| I & T Tours Limited | Wholesale & retail | 2013 |
| I a (London) Investments Ltd | Real estate | 2015 |
| I a T Trading Ltd | Wholesale & retail | 2024 |
| I AM That I AM Ministries Limited | Health & social care | 2012 |
| I AM That I AM Temple Limited | Health & social care | 2012 |
| I AM Titanium Limited | Wholesale & retail | 2025 |
| I AM Your Designer Limited | Professional & scientific | 2015 |
| I Box Self Storage Ltd | Transport & logistics | 2019 |
| I Care for YOU Limited | Health & social care | 2022 |
| I Collect London Limited | Water & waste | 2025 |
| I Create Smiles Ltd | Other services | 2016 |
| I Developers Limited | Construction | 2016 |
| I Drive - Passenger Transport Ltd | Transport & logistics | 2016 |
| I Helix Building Ltd | Construction | 2025 |
| I Housing Ltd | Real estate | 2020 |
| I I Medicine Limited | Health & social care | 2018 |
| I K Interior Ltd | Construction | 2015 |
| I LET Solution Ltd | Real estate | 2018 |
| I Link Holdings Ltd | Wholesale & retail | 2018 |
| I Link Properties Ltd | Real estate | 2024 |
| I Love My Reg.Com Ltd | Wholesale & retail | 2011 |
| I M Ventures Limited | Real estate | 2013 |
| I P House Limited | Information & communication | 2015 |
| I P Tarba Ltd | Construction | 2024 |
| I PAY Direct Ltd | Real estate | 2018 |
| I Rise Campaign Limited | Health & social care | 2020 |
| I Smell Good Ltd | Information & communication | 2025 |
| I&A Bright Ltd | Real estate | 2024 |
| I&C Construct Ltd | Construction | 2025 |
| I&S N Ltd | Real estate | 2020 |
| I&V 2025 Services Limited | Administrative & support | 2025 |
| I'M Tiler Ltd | Construction | 2023 |
| I-Cell (London) Ltd | Wholesale & retail | 2019 |
| I-Lipo London Ltd | Health & social care | 2012 |
| I-Shine Cleaning Services Limited | Wholesale & retail | 2021 |
| I-Shopy Limited | Wholesale & retail | 2018 |
| I-Taz Ltd | Education | 2024 |
| I.A Healthcare Informatics Ltd | Information & communication | 2015 |
| I.F.I Construction Ltd | Manufacturing | 2026 |
| I.I Financial Services Limited | Financial services | 2017 |
| I.J.S Group Limited | Arts & recreation | 2017 |
| I.M.A Medical Ltd | Health & social care | 2021 |
| I.M.Y Properties Limited | Real estate | 2022 |
| I.T. Competitor Ltd | Information & communication | 1997 |
| I.T. Decisions Limited | Information & communication | 1987 |
| I2B Consultancy Ltd | Professional & scientific | 2024 |
| I43 Ltd | Extraterritorial | 2024 |
| IA Family Ltd | Wholesale & retail | 2018 |
| IA Fastfood Limited | Hospitality | 2023 |
| IA Test Dates Ltd | Administrative & support | 2026 |
| Iaam Agency Ltd | Professional & scientific | 2013 |
| IAB Investments Ltd | Real estate | 2019 |
| IAB Rise Ltd | Wholesale & retail | 2025 |
| Iacob Stores Ltd | Wholesale & retail | 2021 |
| Iadent Ltd | Health & social care | 2026 |
| IAI Apparel Fashion & Accessories Ltd | Wholesale & retail | 2025 |
| IAK Traders London Ltd | Construction | 2025 |
| IAM Rusu Ltd | Construction | 2015 |
| Iama London Ltd | Hospitality | 2024 |
| Iamthefirm Limited | Professional & scientific | 2025 |
| IAN Daniel Super Store Limited | Wholesale & retail | 2025 |
| IAO Investments Ltd | Real estate | 2018 |
| IAP Portfolio Limited | Real estate | 2023 |
| Iartistry Limited | Real estate | 2006 |
| IB Technologies Ltd | Wholesale & retail | 2024 |
| IBA Renovation Ltd | Construction | 2025 |
| Ibadat Collection Ltd | Wholesale & retail | 2026 |
| Ibas World Limited | Financial services | 2021 |
| Ibbi Traders Ltd | Construction | 2020 |
| IBH Properties Ltd | Real estate | 2024 |
| Ibic Ltd | Real estate | 2014 |
| Ibisian Limited | Construction | 2022 |
| Ibmo Ltd | Administrative & support | 2021 |
| IBN AUF Ltd | Wholesale & retail | 2026 |
| IBN Khalid Ltd | Hospitality | 2020 |
| IBN Sina Midcare Ltd | Health & social care | 2024 |
| Ibnaz Limited | Wholesale & retail | 2026 |
| Ibrahim & Athiqul Investment Limited | Real estate | 2025 |
| Ibrahim & Inaaya Ltd | Wholesale & retail | 2023 |
| Ibrahim Imports Limited | Wholesale & retail | 2026 |
| Ibrans IT Solutions Ltd | Wholesale & retail | 2024 |
| Ibrash Ltd | Wholesale & retail | 2026 |
| IBS Ltd | Construction | 2025 |
| Ibto Investments Holding Ltd | Real estate | 2017 |
| Ibuyer Ltd | Wholesale & retail | 2016 |
| IC Coman Limited | Construction | 2016 |
| IC Investment Group Limited | Administrative & support | 2025 |
| IC Pro Insulation Ltd | Construction | 2026 |
| IC Training Centre Limited | Administrative & support | 2011 |
| Icabit Ltd | Transport & logistics | 2017 |
| Icakes London Limited | Manufacturing | 2016 |
| Icare Experts Ltd | Administrative & support | 2022 |
| ICB Transfer Ltd | Financial services | 2021 |
| Ice App Ltd | Information & communication | 2024 |
| Ice Box Consultancy Limited | Information & communication | 2013 |
| Ice K4U Ltd | Hospitality | 2024 |
| Ice One Ltd | Construction | 2026 |
| Icentral UK Limited | Wholesale & retail | 2025 |
| Ichs Development Limited | Education | 2001 |
| Icicosmetic Ltd | Wholesale & retail | 2019 |