| J P Plastics Limited | Manufacturing | 2011 |
| J PAL Construction Ltd | Construction | 2022 |
| J R a Developments Limited | Construction | 2019 |
| J Sehaj Limited | Transport & logistics | 2024 |
| J T B Pressings Limited | Manufacturing | 1990 |
| J Tilt Limited | Hospitality | 2014 |
| J W G Machinery & Tool Co. Limited | | 1982 |
| J&A Asbestos Removal Specialists Limited | Other services | 2017 |
| J&C Legacy Estates Ltd | Real estate | 2023 |
| J&S Painters Ltd | Construction | 2019 |
| J.E.W. Ltd | Hospitality | 2024 |
| J.T.Jarvis & SON Limited | Wholesale & retail | 1952 |
| JA Carriage Masters Ltd | Administrative & support | 2025 |
| Jabsuperstore Ltd | Wholesale & retail | 2020 |
| Jacked Racewear Limited | Wholesale & retail | 2019 |
| Jacob Griffiths Ltd | Real estate | 2022 |
| Jade Garden (99) Limited | Hospitality | 2025 |
| Jagdish Builders Ltd | Construction | 2023 |
| Jags Courier Limited | Transport & logistics | 2025 |
| Jag’S Electrical Limited | Construction | 2025 |
| Jaishivom Consulting Limited | Professional & scientific | 2019 |
| Jaison Healthcare Limited | Health & social care | 2018 |
| James Gurney(Ideas)Limited | | 1965 |
| Jamtsd Consultancy Limited | Professional & scientific | 2026 |
| JAN Click Flooring Ltd | Wholesale & retail | 2023 |
| JAN Click Flooring Wholesale Ltd | Wholesale & retail | 2023 |
| JAS Bakery Ltd | Manufacturing | 2026 |
| JAS Builders and Plastering Ltd | Construction | 2020 |
| JAS Events Limited | Administrative & support | 2021 |
| Jaskaran Singhh Ltd | Construction | 2026 |
| Jason Mark Turner Ltd | Administrative & support | 2023 |
| Jass Catering Ltd | Hospitality | 2019 |
| JAT Commerce Ltd | Wholesale & retail | 2025 |
| Jats Properties Ltd | Real estate | 2025 |
| Jay's ALL Day Diner Ltd | Hospitality | 2025 |
| Jaymarl Limited | Health & social care | 2019 |
| JC Autos and MOT Limited | Wholesale & retail | 2024 |
| JC Surfacing and Construction Ltd | Construction | 2019 |
| JD Goods Transport Ltd | Transport & logistics | 2017 |
| JD7 Services Limited | Construction | 2023 |
| JDH Solicitors Ltd | Administrative & support | 2021 |
| JDH Trans Limited | Transport & logistics | 2024 |
| Jeenashire Limited | Professional & scientific | 1974 |
| Jennifer Ashe & SON Florists Ltd | Wholesale & retail | 2023 |
| Jennifer Ashe & SON Funeral Directors Ltd. | Other services | 2016 |
| Jennifer Ashe & SON Memorial Masons Ltd | Other services | 2023 |
| Jennifer Ashe & SON Vehicle Hire Ltd | Administrative & support | 2023 |
| Jerk & Thyme Ltd | Hospitality | 2024 |
| JG Tamber Ltd | Transport & logistics | 2024 |
| JH Upholstery Limited | Manufacturing | 2024 |
| JIT Laboratories Limited | Wholesale & retail | 2003 |
| JJ Construction and Landscape Ltd | Construction | 2020 |
| JJ GAS, Heating and Electric Ltd | Construction | 2023 |
| JJ Sewing UK Limited | Manufacturing | 2020 |
| JLG Developments Ltd | Real estate | 2023 |
| JM Garage Limited | Wholesale & retail | 2025 |
| JMC Technologies Limited | Wholesale & retail | 2008 |
| JMK Entertainment Ltd | Arts & recreation | 2024 |
| Joanne Corkery Ltd | Administrative & support | 2008 |
| JOC PRC UK Ltd | Professional & scientific | 2017 |
| Jodh Transport Ltd | Transport & logistics | 2022 |
| Johal Courier Services Ltd | Transport & logistics | 2025 |
| Johal Property Services 2012 Limited | Real estate | 2010 |
| John Ashe Funeral Directors Ltd | Other services | 2021 |
| John Yates & Co.Limited | Extraterritorial | 1933 |
| John's Tiling Services Ltd | Construction | 2016 |
| Johnson Roofing Services Ltd | Construction | 2020 |
| Joinery Supplies Ltd | Manufacturing | 2015 |
| Jones & Wilkinson Limited | Manufacturing | 1965 |
| Jorawar Logistics Ltd | Transport & logistics | 2024 |
| Josiah Parkes & Sons Limited | Extraterritorial | 1961 |
| Joyfab Limited | Health & social care | 2023 |
| Jpmit Limited | Information & communication | 2017 |
| JQ Jewellery Ltd | Wholesale & retail | 2024 |
| JS Coaching Ltd | Other services | 2019 |
| JS Dhillon Service Ltd | Transport & logistics | 2024 |
| JS Home Construction Ltd | Construction | 2023 |
| JS Sandhu Transport Services Ltd | Transport & logistics | 2020 |
| JSK Transport Ltd | Extraterritorial | 2024 |
| JSL Housing Ltd | Real estate | 2023 |
| JSR 247 Limited | Construction | 2017 |
| JSR Houses Ltd | Real estate | 2020 |
| JST Transport Limited | Transport & logistics | 2024 |
| JTB Midlands Limited | Other services | 2010 |
| JTJ Catering Ltd | Hospitality | 2024 |
| JTL Transport Limited | Transport & logistics | 2019 |
| Jugroop Ghotra Ltd | Transport & logistics | 2022 |
| Jules Business Coach Limited | Administrative & support | 2019 |
| Junction 11 Tyre Express Limited | Wholesale & retail | 2026 |
| JWS Property Services (W'Hall) Ltd | Construction | 2011 |
| JYS1 Ltd | Transport & logistics | 2025 |
| K S Freight Ltd | Transport & logistics | 2023 |
| K & R Barber Ltd | Other services | 2025 |
| K Kerr Ltd | Construction | 2025 |
| K L Engineering (UK) Limited | Professional & scientific | 2009 |
| K S Home Improvements Limited | Construction | 2013 |
| K Shelton Enterprises Limited | Hospitality | 2024 |
| K Star Barber Shop Ltd | Other services | 2024 |
| K-Electrics (Midlands) Ltd | Construction | 2020 |
| K-Tec Ecommerce Limited | Wholesale & retail | 2022 |