| Innosolve Consulting Limited | Information & communication | 2020 |
| Innovate Volunteering CIC | Health & social care | 2011 |
| Innovative Pipesystems Limited | Manufacturing | 2008 |
| Instant Pest Solutions Ltd | Administrative & support | 2009 |
| Insulation Product Services (Holdings) Limited | Other services | 2010 |
| Insulation Product Services Limited | Construction | 2001 |
| Integrated Management & Design Services Ltd | Professional & scientific | 2010 |
| Intergrated Communication Systems Limited | Construction | 2000 |
| Intermobil S.R.L. Ltd | Wholesale & retail | 2017 |
| Intet Ltd | Wholesale & retail | 2023 |
| Intuit Solutions Limited | Professional & scientific | 2017 |
| IPD Holdings Limited | Financial services | 2022 |
| IPS Marine Fabrications Ltd | Construction | 2010 |
| IPS Marine Holdings Limited | Other services | 2023 |
| IRL Plastering Ltd | Construction | 2024 |
| Ironbrick Properties Ltd | Real estate | 2023 |
| IT 4 Grannies Ltd | Information & communication | 2025 |
| IT Management Delivery Specialists Ltd | Information & communication | 2023 |
| IVY Ventures Ltd | Hospitality | 2016 |
| IW Resources Limited | Professional & scientific | 2025 |
| J + P Road Surfacing Limited | Construction | 2005 |
| J a Langton Limited | Construction | 2010 |
| J and L Supplies (North West) Ltd | Wholesale & retail | 2009 |
| J and S PROPERTY-2025 Limited | Construction | 2025 |
| J&B Market Ltd | Wholesale & retail | 2021 |
| J&H Northwest Limited | Wholesale & retail | 2011 |
| J. G. I. Walsh Limited | Construction | 2015 |
| J.B.J. Insulations Limited | Construction | 1992 |
| J.Casson Telecoms Ltd | Information & communication | 2026 |
| JA Graham Logistics Consultancy Limited | Professional & scientific | 2018 |
| Jackson Cooper Limited | Administrative & support | 2009 |
| Jackson Cooper Partnership Limited | Professional & scientific | 2020 |
| Jaka 2 Ltd | Hospitality | 2023 |
| Jaka 3 Ltd | Hospitality | 2023 |
| Jaka Ltd | Hospitality | 2019 |
| James Roche Ltd | Transport & logistics | 2023 |
| JAN Simpson Ltd | Administrative & support | 2014 |
| Jaxon John Ltd | Other services | 2020 |
| Jayne Ward Consultancy Limited | Professional & scientific | 2021 |
| JB Engineering Consultancy Limited | Professional & scientific | 2023 |
| JB Pressure Washing Ltd | Administrative & support | 2024 |
| JC Property and Maixtenance Ltd | Real estate | 2026 |
| JC Transport Serviced Limited | Transport & logistics | 2025 |
| JCT Roofing Ltd | Construction | 2024 |
| JCW Print Solutions Limited | Manufacturing | 2009 |
| JD GUT Health Ltd | Wholesale & retail | 2026 |
| JD Supps Limited | Wholesale & retail | 2025 |
| Jeegha Golf Limited | Wholesale & retail | 2024 |
| Jemvic.Co.Uk Limited | Health & social care | 2025 |
| Jemvicclothings.Co.Uk Ltd | Wholesale & retail | 2025 |
| Jenjo Care Ltd | Health & social care | 2025 |
| Jennor (U.K.) Ltd. | Construction | 1982 |
| JES Refrigeration Limited | Manufacturing | 2002 |
| Jessies Jewels Limited | Wholesale & retail | 2015 |
| Jetwash Liverpool Ltd | Administrative & support | 2025 |
| Jeyam Store Ltd | Wholesale & retail | 2025 |
| JF Living Limited | Health & social care | 2021 |
| JF Nominees Limited | Extraterritorial | 2009 |
| Jgtl Limited | Real estate | 2025 |
| JH Blade Repair Ltd | Manufacturing | 2022 |
| JHD Joinery Ltd | Construction | 2026 |
| JI Innovations Ltd | Health & social care | 2025 |
| Jilly’S Coffee & Dine Ltd | Hospitality | 2020 |
| JJ Property Maintenance Lpool Limited | Construction | 2023 |
| JJ Tower Property Ltd | Households | 2025 |
| Jjelite Joinery and Building Ltd | Construction | 2023 |
| Jjlm Ltd | Real estate | 2023 |
| JJM Services and Exports Limited | Transport & logistics | 2020 |
| JKD Building Services Ltd | Construction | 2026 |
| JLO Holdings Limited | Financial services | 2009 |
| JLT Motors Ltd | Wholesale & retail | 2023 |
| JMG Independent Consulting Ltd | Health & social care | 2021 |
| JNF Telecom Limited | Administrative & support | 2022 |
| Joann Wainwright Beauty Ltd | Other services | 2025 |
| Johanson Property Holdings Ltd | Real estate | 2026 |
| John F. S. Limited | Administrative & support | 2024 |
| Johns Farming Limited | Agriculture & fishing | 2013 |
| JOK Holdings Ltd | Financial services | 2025 |
| Jonas Properties Limited | Real estate | 2016 |
| Jonas Property Group Ltd | Real estate | 2025 |
| Jonas Property Holdings Limited | Real estate | 2025 |
| Jones & Dean Construction Ltd | Construction | 2015 |
| Jordan Coordinations Ltd | Administrative & support | 2024 |
| Joseph Stocks Management & Consultancy Ltd | Professional & scientific | 2021 |
| Josh Hagendyk Ltd | Health & social care | 2017 |
| JOT Maintenance Ltd | Administrative & support | 2024 |
| Joyce European Logistics Ltd | Transport & logistics | 2012 |
| Joyce Lester Construction Ltd | Manufacturing | 2019 |
| Joyful Journeys Together Limited | Health & social care | 2025 |
| JP Fleet Support Ltd | Wholesale & retail | 2022 |
| JP Property Management Services Ltd | Real estate | 2005 |
| Jproadsurfacing Property Ltd | Real estate | 2018 |
| JPU Maintenance Ltd | Administrative & support | 2023 |
| Jrflow AI Limited | Professional & scientific | 2025 |
| JRH Telecom Ltd | Information & communication | 2023 |
| JS Aesthetics Limited | Other services | 2015 |
| JS Contracts North West Ltd | Construction | 2021 |
| JSE Management Limited | Arts & recreation | 2016 |
| JSK Supported Living Ltd | Health & social care | 2025 |
| Jtech Industrial Controls Limited | Professional & scientific | 2024 |