| Ideal Corporate Solutions (EOT) Limited | Financial services | 2024 |
| Ideal Corporate Solutions Limited | Professional & scientific | 2004 |
| Ideal Home & Food Hall Limited | Wholesale & retail | 2025 |
| Ideal Homes Estate Limited | Real estate | 2017 |
| Ideal Investments Limited | Real estate | 2021 |
| Ideal Motors Group UK Ltd | Wholesale & retail | 2026 |
| Ideal Residential Ltd | Real estate | 2022 |
| Ideal Trade 365 Limited | Administrative & support | 2019 |
| Idealconsultantsmcr Ltd | Education | 2024 |
| Idealliving Limited | Education | 2026 |
| Ideals UK Packaging (Bespoke) Ltd | Manufacturing | 2022 |
| Ideals UK Packaging Ltd | Manufacturing | 2017 |
| Ideas Coach Online Ltd | Professional & scientific | 2005 |
| Ideaspro Consultants Ltd | Professional & scientific | 2016 |
| IDF Consult Ltd | Professional & scientific | 2026 |
| Idig Ltd. | Construction | 2012 |
| IDN Store Ltd | Wholesale & retail | 2025 |
| IDN Supplies AV Limited | Extraterritorial | 2009 |
| IDN Supplies Limited | Extraterritorial | 2009 |
| Idns AV Limited | Extraterritorial | 2009 |
| Idns Holdings Limited | Information & communication | 2018 |
| IDO Beauty Ltd | Wholesale & retail | 2009 |
| Idoma Union United Kingdom (Iduuk) C.I.C. | Education | 2025 |
| Idris & Co (Bolton) Limited | Hospitality | 1998 |
| Idua Consultancy Limited | Professional & scientific | 2016 |
| Idyllic Destinations Ltd | Administrative & support | 2014 |
| IE Properties Ltd | Real estate | 2019 |
| IF Services NW Ltd | Extraterritorial | 2019 |
| IF Traders PK Ltd | Wholesale & retail | 2023 |
| Ifal Properties Limited | Real estate | 2023 |
| Ifayh Trading Ltd | Wholesale & retail | 2023 |
| Ifemi Ltd | Administrative & support | 2020 |
| Ifka Ltd | Transport & logistics | 2022 |
| Ifracture Ltd | Wholesale & retail | 2024 |
| Ifsl Platform Service Providers Ltd | Extraterritorial | 2017 |
| Ifsl Platform Services Limited | Financial services | 2017 |
| Ifsl Professional Services Limited | Financial services | 2015 |
| IGC Technical Solutions Ltd | Information & communication | 2007 |
| Ignite Express Ltd | Transport & logistics | 2024 |
| Ignite GAS Group Ltd | Construction | 2025 |
| Ignitech Limited | Information & communication | 2021 |
| IH Health Ltd | Health & social care | 2023 |
| IHA Medical Ltd | Real estate | 2019 |
| IHB Limited | Construction | 2011 |
| Iheat Holdings Ltd | Financial services | 2025 |
| Iheating Solutions Limited | Other services | 2019 |
| IHH AV Limited | Transport & logistics | 2023 |
| Ihire Bolton Limited | Transport & logistics | 2019 |
| Ihomj Ltd | Wholesale & retail | 2025 |
| II Consultancy Ltd | Professional & scientific | 2025 |
| IIA Properties Limited | Real estate | 2025 |
| Iignite Ltd | Water & waste | 2013 |
| IIK Couriers Ltd | Transport & logistics | 2025 |
| Iinfou Digital Ltd | Professional & scientific | 2019 |
| Iinfou Ltd | Administrative & support | 2015 |
| IJK Service and Repair Ltd | Professional & scientific | 2026 |
| Ijss Investments Ltd | Real estate | 2021 |
| IK Cadcam Ltd | Manufacturing | 2024 |
| IK Healthcare Ltd | Extraterritorial | 2023 |
| IK Master Build Ltd | Construction | 2013 |
| IK Tech Consultancy Ltd | Information & communication | 2026 |
| IK Trading Bolton Ltd | Wholesale & retail | 2019 |
| IK1 Ltd | Wholesale & retail | 2024 |
| IKA Medical Services Ltd | Health & social care | 2026 |
| Ikara Business Solutions Limited | Administrative & support | 2010 |
| Ikaris Ltd | Wholesale & retail | 2022 |
| IKG Consulting Limited | Administrative & support | 2010 |
| Ikheriya I Limited | Wholesale & retail | 2025 |
| Ikigai Life Sciences Limited | Professional & scientific | 2020 |
| Ikigaico Ltd | Information & communication | 2024 |
| Iknm Ltd | Wholesale & retail | 2025 |
| IKZ Accountants Ltd | Professional & scientific | 2023 |
| IL Sapore Italian Ltd | Hospitality | 2020 |
| Ilan Electronics Ltd | Manufacturing | 2021 |
| Ileri Labs Ltd | Professional & scientific | 2025 |
| ILH Limited | Education | 2022 |
| Ilhaam UK Limited | Wholesale & retail | 2024 |
| Ilkoni Ltd | Administrative & support | 2022 |
| Illuminated Cats Community Interest Company | Education | 2023 |
| Illusions Health & Beauty Ltd | Other services | 2011 |
| Illy Trade Ltd | Administrative & support | 2022 |
| ILM Laboratory Ltd | Wholesale & retail | 2023 |
| ILS Driving School Ltd | Education | 2026 |
| Iluminar Security Solutions Ltd | Administrative & support | 2020 |
| IM (85) Holdings Ltd | Financial services | 2026 |
| IM (NW) Holdings Ltd | Real estate | 2023 |
| IM Logistics Ltd | Transport & logistics | 2019 |
| IM8 UK Holdings Limited | Health & social care | 2014 |
| Imad Builders Ltd | Construction | 2025 |
| Images by Sally Limited | Other services | 2015 |
| Iman Renewable Energy Ltd | Construction | 2021 |
| Iman Trading Limited | Wholesale & retail | 2020 |
| Imari Limited | Wholesale & retail | 2025 |
| Imelldanie Limited | Information & communication | 2025 |
| Imfixed Global Ltd | Wholesale & retail | 2026 |
| Imfixed Holdings Ltd | Wholesale & retail | 2026 |
| Imfixed Ltd | Wholesale & retail | 2022 |
| Imfs Properties Ltd | Real estate | 2023 |
| IMI Body Tech Specialist Limited | Wholesale & retail | 2014 |
| IMK Autos (UK) Ltd | Transport & logistics | 2025 |