| Jeffrey & Gerard Limited | Construction | 2020 |
| Jelabel Ltd | Administrative & support | 2024 |
| JEM Accountancy Ltd | Professional & scientific | 2025 |
| JEM Commerce Limited | Manufacturing | 2021 |
| JEM Family Enterprises Limited | Education | 2025 |
| JEM Properties Investment LLP | | 2011 |
| JEM Tyres Limited | Manufacturing | 2003 |
| Jenesis 21 Ltd | Administrative & support | 2025 |
| Jenkins Joinery & Building Limited | Construction | 2021 |
| Jenkinson Business Solutions Ltd | Administrative & support | 2025 |
| Jenlee Properties Ltd | Real estate | 2022 |
| Jenmast Limited | Professional & scientific | 1996 |
| Jenna Louise Ltd | Health & social care | 2022 |
| Jennings Opticians Limited | Health & social care | 2005 |
| Jenratech Limited | Information & communication | 2022 |
| Jensen Tree Services Limited | Agriculture & fishing | 2020 |
| Jenuel Limited | Administrative & support | 2021 |
| Jenzo Garryn Ltd | Real estate | 2019 |
| JEP Youth Engagement Ltd | Education | 2020 |
| Jepson Holt Limited | Administrative & support | 2004 |
| Jerome Costigan Ltd | Transport & logistics | 2025 |
| Jervandan Limited | Health & social care | 2023 |
| Jessamy Platinum Holdings Limited | Financial services | 2025 |
| Jessamy Staffing Solutions Limited | Administrative & support | 2020 |
| Jessamy Vanguard Transport Services Limited | Transport & logistics | 2025 |
| Jessamycareone IP Limited | Information & communication | 2025 |
| Jessica Wear Ltd | Wholesale & retail | 2026 |
| Jessy Shibu Ltd | Health & social care | 2014 |
| JET3 Limited | Construction | 2023 |
| Jetfair Limited | Administrative & support | 2025 |
| Jetkins Limited | Information & communication | 2007 |
| Jetset Competitions Limited | Arts & recreation | 2024 |
| Jetset Go Competitions Limited | Arts & recreation | 2025 |
| Jewel Home Support Ltd | Health & social care | 2012 |
| Jewel Real Estates Ltd | Real estate | 2026 |
| Jewelglen Limited | Health & social care | 1991 |
| Jewellery Direct (North West) Limited | Manufacturing | 1999 |
| JF Foundation | Extraterritorial | 2012 |
| JF Link (UK) Limited | Construction | 2023 |
| JF Property and Investments Ltd | Real estate | 2024 |
| Jf&T Creative Ltd | Manufacturing | 2026 |
| JFK Bedrooms Ltd | Construction | 2019 |
| Jflemingphysio Ltd | Health & social care | 2022 |
| JG Development Services Limited | Information & communication | 2015 |
| JG Distribution Limited | Wholesale & retail | 2020 |
| JG Engineering & Maintenance Services Ltd | Manufacturing | 2025 |
| JG Inc Ltd | Wholesale & retail | 2023 |
| JG Property Maintenance (NW) Limited | Construction | 2018 |
| JG Sales Consulting Ltd | Information & communication | 2024 |
| JGA Capital Limited | Arts & recreation | 2020 |
| Jgcf Investments Ltd | Financial services | 2021 |
| JGM Marketing Ltd | Extraterritorial | 2000 |
| JGS Roofing Services Ltd | Construction | 2024 |
| Jgsports Wholesale Ltd | Wholesale & retail | 2022 |
| JGT Construction Ltd | Construction | 2024 |
| JH Connect Limited | Information & communication | 2024 |
| JH Education Consultancy Limited | Education | 2016 |
| JH Star Trading Ltd | Information & communication | 2023 |
| JH TV and Film Rigging Ltd | Construction | 2024 |
| Jhari KAS Enterprises Ltd | Real estate | 2024 |
| JHC Properties NW Ltd | Real estate | 2026 |
| Jhconstruction NW Ltd | Construction | 2019 |
| Jhip Limited | Real estate | 2025 |
| JHK Property Limited | Real estate | 2022 |
| Jhonbuildingsolution Ltd | Construction | 2025 |
| JHP Logistics Ltd | Transport & logistics | 2025 |
| JHS Holdings NW Limited | Financial services | 2024 |
| Jhun and Tess Company Limited | Health & social care | 2020 |
| JI NW Vehicles Ltd | Wholesale & retail | 2025 |
| JIA Software Limited | Information & communication | 2019 |
| JIB Structures Limited | Manufacturing | 2020 |
| JIE Zheng Consulting Limited | Information & communication | 2018 |
| Jifba Limited | Wholesale & retail | 2025 |
| Jiffy Products Ltd | Wholesale & retail | 2025 |
| Jigsaw Furniture NW Ltd | Wholesale & retail | 2024 |
| Jigsaw Professional Services Limited | Professional & scientific | 2026 |
| Jigsaw Property Services Limited | Construction | 2025 |
| JII Limited | Wholesale & retail | 2018 |
| Jila Financial Services Ltd | Financial services | 2021 |
| Jimcon Limited | Construction | 2018 |
| Jimenez Surgical Services Ltd | Health & social care | 2026 |
| Jimmys Hand Car Wash NW Ltd | Administrative & support | 2021 |
| JIN Foods Limited | Hospitality | 2022 |
| Jing JAI Thai Ltd | Hospitality | 2025 |
| Jiran Locuming Limited | Health & social care | 2021 |
| Jironelle Integrated Ltd | Wholesale & retail | 2025 |
| Jiva Solicitors Limited | Professional & scientific | 2012 |
| JJ Haste Properties Limited | Real estate | 2020 |
| JJ Healthsolutions Limited | Health & social care | 2021 |
| Jjag Limited | Construction | 2020 |
| Jjbell Property Ltd | Real estate | 2025 |
| JJD Services Ltd | Transport & logistics | 2024 |
| Jjdesign Limited | Other services | 2023 |
| Jjdonnelly’S Ltd | Manufacturing | 2025 |
| JJG E-Commerce Ltd | Wholesale & retail | 2024 |
| JJG Exterior Cleaning Ltd | Administrative & support | 2025 |
| JJH Building Contractors Limited | Construction | 2003 |
| JJH Motors Ltd | Wholesale & retail | 2018 |
| Jjhl Holdings Limited | Financial services | 2025 |
| Jjjj Properties Ltd | Real estate | 2023 |