| Instawood Limited | Wholesale & retail | 2019 |
| Integri-Fd Limited | Professional & scientific | 2010 |
| Interior Fitout (UK) Limited | Administrative & support | 2004 |
| Interior Site Support Ltd | Administrative & support | 2018 |
| Intortus Consulting Ltd | Information & communication | 2026 |
| Invivo Therapies Ltd | Other services | 2014 |
| Iootrans Ltd | Transport & logistics | 2016 |
| IR3 Management Ltd | Professional & scientific | 2016 |
| Isco 8118 Ltd | Hospitality | 2026 |
| Istanbul Barbers Selby Ltd | Other services | 2024 |
| IT Service Management Consultancy Ltd | Information & communication | 2023 |
| IT Takes Two Limited | Real estate | 2004 |
| ITE Holdings (Yorkshire) Limited | Real estate | 2022 |
| ITE Products International Ltd | Professional & scientific | 2020 |
| ITE Products Ltd | Wholesale & retail | 2016 |
| Itel Consultancy Ltd | Information & communication | 2009 |
| Iulian Cargo Trans Ltd | Transport & logistics | 2019 |
| Ivelina Mitkova Ltd | Education | 2026 |
| J & C Harlequin Silver Productions Limited | | 1978 |
| J & G TM Services Ltd | Professional & scientific | 2018 |
| J a Mounfield & SON Limited | Manufacturing | 2012 |
| J Barton Management Limited | Administrative & support | 2022 |
| J Barton Properties LLP | | 2022 |
| J H Dixon & SON LLP | | 2015 |
| J Laudage Ltd | Real estate | 2022 |
| J M Construction Services Limited | Construction | 2006 |
| J Preece Ltd | Administrative & support | 2025 |
| J Rusling Holdings Ltd | Financial services | 2025 |
| J Steele Engineering Ltd | Professional & scientific | 2024 |
| J T Anderson Transport Limited | Transport & logistics | 2002 |
| J W Wood & SON Limited | Extraterritorial | 2015 |
| J Wilson Agricultural Services Ltd | Manufacturing | 2022 |
| J&D Property Solutions Ltd | Real estate | 2021 |
| J.A Restaurant Limited | Hospitality | 2026 |
| J.A.B Welding Services Limited | Manufacturing | 2021 |
| Ja/Dh Limited | Real estate | 2023 |
| Jaava Construction Limited | Construction | 2014 |
| JAC Property Services Ltd | Real estate | 2026 |
| Jackson Andrew Developments Limited | Construction | 2024 |
| Jackson Vehicle Solutions Ltd | Wholesale & retail | 2018 |
| Jacz Property Limited | Real estate | 2022 |
| JAF Collective Ltd | Hospitality | 2026 |
| JAG Engineering Ltd | Professional & scientific | 2025 |
| Jammie Olive Kitchen Limited | Wholesale & retail | 2018 |
| Jared Lawrence Ltd | Wholesale & retail | 2023 |
| Jas-Med Ltd | Health & social care | 2017 |
| Jas/Amy Limited | Wholesale & retail | 2024 |
| JC LAB Ltd | Other services | 2025 |
| Jcarrproperty Ltd | Financial services | 2024 |
| JCP Haulage Limited | Transport & logistics | 2011 |
| Jean Paige Property Ltd | Real estate | 2022 |
| Jen&Ben Ltd | Transport & logistics | 2019 |
| Jennifer Paige Hair & Beauty Limited | Other services | 2023 |
| Jessica&Jessica Ltd | Hospitality | 2022 |
| Jestsetgotravel Ltd | Administrative & support | 2026 |
| JET Art Aviation Limited | Wholesale & retail | 2007 |
| JF Agri Supplies Limited | Wholesale & retail | 2024 |
| JGD Homes Ltd | Real estate | 2024 |
| JGD Leisure Ltd | Hospitality | 2026 |
| JHW Office Consultancy Ltd | Professional & scientific | 2025 |
| Jiggy Properties Ltd | Financial services | 2025 |
| Jiggy Properties Trustees Limited | Real estate | 2026 |
| Jigsaw Move Limited | Real estate | 2014 |
| Jj's Gymnastics Academy Limited | Arts & recreation | 2013 |
| JJH Consultancy Services Ltd | Professional & scientific | 2024 |
| JJR Joinery Ltd | Construction | 2018 |
| Jjss Ltd | Real estate | 2021 |
| JKL Planning Ltd | Professional & scientific | 2024 |
| JM Pegasus Ltd | Administrative & support | 2023 |
| JMA Driving Ltd | Transport & logistics | 2016 |
| Jmdhl Limited | Professional & scientific | 2020 |
| JMT Masonry Limited | Construction | 2017 |
| JN HGV Services Ltd | Wholesale & retail | 2019 |
| John Black Ltd | Manufacturing | 2019 |
| John Himsworth Wealth Management Limited | Financial services | 2013 |
| John Petch Transport Limited | Transport & logistics | 2010 |
| Johnson Furniture Ltd | Manufacturing | 2021 |
| Jolly Sailor (Cawood) Limited | Hospitality | 2019 |
| Jonathon Morgan Design Associates Limited | Administrative & support | 2009 |
| Jonny Blossom Ltd | Wholesale & retail | 2023 |
| Jordan Richardson Ltd | Construction | 2024 |
| Jorvik Bathrooms Ltd | Construction | 2022 |
| JOS Richardson & SON Limited | Financial services | 2021 |
| Jotih Ltd | Information & communication | 2022 |
| Jovial Antiques Ltd | Wholesale & retail | 2021 |
| JP & DP (Holdings) Ltd | Transport & logistics | 2016 |
| JP Harll Limited | Real estate | 2019 |
| Jpires Telecom Ltd | Professional & scientific | 2021 |
| JPT Group Limited | Manufacturing | 2017 |
| JR Contracts (Yorkshire) Limited | Construction | 2021 |
| JRM Developments Limited | Construction | 2014 |
| JRS Services (C-Stores) Limited | Extraterritorial | 2023 |
| JRS Services (Convenience) Limited | Wholesale & retail | 1988 |
| JRS Services (Forecourts) Limited | Wholesale & retail | 1980 |
| JRS Services (Goole) Limited | Wholesale & retail | 2019 |
| JRS Services (Leeds) Limited | Wholesale & retail | 1945 |
| JRS Subs Ltd | Hospitality | 2015 |
| JRZ Properties Limited | Real estate | 2021 |
| JS Beauty Ltd | Other services | 2019 |
| JSJ Garage Doors Limited | Construction | 2025 |