| Hyphen Glazing Ltd | Construction | 2025 |
| HZ Trader Ltd | Information & communication | 2021 |
| I & a Services Ltd | Manufacturing | 2020 |
| I AM a Human First Ltd | Health & social care | 2021 |
| I B Haulage Ltd | Transport & logistics | 2021 |
| I Connect Finance Ltd | Information & communication | 2026 |
| I F E Global Logistics (London) Limited | Transport & logistics | 2014 |
| I Vision Global Ltd | Health & social care | 2026 |
| I Ware Information Systems Ltd | Information & communication | 2014 |
| I&E Transport Limited | Transport & logistics | 2018 |
| I&M Enterprises Ltd | Wholesale & retail | 2022 |
| I-Arnik Consulting Limited | Real estate | 2024 |
| I-Bitz Solutions Limited | Information & communication | 2011 |
| I-Class Technologies Limited | Information & communication | 2026 |
| I-Plan Services Ltd | Construction | 2017 |
| I.T. Way Trans Group Clearance LLP | | 2017 |
| I.Z Baroca Ltd | Administrative & support | 2019 |
| Iaas Global Limited | Education | 2023 |
| IAG Aggregates Limited | Construction | 2015 |
| IAG Cargo Limited | Transport & logistics | 2012 |
| IAK Catering Ltd | Hospitality | 2025 |
| IB Fast Learning Ltd | Education | 2025 |
| IBA Transport Ltd | Transport & logistics | 2026 |
| Iblanc Cosmetics Ltd | Wholesale & retail | 2023 |
| IBN Marketing Ltd. | Wholesale & retail | 2016 |
| IBO Transportation Limited | Transport & logistics | 2025 |
| IBR Scaffolding Ltd | Construction | 2020 |
| IBS3 Ltd | Other services | 2016 |
| IBZ World Imports Ltd | Wholesale & retail | 2018 |
| ICA Construct Limited | Construction | 2017 |
| Icare Mobiles Limited | Wholesale & retail | 2020 |
| Iccountant Ltd | Professional & scientific | 2022 |
| Icertis Ventures Limited | Real estate | 2024 |
| ICH Express Limited | Transport & logistics | 2019 |
| Ichra Ltd | Wholesale & retail | 2025 |
| Icoaches Ltd | Transport & logistics | 2014 |
| Icon Training Solutions Limited | Administrative & support | 2019 |
| Iconic Beauties Ltd | Other services | 2024 |
| Icontractors Ltd | Construction | 2021 |
| Icrew Ltd | Information & communication | 2021 |
| ICT Consulting Services Limited | Information & communication | 2023 |
| Icube Construction Ltd | Construction | 2020 |
| Icube Properties Ltd | Real estate | 2020 |
| ID Autospray Limited | Wholesale & retail | 2022 |
| Idea (PVT) Ltd | Other services | 2017 |
| Ideal International Logistics UK Ltd | Transport & logistics | 2019 |
| Ideal Property Investment (London) Ltd | Real estate | 2026 |
| Ideas Factorial IT Ltd | Information & communication | 2015 |
| Idental Limited | Health & social care | 2010 |
| Ideology Deals Limited | Wholesale & retail | 2018 |
| IDF Marketing Services Limited | Wholesale & retail | 2015 |
| Idionkanta Care Limited | Health & social care | 2013 |
| IEX Cranes Ltd | Wholesale & retail | 2021 |
| Ifix Prints Ltd | Manufacturing | 2024 |
| Ifixmobile Limited | Wholesale & retail | 2016 |
| Ifonezone Ltd | Wholesale & retail | 2024 |
| Iftico Ltd | Wholesale & retail | 2023 |
| Igccd Ltd | Information & communication | 2025 |
| Iglobe Communication Limited | Wholesale & retail | 2023 |
| Ignatius Packaging Limited | Wholesale & retail | 2025 |
| Ignexio Co Ltd | Wholesale & retail | 2021 |
| Igor Build Ltd | Construction | 2026 |
| IGS Healthcare UK Ltd | Health & social care | 2023 |
| IGS Signs and Design Ltd | Professional & scientific | 2026 |
| Ihomes Estate Agents Ltd | Real estate | 2007 |
| Ihrava Limited | Wholesale & retail | 2026 |
| IIY Phytoventra Ltd | Wholesale & retail | 2017 |
| IJ Mobiles Limited | Wholesale & retail | 2024 |
| Ikhan Properties Ltd | Real estate | 2023 |
| Iklondon Limited | Financial services | 2024 |
| Ikumar Ltd | Manufacturing | 2026 |
| IL Bebo's Lounge Ltd | Hospitality | 2023 |
| Ilevio Limited | Transport & logistics | 2019 |
| Illo Removals Ltd | Transport & logistics | 2019 |
| Ilona Food & Wine Ltd | Wholesale & retail | 2018 |
| IM & IR Brothers Ltd | Administrative & support | 2015 |
| Imaan Estate Ltd | Real estate | 2026 |
| Imaginactive Ltd | Arts & recreation | 2014 |
| Imaging Experts Limited | Extraterritorial | 2022 |
| Iman Group Limited | Wholesale & retail | 2022 |
| Iman Services Ltd | Wholesale & retail | 2021 |
| Imaxx Holding Ltd | Financial services | 2023 |
| Iminfocom Ltd | Information & communication | 2010 |
| Imipak Ltd | Wholesale & retail | 2019 |
| Immaculate Care Limited | Administrative & support | 2015 |
| Immensus Solutions Limited | Information & communication | 2010 |
| Immex Immediate Express UK Ltd | Transport & logistics | 2018 |
| Immigration and Visa Services Limited | Professional & scientific | 2025 |
| Immortal Icon Ltd | Manufacturing | 2022 |
| Imnot Limited | Professional & scientific | 2016 |
| IMO International Ltd | Education | 2020 |
| Impact - Property Improvements Ltd | Administrative & support | 2017 |
| Impactwise Careers and Education Ltd | Education | 2022 |
| Imperia Consulting Ltd | Professional & scientific | 2017 |
| Imperial Auto Mart Ltd | Wholesale & retail | 2024 |
| Imperial Coffee Bar and Restaurant Ltd | Hospitality | 2020 |
| Imperial Food & Wine Ltd | Wholesale & retail | 2024 |
| Imperial Guest House Limited | Hospitality | 2017 |
| Imperial Lettings Management Ltd | Real estate | 2016 |
| Imperial Luxury Catering Ltd | Manufacturing | 2024 |