| Jessie Jamieson MUA Ltd | Other services | 2024 |
| Jesus Church Ltd | Other services | 2026 |
| JET Clear Limited | Water & waste | 2013 |
| JET Coin One Ltd | Other services | 2023 |
| JET Technology Group Limited | Wholesale & retail | 2020 |
| Jetasco & Sons Limited | Wholesale & retail | 2016 |
| Jetbuild Limited | Real estate | 2008 |
| Jetstream Drainage AP Ltd | Construction | 2024 |
| Jett Deia Holdings Limited | Financial services | 2025 |
| Jetts Properties Limited | Real estate | 2024 |
| Jevtech Limited | Administrative & support | 2023 |
| Jewel Delight Ltd | Wholesale & retail | 2025 |
| Jewellery Ltd | Wholesale & retail | 2002 |
| Jewels Properties Ltd | Real estate | 2024 |
| Jeyani Ltd | Wholesale & retail | 2025 |
| JF Elec Ltd | Energy | 2020 |
| JF Electrics Ltd | Construction | 2019 |
| JF Media Group Ltd | Information & communication | 2022 |
| JF Property Trading Limited | Real estate | 2020 |
| JF Rail Ltd | Construction | 2023 |
| Jf&F Limited | Real estate | 2025 |
| JF30 Limited | Arts & recreation | 2021 |
| JFA Communications Limited | Information & communication | 2013 |
| JFB Electrics Ltd | Construction | 2025 |
| JFB Joinery Ltd | Construction | 2020 |
| Jfcb Management Limited | Other services | 2018 |
| JFD Holdings Ltd | Health & social care | 2017 |
| JFJ LF Limited | Wholesale & retail | 2024 |
| JFK Plumbing Limited | Construction | 2012 |
| JFK Property Enterprise Ltd | Real estate | 2020 |
| Jfloodcare Limited | Public administration | 2025 |
| Jfly Consultancy Ltd | Professional & scientific | 2025 |
| JFM Global Trade Limited | Wholesale & retail | 2013 |
| JFM Sports & Leisure Ltd | Manufacturing | 2024 |
| JFM Training & Consultancy Ltd | Professional & scientific | 2024 |
| JFN Holdings Ltd | Real estate | 2026 |
| JFT Fire Protection Ltd | Construction | 2025 |
| JFT Studio Ltd | Information & communication | 2021 |
| JFW Estates Ltd | Construction | 2026 |
| JFW Property Ltd | Real estate | 2020 |
| JG Adult Social Care Partnership Ltd | Health & social care | 2024 |
| JG Cleaning Limited | Administrative & support | 2019 |
| JG Document Services Limited | Administrative & support | 2018 |
| JG Ground Investigation Ltd | Professional & scientific | 2026 |
| JG Heating Services Ltd | Construction | 2025 |
| JG INS Ltd | Other services | 2013 |
| JG Roofing & Guttering Ltd | Construction | 2026 |
| JG Sheils and Co Ltd | Professional & scientific | 2026 |
| JG Trees & Stumps Ltd | Administrative & support | 2024 |
| JG30 Limited | Real estate | 2025 |
| JGB Marketing Ltd | Administrative & support | 2016 |
| JGD Church RD Ltd | Real estate | 2025 |
| JGD Developments & Property Management Limited | Real estate | 2019 |
| Jgems Properties Ltd | Real estate | 2021 |
| JGJ 2012 Limited | Financial services | 2012 |
| JGJ Properties (NW) Ltd | Real estate | 2025 |
| JGL Construction Ltd | Construction | 2016 |
| Jgla Holdings Ltd | Financial services | 2024 |
| Jgla Ltd | Real estate | 2017 |
| Jgla Surveying Ltd | Professional & scientific | 2024 |
| JGM (NW) Ltd | Construction | 2014 |
| JGM Construction & Development Ltd | Real estate | 2024 |
| JGM Developments Ltd | Construction | 2016 |
| JGM Holdco Limited | Financial services | 2026 |
| JGM Project Services Ltd | Construction | 2023 |
| JGM TRAVEL1 Ltd | Transport & logistics | 2025 |
| Jgmp Dining Experiences Ltd | Hospitality | 2020 |
| Jgnut Limited | Real estate | 2026 |
| JGP Property Limited | Real estate | 2021 |
| JGR Global Investments Ltd | Real estate | 2018 |
| JGT Solutions Ltd | Professional & scientific | 2007 |
| JGW Business Consultants Ltd | Information & communication | 2022 |
| JH Assessing and Coaching Ltd | Other services | 2026 |
| JH Blue Ltd | Professional & scientific | 2022 |
| JH Cardiovascular Ltd | Real estate | 2019 |
| JH Clothing Ltd | Wholesale & retail | 2024 |
| JH Construction & Property Management Limited | Construction | 2024 |
| JH Logistics (NW) Ltd | Transport & logistics | 2026 |
| JH Partners (Emea) Company Limited | Administrative & support | 2023 |
| JH Partners (Europe) Company Limited | Administrative & support | 2024 |
| JH Skelmersdale Ltd | Arts & recreation | 2026 |
| JHB Builders Limited | Construction | 2019 |
| Jhelum UK Foods Ltd | Hospitality | 2024 |
| Jhewitt&Sons Ltd | Construction | 2023 |
| JHL Textiles Ltd | Manufacturing | 2023 |
| JHM QS Services Limited | Administrative & support | 2022 |
| Jhobson Ltd | Health & social care | 2022 |
| Jhpm Ltd | Construction | 2020 |
| JHR Building Services Limited | Construction | 2019 |
| Jhsk Marketing Ltd | Administrative & support | 2024 |
| JHT Digital Ltd | Wholesale & retail | 2024 |
| JHT Ventures Ltd | Financial services | 2025 |
| Jhtjoineryandbuilding Limited | Construction | 2025 |
| JHU Development Ltd | Wholesale & retail | 2023 |
| JHW Holdings Limited | Wholesale & retail | 2018 |
| Jian LIU Ltd | Hospitality | 2025 |
| Jianna Ltd | Professional & scientific | 2021 |
| Jianna Petchey Ltd | Health & social care | 2008 |
| Jiem Limited | Health & social care | 2024 |
| Jigsaw Coaching CIC | Professional & scientific | 2017 |