| Idea Early LP | | 2016 |
| Idea LP | | 2019 |
| Idea Manufacturing Limited | Professional & scientific | 2019 |
| Ideal Concepts LP | | 2016 |
| Ideal Delight Limited | Manufacturing | 2025 |
| Ideal Electrical Solutions (UK) Limited | Construction | 2013 |
| Ideal Mini Mart Ltd | Wholesale & retail | 2026 |
| Ideal Tutors Ltd | Education | 2018 |
| Ideal Vape Shop Ltd | Wholesale & retail | 2026 |
| Idee Fixe Ecosse Ltd | Real estate | 2022 |
| Ideeaz Limited | Professional & scientific | 2003 |
| Ider Holdings Limited | Real estate | 1995 |
| Ider Investments Holdings Limited | Financial services | 2019 |
| Ider Property Holdings Limited | Real estate | 2016 |
| Ides LP | | 2015 |
| IDG Consulting Limited | Administrative & support | 2022 |
| IDH Yearling Grove Ltd | Construction | 2026 |
| IDI Tech Ventures LP | | 2016 |
| Idiome Invest LP | | 2017 |
| Idiome Marketing LP | | 2017 |
| IDK Global Logistics Ltd | Transport & logistics | 2022 |
| IDM (UK) Limited | Construction | 2005 |
| IDM Solutions Scotland Limited | Financial services | 2022 |
| IDN Group Limited | Information & communication | 2023 |
| Idra Trading Ltd | Hospitality | 2026 |
| Idrac Limited Partnership | | 2008 |
| Idria LP | | 2016 |
| Idris Healthcare Ltd | Professional & scientific | 2025 |
| IDS Data Services Limited | Professional & scientific | 2005 |
| Idtreo Ltd | Professional & scientific | 2023 |
| IE Engineering LP | | 2012 |
| IE Savage Ltd | Extraterritorial | 2012 |
| Iedp Ltd | Extraterritorial | 2011 |
| IEF International | Other services | 2009 |
| Ieid Ltd | Education | 2019 |
| IEM (Holdings) Ltd | Construction | 2019 |
| IEM3 Ltd | Construction | 2019 |
| Iepbs LP | | 2024 |
| Iero Limited | Real estate | 2024 |
| IES (Industry Engineering Solutions) Energy Limited | Administrative & support | 2011 |
| IF Scotland Limited | Professional & scientific | 2024 |
| IFA Ltd | Wholesale & retail | 2023 |
| Ifab (Scotland) Ltd | Manufacturing | 2015 |
| Ifam International Festival & Artists Management LP | | 2011 |
| Ifan Digital LP | | 2019 |
| Ifassi LP | | 2025 |
| IFC Initial GP Limited | Administrative & support | 2012 |
| Ifdnrg Ltd. | Information & communication | 2000 |
| IFE Capital Investment LP | | 2016 |
| Ifeel Labs LP | | 2015 |
| Ifield Pristine LP | | 2016 |
| Ifire UK. Limited | Administrative & support | 2011 |
| IFL Holdings Limited | Financial services | 2024 |
| IFM Fintech Participations GP LLP | | 2015 |
| IFM Fintech Participations II GP LLP | | 2018 |
| IFM Fintech Participations II LP | | 2018 |
| IFM Fintech Participations III GP LLP | | 2022 |
| IFM Fintech Participations III LP | | 2022 |
| IFM Fintech Participations LP | | 2015 |
| Iformis Limited | Information & communication | 2005 |
| Iftech Group LP | | 2017 |
| Ifversen Property Limited | Real estate | 2022 |
| IFW Legal Scots Law Limited | Professional & scientific | 2026 |
| IG4 Capital General Partner (Scotland) Limited | Administrative & support | 2020 |
| IG4 Capital Infrastructure Investments LP | | 2020 |
| IG4 Transport LP | | 2021 |
| IGA Media Ltd | Arts & recreation | 2022 |
| Igas Energy Production Limited | Mining & quarrying | 2006 |
| Igbn Group Ltd | Wholesale & retail | 2020 |
| Igboamaka Scotland C.I.C. | Education | 2022 |
| IGM Energy Ltd | Information & communication | 2020 |
| IGM Europe Limited | Professional & scientific | 2022 |
| IGM Investments 2024 Limited | Hospitality | 2024 |
| IGM Marketing Ltd | Professional & scientific | 2019 |
| IGM Ventures Ltd | Professional & scientific | 2017 |
| Ignis Artists Agency Ltd | Professional & scientific | 2026 |
| Ignis Media Ltd | Information & communication | 2018 |
| Ignite Tech Ltd | Information & communication | 2025 |
| Ignition Heating Services Ltd | Construction | 2023 |
| Ignition Marketing Limited | Administrative & support | 2005 |
| IGO Global Ltd | Wholesale & retail | 2025 |
| Igoe Hair Ltd. | Other services | 2020 |
| Iguazu Group LP | | 2016 |
| IH 42 Limited | Real estate | 2020 |
| IH Trading Ltd | Hospitality | 2026 |
| IHF Cyber Limited | Information & communication | 2019 |
| IHF Digital Limited | Information & communication | 2023 |
| IHF Futures Limited | Real estate | 2018 |
| IHF Limited | Professional & scientific | 2012 |
| IHJ Collection Limited | Other services | 1986 |
| IHO Private Limited | Hospitality | 2023 |
| IHP L.P. | | 2003 |
| IHS International LP | | 2023 |
| IHV SLP LP | | 2026 |
| II Aspire Limited | Professional & scientific | 2006 |
| Iibg Ltd | Professional & scientific | 2012 |
| IIF SLP GP Limited | Financial services | 2007 |
| IIF UK 1 Hedged LP | | 2018 |
| IIF UK 1 LP | | 2008 |
| Iindigochild Ltd | Information & communication | 2023 |