| Iwiqyn Ltd | Plymouth | 2026 |
| Iwollo Omashi UK Limited | Dagenham | 2024 |
| Iwoman Academy CIC | Liverpool | 2016 |
| Iworkout Ltd | Warwick | 2020 |
| Iwqf Ltd | London | 2024 |
| IWS Online School Ltd | Cardiff | 2023 |
| Iwsc Ltd | Aberdeen | 2023 |
| IX Academics Limited | Wantage | 2010 |
| IX Forum Ltd | Blackpool | 2024 |
| Ixsd Academy Limited | Stockport | 2018 |
| Ixworth Vagabonds Cricket Club Ltd | Bury St Edmunds | 2016 |
| IY Talks Ltd | Uxbridge | 2024 |
| Iyaa Limited | London | 2022 |
| Iykris Consulting Solutions Limited | London | 2024 |
| Iyma Ltd | Manchester | 2018 |
| IYS Consultancy Limited | Leeds | 2013 |
| IZA Foundation @ Arts and Music | Glasgow | 1999 |
| Izcas Ltd | Newcastle Upon Tyne | 2026 |
| IZI Metropolitan Services Ltd | London | 2022 |
| Izil Company Ltd | London | 2026 |
| Izipen Limited | London | 2018 |
| Izol Limited | Carshalton | 2020 |
| Izzah Ltd | Nottingham | 2025 |
| Izzy Island Limited | Carnforth | 2003 |
| Izzy Living Ltd | Seaton | 2017 |
| Izzylfit Ltd | Chelmsford | 2023 |
| J & a Education Limited | Witney | 2011 |
| J & B Education Limited | Fareham | 2023 |
| J & C Holdings Warwickshire Limited | Coventry | 2026 |
| J & D Training Limited | Lye | 2014 |
| J & E Training Consultants Limited | Romford | 2001 |
| J & K Nursery`S Ltd | Southport | 2006 |
| J & M Training Services Hull Limited | Hull | 2015 |
| J & M Yeomans Limited | Brierley Hill | 2012 |
| J & P Sports CIC | Nuneaton | 2024 |
| J & R Care Limited | Longfield | 2002 |
| J & S Development Services Ltd | London | 2019 |
| J & Z Property Education Ltd | Worksop | 2024 |
| J a B Training & Consultancy Limited | Rugby | 2022 |
| J a Dance Ltd | Manchester | 2024 |
| J a Driving Tuition Limited | Scarborough | 2002 |
| J and C First AID Training Ltd | Rickmansworth | 2018 |
| J and F Wood Education Ltd | London | 2024 |
| J and J Consulting London Ltd | Romford | 2024 |
| J and J Driving School Limited | Belfast | 2024 |
| J Artistry Clinic Ltd | Coventry | 2025 |
| J B Educational Consultancy Limited | St. Ives | 2016 |
| J B Jeyaretnam Foundation | London | 2014 |
| J Ball Education Ltd | Shrewsbury | 2026 |
| J Barker Fitness Ltd | High Wycombe | 2024 |
| J Bestwick Tutoring & Teaching Services Limited | Rotherham | 2019 |
| J Blunden Fitness Ltd | Sheffield | 2022 |
| J Brooks PT Limited | Altrincham | 2025 |
| J C Competency and Training Limited | Newton Aycliffe | 2015 |
| J C Maxwell Limited | York | 2020 |
| J C Mist Driver Training Limited | Shenfield | 2016 |
| J Christopher Consulting Ltd | Sutton Coldfield | 2025 |
| J Cupitt Sports Academy Limited | Holywood | 2019 |
| J D Mindcoach Ltd | Nottingham | 2014 |
| J Downes Ltd | Newcastle | 2022 |
| J E Academy Limited | Stoke-On-Trent | 2021 |
| J E Mynott Limited | Rugby | 2015 |
| J E Schofield Consultancy Ltd | York | 2025 |
| J Evans Limited | Pontyclun | 2010 |
| J F Lavery Ltd | Stockport | 2019 |
| J Fish Education Limited | Carnforth | 2015 |
| J Foster Send Consultancy Ltd | Derby | 2019 |
| J G Financial Training Limited | London | 2008 |
| J Grace Services Limited | Woking | 2019 |
| J H Bulman Consultancy Ltd | Market Rasen | 2015 |
| J H Educational Services Limited | Colchester | 2013 |
| J H Mobbs Education Ltd | Halesworth | 2021 |
| J H R Consultants Limited | Dorchester | 2015 |
| J Hankin Holdings Ltd | Wokingham | 2024 |
| J Henley Ltd | Ruislip | 2023 |
| J Hewitt Teaching Support Ltd | Preston | 2020 |
| J J Training Centre Ltd | Basildon | 2019 |
| J K Care Limited | Cobham | 2006 |
| J K Childcare Management Ltd | Brechin | 2021 |
| J K Maths Tutoring Ltd | Coventry | 2026 |
| J K N a Training Limited | Abbots Langley | 2005 |
| J K Safety Training Limited | Gillingham | 2015 |
| J L Aesthetics Training Limited | Norwich | 2026 |
| J L Hesketh Ltd | Liverpool | 2023 |
| J M Clarke Ltd | London | 2011 |
| J M J Performance & Lifestyle Ltd | Birmingham | 2018 |
| J M Price School of Mathematics Ltd | Bargoed | 2022 |
| J M Training & Product Academy Limited | Pontypridd | 2024 |
| J MAC Education Ltd | Kidlington | 2025 |
| J Music Supreme Limited | Bolton | 2017 |
| J Nurseries Ltd | Andover | 2024 |
| J Olanya Sports Ltd | Manchester | 2022 |
| J P Alternative Education Limited | Rugeley | 2018 |
| J P Brookes Ltd | Manchester | 2018 |
| J Patterson Tutors Ltd | Waltham Abbey | 2022 |
| J PI Maths Tutoring Ltd | London | 2024 |
| J Plenty Ltd | Radstock | 2025 |
| J Point Medical Training Ltd | Bristol | 2023 |
| J R Education Limited | Barwell | 2011 |
| J Roberts Psychology Ltd | London | 2023 |