| Islaninvestments Ltd | Real estate | 2025 |
| Ismail & Sons 786 Ltd | Construction | 2024 |
| Ismail Wholesale Limited | Wholesale & retail | 2021 |
| ISO MCR Ltd | Hospitality | 2024 |
| ISO Sushi (Cheadle) Ltd | Hospitality | 2025 |
| ISO Sushi (Chorlton) Ltd | Hospitality | 2025 |
| Isobel Keating Limited | Professional & scientific | 2025 |
| Isoken Jenn Ltd | Health & social care | 2026 |
| Isorae Ltd | Professional & scientific | 2022 |
| Istanbul OLM Limited | Wholesale & retail | 2023 |
| Istiak Holdings Ltd | Financial services | 2025 |
| IT Healthcare Consultancy Ltd | Information & communication | 2020 |
| IT Plumbing & Heating Ltd | Construction | 2011 |
| IT Speditions Ltd | Transport & logistics | 2019 |
| Italian CE Ltd | Hospitality | 2023 |
| Italian Restaurant Group Ltd | Financial services | 2021 |
| Itech Central Ltd | Wholesale & retail | 2018 |
| ITS Nudde Limited | Manufacturing | 2023 |
| Itsochips Ltd | Health & social care | 2018 |
| It’S Over NOW Ltd | Information & communication | 2025 |
| IU Optics Ltd | Health & social care | 2024 |
| Iulian Constantin Cleaning Limited | Construction | 2026 |
| Ivan Slater Window Cleaning Ltd | Administrative & support | 2023 |
| IVY C Ltd | Administrative & support | 2024 |
| IWE Studio Ltd | Manufacturing | 2022 |
| IYA Tech Ltd | Wholesale & retail | 2025 |
| Izekor Ltd | Health & social care | 2020 |
| IZZ BO Limited | Construction | 2008 |
| Izzy's Properties Ltd | Real estate | 2023 |
| J & F Services (Oldham) Ltd | Construction | 2013 |
| J & P Holdings Limited | Real estate | 2017 |
| J & S Storage Limited | Other services | 2020 |
| J & T Management Consultants Limited | Professional & scientific | 2009 |
| J a Roofing Services Ltd | Construction | 2026 |
| J and H Decorators (NW) Ltd | Construction | 2022 |
| J and H Decorators Ltd | Construction | 2022 |
| J Aspin Plastering and Building Contractors Limited | Construction | 2023 |
| J B 4 Tyres Limited | Wholesale & retail | 2016 |
| J Bayman Butchers Limited | Wholesale & retail | 2014 |
| J Berry Cctv Ltd | Administrative & support | 2016 |
| J Bruen Gardening Ltd | Administrative & support | 2024 |
| J Bull Consultants Ltd | Administrative & support | 2012 |
| J C Future Limited | Real estate | 2021 |
| J Connectcare Ltd | Health & social care | 2026 |
| J D Fire & Mechanical Limited | Public administration | 2007 |
| J D Fire (Group) Limited | Professional & scientific | 2009 |
| J D Valves Tube and Fittings Limited | Wholesale & retail | 2019 |
| J Frost Haulage Ltd | Transport & logistics | 2025 |
| J Funding Ltd | Professional & scientific | 2023 |
| J Hamer Pricing Consulting Limited | Professional & scientific | 2026 |
| J Hoque Catering Limited | Hospitality | 2019 |
| J K Bathrooms (NW) Limited | Construction | 2024 |
| J Khan Properties Ltd | Real estate | 2022 |
| J L Design and Project Management Ltd | Professional & scientific | 2015 |
| J L Executive Travels Ltd | Transport & logistics | 2026 |
| J Leonard Electrical Limited | Construction | 2017 |
| J M Bood Ltd | Administrative & support | 2025 |
| J M Hilton Limited | Administrative & support | 2018 |
| J M P Home Improvements Centre Ltd | Construction | 2019 |
| J Mclaughlin Holdings Ltd | Real estate | 2021 |
| J N Building Contractors Ltd | Construction | 2024 |
| J Noon Building Contractors Ltd | Construction | 2019 |
| J P Deli Limited | Hospitality | 2024 |
| J P Landscapes Limited | Administrative & support | 2003 |
| J P Roofing Limited | Construction | 2020 |
| J Periac Communications Ltd | Other services | 2019 |
| J Pybus Joinery Limited | Construction | 2016 |
| J R Lifting Limited | Other services | 2019 |
| J R T Building Contractors Limited | Professional & scientific | 1998 |
| J TRN Holding Ltd | Financial services | 2026 |
| J W Minton & Co Limited | Professional & scientific | 2004 |
| J W Roofline Systems Limited | Construction | 2013 |
| J W Traders Limited | Information & communication | 2006 |
| J Walker Brickwork Limited | Construction | 2002 |
| J Wilson (UK) Limited | Wholesale & retail | 2012 |
| J Wiltshire Holdings Limited | Financial services | 2025 |
| J&A Essentials Limited | Wholesale & retail | 2026 |
| J&B Installation Group Ltd | Professional & scientific | 2021 |
| J&K Digital Media Ltd | Professional & scientific | 2017 |
| J&K Engineering Limited | Professional & scientific | 2019 |
| J&L Roofing & Guttering Ltd | Construction | 2024 |
| J&M Best Ltd | Wholesale & retail | 2024 |
| J&M Properties Oldham Ltd | Real estate | 2022 |
| J&S Haggate Ltd | Hospitality | 2025 |
| J&T Global Limited | Real estate | 2021 |
| J&T Management Consultancy LLP | | 2016 |
| J&W Trading Ltd | Wholesale & retail | 2019 |
| J. Barrett (Haulage) Limited | Transport & logistics | 1975 |
| J. Cavanagh Limited | Manufacturing | 1997 |
| J. Givvons Electrical Limited | Construction | 2001 |
| J. Graham & SON (Oldham) Limited | Construction | 1987 |
| J. Hayes B.S.L. Ltd | Professional & scientific | 2022 |
| J.A.A.D.Events Ltd | Hospitality | 2024 |
| J.A.J Best Choise Limited | Construction | 2024 |
| J.Baron Heating Ltd | Construction | 2023 |
| J.D. Fire Limited | Manufacturing | 2001 |
| J.D.Kenwood & Co.Limited | | 1960 |
| J.I.B. Associates Ltd | Construction | 2014 |
| J.I.P Solutions Ltd | Information & communication | 2016 |
| J.J. Davies Limited | Other services | 1997 |