| Jesse Duplantis Ministries | Other services | 1996 |
| Jessop Medical Limited | Professional & scientific | 2026 |
| Jewell Advantage Ltd | Professional & scientific | 2019 |
| Jewells Creative Social Work Limited | Health & social care | 2015 |
| JF Consulting Services Ltd | Professional & scientific | 2024 |
| JFW Media Limited | Information & communication | 1999 |
| Jinks Limited | Hospitality | 1996 |
| JJ Worldwide Ltd | Wholesale & retail | 2021 |
| Jjpw Properties Limited | Construction | 2025 |
| JJR Brickwork Ltd | Construction | 2018 |
| JJS Construction Southwest Ltd | Construction | 2023 |
| JK Construction Services Ltd | Construction | 2016 |
| JK Health Ltd | Health & social care | 2014 |
| JKJ Properties Ltd | Real estate | 2019 |
| Jlmartin Ltd | Construction | 2025 |
| Jlmc Properties Ltd | Real estate | 2013 |
| JM & SJ Investments Ltd | Education | 2010 |
| JM Legal Consulting Limited | Professional & scientific | 2022 |
| JM Sunshine Ltd | Wholesale & retail | 2025 |
| JMB Educational Services Ltd | Education | 2021 |
| JME Conservation Ltd. | Professional & scientific | 2010 |
| Jmwstudio Ltd | Information & communication | 2021 |
| JNS Capital Ltd | Real estate | 2021 |
| JO Bridger Nutrition Ltd | Health & social care | 2010 |
| JO Emerson Limited | Professional & scientific | 2014 |
| Jody Cory Goldsmiths Limited | Wholesale & retail | 2009 |
| JOE Hitchins Groundworks & Building Services Limited | Construction | 2016 |
| JOE Russell Excell Limited | Wholesale & retail | 2026 |
| Joel Bugg Furniture & Spaces Ltd | Manufacturing | 2019 |
| Joel Jones Lettings Ltd | Real estate | 2026 |
| Joels Jobs Ltd | Construction | 2025 |
| Joetoria Ltd | Real estate | 2017 |
| Joey Rossi Ltd | Arts & recreation | 2018 |
| Johanna Everritt Training Ltd | Professional & scientific | 2026 |
| Johanna House Management Company Limited | Households | 2022 |
| Johanna Nilsson Design Limited | Professional & scientific | 2020 |
| John Cooper Building Services (Bath) Limited | Construction | 2006 |
| John D. Hill Electrical Limited | Construction | 1994 |
| John Dean Building Contractors Limited | Construction | 1991 |
| John Hancock & Sons (Bath) Limited | Mining & quarrying | 1982 |
| John Hartley Investments Ltd | Construction | 2022 |
| John House Surgery Ltd | Health & social care | 2013 |
| John Knill & SON Limited | Transport & logistics | 2003 |
| John Meredith Geophysical Services Limited | Professional & scientific | 2009 |
| John Moore(Sports)Limited | Wholesale & retail | 1935 |
| John Westwick Consulting Limited | Professional & scientific | 2013 |
| Johnson & Hussey Limited | Professional & scientific | 2019 |
| Johnson and Thomson Consulting Limited | Professional & scientific | 2026 |
| Johnson and Thomson Ltd | Real estate | 2023 |
| Joiner of Dots Ltd | Professional & scientific | 2019 |
| Joint Properties Ltd | Real estate | 2023 |
| Joiosa Ltd | Wholesale & retail | 2023 |
| Jola Integrative Therapy Ltd | Health & social care | 2025 |
| Jolliffe Inns Limited | Hospitality | 2017 |
| Jonah Lighting Ltd | Arts & recreation | 2022 |
| Jonathan Heskia Consulting Limited | Professional & scientific | 2021 |
| Jonathan Logsdon Architect Limited | Professional & scientific | 2021 |
| Jonathon Schofield Post Graduate Training Limited | Health & social care | 2009 |
| Jordan & Whyte LLP | | 2016 |
| Jordi Investments Ltd | Financial services | 2024 |
| Jose Luis Gomez Podiatry Services Limited | Health & social care | 2026 |
| Joseph Bennett Limited | Information & communication | 2012 |
| Joshua Beaumont Limited | Arts & recreation | 2023 |
| Joshua Bennett Watkins Ltd | Other services | 2011 |
| Journal Editions Limited | Information & communication | 2015 |
| Joya Restaurant Ltd | Hospitality | 2009 |
| Joyri Ltd | Real estate | 2021 |
| Joystick Asset Management Ltd | Administrative & support | 2020 |
| Joyus Creative Ltd | Professional & scientific | 2024 |
| JP & Co Estates Ltd. | Professional & scientific | 2024 |
| JP Connections Limited | Administrative & support | 2013 |
| JP Itsm Limited | Information & communication | 2016 |
| JP Properties Melksham Ltd | Real estate | 2025 |
| JPM Classics Limited | Wholesale & retail | 2013 |
| JPS Holdings (South West) Limited | Financial services | 2021 |
| JR Leakey Media Ltd | Information & communication | 2012 |
| JRC Public Sector Consulting Ltd | Professional & scientific | 2017 |
| JRH Enable Ltd | Public administration | 2019 |
| JRS Accountants Limited | Financial services | 2005 |
| JRW Trading Ltd | Public administration | 2023 |
| JRX Innovations Ltd | Information & communication | 2026 |
| JS Building & Construction Services Ltd | Construction | 2024 |
| JS Construction and Renovation Ltd | Construction | 2024 |
| JS Engineering Consultants Limited | Construction | 2018 |
| JS Lewis Limited | Professional & scientific | 2009 |
| JSA Bath Ltd | Hospitality | 2025 |
| JSH Accountancy Limited | Professional & scientific | 2005 |
| JSL Dental Laboratories Limited | Manufacturing | 2002 |
| JSM (Bridgwater) Ltd | Financial services | 2011 |
| JSS (South Manchester) Limited | Real estate | 1999 |
| JSW Restorations Ltd | Construction | 2025 |
| JT Electrics Limited | Construction | 2007 |
| Jubara Ltd | Professional & scientific | 2022 |
| Juddrx Ltd | Other services | 2014 |
| Judith Goss Florists Limited | Wholesale & retail | 2003 |
| Juggling Care Limited | Extraterritorial | 2021 |
| Julia Hayball Media Limited | Other services | 2006 |
| Julia's Homes Limited | Households | 2014 |
| Julian House Trading Limited | Wholesale & retail | 1997 |
| Juliet Crisp Consulting LLP | | 2025 |