| Invicta Move Limited | Transport & logistics | 2024 |
| Invited Limited | Professional & scientific | 2024 |
| Involved Learning Limited | Education | 2012 |
| Inwit Services Limited | Construction | 2007 |
| IP Health Care and Services Ltd | Health & social care | 2023 |
| IPS Roots Ltd | Health & social care | 2023 |
| Ipswich Skills Centre Ltd | Administrative & support | 2019 |
| IQ2 Gold Ltd | Information & communication | 2024 |
| IQ2 Technical Ltd | Information & communication | 2024 |
| Irama Ltd | Real estate | 2025 |
| Irct Ltd | Information & communication | 2018 |
| Irecyc Limited | Construction | 2011 |
| Irfah & Amber Properties Ltd | Real estate | 2024 |
| Iris Property Management Limited | Households | 2025 |
| Ironclad Coatings Limited | Manufacturing | 2026 |
| Irresistible Interiors Design Build & Renovate Limited | Construction | 2020 |
| Irwell Interiors Ltd | Construction | 2026 |
| Irwell Legal Services Limited | Professional & scientific | 2003 |
| Irwell Street Metal Co. Limited | Water & waste | 1975 |
| Irwell View Farm Limited | Agriculture & fishing | 2025 |
| ISA Consultancy Ltd | Health & social care | 2013 |
| Isaac Nadeem Limited | Real estate | 2023 |
| Isah's Ltd | Hospitality | 2019 |
| ISC International Service Company Ltd | Real estate | 2016 |
| Isherwood Construction Services Ltd | Construction | 2018 |
| Isis CRM Limited | Information & communication | 2020 |
| Isla Ltd | Real estate | 2018 |
| Island Telecommunications Limited | Information & communication | 2024 |
| Islo Properties Limited | Real estate | 2022 |
| ISP Hair Ltd | Other services | 2021 |
| Ispyder Limited | Professional & scientific | 2022 |
| Istanbul Barber Bury Limited | Other services | 2023 |
| IT Hardware Hub Ltd | Wholesale & retail | 2020 |
| It's Time Estate Planning Limited | Professional & scientific | 2023 |
| Italia Loftus Property Ltd | Households | 2025 |
| Italia MIA (Radcliffe) Limited | Hospitality | 2010 |
| Italian Dining Ltd | Hospitality | 2011 |
| Itec Solutions (North West) Ltd | Wholesale & retail | 2021 |
| ITK Online Solutions Ltd | Information & communication | 2024 |
| Itom Consultancy Services Ltd | Wholesale & retail | 2016 |
| Itops UK Limited | Information & communication | 2008 |
| ITS in the Trees Ltd | Construction | 2018 |
| Itsadeal Ltd | Wholesale & retail | 2018 |
| Itxi Ltd | Wholesale & retail | 2021 |
| IVD Consulting Ltd | Professional & scientific | 2015 |
| Iversio Ltd | Wholesale & retail | 2024 |
| IVY Greene Estates Limited | Real estate | 2024 |
| Iwoziconcepts Ltd | Transport & logistics | 2023 |
| J & a Building Services Limited | Construction | 2005 |
| J & a Wright Limited | Other services | 2018 |
| J & B Daniel Properties Ltd | Real estate | 2018 |
| J & C Barker (Builders) Limited | Construction | 2002 |
| J & CJ Frozen Foods (Manchester) Limited | Hospitality | 2023 |
| J & D Construction Services Ltd | Construction | 2020 |
| J & E Plumbing & Heating (Bury) Limited | Construction | 2014 |
| J & J Stevens Limited | Professional & scientific | 2009 |
| J & J Workforce Solutions Limited | Administrative & support | 2026 |
| J & K Lees Limited | Hospitality | 2000 |
| J & R Development Services Ltd | Real estate | 2020 |
| J a & J Mason Ltd | Wholesale & retail | 2026 |
| J a Social Care Ltd | Extraterritorial | 2012 |
| J a Stained Glass Limited | Other services | 2021 |
| J C Bailey Services Ltd | Professional & scientific | 2024 |
| J Collect Limited | Administrative & support | 2024 |
| J Cowie FUN Fairs Ltd | Arts & recreation | 2025 |
| J D Sports Limited | Professional & scientific | 1996 |
| J F (NW) Enterprises Ltd | Wholesale & retail | 2026 |
| J Gaffney Tree and Grounds Maintenance Ltd | Administrative & support | 2025 |
| J J & E L Mathew (Waterfold) Limited | Real estate | 2014 |
| J J H Properties Limited | Real estate | 2003 |
| J J L Consultants Ltd. | Administrative & support | 2020 |
| J M Lewis Plumbing & Heating Ltd | Construction | 2014 |
| J P Mcguire Developments Bolton Limited | Construction | 2022 |
| J P Mcguire Developments Limited | Construction | 2013 |
| J P Mcguire Property Ltd | Real estate | 2024 |
| J P Plant Limited | Administrative & support | 2020 |
| J P S Planning Ltd | Professional & scientific | 2016 |
| J P Williams Floor Screeds Ltd | Construction | 2010 |
| J R Amos Electrical Services Limited | Construction | 2014 |
| J S Grygowski Ltd | Transport & logistics | 2024 |
| J S W Agricultural Limited | Administrative & support | 2016 |
| J Smethurst Financial Services Ltd | Financial services | 2021 |
| J Squared Property Holdings Ltd | Real estate | 2025 |
| J Wilson Investments Ltd | Financial services | 2025 |
| J Wilson Ventilation Services Limited | Construction | 2020 |
| J&A Warehouse Limited | Wholesale & retail | 2017 |
| J&P Civil Engineering Limited | Construction | 2019 |
| J&P Commercial Property Services Ltd | Real estate | 2025 |
| J. & J. Tooling Holdings Co. Ltd. | Professional & scientific | 2005 |
| J. Sharp PEP Nominees Limited | Financial services | 1989 |
| J.A.M. Vehicle Solutions Ltd | Wholesale & retail | 2018 |
| J.And D.Jenkinson Limited | Construction | 1972 |
| J.B. Carpets Limited | Wholesale & retail | 1996 |
| J.C.P. (North West) Limited | Construction | 2010 |
| J.M. Daniel Business Services Ltd | Professional & scientific | 2002 |
| J.S.M. Finance Limited | Administrative & support | 1991 |
| J2 Property Solutions Ltd | Real estate | 2025 |
| Jack & Kate Ltd | Professional & scientific | 2026 |
| Jack Bants Ltd | Arts & recreation | 2025 |
| Jack Hamer & SON (Tottington) Limited | Construction | 1960 |