| Inflectiv Intelligence Ltd | Professional & scientific | 2021 |
| Inflowcontrol UK Limited | Wholesale & retail | 2020 |
| Infor-Tech Limited | Wholesale & retail | 2016 |
| Informatics Analysis Ltd | Information & communication | 2024 |
| Infraforge Solutions Limited | Construction | 2024 |
| Infraxpert Tech Ltd | Information & communication | 2025 |
| Inga Property Limited | Real estate | 2022 |
| Ingasetter Limited | Wholesale & retail | 1946 |
| Ingenious Systems Ltd | Wholesale & retail | 2025 |
| Ingenium Business Advisory Limited | Professional & scientific | 2019 |
| Ingenium Virtual Assistant Limited | Other services | 2025 |
| Ingu Highland Ltd | Manufacturing | 2023 |
| Inicio-Fresco Limited | Agriculture & fishing | 2013 |
| Initium Novum Ltd | Hospitality | 2024 |
| Injekt Aesthetics Ltd | Wholesale & retail | 2025 |
| Injus Homes Ltd | Real estate | 2018 |
| Inkedge Limited | Other services | 2025 |
| Inmd Ltd | Financial services | 2024 |
| Innacircle Limited | Professional & scientific | 2024 |
| Inner Dowsing Wind Farm Limited | Energy | 2000 |
| Inner Healing Club Ltd | Professional & scientific | 2025 |
| Innervate Engineering Ltd | Professional & scientific | 2022 |
| Innosea Limited | Professional & scientific | 2014 |
| Innosport Ltd | Information & communication | 2024 |
| Innova Drilling and Intervention Limited | Mining & quarrying | 2011 |
| Innovair Limited | Professional & scientific | 2015 |
| Innovat Buynest Ltd | Wholesale & retail | 2024 |
| Innovata Biomed Limited | Health & social care | 1985 |
| Innovative Drilling Systems Ltd. | Administrative & support | 2015 |
| Innovex (International) UK Holdco Limited | Financial services | 2017 |
| Innovex International (Europe) Limited | Manufacturing | 1983 |
| Innovex UK Canada Holdco Limited | Financial services | 2023 |
| Innovo Engineering and Construction Limited | Manufacturing | 2012 |
| Innovo Ltd Ltd | Manufacturing | 2026 |
| Innseagan House Hotel Limited | Hospitality | 2001 |
| Inoapps Limited | Information & communication | 2005 |
| Inpulso Ltd | Real estate | 2018 |
| Input Output Creative Ltd | Construction | 2024 |
| INS Aberdeen Ltd. | Professional & scientific | 2013 |
| Insch Bnbs Ltd | Real estate | 2024 |
| Inscot Ltd | Wholesale & retail | 2025 |
| Inscot Properties Limited | Real estate | 2026 |
| Inscotia Ltd | Information & communication | 2025 |
| Insight (UK) Limited | Other services | 1997 |
| Insol Engineering Services Ltd | Professional & scientific | 2024 |
| Inspect System Ltd | Professional & scientific | 2024 |
| Inspirati Property Managers Ltd | Real estate | 2023 |
| Inspire Alliance Ltd | Professional & scientific | 2018 |
| Inspire Change Solutions Ltd | Professional & scientific | 2024 |
| Inspire Signs & Graphics Limited | Professional & scientific | 2014 |
| Installation & Maintenance Services (Aberdeen) Limited | Construction | 2012 |
| Instant Neighbour Aberdeen | Health & social care | 1996 |
| Instock Ltd | Wholesale & retail | 1974 |
| Instrument Engineering Solutions Limited | Professional & scientific | 2007 |
| Instrumental Engineering Ltd. | Professional & scientific | 2008 |
| Instrusafe Solutions Limited | Professional & scientific | 2025 |
| Insulate and Renovate Ltd | Manufacturing | 2023 |
| Intebloc Ltd | Manufacturing | 2017 |
| Integra Happy Homes Ltd | Real estate | 2024 |
| Integra Well Solutions Limited | Mining & quarrying | 2018 |
| Integrated Planning Limited | Professional & scientific | 2012 |
| Integrated Project Solutions Group Limited | Manufacturing | 2017 |
| Integrated Services (Intl) Limited | Mining & quarrying | 1997 |
| Integritai Ltd | Professional & scientific | 2026 |
| Integritie Ledger Advisory Ltd | Professional & scientific | 2026 |
| Integrity ISS Limited | Professional & scientific | 2017 |
| Integrity Link Services Ltd | Professional & scientific | 2012 |
| Integrity Plant Services Ltd | Professional & scientific | 2018 |
| Integrity XL Limited | Wholesale & retail | 2010 |
| Intelligence With Data Limited | Information & communication | 2024 |
| Intelligent Frame Ltd | Information & communication | 2022 |
| Intelligent Gels Limited | Professional & scientific | 2009 |
| Intelligent Plant Limited | Information & communication | 2006 |
| Intelligent Solutions Engineering Ltd | Professional & scientific | 2017 |
| Intellineering Ltd | Professional & scientific | 2019 |
| Intep Ltd | Professional & scientific | 2024 |
| Inter City (Aberdeen) Limited | Real estate | 1994 |
| Inter Stone LP | | 2012 |
| Interactive Health Limited | Health & social care | 2014 |
| Interactive Petrophysics Ltd. | Mining & quarrying | 1998 |
| Interactive Print Ltd | Financial services | 2017 |
| Interactyx Limited | Information & communication | 1995 |
| Intercon UK Offshore Services Ltd | Administrative & support | 2025 |
| Interec Limited | Professional & scientific | 2016 |
| Intereduconnect Ltd | Education | 2026 |
| Interface Engineering Solutions Ltd | Professional & scientific | 2007 |
| Interkiln Engineering Limited | Professional & scientific | 2013 |
| Intermara Marine Limited | Mining & quarrying | 2023 |
| Intermoor Limited | Other services | 1996 |
| International Business Technology Ltd | Wholesale & retail | 2020 |
| International Doors and Windows Employee Trust Limited | Professional & scientific | 2022 |
| International Doors and Windows Limited | Wholesale & retail | 2006 |
| International Energy Services Ltd | Professional & scientific | 2022 |
| International Medical Management Inc. Limited | Health & social care | 2004 |
| International Rope Access Solutions Ltd | Construction | 2026 |
| International Subsea Services Limited | Professional & scientific | 2022 |
| International Tubular Services Limited | Mining & quarrying | 1988 |
| Internet for Business Limited | Information & communication | 2025 |
| Interocean Energy (Middle East) Limited | Professional & scientific | 2025 |
| Interocean Group Services Limited | Financial services | 2014 |