| Iqan Property Limited | Real estate | 2023 |
| Iqan Services Limited | Transport & logistics | 2026 |
| Iqbal Computer Services Ltd | Information & communication | 2022 |
| Iqbal Halal Butchers Limited | Wholesale & retail | 2024 |
| Iqonic Sports Ltd | Wholesale & retail | 2020 |
| Irestore Tech Ltd | Other services | 2025 |
| Iretail UK Ltd | Wholesale & retail | 2022 |
| Irfan Travels Ltd | Administrative & support | 2022 |
| Irha Collection London Ltd | Wholesale & retail | 2019 |
| Irina Household Ltd | Wholesale & retail | 2026 |
| Irisz Limited | Administrative & support | 2025 |
| Iron Castel Ltd | Real estate | 2025 |
| Irsaa Ltd | Construction | 2023 |
| IRV Global Ltd | Information & communication | 2026 |
| Irza Services Ltd | Wholesale & retail | 2022 |
| Isbm University [India] London Ltd | Education | 2025 |
| Iscuela Ltd | Information & communication | 2025 |
| Iservetheface Ltd | Other services | 2025 |
| ISG Mackinnon Ltd | Professional & scientific | 2014 |
| Isha Nails & Beauty Salon Ltd | Other services | 2025 |
| Ishak Services Ltd | Construction | 2026 |
| Isher Construction Limited | Construction | 2017 |
| Isher Roof Ltd | Construction | 2025 |
| Ishkama Global CIC | Health & social care | 2022 |
| Ishop Online Limited | Wholesale & retail | 2015 |
| Isiwd Ltd | Wholesale & retail | 2021 |
| Islamic Finance Review Ltd | Information & communication | 2025 |
| Isle 88 Essence Ltd | Wholesale & retail | 2025 |
| Isleworth TW7 Ltd | Real estate | 2023 |
| Ismashed Limited | Wholesale & retail | 2024 |
| Isoft Info Solutions Ltd | Information & communication | 2016 |
| Isoft Networks Limited | Information & communication | 2019 |
| ISP Property Ltd | Real estate | 2022 |
| Ispecialist Limited | Administrative & support | 2011 |
| Isrr Limited | Health & social care | 2024 |
| Issorcim Limited | Hospitality | 2026 |
| Istanbul Grill Hounslow West Limited | Hospitality | 2022 |
| ISW Transport Limited | Transport & logistics | 2025 |
| Isynergy Management Ltd | Financial services | 2016 |
| IT Hub Technology Solutions Limited | Information & communication | 2024 |
| IT Tele Sales Ltd | Information & communication | 2018 |
| IT TRP Limited | Administrative & support | 2018 |
| It's Big Bazar Ltd. | Wholesale & retail | 2023 |
| Itech London Limited | Wholesale & retail | 2025 |
| Itech Solutions One Limited | Wholesale & retail | 2017 |
| ITG Logistics Ltd | Transport & logistics | 2025 |
| Ithub Solutions Limited | Information & communication | 2016 |
| Itinim Limited | Information & communication | 2017 |
| Itiya Limited | Wholesale & retail | 2025 |
| ITP Properties Limited | Real estate | 2016 |
| Itpandits Limited | Information & communication | 2010 |
| ITS Convenient Limited | Wholesale & retail | 2014 |
| ITS Halal Meat Hounslow Ltd. | Wholesale & retail | 2025 |
| IUB UK Ltd | Professional & scientific | 2016 |
| IV Design Ltd | Wholesale & retail | 2022 |
| IVA Plants Ltd | Manufacturing | 2024 |
| Ivanciuv Limited | Manufacturing | 2025 |
| Ivanka Company Ltd | Hospitality | 2024 |
| Iver Group Limited | Real estate | 2025 |
| Iver Shisha Lounge Limited | Hospitality | 2025 |
| Ivoltaje Limited | Wholesale & retail | 2015 |
| Ivory Health Clinic Limited | Health & social care | 2024 |
| Ivscut Limited | Transport & logistics | 2026 |
| IVY Hair Studio LDN Ltd | Other services | 2022 |
| IVY Lodge Residents Association Limited | Real estate | 1991 |
| Iwmc SUB Limited | Real estate | 2026 |
| IX Motors Ltd | Wholesale & retail | 2007 |
| Ixvi Ltd | Professional & scientific | 2025 |
| IY Agency AD Accounts Ltd | Professional & scientific | 2023 |
| Iyjh Limited | Construction | 2026 |
| J & Ajooni Ltd | Transport & logistics | 2025 |
| J & M Home Improvement and Construction Limited | Construction | 2016 |
| J & M Partners Ltd | Hospitality | 2025 |
| J & M Refrigeration Ltd | Manufacturing | 2012 |
| J & P Retail Shop Limited | Wholesale & retail | 2016 |
| J and M Gill Ltd | Real estate | 2020 |
| J C Fern Properties Ltd | Real estate | 2019 |
| J Extra Mile Ltd | Transport & logistics | 2021 |
| J J Building Construction Ltd | Construction | 2021 |
| J K Autos Enterprises Ltd | Wholesale & retail | 2024 |
| J K Bajwa Ltd | Transport & logistics | 2025 |
| J K Prestige Cars Limited | Wholesale & retail | 2024 |
| J Moonlight Investments Limited | Construction | 2024 |
| J R S Haulage Ltd | Manufacturing | 2018 |
| J S Contractors (UK) Ltd | Construction | 2014 |
| J S Grover & Sons Ltd | Wholesale & retail | 2022 |
| J S Property Developers Limited | Construction | 2015 |
| J Star Groundworks Ltd | Construction | 2025 |
| J Toor Property Ltd | Households | 2025 |
| J&B Eagle Ltd | Transport & logistics | 2024 |
| J&H Superstore Ltd | Wholesale & retail | 2026 |
| J&J Heating & Plumbing Ltd | Construction | 2019 |
| J&K Builders Ltd | Construction | 2019 |
| J&K E Commerce Ltd | Wholesale & retail | 2021 |
| J&K Freight Ltd | Transport & logistics | 2015 |
| J&K Real Estate Ltd | Real estate | 2026 |
| J&M Home Improvements and Construction UK Limited | Construction | 2011 |
| J&M Real Estate Investments Ltd | Real estate | 2024 |
| J&N Private Limited | Wholesale & retail | 2025 |
| J'S Health and Wellbeing Ltd | Health & social care | 2021 |