| Judas the Unholy Ltd | Wholesale & retail | 2026 |
| Jude Charlton Ltd | Construction | 2025 |
| Judeline Nicholas Associates Limited | Education | 2002 |
| Judges Properties Limited | Real estate | 2019 |
| Jugo-Links Services Ltd | Administrative & support | 2025 |
| Jugpall UK Limited | Information & communication | 2011 |
| Juice Management Limited | Professional & scientific | 2016 |
| Juist Ltd | Wholesale & retail | 2024 |
| Juke Entertainment Limited | Arts & recreation | 2016 |
| Jukna and Co Limited | Wholesale & retail | 2021 |
| Jules Cleaning Limited | Administrative & support | 2025 |
| Jules SW Ltd | Health & social care | 2017 |
| Julia Hairdresser Ltd | Other services | 2023 |
| Julian Hunter Joinery Limited | Manufacturing | 2014 |
| Julian Support Limited | Health & social care | 1997 |
| Julian Youngs Limited | Manufacturing | 2024 |
| Juliana Ltd | Other services | 2014 |
| Julie Adcock Executive Research Ltd | Administrative & support | 2012 |
| Julmore Ltd | Health & social care | 2022 |
| Jump GY Limited | Arts & recreation | 2025 |
| Junction 5 Plumbing & Heating Limited | Construction | 2009 |
| Juni Cosmetics Limited | Manufacturing | 2018 |
| Junior Farm Kennels Limited | Agriculture & fishing | 2023 |
| Junior Green London Ltd | Other services | 2018 |
| Juniper Homes (RHS) Ltd | Construction | 2019 |
| Juniper Property Investments Limited | Real estate | 2026 |
| Junk Jeans Limited | Wholesale & retail | 2024 |
| Juno Rose Limited | Real estate | 2016 |
| Juqi Limited | Hospitality | 2016 |
| Jurassic Apps Ltd | Information & communication | 2025 |
| Jurassic Couriers Limited | Transport & logistics | 2020 |
| Jusexperiences UK Limited | Administrative & support | 2019 |
| Just Food Norfolk Limited | Hospitality | 2009 |
| Just Accountancy Norfolk Ltd | Professional & scientific | 2019 |
| Just ADD Cake Ltd | Wholesale & retail | 2019 |
| Just BEX Ltd | Construction | 2013 |
| Just Brakes Ltd | Wholesale & retail | 2021 |
| Just Buy Properties Ltd | Real estate | 2017 |
| Just Double Glazing Limited | Construction | 2015 |
| Just Electrical (Norfolk) Ltd | Construction | 2011 |
| Just Fans Ltd | Wholesale & retail | 2007 |
| Just Financial Planning Ltd | Financial services | 2007 |
| Just for YOU (Dereham) Ltd | Wholesale & retail | 2014 |
| Just Group Companies Ltd | Administrative & support | 2020 |
| Just Helping Children | Health & social care | 2015 |
| Just Made for YOU Limited | Extraterritorial | 2017 |
| Just Pass Driving School Ltd | Education | 2019 |
| Just Plastics Limited | Manufacturing | 1968 |
| Just Shoot Film Ltd | Professional & scientific | 2024 |
| Just Summit Ltd | Information & communication | 2024 |
| Just Wave Taxis Ltd | Transport & logistics | 2023 |
| JUST4SOFAS Ltd | Extraterritorial | 2023 |
| JUST50 Ltd | Real estate | 2026 |
| Justcarjobs Limited | Extraterritorial | 2007 |
| Justeb Ltd | Administrative & support | 2025 |
| Justified AI Ltd | Information & communication | 2023 |
| Justin Cogman Landscaping Limited | Administrative & support | 2014 |
| Justin Unsworth Ltd | Hospitality | 2018 |
| Justserv Ltd | Administrative & support | 2021 |
| Justw Consulting Limited | Administrative & support | 2017 |
| Juventas Services Limited | Health & social care | 2015 |
| JVA & AA Limited | Health & social care | 2024 |
| JVE Ltd | Information & communication | 2012 |
| JW Aero Consulting Ltd | Transport & logistics | 2014 |
| JW Bespoke Joinery Ltd | Manufacturing | 2017 |
| JW Consults Limited | Professional & scientific | 2025 |
| JW Food Safety Consultancy Ltd | Professional & scientific | 2014 |
| JW Metal Recycling Ltd | Wholesale & retail | 2025 |
| JW SAP Solutions Limited | Information & communication | 2012 |
| Jwatts Electrical Ltd | Other services | 2020 |
| JWB Media Ltd | Professional & scientific | 2026 |
| JWB Property Services Limited | Construction | 2012 |
| JWD Plumbing & Heating (Norfolk) Ltd | Construction | 2021 |
| JWF Metalworkers Limited | Manufacturing | 2002 |
| JWP Properties (EA) Ltd | Real estate | 2014 |
| JXR Logistics Ltd | Transport & logistics | 2024 |
| JY Safety Group Ltd | Administrative & support | 2026 |
| JZI Consulting Ltd | Administrative & support | 2018 |
| K & C Living Solutions Ltd | Health & social care | 2026 |
| K & D Ellis Limited | Wholesale & retail | 2021 |
| K & K Electrical Limited | Construction | 2009 |
| K & M Gedge Ltd | Agriculture & fishing | 2005 |
| K & M Properties (East Anglia) Limited | Real estate | 2019 |
| K & N Fencing Ltd | Construction | 2023 |
| K & P Autos Ltd | Wholesale & retail | 2014 |
| K & S Cooper (Holdings) Limited | Real estate | 2022 |
| K @ M Trading Ltd | Wholesale & retail | 2019 |
| K a Gale Ltd | Real estate | 2020 |
| K B Fibreglass Ltd | Manufacturing | 2026 |
| K B Integration Limited | Professional & scientific | 2017 |
| K Baker Builder Limited | Construction | 2008 |
| K Betts Groundworks Ltd | Construction | 2019 |
| K Clarke Motors Ltd | Wholesale & retail | 2019 |
| K D Rivers Limited | Construction | 2002 |
| K Falconer Consulting Limited | Professional & scientific | 2012 |
| K G Properties (Anglia) Ltd | Real estate | 2024 |
| K Harper Signs Ltd | Professional & scientific | 2026 |
| K Hunter Fire Ltd | Public administration | 2024 |
| K I Roofing Ltd | Construction | 2023 |
| K J Vickery Building Consultancy Limited | Professional & scientific | 2016 |