| Jagged Globe (Climb Trek SKI) Ltd | Administrative & support | 2009 |
| Jagger P&M Ltd | Real estate | 2026 |
| Jagger Transport Limited | Transport & logistics | 2026 |
| Jagielski Waldek Ltd | Real estate | 2024 |
| Jaguar Estates Investments Limited | Real estate | 2009 |
| Jaguar Estates Limited | Construction | 1987 |
| Jaguar Homes Limited | Construction | 2007 |
| Jaguar Management Company (Holdings) Limited | Households | 2019 |
| Jaguar Property Limited | Construction | 2003 |
| Jaguar Residential Limited | Real estate | 1997 |
| Jaguar Trading Ltd | Wholesale & retail | 2017 |
| Jagz General Services Ltd | Real estate | 2025 |
| Jahan Property Ltd | Real estate | 2023 |
| Jahs OFF Licence Ltd | Wholesale & retail | 2024 |
| JAI RAJ Investments Ltd | Real estate | 2007 |
| JAI SAI Holdings Limited | Real estate | 2025 |
| Jaipur Tandoori House Ltd | Hospitality | 2026 |
| Jairag RAI Limited | Hospitality | 2024 |
| Jajuma Ltd | Professional & scientific | 2003 |
| JAK PAK Ltd | Wholesale & retail | 2020 |
| Jakb Accounting & Business Services Ltd | Professional & scientific | 2013 |
| Jake & Co Capital Ltd | Real estate | 2020 |
| Jake & Co Properties Ltd | Real estate | 2017 |
| Jake Bell Limited | Transport & logistics | 2024 |
| Jake Cathcart Business Consultancy Ltd | Professional & scientific | 2023 |
| Jake Cathcart Coaching Ltd | Education | 2022 |
| Jake Meays Business Consultancy Ltd | Professional & scientific | 2025 |
| Jake Meays Coaching Ltd | Other services | 2024 |
| Jake Millward Services Ltd | Arts & recreation | 2025 |
| Jake's Quiz Ltd | Professional & scientific | 2021 |
| Jakemond Accountancy Limited | Professional & scientific | 2014 |
| JAL Bookings Limited | Real estate | 2025 |
| JAL Consulting Ltd. | Information & communication | 2015 |
| Jaleh Ltd | Wholesale & retail | 2021 |
| Jalp Ltd | Other services | 2022 |
| JAM (South Yorkshire) Ltd | Construction | 2016 |
| JAM 300 Limited | Wholesale & retail | 2004 |
| JAM Artworks Ltd | Professional & scientific | 2022 |
| JAM Contracting Limited | Construction | 2007 |
| JAM Developers LLP | | 2013 |
| JAM Engineering Ltd | Professional & scientific | 2026 |
| JAM Oakbrook Limited | Other services | 2012 |
| JAM Product Design Ltd | Professional & scientific | 2020 |
| JAM Spoon Limited | Hospitality | 2019 |
| JAM Structural Design Ltd. | Professional & scientific | 2018 |
| Jamaica Food Sheffield Ltd | Hospitality | 2023 |
| Jambar Saas Limited | Information & communication | 2026 |
| Jambar Technologies Ltd | Information & communication | 2025 |
| Jamco Media Limited | Arts & recreation | 2023 |
| James & Smith Builders Limited | Construction | 2011 |
| James Amazon Ltd | Wholesale & retail | 2024 |
| James Andrew Court Limited | Households | 1977 |
| James Baron Properties Limited | Financial services | 2019 |
| James Bird Landscapes Limited | Administrative & support | 2004 |
| James Bird Properties Limited | Real estate | 2017 |
| James Boid Limited | Information & communication | 2012 |
| James Boot Design Ltd. | Construction | 2014 |
| James Brocklebank Ltd | Administrative & support | 2009 |
| James Brodie Editorial Limited | Arts & recreation | 2022 |
| James Brunt Artist Limited | Arts & recreation | 2015 |
| James Craggs Equine Services Ltd | Agriculture & fishing | 2026 |
| James D. Gibson & Company Limited | Manufacturing | 1970 |
| James Davison Personal Security Limited | Administrative & support | 2021 |
| James Dixon & Sons Limited | Professional & scientific | 2025 |
| James Durrans & Sons,Limited | Manufacturing | 1920 |
| James Durrans (Transport) Limited | Professional & scientific | 1973 |
| James Durrans Holdings Limited | Financial services | 2019 |
| James Durrans Power Process Limited | Manufacturing | 2021 |
| James Edward Hartley Ltd | Professional & scientific | 2004 |
| James Electrix Ltd | Construction | 2024 |
| James Engineering Constructions Limited | Professional & scientific | 2010 |
| James Engineering Limited | Financial services | 2021 |
| James Goff (Plumbing & Heating Services) Limited | Construction | 2005 |
| James Hadley Limited | Wholesale & retail | 2013 |
| James Hayes FS Ltd | Financial services | 2021 |
| James Holland Properties Limited | Real estate | 2015 |
| James Kirk Creative Limited | Administrative & support | 2017 |
| James M Garnett Consulting Limited | Information & communication | 2023 |
| James Miller Consulting Limited | Information & communication | 2015 |
| James Murphy Photographer Limited | Extraterritorial | 2012 |
| James Murphy Photography Limited | Administrative & support | 1994 |
| James Neill (Napier Street) Limited | Extraterritorial | 1997 |
| James Neill (Services) Limited | Extraterritorial | 1997 |
| James Neill (Sheffield) Limited | Extraterritorial | 1997 |
| James Neill Holdings Limited | Financial services | 1916 |
| James Neill Tools Limited | Extraterritorial | 1997 |
| James P Maginnis Limited | Manufacturing | 1943 |
| James Primhak Design Ltd | Information & communication | 2014 |
| James Properties Derbyshire Limited | Real estate | 2024 |
| James Ridgway Consulting Limited | Information & communication | 2019 |
| James Robert Ltd | Construction | 2016 |
| James Samuel Coaching Ltd | Education | 2024 |
| James Stoddard Orthopaedics Limited | Health & social care | 2015 |
| James the Designer Ltd | Arts & recreation | 2016 |
| James Totty Partnership LLP | | 2017 |
| James Wood Joinery and Property Maintenance Ltd | Construction | 2026 |
| James Wood Properties Ltd | Construction | 2005 |
| James Yorkshire Property Limited | Real estate | 2025 |
| James&Son's Estates Ltd | Real estate | 2026 |
| Jamesandsue Limited | Hospitality | 2022 |