| I.A.S.P. LLP | | 2011 |
| I.C.S. Distribution Limited | Manufacturing | 2002 |
| I.D Mouldings Ltd | Manufacturing | 2019 |
| I.D.C. Systems Limited | Information & communication | 1988 |
| I.D.D. Limited | Professional & scientific | 1997 |
| I.E.A Worldwide Furniture UK Ltd | Wholesale & retail | 2025 |
| I.E.Takeaway Limited | Hospitality | 2019 |
| I.F Investment Ltd | Real estate | 2022 |
| I.G.P.I. Services Ltd | Extraterritorial | 2020 |
| I.H.S Solutions Ltd | Health & social care | 2026 |
| I.J. Technologies (U.K) Ltd | Information & communication | 2024 |
| I.K Deliveries Ltd | Transport & logistics | 2026 |
| I.K Fitness Limited | Manufacturing | 2020 |
| I.K. Distribution Ltd | Transport & logistics | 2008 |
| I.M. Leach Fish and Poultry Limited | Wholesale & retail | 2005 |
| I.M.D.H Properties Limited | Real estate | 2020 |
| I.N 247 Electrician Ltd | Construction | 2026 |
| I.N.A. Homes Ltd | Construction | 2015 |
| I.N.Edwards Properties Limited | Real estate | 2025 |
| I.One Photography Limited | Professional & scientific | 2015 |
| I.Q 29 Limited | Real estate | 2025 |
| I.S Automotive Ltd | Professional & scientific | 2023 |
| I.S. Services Limited | Administrative & support | 2018 |
| I.S.A Distributions Ltd | Wholesale & retail | 2026 |
| I.S.A. Homes Ltd | Real estate | 2024 |
| I.S.L. Waste Care Ltd | Water & waste | 2008 |
| I.T Solutions A2Z Ltd | Wholesale & retail | 2023 |
| I.T's Kaka Ltd | Professional & scientific | 2023 |
| I.T. Architecture Solutions Ltd. | Information & communication | 2011 |
| I.Z Global Catering Equipment Ltd | Wholesale & retail | 2024 |
| I2BS Project CIC | Administrative & support | 2025 |
| I2D Infoservices Limited | Information & communication | 2017 |
| I2J Ltd | Real estate | 2023 |
| I2SOFT Limited | Information & communication | 2020 |
| I365 Global Ltd | Wholesale & retail | 2025 |
| I3I Tech Ltd | Construction | 2021 |
| I4B Capex Limited | Professional & scientific | 2021 |
| I4I Ltd | Wholesale & retail | 2024 |
| I5 2019 Ltd | Other services | 2015 |
| I5 Risk Global Advisory Limited | Other services | 2024 |
| I5 Risk Limited | Professional & scientific | 2013 |
| I5 Risk UK Holdings Limited | Financial services | 2024 |
| I5 Sports Management Ltd | Professional & scientific | 2013 |
| I60 Community Interest Company | Education | 2022 |
| I@A Transport Ltd | Transport & logistics | 2026 |
| IA Advisory Ltd | Professional & scientific | 2017 |
| IA Capital Partners Ltd | Professional & scientific | 2026 |
| IA Carz Ltd | Administrative & support | 2022 |
| IA Driver Ltd | Transport & logistics | 2025 |
| IA Estates Ltd | Real estate | 2025 |
| IA Fuels Ltd | Wholesale & retail | 2023 |
| IA Global Manpower Ltd | Wholesale & retail | 2020 |
| IA Heating & Plumbing Ltd | Construction | 2024 |
| IA Holdco Ltd | Financial services | 2026 |
| IA Property Developments Ltd | Real estate | 2023 |
| IA Risk Ltd | Administrative & support | 2023 |
| IAA Limited | Administrative & support | 2025 |
| Iaaa Properties Ltd | Real estate | 2025 |
| Iaacc Ltd | Professional & scientific | 2020 |
| Iac-Uk | Health & social care | 2019 |
| Iacademy Education Ltd | Education | 2024 |
| Iacademy Ltd | Education | 2020 |
| Iaff Films Limited | Information & communication | 2023 |
| IAH Energy Limited | Professional & scientific | 2025 |
| IAH Pharm Ltd | Wholesale & retail | 2022 |
| IAH Trading Ltd | Wholesale & retail | 2020 |
| Iaip Limited | Real estate | 2023 |
| IAK Logistics Limited | Transport & logistics | 2025 |
| IAL Trading Ltd | Wholesale & retail | 2023 |
| Ialocums (WM) Ltd | Health & social care | 2018 |
| IAM Networks Ltd | Information & communication | 2025 |
| Iamcom Limited | Health & social care | 2024 |
| Iamdefiance Limited | Arts & recreation | 2026 |
| Iamdjmike Entertainment Ltd | Arts & recreation | 2025 |
| Iamnabil Ltd | Information & communication | 2022 |
| IAN a Smith Limited | Arts & recreation | 2004 |
| IAN Asprey Decorating Services Ltd | Construction | 2010 |
| IAN Crow Multimedia Ltd | Information & communication | 2014 |
| IAN D Hall Associates Limited | Professional & scientific | 2010 |
| IAN Developments Limited | Construction | 2017 |
| IAN Holdings Limited | Professional & scientific | 2018 |
| IAN Partlett Ltd | Construction | 2011 |
| IAN R Metcalfe & Associates Limited | Professional & scientific | 2014 |
| IAN Skett Funeral Services Ltd | Other services | 2017 |
| Ianos Transport Ltd | Wholesale & retail | 2016 |
| IAP Consulting Limited | Information & communication | 2014 |
| IAS Lawyers Consultancy Ltd | Professional & scientific | 2015 |
| Iaudit Consultants Limited | Administrative & support | 2012 |
| Iautomotive Solutions Limited | Wholesale & retail | 2014 |
| Iawan Express Limited | Transport & logistics | 2017 |
| IAZ Courier Limited | Transport & logistics | 2026 |
| IAZ Properties Ltd | Real estate | 2025 |
| IB Autocentre Ltd | Wholesale & retail | 2025 |
| IB Cars and Parts Ltd | Wholesale & retail | 2023 |
| IB Cladding Services Ltd | Construction | 2022 |
| IB Construction Bham Ltd | Construction | 2025 |
| IB Engineering Ltd | Professional & scientific | 2013 |
| IB Eyecare Ltd | Health & social care | 2026 |
| IB Housing Limited | Real estate | 2025 |
| IB Hypers Ltd | Wholesale & retail | 2025 |