| Inbridge Resources Ltd | Wholesale & retail | 2025 |
| Inc Ltd | Real estate | 2021 |
| Inc Nation CIC | Administrative & support | 2021 |
| Incentivesmart Limited | Administrative & support | 2008 |
| Inception Property Services Ltd | Real estate | 2019 |
| Incl.Usiveinc Limited | Wholesale & retail | 2023 |
| Incline Care Ltd | Health & social care | 2025 |
| Inclusilingua Ltd | Other services | 2023 |
| Inclusive Active Ltd | Education | 2026 |
| Inclusive Farm Bedford. CIC | Administrative & support | 2024 |
| Inclusive Farm Ltd | Wholesale & retail | 2021 |
| Inclusivitwee Ltd | Professional & scientific | 2019 |
| Income Fanatics Ltd | Financial services | 2021 |
| Incopa Limited | Professional & scientific | 2004 |
| Inctabletplus Ltd | Manufacturing | 2019 |
| Incubed Limited | Professional & scientific | 2009 |
| Independent Financial Matters Ltd | Financial services | 2011 |
| Independent Financial Planning (Anglia) Ltd | Financial services | 2005 |
| Independent Living Support, MK Limited | Health & social care | 2026 |
| Independent Resourcing Consultancy Limited | Administrative & support | 2018 |
| Independent Support for Families Ltd | Health & social care | 2025 |
| Indepth Consulting Services Ltd | Real estate | 2018 |
| Inderflame Holdings Limited | Administrative & support | 2012 |
| INDF1 (Lawshouse) LLP | | 2023 |
| INDF1 Investments Limited | Construction | 2021 |
| INDF3 Investments Limited | Construction | 2022 |
| INDF4 (Burwash) Limited | Real estate | 2025 |
| INDF4 Investments Limited | Construction | 2022 |
| INDF5 Investments Limited | Construction | 2023 |
| INDF7 Investments Limited | Construction | 2026 |
| India Haat Limited | Wholesale & retail | 2023 |
| Indian Chef Ltd | Manufacturing | 2024 |
| Indian Curry House MK Ltd | Hospitality | 2020 |
| Indian Lodge Restaurant Ltd | Hospitality | 2018 |
| Indiecore Studios Ltd | Information & communication | 2026 |
| Indigo Media Group Ltd | Wholesale & retail | 2025 |
| Indigo Recordings Limited | Information & communication | 1994 |
| Indigo Wire Ltd | Construction | 2022 |
| Indimart Food & Beverages Limited | Wholesale & retail | 2022 |
| Indimart Group Limited | Wholesale & retail | 2019 |
| Indixta BSS Limited | Professional & scientific | 2022 |
| Indo-British Films Limited | Information & communication | 1960 |
| Indome Capital Limited | Construction | 2022 |
| Indome Holdings Limited | Construction | 2021 |
| Indome Investment Management Limited | Professional & scientific | 2023 |
| Indome Investments Limited | Financial services | 2022 |
| Indome Limited | Financial services | 2012 |
| Indoor Climate Systems (UK) Limited | Administrative & support | 2002 |
| Indoorarchery Limited | Arts & recreation | 2017 |
| Inds Motors Ltd | Wholesale & retail | 2025 |
| Indus Motors Ltd | Wholesale & retail | 2018 |
| Induslabs Limited | Information & communication | 2021 |
| Indusri Consulting Services Limited | Information & communication | 2012 |
| Industrial Base Limited | Wholesale & retail | 2015 |
| Industrial Belt Drives Limited | Manufacturing | 2023 |
| Industrial Facilities Limited | Manufacturing | 2014 |
| Industrial Machine Services Ltd | Manufacturing | 2003 |
| Industrial Microwave Systems Limited | Manufacturing | 2001 |
| Industrial Optimizers (UK) Limited | Professional & scientific | 1999 |
| Industrial Robotic Solutions Ltd | Professional & scientific | 2018 |
| Industrialize UK Ltd | Manufacturing | 2016 |
| Industrious Recruitment Limited | Administrative & support | 2013 |
| Indygo Chiropractic Limited | Health & social care | 2018 |
| Indysoft Europe Limited | Administrative & support | 2004 |
| Inet Services Limited | Information & communication | 2021 |
| Inexotech Limited | Information & communication | 2022 |
| Infalliblex Limited | Information & communication | 2023 |
| Inferential Control Limited | Professional & scientific | 2017 |
| Infinate Limited | Health & social care | 2012 |
| Infinite Care Medical Services Ltd | Health & social care | 2025 |
| Infinite Drivers Solutions Ltd | Transport & logistics | 2018 |
| Infinite Mystic Ltd | Other services | 2020 |
| Infinite Networks Limited | Wholesale & retail | 2023 |
| Infinite PI Holdings Ltd | Other services | 2018 |
| Infinite PI Ltd | Information & communication | 2015 |
| Infinite Security and Logistics Ltd | Transport & logistics | 2026 |
| Infinite Windows & Doors Ltd | Wholesale & retail | 2011 |
| Infinitepi Investments Ltd | Real estate | 2017 |
| Infiniti Flooring Ltd | Other services | 2018 |
| Infiniti Information Systems Limited | Information & communication | 2019 |
| Infiniti Integration Ltd | Construction | 2019 |
| Infiniti Systems Ltd | Real estate | 2003 |
| Infinitive Resources Limited | Administrative & support | 2024 |
| Infinity Commerce Group Limited | Information & communication | 2024 |
| Infinity Cuisine Ltd | Hospitality | 2024 |
| Infinity Imaging Ltd | Health & social care | 2022 |
| Infinity Joinery Limited | Manufacturing | 2013 |
| Infinity Payroll Solutions Limited | Administrative & support | 2019 |
| Infinity Realty and Investments Ltd | Real estate | 2022 |
| Infinity Rhythmz Ltd | Arts & recreation | 2025 |
| Infinity Tracking Limited | Information & communication | 2010 |
| Inflecta Ltd | Professional & scientific | 2025 |
| Inflecto Digital Limited | Information & communication | 2018 |
| Info Tranzit Ltd | Transport & logistics | 2018 |
| Infobyte Solutions Ltd | Information & communication | 2026 |
| Infomore Ltd | Information & communication | 2007 |
| Infoobjects Limited | Information & communication | 2008 |
| Inforeach Technologies Limited | Information & communication | 2014 |
| Inforeva Limited | Information & communication | 2010 |
| Information Control and Planning Limited | Wholesale & retail | 2015 |