| Intatec Limited | Wholesale & retail | 2002 |
| Intecso Ltd | Wholesale & retail | 2020 |
| Integra (E-Quip) Limited | Information & communication | 2017 |
| Integra Security Limited | Administrative & support | 2000 |
| Integrated Fit OUT Limited | Construction | 2019 |
| Intelligence Quotient Services Limited | Other services | 2018 |
| Intelligent Financial and Management Services Ltd | Financial services | 2021 |
| Intellr Studio Limited | Information & communication | 2026 |
| Intense Adventure Limited | Education | 2017 |
| Interactive Web Solutions Limited | Information & communication | 2000 |
| Intercool Systems Limited | Manufacturing | 1998 |
| Intergalactic Galaxy Co., Ltd | Wholesale & retail | 2022 |
| International Canine Behaviourists Limited | Administrative & support | 2016 |
| International Growth Park Ltd | Wholesale & retail | 2025 |
| International Knowledge Publishers Limited | Information & communication | 2022 |
| International Union for Stenography and Typewriting Limited | Information & communication | 2024 |
| Interpro Workstations Ltd | Manufacturing | 2010 |
| Intersect Group Limited | Wholesale & retail | 2025 |
| Intown Estates Ltd | Real estate | 2024 |
| Intown Interiors Limited | Wholesale & retail | 2011 |
| Intpro Holdings Limited | Financial services | 2022 |
| Intpro Limited | Information & communication | 2014 |
| Intrepidus Outdoors Ltd | Administrative & support | 2018 |
| Intuitive Finance and Management Consultancy Ltd | Information & communication | 2013 |
| Invest Board Limited | Real estate | 2025 |
| Invictus Consulting Ltd | Administrative & support | 2025 |
| Invisible Children Ltd | Transport & logistics | 2025 |
| Inward Therapies Limited | Health & social care | 2026 |
| Inwaste Hixon Ltd | Water & waste | 2024 |
| Ionex Water Solutions Ltd | Construction | 2024 |
| Ionic Power Limited | Manufacturing | 2000 |
| IP4 Limited | Real estate | 2018 |
| IPW Holdings Limited | Real estate | 2018 |
| IRB Sport Consultancy Limited | Arts & recreation | 2018 |
| Irving Agronomy Limited | Agriculture & fishing | 2025 |
| ISB Express Ltd | Transport & logistics | 2019 |
| ISE Business Park Limited | Construction | 2013 |
| ISE Management Limited | Extraterritorial | 2013 |
| ISE Trading Limited | Extraterritorial | 2011 |
| Isec Interior Systems Ltd | Construction | 1992 |
| ISJ Properties & Developments Limited | Real estate | 2020 |
| Islay Photography Limited | Arts & recreation | 2016 |
| ISM Property Investments Limited | Real estate | 2018 |
| Israel Lifress Bio-Tech Co., Ltd | Mining & quarrying | 2025 |
| Israel Wychida Plant Nutrition Co., Ltd. | Wholesale & retail | 2025 |
| Istarska Avantura Limited | Transport & logistics | 2014 |
| Itech Eccleshall Limited | Wholesale & retail | 2014 |
| Iter Media Ltd | Information & communication | 2024 |
| Itsnotplastic Ltd | Wholesale & retail | 2020 |
| Ivon Property Management Ltd | Real estate | 2006 |
| IVY Beauty Lounge Ltd | Other services | 2023 |
| IVY Cottage Mobile Home Park LLP | | 2024 |
| Iwear Fashion (UK) Company Limited | Extraterritorial | 2013 |
| Iweb (Stafford) Limited | Information & communication | 2017 |
| Iweb Holdings Limited | Financial services | 2024 |
| Izero Technologies Ltd | Information & communication | 2020 |
| J & a Lawns Limited | Other services | 2024 |
| J & D Alexander Limited | Real estate | 2026 |
| J & E Holdings Limited | Financial services | 2015 |
| J & E Utility Services Limited | Construction | 2020 |
| J & J Davies Limited | Hospitality | 2004 |
| J & M Farming Limited | Agriculture & fishing | 2026 |
| J & M Mechanical Services Limited | Construction | 2004 |
| J Allen Engineering Ltd | Manufacturing | 2017 |
| J and J Home Fuels Ltd | Wholesale & retail | 2023 |
| J B Installations Stafford Ltd | Construction | 2021 |
| J Custom Corner Limited | Wholesale & retail | 2024 |
| J D Future Ltd | Financial services | 2022 |
| J D O'Gorman Limited | Wholesale & retail | 2016 |
| J D PUB Group Ltd | Financial services | 2022 |
| J D Smith Landscapes Limited | Administrative & support | 2012 |
| J Dennis & K Dennis R D Roofing LLP | | 2005 |
| J F T Training Ltd | Administrative & support | 2024 |
| J F Timber Ltd | Wholesale & retail | 2019 |
| J G ENG Services Limited | Manufacturing | 2014 |
| J Holt & SON LLP | | 2024 |
| J J Pharma Ltd | Extraterritorial | 2022 |
| J K Fleet Services Limited | Wholesale & retail | 2021 |
| J L Peake Limited | Other services | 2015 |
| J M Hypnotherapy Ltd | Health & social care | 2018 |
| J M Parkgate Cannock Wood Ltd | Hospitality | 2023 |
| J M S Erection Ltd | Administrative & support | 2003 |
| J N R Contractors Limited | Construction | 2009 |
| J P M Utilities Limited | Construction | 2010 |
| J P Plumbing Stafford Ltd | Construction | 2023 |
| J Palmer Consultancy Limited | Professional & scientific | 2011 |
| J S Nicholls Building Solutions Ltd | Construction | 2007 |
| J S. COM Limited | Information & communication | 1997 |
| J Tierney Ltd | Financial services | 2016 |
| J W Refrigeration Services Ltd | Manufacturing | 2011 |
| J W Wylie Ltd | Information & communication | 2025 |
| J&J Nails Stafford Ltd | Other services | 2022 |
| J&N Partners Limited | Construction | 2009 |
| J&P Automotive Limited | Wholesale & retail | 2026 |
| J&P Main Limited | Other services | 2008 |
| J&S Industry Co., Limited | Manufacturing | 2023 |
| J&S Property Acquisitions Limited | Real estate | 2021 |
| J. & K. Investments Limited | Real estate | 1973 |
| J. Clee Trading Ltd | Construction | 2026 |
| J. F. Sandy (Milford) Limited | Hospitality | 2006 |