| Jakes Flakes Ltd | Hospitality | 2026 |
| Jall Enterprises Ltd | Other services | 2020 |
| Jallikunda Healthcare Ltd | Health & social care | 2014 |
| Jallikunda Homes Ltd | Real estate | 2024 |
| JAM NOW Limited | Financial services | 2025 |
| JAM With Boys Productions Ltd | Information & communication | 2025 |
| Jamaspasa Surgical Ltd | Health & social care | 2026 |
| Jambel Holdings Ltd | Financial services | 2018 |
| Jambel Property Ltd | Construction | 2014 |
| Jambella Limited | Professional & scientific | 2016 |
| Jambo Dwellings Ltd | Hospitality | 2021 |
| Jamd Online Trading Limited | Wholesale & retail | 2026 |
| Jamd Tour and Travels Limited | Administrative & support | 2025 |
| James Alexander Mews Residents Limited | Households | 1999 |
| James Banham Ltd | Professional & scientific | 2016 |
| James Brett Limited | Wholesale & retail | 2002 |
| James Building Services Ltd. | Construction | 2003 |
| James Cargill (Norton Farms) Limited | Agriculture & fishing | 1951 |
| James Christopher Holdings Limited | Financial services | 2023 |
| James Clarke Estate Agents Ltd | Real estate | 2019 |
| James Colk Ltd | Professional & scientific | 2018 |
| James Distribution Ltd | Transport & logistics | 2016 |
| James Elles Ltd | Construction | 2014 |
| James Firebrace Associates Limited | Professional & scientific | 2011 |
| James Greenwood Ltd | Information & communication | 2018 |
| James H.Neill & Sons (Thurgarton) Limited | Agriculture & fishing | 1959 |
| James Harrison Consultancy Ltd | Administrative & support | 2006 |
| James Hendry Ltd | Construction | 2017 |
| James Hewitt Ltd | Construction | 2012 |
| James Howlett Ltd | Professional & scientific | 2021 |
| James KAY Associates Ltd | Administrative & support | 2019 |
| James Laughton Ltd | Other services | 2026 |
| James LEE W Ltd | Health & social care | 2012 |
| James Mallory Homes Limited | Construction | 2014 |
| James Murphy Electrical Services Ltd | Construction | 2023 |
| James Paul Webb Ltd | Construction | 2016 |
| James Phillips Film Ltd | Professional & scientific | 2023 |
| James Property Solutions Limited | Financial services | 2018 |
| James Rodger and SON Ltd | Agriculture & fishing | 2005 |
| James Rouse Photography Limited | Professional & scientific | 2014 |
| James Secker Limited | Construction | 2012 |
| James Steven Landscapes and Lawns Ltd | Administrative & support | 2026 |
| James Tubby Electrical Ltd | Manufacturing | 2019 |
| Jamesarthur Health Care Limited | Transport & logistics | 2019 |
| Jameshenrik Consulting Ltd | Information & communication | 2013 |
| Jamie Carter Films Ltd | Professional & scientific | 2021 |
| Jamie Gooch Limited | Administrative & support | 2009 |
| Jamie Hepher Design Ltd | Professional & scientific | 2025 |
| Jamie Hoskins Limited | Administrative & support | 2014 |
| Jamie Mccoan Productions Limited | Information & communication | 2003 |
| Jamie Moore Limited | Real estate | 2017 |
| Jamie Ransom Ltd | Other services | 2014 |
| Jamie Rush Limited | Administrative & support | 2008 |
| Jamie's Property Care Limited | Households | 2018 |
| Jamiesons Cosy Cottages Ltd | Hospitality | 2022 |
| Jamjar Studio Ltd | Information & communication | 2025 |
| JAMS67 Limited | Wholesale & retail | 2014 |
| Jandrian Ltd | Information & communication | 2023 |
| Jane Carver LD Services Limited | Health & social care | 2017 |
| Jane Farrell Consultancy Ltd | Professional & scientific | 2024 |
| Jane Hancy Electrolysis Specialist Ltd | Other services | 2021 |
| Jane Stockings Notary Public Limited | Professional & scientific | 2025 |
| Janusz Investment Company Limited | Financial services | 2019 |
| Japan in Norwich C.I.C. | Arts & recreation | 2026 |
| Jaqs Commercial Ltd | Professional & scientific | 2015 |
| Jaret Hair Studio Ltd | Other services | 2018 |
| Jarett Limited | Wholesale & retail | 2018 |
| Jarm 4 Ltd | Transport & logistics | 2024 |
| Jarrett & Abbs Ltd | Extraterritorial | 2019 |
| Jarrett Consultancy Services Ltd | Administrative & support | 2019 |
| Jarrett Plumbing & Heating (Anglia) Ltd | Extraterritorial | 2019 |
| Jarrett Plumbing & Heating Limited | Construction | 1987 |
| Jarretts Removals Limited | Transport & logistics | 1999 |
| Jarretts Transport Limited | Transport & logistics | 1991 |
| Jarrold & Sons Holdings Limited | Financial services | 2026 |
| Jarrold (ST. James) 3 SJC Limited | Real estate | 2005 |
| Jarrold (ST. James) D1/D2 Limited | Real estate | 2006 |
| Jarrold (ST. James) Limited | Real estate | 2006 |
| Jarrold Group Holdings Limited | Financial services | 2024 |
| Jarrold Training Limited | Education | 2023 |
| Jarrolds (Logistics) Limited | Transport & logistics | 2003 |
| Jarrolds (Property Holding Company) Limited | Financial services | 2023 |
| Jarrolds Investments Limited | Financial services | 2024 |
| Jarvis and Mcdade Ltd | Real estate | 2026 |
| Jary & Greensides Limited | Construction | 2012 |
| Jasem Property Co Ltd | Real estate | 2026 |
| Jasic Limited | Hospitality | 2016 |
| Jasmine Linen & Laundry Ltd | Administrative & support | 2024 |
| Jason Cowley Ltd | Arts & recreation | 2024 |
| Jason Fligg Sport & Exercise Performance Ltd | Professional & scientific | 2018 |
| Jason Graver Commercials Ltd | Real estate | 2012 |
| Jason Graver Properties Limited | Real estate | 2005 |
| Jason Houghton Osteopath Ltd | Health & social care | 2016 |
| Jasonmawephotography Ltd | Professional & scientific | 2024 |
| Jassia Enterprises Ltd | Wholesale & retail | 2024 |
| Jaswesty Limited | Financial services | 2026 |
| Jaunty Rose Developments Ltd | Construction | 2025 |
| Java Lounge (Birmingham) Ltd | Hospitality | 2014 |
| Javabean Limited | Manufacturing | 2016 |
| Javajava Limited | Hospitality | 2012 |