| Indiefield Ltd | Information & communication | 2008 |
| Indiefield Services Limited | Professional & scientific | 2017 |
| Indigo Pink Clothing Ltd | Wholesale & retail | 2013 |
| Indoceylon M. J. Limited | Real estate | 2005 |
| Indranie & Jerry Properties Limited | Real estate | 2020 |
| Industrial Setup Experts Ltd | Manufacturing | 2025 |
| Ineden Limited | Other services | 2010 |
| Infection Consultancy Ltd | Health & social care | 2017 |
| Inferno Design Solutions Ltd | Construction | 2026 |
| Infinisq Ltd | Hospitality | 2024 |
| Infinite Motors Limited | Wholesale & retail | 2021 |
| Infinite Prestige Ltd | Transport & logistics | 2021 |
| Infinitus Partners I LP | | 2016 |
| Infinitus Partners II LP | | 2016 |
| Infinitus Partners III LP | | 2016 |
| Infinitus Partners IV LP | | 2016 |
| Infinitus Tax Ukeig | | 2016 |
| Infinity Education Consultancy Limited | Education | 2021 |
| Infinity Partner LP | | 2016 |
| Info Group Ltd | Wholesale & retail | 2020 |
| Informagic IT Solutions Limited | Information & communication | 2010 |
| Informed Growth Ltd | Professional & scientific | 2025 |
| Infrastructure & Networks Limited | Information & communication | 2016 |
| Ingham Paper & Packaging Limited | Extraterritorial | 1989 |
| Ingiltere Tavla Koyu Sosyal Dayanisma Dernegi Community Interest Company | Education | 2018 |
| Ingledam Limited | Wholesale & retail | 2025 |
| Inham Catering Ltd | Hospitality | 2023 |
| Inhouse Property Solutions Limited | Construction | 2020 |
| Inigo Construction Ltd | Other services | 2015 |
| Initium Property Solutions Limited | Real estate | 2017 |
| INK & Insight Ltd | Information & communication | 2025 |
| Inmaterial Limited | Real estate | 2014 |
| Inner Echo Music Limited | Health & social care | 2015 |
| Inner Insights CIC | Public administration | 2022 |
| Innocent Family Homes Limited | Real estate | 2026 |
| Innovabiz Ltd | Professional & scientific | 2015 |
| Innovate Gaming Ltd | Administrative & support | 2023 |
| Innovation Professional Training Limited | Other services | 2013 |
| Innovaworks Ltd | Wholesale & retail | 2022 |
| Innovo Property Management Limited | Real estate | 2023 |
| Inout 'N' Above Ltd | Information & communication | 2018 |
| Inovista Limited | Information & communication | 2009 |
| Insatiable Meal Prep Ltd | Manufacturing | 2023 |
| Inserta Ltd | Wholesale & retail | 2024 |
| Inside Somalia Ltd | Manufacturing | 2026 |
| Insite Construction Ltd | Construction | 2024 |
| Insoftdev Ltd. | Information & communication | 2013 |
| Inspirationz Clothing Ltd | Wholesale & retail | 2024 |
| Inspire Play Space Ltd | Health & social care | 2025 |
| Inspired Happiness Limited | Other services | 2018 |
| Inspired Learning (London) LLP | | 2025 |
| Inspired Sound Limited | Arts & recreation | 2006 |
| Inspiring Dreamz Ltd | Arts & recreation | 2018 |
| Instant Makr Ltd | Wholesale & retail | 2012 |
| Instil Confidence Ltd | Administrative & support | 2024 |
| Insurvisor Ltd | Information & communication | 2014 |
| Integer Security Limited | Administrative & support | 2023 |
| Integrated Fostering Services Ltd | Health & social care | 2009 |
| Integrated Systems Solutions Ltd | Information & communication | 2024 |
| Integrity Medical Ltd | Professional & scientific | 2025 |
| Intela Electricals Ltd | Construction | 2024 |
| Inter Global Property Investments Ltd | Real estate | 2022 |
| Intercontinental Adjusters (Europe) Limited | Administrative & support | 2000 |
| Interlock Landscapes Commercial Ltd | Professional & scientific | 2023 |
| International Colin Limited | Construction | 2015 |
| International Culinary Union CIC | Hospitality | 2018 |
| International Elite Ltd | Education | 2017 |
| International Master Chefs Ltd | Hospitality | 2018 |
| International Study and Exchange Consult Ltd | Education | 2024 |
| International Toner Ltd | Wholesale & retail | 2022 |
| International Travel Group Consortium Limited | Other services | 2020 |
| Intero Design Ltd | Manufacturing | 2018 |
| Interselect Ltd | Construction | 2020 |
| Inuyaba Ltd | Health & social care | 2024 |
| Inventeco Ltd | Wholesale & retail | 2019 |
| Invest and LET Limited | Real estate | 2026 |
| Investment Building Blocks Ltd | Financial services | 2021 |
| Investment Services Limited | Professional & scientific | 1993 |
| Investor Partners I LP | | 2016 |
| Investor Partners III LP | | 2016 |
| Ioanasciuc Ltd | Construction | 2018 |
| Ionic Properties Limited | Construction | 2024 |
| IPB Motors Limited | Wholesale & retail | 2016 |
| IPK European Strategy Ltd | Administrative & support | 2014 |
| Iplm Consulting Limited | Information & communication | 2008 |
| IPM 23 Ltd | Construction | 2023 |
| IPS International Payment Systems LLP | | 2007 |
| IQM International Certification Ltd | Professional & scientific | 2024 |
| IR Active & Design Ltd | Construction | 2023 |
| IR Design & Build Ltd | Construction | 2017 |
| Irem Medi & Cons Ltd | Construction | 2016 |
| Iridium Enforcement Ltd | Administrative & support | 2016 |
| Iridium Holdings Group Ltd | Financial services | 2026 |
| Iridium Security Limited | Administrative & support | 2023 |
| Iris Electrics Ltd | Construction | 2023 |
| Iris Shot UK Ltd | Professional & scientific | 2019 |
| Irmotorbargh Ltd | Extraterritorial | 2025 |
| Ironpeak Solutions Ltd | Wholesale & retail | 2025 |
| IRP Global Cars Ltd | Wholesale & retail | 2021 |
| IRP Green Golden Garden Ltd | Wholesale & retail | 2021 |