| Jadamedo Trading Limited | Wholesale & retail | 2023 |
| Jade Garden Chinese Takeaway Ltd | Hospitality | 2019 |
| JAH Keighley Trading Ltd | Administrative & support | 2017 |
| Jakiky House Limited | Real estate | 2025 |
| Jamaat Medical Ultrasound Limited | Professional & scientific | 2022 |
| James C Brett (Yarn Merchants) Ltd | Wholesale & retail | 2013 |
| James C Brett Holdings Limited | Wholesale & retail | 2026 |
| James Fawcett Freelance Ltd | Information & communication | 2021 |
| James Hiscoe Data Ltd | Information & communication | 2018 |
| James Wheeler (Artist) Limited | Arts & recreation | 2005 |
| Jamil Hussain Limited | Financial services | 2018 |
| Jamila Laboratoires Limited | Wholesale & retail | 2020 |
| Jams Property Group Ltd | Real estate | 2023 |
| Jana Jackson Ltd | Wholesale & retail | 2010 |
| JAP Motors 96 Ltd | Wholesale & retail | 2025 |
| Jason Walton Electrical Ltd | Construction | 2023 |
| Jawaid a Khan Ltd | Health & social care | 2019 |
| Jaxon Contracts & Holdings Limited | Construction | 2021 |
| JAY Finance Ltd | Professional & scientific | 2018 |
| JAY Gokhale (Surgery) Ltd | Health & social care | 2014 |
| Jayar Process & Mechanical Ltd | Manufacturing | 2025 |
| Jayrange Limited | Transport & logistics | 1991 |
| Jays Hair Studio Ltd | Other services | 2024 |
| Jaytail Properties Ltd | Real estate | 2024 |
| Jaza Food Ltd | Wholesale & retail | 2021 |
| JB Consulting (Yorkshire) Limited | Professional & scientific | 2023 |
| JC Draper Limited | Other services | 2017 |
| JC Holidays & Property Maintenance Limited | Construction | 2026 |
| JC Rendering Ltd | Construction | 2018 |
| JCH Accounting Services Limited | Administrative & support | 2017 |
| JD Developments (Yorkshire) Ltd | Construction | 2019 |
| JDK Landscape and Groundcare Limited | Wholesale & retail | 2026 |
| JE Home & Garden Services Ltd | Construction | 2020 |
| Jeetas Carpets & Flooring Ltd | Construction | 2019 |
| Jeff Autos Ltd | Wholesale & retail | 2020 |
| Jeff Carter Decorators Ltd | Construction | 2015 |
| JEM Pubco Ltd | Hospitality | 2025 |
| Jenkins Carpets Limited | Wholesale & retail | 2017 |
| Jenna Cusworth Bolger Ltd | Information & communication | 2018 |
| Jennamy Limited | Information & communication | 2000 |
| Jennamy Property Services Limited | Real estate | 2002 |
| Jennings Services Limited | Construction | 2023 |
| Jersey House (Keighley) Limited | Construction | 2000 |
| Jewels by Raaha Limited | Wholesale & retail | 2025 |
| JEY Estates Limited | Real estate | 2023 |
| JGL Forklifts Ltd | Manufacturing | 2017 |
| Jhak Ltd | Administrative & support | 2022 |
| JHC Property Developments Ltd | Real estate | 2025 |
| Jigsaw Estate Agents Limited | Real estate | 2011 |
| Jima Associates Ltd | Real estate | 2021 |
| JJR Enetrprises Limited | Real estate | 2009 |
| Jkay Investment Ltd | Real estate | 2024 |
| Jkdental Ltd | Health & social care | 2023 |
| JKK Project Management Ltd | Professional & scientific | 2021 |
| Jks-Solutions (UK) Ltd | Education | 2012 |
| JL Smith Electrical Limited | Construction | 2023 |
| JLC Assessment Services Ltd | Education | 2025 |
| JLD International Ltd | Transport & logistics | 2026 |
| JLT Construction Consultancy Ltd | Professional & scientific | 2025 |
| JLW Brand and Marketing Consultancy Ltd | Professional & scientific | 2026 |
| JM Audio Limited | Professional & scientific | 2015 |
| JMB Investments (Yorkshire) Limited | Real estate | 2001 |
| JMD Solutions LLP | | 2010 |
| JMH Aspirations Ltd | Other services | 2011 |
| JN Builders (Yorkshire) Limited | Construction | 2012 |
| JO Farn Consulting Ltd | Professional & scientific | 2026 |
| Joda Freight Limited | Transport & logistics | 1997 |
| Joda Holdings Limited | Transport & logistics | 2005 |
| Joda Properties Limited | Financial services | 2022 |
| Joda Transport Limited | Financial services | 2022 |
| Joden Property Limited | Real estate | 2014 |
| Joey P Property Ltd | Real estate | 2026 |
| John Anderson Fish Merchants Ltd | Wholesale & retail | 2012 |
| John C. Pickard (Plumbing & Heating) Limited | Construction | 1977 |
| John Clayton Electrical Services Ltd | Construction | 2016 |
| John Dunne Climbing Limited | Professional & scientific | 2025 |
| John Dunne Limited | Professional & scientific | 2003 |
| John Durkin Ceramics Limited | Construction | 2008 |
| John Green Health & Safety Ltd | Professional & scientific | 2023 |
| John Green Training &Consultancy Limited | Administrative & support | 2014 |
| John Haggas Limited | Extraterritorial | 2004 |
| John O Taylor (Welding & Fabrication) Limited | Manufacturing | 2010 |
| John Ridley Insulation Limited | Construction | 2011 |
| John S. Feather Limited | Manufacturing | 1978 |
| John W.Laycock.Limited | Wholesale & retail | 1916 |
| John William Eric Shaw Ltd | Extraterritorial | 2022 |
| Joker Jewellers Ltd | Wholesale & retail | 2026 |
| Jordan Mental Health App Limited | Information & communication | 2026 |
| Jovinda and Sons Limited | Transport & logistics | 2025 |
| Joyce Technology Consulting Ltd | Information & communication | 2023 |
| JP2Y Ltd | Wholesale & retail | 2025 |
| JPC Bespoke Building Services Limited | Construction | 2018 |
| JPR Developments Ltd | Construction | 2019 |
| JPS Corp Ltd | Real estate | 2021 |
| JR West Properties Ltd | Real estate | 2018 |
| Jr&Lk Supplies Ltd | Wholesale & retail | 2025 |
| JR1 Optics Ltd | Health & social care | 2015 |
| JS Plastering & Rendering Limited | Construction | 2023 |
| JS Property Investment Limited | Real estate | 2017 |
| Js&A Ltd | Construction | 2025 |