| Iadeti Igreja Assembleia DE Deus Tirirical International Ltd | Other services | 2026 |
| Iajp Ltd | Real estate | 2024 |
| IAM Reward Ltd | Wholesale & retail | 2022 |
| Iamsiraad Ltd | Information & communication | 2021 |
| IAN Properties Ltd | Real estate | 2025 |
| Iasmina Delivery Limited | Transport & logistics | 2018 |
| IBA Khan Limited | Wholesale & retail | 2025 |
| Ibah Group Ltd | Wholesale & retail | 2025 |
| Ibex Kitchens Ltd | Wholesale & retail | 2022 |
| Ibmsy Limited | Real estate | 2018 |
| IBR Aashish Chinese Ltd | Hospitality | 2025 |
| Ibr.Pro Ltd | Construction | 2026 |
| Ibrahim Professional Solutions Limited | Professional & scientific | 2021 |
| IBX Solutions Limited | Wholesale & retail | 2021 |
| Ibze Homes Ltd | Real estate | 2022 |
| IC Building Services Limited | Real estate | 2025 |
| IC Construct Limited | Construction | 2020 |
| Ican Jewellery Ltd | Wholesale & retail | 2025 |
| Icarii Ltd | Real estate | 2022 |
| Ice on the Go Limited | Hospitality | 2021 |
| Iceport Limited | Real estate | 2011 |
| Iceport One Limited | Real estate | 2016 |
| Iceport Two Limited | Real estate | 2018 |
| Ichiba UK Limited | Hospitality | 2017 |
| Ichimi Limited | Wholesale & retail | 2020 |
| Icon Kitchens Wembley Ltd | Professional & scientific | 2025 |
| Iconic Bliss Limited | Wholesale & retail | 2025 |
| Iconic Smiles Cheshunt Ltd | Real estate | 2025 |
| Iconic Smiles Friern Barnet Limited | Health & social care | 2024 |
| ICP1 Limited | Real estate | 2022 |
| ICS Szekely Ltd | Construction | 2021 |
| IDA Care Management LLP | | 2020 |
| IDA Maintenance Limited | Construction | 2017 |
| Ideal Consulting and Business Services Ltd | Professional & scientific | 2025 |
| Ideal Deco Ltd | Construction | 2026 |
| Ideal Lift Trucks Limited | | 1984 |
| IDM Practical Solutions Ltd | Other services | 2011 |
| Idocs.Biz (UK) Limited | Health & social care | 2011 |
| IE Support Ltd | Professional & scientific | 2024 |
| IEC Business Services Limited | Real estate | 2023 |
| IEM Services Ltd | Construction | 2018 |
| Ifacility Limited | Information & communication | 2022 |
| IFK Trading Ltd | Wholesale & retail | 2026 |
| IG Business and Luxury Consultancy Ltd | Professional & scientific | 2020 |
| Igirisu-Net Ltd | Wholesale & retail | 2020 |
| Ignite Autos Ltd | Wholesale & retail | 2020 |
| IGO Travel Ltd | Transport & logistics | 2015 |
| IGO Trips Ltd | Administrative & support | 2009 |
| Igormotor Limited | Wholesale & retail | 2018 |
| Igoy Ltd | Transport & logistics | 2024 |
| Ihasis Electronic Limited | Wholesale & retail | 2023 |
| Ihrc Legal Ltd | Professional & scientific | 2023 |
| IHS Consulting Ltd. | Information & communication | 2020 |
| Ihsan International Limited | Manufacturing | 2021 |
| IIC Rail Limited | Construction | 2015 |
| Iikaya Solutions UK Ltd | Wholesale & retail | 2024 |
| IJL Associates Ltd | Real estate | 2022 |
| IKA Refurbishment Limited | Construction | 2008 |
| Ikhoi Recruitment Ltd | Administrative & support | 2011 |
| Ikkabaa Ltd | Wholesale & retail | 2025 |
| IKN Limited | Real estate | 2018 |
| Ikuku Solutions Ltd | Health & social care | 2024 |
| Ilearning Driving School Ltd | Education | 2023 |
| Ilemi Ltd | Professional & scientific | 2025 |
| Ilias Construction Ltd | Construction | 2018 |
| Ilie Group Ltd | Construction | 2018 |
| Ilift Fitness Limited | Manufacturing | 2015 |
| Illamwadi Ltd | Professional & scientific | 2024 |
| Illuminated Health Limited | Health & social care | 2014 |
| Illumination (UK) Limited | Construction | 2001 |
| Ilmbridge Limited | Education | 2026 |
| Ilyen Construction Ltd | Construction | 2025 |
| Image Roofing Limited | Construction | 2013 |
| Imagianation Ltd | Wholesale & retail | 2012 |
| Imalgo Limited | Real estate | 1987 |
| Imam Mart Ltd | Wholesale & retail | 2024 |
| Iman Products Trading Ltd | Wholesale & retail | 2025 |
| IMC British Ltd | Information & communication | 2015 |
| IMC Management Ltd | Real estate | 2021 |
| IMC Property Limited | Real estate | 2013 |
| IMH Ltd | Financial services | 2026 |
| Imhad Ltd | Real estate | 2023 |
| Imilingo Limited | Information & communication | 2018 |
| Immigration Inn Ltd | Administrative & support | 2020 |
| Immigration Premium Limited | Professional & scientific | 2007 |
| Immnet Limited | Information & communication | 2025 |
| Imogen Services Limited | Professional & scientific | 2018 |
| Imol Associates Ltd | Real estate | 2013 |
| IMP Group Logistics Limited | Transport & logistics | 2025 |
| Impac UK Limited | Administrative & support | 2006 |
| Impact Studios Ltd | Wholesale & retail | 2016 |
| Impcead Limited | Professional & scientific | 2017 |
| Imperfeckt Diamonds Limited | Wholesale & retail | 2026 |
| Imperial Financial Accountants Ltd | Professional & scientific | 2018 |
| Impex International Ltd | Wholesale & retail | 2025 |
| Implant Dental LAB Ltd | Manufacturing | 2024 |
| Impulse Support Limited | Health & social care | 2021 |
| Imxp Ltd | Wholesale & retail | 2011 |
| IN & OUT Car Wash Limited | Administrative & support | 2018 |
| IN 1 Group Ltd | Information & communication | 2024 |