| IAE Investments Ltd | Real estate | 2023 |
| Iarr Ltd | Wholesale & retail | 2023 |
| Ibex Associates International Ltd | Professional & scientific | 2023 |
| IBN UL Bar Ltd | Wholesale & retail | 2026 |
| IBS Managed Account Ltd | Health & social care | 2012 |
| Ibukun Elujoba Care* Ltd | Health & social care | 2024 |
| IBZ Trade Limited | Wholesale & retail | 2026 |
| Icarus Capital Ltd | Real estate | 2021 |
| Ice City Desserts 1 Ltd | Hospitality | 2025 |
| ICO Integrated Solutions Ltd | Construction | 2024 |
| Icon Building & Renovation Ltd | Construction | 2021 |
| Icon Clothing Manchester Limited | Wholesale & retail | 2009 |
| Icon FIX Electrical Ltd | Manufacturing | 2022 |
| Icon Sports Group UK Ltd | Wholesale & retail | 2019 |
| Icon Sports North West Ltd | Wholesale & retail | 2019 |
| Icon Sports UK Limited | Wholesale & retail | 2015 |
| Iconnectproperties Ltd | Real estate | 2024 |
| Icourierm Limited | Transport & logistics | 2025 |
| ID Studio Services Ltd | Manufacturing | 2023 |
| Idea Assessor Limited | Professional & scientific | 2025 |
| Ideal Solutions Management Ltd | Professional & scientific | 2018 |
| Idrion Estates Ltd | Real estate | 2026 |
| IEO Ltd | Financial services | 2022 |
| IFI Holdings Ltd | Wholesale & retail | 2021 |
| Ifizzz Limited | Information & communication | 2025 |
| Ifytin Security Limited | Administrative & support | 2023 |
| Iggyworx Ltd | Manufacturing | 2026 |
| IGM Professional Consulting Ltd | Health & social care | 2021 |
| Ignition Risk Management Ltd | Professional & scientific | 1997 |
| Igreja Missionaria Assembleia DE Deus CIC | Other services | 2026 |
| IH Project UK Ltd | Wholesale & retail | 2025 |
| IHB Groundworks Ltd | Other services | 2025 |
| IIG Properties Ltd | Real estate | 2020 |
| Iish Care Group Ltd | Health & social care | 2025 |
| IJ Trading and Consultancy Ltd | Wholesale & retail | 2026 |
| IJS Engineering Solutions Ltd | Wholesale & retail | 2022 |
| IK International Private Ltd | Wholesale & retail | 2021 |
| IKA Ophthalmic Ltd | Real estate | 2015 |
| Ikahmad Limited | Professional & scientific | 2021 |
| Ilam Properties Limited | Real estate | 2019 |
| Ilbp Appointeeships Ltd | Health & social care | 2025 |
| Ilbp Deputies Ltd | Health & social care | 2025 |
| Ilbp Limited | Health & social care | 2012 |
| Ilbp Provider Ltd | Health & social care | 2020 |
| Ilbp Support Ltd | Health & social care | 2012 |
| Ilearn Digital Ltd | Education | 2019 |
| Ilearn International Limited | Education | 2016 |
| ILM Software Limited | Information & communication | 2005 |
| Ilyas Trading Ltd | Wholesale & retail | 2023 |
| Im-Mills Ltd | Health & social care | 2012 |
| IMA Capital Limited | Real estate | 2016 |
| Imar Ltd | Real estate | 2020 |
| Imexel Ltd | Wholesale & retail | 2025 |
| Impact Construction Ltd | Construction | 2022 |
| Impact Gym (Manchester) Ltd | Arts & recreation | 2018 |
| Impact Hub CIC | Health & social care | 2025 |
| Imperial Arabian Ltd | Wholesale & retail | 2026 |
| Imperial Bedding Limited | Wholesale & retail | 2019 |
| Imperial IT Consultancy Limited | Information & communication | 2022 |
| Imperial Oak Estates Ltd | Real estate | 2025 |
| Imperial Property Developers Ltd | Construction | 2017 |
| Imperio Autos Ltd | Wholesale & retail | 2024 |
| Imperiolatinorecord Ltd | Information & communication | 2025 |
| Impressivestyle Limited | Professional & scientific | 2000 |
| Imran Altaf Ltd | Information & communication | 2019 |
| Imran Solutions Ltd | Health & social care | 2008 |
| IMU Osem Ltd | Health & social care | 2025 |
| IN Stream Partnership Limited | Health & social care | 2003 |
| IN Time Builders Ltd | Construction | 2025 |
| IN2LEARN Limited | Other services | 2011 |
| Inaaya Realty Ltd | Real estate | 2025 |
| Inaaya Solutions Ltd | Professional & scientific | 2015 |
| Incontel Limited | Wholesale & retail | 2021 |
| Incredible Edibles CBD Ltd | Extraterritorial | 2020 |
| Independent Fire Safety Services Limited | Professional & scientific | 2015 |
| Independent Medical Services (Nationwide) Limited | Health & social care | 2010 |
| Indi DA Cruz Cleaning Services Ltd | Administrative & support | 2025 |
| Indian Palace Takeaway Limited | Hospitality | 2015 |
| Indigo Blue Clinical Assessments Limited | Health & social care | 2025 |
| Indigo Soul Limited | Wholesale & retail | 2018 |
| Indoor Karting Services Rochdale Ltd | Arts & recreation | 2019 |
| Indus Print Ltd | Manufacturing | 2011 |
| Indusvent (Group) Limited | Financial services | 2023 |
| Indusvent Limited | Manufacturing | 1973 |
| Infill Energy Ltd | Construction | 2024 |
| Infinitas Web Solutions Limited | Information & communication | 2011 |
| Infinite Eyecare Limited | Health & social care | 2024 |
| Infinite Security Solutions UK Limited | Administrative & support | 2009 |
| Infinity Salon Limited | Other services | 2021 |
| Ingleside Accountancy Limited | Professional & scientific | 2024 |
| Inhome Mart Ltd | Wholesale & retail | 2024 |
| Inkd Bacup Ltd | Other services | 2018 |
| Inman Property Services Limited | Real estate | 2018 |
| Inngrain Furniture Limited | Manufacturing | 1999 |
| Innomad Limited | Information & communication | 2023 |
| Innovacre Ltd | Wholesale & retail | 2024 |
| Innovate Baits Limited | Manufacturing | 2011 |
| Innovate NOW Ltd | Administrative & support | 2010 |
| Innovate Traders Limited | Administrative & support | 2024 |
| Innovation East Ltd. | Professional & scientific | 2019 |