| J C Camera Systems Limited | Manufacturing | 2018 |
| J H I Properties Ltd | Hospitality | 2013 |
| J H S Properties Limited | Real estate | 2005 |
| J H Traction Limited | Transport & logistics | 2016 |
| J J & J Enterprises Limited | Wholesale & retail | 2000 |
| J J Forklift Services Ltd | Professional & scientific | 2024 |
| J Lane Transport Limited | Transport & logistics | 2022 |
| J Miles [WM] Ltd | Transport & logistics | 2022 |
| J P Fire Ltd | Public administration | 2019 |
| J P Motors Limited | Wholesale & retail | 2004 |
| J Paul Properties Ltd | Real estate | 2026 |
| J R Shopfitters Limited | Construction | 2015 |
| J S Pawars Limited | Construction | 2024 |
| J&D Civils Ltd | Construction | 2025 |
| J. H. Plasterers Ltd | Construction | 2017 |
| J. Jones Interpreting Ltd | Professional & scientific | 2024 |
| J. Nicklin & Sons Limited | Manufacturing | 2014 |
| J.A. Wilkes Building & Home Improvements Ltd | Construction | 2017 |
| J.B. Silo Cleaning Ltd | Administrative & support | 2019 |
| J.D Developments Bayton Limited | Real estate | 2018 |
| J.D. Paving WM Ltd | Construction | 2026 |
| J.D.A. Electrical Ltd | Construction | 2014 |
| J.H.M.C. Flooring Ltd | Construction | 2022 |
| J.N.T. Plastering Ltd | Construction | 2019 |
| J.R. Vehicle Conversions Ltd | Wholesale & retail | 2016 |
| J.T Holdings WM Ltd | Real estate | 2026 |
| J.T.S. Building Services Ltd | Construction | 2024 |
| J9 Cars Trade Ltd | Wholesale & retail | 2025 |
| J9 Collect and Store Limited | Other services | 2022 |
| J9 Locked and Secure Storage Limited | Other services | 2022 |
| J9&JP Limited | Real estate | 2023 |
| Jacob Dabbs Enterprise Ltd | Wholesale & retail | 2026 |
| Jacob Facilities Management Limited | Administrative & support | 2023 |
| Jakab Cleaning Limited | Administrative & support | 2025 |
| Jakzstackz Limited | Manufacturing | 2025 |
| Jalandhar Junction Cafe Ltd | Hospitality | 2026 |
| Jalf Bros Tradelinks International Ltd | Wholesale & retail | 2004 |
| Jamaica Heritage Links Ltd. | Education | 2000 |
| James Bridge Complete Motor Services Ltd | Wholesale & retail | 2017 |
| James Reade Holdings Ltd | Financial services | 2026 |
| Jammin Events Ltd | Arts & recreation | 2023 |
| Japanese PAL Imports Ltd | Wholesale & retail | 2023 |
| Japroop Transport Limited | Transport & logistics | 2022 |
| Jasrotia Transport Ltd | Transport & logistics | 2025 |
| Jass Diamond Coast Ltd | Construction | 2024 |
| Jass Diamond Property Ltd | Real estate | 2026 |
| Jassa Transport Ltd | Transport & logistics | 2023 |
| Jattson Ltd | Transport & logistics | 2023 |
| JAY Fernandez Limited | Wholesale & retail | 2024 |
| Jaytee Care Limited | Health & social care | 2020 |
| JB1 Supplies Limited | Administrative & support | 2023 |
| JBB Construction Ltd | Construction | 2013 |
| JBH Contracting Ltd | Construction | 2025 |
| JDL Contractors Ltd | Construction | 2019 |
| JDS Echo Limited | Health & social care | 2023 |
| Jedi Customs Limited | Wholesale & retail | 2022 |
| Jeevan Records UK Ltd | Information & communication | 2020 |
| Jefferies Construction Ltd | Construction | 2024 |
| Jefferies Utilities Ltd | Construction | 2020 |
| JEM Properties [WM] Ltd | Real estate | 2023 |
| Jennys Studio Limited | Other services | 2013 |
| Jersey Cityscape Ltd | Real estate | 2024 |
| JGB Landscaping & Property Maintenance Ltd | Construction | 2018 |
| JH Plant Hire Ltd | Administrative & support | 2025 |
| JH Scaffolding Services Ltd | Construction | 2023 |
| Jhaines Limited | Health & social care | 2017 |
| JI Star Ltd | Other services | 2023 |
| Jigsaw Supported Living Limited | Health & social care | 2019 |
| JJ & Jade Properties Ltd | Real estate | 2021 |
| JJ Logistix Ltd | Transport & logistics | 2026 |
| JJK Property Rentals Ltd | Real estate | 2022 |
| JK Salhan Transport Ltd | Transport & logistics | 2024 |
| JLA Property Maintenance Limited | Construction | 2024 |
| JLS Electrical Ltd | Construction | 2014 |
| JM Durbin Limited | Wholesale & retail | 2006 |
| JMH Property Investments Limited | Extraterritorial | 2023 |
| JMS Enterprise Limited | Manufacturing | 2011 |
| JMZ Radiology Services Ltd | Health & social care | 2020 |
| JND Shot Blasting Ltd | Manufacturing | 2022 |
| JOB Done Group Ltd | Wholesale & retail | 2026 |
| Jodha Singh Ltd | Construction | 2025 |
| JOE Craig Ltd | Construction | 2024 |
| Johal Property Group Ltd | Real estate | 2025 |
| John Jinks Ltd | Professional & scientific | 2010 |
| John Oates Horseboxes Ltd | Wholesale & retail | 2014 |
| John Peach Transport Limited | Transport & logistics | 2016 |
| Johnson & Starley Limited | Manufacturing | 1922 |
| Johnston Cook Associates Limited | Professional & scientific | 2016 |
| Johnston Dean Construction Limited | Construction | 2022 |
| Johny OWL Ltd | Transport & logistics | 2017 |
| JOI Plastering Ltd | Construction | 2015 |
| Jordans Industrial Services Limited | Construction | 2002 |
| Jose Resells Ltd | Wholesale & retail | 2025 |
| Joyzva Ltd | Health & social care | 2016 |
| Jpiuk Ltd | Wholesale & retail | 2024 |
| JR Equipment Limited | Wholesale & retail | 2025 |
| JRB Social Work Solutions Ltd | Health & social care | 2024 |
| JRL Developments Ltd | Construction | 2024 |
| JS1 Construction Ltd | Construction | 2020 |
| JS1 Properties Ltd | Real estate | 2024 |