| Intercraft Ltd | Construction | 2018 |
| Interest Free Property Investors Ltd | Real estate | 2024 |
| Interface Properties Limited | Real estate | 1996 |
| Interforce Limited | Administrative & support | 2014 |
| Interior Construction Ltd | Construction | 2007 |
| Interior Global Builders Ltd | Construction | 2019 |
| Interior Studio Ltd | Manufacturing | 2024 |
| Interiors Guru Ltd | Professional & scientific | 2020 |
| Interlet Investments Ltd | Real estate | 2025 |
| Interlink Electrical Contractors Ltd | Construction | 2026 |
| Interlink Suppliers Ltd | Wholesale & retail | 2022 |
| Internal Linings Limited | Construction | 1994 |
| International Admission Service Ltd | Professional & scientific | 2022 |
| International Aial Consulting and Evaluation Limited | Professional & scientific | 2019 |
| International Beauty Services Limited | Professional & scientific | 2024 |
| International Business and Professional Corporation | Arts & recreation | 2018 |
| International Cass Academy Ltd | Education | 2021 |
| International Compliance and Anti- Money Laundering Icas Limited | Professional & scientific | 2019 |
| International Construction Ltd | Construction | 2023 |
| International Corporate Agents (UK) LLP | | 2019 |
| International Courier Media Limited | Arts & recreation | 2023 |
| International Hospitality & Management School UK Ltd | Education | 2019 |
| International Islamic Media Foundation Ltd | Health & social care | 2008 |
| International Lawyers Association Limited | Other services | 2019 |
| International Lawyers Club UK Ltd | Other services | 2015 |
| International Legal Partners Ltd | Professional & scientific | 2009 |
| International Logistic Tasks Ltd | Transport & logistics | 2020 |
| International Metal Trading Limited | Other services | 2022 |
| International Property Services London Limited | Extraterritorial | 2013 |
| International Quality Standard for Education Ltd | Education | 2019 |
| International Scholars Reconciliation & Revolution Corporation Limited | Education | 2020 |
| International Sindhi Women Organisation (Iswo) | Health & social care | 2016 |
| International Tamils Foundation | Other services | 2019 |
| International Voice of Justice & Peace Ltd | Health & social care | 2022 |
| International Wholesale Distributors Ltd | Wholesale & retail | 2002 |
| Internationaleducationcampus Limited | Wholesale & retail | 2024 |
| Internationaltranportsolutions Ltd | Transport & logistics | 2025 |
| Internet Financial Decision Limited | Wholesale & retail | 2004 |
| Internet Info Limited | Information & communication | 2005 |
| Interpreteasy Ltd | Professional & scientific | 2025 |
| Intersentia Limited | Administrative & support | 2010 |
| Interstate Properties Limited | Real estate | 1999 |
| Interstella Developments Limited | Construction | 2017 |
| Intex Prime TEC Ltd | Wholesale & retail | 2025 |
| Intlicious Limited | Wholesale & retail | 2015 |
| Intone Cladding Ltd | Construction | 2025 |
| Intra Nova Ltd | Professional & scientific | 2025 |
| Intramedical Limited | Manufacturing | 2015 |
| Intrinsic Labs Ltd | Professional & scientific | 2020 |
| Intrinsic Solutions UK Ltd | Extraterritorial | 2015 |
| Intsof Solutions Limited | Information & communication | 2014 |
| Intuit ED Ltd | Information & communication | 2019 |
| Intuitech Security Solutions Ltd | Information & communication | 2016 |
| Inux Limited | Information & communication | 2019 |
| INV Ventures Ltd | Real estate | 2002 |
| Invate Estates Ltd | Real estate | 2020 |
| Invate Learning Solutions Ltd | Information & communication | 2021 |
| Invate Solutions Ltd | Information & communication | 2014 |
| Invent Education and Skills Academy Ltd | Professional & scientific | 2014 |
| Invent Line General Trading Limited | Wholesale & retail | 2025 |
| Inventis Electric Ltd | Manufacturing | 2022 |
| Inventory Living Ltd | Households | 2023 |
| Inventory World Limited | Administrative & support | 2007 |
| Invesmove Ltd | Real estate | 2018 |
| Invest & Inspire Ltd | Real estate | 2023 |
| Invest HK Limited | Financial services | 2018 |
| Invest TEC Holdings Ltd | Real estate | 2012 |
| Investco Homes Limited | Real estate | 2017 |
| Investify Ltd | Financial services | 2020 |
| Investment Direct Ltd | Real estate | 2025 |
| Investment Estates Limited | Real estate | 2003 |
| Investment Land (Guildford) Limited | Real estate | 2003 |
| Investment Land (U.K.) Ltd | Real estate | 2003 |
| Investment Plus Limited | Professional & scientific | 2023 |
| Investment Today Limited | Real estate | 2022 |
| Investments Generator Limited | Financial services | 2020 |
| Investments Marina REY Limited | Real estate | 2023 |
| Investments Virk Ltd | Real estate | 2019 |
| Investnest Group Ltd | Construction | 2024 |
| Investra Wealth Management Ltd | Financial services | 2025 |
| Invictus Enterprises Ltd | Arts & recreation | 2023 |
| Invictus Foods Limited | Wholesale & retail | 2018 |
| Invictus Maneo Capital Ltd | Financial services | 2019 |
| Invictus Restaurants Limited | Hospitality | 2023 |
| Invincible Solutions Limited | Information & communication | 2021 |
| Invisihost Ltd | Information & communication | 2025 |
| Invistor Ltd | Professional & scientific | 2005 |
| Invito (Gants Hill) Management Company Limited | Households | 2006 |
| Ioana Paula Ltd | Health & social care | 2015 |
| ION Tonu Ltd | Construction | 2026 |
| Iona Global Media Ltd | Information & communication | 2014 |
| Iona Realty Limited | Real estate | 2016 |
| Ionas Property Developers LLP | | 2015 |
| Ioncloud Ltd | Education | 2025 |
| Ionel Marian Ltd | Transport & logistics | 2025 |
| Ionut Anghel Moise Ltd | Construction | 2019 |
| Ionut CIS Ltd | Construction | 2023 |
| Ionutb Transport 89 Ltd | Transport & logistics | 2026 |
| Ionutlaur Ltd | Construction | 2023 |
| Iorg Ltd | Construction | 2025 |