| I and M Medical Limited | Health & social care | 2015 |
| I and N Signs Ltd | Professional & scientific | 2018 |
| I and R Sales Limited | Other services | 2011 |
| I D Electrical Solutions Limited | Construction | 2018 |
| I D Signs Ltd | Manufacturing | 2023 |
| I DO Data Limited | Information & communication | 2014 |
| I Holland Holdings Limited | Extraterritorial | 2015 |
| I Holland Limited | Manufacturing | 1998 |
| I K S Holding Ltd | Real estate | 2025 |
| I Like That Limited | Information & communication | 2022 |
| I M Birmingham (162) Limited | Manufacturing | 1983 |
| I M Civil Service Limited | Construction | 2025 |
| I Monetise Ltd | Professional & scientific | 2024 |
| I P S (Electrical Contractor) Limited | Construction | 2007 |
| I R Construction Limited | Construction | 2005 |
| I S Build Limited | Construction | 2014 |
| I S S Healthcare Limited | Health & social care | 2006 |
| I TRE Nonni Ltd | Hospitality | 2013 |
| I W O Limited | Health & social care | 2002 |
| I&E Enterprise Ltd | Construction | 2024 |
| I&G Project Consultancy Ltd | Professional & scientific | 2022 |
| I&I Commercial Ltd | Real estate | 2026 |
| I&I Estates Ltd | Real estate | 2025 |
| I&L Robinson Rentals LLP | | 2025 |
| I&M Impact Holdings Limited | Financial services | 2025 |
| I-Drive Driving School Limited | Education | 2011 |
| I-Lumen Limited | Wholesale & retail | 2025 |
| I-Syne Limited | Professional & scientific | 2025 |
| I-Wood Joinery & Carpentry Limited | Construction | 2022 |
| I. & a. Burgoyne Trading Limited | Construction | 1992 |
| I.D. & S. Dunbar Limited | Extraterritorial | 2002 |
| I.H. Moore and Company (Holdings) Limited | Financial services | 1976 |
| I.R.H.S Ltd | Other services | 2024 |
| I.S.S. Windows Limited | Construction | 2005 |
| I2000 Limited | Professional & scientific | 2013 |
| I4C Investments Ltd | Real estate | 2019 |
| I5 Retail Holdings Limited | Wholesale & retail | 2020 |
| IA Holdings Limited | Real estate | 2004 |
| IAC Joinery Ltd | Construction | 2025 |
| Iadietetics Ltd | Health & social care | 2026 |
| IAF Medical Ltd | Health & social care | 2014 |
| IAF Pharma Ltd | Wholesale & retail | 2025 |
| IAG Distribution Consultants Limited | Administrative & support | 2012 |
| Iain a Daly Services Ltd | Construction | 2026 |
| Iain James Furniture Limited | Manufacturing | 1991 |
| Iain Mcfadyen Business Limited | Wholesale & retail | 2014 |
| Iain Oliver Productions Ltd | Administrative & support | 2019 |
| IAM Property Services Ltd | Real estate | 2022 |
| Iamphd Limited | Hospitality | 2018 |
| IAN and Jennifer Blair & Co Limited | Professional & scientific | 2002 |
| IAN Butters Ltd | Real estate | 2019 |
| IAN Clarke (Medbourne) Limited | Manufacturing | 2013 |
| IAN Coyle Enterprises Limited | Other services | 2024 |
| IAN Curryer Consulting Ltd | Professional & scientific | 2020 |
| IAN Edward Watkins Limited | Construction | 2025 |
| IAN Hart Consultancy Limited | Education | 2011 |
| IAN Kirk Fibreglassing Ltd | Construction | 2021 |
| IAN Langley Limited | Other services | 2014 |
| IAN Markwick Driver Training Limited | Transport & logistics | 2008 |
| IAN O'Brien Music Limited | Education | 2021 |
| IAN Paling Limited | Wholesale & retail | 2002 |
| IAN Stevens Limited | Financial services | 2015 |
| IAS GAS Plumbing & Heating Ltd | Construction | 2026 |
| Iasmi 21 Ltd | Transport & logistics | 2022 |
| IAW Group Ltd | Administrative & support | 2024 |
| IBA Distributions Ltd | Wholesale & retail | 2026 |
| IBA Planning Limited | Professional & scientific | 2014 |
| Ibash Trading Ltd | Wholesale & retail | 2025 |
| Ibbysourcedit Ltd | Wholesale & retail | 2025 |
| IBC Transport Ltd | Transport & logistics | 2024 |
| Ibcs (UK) Limited | Construction | 2007 |
| Ibis Systems Ltd | Information & communication | 2012 |
| Ibld Limited | Construction | 2023 |
| Ibmg Property Works Ltd | Construction | 2021 |
| IBN Ltd | Hospitality | 2015 |
| IBO Same Day Ltd | Transport & logistics | 2025 |
| IBP Limited | Real estate | 2025 |
| Ibpm Consultancy Ltd | Professional & scientific | 2025 |
| Ibrahim 89 Ltd | Hospitality | 2019 |
| Ibrahim Top Ltd | Wholesale & retail | 2025 |
| Ibran Limited | Wholesale & retail | 2014 |
| Ibrg Holding Corporation Limited | Information & communication | 2025 |
| Ibrows Microblading & PMU Limited | Other services | 2020 |
| IC Ashworth Ltd | Administrative & support | 2022 |
| IC Autos Ltd | Administrative & support | 2011 |
| IC Elliott Ltd | Administrative & support | 2022 |
| IC IT Solutions Limited | Extraterritorial | 2012 |
| IC Solutions Consultancy Ltd | Professional & scientific | 2025 |
| Icare Nottingham Ltd | Health & social care | 2016 |
| Icca Enterprises C.I.C. | Other services | 2015 |
| Ice Accountants Limited | Professional & scientific | 2025 |
| Ice Care Ltd | Health & social care | 2018 |
| Ice Nine (Nottingham) Limited | Wholesale & retail | 2024 |
| Ice Professional Services Limited | Professional & scientific | 2005 |
| Ice Property and Lettings Ltd | Hospitality | 2020 |
| Ice Surgeries Limited | Health & social care | 2009 |
| Ice White Limited | Administrative & support | 2003 |
| Iceberg Estates Limited | Real estate | 2022 |
| Iced Fire OFF Licence Limited | Wholesale & retail | 2025 |
| Icelant Beauty Ltd | Wholesale & retail | 2024 |