| J H Hutchinson & Sons Limited | Transport & logistics | 2002 |
| J H Pro Paint Limited | Wholesale & retail | 2008 |
| J H Skepper & SON Limited | Agriculture & fishing | 2008 |
| J H Tree Care Ltd | Agriculture & fishing | 2025 |
| J Hall Homes Limited | Construction | 2022 |
| J J L Developments Limited | Construction | 2014 |
| J K & Y Ltd | Real estate | 2021 |
| J K Fencing & Landscapes Ltd | Construction | 2013 |
| J K W Property Maintenance Limited | Extraterritorial | 2023 |
| J Kenhard Ltd | Wholesale & retail | 2024 |
| J Kher Investments Ltd | Real estate | 2024 |
| J Lazenby (Construction) Limited | Construction | 2009 |
| J Loughlin & Sons Limited | Construction | 2003 |
| J Louise P Ltd | Administrative & support | 2025 |
| J M Hill Consulting Ltd | Professional & scientific | 2025 |
| J M R Plastering Interiors Ltd | Construction | 2023 |
| J M Scotts Limited | Wholesale & retail | 2021 |
| J M Thackaberry Haulage Ltd | Transport & logistics | 2011 |
| J Mahoney Architects Ltd | Professional & scientific | 2019 |
| J Morley Limited | Construction | 2002 |
| J N Engineering Consultants Ltd | Administrative & support | 2016 |
| J P Cuthbert Consulting Ltd | Professional & scientific | 2004 |
| J P Finn Consultancy Ltd | Real estate | 2026 |
| J P Watson & Sons Ltd | Construction | 2014 |
| J P Woodhouse Limited | Wholesale & retail | 2014 |
| J Porter Limited | Professional & scientific | 2006 |
| J Poulton Electrical Ltd | Manufacturing | 2019 |
| J R Goude Building Services Ltd | Construction | 2023 |
| J R Holdings & Investments Limited | Real estate | 2021 |
| J R Sutton Property Limited | Real estate | 2015 |
| J Rowell Therapy Services Limited | Health & social care | 2023 |
| J S Building Svcs Limited | Construction | 2026 |
| J S E Electrical Limited | Construction | 2017 |
| J S Flooring (Sheffield) Limited | Construction | 2001 |
| J S Joinery & Home Improvements Ltd | Construction | 2025 |
| J S Joinery & Maintenance Ltd | Construction | 2024 |
| J S Savage Limited | Agriculture & fishing | 2001 |
| J Seale Properties Ltd | Real estate | 2026 |
| J Singh Properties Limited | Real estate | 2016 |
| J Squared Quantity Surveying Limited | Professional & scientific | 2020 |
| J Stewart Construction Limited | Construction | 2014 |
| J Strong Properties Ltd | Real estate | 2021 |
| J Sykes Limited | Professional & scientific | 2025 |
| J T & M Mirfin Limited | Administrative & support | 2010 |
| J T P M Limited | Information & communication | 2010 |
| J Timms Properties Limited | Real estate | 2015 |
| J Vazson Limited | Professional & scientific | 2002 |
| J W Bars Ltd | Hospitality | 2019 |
| J W Tyres Ltd | Wholesale & retail | 2018 |
| J W Whittaker Limited | Construction | 2017 |
| J W Wines Ltd | Wholesale & retail | 2003 |
| J Wilkinson Audit Services Limited | Administrative & support | 2021 |
| J Williams Plumbing Ltd | Construction | 2020 |
| J Woodhead Brickwork Limited | Construction | 2023 |
| J Woodward Building Services Ltd | Construction | 2013 |
| J Worrall Roofing and Cladding Ltd | Construction | 2022 |
| J Y H Holdings Ltd | Real estate | 2017 |
| J Young Property Ltd | Real estate | 2026 |
| J&A Photography Studio Ltd | Manufacturing | 2021 |
| J&B Living Ltd | Real estate | 2026 |
| J&D Bars Ltd | Hospitality | 2026 |
| J&E Kemp Limited | Real estate | 2020 |
| J&G Property Solutions Limited | Construction | 2021 |
| J&G Searcy Ltd | Hospitality | 2025 |
| J&H Brothers Limited | Real estate | 2025 |
| J&J ALL FRY Ltd | Hospitality | 2019 |
| J&J Bar Consultancy Limited | Professional & scientific | 2025 |
| J&J Chippy Ltd | Hospitality | 2023 |
| J&J Crewing Services Ltd | Professional & scientific | 2026 |
| J&J Electrical Solutions Limited | Construction | 2023 |
| J&J Global Logistics Limited | Transport & logistics | 2017 |
| J&Jo Ltd | Wholesale & retail | 2020 |
| J&K Food Trading Ltd | Real estate | 2018 |
| J&K Stainless Solutions Ltd | Manufacturing | 2013 |
| J&L Property Developments Ltd | Real estate | 2023 |
| J&M HOUSE4YOU Ltd | Real estate | 2023 |
| J&M Productions Ltd | Information & communication | 2024 |
| J&P Pubs Ltd | Hospitality | 2026 |
| J&R's Property Ltd | Real estate | 2023 |
| J&Z Designs Limited | Manufacturing | 2025 |
| J-Cube Property Investments Limited | Real estate | 2025 |
| J-Line Hospitality Limited | Hospitality | 2022 |
| J-Spacer Limited | Professional & scientific | 2025 |
| J-Sport Engineering Ltd | Professional & scientific | 2014 |
| J. & C.R. Milnes Limited | Agriculture & fishing | 1999 |
| J. C. Site Engineering Ltd | Construction | 2007 |
| J. D. Jones (Plastering Contractors) Limited | Construction | 1963 |
| J. GUY Rusling Limited | Real estate | 2002 |
| J. L. T. Kitchens Ltd | Construction | 2008 |
| J. Proud Transport Limited | Transport & logistics | 2012 |
| J. R. Sushi Ltd | Hospitality | 2026 |
| J. T. Pickfords Limited | Wholesale & retail | 2007 |
| J. W. Automotive (Loxley) Ltd | Wholesale & retail | 2025 |
| J.A. Maxfield & SON Limited | Transport & logistics | 1982 |
| J.A. Wilkinson Limited | Administrative & support | 1987 |
| J.A.G Waste Solutions Ltd | Water & waste | 2026 |
| J.A.S OIL Limited | Wholesale & retail | 2006 |
| J.B. Ingall EOT Limited | Financial services | 2024 |
| J.B. Ingall Limited | Manufacturing | 1974 |
| J.B.P. Equipe Limited | Arts & recreation | 1987 |