| Insta Asset Management Ltd | Construction | 2026 |
| Install AI Hub Ltd | Professional & scientific | 2026 |
| Installco Limited | Construction | 2016 |
| Instant Counselling Ltd | Health & social care | 2019 |
| Instante Services Ltd | Transport & logistics | 2025 |
| Instel Trading UK Ltd | Wholesale & retail | 2021 |
| Instructional Design Services Ltd | Education | 2016 |
| Insurevo Bidco Limited | Financial services | 2017 |
| Insurevo Group Limited | Financial services | 2017 |
| Insurevo Midco Limited | Financial services | 2017 |
| Insurtech Office Limited | Information & communication | 2019 |
| Intact Builders Ltd | Construction | 2022 |
| Intangible Range Ltd | Information & communication | 2012 |
| Intec Lift Services Limited | Other services | 1995 |
| Integra Global Ltd | Wholesale & retail | 2026 |
| Integraited Digital Ltd | Information & communication | 2020 |
| Integral Fire Systems Ltd | Construction | 2019 |
| Integrated Professional Services Limited | Professional & scientific | 2016 |
| Integrity & Compliance Consultants Limited | Professional & scientific | 2020 |
| Integrity Fire Solutions Ltd | Construction | 2017 |
| Integrust Consulting Ltd | Professional & scientific | 2021 |
| Integrust Security Ltd | Professional & scientific | 2022 |
| Intel Financial Solutions Ltd | Professional & scientific | 2024 |
| Intel FM Ltd | Administrative & support | 2020 |
| Intell Tax Solutions Ltd | Professional & scientific | 2026 |
| Intelligent Tech Consulting Ltd | Information & communication | 2021 |
| Intelligent Water Solutions Ltd | Construction | 2023 |
| Intellitrade Ltd | Wholesale & retail | 2019 |
| INTER1 Resources Ltd | Administrative & support | 2019 |
| Interal Ltd | Construction | 2017 |
| Interbawe Health Care Services Limited | Health & social care | 2024 |
| Intercross Networks Limited | Other services | 2005 |
| Intergarted Electrics Ltd | Construction | 2024 |
| Interior Art Design Limited | Other services | 2023 |
| Interior Designer and Furniture Limited | Wholesale & retail | 2026 |
| Interlink Africa Ltd | Wholesale & retail | 2020 |
| Interlink Distribution LLC Ltd | Wholesale & retail | 2022 |
| International Cargo Services Ltd | Transport & logistics | 2022 |
| International Financial Systems Ltd. | Information & communication | 1987 |
| International Group Service Ltd | Construction | 2019 |
| International Ministerial Alliance of Churches | Other services | 2018 |
| Interplay Creative Ltd | Professional & scientific | 2022 |
| Intexis Integrated Services Ltd | Professional & scientific | 2013 |
| Intra Logistic Solutions Ltd | Other services | 2016 |
| Intrabuild Ltd | Construction | 2013 |
| Intrada Chartering Limited | Transport & logistics | 1988 |
| Intrada Engineering Limited | Manufacturing | 1992 |
| Intraguild Ltd | Extraterritorial | 2026 |
| Intrasafe Ltd | Construction | 2025 |
| Intryst Limited | Other services | 2019 |
| Investco Marine Agency Ltd. | Administrative & support | 1992 |
| Investicom Limited | Real estate | 2024 |
| Investigo Ventures Ltd | Real estate | 2024 |
| Investinnest Properties Ltd | Real estate | 2025 |
| Investment Media Consultancy Ltd | Real estate | 2023 |
| Investrex Limited | Professional & scientific | 2019 |
| Inveup Ltd | Real estate | 2022 |
| Invis Ltd | Wholesale & retail | 2016 |
| Invismo Ltd | Financial services | 2023 |
| Inyard Construction Ltd | Construction | 2023 |
| Inzite Solutions Limited | Education | 2023 |
| Iomatics Limited | Information & communication | 2013 |
| Ionel IP Construction Ltd | Construction | 2021 |
| Ionellacare Ltd | Health & social care | 2019 |
| Ioni Papa Ltd | Transport & logistics | 2018 |
| Ionica BS Ltd | Health & social care | 2022 |
| Ionut Installation Ltd | Construction | 2019 |
| Ionutcst Construction Ltd | Construction | 2019 |
| Iovis Ltd | Financial services | 2026 |
| IP GOD & Sons Ltd | Wholesale & retail | 2020 |
| Ipexper Ltd | Households | 2019 |
| IPS Management Consultancy Ltd | Professional & scientific | 2015 |
| Ipsr Ltd | Professional & scientific | 2024 |
| Ipswich Exotics Limited | Wholesale & retail | 2023 |
| IQ Accountants & Auditors Ltd | Professional & scientific | 2016 |
| Iqbal Jeweller Limited | Wholesale & retail | 2025 |
| Iqbal Singh Training and Consultancy Ltd | Professional & scientific | 2018 |
| Iqbalecom Ltd | Wholesale & retail | 2022 |
| Iqtech Ltd | Hospitality | 2008 |
| IRA Beauty Ltd | Other services | 2025 |
| Iray Limited | Other services | 2012 |
| Iris Joinery Ltd | Construction | 2016 |
| Iris Transport Ltd | Transport & logistics | 2021 |
| Irise Group (UK) Ltd | Health & social care | 2020 |
| IRJ Interior Ltd | Construction | 2018 |
| IRO Sushi London Limited | Hospitality | 2023 |
| Ironbark Energy Advisory Ltd | Professional & scientific | 2025 |
| Ironbridge Advisory Ltd | Professional & scientific | 2026 |
| Irun Business Solutions-Chigwell Limited | Information & communication | 2009 |
| ISA Accountants Ltd | Professional & scientific | 2020 |
| Isaac Consultancy Limited | Professional & scientific | 2021 |
| Isabella Rental Properties Limited | Real estate | 2026 |
| Isadora Moon Limited | Information & communication | 2022 |
| Isanry Ltd | Real estate | 2022 |
| ISD London Ltd | Real estate | 2020 |
| Isearches Ltd | Information & communication | 2019 |
| ISHTCG1 Ltd | Manufacturing | 2026 |
| Iskren Electrical Ltd | Construction | 2021 |
| ISL Consultancy Ltd | Professional & scientific | 2024 |
| ISL Electrical Limited | Professional & scientific | 2024 |