| I1984RECORD Limited | Wholesale & retail | 2024 |
| I2E Limited | Administrative & support | 2021 |
| I3 Mobile Shop Ltd | Wholesale & retail | 2025 |
| I3-GROUP Limited | Professional & scientific | 2011 |
| I4 Finance Limited | Financial services | 2021 |
| I8SL Ltd | Information & communication | 2023 |
| Iafeya Group Limited | Financial services | 2022 |
| Iafeya Limited | Information & communication | 2019 |
| IAH Property Ltd | Real estate | 2020 |
| Iain Charles Hair Design Ltd | Other services | 2015 |
| IAK Goods Ltd | Wholesale & retail | 2021 |
| IAM Consulting Engineers Limited | Administrative & support | 2016 |
| Iamz Ltd | Hospitality | 2025 |
| IAN Beamish Ltd | Other services | 2025 |
| IAN Crowe Health and Safety Consultants Ltd | Professional & scientific | 2011 |
| IAN Gartside Mortgage Services Limited | Financial services | 2026 |
| IAN J Bates Limited | Professional & scientific | 2014 |
| IAN James Surveying Professionals Limited | Professional & scientific | 2008 |
| IAN Lock Building Contractors Limited | Construction | 2007 |
| IAN Mercer (Property Holdings) Ltd | Construction | 1997 |
| IAN Mock Properties Ltd | Real estate | 2023 |
| IAN Moglione Audio Visual Services Limited | Professional & scientific | 2005 |
| IAN Owen Communications Ltd | Information & communication | 2017 |
| IAN Potter Plumbing & Heating Limited | Construction | 2015 |
| IAN Pritchard Properties Limited | Real estate | 2017 |
| IAN Reed Limited | Health & social care | 2010 |
| IAN Ross Limited | Administrative & support | 2016 |
| IAN Scott Hairdressing Limited | Other services | 1998 |
| IAN Strachan Ltd | Construction | 2007 |
| IAN Wreglesworth Associates Limited | Professional & scientific | 2011 |
| Ianbankslogistics Ltd | Administrative & support | 2025 |
| Ianco Ltd | Professional & scientific | 2015 |
| Ianp Motor Services Ltd | Wholesale & retail | 2012 |
| IAO Tech Limited | Financial services | 2024 |
| Ib&Fc (LPL) Limited | Financial services | 2023 |
| IBB Urban Living Ltd | Households | 2025 |
| Ibbotson Properties Ltd | Real estate | 2019 |
| Ibby & Adam’S Ltd | Hospitality | 2025 |
| IBE Productions Limited | Information & communication | 2024 |
| Ibeauty Brands UK Ltd | Wholesale & retail | 2019 |
| Ibeb Ltd | Arts & recreation | 2025 |
| Ibhcouriers Ltd | Transport & logistics | 2026 |
| IBI Adam Deen Ltd | Wholesale & retail | 2024 |
| Ibiyinka Art Studio Ltd | Arts & recreation | 2026 |
| IBN Awida Ltd | Hospitality | 2025 |
| IBO Girl Productions Limited | Administrative & support | 2025 |
| Ibom International Ltd | Education | 2025 |
| Ibowers Ltd | Transport & logistics | 2025 |
| Ibsen Labs Ltd | Information & communication | 2026 |
| Ibsm Toures Limited | Administrative & support | 2019 |
| Ibuild Developments North West Ltd | Construction | 2022 |
| Ibukun Enterprises Ltd | Health & social care | 2019 |
| IC Associates Limited | Extraterritorial | 2011 |
| IC NW Limited | Construction | 2025 |
| IC Scaffold Solutions Ltd | Construction | 2026 |
| Icabs Travel GB Limited | Transport & logistics | 2026 |
| Ican Personal Training (Wilmslow) Limited | Education | 2012 |
| Ican Physiotherapy Limited | Health & social care | 2013 |
| Icapitalize Academy Ltd | Education | 2026 |
| Icapitalize Social Ltd | Professional & scientific | 2026 |
| Icarus Medical Ltd | Education | 2019 |
| Icarus Security Management Ltd | Administrative & support | 2025 |
| Icarus Security Solutions Limited | Administrative & support | 2024 |
| Icax Limited | Construction | 1999 |
| ICB Comms Limited | Construction | 2023 |
| Iccommodate Limited | Real estate | 2010 |
| Icdevelopers Limited | Real estate | 2024 |
| Ice Blasting Solutions Limited | Administrative & support | 2013 |
| Ice Cats Global Initiative Ltd | Education | 2020 |
| Ice Cats Training Ltd | Administrative & support | 2017 |
| Ice Kitchen Ltd | Manufacturing | 2014 |
| Ice Logistics Lpool Limited | Transport & logistics | 2026 |
| Ice Property Management Ltd | Real estate | 2020 |
| Ice-Engineering Ltd | Manufacturing | 2024 |
| Icebase Ltd | Professional & scientific | 2024 |
| Iced Meadowhall Ltd | Hospitality | 2025 |
| Icede Solutions Limited | Information & communication | 2010 |
| Icefire Therapy Ltd | Other services | 2024 |
| Icekool Limited | Construction | 2023 |
| Icella Group Ltd | Financial services | 2025 |
| Iceni Life CIC | Health & social care | 2026 |
| Ices Construction Limited | Construction | 2023 |
| Ichi NI SAN Ltd | Arts & recreation | 2025 |
| Ichigo Luxe Ltd | Wholesale & retail | 2025 |
| Ichor Bloom Ltd | Manufacturing | 2018 |
| ICI Invest Ltd | Financial services | 2024 |
| Iclinician Ltd | Information & communication | 2011 |
| ICM Construction Management Ltd | Construction | 2014 |
| ICO Didsbury Point Estate Management Limited | Real estate | 2007 |
| ICO Energy Limited | Professional & scientific | 2003 |
| Icollect Ltd | Wholesale & retail | 2022 |
| Icon Guards Ltd | Administrative & support | 2021 |
| Icon Pro Creatives Limited | Other services | 2008 |
| Icon Technology Systems Limited | Manufacturing | 2009 |
| Icon Technology Systems Trading Limited | Manufacturing | 2015 |
| Icon UK Alliance Limited | Extraterritorial | 2015 |
| Icon Ultralift Direct Ltd | Administrative & support | 2013 |
| Icon Ultralift Skincare Limited | Other services | 2024 |
| Icon-Sultantc Ltd | Professional & scientific | 2024 |
| Iconattireuk Ltd | Wholesale & retail | 2026 |