| J&M Holmes (IW) Limited | Administrative & support | 2024 |
| J&M Lewis Consultancy Limited | Administrative & support | 2023 |
| J&Pizza Go Ltd | Hospitality | 2026 |
| J&S Cronnelly Ltd | Real estate | 2025 |
| J&S Details Ltd | Administrative & support | 2026 |
| J&Sk Properties Ltd | Real estate | 2022 |
| J'S Baps Ltd | Hospitality | 2023 |
| J-Bub Solutions Ltd | Information & communication | 2021 |
| J.A Converse Ltd | Construction | 2025 |
| J.A. Pro Construction Ltd | Construction | 2016 |
| J.A., R.M. & G.J. Sollis Limited | Extraterritorial | 2008 |
| J.A.Bladeservices Ltd | Manufacturing | 2025 |
| J.D.G Services Ltd | Manufacturing | 2023 |
| J.Green NDT Services Ltd. | Professional & scientific | 2025 |
| J.J. Hancock Decorators Limited | Construction | 2000 |
| J.J.Castings Investments(Heat Treatment)Limited | Manufacturing | 1962 |
| J.L.T. Wines Limited | Wholesale & retail | 2020 |
| J.M. Flooring (IOW) Limited | Construction | 2014 |
| J.M.C Aggregates Limited | Extraterritorial | 2016 |
| J.M.C. AG Limited | Administrative & support | 1989 |
| J.O. Engineering Limited | Manufacturing | 1999 |
| J.O.B. Property Company Limited | Real estate | 1981 |
| J.S. Cleaning Services Limited | Administrative & support | 2004 |
| J.W. Bowkett (Electrical Installations) Limited | Construction | 1984 |
| J14 Services LP | | 2024 |
| J4DE 7 Construction Ltd | Construction | 2021 |
| JA Project Consultant Ltd | Information & communication | 2023 |
| JA11 Promotions Limited | Arts & recreation | 2018 |
| JAC Hairdressing Limited | Other services | 1999 |
| Jacinth Weddings and Events Ltd | Hospitality | 2020 |
| Jack Stamp Blade Repair Training Ltd | Education | 2022 |
| Jack the Giant Storer Ltd | Wholesale & retail | 2016 |
| Jacket Inn Ltd | Hospitality | 2025 |
| Jacklyn Dawson Solicitors LLP | | 2024 |
| Jackson Osborne Limited | Professional & scientific | 2012 |
| Jackson Properties Limited | Real estate | 1996 |
| Jacksons Motor Company Ltd. | Wholesale & retail | 2019 |
| Jacob's Grocery Store Ltd | Wholesale & retail | 2025 |
| Jacoler Limited | Hospitality | 2010 |
| Jacoluzo Ltd | Hospitality | 2025 |
| Jacomina H Limited | Real estate | 2023 |
| Jade Dragon Trading Ltd | Wholesale & retail | 2021 |
| Jades Media C.I.C. | Professional & scientific | 2024 |
| Jadestone (IOW) Recycling Ltd | Water & waste | 2026 |
| Jadestone Holdings Ltd | Financial services | 2025 |
| Jaengsomboon Food Limited | Hospitality | 2025 |
| Jafra Innovations Ltd | Wholesale & retail | 2019 |
| Jagcask Ltd | Financial services | 2025 |
| Jaisvi & Co Limited | Wholesale & retail | 2025 |
| Jakob Fitness Coaching Ltd | Arts & recreation | 2025 |
| Jaks Hairdressing Limited | Other services | 2018 |
| Jalaram Medics Limited | Health & social care | 2022 |
| JAM HR Consulting Limited | Administrative & support | 2015 |
| JAM Tech DEV Ltd | Information & communication | 2021 |
| James a Lewis Limited | Health & social care | 2012 |
| James Carpentry Limited | Construction | 2016 |
| James CT IOW Management Company Ltd | Construction | 2024 |
| James Dallaway Limited | Other services | 2003 |
| James Garage Services Limited | Wholesale & retail | 2002 |
| James Harries Multimedia Ltd | Information & communication | 2019 |
| James Health Care Solution Limited | Health & social care | 2022 |
| James Lineham Media Ltd | Information & communication | 2024 |
| James Muldoon Business Support Ltd | Administrative & support | 2022 |
| James Nader Productions Ltd | Professional & scientific | 2008 |
| James Norvill Properties Limited | Real estate | 2009 |
| James PM Limited | Information & communication | 2025 |
| James Professional Services Limited | Professional & scientific | 2021 |
| James Technical Services Employee Trustee Limited | Professional & scientific | 2024 |
| James Technical Services Limited | Manufacturing | 2001 |
| Jamesbury Projects Ltd | Extraterritorial | 2005 |
| Jamestown Manufacturing UK Limited | Manufacturing | 1998 |
| Jami Investments Ltd | Real estate | 2023 |
| Jamie Allen Touring Ltd | Information & communication | 2025 |
| Jamie Baulch Fitness Limited | Arts & recreation | 2020 |
| Jamie Spartan Rail Ltd | Construction | 2016 |
| Jamieson’S Juice Factory Ltd | Wholesale & retail | 2021 |
| Jamob Care Limited | Public administration | 2026 |
| Jams and Jellies Ltd | Wholesale & retail | 2023 |
| Jamuna Constructions Ltd | Construction | 2026 |
| JAN Therapies Limited | Other services | 2022 |
| Janal Limited | Wholesale & retail | 1998 |
| Jane Mottershead Designs Limited | Professional & scientific | 2002 |
| Janet John Limited | Professional & scientific | 2006 |
| Jankosambou Ltd | Health & social care | 2020 |
| Jarmany Productions Limited | Information & communication | 2016 |
| Jarmprop Ltd | Real estate | 2019 |
| Jasmart (IOW) Ltd | Wholesale & retail | 2026 |
| Jasmine-Rose Bridal Limited | Wholesale & retail | 2015 |
| Jason Green Carpentry Limited | Construction | 2019 |
| Jason Price Limited | Professional & scientific | 2019 |
| Jasper Stanley Limited | Arts & recreation | 2010 |
| JAT Stores Ltd | Wholesale & retail | 2015 |
| Javore Ltd | Extraterritorial | 2003 |
| Jay's Car Repairs Limited | Wholesale & retail | 2014 |
| Jaydeez Ltd | Wholesale & retail | 2023 |
| Jayem Joinery Limited | Construction | 2002 |
| Jayne Lettings Limited | Real estate | 2024 |
| Jaysim Probuild Ltd | Construction | 2025 |
| Jaytee Group Limited | Financial services | 2022 |
| Jaytee Property Investments Limited | Real estate | 2022 |