| Internet Pharmacy Limited | Wholesale & retail | 2000 |
| Intex Hawkshaw Limited | Professional & scientific | 2002 |
| Investment Property Marketing Ltd | Financial services | 2004 |
| IP Data Solutions Limited | Information & communication | 2005 |
| Iprint Ltd | Manufacturing | 2007 |
| Irlam Sheet Metal Company Limited | Manufacturing | 1976 |
| Iroko Design Limited | Information & communication | 2002 |
| Islamic Book Centre Limited | Wholesale & retail | 2003 |
| Isra Developments Limited | Construction | 1999 |
| IT Services (North West) Limited | Information & communication | 2007 |
| J & a Group Limited | Financial services | 2007 |
| J & H Property Investments Ltd | Real estate | 2003 |
| J & I Brierley Developments Ltd | Real estate | 2018 |
| J & M Assurance Consultants Limited | Professional & scientific | 2005 |
| J & P Vehicle Deliveries Limited | Transport & logistics | 2003 |
| J Armor Limited | Construction | 1959 |
| J B GAS and Electrical Services Ltd | Construction | 2004 |
| J C C Services Limited | Public administration | 2002 |
| J C Critchley Limited | Transport & logistics | 2003 |
| J G T Plumbing Ltd | Construction | 2005 |
| J G Warhurst Limited | Agriculture & fishing | 2002 |
| J Hall & Co Limited | Professional & scientific | 2003 |
| J K Guest Utility Mapping Solutions Limited | Other services | 2008 |
| J K P Investments Limited | Real estate | 1999 |
| J M Financial Management Ltd. | Financial services | 2002 |
| J P R Electrical Solutions Ltd | Construction | 2004 |
| J S Leach & Sons Limited | Water & waste | 2006 |
| J&S Kemp Limited | Other services | 2005 |
| J. & a. KAY Limited | Manufacturing | 1957 |
| J. & T. Livesey (Accrington) Limited | Wholesale & retail | 1956 |
| J. Cook Electrical Contractors Limited | Construction | 2008 |
| J.B. Motors (Longton) Limited | Wholesale & retail | 2014 |
| J.Taylor (Electrical Contractors) Limited | Construction | 1948 |
| J.V.K. Engineers (Bolton) Limited | Manufacturing | 1983 |
| J2 Aircraft Dynamics Ltd | Information & communication | 2006 |
| Jack Smith & Sons Limited | Construction | 2002 |
| Jack Transport Limited | Transport & logistics | 2002 |
| Jacob Anderson Limited | Health & social care | 2006 |
| JAF Fitted Interiors Ltd | Construction | 2006 |
| Jagger & Associates Limited | Financial services | 1999 |
| JAM & Brooks Gifts Limited | Wholesale & retail | 2002 |
| Jambre Limited | Construction | 2019 |
| James Brearley Crest Nominees Limited | Professional & scientific | 1996 |
| James Gardner Limited | Agriculture & fishing | 2002 |
| James Gibson (Darwen) Ltd. | Wholesale & retail | 1996 |
| James Greenhough (Holdings) Limited | Real estate | 1980 |
| James MC Limited | Wholesale & retail | 2005 |
| Janine Hair and Beauty Limited | Other services | 2004 |
| Jason Medd Swim School Ltd | Education | 2003 |
| Jaxon School of Motoring Limited | Education | 2002 |
| Jaysynth (Europe) Limited | Wholesale & retail | 1994 |
| JB Wall & Floor Tiling Limited | Construction | 2007 |
| JBI Limited | Wholesale & retail | 1943 |
| Jcbradshaw Holdings Ltd | Financial services | 2022 |
| JCD IT Consultants Ltd | Information & communication | 2018 |
| Jcgc Limited | Professional & scientific | 2006 |
| JDS (Blackburn) Limited | Extraterritorial | 2003 |
| Jeff Stone Hairdressing | | 2000 |
| JEM Logistics Limited | Transport & logistics | 2006 |
| Jensham Ltd | Hospitality | 2001 |
| Jenshaw Limited | Construction | 2003 |
| Jets Medical Ltd | Health & social care | 2003 |
| Jglm Limited | Administrative & support | 2002 |
| Jigsaw Funding PLC | Financial services | 2022 |
| Jigsaw M2M Ltd | Information & communication | 2007 |
| JIM Kelly & Company Limited | Financial services | 1973 |
| JIM Meechan GAS Services Limited | Construction | 2008 |
| JJ Management (Leeds) Ltd | Financial services | 2025 |
| JJ Shaw & Associates Ltd | Other services | 2021 |
| JKN Digital Limited | Administrative & support | 1999 |
| JNJ Mental Health Nurse Limited | Health & social care | 2025 |
| Joanne Fairbrother Language Tuition Limited | Information & communication | 2012 |
| JOB Filtration UK Limited | Manufacturing | 1970 |
| John Ardern & Company Limited | Real estate | 1999 |
| John Ashton Joinery Ltd | Manufacturing | 2007 |
| John Blanche Limited | Construction | 2007 |
| John C Carr Limited | Construction | 2002 |
| John Clarkson Painting & Decorating Limited | Construction | 2003 |
| John D. Allen Ltd | Construction | 2003 |
| John Dalziel (Meats) Limited | Wholesale & retail | 1985 |
| John Fenton Training Limited | Education | 1996 |
| John Gleave Limited | Construction | 2003 |
| John Hall & SON (Blackpool) Limited | Real estate | 1955 |
| John Holt Architects Limited | Professional & scientific | 2007 |
| John Mcewen Limited | Households | 2003 |
| John Roscoe Electrical Limited | Construction | 2006 |
| John Sales (Design & Engineering) Limited | Professional & scientific | 2007 |
| John Taylor Agencies Limited | Administrative & support | 2002 |
| Johnson Hairdressing Ltd | Other services | 2007 |
| Johnston Bros. (Hire Cars) Limited | Real estate | 1957 |
| Johnston Pharmacy Ltd | Professional & scientific | 2003 |
| JON Cuff Electrical Limited | Construction | 2003 |
| Jonathan Beebe Ltd | Information & communication | 2006 |
| Jones Harris Limited | Administrative & support | 1996 |
| Jordan Electrical and Mechanical Services Ltd | Professional & scientific | 2004 |
| Joseph's Jewellers Limited | Other services | 2002 |
| JPH Ltd | Professional & scientific | 1999 |
| JR Services Limited | Administrative & support | 2002 |
| JSD Engineering & Construction Limited | Professional & scientific | 2005 |
| Jse-Uk Ltd | Manufacturing | 2001 |