| JMJ Asset Management Ltd | Real estate | 2025 |
| JMJ Fabrications Ltd | Manufacturing | 2009 |
| Jmjh Property Ltd | Construction | 2026 |
| JMK Designs Limited | Wholesale & retail | 2008 |
| JML Site Engineers Ltd | Construction | 2017 |
| JMM Financial Services Limited | Professional & scientific | 2015 |
| Jmml Ltd | Real estate | 2025 |
| JMS Catering Equipment Limited | Wholesale & retail | 2025 |
| JMS Garage Services Ltd | Wholesale & retail | 2006 |
| JMS Groundworks Limited | Construction | 2013 |
| JMS Marketing Consultancy Ltd | Professional & scientific | 2024 |
| JMS Professional Services Ltd | Professional & scientific | 2023 |
| JNJ Property Group Ltd | Professional & scientific | 2023 |
| JNK Aesthetics Ltd | Other services | 2023 |
| JNV Limited | Manufacturing | 2015 |
| JOB Done Ltd | Water & waste | 2023 |
| Jobdone Property Care Ltd | Construction | 2026 |
| Jobib Ltd | Wholesale & retail | 2025 |
| Jockey Club Enterprises Limited | Extraterritorial | 2004 |
| Jockey Club Racecourses (Holdings) Limited | Professional & scientific | 1964 |
| Jockey Club Racecourses Limited | Arts & recreation | 1994 |
| Jockey Club Services Limited | Administrative & support | 2013 |
| Jocose Ltd | Manufacturing | 2021 |
| Jodi Brooks Beauty Ltd | Other services | 2018 |
| Jodie Fraser Limited | Professional & scientific | 2024 |
| JOE Ford Landscapes Limited | Administrative & support | 2016 |
| JOE Gilder Metal Recycling Ltd | Water & waste | 2018 |
| Joe's Caring Hands Ltd | Health & social care | 2025 |
| Joel Payne Trading Ltd | Financial services | 2024 |
| John D Jackson Limited | Construction | 2019 |
| John Elwes Limited | Construction | 2017 |
| John Forbes House Management Limited | Households | 1995 |
| John Gordons (Cheltenham) Limited | Hospitality | 2006 |
| John Hackling (Transport) Limited | Transport & logistics | 1964 |
| John Hampshire Property Ltd | Financial services | 2024 |
| John Hughes (Bookmakers) Limited | Arts & recreation | 1998 |
| John Morgan Partnership Limited | Financial services | 2008 |
| John Paul Security Ltd | Administrative & support | 2025 |
| John R Lucas Consulting Limited | Information & communication | 2008 |
| John Skinner (Manufacturing) Limited | Manufacturing | 1983 |
| John Welch & Stammers Solicitors LLP | | 2023 |
| John's Houses Limited | Real estate | 2026 |
| Johns Court (Tewkesbury) Management Company Limited | Households | 1990 |
| Johnston Consulting Limited | Professional & scientific | 2024 |
| Johnstone Safety International LLP | | 2004 |
| Joinedup Therapy Ltd | Health & social care | 2024 |
| Joinery Craft Limited | Manufacturing | 2002 |
| Joint Practice Limited | Health & social care | 2019 |
| Joist Limited | Information & communication | 2021 |
| Joko’S Beauty and Afro Hair Salon Ltd | Other services | 2024 |
| Jola Properties Ltd | Real estate | 2016 |
| Jolem Ltd | Hospitality | 2026 |
| Jolly Business Strategies Ltd | Professional & scientific | 2025 |
| Jolly Good Graphic Design Ltd | Professional & scientific | 2018 |
| Jolly People Ltd | Professional & scientific | 2025 |
| Jollygentlemensclub Ltd | Health & social care | 2025 |
| Jomico LLP | | 2011 |
| JON Lowe Heritage Ltd | Professional & scientific | 2018 |
| JON Selby User-Led Engineering Ltd | Professional & scientific | 2025 |
| JON Sleeper Coaching Services Limited | Professional & scientific | 2013 |
| Jona Investments Ltd | Real estate | 2019 |
| Jonadam Enterprises Ltd. | Professional & scientific | 1973 |
| Jonathan Edden Limited | Professional & scientific | 2008 |
| Jonathan Edward Magee Limited | Extraterritorial | 2024 |
| Jonathan Kenwright Consulting Limited | Professional & scientific | 2012 |
| Jonathan Moore Consultancy Limited | Information & communication | 2020 |
| Jonathon Porter Ltd | Information & communication | 2025 |
| Jones Smith Homes Ltd | Construction | 2022 |
| Jophiel Ltd | Education | 2014 |
| JOR Games Limited | Manufacturing | 2016 |
| Jordan Hennessy Limited | Real estate | 2012 |
| Jordan Marketing Ltd | Administrative & support | 2011 |
| Joseph Interior Design Limited | Professional & scientific | 2009 |
| Josephine Rossi Interior Works Ltd | Extraterritorial | 2011 |
| Josh Evans Building Services Limited | Construction | 2007 |
| Joshemz Properties Ltd | Real estate | 2017 |
| Joshua Business Coaching Limited | Professional & scientific | 2008 |
| Joshua Consulting Ltd | Real estate | 2024 |
| Joshua Harding Consultancy Ltd | Professional & scientific | 2025 |
| Joshua Morse Marketing Limited | Professional & scientific | 2013 |
| Jotto Publishing Limited | Professional & scientific | 1998 |
| Journey International Relations Ltd | Professional & scientific | 2025 |
| Journeyman Images Limited | Administrative & support | 2016 |
| Journojet Ltd | Professional & scientific | 2025 |
| Joushoppy PVT Limited | Wholesale & retail | 2023 |
| Jovik Green Consulting Limited | Professional & scientific | 2017 |
| Joy Graphics Ltd | Professional & scientific | 2021 |
| JP Books Ltd | Wholesale & retail | 2024 |
| JP Plumbing Co (Cheltenham) Ltd | Construction | 2024 |
| JPH Building Limited | Construction | 2019 |
| JPH Cars Ltd | Other services | 2013 |
| JPH Investments Limited | Construction | 2017 |
| JPM Consultants Limited | Construction | 2004 |
| JPM Growth Partners Ltd | Information & communication | 2024 |
| JPT Events & Retreats Ltd | Arts & recreation | 2023 |
| JPT Fitness Ltd | Health & social care | 2021 |
| JPW Competitions Limited | Other services | 2024 |
| JR Baker Groundworks Ltd | Construction | 2021 |
| JRC Construction Stroud Limited | Construction | 2025 |
| JRC Financial Ltd | Professional & scientific | 2024 |