| JC Rope RIG Ltd | Construction | 2026 |
| JC Wholesale UK Ltd | Wholesale & retail | 2024 |
| JCH1 Ltd | Hospitality | 2026 |
| JCM Telecoms Ltd | Information & communication | 2024 |
| JCS Residential Ltd | Real estate | 2020 |
| Jcuhvs Limited | Hospitality | 2009 |
| Jc’S Commercial Sprayers Midlands Limited | Wholesale & retail | 2023 |
| JD (NE) Executive Ltd | Transport & logistics | 2026 |
| JD Belle VUE Dinner Ltd | Hospitality | 2022 |
| JD Catering Solutions Ltd | Hospitality | 2022 |
| JD UK Enterprises Ltd | Information & communication | 2022 |
| JDC Builders LLP | | 2010 |
| JDC Building Solutions LLP | | 2018 |
| Jdda Media Limited | Information & communication | 2019 |
| Jdeco International Ltd | Professional & scientific | 2023 |
| JDH Commissioning Ltd | Professional & scientific | 2026 |
| JDH E&I Services Ltd | Professional & scientific | 2017 |
| Jdmc Ltd | Real estate | 2025 |
| JDO Property Rentals Ltd | Real estate | 2016 |
| Jdppc Ltd | Hospitality | 2026 |
| JDR Bricklaying and Groundwork Ltd | Construction | 2025 |
| JDR Electrical Services Limited | Construction | 2025 |
| JDS Inspections Ltd | Professional & scientific | 2024 |
| Jeaf Enterprises Ltd | Wholesale & retail | 2025 |
| Jeanette Hall Ltd | Hospitality | 2024 |
| Jeanie Electrical Ltd | Construction | 2025 |
| Jeave 3 Limited | Extraterritorial | 2010 |
| Jedford Ltd | Wholesale & retail | 2003 |
| Jeff the Chef Foods Limited | Manufacturing | 2007 |
| Jeff Tortoise Limited | Professional & scientific | 2007 |
| Jeffery Building Products Limited | Wholesale & retail | 2007 |
| JEG Engineering Services Ltd | Construction | 2019 |
| JEM ENG Ltd | Professional & scientific | 2020 |
| Jem-Site Machining Ltd | Manufacturing | 2026 |
| Jensis Limited | Professional & scientific | 2012 |
| Jentone Freight Limited | Transport & logistics | 1998 |
| Jerry Winston Limited | Real estate | 2015 |
| Jespaintworks Ltd | Wholesale & retail | 2025 |
| Jessica Meehan Ltd | Financial services | 2026 |
| Jesters Equine Ltd | Agriculture & fishing | 2016 |
| JET2E Ltd | Transport & logistics | 2013 |
| JF Couriers Limited | Transport & logistics | 2015 |
| JF Deliveries Ltd | Transport & logistics | 2025 |
| JF North East Electrical Ltd | Construction | 2024 |
| JF Recycling Limited | Wholesale & retail | 2025 |
| JFC Development Limited | Arts & recreation | 2015 |
| JFD Petrochemicals Limited | Professional & scientific | 2025 |
| JFH Engineering Ltd | Professional & scientific | 2022 |
| JFL Motor Group Ltd | Professional & scientific | 2026 |
| JGB Industries Ltd | Manufacturing | 2026 |
| JGB Marine Services Ltd | Transport & logistics | 2019 |
| JGP Group Ltd | Wholesale & retail | 2019 |
| Jgsuk Ltd | Professional & scientific | 2018 |
| JH International Software Limited | Information & communication | 2022 |
| JH Piping Consultant Ltd | Manufacturing | 2023 |
| JH Pubs Ltd | Hospitality | 2017 |
| JHA Private Limited | Health & social care | 2012 |
| JHG Engineering Ltd | Professional & scientific | 2017 |
| Jhlab Property Investment Ltd | Real estate | 2025 |
| JHM Psychological Services Ltd | Health & social care | 2023 |
| Jhowson Parcels Limited | Transport & logistics | 2026 |
| Jigsaw Safety & Design Limited | Public administration | 2015 |
| JIH Group Ltd | Financial services | 2018 |
| Jiief Limited | Financial services | 2025 |
| Jilcostumes Ltd | Professional & scientific | 2025 |
| Jillani & Bros Ltd | Wholesale & retail | 2022 |
| Jimbobs Trailer Ltd | Hospitality | 2023 |
| Jimkon Ltd | Wholesale & retail | 2019 |
| Jimmyfewmech and Safety Services Ltd | Construction | 2017 |
| JJ Middlesbrough Limited | Hospitality | 2019 |
| Jjbo Developments Limited | Real estate | 2024 |
| JJC Industrial Service's Ltd | Professional & scientific | 2023 |
| JJF Inspections Ltd | Professional & scientific | 2025 |
| JJJ Commercial Services Limited | Professional & scientific | 2016 |
| JJL Completions Limited | Professional & scientific | 2025 |
| JJP Estimating Services Ltd | Professional & scientific | 2023 |
| JJP Fabrication Ltd | Manufacturing | 2026 |
| JJS Engineering (NE) Ltd | Construction | 2026 |
| JJT Property Management Ltd | Real estate | 2020 |
| JK Construction and Management Limited | Professional & scientific | 2019 |
| JK Delivery Services UK Limited | Wholesale & retail | 2025 |
| JK Infotech Ltd | Information & communication | 2021 |
| JK Mini Market Ltd | Wholesale & retail | 2019 |
| JK Recycling Ltd | Wholesale & retail | 2013 |
| JK9 Security Ltd | Administrative & support | 2025 |
| JKB HV Solutions Ltd | Construction | 2026 |
| JKE Management Ltd | Real estate | 2022 |
| JKL Pro Beauty and Aesthetics Academy Ltd | Education | 2023 |
| JKT Design Ltd | Professional & scientific | 2025 |
| JL Inspection Limited | Professional & scientific | 2013 |
| JL Kidz Ltd | Wholesale & retail | 2024 |
| Jlangley Engineering Limited | Manufacturing | 2017 |
| JLB Property Solutions Ltd | Real estate | 2023 |
| JLC Project Planning Services Limited | Professional & scientific | 2018 |
| Jlcons Ltd | Information & communication | 2024 |
| JLD Inspection Limited | Professional & scientific | 2021 |
| JLG Rigging and Lifting Services Limited | Professional & scientific | 2015 |
| JLG Rigtech Ltd | Construction | 2024 |
| JLH Engineering Northeast Ltd | Professional & scientific | 2025 |
| JLJ Rope Access Services Ltd | Construction | 2019 |