| Jinyi Vehicle Co., Ltd | Wholesale & retail | 2022 |
| Jiuhang Import and Export Co., Ltd | Extraterritorial | 2018 |
| JJ Dewsbury Bakery Limited | Wholesale & retail | 2015 |
| JJ Interior Contracts Ltd | Construction | 2022 |
| JJ Vogue Trading Limited | Wholesale & retail | 2024 |
| Jjbn Logistics Ltd | Transport & logistics | 2017 |
| Jjclean-Core Limited | Administrative & support | 2026 |
| Jjdq Limited | Hospitality | 2024 |
| JJT Utilities Ltd | Construction | 2017 |
| JJX2 Ltd | Extraterritorial | 2024 |
| JK Homes Limited | Real estate | 2021 |
| JK Outdoor Solutions Ltd | Manufacturing | 2018 |
| JKB Hospitality Ltd | Hospitality | 2025 |
| Jkdcorporation Limited | Construction | 2025 |
| JKG Plumbing & Heating Limited | Construction | 2017 |
| Jkma Originals Limited | Manufacturing | 2019 |
| JKN Packaging Products Co., Ltd | Wholesale & retail | 2023 |
| JKS Karate Ltd | Education | 2010 |
| JL Flamingo Trading Co. Ltd | Manufacturing | 2020 |
| JLK Accounting Limited | Professional & scientific | 2020 |
| JLO Textiles Ltd | Wholesale & retail | 2019 |
| JM Fitness Aldgate Studio Limited | Arts & recreation | 2016 |
| JM Fitness Employment Co. Limited | Arts & recreation | 2017 |
| JM Fitness Enterprises Limited | Arts & recreation | 2016 |
| JM Fitness Franchise Limited | Arts & recreation | 2016 |
| JM Fitness Studios Limited | Arts & recreation | 2016 |
| JM Fitness Winchester Studio Limited | Arts & recreation | 2016 |
| JMB Services Ltd | Professional & scientific | 2017 |
| JMC Coaching and Consultancy Ltd | Education | 2022 |
| JMD Race Engineering Limited | Wholesale & retail | 2020 |
| JMH Residential Ltd | Real estate | 2021 |
| JMT Electrical Solutions Ltd | Construction | 2022 |
| JMT GAS Ltd | Construction | 2024 |
| Jmuu Limited | Wholesale & retail | 2020 |
| JN Flooring Ltd | Construction | 2023 |
| JN Hoofcare Limited | Agriculture & fishing | 2024 |
| JO Plowright & Co (Chartering) Ltd | Extraterritorial | 2019 |
| JO Plowright & Co (Tankers) Ltd | Extraterritorial | 2019 |
| JO Plowright & Co Ltd | Professional & scientific | 2019 |
| Jobson Holdings Limited | Financial services | 2020 |
| Jobsons Solicitors Limited | Professional & scientific | 2011 |
| Jobstafeten Ltd | Professional & scientific | 2023 |
| Jocempees-Uk Limited | Wholesale & retail | 2025 |
| John Evans & Co Enterprise Limited | Wholesale & retail | 2021 |
| John Moore (Tractor Parts) Limited | Extraterritorial | 2018 |
| John Moore Properties Limited | Real estate | 2018 |
| John Moore Trading Limited | Manufacturing | 2018 |
| John Norfolk Architects Limited | Professional & scientific | 2015 |
| John Palmer Limited | Professional & scientific | 2006 |
| John Reeves Waste Management Limited | Water & waste | 2004 |
| Johnson Fencing Ltd | Construction | 2003 |
| Johnson Stratton Services Ltd | Construction | 2026 |
| Johny Todd Ltd | Arts & recreation | 2017 |
| Jola Medical Ltd | Professional & scientific | 2018 |
| Jolbconsultancy Limited | Professional & scientific | 2023 |
| Jolley Properties Ltd | Real estate | 2017 |
| Jolpool Farming Limited | Agriculture & fishing | 2012 |
| Jolshaa Stafford Ltd | Hospitality | 2018 |
| Joltnest Limited | Wholesale & retail | 2025 |
| JON Burdekin Fleet Consulting Ltd | Administrative & support | 2019 |
| JON Quilliam (2023) Limited | Financial services | 2023 |
| Jonathan Cherry Studio Limited | Professional & scientific | 2016 |
| Jonathan Green Property Consultancy Limited | Professional & scientific | 2024 |
| Jonathan Lloyd Commercial Salvage Limited | Wholesale & retail | 1998 |
| Jonathan Lloyd Developments Limited | Construction | 2001 |
| Jonathan Lloyd Holdings Limited | Wholesale & retail | 2019 |
| Jonathan Lloyd Properties Limited | Construction | 2013 |
| Jones & Alcock Limited | Wholesale & retail | 1958 |
| Jones Head Technology UK Limited | Wholesale & retail | 2021 |
| Jones of Penkridge Limited | Administrative & support | 2025 |
| Jones Property Maintenance Limited | Construction | 2026 |
| Jory & Co Design Limited | Professional & scientific | 2012 |
| Josh Bell Fitness Limited | Education | 2023 |
| Joshua Anthony James Carroll Limited | Extraterritorial | 2025 |
| Jounetsu Consulting Limited | Professional & scientific | 2017 |
| Journeys Aligned Ltd | Administrative & support | 2025 |
| Joustford Limited | Construction | 1989 |
| JP 200 Limited | Hospitality | 2023 |
| JP Electric Services Ltd | Construction | 2011 |
| JP Electrical Installations Limited | Construction | 2016 |
| JP Keates & SON Ltd | Other services | 2014 |
| JPJ Ultracare Limited | Health & social care | 2018 |
| JPW1 Ltd | Transport & logistics | 2025 |
| JRB Staffs Ltd | Transport & logistics | 2024 |
| JRC Property (Stafford) Limited | Real estate | 2023 |
| JRJ Builders and Property Management Ltd | Construction | 2023 |
| JRJ Developers Ltd | Construction | 2023 |
| JRJ Homes (Investments) Ltd | Real estate | 2020 |
| JS (Bargin Booze) Ltd | Wholesale & retail | 2021 |
| JS Building & Landscaping Limited | Construction | 2008 |
| Js&Cd Ltd | Wholesale & retail | 2014 |
| JSA Contractors Limited | Construction | 1999 |
| JSC HR Consultancy Ltd | Administrative & support | 2015 |
| Jscp Limited | Financial services | 2025 |
| JSD Healthcare Ltd | Public administration | 2023 |
| JSG Property Ltd | Real estate | 2024 |
| JSH Education Services Limited | Education | 2023 |
| JSK Elite Developments Ltd | Real estate | 2024 |
| JSY Holdings Limited | Financial services | 2018 |
| JT Creative & Education Services Ltd | Education | 2025 |