| Italian Southport Limited | Hospitality | 2021 |
| ITZ Home Global Limited | Professional & scientific | 2024 |
| ITZ Home Holdings Limited | Administrative & support | 2024 |
| ITZ Home Limited | Information & communication | 2024 |
| IW Groundworks & Civils Ltd | Construction | 2022 |
| IW Services Limited | Professional & scientific | 2008 |
| Ixtech Limited | Professional & scientific | 2002 |
| J & a Consultancy Services Limited | Professional & scientific | 2018 |
| J & D Webster Limited | Agriculture & fishing | 2010 |
| J & M T Properties Limited | Real estate | 2001 |
| J and M Kenyon Limited | Households | 2025 |
| J and M Morgan Engineering Holdings Limited | Financial services | 2023 |
| J Anderson Property Ltd | Real estate | 2025 |
| J Bay Properties Ltd. | Real estate | 2025 |
| J L Johnson Properties Ltd | Real estate | 2024 |
| J R & R Prescott Limited | Agriculture & fishing | 2011 |
| J Robinson & Co Removals Ltd | Transport & logistics | 2023 |
| J Rothwell & SON Limited | Real estate | 1977 |
| J V + S H Rowland + Sons | | 1997 |
| J W Estate Agents Ltd | Real estate | 2026 |
| J Walsh Construction Ltd | Construction | 2021 |
| J Wilson Properties Limited | Professional & scientific | 2021 |
| J&M Kelly Transport Logistics Ltd | Transport & logistics | 2025 |
| J. Banister Limited | Construction | 2013 |
| J.E. Gardner Group Limited | Real estate | 1971 |
| J.M. Mechanical Services (NW) Ltd | Construction | 2011 |
| J2 Flooring Limited | Wholesale & retail | 1998 |
| J7 Architecture & Design Ltd | Professional & scientific | 2025 |
| Jackson Project Services Ltd | Construction | 2026 |
| Jacs Enterprise Ltd | Wholesale & retail | 2022 |
| Jadesbites Limited | Information & communication | 2023 |
| Jaeger Consultancy Services Ltd. | Professional & scientific | 2016 |
| Jake Dunn Limited | Professional & scientific | 2024 |
| Jake Williams Automotives Ltd | Wholesale & retail | 2019 |
| James Jeffers Executive Travel Limited | Transport & logistics | 2017 |
| James Wignall Limited | Construction | 2025 |
| Jamm Studios Agency Limited | Other services | 2021 |
| Jamm Studios Limited | Other services | 2012 |
| Jamm Studios Productions Limited | Other services | 2021 |
| Jampot Properties Ltd | Real estate | 2019 |
| Jannac Limited | Administrative & support | 2024 |
| Jarron Energy Limited | Wholesale & retail | 2013 |
| Jarron Holdings Limited | Administrative & support | 2016 |
| Jarron Investments Limited | Real estate | 2001 |
| Jarron Limited | Wholesale & retail | 2000 |
| Jasall Properties Limited | Real estate | 2025 |
| Jaybank Properties Limited | Real estate | 1999 |
| Jayzee Ltd | Households | 2026 |
| JBA Electrictech Limited | Construction | 2013 |
| JBS Care Ltd | Other services | 2025 |
| JBS Northwest Ltd | Hospitality | 2024 |
| JC Beauty Treatments Limited | Other services | 2025 |
| JC Hospitality Limited | Extraterritorial | 2018 |
| JCK Housing Limited | Real estate | 2019 |
| Jckpi Limited | Administrative & support | 2021 |
| JD Assessments Ltd | Construction | 2026 |
| JDF Racing Limited | Arts & recreation | 2008 |
| Jean Sambrooks LLP | | 2006 |
| Jeff Draper and Sons Limited | Construction | 2018 |
| Jenny Jensen Ltd | Professional & scientific | 2024 |
| Jerrys Sensory Toys Ltd | Wholesale & retail | 2026 |
| Jessgossmedical Limited | Health & social care | 2022 |
| JET Transport Management Ltd | Professional & scientific | 2026 |
| Jevans Rope Access Ltd | Construction | 2025 |
| JGB Contracts Ltd | Transport & logistics | 2014 |
| JHP Media Ltd | Information & communication | 2021 |
| JJ Holidays Limited | Administrative & support | 2026 |
| Jjeb Properties Limited | Real estate | 2025 |
| Jjlb Commercial Properties Ltd | Real estate | 2021 |
| Jjlb Properties Ltd | Real estate | 2021 |
| JJS Jungle Ltd | Hospitality | 2019 |
| JJW Electrics Ltd | Construction | 2018 |
| JMJ Cottages Ltd | Hospitality | 2018 |
| JMM Property Group Limited | Real estate | 2026 |
| Jmor Family Limited | Real estate | 2017 |
| JMT Properties (North West) Ltd | Construction | 2015 |
| Joanna Naughton Limited | Professional & scientific | 2021 |
| Joanne Eddon Textiles Limited | Manufacturing | 2026 |
| Joanne Pretten Neurological Physiotherapy Limited | Health & social care | 2016 |
| JOB Deck Ltd | Information & communication | 2019 |
| Jobdun Joinery Ltd | Construction | 2012 |
| Jobshake Limited | Information & communication | 2026 |
| Jody Tedham Groundworx Limited | Construction | 2021 |
| John Highet Property Limited | Other services | 2005 |
| John Hurst & Sons Limited | Agriculture & fishing | 2025 |
| John Iddon Transport Ltd | Transport & logistics | 2010 |
| John J Finances Ltd | Administrative & support | 2015 |
| Johnsons (Burscough) Limited | Transport & logistics | 1967 |
| Johnston Vere Consultancy Ltd | Information & communication | 1999 |
| Jolie Maison Developments Limited | Construction | 2025 |
| Joseph F Stevens Financial Planning Limited | Financial services | 2013 |
| Joseph's Bespoke Joinery Ltd | Construction | 2025 |
| Joyful Beginnings Ltd | Wholesale & retail | 2025 |
| JP Investments NW Ltd | Real estate | 2023 |
| JP Travel (Ormskirk) Ltd | Transport & logistics | 2013 |
| JPC Lettings Ltd | Real estate | 2025 |
| JPG Consultancy Services Ltd | Professional & scientific | 2016 |
| JPS Automotive Ltd | Wholesale & retail | 2014 |
| JR Carter Engineering Ltd | Construction | 2025 |
| JR Skincare Ltd | Other services | 2024 |