| ITS Tyres Ltd | Wholesale & retail | 2026 |
| Iver 13 Ltd | Real estate | 2020 |
| Iver Plot 10 Limited | Real estate | 2020 |
| IVO Textiles Limited | Manufacturing | 2004 |
| Ivory Homes Ltd | Professional & scientific | 2019 |
| IVY Haven Properties Ltd | Real estate | 2024 |
| Izzy Home Furnishing Ltd | Wholesale & retail | 2020 |
| Izzy Home Store Limited | Wholesale & retail | 2015 |
| J & H Products Ltd | Wholesale & retail | 2025 |
| J & P Traders Ltd | Other services | 2024 |
| J & S Grover Limited | Real estate | 2018 |
| J & T Foods Ltd | Wholesale & retail | 2015 |
| J and Meet Traders Ltd | Wholesale & retail | 2026 |
| J Angel Construction Ltd | Construction | 2022 |
| J B Healthcare Services Limited | Health & social care | 2005 |
| J Barclay Ltd | Financial services | 2021 |
| J Construction Ltd | Construction | 2022 |
| J D Multani Ltd | Transport & logistics | 2023 |
| J G T D Restaurants Limited | Hospitality | 2011 |
| J J S Builders Ltd | Construction | 2020 |
| J K London Builders Ltd | Construction | 2025 |
| J P Investments London Ltd | Real estate | 2004 |
| J S Home Improvements London Limited | Construction | 2020 |
| J&E Online Traders Ltd | Wholesale & retail | 2018 |
| J&H Jewels Limited | Wholesale & retail | 2025 |
| J&J Food & Wine Ltd | Wholesale & retail | 2018 |
| J&K Tech Limited | Information & communication | 2020 |
| J&L Smart Supplies Ltd | Wholesale & retail | 2020 |
| J&S Developers Ltd | Construction | 2017 |
| J-Go Media | Information & communication | 2017 |
| J.J Roofing & Construction Ltd | Construction | 2024 |
| J.J. Cheney Limited | Manufacturing | 1991 |
| J.J.2 Construction Ltd | Construction | 2023 |
| J.R. Painters and Decorators Ltd | Other services | 2019 |
| J.R.S. Express Limited | Transport & logistics | 1997 |
| J.S. Fruit and VEG. Limited | Wholesale & retail | 2015 |
| J.S.G. (UK) Limited | Wholesale & retail | 2006 |
| J3S Mart Ltd | Wholesale & retail | 2026 |
| J9 Services Ltd | Transport & logistics | 2026 |
| J9 YUV Investments Limited | Real estate | 2023 |
| Jaatxpress Ltd | Transport & logistics | 2025 |
| JAG Refurbishers Limited | Construction | 2014 |
| Jagan Nath Ltd | Real estate | 2025 |
| Jagga Brickwork Limited | Construction | 2025 |
| Jagir Contractor Ltd | Construction | 2024 |
| Jagmama Limited | Wholesale & retail | 2019 |
| Jagraj Limited | Transport & logistics | 2025 |
| Jagrajproperty Ltd | Administrative & support | 2017 |
| Jagraon Property Ltd | Real estate | 2011 |
| JAI Couriers Ltd | Transport & logistics | 2024 |
| JAI MAA Ltd | Construction | 2019 |
| Jaigo Ltd | Professional & scientific | 2010 |
| Jaijon Solutions Ltd. | Construction | 2017 |
| Jainti Architects Limited | Professional & scientific | 2025 |
| Jainti Cake & Food Ltd | Wholesale & retail | 2025 |
| Jainti Properties Ltd | Real estate | 2022 |
| Jaitaj Trucking Services Ltd | Construction | 2023 |
| Jajj Construction Ltd | Other services | 2018 |
| Jalal Fresh Fruit Ltd | Wholesale & retail | 2021 |
| JAM UK Cars Hire Ltd | Transport & logistics | 2018 |
| JAM UK Cars Trading Ltd | Wholesale & retail | 2018 |
| Jamal Agency Limited | Administrative & support | 2019 |
| James Lloyd Limited | Education | 2015 |
| Jamil Jewellers Ltd | Manufacturing | 2023 |
| Jamuna Curry House Limited | Hospitality | 2016 |
| JAN Meat Limited | Wholesale & retail | 2015 |
| Jandor Estates Ltd | Real estate | 2023 |
| Janeet Limited | Real estate | 2025 |
| Janet Contractors Limited | Construction | 2021 |
| Jantar Mantar Limited | Information & communication | 2025 |
| Janusz Construction Ltd | Construction | 2024 |
| Janvi Fashion Ltd | Manufacturing | 2020 |
| JAP JI Investments Ltd | Real estate | 2017 |
| Japtrade Ltd | Wholesale & retail | 2023 |
| Jaria FM Services Limited | Administrative & support | 2024 |
| Jaria Services Limited | Administrative & support | 2026 |
| Jarish Food Ltd | Hospitality | 2024 |
| JAS Builders Limited | Construction | 2022 |
| JAS Builders London Ltd | Construction | 2022 |
| JAS Empire Limited | Financial services | 2020 |
| JAS Food & Wine Limited | Wholesale & retail | 2011 |
| JAS Jewellery Limited | Other services | 2024 |
| JAS Musicals Limited | Manufacturing | 1991 |
| JAS Travels Limited | Administrative & support | 2001 |
| JAS UK Properties Limited | Real estate | 2026 |
| Jasgill Properties Ltd | Real estate | 2025 |
| Jasirat Investment Ltd | Wholesale & retail | 2026 |
| Jasmeet and Satvir Investments Limited | Real estate | 2026 |
| Jasmeet Ltd | Construction | 2026 |
| Jasmeet Transport Ltd | Transport & logistics | 2023 |
| Jasmine Supported Care Ltd | Health & social care | 2025 |
| Jasneet Fashion Ltd | Wholesale & retail | 2024 |
| Jaspreet Ltd | Construction | 2026 |
| Jaspreetjasprit Ltd | Professional & scientific | 2018 |
| Jass E-Commerce Ltd | Wholesale & retail | 2023 |
| Jass Momi Construction Limited | Construction | 2023 |
| Jassale Properties Ltd | Real estate | 2025 |
| Jassi Concrete Finisher Ltd | Construction | 2023 |
| Jassi Gata-Aura Ltd | Professional & scientific | 2018 |
| Jass’S Brickwork Ltd | Construction | 2025 |