| ILB (NO.1) Limited | Real estate | 2017 |
| Ilex Mill Residents Management Company Limited | Households | 2004 |
| Iley Foals Ltd | Agriculture & fishing | 2019 |
| Iliv Limited | Extraterritorial | 2024 |
| Illorion Limited | Wholesale & retail | 2025 |
| Illumine Psychotherapy and Counselling Ltd | Education | 2025 |
| Illys Developments Limited | Construction | 2017 |
| Illys Energy Ltd | Other services | 2010 |
| ILM Online Ltd | Wholesale & retail | 2016 |
| Ilmh Ltd | Households | 2024 |
| Ilmm AI Ltd. | Information & communication | 2024 |
| Iload Transport Ltd | Transport & logistics | 2024 |
| Ilyas (NW) Ltd | Hospitality | 2025 |
| Ilyas Patel (Accountants) Ltd | Administrative & support | 2014 |
| Ilyas Patel Ltd | Other services | 1998 |
| IM TEC Solutions Ltd | Construction | 2016 |
| Imac Building & Joinery Ltd | Construction | 2020 |
| Imacadam.Co.Uk Ltd | Construction | 2017 |
| Image Solutions (UK) Limited | Information & communication | 1997 |
| Imagine Draughting Services Limited | Professional & scientific | 2014 |
| Imagined Industries Limited | Wholesale & retail | 2026 |
| Imam Bukhari Education & Welfare Ltd | Education | 2024 |
| Iman Motors Ltd | Manufacturing | 2026 |
| Imasie Ltd | Wholesale & retail | 2025 |
| IMB Trading Ltd | Wholesale & retail | 2025 |
| IMC Banqueting Limited | Hospitality | 2024 |
| IMD Refrigeration Limited | Manufacturing | 2012 |
| Imdh Business Solutions Ltd | Professional & scientific | 2012 |
| IMF Energy Investments Ltd | Other services | 2008 |
| IMF Group Ltd | Financial services | 2021 |
| Imfo Digital Limited | Information & communication | 2025 |
| IMG Properties Ltd | Real estate | 2026 |
| Imkan Ltd | Information & communication | 2020 |
| Immensity Ltd | Wholesale & retail | 2024 |
| Immersive Landscapes Preston Ltd | Administrative & support | 2024 |
| Immigration Lawyer Limited | Professional & scientific | 2023 |
| Immytaxi Ltd | Transport & logistics | 2026 |
| Imodus Ltd | Information & communication | 2023 |
| Impact Computing & Consulting Limited | Information & communication | 2001 |
| Impact Development Ventures Ltd | Construction | 2020 |
| Impaction Ltd | Information & communication | 2023 |
| Imperative Care Ltd | Public administration | 2026 |
| Imperial Computing Services & Solutions Ltd | Information & communication | 2012 |
| Imperial Assets Limited | Real estate | 1990 |
| Imperial Barbers Ltd | Other services | 2024 |
| Imperial Estate Management Ltd | Real estate | 2022 |
| Imperial Fairway Limited | Construction | 2018 |
| Imperial Huddersfield Ltd | Real estate | 2022 |
| Imperial Relocations Ltd | Transport & logistics | 2021 |
| Imperial Relocations Management Limited | Transport & logistics | 2023 |
| Imperium (NW) Ltd | Financial services | 2019 |
| Import Export 4 U Ltd | Wholesale & retail | 2019 |
| Important Business Executive Limited | Administrative & support | 2024 |
| Impuls Kuchen GB Limited | Construction | 2024 |
| Imroze House Limited | Manufacturing | 2026 |
| IMS Properties NW Ltd | Real estate | 2025 |
| Imtiyaz Group Ltd | Education | 2024 |
| Imunchies Limited | Hospitality | 2024 |
| IMW Consultancy Ltd | Real estate | 2017 |
| IN DA Flow Ltd | Professional & scientific | 2025 |
| IN Depth Defence Ltd | Information & communication | 2024 |
| IN House Media Ltd | Professional & scientific | 2023 |
| IN My Voice Ltd | Information & communication | 2025 |
| IN the City Limited | Arts & recreation | 2008 |
| IN the EYE Media Ltd | Professional & scientific | 2021 |
| IN2GR8TED Solutions Ltd | Construction | 2007 |
| In:Libra Ltd | Hospitality | 2019 |
| Inarent Limited | Extraterritorial | 2023 |
| Inbis Consultants Limited | Administrative & support | 2017 |
| Incandescent Entertainment Ltd | Information & communication | 2025 |
| INCEPTUM2 Holdings Limited | Construction | 2012 |
| INCEPTUM2 Limited | Real estate | 2012 |
| INCEPTUM2 Services Limited | Construction | 2006 |
| Incident Free Limited | Professional & scientific | 2014 |
| Incision Estates Ltd | Real estate | 2024 |
| Incision Medical Ltd | Health & social care | 2021 |
| Incleaningandmaintenance Ltd | Administrative & support | 2025 |
| Incomeround Limited | Professional & scientific | 1988 |
| Inconceivable Films Limited | Information & communication | 1999 |
| Incorez Limited | Manufacturing | 1986 |
| Incredible Beauty Ltd | Other services | 2023 |
| Independent Asset Ltd | Education | 2020 |
| Independent Care and Training Services Ltd Limited | Administrative & support | 2016 |
| Independent Fetal Anti-Convulsant Trust | Health & social care | 2014 |
| Independent Financial Services (North West) Limited | Financial services | 2006 |
| Independent Heating & Plumbing Supplies Limited | Wholesale & retail | 2006 |
| Independent Nuclear Expertise Limited | Professional & scientific | 2018 |
| Independent Telephone Services Limited | Information & communication | 2003 |
| Independent Trader Ltd | Wholesale & retail | 2016 |
| Index Finance Limited | Real estate | 1989 |
| Index Plates Limited | Extraterritorial | 1998 |
| Indi Elle Limited | Wholesale & retail | 2021 |
| INDIA4U Ltd | Hospitality | 2025 |
| Indian Elephant Ltd | Wholesale & retail | 2017 |
| Indian Outdoor Events Limited | Hospitality | 2023 |
| Indicass Ltd | Real estate | 2021 |
| Indigo Vara Limited | Real estate | 2016 |
| Indirad Ltd. | Health & social care | 2019 |
| Indulge Desserts K Ltd | Hospitality | 2023 |
| Indus Bureau & Care Ltd | Health & social care | 2015 |