| Inaya Noor Limited | Wholesale & retail | 2022 |
| Inaya Reserve Ltd | Hospitality | 2026 |
| Incair Limited | Wholesale & retail | 2010 |
| Ince Healthcare Ltd | Health & social care | 2025 |
| Inclusive Growth Consultancy Ltd | Professional & scientific | 2024 |
| Inco Healthcare Services Ltd | Health & social care | 2024 |
| Indahouse Services Ltd Ltd | Hospitality | 2022 |
| Independent Living Agency | Health & social care | 1997 |
| Index Business Supplies Limited | Wholesale & retail | 1993 |
| Indiano Pizza Dagenham Ltd | Hospitality | 2025 |
| Indiano Pizza Essex Ltd | Hospitality | 2026 |
| Indiazulu Estates Ltd | Real estate | 2017 |
| Indie Eats Limited | Hospitality | 2024 |
| Indisteel Ltd | Construction | 2022 |
| Individual Cooling Limited | Energy | 2018 |
| Individuate Ltd | Information & communication | 2025 |
| Indykwik Services Ltd | Administrative & support | 2011 |
| Indys Collections Ltd | Wholesale & retail | 2024 |
| Infant Comforts Ltd | Wholesale & retail | 2023 |
| Infinite Prog Constructions Ltd | Construction | 2022 |
| Infiniti Concierge Services Ltd | Other services | 2010 |
| Infinity Elevator Limited | Manufacturing | 2019 |
| Infinity IT & Consultancy Services Limited | Wholesale & retail | 2012 |
| Infinity Services Solutions Ltd | Wholesale & retail | 2021 |
| Info Global Learning Solutions Ltd | Professional & scientific | 2020 |
| Infolens Digital Ltd | Information & communication | 2025 |
| Information Security Consultants Limited | Information & communication | 2013 |
| Information Source Ltd | Information & communication | 2025 |
| Infosys Consult Limited | Information & communication | 2004 |
| Infotechnologiessolutions Limited | Information & communication | 2014 |
| Infotex Solutions Limited | Information & communication | 2010 |
| Infranova Group Ltd | Information & communication | 2025 |
| ING Ltd | Construction | 2006 |
| Ingdira Painting and Decorating Ltd | Administrative & support | 2018 |
| Ingenious Tech Ltd | Information & communication | 2024 |
| Ingoodhands Ltd | Construction | 2019 |
| Ingoodhands Properties Ltd | Real estate | 2020 |
| Inhouse Property Management Ltd | Real estate | 2023 |
| Inidar Care Services Ltd | Health & social care | 2026 |
| Inkrebel Ltd | Wholesale & retail | 2025 |
| Innabox Ltd | Wholesale & retail | 2012 |
| Innovai Events CIC | Health & social care | 2019 |
| Innovate House Ltd | Construction | 2020 |
| Innovatead Solutions Ltd | Professional & scientific | 2024 |
| Innovative Core Solutions Ltd | Real estate | 2016 |
| Innovative Medical Industries Ltd | Other services | 2017 |
| Innovision Solutions Ltd | Information & communication | 2024 |
| Inovic Labs Ltd. | Administrative & support | 2017 |
| Inparsec Properties (UK) Limited | Construction | 2023 |
| Inride Ltd | Other services | 2019 |
| Insight Accountex Limited | Professional & scientific | 2019 |
| Insight Training & Employment Limited | Education | 2014 |
| Insitu Pharma Health Data Solutions Limited | Information & communication | 2025 |
| Inspire Ventures Limited | Real estate | 2025 |
| Inspiren Global Ltd | Wholesale & retail | 2019 |
| Install Electrical Connect Limited | Construction | 2016 |
| Instantech Limited | Information & communication | 2020 |
| Instareturns Ltd | Information & communication | 2022 |
| Insure Restore Services Ltd | Administrative & support | 2026 |
| Integer Asset Management Limited | Real estate | 2024 |
| Integrated Bros Ltd | Health & social care | 2020 |
| Integrated Contracting Ltd | Manufacturing | 2026 |
| Integrated Practical Business Training Ltd | Education | 2005 |
| Integrated Support Home CIC | Professional & scientific | 2025 |
| Intellectrax Ltd | Education | 2025 |
| Intelli Holdings Limited | Professional & scientific | 2025 |
| Intellibooks Limited | Professional & scientific | 2025 |
| Inter Dimensional Ltd | Wholesale & retail | 2025 |
| Intercession Ministry | Other services | 2012 |
| Intercredible Care Ltd | Health & social care | 2018 |
| Interesting Combination One Ltd | Transport & logistics | 2016 |
| Interior Bratianu Construct Ltd | Construction | 2019 |
| Intermode Limited | Manufacturing | 1997 |
| International Faqeer Ltd | Wholesale & retail | 2025 |
| International Lines Ltd | Wholesale & retail | 2025 |
| International Trading & Commerce Limited | Wholesale & retail | 2022 |
| Interpower Equipments Limited | Manufacturing | 2026 |
| Interre Concepts Ltd | Education | 2023 |
| Interweiv Limited | Administrative & support | 2025 |
| Intex Professionals Ltd | Health & social care | 2024 |
| Intexx Group Ltd | Construction | 2021 |
| Intotheopen Ltd | Information & communication | 2025 |
| Intra Management Limited | Construction | 2023 |
| Intraling Limited | Wholesale & retail | 2023 |
| Investek Limited | Real estate | 2016 |
| Investment Gusttydo Ltd | Construction | 2024 |
| Inyotta Analytica Ltd | Information & communication | 2024 |
| Ioan KUN Decorating Ltd | Construction | 2021 |
| Iolanda Pereira Ltd | Professional & scientific | 2024 |
| ION Buraga Construction Ltd | Construction | 2026 |
| ION Capital Development Ltd | Construction | 2025 |
| ION Cepalov Ltd | Manufacturing | 2023 |
| ION Lazar Ltd | Construction | 2021 |
| Ionas Building Ltd | Construction | 2025 |
| Ionas Construction Ltd | Construction | 2017 |
| Ionas T Ltd | Construction | 2016 |
| Ionel Tanasa Ltd | Construction | 2014 |
| Iosa Freight Limited | Transport & logistics | 1999 |
| Iosiv Cleaning Limited | Construction | 2025 |
| Ipas Accounting Ltd | Professional & scientific | 2022 |