| Iqball Halal Meat Ltd | Wholesale & retail | 2022 |
| IR Precision Fitting Ltd | Manufacturing | 2026 |
| Ireach Ventures Ltd | Information & communication | 2022 |
| IRG Media Ltd | Professional & scientific | 2021 |
| Irimescu Ltd | Construction | 2024 |
| Irina Designs Ltd | Information & communication | 2025 |
| IRJ Global Limited | Transport & logistics | 2019 |
| Iron River Consultancy Ltd | Professional & scientific | 2022 |
| Ironclad Protection Services Ltd | Administrative & support | 2025 |
| IS Medicare Ltd | Wholesale & retail | 2018 |
| Isara ( PVT) Ltd | Administrative & support | 2019 |
| Iscjj Limited | Professional & scientific | 2009 |
| ISG 2 Limited | Real estate | 2019 |
| Ishanvi Intl Ltd | Real estate | 2021 |
| Ishanvi Trading Ltd | Wholesale & retail | 2024 |
| Ishaq Property Services Ltd | Real estate | 2021 |
| Ishar Enterprises (UK) Ltd | Wholesale & retail | 2017 |
| Ishleen Investments Ltd | Real estate | 2026 |
| Ishu Mohan Rethaken Ltd | Construction | 2025 |
| Iskaashi Relief and Development Organisation Ltd | Administrative & support | 2018 |
| Island Farm Development Ltd | Construction | 2023 |
| Isle of Education Ltd | Extraterritorial | 2019 |
| Ispykids Ltd | Wholesale & retail | 2017 |
| IST Builders Ltd | Construction | 2025 |
| Istanbul Filmmakers Ltd | Wholesale & retail | 2022 |
| IT Enterprisess Limited | Wholesale & retail | 2024 |
| IT Help Support Limited | Information & communication | 2014 |
| IT Solutions Consult Ltd | Information & communication | 2019 |
| It's Your Turn Driving Academy Ltd | Education | 2020 |
| Itacs Consultancy Limited | Information & communication | 2007 |
| Itechpro Ltd | Wholesale & retail | 2021 |
| Ithembhalami Ltd | Health & social care | 2019 |
| Itstaruk Limited | Other services | 2021 |
| Iver Food and Wine Ltd | Wholesale & retail | 2015 |
| Iver Pizza Ltd | Hospitality | 2026 |
| Iver Takeout Ltd | Hospitality | 2026 |
| Iver Tasty House Ltd | Hospitality | 2026 |
| Ivlushhair and Accessories Limited | Other services | 2025 |
| Ivstan Construction Ltd | Construction | 2016 |
| Ivstudio Limited | Construction | 2022 |
| IVY East Limited | Wholesale & retail | 2023 |
| IVY Skin Work Ltd | Professional & scientific | 2025 |
| Ivycreations UK Ltd | Wholesale & retail | 2011 |
| IWD Work Ltd | Information & communication | 2019 |
| IX47 Ltd | Information & communication | 2018 |
| Izumed Ltd | Health & social care | 2018 |
| J & D Events Limited | Administrative & support | 2014 |
| J & F Constructions Limited | Construction | 2021 |
| J & J Investment Property Ltd | Construction | 2020 |
| J & J Son’S Construction Ltd | Construction | 2025 |
| J & J Superstore Limited | Wholesale & retail | 2013 |
| J & J Trading (UK) Limited | Transport & logistics | 2003 |
| J & K Care and Support Limited | Health & social care | 2025 |
| J & R Steel Fabrication Limited | Manufacturing | 1994 |
| J a D Trading Limited | Construction | 2020 |
| J Basra Builders Limited | Construction | 2019 |
| J Brother Trading Limited | Construction | 2023 |
| J Bulders Ltd | Construction | 2016 |
| J D Asset Ventures Limited | Administrative & support | 2026 |
| J D H Consulting Engineers LLP | | 2005 |
| J Hornsby Interiors Limited | Administrative & support | 2009 |
| J J and Other Half Ltd | Wholesale & retail | 2020 |
| J J Brickwork Ltd | Construction | 2023 |
| J K S Property Management Ltd | Real estate | 2026 |
| J M Turna Ltd | Real estate | 2022 |
| J Nath & Sons Ltd | Wholesale & retail | 2026 |
| J P D Electrical Ltd | Construction | 2007 |
| J R Griffiths (Servicing) Limited | Manufacturing | 2013 |
| J S Buildings & Construction Ltd | Construction | 2022 |
| J S Chauffeuring Limited | Transport & logistics | 2013 |
| J S M Building Surveying Ltd | Construction | 2023 |
| J S Staircase Ltd | Construction | 2018 |
| J Sall Properties Ltd | Real estate | 2020 |
| J Sekhon Transport Ltd | Transport & logistics | 2025 |
| J Singh Sandhu Ltd | Transport & logistics | 2025 |
| J Sons UK Investments Ltd | Real estate | 2018 |
| J Star Building & Roofing Ltd | Construction | 2025 |
| J T Decorators Ltd | Construction | 2019 |
| J Tongue Sound Ltd | Information & communication | 2015 |
| J VAZ Events Limited Limited | Administrative & support | 2025 |
| J&C Advisory Services Limited | Professional & scientific | 2022 |
| J&D Entertainment Ltd | Information & communication | 2025 |
| J&G Properties London Ltd | Real estate | 2026 |
| J&H Paradise Developments Ltd | Real estate | 2026 |
| J&H Transport Ltd | Transport & logistics | 2024 |
| J&I Builders Ltd | Construction | 2022 |
| J&J Build Ltd | Construction | 2019 |
| J&J Property Investments Ltd | Real estate | 2019 |
| J&K Consulting Ltd | Professional & scientific | 2020 |
| J&K Empire Limited | Wholesale & retail | 2016 |
| J&M Accident Repair Center Ltd | Wholesale & retail | 2022 |
| J&M Investments (Properties) Ltd | Real estate | 2025 |
| J&M Trade Ltd | Construction | 2026 |
| J&R Transport Limited | Transport & logistics | 2026 |
| J&S Associates (London) Limited | Professional & scientific | 2025 |
| J&S UK Investments Ltd | Real estate | 2025 |
| J'Adore My Skin Limited | Other services | 2014 |
| J.B. of London Ltd | Manufacturing | 2015 |
| J.C Steel Ltd | Construction | 2017 |
| J.D.Supplier Limited | Wholesale & retail | 2013 |