| JJB Management Limited | Professional & scientific | 2014 |
| JJC and VLC Enterprises Ltd | Transport & logistics | 2016 |
| JJC Plastic Surgery Consultancy Ltd | Health & social care | 2016 |
| JJD Logistics Ltd | Transport & logistics | 2026 |
| JJF Software Ltd | Professional & scientific | 2023 |
| JJH Trading Limited | Hospitality | 2005 |
| JJJ Management Ltd | Real estate | 2025 |
| JJL Commerce Ltd | Wholesale & retail | 2025 |
| JJL Guitars Limited | Manufacturing | 2019 |
| JJM Geotechnics Ltd | Professional & scientific | 2019 |
| JJN Advisory Ltd | Information & communication | 2024 |
| JJS Foods Limited | Hospitality | 2018 |
| Jjsfba Limited | Wholesale & retail | 2025 |
| JK Groundworks & Landscaping Ltd | Administrative & support | 2021 |
| JK Holdco Limited | Financial services | 2023 |
| JKBARBER1208 Consulting Limited | Financial services | 2026 |
| Jken Enterprises Limited | Transport & logistics | 2016 |
| JKH Developments Limited | Real estate | 2008 |
| Jklm Holdings Limited | Financial services | 2024 |
| JKS Automotive Solutions Limited | Wholesale & retail | 2011 |
| JL Cook Holdings Ltd | Construction | 2023 |
| JL Engineering (EA) Limited | Construction | 2023 |
| JL Events (Norwich) Limited | Wholesale & retail | 2018 |
| JL Heating Solutions Ltd | Construction | 2017 |
| JL Middleton Property Developments Ltd | Real estate | 2026 |
| JL Norfolk Limited | Real estate | 2018 |
| JL Protection Fire & Security Ltd | Administrative & support | 2026 |
| JL Protection Systems Ltd | Professional & scientific | 2019 |
| JL Resources Ltd | Wholesale & retail | 2023 |
| JL Speech Therapy Ltd | Health & social care | 2025 |
| JLB Plumbing and Heating Services Ltd | Construction | 2023 |
| JLB Search Ltd | Administrative & support | 2024 |
| JLC Healthcare Ltd | Health & social care | 2022 |
| Jlcarey Property Ltd | Real estate | 2025 |
| Jlewistrades Ltd | Energy | 2019 |
| JLF Car Nest Limited | Transport & logistics | 2021 |
| JLG C1 Bond Limited | Financial services | 2014 |
| JLG Newco 1 Limited | Financial services | 2022 |
| JLG Newco 2 Limited | Financial services | 2022 |
| JLH Autos Limited | Wholesale & retail | 2018 |
| JLL Contracts Ltd | Construction | 2019 |
| JLO Investments Ltd | Real estate | 2018 |
| JLR Exteriors Limited | Other services | 2022 |
| JM Assessing Limited | Education | 2018 |
| JM Enterprises (East Anglia) Limited | Professional & scientific | 2012 |
| JM Installations (Norwich) Ltd | Construction | 2020 |
| JM Pharma Services Limited | Health & social care | 2025 |
| JMB Contracts Limited | Administrative & support | 2017 |
| JMB Designs Ltd | Extraterritorial | 2023 |
| JMC Accounts Ltd | Professional & scientific | 2018 |
| JMC Eco Consultancy Ltd | Professional & scientific | 2023 |
| JMC Installations Ltd | Construction | 2018 |
| JMC Property Management Limited | Real estate | 2020 |
| JMD Investments Limited | Construction | 2006 |
| Jmdl Holdings Limited | Real estate | 2017 |
| JMF IT Services Limited | Information & communication | 2014 |
| JMI Builders Ltd | Construction | 2022 |
| JMJ Web Design Limited | Administrative & support | 2013 |
| JMN Adjusting Ltd | Professional & scientific | 2022 |
| JMO Building & Plastering Limited | Construction | 2014 |
| JMP Property Investments Ltd | Real estate | 2025 |
| JMR Fabrications Limited | Manufacturing | 2020 |
| JMR Property Holdings Ltd | Real estate | 2023 |
| JMS Group Ltd | Information & communication | 1983 |
| JMS Rendering Ltd | Construction | 2013 |
| JMW Holdings (EA) Ltd | Financial services | 2025 |
| JN Bush Electrical Services Limited | Construction | 2005 |
| JN Valentis Ltd | Administrative & support | 2025 |
| Jnaw Limited | Financial services | 2022 |
| JNB Engineering Consultants Ltd | Professional & scientific | 2017 |
| Jnewton Football Coaching Ltd | Education | 2025 |
| JNG BIM Ltd. | Professional & scientific | 2026 |
| JNL Renewables Ltd | Construction | 2024 |
| JNR Autolocks Ltd | Wholesale & retail | 2026 |
| JNR Building Ltd | Construction | 2014 |
| Jo&Di Ltd | Hospitality | 2025 |
| Jo's Party Supplies Limited | Wholesale & retail | 2019 |
| Joakim Boren Limited | Professional & scientific | 2009 |
| Joanne Lewsley Ltd | Information & communication | 2020 |
| Joanne Louise HB Limited | Other services | 2026 |
| JOB Fairs Limited | Information & communication | 2010 |
| Jobe Transport Ltd | Transport & logistics | 2003 |
| Jobello Ltd | Professional & scientific | 2023 |
| Jobo Ropes Ltd | Mining & quarrying | 2026 |
| Jobs by County Limited | Administrative & support | 2016 |
| Jocosa Ltd | Information & communication | 2012 |
| JOE & JEM Ltd | Hospitality | 2019 |
| JOE EYE Limited | Professional & scientific | 2015 |
| JOE Farrell (Haulage & Contracting) Ltd | Transport & logistics | 1998 |
| JOE Ringer Events Ltd | Arts & recreation | 2021 |
| JOE Spice Ltd | Wholesale & retail | 2017 |
| JOE Swainson Design Limited | Professional & scientific | 2019 |
| Joel Graham Limited | Information & communication | 2019 |
| Joga Ltd | Wholesale & retail | 2022 |
| Jogscap Services Ltd | Construction | 2023 |
| John & Sylvia Reid Limited | Administrative & support | 2008 |
| John Alun Limited | Wholesale & retail | 2025 |
| John Bingham Limited | Information & communication | 2018 |
| John Bradley & Sons Transport Limited | Professional & scientific | 1968 |
| John Briggs & SON Limited Liability Partnership | | 2024 |