| Instimatch Ltd | Financial services | 2020 |
| Instinct Financial LP | | 2016 |
| Instinctive Business Intelligence Ltd | Information & communication | 2016 |
| Instinctools Group LP | | 2015 |
| Institute for Research and Innovation in Social Services | Professional & scientific | 2006 |
| Institute of Auctioneers and Appraisers in Scotland. | Agriculture & fishing | 1926 |
| Institution of Fire Engineers (the) | Education | 1924 |
| Instrum Solucion Ltd | Wholesale & retail | 2026 |
| Insurcrush Limited | Real estate | 1967 |
| Insurepair (Glasgow) Limited | Professional & scientific | 1994 |
| Insurepair (Global) Limited | Construction | 2021 |
| Insurgent Studios Limited | Information & communication | 2005 |
| Insysbio UK Limited | Professional & scientific | 2018 |
| Insyt Ftbl Academy Ltd | Arts & recreation | 2026 |
| Insyt Ftbl Group Ltd | Financial services | 2026 |
| INT Trade & Steel Services LP | | 2021 |
| Intabulis LP | | 2014 |
| Intactness Ltd | Professional & scientific | 2023 |
| Intans Property Limited | Real estate | 2020 |
| Intay Trading LP | | 2019 |
| Intcom Ltd | Information & communication | 2013 |
| Intec Exports LP | | 2013 |
| Intec/Uniacor L.P. | | 2008 |
| Intech Agents L.P. | | 2012 |
| Intech Corporation L.P. | | 2010 |
| Intech EN LP | | 2015 |
| Intech Global L.P. | | 2013 |
| Intech Trade L.P. | | 2012 |
| Integra Compliance Limited | Professional & scientific | 2001 |
| Integra Creative LP | | 2016 |
| Integra Global Trade LP | | 2016 |
| Integral Express L.P. | | 2015 |
| Integrale Engineering Limited | Mining & quarrying | 2013 |
| Integrated Dentalcare Limited | Health & social care | 2012 |
| Integrated Estate Solutions Limited | Construction | 2025 |
| Integrated Geochemical Interpretation Limited | Professional & scientific | 1983 |
| Integration Club TL CIC | Education | 2024 |
| Integria LP | | 2025 |
| Integrity Bathroom Solutions Ltd | Wholesale & retail | 2019 |
| Integrity Finance & Mortgages Limited | Extraterritorial | 2021 |
| Integrity International Events Ltd. | Administrative & support | 2001 |
| Integrity Trade LP | | 2016 |
| Integro Group LP | | 2016 |
| Integron Systems LP | | 2016 |
| Integum Management L.P. | | 2018 |
| Intelcom Line LP | | 2016 |
| Inteldis Ltd | Professional & scientific | 2018 |
| Inteliqo Ltd. | Professional & scientific | 2018 |
| Intellect IT Services Limited | Information & communication | 2011 |
| Intelli Management LP | | 2016 |
| Intellia Ltd. | Information & communication | 2001 |
| Intellidigest Ltd | Administrative & support | 2016 |
| Intelligence Marketing LP | | 2019 |
| Intelligence UK Investigations Ltd | Professional & scientific | 2022 |
| Intelligent Artefacts Group Ltd | Information & communication | 2013 |
| Intelligent Global Health Ltd | Professional & scientific | 2016 |
| Intelligent GRC Limited | Information & communication | 2019 |
| Intelligent Heating and GAS Ltd | Construction | 2018 |
| Intelligent IG Limited | Administrative & support | 2015 |
| Intelligent Management Europe Ltd | Extraterritorial | 2012 |
| Intelligent Mobile Limited | Information & communication | 2004 |
| Intelligent Office Transcription Services Limited | Administrative & support | 2002 |
| Intelligent Office UK Limited | Information & communication | 1982 |
| Intelligent Repairs Limited | Administrative & support | 2020 |
| Intelligent Style LP | | 2016 |
| Intelligent Support Software Limited | Information & communication | 2014 |
| Intelux Group LP | | 2017 |
| Intense Business LP | | 2013 |
| Intentia Ltd | Professional & scientific | 2024 |
| Intentional IT Ltd | Information & communication | 2022 |
| Inter Advisory Services L.P. | | 2011 |
| Inter Beauty LP | | 2013 |
| Inter Capital Innovius LP | | 2017 |
| Inter Capital Mobile LP | | 2017 |
| Inter Challenge LP | | 2015 |
| Inter Cooperante Limited | Wholesale & retail | 2017 |
| Inter European Services & Associates | | 1993 |
| Inter Globe Consulting LP | | 2015 |
| Inter Route Logistics Limited | Extraterritorial | 2024 |
| Inter Scotia Ltd | Real estate | 2026 |
| Inter Style Alliance LP | | 2016 |
| Inter Textile Associates | | 1994 |
| Inter Trading Group LP | | 2015 |
| Inter Wood Trade LP | | 2015 |
| Inter-City Fitters Ltd | Manufacturing | 2026 |
| Inter-Connected Limited | Professional & scientific | 2014 |
| Inter-Craft Capital LP | | 2015 |
| Interactive One Corp LP | | 2014 |
| Interasset Management L.P. | | 2015 |
| Interbase Technology L.P. | | 2010 |
| Interberg Holdings L.P. | | 2018 |
| Interberg L.P. | | 2015 |
| Interbrand Consultant LP | | 2014 |
| Interbray Supreme LP | | 2017 |
| Intercap Group LP | | 2016 |
| Interchem Distribution Europe LP | | 2014 |
| Intercity Business Services L.P. | | 2008 |
| Intercity Clothing Limited | Real estate | 1991 |
| Intercity Global LP | | 2016 |
| Intercity L.P. | | 2015 |