| Ipacs UK Ltd | Administrative & support | 2004 |
| Ipay Consultancy Ltd | Financial services | 2024 |
| Ipearl by Tabitha Ltd | Wholesale & retail | 2025 |
| Ipexc the Investment Property Exchange Ltd | Real estate | 2023 |
| IPH Detailing Ltd | Administrative & support | 2026 |
| Ipharm (UK) Ltd | Health & social care | 2011 |
| Ipharma Consultancy Ltd | Professional & scientific | 2024 |
| Ipharma Distributors Ltd | Wholesale & retail | 2024 |
| Ipho Limited | Hospitality | 2018 |
| IPL Soccer 2022 Limited | Arts & recreation | 2024 |
| IPM Construct Ltd | Extraterritorial | 2024 |
| Iprinthub Ltd | Manufacturing | 2018 |
| Ips-Integrated Project Services Limited | Professional & scientific | 2013 |
| Ipsl Repack Ltd | Manufacturing | 2017 |
| Ipswich Crescent 6167 Birmingham RTE Company Limited | Households | 2004 |
| IPURITY3 Ltd | Financial services | 2017 |
| IPX Holding Limited | Financial services | 2025 |
| IPX International Holdings Limited | Financial services | 2026 |
| IQ Centre Ltd | Arts & recreation | 2022 |
| IQ Club Ltd | Professional & scientific | 2019 |
| IQ Coaches Ltd | Transport & logistics | 2023 |
| IQ Developments (AL) Limited | Construction | 2006 |
| IQ Education Investment Limited | Education | 2013 |
| IQ Education Limited | Education | 2013 |
| IQ Learning Centre Ltd | Education | 2024 |
| IQ Legal Ltd | Professional & scientific | 2020 |
| IQ Schools Group Ltd | Education | 2015 |
| IQ Tutorial Services Limited | Education | 2009 |
| Iqas Properties Limited | Real estate | 2023 |
| IQB Ltd | Real estate | 2025 |
| Iqbal & Aslam Food Co Limited | Hospitality | 2024 |
| Iqbal & Co (UK) Limited | Professional & scientific | 2009 |
| Iqbal & Sons Textile Limited | Wholesale & retail | 2019 |
| Iqbal & Tipu Ltd | Wholesale & retail | 2025 |
| Iqbal Mohammed Limited | Extraterritorial | 2015 |
| Iqbal Real Estates Ltd | Real estate | 2019 |
| Iqbe Ltd | Hospitality | 2022 |
| IQI Solutions Ltd | Information & communication | 2022 |
| Iqlateral Ltd | Hospitality | 2025 |
| Iqlik Ltd | Information & communication | 2011 |
| IQM Medical Limited | Wholesale & retail | 2016 |
| Iqoncepts Limited | Information & communication | 2012 |
| Iqra Business Consultancy Ltd | Professional & scientific | 2017 |
| Iqra Business Services Ltd | Wholesale & retail | 2025 |
| Iqra Business UK Ltd | Professional & scientific | 2024 |
| Iqra Daycare and Tuition Centre Limited | Education | 2015 |
| Iqra Enterprise Limited | Construction | 2015 |
| Iqra Halal Meat Ltd | Wholesale & retail | 2022 |
| Iqra Housing & Support Limited | Hospitality | 2020 |
| Iqra Pro Ltd | Health & social care | 2020 |
| Iqra Recruitment Ltd | Administrative & support | 2024 |
| Iqra Travel Express Ltd | Administrative & support | 2025 |
| Iquad Limited | Real estate | 2019 |
| IQY Housing Ltd | Hospitality | 2022 |
| IQY Properties Ltd | Hospitality | 2023 |
| IR Homes Limited | Real estate | 2023 |
| Iradatullahi Enterprise Ltd | Administrative & support | 2017 |
| Iraga Ltd | Professional & scientific | 2013 |
| Iraqi Association for Supplementary Arabic School in the UK Ltd | Administrative & support | 2018 |
| Iregal Ltd | Construction | 2017 |
| Irei Limited | Wholesale & retail | 2023 |
| Iremote Healthcare Ltd | Health & social care | 2022 |
| Irena Genti Torra Ltd | Real estate | 2026 |
| Irene Martin Ltd | Health & social care | 2012 |
| Irene Sayce Properties Ltd | Real estate | 2017 |
| Iresa Limited | Energy | 2012 |
| Iresolve IT4SMB Ltd | Information & communication | 2018 |
| Irfan & Daughter Investments Ltd | Real estate | 2022 |
| Irfan Bhatti Ltd | Other services | 2025 |
| Irfan Jahangir Ltd | Wholesale & retail | 2026 |
| Irfan Optics Ltd | Health & social care | 2024 |
| Irfi 445 Limited | Wholesale & retail | 2026 |
| IRG Ltd | Administrative & support | 2017 |
| IRH Accountants Ltd | Professional & scientific | 2019 |
| IRH Property Ltd | Households | 2022 |
| Irha Freshway Ltd | Hospitality | 2026 |
| Iridium Group Ltd | Extraterritorial | 2023 |
| Iridium Holdings Limited | Other services | 2018 |
| Iridium Vapes Ltd | Wholesale & retail | 2025 |
| Iridum Limited | Administrative & support | 2018 |
| Irie Maid Limited | Wholesale & retail | 2023 |
| Irigit Ltd | Other services | 2016 |
| Iris Aster Wholesellers Ltd | Wholesale & retail | 2024 |
| Iris Bertz Limited | Education | 2004 |
| Iris Corporation Ltd | Extraterritorial | 2014 |
| Iris Health Ltd | Health & social care | 2025 |
| Iris Maria Ltd | Transport & logistics | 2018 |
| Irish Holdings Ltd | Hospitality | 2025 |
| IRK Properties Ltd | Real estate | 2022 |
| IRM Optical Ltd | Health & social care | 2022 |
| Irmak BBQ Dunstable Limited | Hospitality | 2018 |
| Irmakb Limited | Other services | 2023 |
| Irman Ltd | Transport & logistics | 2026 |
| Iron Aura Limited | Wholesale & retail | 2015 |
| Iron Deals Limited | Wholesale & retail | 2022 |
| Iron Force Services Ltd | Administrative & support | 2016 |
| Iron Gate Holdings Limited | Financial services | 2026 |
| Iron Gate Security Services Ltd | Administrative & support | 2025 |
| Iron Haven Supplies Ltd | Wholesale & retail | 2026 |
| Iron MAN Records Limited | Arts & recreation | 2003 |