| Infinity Hair Design (Dundee) Limited | Other services | 2018 |
| Infinity Studios (Dundee) Ltd | Other services | 2026 |
| Inflow Media Group Limited | Professional & scientific | 2023 |
| Infocord L.P. | | 2014 |
| Infolux Universal L.P. | | 2015 |
| Informex L.P. | | 2015 |
| Informit Systems (Scotland) Ltd. | Information & communication | 2010 |
| Infotech Services Ltd | Information & communication | 2017 |
| Infrastructure HUT Ltd | Information & communication | 2019 |
| Inglis Property Ltd | Real estate | 2025 |
| Ingram Engineering Services Ltd | Construction | 2018 |
| Ingrido Marketing LP | | 2017 |
| Injury Shetland Ltd | Health & social care | 2014 |
| Inkrite Direct Limited | Wholesale & retail | 2019 |
| Inn House Bars Ltd | Wholesale & retail | 2025 |
| Inner Glow Advanced Aesthetics & Beauty Ltd | Health & social care | 2024 |
| Innersea Ltd | Manufacturing | 2025 |
| Innes Rattray Group Ltd | Real estate | 2026 |
| Innes Wealth and Mortgages Ltd | Financial services | 2022 |
| Innocent Health Ltd | Wholesale & retail | 2017 |
| INNOV8 Interiors Limited | Extraterritorial | 2000 |
| Innovare Associates Ltd | Information & communication | 2015 |
| Innovative Business Technologies LP | | 2010 |
| Innovatrax Limited | Professional & scientific | 2014 |
| INOV8 Consulting Ltd. | Information & communication | 2011 |
| Inside & OUT Cleaning Services Ltd | Administrative & support | 2025 |
| Insight Counselling | Health & social care | 2008 |
| Insights Business Holdings Ltd | Professional & scientific | 2017 |
| Insights Coaching Limited | Professional & scientific | 2000 |
| Insights Foundation | Other services | 2020 |
| Insights Learning & Development International (Emea) Limited | Professional & scientific | 2007 |
| Insights Learning & Development Limited | Professional & scientific | 1987 |
| Inspectserv Ltd | Professional & scientific | 2024 |
| Inspire Advisory Services L.P. | | 2014 |
| Installations by Chris M Knight Ltd | Construction | 2022 |
| Instaltec North Limited | Construction | 2020 |
| Insure Apps Technology Limited | Information & communication | 2017 |
| Intamap Limited | Information & communication | 1989 |
| Integrated Project & Compliance Solutions Ltd | Professional & scientific | 2025 |
| Integrity (Dundee) Ltd. | Real estate | 2006 |
| Integrity First Ltd. | Real estate | 2007 |
| Intelligence Finance Consultants Limited | Administrative & support | 2014 |
| Intelligent Mortgage Services Limited | Financial services | 2002 |
| Interactive Entertainment Scotland Limited | Other services | 2025 |
| Interamex L.P. | | 2012 |
| Interarmco LP | | 2016 |
| Intercue Limited | Information & communication | 2024 |
| Intergrated Limited | Health & social care | 2017 |
| Interlane Management L.P. | | 2015 |
| Interline Management L.P. | | 2013 |
| International Food Store Dundee Ltd | Wholesale & retail | 2024 |
| International Mobile Services LP | | 2016 |
| Interscot Transport Limited | Transport & logistics | 1992 |
| Intersoft Technology L.P. | | 2015 |
| Interstellar Learning Solutions Limited | Education | 2022 |
| Interstyle L.P. | | 2012 |
| Interval Coffee Stop Ltd | Hospitality | 2025 |
| Intervention Technologies Limited | Real estate | 2017 |
| Inveraldie Limited | Real estate | 2021 |
| Inveraldie Properties Limited | Real estate | 1992 |
| Inverarity Farms Limited | Agriculture & fishing | 1945 |
| Inverary Property Ltd | Real estate | 2022 |
| Inverblair Limited | Financial services | 1975 |
| Invercarse (Holdings) Limited | Administrative & support | 2013 |
| Invercarse Hotel Ltd | Financial services | 2021 |
| Invercarse Limited | Administrative & support | 2008 |
| Invergowrie Investments Limited | Real estate | 2016 |
| Invergowrie Taxis Limited | Transport & logistics | 2024 |
| Inverkeilor Estates Ltd | Real estate | 2014 |
| Inverlunan Ltd | Transport & logistics | 2026 |
| Inverness Caledonian Thistle Properties Limited | Real estate | 2000 |
| Inverness Caterham Hire Limited | Administrative & support | 2025 |
| Inversal UK Limited | Financial services | 2024 |
| Invertay Construction Ltd | Construction | 2020 |
| Invertay Consulting Ltd | Construction | 2024 |
| Invertay Developments Ltd | Real estate | 2014 |
| Invertay Homes Limited | Construction | 2013 |
| Investforum L.P. | | 2016 |
| Invicta Scotland Limited | Other services | 2016 |
| Invinceus Group Ltd | Mining & quarrying | 2013 |
| Invinceus International Ltd | Mining & quarrying | 2013 |
| Invinceus Ltd | Mining & quarrying | 2013 |
| Invotek Ltd | Information & communication | 2023 |
| Ioia Limited | Wholesale & retail | 2025 |
| ION Electrical (Scotland) Limited | Other services | 2017 |
| ION8 Limited | Extraterritorial | 2018 |
| Ipcon Limited | Construction | 2016 |
| Iperc (UK) Ltd | Education | 2021 |
| IQR Worldwide L.P. | | 2013 |
| IQW Ltd | Wholesale & retail | 2026 |
| IR18 Limited | Construction | 2021 |
| Ireland Aviation Ltd | Professional & scientific | 2024 |
| Irish Legal News Ltd | Information & communication | 2015 |
| IRN Smith Ltd | Hospitality | 2025 |
| Iron Ocean Limited | Manufacturing | 2015 |
| Iron-Lead Industrial Services Ltd | Water & waste | 2026 |
| Irons Glazing and Balustrades Limited | Construction | 2023 |
| Irons Occupational Health Consulting Ltd | Professional & scientific | 2020 |
| Irvite Commerce LP | | 2015 |
| IS Consult Ltd | Professional & scientific | 2018 |