| Iqraa Ltd | Altrincham | 2025 |
| Iqraa School Limited | | 2007 |
| Iqrah Education & Cultural Centre | Cardiff | 2017 |
| Iqualifyu Ltd | London | 2024 |
| Iquk College Limited | Cambridge | 2013 |
| Iquk London Ltd | London | 2023 |
| Iquman Limited | London | 2014 |
| Irakai Educational Voluntary Organisation | London | 2020 |
| Irama Community CIC | Whyteleafe | 2023 |
| Iranian Association | London | 2007 |
| Iranian Healthcare Professionals UK Limited | London | 2026 |
| Iraq Driving School Limited | London | 2010 |
| Iraqi Board of Training Development and Consulting Ltd | London | 2021 |
| Iraqi Cultural Centre Ltd | Lancaster | 2022 |
| Iraqi Educational Trust | Manchester | 2005 |
| Iraqi Expatriates Organisation Limited | London | 2024 |
| Iraqi Forum for Intellectuals & Academics | London | 2015 |
| Iraqi Foundation for Foreign Policies Ltd | London | 2024 |
| Irate Investment Limited | Bridgend | 2013 |
| Irc-Uk Trading Limited | London | 2010 |
| Ireach Minds Limited | Darlington | 2017 |
| Iredford Ltd | London | 2025 |
| Ireland Motorsports CIC | Andover | 2024 |
| Ireland SE CIC | Belfast | 2012 |
| Iremote Coach Limited | Buckingham | 2026 |
| Irene Education Ltd | Glasgow | 2025 |
| Irepairman Limited | London | 2019 |
| Iresist Global CIC | London | 2025 |
| Irfan Muzaffar Ltd | Pinner | 2012 |
| Irian Psychology Ltd | London | 2024 |
| Iridium Education Ltd | Runcorn | 2016 |
| Irina Educational Services Ltd | Wallington | 2025 |
| Irina Turkce Ltd | London | 2024 |
| Iris Academies Trust | Camberley | 2014 |
| Iris Bertz Limited | Birmingham | 2004 |
| Iris Inspirations Ltd | Solihull | 2024 |
| Iris Leadership Insights Limited | London | 2023 |
| Iris Learning Trading Limited | Sunderland | 2017 |
| Iris Learning Trust | Sunderland | 2017 |
| Iris One United Ltd | Sutton | 2024 |
| Irish Centre for Operational Leadership Limited | Coleraine | 2024 |
| Irish Colleges Training Centre Limited | Northern Ireland | 2026 |
| Irish Dancing for Adults CIC | Omagh | 2024 |
| Irish Street Youth and Community Association | Londonderry | 2017 |
| IRL Education CIC | Kingussie | 2022 |
| Irlam Road Day Nursery Limited | Northwich | 2010 |
| IRM Global Ltd | London | 2022 |
| IRM International CIC | Glasgow | 2025 |
| Iron Circle 24 Limited | Pontypridd | 2024 |
| Iron Dominion Ltd | Harrogate | 2026 |
| Iron Education Academy Ltd | London | 2020 |
| Iron Forge Fitness Ltd | Loughton | 2025 |
| Iron Guidance Limited | Billingham | 2010 |
| Iron Horn Limited | London | 2026 |
| Iron K9 Training Ltd | Doncaster | 2026 |
| Iron Mill Education Limited | Manchester | 2011 |
| Iron Oak Gymnastics Limited | Bristol | 2026 |
| Iron Q Ltd | London | 2026 |
| Iron Raymond Football Club Ltd. | London | 2025 |
| Iron Sharpens Iron CIC | London | 2025 |
| Ironfist Boxing Ltd | Reading | 2020 |
| Ironhack UK Ltd | London | 2021 |
| Ironmanager Ltd | Windsor | 2016 |
| Ironmastersco CIC | Scunthorpe | 2025 |
| Ironstone Academy Trust | Middlesbrough | 2014 |
| Ironworks Sports Academy CIC | Gravesend | 2025 |
| Irrox Foundation | London | 2015 |
| Irshad Group Ltd | Bury St. Edmunds | 2021 |
| Irshad Ltd | Bury St. Edmunds | 2020 |
| IRT Aviation Ltd | Swindon | 2019 |
| Irve Griffiths Music Ltd | Axminster | 2015 |
| Irwc Certification Board Ltd | London | 2024 |
| Irwings Ltd | St. Albans | 2021 |
| ISA Academy Limited | Wolverhampton | 2025 |
| ISA Education Technologies Ltd | London | 2024 |
| ISA Sports and Wellbeing Limited | Southend-On-Sea | 2020 |
| ISA Training Limited | Hengoed | 1998 |
| ISA UK Consultancy Ltd | London | 2021 |
| ISA UK Development Ltd | Banstead | 2025 |
| Isa-Uk Ltd | Birmingham | 2014 |
| Isa.Connect CIC | Chelmsford | 2024 |
| Isaac Coaching Ltd | Bridgend | 2026 |
| Isaac Newell Heritage Group CIC | Rochester | 2025 |
| Isaac Odeniran Foundation Limited | London | 2001 |
| Isaan Aspire CIC | Oldham | 2025 |
| Isaar Welfare | Bolton | 2024 |
| Isab Limited | Babraham | 2009 |
| Isabel West Limited | Farnham Royal | 2011 |
| Isabella MAY Studios Limited | Epsom | 2026 |
| Isabellaglow Training Ltd | Scunthorpe | 2024 |
| Isabello's Pre-School Ltd | Hassocks | 2018 |
| Isabet Language Centre UK Ltd | London | 2019 |
| Isales Academy Limited | Dunstable | 2017 |
| Isandbox Ltd | Gravesend | 2015 |
| Isao International Statement Analysis Organization Ltd | Ruislip, | 2025 |
| Isap Academy Ltd | Tunbridge Wells | 2021 |
| Isarei Global Ltd | Newcastle Upon Tyne | 2026 |
| Isatere Services Limited | London | 2020 |
| Isbell Financial Training Limited | London | 2016 |
| Isbl Trading Limited | Leamington Spa | 2017 |