| ICN Global Estates Limited | Real estate | 2024 |
| Icon Associates (BD) Limited | Extraterritorial | 2014 |
| Icon East London Ltd | Real estate | 2017 |
| Icon Resourcing UK Ltd | Administrative & support | 2024 |
| Iconic Developers UK Ltd | Construction | 2025 |
| Iconic Homes 4U Ltd | Real estate | 2023 |
| Iconic Land Ltd | Real estate | 2025 |
| Iconic Shopfront London Ltd | Construction | 2019 |
| Iconica Group Ltd | Wholesale & retail | 2019 |
| ICP Chauffeur Ltd | Transport & logistics | 2024 |
| ID Security Ltd | Administrative & support | 2014 |
| IDA Building Limited | Extraterritorial | 2019 |
| Idea Academy London Ltd | Education | 2014 |
| Idea Management Limited | Other services | 2022 |
| Ideacloud Ltd | Information & communication | 2014 |
| Ideal Bargains Ltd | Other services | 2011 |
| Ideal Bespoke Kitchens & Bedrooms Ltd | Other services | 2021 |
| Ideal Build Limited | Construction | 2016 |
| Ideal Care Group Ltd | Administrative & support | 2023 |
| Ideal Care Solutions (ICS) Limited | Real estate | 2011 |
| Ideal Chauffeur Limited | Transport & logistics | 2025 |
| Ideal Chicken & Pizza Ltd | Hospitality | 2025 |
| Ideal Constructions 4 U Ltd | Construction | 2016 |
| Ideal Cosmetics Ltd | Other services | 2021 |
| Ideal Data Limited | Administrative & support | 1997 |
| Ideal Design & Build Ltd | Construction | 2014 |
| Ideal Education and IT Limited | Information & communication | 2025 |
| Ideal Halal Limited | Wholesale & retail | 2004 |
| Ideal Home Construction Ltd | Construction | 2013 |
| Ideal Home Constructions London Ltd | Construction | 2024 |
| Ideal Housing Solutions Ltd | Real estate | 2011 |
| Ideal Insolation Ltd | Construction | 2024 |
| Ideal Move Ltd | Real estate | 2022 |
| Ideal Recovery Ltd | Water & waste | 2023 |
| Ideal Tech London Limited | Wholesale & retail | 2018 |
| Ideal Warren INT Ltd | Information & communication | 2026 |
| Ideas Station Central Ltd | Hospitality | 2014 |
| Ideasfromdreams Ltd | Wholesale & retail | 2024 |
| Ideation Consultancy Limited | Other services | 2013 |
| Ideation Enterprises Limited | Wholesale & retail | 2012 |
| Idem Ltd | Construction | 2018 |
| Idens Aesthetics Limited | Other services | 2024 |
| Idens Investments Ltd | Real estate | 2022 |
| IDK Property Ltd | Real estate | 2025 |
| Idlehaus Limited | Arts & recreation | 2025 |
| Idor Finance Company Limited | Financial services | 1963 |
| Idream Builders Ltd | Administrative & support | 2018 |
| Idrive Chauffeurs Ltd | Transport & logistics | 2013 |
| Idroid Stores Limited | Wholesale & retail | 2014 |
| IDS Solicitors Ltd | Professional & scientific | 2022 |
| Idun 1 Ltd | Real estate | 2026 |
| Idun Ltd | Real estate | 2019 |
| Idyllic Limited | Information & communication | 2014 |
| IEE Birmingham Ltd | Administrative & support | 2019 |
| IES Consultants Ltd | Administrative & support | 2025 |
| Ifashion Club Ltd | Wholesale & retail | 2017 |
| Iffah Products Ltd | Other services | 2017 |
| IFI Consulting Ltd | Professional & scientific | 2022 |
| Ifin Ltd | Information & communication | 2025 |
| Ifinocean Ltd | Real estate | 2026 |
| Ifix GUY Limited | Other services | 2015 |
| Iflats Ltd | Hospitality | 2018 |
| IFM Construction Limited | Construction | 2023 |
| IFM Properties Limited | Real estate | 2021 |
| IFP Investors Ltd | Real estate | 2024 |
| Ifra Consulting Limited | Information & communication | 2026 |
| Ifyu Enterprises Ltd | Wholesale & retail | 2024 |
| IFZ Transport Ltd | Transport & logistics | 2025 |
| IG Corporation Limited | Other services | 2025 |
| IG Excavations Limited | Construction | 2017 |
| IG Mechanical Group Ltd | Construction | 2026 |
| IG Sellers Ltd | Wholesale & retail | 2024 |
| IG Services Limited | Administrative & support | 2025 |
| IG Utility Construct Ltd | Construction | 2024 |
| Ig-Soc Ltd | Administrative & support | 2022 |
| IG1 Holdings Ltd | Real estate | 2025 |
| IG1 Roof & Building Maintenance Ltd | Construction | 2018 |
| IG6 Ltd | Wholesale & retail | 2021 |
| IGD Construction Interior Ltd | Manufacturing | 2020 |
| Igloo Management Ltd | Real estate | 2026 |
| Igloo Town Ltd | Manufacturing | 2021 |
| Ignis Professional Safety Ltd | Public administration | 2025 |
| Ignis Shield Ltd | Administrative & support | 2025 |
| Ignite GAS & Plumbing Limited | Construction | 2017 |
| Ignite Health 360 Limited | Professional & scientific | 2025 |
| Ignite Investment Management Ltd | Real estate | 2018 |
| Ignite Property Asset Management Ltd | Real estate | 2013 |
| Ignite Technologies International Limited | Construction | 2021 |
| Ignitepeak Ltd | Wholesale & retail | 2025 |
| Ignition Advisory Ltd | Professional & scientific | 2025 |
| Ignition House London Limited | Wholesale & retail | 2025 |
| IGR Julian Services Limited | Transport & logistics | 2018 |
| Igreen Technology Ltd | Wholesale & retail | 2019 |
| IGS London Limited | Information & communication | 2018 |
| Igwe of Beauty Ltd | Manufacturing | 2025 |
| IH Green Investments Ltd | Real estate | 2023 |
| IHA Global Ltd | Real estate | 2022 |
| Ihategarages Ltd | Wholesale & retail | 2025 |
| Ihek Limited | Construction | 2020 |
| Ihems Property Ltd | Real estate | 2017 |