| Imalian Limited | Construction | 2026 |
| Imamia Mission East London UK Ltd | Health & social care | 2018 |
| Imani Fashion Studio Ltd | Wholesale & retail | 2025 |
| IMB Painting Limited | Construction | 2013 |
| Imha London Limited | Real estate | 2018 |
| IML London Ltd | Wholesale & retail | 2026 |
| IMPACT64.AI Ltd | Information & communication | 2026 |
| Impactstar Financial Services Ltd | Professional & scientific | 2014 |
| Impeccable Electrical Ltd | Manufacturing | 2025 |
| Impeccable Homes Ltd | Construction | 2021 |
| Imperial Accessories Ltd | Wholesale & retail | 2016 |
| Imperial Construction & Development Ltd | Construction | 2022 |
| Imperial Digits UK Limited | Manufacturing | 2025 |
| Imperial Hotel (Dartford) Limited | Hospitality | 2012 |
| Imperial Refrigeration Ltd | Other services | 2011 |
| Imperial Soundbites Ltd | Wholesale & retail | 2019 |
| Imperial Tech Solutions Ltd | Information & communication | 2026 |
| Imperial Valley London Ltd | Hospitality | 2024 |
| Imperial-Plasterworks Ltd | Construction | 2018 |
| Imperium Academy Scholars Ltd | Education | 2025 |
| Imperyal Limited | Wholesale & retail | 2025 |
| Impex Brokers Limited | Wholesale & retail | 2019 |
| Implex Solutions Ltd | Information & communication | 2012 |
| Impressivehomeuk Limited | Real estate | 2018 |
| Imshal Commercial Trading Limited | Wholesale & retail | 2016 |
| Imsol Educational Consultancy Ltd | Education | 2022 |
| IMT Trader Ltd | Construction | 2025 |
| Inaaya Resources Ltd | Wholesale & retail | 2023 |
| Inbox Sell Ltd | Wholesale & retail | 2020 |
| Inclusive Community Wellbeing CIC | Health & social care | 2026 |
| Independent Drama Limited | Administrative & support | 2006 |
| Independent Support & Care Ltd | Health & social care | 2022 |
| Indibu Groups Ltd | Manufacturing | 2026 |
| Indimaj Group Ltd | Administrative & support | 2025 |
| Indispices Ltd | Hospitality | 2023 |
| Indosom Ltd | Wholesale & retail | 2017 |
| Infigo Care Limited | Health & social care | 2022 |
| Infinite Building & Development Limited | Construction | 2024 |
| Infinite Consortium Limited | Health & social care | 2021 |
| Infinite Heights Ltd | Information & communication | 2015 |
| Infinite Loft & Extensions Ltd | Construction | 2023 |
| Infinite Management and Consulting Ltd | Information & communication | 2016 |
| Infiniti Bodyworks Ltd | Wholesale & retail | 2024 |
| Infinity Fire Solution Limited | Public administration | 2022 |
| Infinity Shutters & Shopfront Ltd | Manufacturing | 2025 |
| Info Minds Ltd | Information & communication | 2014 |
| Inforce Construction Limited | Construction | 2019 |
| ING Estates Limited | Real estate | 2011 |
| Ingiltere Turk Dernekleri Federasyonu (Itdf) Limited | Extraterritorial | 2014 |
| Ingleo Brew and Bites Ltd | Wholesale & retail | 2025 |
| Inhouzinteriors Ltd | Professional & scientific | 2019 |
| INK Link London Ltd | Wholesale & retail | 2022 |
| Innova Services Limited | Construction | 2015 |
| Innovaidia Ltd | Other services | 2021 |
| Innovate Safety Ltd | Professional & scientific | 2021 |
| Innovations AI Ltd | Information & communication | 2025 |
| Innovators Elite Limited | Wholesale & retail | 2024 |
| Inpo Ventures Ltd | Wholesale & retail | 2017 |
| Insight Training Centre UK Limited | Education | 2010 |
| Inspire to Learn Ltd | Education | 2026 |
| Insta Flyer Limited | Manufacturing | 2025 |
| Instahouse Limited | Real estate | 2019 |
| Intangian Limited | Information & communication | 2012 |
| Integral Focus Ltd | Health & social care | 2014 |
| Integral Partners Ltd | Wholesale & retail | 2014 |
| Integris Security Solutions Limited | Administrative & support | 2018 |
| Intellicreate Limited | Information & communication | 2023 |
| Intellidb Ltd | Information & communication | 2012 |
| Intelligence Systems Solutions Limited | Manufacturing | 2019 |
| Intergal Ltd | Construction | 2025 |
| Interior Emporium Ltd | Wholesale & retail | 2019 |
| Interlink Facilities Management Ltd | Administrative & support | 2019 |
| International Move Limited | Real estate | 2021 |
| International Pathways Education Ltd | Education | 2026 |
| International Scouts Volunteer Group (Isvg) Ltd | Education | 2023 |
| Intrinicity Ltd | Administrative & support | 2026 |
| Intuition Training Academy Ltd | Education | 2024 |
| Investment Detailed Property Ltd | Real estate | 2025 |
| Invicta London Ltd | Manufacturing | 2018 |
| Involution Consulting Ltd | Public administration | 2021 |
| Invotex London Limited | Manufacturing | 2015 |
| Inxs Entertainment Ltd | Arts & recreation | 2015 |
| Inyama & Co Limited | Professional & scientific | 2017 |
| Ioana Drive&Fly Ltd | Transport & logistics | 2025 |
| ION Dunca Ltd | Construction | 2015 |
| Ion.External Walls Limited | Construction | 2023 |
| IPA Electric Ltd | Construction | 2025 |
| Iqbal Sons Limited | Transport & logistics | 2025 |
| Iqfara Properties Limited | Real estate | 2023 |
| Iron Trip Ltd | Transport & logistics | 2017 |
| Ironwork Tours Ltd | Administrative & support | 2023 |
| Irwin Fishers Ltd | Real estate | 2020 |
| ISA Ferati Construction Ltd | Construction | 2016 |
| Isaac GM Limited | Construction | 2020 |
| Isdi Investments Ltd | Real estate | 2026 |
| ISH Ajooni Ltd | Wholesale & retail | 2021 |
| ISH Management UK Ltd | Households | 2023 |
| Ishaq Alam Ltd | Households | 2024 |
| Islamic Appeal | Administrative & support | 2016 |
| Islamic Impressions Ltd | Wholesale & retail | 2018 |