| Hybrid Plant Services Ltd | Construction | 2014 |
| Hybrid Property Management Ltd | Real estate | 2025 |
| Hyderabad House Limited | Extraterritorial | 2021 |
| Hydra Logistics Ltd | Professional & scientific | 2023 |
| Hypervizorsolutions Limited | Information & communication | 2011 |
| Høle Records Ltd | Professional & scientific | 2025 |
| I & G Construction Ltd | Construction | 2010 |
| I Build Technical Services UK Ltd | Construction | 2021 |
| I Care Pharma Limited | Extraterritorial | 2016 |
| I D Design Limited | Information & communication | 2000 |
| I3S Advisory Limited | Wholesale & retail | 2025 |
| Iach Consulting Limited | Professional & scientific | 2011 |
| IAN Parker Consulting Limited | Professional & scientific | 2013 |
| IB Real Estate Advisory Ltd | Real estate | 2025 |
| Ichnos Publishing House Ltd | Wholesale & retail | 2020 |
| ICO Inc Limited | Professional & scientific | 1995 |
| Icon Global Properties Ltd. | Real estate | 2013 |
| Icon Global Services Ltd | Wholesale & retail | 2007 |
| Icon Global Services Trading Ltd | Real estate | 2021 |
| Icss Consultant Ltd | Professional & scientific | 2021 |
| Ideal Decorative Solutions Ltd | Construction | 2019 |
| Ideal Plastic Works Ltd | Wholesale & retail | 2021 |
| Ideal Space Global Limited | Construction | 2022 |
| Ideis Ltd | Wholesale & retail | 2024 |
| Idyam Solutions Limited | Information & communication | 2014 |
| Ifka Consulting Limited | Information & communication | 2023 |
| IJD Process Technologies Limited | Information & communication | 2003 |
| Ikarian Motors Ltd | Wholesale & retail | 2023 |
| IKD Projects Ltd | Extraterritorial | 2020 |
| Ikigai Films Limited | Information & communication | 2016 |
| Illustrious Interiors Ltd | Construction | 2017 |
| IM Verified Cars Limited | Wholesale & retail | 2023 |
| IMEDIA8 Limited | Information & communication | 2001 |
| IMMBOON111 Ltd | Hospitality | 2023 |
| Immohite Limited | Information & communication | 2015 |
| Imperial Property (Marble) Ltd | Real estate | 2025 |
| Imperial Stone Group Ltd | Wholesale & retail | 2017 |
| Imperialfix Ltd | Construction | 2024 |
| Impressco Limited | Administrative & support | 2004 |
| Improper Agency Limited | Professional & scientific | 2019 |
| Imran Air Install Ltd | Construction | 2026 |
| Imre Haraszti Ltd | Information & communication | 2014 |
| IN Focus Public Networks Limited | Professional & scientific | 2008 |
| Inar Contractors Ltd | Construction | 2021 |
| Inavater Group Limited | Extraterritorial | 2020 |
| Independent Cement Consultants Limited | Professional & scientific | 2006 |
| Indiacast UK Ltd | Information & communication | 2013 |
| Indian Grocery Online Limited | Wholesale & retail | 2022 |
| Indigo Hermitage Ltd | Professional & scientific | 2023 |
| Industrias E Comercio DE Calcado UK Limited | Wholesale & retail | 2024 |
| Infinett Technology Solutions Limited | Information & communication | 2016 |
| Infinity Media Group Limited | Financial services | 2017 |
| Infinity Media Holdings Limited | Financial services | 2021 |
| Infinity Properties Lettings and Management Limited | Transport & logistics | 2018 |
| Infosight Consulting Limited | Information & communication | 2026 |
| Infosight Properties Ltd | Real estate | 2015 |
| Innofascia Ltd | Manufacturing | 2025 |
| Innovates AI Ltd | Information & communication | 2025 |
| Innoventive Property Services Limited | Administrative & support | 2004 |
| Innspace UK Ltd | Information & communication | 2023 |
| Inoventive Design Ltd | Professional & scientific | 2019 |
| Inovex Simulation & Training UK Limited | Information & communication | 2019 |
| Inspire Design & Build (London) Limited | Manufacturing | 2022 |
| Inspire Marine Ltd | Manufacturing | 2023 |
| Inspire Systems Ltd | Construction | 2018 |
| Inspired Stays Limited | Households | 2019 |
| Inspíra Global Ltd | Professional & scientific | 2020 |
| Instatech Global Ltd | Information & communication | 2019 |
| INT RE Consult Ltd | Real estate | 2022 |
| Integrated Healthcare Partnership Limited | Administrative & support | 2013 |
| Intellectual Security Group Limited | Administrative & support | 2017 |
| Intellectual Training Ltd | Education | 2026 |
| Intelliaai Ltd | Information & communication | 2024 |
| Intelligent Resourcing Solutions Ltd | Information & communication | 2023 |
| Inter Company Formations.Com Ltd | Professional & scientific | 2010 |
| Interacted Ltd | Education | 2024 |
| Interestless Limited | Financial services | 2018 |
| Interior Art Craft Ltd | Manufacturing | 2025 |
| International Brazilian Petroleum UK Ltd | Energy | 2021 |
| International Business Square Limited | Wholesale & retail | 2020 |
| Into the Mystic Production Ltd | Information & communication | 2024 |
| Intracs General Trading Ltd | Information & communication | 2022 |
| Intuitive Audio Limited | Information & communication | 2017 |
| Inventic Systems Inc Limited | Information & communication | 2018 |
| Investilo Analytics Limited | Information & communication | 2025 |
| Investors in Ideas Ltd | Professional & scientific | 2010 |
| Invictus Techno Solutions Limited | Information & communication | 2022 |
| Inyun Ltd | Hospitality | 2025 |
| Iopt Events Limited | Health & social care | 2009 |
| Ipro Suite Limited | Professional & scientific | 2023 |
| Ironpeak Advisory Ltd | Administrative & support | 2025 |
| ISB Global Limited | Professional & scientific | 1999 |
| ISB Global Secretaries Limited | Professional & scientific | 2002 |
| ISB Visions Limited | Professional & scientific | 2002 |
| Ishchenko Property Development Ltd | Real estate | 2024 |
| ISI Broadcast Limited | Professional & scientific | 2023 |
| Islander CC Limited | Manufacturing | 2025 |
| Issa Home Design Ltd | Professional & scientific | 2022 |
| IT Microtech Ltd | Information & communication | 2024 |
| Italy Trade Limited | Wholesale & retail | 2008 |