| Innovics Technologies Limited | Information & communication | 2018 |
| Innozac Ltd | Wholesale & retail | 2022 |
| Innventory Limited | Professional & scientific | 2011 |
| INO Services Ltd | Administrative & support | 2025 |
| Inpack Limited | Administrative & support | 2017 |
| Insane Brands Ltd | Wholesale & retail | 2021 |
| Inscope Electrical Limited | Construction | 2018 |
| Insecr Ltd | Professional & scientific | 2025 |
| Insha Travel Ltd | Other services | 2018 |
| Inside OUT Toys Limited | Wholesale & retail | 2012 |
| Inside Track (Employment) Community Interest Company | Administrative & support | 2008 |
| Inside Trading Ltd | Wholesale & retail | 2021 |
| Insider Tech Ltd | Wholesale & retail | 2026 |
| Insight Business Solutions Finance and Accountancy Services Limited | Professional & scientific | 2017 |
| Insight Embedded Consulting Limited | Information & communication | 2020 |
| Insight Guru Ltd | Professional & scientific | 2024 |
| Insight Learning Services Ltd | Professional & scientific | 2025 |
| Insightreg Consultancy Limited | Professional & scientific | 2025 |
| Insignia Signs and Display (UK) Ltd | Professional & scientific | 2019 |
| Insolvency Experts Ltd | Information & communication | 2019 |
| Inson Legal Limited | Professional & scientific | 2024 |
| Inspecton Limited | Water & waste | 2014 |
| Inspire Bolton Limited | Wholesale & retail | 2015 |
| Inspire Works Consulting Ltd | Professional & scientific | 2026 |
| Inspired by ISY Ltd | Wholesale & retail | 2025 |
| Inspired Corporate Limited | Wholesale & retail | 2021 |
| Inspired Outings Limited | Education | 2021 |
| Inspired Scents Ltd | Wholesale & retail | 2026 |
| Inspiring Excellence Ltd | Information & communication | 2018 |
| Inspiring Learning Services Limited | Professional & scientific | 2008 |
| Insta Fill Ltd | Wholesale & retail | 2023 |
| Instant Parcel Force Ltd | Other services | 2016 |
| Instantcream Limited | Wholesale & retail | 2021 |
| Instantfundingsolutions Limited | Construction | 2019 |
| Instantic Global Limited | Construction | 2023 |
| Instore Optician Limited | Wholesale & retail | 2014 |
| Insurance Matters Limited | Financial services | 1986 |
| Insync Media Limited | Administrative & support | 2018 |
| Insync Personal Training Limited | Arts & recreation | 2015 |
| INT8 Limited | Professional & scientific | 2023 |
| Intalytic Limited | Professional & scientific | 2026 |
| Intangible Services UK Limited | Information & communication | 2021 |
| Intec Solutions Ltd | Information & communication | 2024 |
| Intech Limited | Information & communication | 1980 |
| Intech World Ltd | Wholesale & retail | 2022 |
| Integer Accountancy Services Ltd. | Professional & scientific | 2016 |
| Integra People Limited | Administrative & support | 2008 |
| Integrated Facilities Management Bolton Limited | Administrative & support | 2016 |
| Integrity Cars Ltd | Wholesale & retail | 2023 |
| Integrity Church (Meistad) Limited | Other services | 2022 |
| Integrity Claims Ltd | Administrative & support | 2026 |
| Integrity Lettings Ltd | Real estate | 2021 |
| Integrity Management Holdings Ltd | Real estate | 2026 |
| Integrity Management Software Ltd | Information & communication | 2003 |
| Integrity Travel Ltd | Administrative & support | 2026 |
| Intelia Consulting Ltd | Professional & scientific | 2011 |
| Intelipad Limited | Professional & scientific | 2005 |
| Intelisurf Limited | Information & communication | 2022 |
| Intellectuahly Limited | Professional & scientific | 2026 |
| Intelligent Compliance Service Limited | Professional & scientific | 2016 |
| Intelligent Compliance Solutions Limited | Professional & scientific | 2020 |
| Intelligent Environment Security Ltd | Administrative & support | 2024 |
| Intelligent Environmental Services Ltd | Professional & scientific | 2019 |
| Intelligent Property Investments Limited | Real estate | 2003 |
| Intelligent Publishing Limited | Information & communication | 2026 |
| Intelligent Testing Limited | Professional & scientific | 2023 |
| Intelligent Tracing Ltd | Information & communication | 2010 |
| Intelligent Utilities and Training Limited | Education | 2021 |
| Intelligent Vehicle Transportation Ltd | Transport & logistics | 2024 |
| Intellitec M V Ltd. | Manufacturing | 1997 |
| Intense Pulse Limited | Administrative & support | 2011 |
| Inter-Hiring Limited | Professional & scientific | 2025 |
| Interafcon Limited | Mining & quarrying | 2017 |
| Interclean Southern Limited | Administrative & support | 2005 |
| Interconnect Technologies Ltd | Professional & scientific | 2024 |
| Interdental Ltd | Health & social care | 2022 |
| Interestpro Consultancy Limited | Professional & scientific | 2023 |
| Intergold Services Ltd | Professional & scientific | 2006 |
| Interiora Projects Limited | Administrative & support | 2017 |
| Interlet Developments Ltd | Real estate | 2021 |
| Interlink Ventures Ltd | Wholesale & retail | 2024 |
| Interloft Conversions Limited | Construction | 2010 |
| Intermart International Limited | Wholesale & retail | 1998 |
| Internal Drywall Solutions Limited | Construction | 2012 |
| International & Store Limited | Wholesale & retail | 2025 |
| International Academy for Leadership and Socio-Economic Development Ltd | Education | 2026 |
| International Business Products Ltd | Construction | 2001 |
| International Goods Research Limited | Wholesale & retail | 2026 |
| International Health Consultancy Group Ltd | Professional & scientific | 2021 |
| International Netball Roadshow Limited | Arts & recreation | 2009 |
| International Tickets Ltd | Administrative & support | 2017 |
| Internet Solutions Services Limited | Professional & scientific | 2006 |
| Interop Limited | Administrative & support | 2017 |
| Interstellar Properties Limited | Real estate | 2020 |
| Intervision Software Limited | Information & communication | 2011 |
| Intervoice AI Ltd | Information & communication | 2025 |
| Interweave Home Ltd | Manufacturing | 2026 |
| Intimate Beauty Clinic Limited | Health & social care | 2020 |
| Intinfra Limited | Professional & scientific | 2008 |
| Intlsolutions Limited | Wholesale & retail | 2025 |