 2020 |
| JAY Maharaj Food Limited | Hospitality | 2025 |
| Jaydee Investments Ltd | Financial services | 2022 |
| Jaygrove Limited | Real estate | 2003 |
| Jayke Consultants Ltd | Professional & scientific | 2023 |
| Jayna Chrysalis Properties Limited | Real estate | 2024 |
| Jaypharma Ltd | Health & social care | 2019 |
| Jayvee & Co. Ltd | Professional & scientific | 2000 |
| Jazpharm Limited | Wholesale & retail | 2015 |
| JB Fruits and Vegetables Ltd | Wholesale & retail | 2024 |
| JB Nails 123 Ltd | Other services | 2026 |