| Incrementum Property Partners Ltd | Real estate | 2020 |
| Indeed Trading Group Ltd | Administrative & support | 2011 |
| India Export and Imports Limited | Wholesale & retail | 2024 |
| Indian Drip Ltd | Wholesale & retail | 2025 |
| Indian Palace Bedfont Ltd | Hospitality | 2022 |
| Indian Performing Arts Club Ltd | Arts & recreation | 2022 |
| Indica Technology Ltd | Information & communication | 2021 |
| Indra DEV IT Labs Ltd | Information & communication | 2017 |
| Indulj Ltd | Administrative & support | 2022 |
| Industryfront Ltd | Information & communication | 2024 |
| Infinicargo Limited | Transport & logistics | 2025 |
| Infinity Business Limited | Information & communication | 2018 |
| Infinity Capital Ltd | Administrative & support | 2022 |
| Infinity Connect Services Ltd | Professional & scientific | 2026 |
| Infinity Medical Innovations Ltd | Manufacturing | 2022 |
| Infinity Translation & Marketing Services Ltd | Professional & scientific | 2014 |
| Infosense Limited | Information & communication | 2018 |
| Infotech Web Technologies Limited | Information & communication | 2015 |
| Infratek One Ltd | Manufacturing | 2026 |
| Ingwe Health Care Limited | Health & social care | 2022 |
| Inix Solutions Ltd | Information & communication | 2021 |
| Innovaptive Solutions Limited | Information & communication | 2024 |
| Innovative Skills UK Limited | Administrative & support | 2020 |
| Innovative Studio Ltd | Manufacturing | 2025 |
| Innovosol Limited | Wholesale & retail | 2026 |
| Inperta Technologies Limited | Information & communication | 2009 |
| Insight Crux Consulting Ltd | Information & communication | 2019 |
| Inspired Highfliers Limited | Health & social care | 2014 |
| Inspired Youth Ltd | Health & social care | 2024 |
| Install IT Right Ltd | Construction | 2025 |
| Integral Management Consultants Limited | Construction | 2002 |
| Integrated Design Limited | Manufacturing | 1985 |
| Integrated Hospitality Solutions Ltd | Administrative & support | 2014 |
| Intellify Technologies Ltd | Information & communication | 2024 |
| Intelligent Children Craft UK Limited | Education | 2025 |
| Intelligent Home Solutions Ltd | Real estate | 2007 |
| Intellitech DEV OPS Limited | Information & communication | 2024 |
| Interconnect Supplies Ltd | Wholesale & retail | 2024 |
| Interken Freighters (U.K.) Limited | Transport & logistics | 1984 |
| International Fashion Paradise Ltd | Wholesale & retail | 2020 |
| International Islamic Marketing Association | Professional & scientific | 2010 |
| International Nepalese Chefs Society Limited | Other services | 2020 |
| International Strategies Group Ltd | Other services | 2024 |
| Intexim Crafts Ltd | Extraterritorial | 2010 |
| Inulettings Ltd | Real estate | 2025 |
| Invest Team Limited | Information & communication | 2011 |
| Investateuk C.I.C. | Administrative & support | 2025 |
| Invigor Solutions Limited | Information & communication | 2015 |
| Ions Services Ltd | Transport & logistics | 2021 |
| IPE Arcadia Street Limited | Real estate | 2019 |
| IPE Bickley Road Limited | Real estate | 2018 |
| IPE Calm Homes Solihull 2 Limited | Real estate | 2020 |
| IPE Calm Homes Solihull 3 Limited | Real estate | 2021 |
| IPE Calm Homes Solihull Limited | Real estate | 2018 |
| IPE Church Path Limited | Real estate | 2016 |
| IPE Construction Limited | Construction | 2017 |
| IPE Creekside Limited | Real estate | 2017 |
| IPE Hanwell Limited | Real estate | 2018 |
| IPE Harlow Limited | Real estate | 2016 |
| IPE Merchant Street Limited | Real estate | 2019 |
| IPE Radlett Close Limited | Real estate | 2019 |
| IPE Tanner Street Limited | Real estate | 2017 |
| IPE Wood Street Limited | Real estate | 2017 |
| IQ Plumbing & Heating Services Ltd | Construction | 2016 |
| Iqra Academics Ltd | Education | 2024 |
| Iqra Hassan DIN Ltd | Wholesale & retail | 2025 |
| Iris Transportation Limited | Transport & logistics | 2024 |
| Iron FOX Limited | Information & communication | 2013 |
| Iron Shield Roofing Ltd | Construction | 2026 |
| Irvine Soloutions Ltd | Construction | 2025 |
| Iryna Ltd | Construction | 2019 |
| Isabel Nova Ltd | Hospitality | 2025 |
| ISG Consultancy Limited | Professional & scientific | 2013 |
| ISH Services Ltd | Other services | 2025 |
| Ishaani Infotech Ltd | Information & communication | 2011 |
| Ishara Investment Ltd | Real estate | 2016 |
| Isher Energy Limited | Construction | 2025 |
| Ishu and IRA Investments Limited | Real estate | 2026 |
| Ishu Food and Wine Limited | Wholesale & retail | 2013 |
| Istanbul International Ltd | Wholesale & retail | 2026 |
| IT Tech Fusion Limited | Information & communication | 2024 |
| IT YNR Limited | Administrative & support | 2016 |
| Iting Consultancy Ltd | Information & communication | 2012 |
| Ittia.Ai Limited | Information & communication | 2025 |
| It’S a Phone Shop Limited | Information & communication | 2022 |
| IVELIN2007 Ltd | Administrative & support | 2023 |
| Iverifi Ltd | Information & communication | 2023 |
| Ixen Design & Engineering Limited | Professional & scientific | 2026 |
| J Maan Limited | Construction | 2016 |
| J Traylen Ltd | Manufacturing | 2025 |
| J&D Trans Ltd | Transport & logistics | 2018 |
| J&F Electron Ltd | Construction | 2026 |
| J&H Cool Air Ltd | Construction | 2019 |
| J&J Home Solutions Limited | Construction | 2026 |
| J&J International Trade Ltd | Wholesale & retail | 2024 |
| J&J Interpreters Limited | Information & communication | 2017 |
| J&K Scaffolding Ltd | Construction | 2025 |
| J&K Yori Ltd | Hospitality | 2026 |
| J&Paul Construction Ltd | Construction | 2024 |
| J&Z Enterprise Ltd | Construction | 2023 |