| Impact Energy Holdings Limited | Financial services | 2024 |
| Impact Haus Ltd | Professional & scientific | 2025 |
| Impero Retail Limited | Wholesale & retail | 2022 |
| Implentis Limited | Administrative & support | 2013 |
| IN Another Place | Education | 2017 |
| Independant Consultancy Services Ltd | Real estate | 2019 |
| Independent Stocktaking Limited | Other services | 2011 |
| Indy Visuals Limited | Wholesale & retail | 2005 |
| Infinite Access Services Ltd | Construction | 2012 |
| Infinite Developments Ltd | Construction | 2023 |
| Inflamer Media Limited | Information & communication | 2020 |
| Infratech Projects Limited | Extraterritorial | 2017 |
| Inhome Solutions Ltd | Professional & scientific | 2024 |
| Inn Trade Limited | Hospitality | 2013 |
| Inspira Health Limited | Health & social care | 2015 |
| Inspiring Inclusive Practice Ltd | Education | 2024 |
| Instacam Limited | Administrative & support | 2019 |
| Integrity Property Group Ltd | Real estate | 2025 |
| Intek Projects Ltd | Construction | 2026 |
| Inter Marine Hotel Ltd | Construction | 2020 |
| Interim Solution Posty Ltd | Wholesale & retail | 2013 |
| International Waters Ltd | Construction | 2020 |
| Internet Malt UK Ltd | Wholesale & retail | 2005 |
| Investco Property Limited | Real estate | 2020 |
| Invisible Sun LED UK Ltd | Manufacturing | 2018 |
| Ipsoh LLP | | 2020 |
| Irabor Transport Limited | Transport & logistics | 2017 |
| Irvine's Body Shop Limited | Wholesale & retail | 2010 |
| Isis Creative Services C.I.C. | Manufacturing | 2013 |
| ITM Associates Limited | Professional & scientific | 2011 |
| Itrans Limited | Transport & logistics | 2019 |
| Ivinro Ltd | Wholesale & retail | 2021 |
| J & L Products Limited | Wholesale & retail | 2025 |
| J a Transport Liverpool Limited | Transport & logistics | 2021 |
| J H Tank Services Ltd | Transport & logistics | 2012 |
| J K Cool Limited | Hospitality | 2019 |
| J N M Co Ltd | Wholesale & retail | 2025 |
| J S Fleet Services Limited | Construction | 1995 |
| J&N Developments and Consultants Ltd | Construction | 2023 |
| J.E.T. Cleaning Equipment Solutions Ltd | Wholesale & retail | 2020 |
| J.P Bathrooms & Kitchens Merseyside Ltd | Construction | 2021 |
| J.T. Cargo Ltd | Transport & logistics | 2014 |
| J.W. Process Pipework Ltd | Construction | 2025 |
| JAB Developments (Liverpool) Limited | Construction | 2016 |
| Jackdaw Tools Limited | Wholesale & retail | 1994 |
| Jaidad Properties Limited | Construction | 2022 |
| James Kristian (Liverpool) Ltd | Real estate | 2024 |
| James Kristian Limited | Real estate | 2008 |
| James Mansfield Limited | Construction | 2018 |
| James Power Ltd | Information & communication | 2007 |
| James Power Marketing & Communications Limited | Professional & scientific | 2024 |
| Jamieson Holdings Limited | Administrative & support | 2023 |
| Jasmin & Co. Ltd | Hospitality | 2025 |
| JAX Cars Ltd | Wholesale & retail | 2019 |
| Jazx Ltd | Wholesale & retail | 2026 |
| JBC Ltd | Real estate | 2021 |
| JC Kitchens & Bathrooms Ltd | Construction | 2026 |
| JC Transit Solutions Ltd | Transport & logistics | 2024 |
| JCL (Birkdale) Limited | Hospitality | 2021 |
| JD Harris Leisure Limited | Hospitality | 2024 |
| JD Property Letting (Liverpool) Ltd | Real estate | 2021 |
| JDC Roofing Ltd | Construction | 2020 |
| Jdhv Ltd | Construction | 2025 |
| JDN Hire Ltd | Water & waste | 2018 |
| Jenil Limited | Wholesale & retail | 2020 |
| Jenkins Felixstowe Ltd | Transport & logistics | 2008 |
| Jenkins Port Services Ltd | Administrative & support | 2007 |
| Jenkins Shipping (GB) Limited | Transport & logistics | 2007 |
| Jenny Bidco Limited | Financial services | 2018 |
| Jenny Topco Limited | Financial services | 2018 |
| JER2911 Limited | Information & communication | 2014 |
| Jessegold Properties Ltd | Real estate | 2020 |
| JESSICA7 Ltd | Real estate | 2019 |
| JET Sales Ltd | Administrative & support | 2025 |
| JFM Builders NW Ltd | Construction | 2025 |
| JGS Architecture Limited | Professional & scientific | 2025 |
| Jireh Group Ltd. | Construction | 2017 |
| Jjaconsultants Limited | Households | 2026 |
| JJK Shed & Cabin Installations Ltd | Construction | 2024 |
| JK Rising Limited | Hospitality | 2021 |
| Jksa Property Limited | Real estate | 2023 |
| JL Next GEN Acadamy Ltd | Education | 2026 |
| JLC Management Services Limited | Construction | 2018 |
| JLC Roofing and Construction Limited | Construction | 2024 |
| JLM Cleaning Services Ltd | Administrative & support | 2022 |
| JM Professional Limited | Professional & scientific | 2019 |
| Jm&N Limited | Administrative & support | 2019 |
| JMB Insight Solutions Ltd | Professional & scientific | 2024 |
| JMC Wind Tech Ltd | Manufacturing | 2025 |
| JMD Real Estate Ltd | Real estate | 2022 |
| JML Inspection & Maintenance Ltd | Real estate | 2023 |
| JMO Car Sales Ltd | Wholesale & retail | 2024 |
| Jntnsnts Limited | Information & communication | 2025 |
| JOE Black Coffee Roasters Ltd | Wholesale & retail | 2021 |
| John Bucko Ltd | Information & communication | 2020 |
| John Sutch Cranes Limited | Construction | 2012 |
| John Teire Property Limited | Real estate | 2021 |
| JOHNSON246 Limited | Health & social care | 2023 |
| Johson E Limited | Administrative & support | 2016 |
| Jones Security Ltd | Administrative & support | 2023 |