| Image Capture Limited | Professional & scientific | 2012 |
| Image Expressions Ltd | Professional & scientific | 2024 |
| Imaginaut AI Limited | Wholesale & retail | 2025 |
| Imagine Technology Ltd | Information & communication | 2018 |
| Imakdynamic UK Limited | Wholesale & retail | 2008 |
| IMD People Ltd | Administrative & support | 2023 |
| Imex Transport Ltd | Transport & logistics | 2019 |
| Imijs Ltd | Information & communication | 2026 |
| Imjo Consultants Limited | Professional & scientific | 2026 |
| Immigration Advice Service Ltd | Professional & scientific | 2011 |
| Immigration Solutions Centre Ltd | Other services | 2022 |
| Immitis Ltd | Wholesale & retail | 2025 |
| Immortal Fitness Studios Ltd | Arts & recreation | 2018 |
| Impact BD Ltd | Professional & scientific | 2026 |
| Imperial Manchester Limited | Wholesale & retail | 2012 |
| Imperial Properties (Manchester) Ltd | Real estate | 2019 |
| Imperial Strength Limited | Wholesale & retail | 2026 |
| Imperium Goods Ltd | Wholesale & retail | 2025 |
| Imperium Property Building & Construction Ltd | Construction | 2025 |
| Impervian Ltd | Information & communication | 2025 |
| Improvenergy Solutions Ltd | Construction | 2022 |
| IMS Construction Nationwide Ltd | Construction | 2019 |
| IMS Technologies Ltd | Information & communication | 2021 |
| Imsi Group Ltd | Other services | 2018 |
| Imtf International Ltd | Education | 2019 |
| IMW Logistics and Services Limited | Transport & logistics | 2023 |
| IN the Rave Limited | Information & communication | 2023 |
| IN the Vault Cuts Ltd | Other services | 2025 |
| IN4 Marketing Services Ltd | Manufacturing | 2006 |
| Inaaraco Limited | Professional & scientific | 2025 |
| Inaaya Solicitors Limited | Professional & scientific | 2016 |
| Inayah Curry House Ltd | Hospitality | 2025 |
| Inbtwin CIC | Information & communication | 2024 |
| Inclusive Bytes C.I.C. | Information & communication | 2023 |
| Inclusive Group Limited | Professional & scientific | 2004 |
| Inclusive Limited | Extraterritorial | 2003 |
| Incondite Media Ltd | Professional & scientific | 2001 |
| Incowear Ltd | Manufacturing | 2018 |
| Indara NW Ltd | Administrative & support | 2026 |
| Indeed Ltd | Construction | 2022 |
| Indelible Consultancy Limited | Professional & scientific | 2020 |
| Independent Financial Advice Ltd | Financial services | 2014 |
| Independent Housing Limited | Health & social care | 2005 |
| Independent Professorial Security Limited | Administrative & support | 2020 |
| Indian Delicacies Ltd | Hospitality | 2025 |
| Indian Ocean Westwood Limited | Hospitality | 2014 |
| Indian Urus Ltd | Hospitality | 2021 |
| Indigo Coffee Project Ltd | Manufacturing | 2024 |
| Indinaz Limited | Hospitality | 2026 |
| Individual Pathways Limited | Health & social care | 2020 |
| Induco Partners Limited | Information & communication | 2025 |
| Induja Holidays Ltd | Real estate | 2019 |
| Industrial Cleaning Solutions Limited | Other services | 2008 |
| Indygen Limited | Energy | 2015 |
| Indygen Utility Ltd | Professional & scientific | 2016 |
| INEED4 Ltd | Professional & scientific | 2025 |
| Inferno Building Solutions Ltd | Construction | 2024 |
| Inferno Property Solutions Ltd | Real estate | 2026 |
| Inferno Solutions Ltd | Manufacturing | 2024 |
| Infinite Engineers Limited | Hospitality | 2024 |
| Infinity Computing (Saddleworth) Limited | Information & communication | 2013 |
| Infinity Contracting Services Ltd | Construction | 2025 |
| Infinity Locum Ltd | Wholesale & retail | 2022 |
| Infinity Management Group Ltd | Real estate | 2024 |
| Infinity Services & Supplies Limited | Wholesale & retail | 2024 |
| Infinity Sports Project Limited | Wholesale & retail | 2020 |
| Infinivo Ltd | Transport & logistics | 2024 |
| Infinix Solutions Limited | Transport & logistics | 2024 |
| Infoshot Limited | Information & communication | 2000 |
| Infrastructure Consultants Ltd | Professional & scientific | 2026 |
| Ingress Abbey Events Limited | Information & communication | 2009 |
| Inhouse Carpets and Vinyls Limited | Construction | 2012 |
| Inhouse Technology Limited | Information & communication | 2006 |
| Inish Investments Limited | Administrative & support | 2017 |
| INK Properties Ltd | Real estate | 2002 |
| Inneed Human Support Ltd | Health & social care | 2025 |
| Inner Circle Training Limited | Administrative & support | 2010 |
| Inningsedge Managemet Limited | Arts & recreation | 2025 |
| Innofusionai Ltd | Information & communication | 2025 |
| Innopeak Limited | Construction | 2023 |
| INNOV8CYBER Limited | Information & communication | 2024 |
| Innova Holdings NW Limited | Financial services | 2023 |
| Innovatic Ltd. | Information & communication | 2024 |
| Innovation Consult Ltd. | Extraterritorial | 2024 |
| Innovation Smart Ltd | Construction | 2018 |
| Innovative Technology Limited | Professional & scientific | 1985 |
| Insc Consulting Ltd | Financial services | 2018 |
| Inservicblog Ltd | Wholesale & retail | 2025 |
| Insight Psychological Therapy Ltd | Other services | 2026 |
| Inspecta Gadget Limited | Other services | 2017 |
| Inspecta Limited | Construction | 2002 |
| Inspiration (Manchester) Limited | Other services | 2008 |
| Inspire CC Ltd | Education | 2026 |
| Inspire Commercial Services Ltd Ltd | Manufacturing | 2020 |
| Inspire Door Systems Ltd | Administrative & support | 2021 |
| Inspire Excellence UK Limited | Administrative & support | 2018 |
| Inspire Invest Properties Ltd | Construction | 2025 |
| Inspire Style Ltd | Wholesale & retail | 2024 |
| Inspire Training Academy Limited | Other services | 2023 |
| Inspiring Education Limited | Education | 2018 |