| J & J Fastfood Limited | Wholesale & retail | 2014 |
| J & K Property Developments Limited | Construction | 2011 |
| J & N Frying Services Ltd | Hospitality | 2015 |
| J & P Decorators Limited | Construction | 2018 |
| J & S Jewellery Ltd | Wholesale & retail | 2014 |
| J & S Land and Development Limited | Construction | 2025 |
| J & S Reid LLP | | 2011 |
| J & V Property (East) Ltd | Real estate | 2024 |
| J a Collins Limited | Construction | 1966 |
| J a Future Property Services Limited | Real estate | 2025 |
| J a Herbert Design and Build Ltd | Construction | 2013 |
| J a Insulations Ltd | Construction | 2018 |
| J a Plant Hire & Groundworks Limited | Construction | 2015 |
| J Alston & Sons Limited | Agriculture & fishing | 1948 |
| J and C Abbott Trading Limited | Arts & recreation | 2016 |
| J B Auto Solutions Limited | Wholesale & retail | 2016 |
| J B W Properties UK Ltd | Real estate | 2007 |
| J Baldwin Ltd | Professional & scientific | 2026 |
| J Bliss Electrical Ltd | Construction | 2026 |
| J Brady Garage Doors Limited | Construction | 2024 |
| J Bunn Homes (Banham) Limited | Construction | 2021 |
| J C Auto Parts Ltd | Wholesale & retail | 2025 |
| J C Electrical (Norwich) Ltd | Construction | 2026 |
| J C Insite Limited | Professional & scientific | 2015 |
| J C S Management Ltd | Extraterritorial | 2007 |
| J C Surveyors Ltd | Professional & scientific | 2020 |
| J C W Cyber Research & Training Limited | Administrative & support | 2017 |
| J Cole Rural Limited | Professional & scientific | 2022 |
| J Collins Creative Ltd | Professional & scientific | 2021 |
| J D Construction (Norwich) Limited | Construction | 2017 |
| J D Cooling Service and Maintenance Limited | Construction | 2021 |
| J D Cooling Systems Limited | Construction | 1994 |
| J D Irwin Family Investments Ltd | Financial services | 2025 |
| J D Parties Ltd. | Real estate | 1995 |
| J D Services (Norfolk) Ltd | Administrative & support | 2015 |
| J Dunn & Co Ltd | Professional & scientific | 2026 |
| J E R Construction & Groundworks Limited | Construction | 2016 |
| J F Haulage Ltd | Transport & logistics | 2009 |
| J Facades Limited | Professional & scientific | 2022 |
| J Fresh Ltd | Administrative & support | 2023 |
| J Helm Properties Ltd | Construction | 2015 |
| J Higham Building Services Ltd | Construction | 2014 |
| J Hill Plastering Ltd | Construction | 2015 |
| J Howells Ltd | Health & social care | 2025 |
| J Howzing Ltd | Real estate | 2021 |
| J J Services Ltd | Energy | 2016 |
| J Jefferies Ltd | Other services | 2021 |
| J Kubiesa Limited | Information & communication | 2012 |
| J L Aesthetics Training Limited | Education | 2026 |
| J L Services Anglia Ltd | Administrative & support | 2017 |
| J Lambert Haulage Ltd | Transport & logistics | 2016 |
| J M Balchin Ltd | Financial services | 2018 |
| J M Builders (Norfolk) Ltd | Construction | 2022 |
| J M Read Consultancy Limited | Professional & scientific | 2008 |
| J M Wilson Ltd | Real estate | 2006 |
| J Martin Building Ltd | Construction | 2014 |
| J Medler Wood Services Ltd | Transport & logistics | 2026 |
| J Middleton Construction Ltd | Construction | 2022 |
| J Milne Electrical Services Limited | Construction | 2017 |
| J Murrell Ltd | Wholesale & retail | 2019 |
| J Newton Groundworks Limited | Construction | 2013 |
| J Norman Properties Limited | Real estate | 2018 |
| J P Home Care Ltd | Health & social care | 2025 |
| J P L Property Developments Limited | Construction | 2025 |
| J Page Electrical Services Ltd | Other services | 2014 |
| J Peacock Plumbing and Heating Ltd | Construction | 2019 |
| J R Booen Properties Limited | Real estate | 2022 |
| J R Construction (Anglia) Limited | Construction | 2011 |
| J R Detailing Prestigious Car Care Limited | Administrative & support | 2024 |
| J R H Limited Ltd | Real estate | 2024 |
| J R Howes Limited | Other services | 2017 |
| J R Mathlin Power Systems Limited | Construction | 2011 |
| J Rowson Consulting Ltd | Professional & scientific | 2013 |
| J S Building Services (East Anglia) Ltd | Construction | 2006 |
| J S Engineering Services Limited | Manufacturing | 2009 |
| J S International Media Ltd | Professional & scientific | 2018 |
| J S Services (Norwich) Limited | Manufacturing | 2003 |
| J S Wills Limited | Professional & scientific | 2002 |
| J Saunders Scaffolding Limited | Construction | 2010 |
| J Stanford Financial Services Limited | Financial services | 2022 |
| J T Millard Ltd | Real estate | 2018 |
| J T Storage Limited | Transport & logistics | 2016 |
| J Thornton Paving & Landscaping Ltd | Construction | 2019 |
| J V Construction Limited | Construction | 2010 |
| J V Group (Norfolk) Ltd | Financial services | 2023 |
| J W Horticulture & Fencing Ltd | Administrative & support | 2024 |
| J W Riley Contracting Limited | Agriculture & fishing | 2017 |
| J W Sound Ltd | Information & communication | 2012 |
| J&B- the House of Afro- Foods Ltd | Wholesale & retail | 2025 |
| J&C Pharma Ltd | Health & social care | 2024 |
| J&J Catering Limited | Hospitality | 2026 |
| J&J Robson FIC1 Limited | Financial services | 2023 |
| J&J Trading Group Limited | Wholesale & retail | 2025 |
| J&K Trading UK Limited | Wholesale & retail | 2014 |
| J&L Financial Solutions Limited | Financial services | 2022 |
| J&N Inspection Ltd. | Professional & scientific | 2016 |
| J&P Cromer Ltd | Hospitality | 2006 |
| J&S Distributions Limited | Wholesale & retail | 2025 |
| J&Sp Holdings Limited | Construction | 2017 |
| J-Cat Independent Jaguar Specialist Ltd | Wholesale & retail | 2025 |