| Impney Droitwich Ltd | Real estate | 2024 |
| Impressive Home Improvements Limited | Construction | 2018 |
| Improve Consultancy Limited | Professional & scientific | 2019 |
| Impulse Electrical (Midlands) Ltd | Construction | 2017 |
| Imrans and Khajas Ltd | Health & social care | 2020 |
| Imunir Limited | Real estate | 2024 |
| IN Exile Publishing Limited | Arts & recreation | 2007 |
| IN Time Surveying Ltd | Professional & scientific | 2013 |
| IN Tune Care Ltd | Health & social care | 2025 |
| Inayah Rashid Ltd | Construction | 2024 |
| Inbound Automation Ltd | Professional & scientific | 2026 |
| Incart Limited | Information & communication | 2014 |
| Incentives Plus Limited | Professional & scientific | 1992 |
| Inception Investments Limited | Real estate | 2016 |
| Inclusive Educate Ltd | Professional & scientific | 2020 |
| Inclusive Fashion CIC | Health & social care | 2025 |
| Inclusive Outcomes Ltd | Other services | 2026 |
| Income and Growth Limited | Extraterritorial | 2011 |
| Incremental Elephant Ltd | Information & communication | 2018 |
| Indalo Transfer Ltd | Transport & logistics | 2021 |
| Indeff UK Ltd | Information & communication | 2020 |
| Independent Boutique Ltd | Wholesale & retail | 2009 |
| Independent Hearing Care Limited | Wholesale & retail | 2017 |
| Independent Maritime Agencies Limited | Transport & logistics | 1990 |
| Independent Maritime Logistics Ltd | Transport & logistics | 2014 |
| Independent Para-Medical Services Ltd | Health & social care | 2018 |
| Independent Reworks Ltd | Administrative & support | 2004 |
| Independent-Networks Limited | Financial services | 2001 |
| Indigo Child Limited | Extraterritorial | 2015 |
| Indigo Lune Limited | Wholesale & retail | 2018 |
| Indigo Restaurant Limited | Hospitality | 2010 |
| Indigo Sky Solutions Ltd. | Manufacturing | 2013 |
| Indigo Wilson Ltd | Professional & scientific | 2022 |
| Indigodrum Limited | Other services | 2016 |
| Individual Fleet Solutions Limited | Administrative & support | 2011 |
| Indoor Climate Systems (Northern) Limited | Extraterritorial | 2010 |
| Indra Importer Ltd. | Wholesale & retail | 2003 |
| Indus Valley Advisors Ltd | Professional & scientific | 2023 |
| Indus Valley Capital Limited | Real estate | 2019 |
| Industrial & Precious Metals Limited | Manufacturing | 2006 |
| Industrial Joining Solutions Ltd | Professional & scientific | 2013 |
| Industrial Roofing Solutions (UK) Limited | Construction | 2014 |
| Infamous Records Limited | Wholesale & retail | 2018 |
| Infershift AI Solutions Limited | Information & communication | 2025 |
| Infershift Limited | Information & communication | 2025 |
| INFIN8 Finance Limited | Professional & scientific | 2024 |
| Infinigent Automation UK Ltd | Information & communication | 2015 |
| Infinite Business Performance Ltd | Administrative & support | 2025 |
| Infinite Catalog Ltd | Wholesale & retail | 2025 |
| Infinite Drive Ltd | Information & communication | 2006 |
| Infinite Solutions Ltd | Administrative & support | 2010 |
| Infinite Utilities Ltd | Professional & scientific | 2018 |
| Infinity (Loughton) Management Company Limited | Households | 2018 |
| INFINITY8 Accounting Limited | Professional & scientific | 2024 |
| Infinityquest Limited | Information & communication | 2006 |
| Infofx Limited | Administrative & support | 2008 |
| Infor (Farnborough) Limited | Information & communication | 1981 |
| Infor (Midlands II) Limited | Administrative & support | 1979 |
| Infor (Midlands IV) Limited | Information & communication | 1970 |
| Infor (Midlands) Limited | Extraterritorial | 1981 |
| Infor (Subholdings) Limited | Extraterritorial | 1999 |
| Infor (UK) Holdings Limited | Financial services | 2006 |
| Infor (United Kingdom) Limited | Information & communication | 1992 |
| Infor Global Solutions (Midlands III) Limited | Financial services | 2006 |
| Infor Global Solutions (Midlands V) Company | Extraterritorial | 1981 |
| Infor Global Solutions (Midlands VI) Limited | Financial services | 1986 |
| Infor Global Solutions Emea Holdings Limited | Financial services | 1985 |
| Infor Global Solutions UK Intermediate Holdings Limited | Financial services | 2000 |
| Infor Investments (UK) Limited | Financial services | 2021 |
| Information & Performance Services Limited | Professional & scientific | 2000 |
| Information and Performance Consulting Limited | Professional & scientific | 2012 |
| Infra Business Management Ltd | Professional & scientific | 2023 |
| Infrastructure Services Ltd | Professional & scientific | 2026 |
| Inftek Ltd | Wholesale & retail | 2017 |
| Ingeniare Building Services Consultancy Ltd | Professional & scientific | 2020 |
| Ingenious Partners Ltd | Wholesale & retail | 2021 |
| Inglis Clothes Care Ltd | Other services | 2002 |
| Ingo Power Limited | Professional & scientific | 2026 |
| Ingoldsby Court Management Company Limited | Households | 2006 |
| Ingram Roofing Services Ltd | Construction | 2024 |
| INITI8 (Solutions) Limited | Professional & scientific | 2009 |
| Initial Accident Management Services Ltd | Other services | 2009 |
| Initial Property Services Ltd | Real estate | 2018 |
| Inject to Mould Limited | Manufacturing | 2024 |
| INK Marketing Ltd | Professional & scientific | 2019 |
| Inkcali Ltd | Health & social care | 2022 |
| Inkford Meadows Ltd | Construction | 2025 |
| Inman Construction Ltd | Construction | 2017 |
| Inner Edge Coaching Limited | Administrative & support | 2024 |
| Inner Properties Limited | Real estate | 2018 |
| Inner Technology Ltd | Professional & scientific | 2023 |
| Innosonic Ltd | Information & communication | 2019 |
| INNOV8Z Limited | Professional & scientific | 2004 |
| Innovate Community Care Group Ltd | Public administration | 2025 |
| Innovateclinical Care Group CIC | Education | 2024 |
| Innovateit Hub Ltd | Information & communication | 2024 |
| Innovation and Engagement Limited | Professional & scientific | 2015 |
| Ino-Vape Limited | Wholesale & retail | 2015 |
| Inovape (Solihull) Ltd | Wholesale & retail | 2020 |
| Insell's Support Services Ltd | Health & social care | 2016 |