| Intent Property Limited | Real estate | 2017 |
| Intercept Marketing Ltd | Professional & scientific | 2020 |
| Intercultural Business Services Limited | Education | 2003 |
| Intergroup UK Limited | Administrative & support | 2009 |
| Interland UK Limited | Administrative & support | 1997 |
| International Artists Agency Limited | Arts & recreation | 2018 |
| Interplan Northwest Limited | Real estate | 2011 |
| Intrinsica Strategy Consulting Limited | Professional & scientific | 2021 |
| Inventis Design Ltd | Information & communication | 2016 |
| Invest DDL Ltd | Professional & scientific | 2020 |
| Investment UK Property Ltd | Real estate | 2023 |
| Investments DW Limited | Financial services | 2019 |
| Invictus Properties Ltd | Financial services | 2021 |
| Invisible Women Online Limited | Professional & scientific | 2023 |
| IOW Services Limited | Wholesale & retail | 2023 |
| IQ Aesthetics Limited | Health & social care | 2020 |
| Irish Albums Limited | Wholesale & retail | 2018 |
| ISK Engineering Ltd | Manufacturing | 2025 |
| Island Honey Limited | Agriculture & fishing | 2026 |
| IVP Holdings Limited | Financial services | 2026 |
| J Holden Haulage Services Limited | Transport & logistics | 2022 |
| J J Mullins Limited | Professional & scientific | 2006 |
| J L Civil Engineering Ltd | Construction | 2013 |
| J Leyland Ltd | Hospitality | 2025 |
| J Mcloughlin Limited | Construction | 2022 |
| J O Curriers Limited | Transport & logistics | 2023 |
| J Phillips Contractors Limited | Construction | 2023 |
| J R Monks Plumbing Services Ltd | Construction | 2023 |
| J S N Propeties Limited | Real estate | 2025 |
| J W Brierley Ltd | Construction | 2002 |
| J&M Professional Consultancy Services Ltd | Professional & scientific | 2023 |
| J&S Mackie Ltd | Hospitality | 2026 |
| J. J. Mullins (Commercial) Limited | Administrative & support | 2006 |
| J.E.T Investment Properties Ltd | Real estate | 2023 |
| J.T.Miller Limited | Transport & logistics | 1948 |
| JA Groundworkers Limited | Construction | 2018 |
| Jack Catterall Boxing Limited | Arts & recreation | 2015 |
| Jacks Pantry Ltd | Manufacturing | 2026 |
| Jade Angela Holdings Ltd | Financial services | 2025 |
| Jade Angela Properties Ltd | Administrative & support | 2025 |
| JAK Spedding Photography Limited | Professional & scientific | 2017 |
| James Alexander Tax Consultant Ltd | Professional & scientific | 2019 |
| James Lear Hairstylist Limited | Other services | 2024 |
| James Raymond Limited | Other services | 2024 |
| James Watts Holdings Limited | Financial services | 2018 |
| Janco Housing and Relocations Limited | Real estate | 2024 |
| Janco Retrofits Limited | Wholesale & retail | 2020 |
| Janco Supplies Limited | Wholesale & retail | 2016 |
| Japato Limited | Professional & scientific | 2020 |
| Japshop Limited | Extraterritorial | 2005 |
| JAQ Handyman Ltd | Construction | 2024 |
| Jawdata Limited | Information & communication | 2022 |
| JAX Detail Company Ltd | Wholesale & retail | 2021 |
| JB Roofing Ltd | Construction | 2015 |
| Jbfb Trade Ltd | Wholesale & retail | 2024 |
| JC Fibre Optics Ltd | Construction | 2019 |
| JCW Construction Ltd | Construction | 2013 |
| JCW Property Rentals Ltd | Households | 2026 |
| JDH Talent Consultancy Limited | Administrative & support | 2018 |
| JDL Training Limited | Education | 2011 |
| Jeaniee Hairtrix Ltd | Other services | 2025 |
| JEM Consultancy Services Ltd | Professional & scientific | 2022 |
| Jennifer Alice Ltd | Other services | 2022 |
| Jennifer's Pamper Rooms Limited | Other services | 2015 |
| Jenny Mather Ltd | Other services | 2021 |
| JEP Care, Respite & Outreach Limited | Health & social care | 2026 |
| JEP Leisure Limited | Arts & recreation | 2026 |
| Jepson P Limited | Wholesale & retail | 2020 |
| Jerath Williams Group Limited | Professional & scientific | 2017 |
| Jerk Station (Leigh) Limited | Hospitality | 2025 |
| Jess Turner Writes Ltd | Professional & scientific | 2021 |
| Jessica's K9 Kitchen Limited | Manufacturing | 2025 |
| JFH Holdings Limited | Professional & scientific | 2016 |
| JG and JR Metcalfe Limited | Agriculture & fishing | 2018 |
| JG Perfusion Services Limited | Health & social care | 2025 |
| Jido Group Ltd | Public administration | 2026 |
| Jigsaw Advisory Ltd | Professional & scientific | 2024 |
| Jisa Ventures Ltd | Education | 2025 |
| JJ Harwood Ltd | Construction | 2016 |
| JJD Construction NW Ltd | Construction | 2020 |
| JLB Barbers Ltd | Other services | 2024 |
| JLJ Transport Ltd | Transport & logistics | 2025 |
| JLK Electrical Contractors Ltd | Construction | 2026 |
| Jlon Investment Ltd | Professional & scientific | 2023 |
| Jlum Jointing Ltd | Construction | 2020 |
| JM Engineering Maintenance Limited | Professional & scientific | 2025 |
| JM Renewables North West Limited | Construction | 2025 |
| JMD Training Ltd | Education | 2025 |
| JME Aesthetics Limited | Other services | 2022 |
| Jnoah Consultancy Ltd | Professional & scientific | 2009 |
| JO Childs Personal Development Ltd | Professional & scientific | 2021 |
| JO Hunt Photography Ltd | Professional & scientific | 2025 |
| Joanne Bury Consultancy Limited | Professional & scientific | 2021 |
| JOE Roocroft (Holdings) Ltd | Financial services | 2004 |
| JOE Roocroft and Sons Limited | Construction | 1980 |
| Johanna Kelly PMU Limited | Other services | 2023 |
| John HY Mayor & Sons Limited | Manufacturing | 1939 |
| John Mcdougall Electrical Services Ltd. | Construction | 2002 |
| John Ramsay Physio Limited | Health & social care | 2015 |
| John Wignall Flat Roofing Specialist Ltd | Construction | 2024 |