| Improving Mehadrin Ltd | Other services | 2021 |
| Imran Traders Ltd | Wholesale & retail | 2024 |
| IN Control Debt Solutions Limited | Financial services | 2003 |
| IN Frame Studio Ltd | Arts & recreation | 2020 |
| IN Property Investments Ltd | Real estate | 2015 |
| IN the Pink Enterprises Ltd | Hospitality | 2024 |
| IN4.0 Access Limited | Professional & scientific | 2017 |
| IN4.0 ED CIC | Education | 2019 |
| IN4.0 Group Limited | Professional & scientific | 2019 |
| IN4.0 Talent Limited | Professional & scientific | 2020 |
| Inceptum PPT Limited | Real estate | 2023 |
| Incesu Limited | Wholesale & retail | 2026 |
| Inclusion ARC Ltd | Education | 2025 |
| Inclusive Digital GM CIC | Information & communication | 2026 |
| Incredible Care Services Ltd | Professional & scientific | 2023 |
| Incredibly Smart Food Limited | Wholesale & retail | 2023 |
| Independent Pharmacy Services Limited | Professional & scientific | 2013 |
| Independent Tile Agents Limited | Extraterritorial | 2009 |
| Index Associates Limited | Professional & scientific | 2024 |
| Indexideal Services Limited | Real estate | 1993 |
| Indiemenu Ltd | Information & communication | 2026 |
| Indigo BLU Apartments Ltd | Real estate | 2024 |
| Indulge Services Limited | Arts & recreation | 2018 |
| Industrial Door Company Limited | Manufacturing | 2000 |
| Ines Vieira Limited | Wholesale & retail | 2025 |
| Inevitable Ltd | Professional & scientific | 2018 |
| INF Secretariat UK Ltd. | Administrative & support | 2011 |
| Infinite Ventures Limited | Professional & scientific | 2021 |
| Infinitidreamz Ltd | Information & communication | 2014 |
| Infinity Derma Clinic Ltd | Wholesale & retail | 2020 |
| Infinity Investment Services Limited | Administrative & support | 2024 |
| Infinity Pack Ltd | Wholesale & retail | 2024 |
| Infinity Residential Services Limited | Administrative & support | 2012 |
| Information Innovation Ltd | Information & communication | 2025 |
| Ingenium IDS Limited | Information & communication | 2005 |
| Ingersley Crescent Limited | Real estate | 2016 |
| Ingersley Vale Management Company Limited | Households | 2020 |
| Ingledingle Ltd | Real estate | 2022 |
| Inhouselabs Ltd | Professional & scientific | 2026 |
| Inisa Couture & Beauty Limited | Wholesale & retail | 2025 |
| INK Guru Ltd | Wholesale & retail | 2021 |
| INK Research Limited | Professional & scientific | 2015 |
| Inked PR Limited | Professional & scientific | 2022 |
| Innerstrengthcollective Ltd | Wholesale & retail | 2025 |
| Innomotics Motors and Large Drives Limited | Manufacturing | 2022 |
| Innovation and Investment Ventures Limited | Administrative & support | 2026 |
| Innovative Concept Management Limited | Professional & scientific | 2014 |
| Innthel Care Professionals Ltd | Health & social care | 2022 |
| Inovatec (U.K) Ltd | Extraterritorial | 2018 |
| Inprada Ltd | Other services | 2025 |
| Inside Workout CIC | Information & communication | 2018 |
| Insitech Solutions Ltd | Information & communication | 2024 |
| Inspectorqr Ltd | Information & communication | 2026 |
| Inspire LAB MCR Ltd | Information & communication | 2026 |
| Inspired BEE Properties Limited | Real estate | 2025 |
| Inspired Giving Ltd | Information & communication | 2022 |
| Inspiring Homes Limited | Real estate | 2021 |
| Instamile Limited | Extraterritorial | 2016 |
| Instruct ME Limited | Education | 2025 |
| Insu Beauty Limited | Manufacturing | 2019 |
| Insurance Recruitment Services Limited | Administrative & support | 2006 |
| Insurge Ltd | Professional & scientific | 2018 |
| Intech Electrical Engineering (Manchester) Limited | | 1983 |
| INTEGR8 Cleaning Solutions Ltd | Professional & scientific | 2022 |
| INTEGR8 Construction Solutions Ltd | Construction | 2024 |
| INTEGR8 Labour Solutions Ltd | Construction | 2020 |
| INTEGR8 TM Solutions Ltd | Professional & scientific | 2021 |
| Integrated Isolutions Limited | Hospitality | 2023 |
| Integrity BIA Services Ltd | Health & social care | 2016 |
| Integrity Stainless and Alloy Ltd | Manufacturing | 2017 |
| Intek Composites Ltd | Wholesale & retail | 2025 |
| Intel Research and Development UK Limited | Other services | 2021 |
| Intelligent Business Management Solutions Limited | Wholesale & retail | 2007 |
| Intelligent Systems Control Limited | Professional & scientific | 2023 |
| Intelligently Limited | Information & communication | 2025 |
| Inter-Sports.Mcr Ltd | Arts & recreation | 2023 |
| Intercity Properties Limited | Professional & scientific | 2000 |
| International Academy of Health Care Training Ltd | Education | 2025 |
| International Netball Federation Limited | Arts & recreation | 2020 |
| Internete Ltd | Wholesale & retail | 2018 |
| Interpol Centre UN LLP | | 2026 |
| Interps Group Ltd | Wholesale & retail | 2024 |
| Into Hotels Ltd | Hospitality | 2022 |
| Intrac Property Ltd | Extraterritorial | 2020 |
| Intus Holdings Limited | Professional & scientific | 2021 |
| Intus Lettings Limited | Real estate | 2015 |
| Intuvate Limited | Professional & scientific | 2022 |
| Invatechs Limited | Professional & scientific | 2021 |
| Inverra 2 Limited | Extraterritorial | 2017 |
| Inverra Limited | Extraterritorial | 2016 |
| Investa Commercial Ltd | Financial services | 2016 |
| Investates 2 Limited | Real estate | 2026 |
| Investigations by Design Limited | Administrative & support | 2011 |
| Investment Education Ltd | Education | 1987 |
| Investment Properties UK Limited | Real estate | 2004 |
| Investments Sky Rise Ltd | Real estate | 2017 |
| Investors Centre Limited | Professional & scientific | 2025 |
| Investwood Homes Ltd | Households | 2024 |
| Invevo Limited | Information & communication | 2020 |
| Invicta Vehicle Logistics Ltd | Transport & logistics | 2025 |